CN103580779B - Channel quality instruction information reporting and determining method and equipment - Google Patents

Channel quality instruction information reporting and determining method and equipment Download PDF

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Publication number
CN103580779B
CN103580779B CN201210254684.9A CN201210254684A CN103580779B CN 103580779 B CN103580779 B CN 103580779B CN 201210254684 A CN201210254684 A CN 201210254684A CN 103580779 B CN103580779 B CN 103580779B
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channel state
state information
cqi
information process
differential cqi
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CN103580779A (en
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倪浩
高秋彬
彭莹
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a channel quality instruction CQI information reporting and determining method and equipment for multipoint cooperation transmission and relates to the field of wireless communication, and the channel quality instruction CQI information reporting and determining method and equipment for multipoint cooperation transmission are used for saving the resources needed by reporting the CQI information. According to the method, a network side configures a plurality of channel state information processes for a user terminal, and configures difference CQI reference information for each channel state information process, the user terminal determines the difference CQI information corresponding to the channel state information processes according to the difference CQI reference information corresponding to the channel state information processes, carries the difference CQI information in the channel state information and reports the difference CQI information to the network side, and the network side determines the CQI information corresponding to the channel state information processes according to the difference CQI information corresponding to the channel state information processes and the difference CQI reference information corresponding to the channel state information processes. The channel quality instruction CQI information reporting and determining method and equipment for multipoint cooperation transmission can save system resources.

Description

Method and equipment for reporting and determining channel quality indication information
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for reporting and determining channel quality indicator information.
Background
In a long term evolution-advanced (LTE-a) system, in order to reduce the interference of neighboring cells of a cell coverage edge user terminal (UE) and improve the experience of the cell edge user terminal, a coordinated multipoint transmission (CoMP) technology is used. The coordinated multipoint transmission technique is a cooperation between a plurality of Transmission Points (TPs) separated in geographical positions. Generally, the multiple transmission points refer to base stations of different cells, or a base station of one cell and multiple Remote Radio Heads (RRHs) controlled by the base station. The coordinated multi-point transmission technology can be divided into downlink coordinated transmission and uplink joint reception. Downlink coordinated multipoint transmission is mainly divided into two transmission schemes: coordinated scheduling/precoding (CS/CB) and Joint Processing (JP). One transmission point in a plurality of transmission points in CS/CB transmission sends a useful signal to a user terminal, and other transmission points reduce the interference to the user terminal as much as possible through joint scheduling and beam forming. The joint processing scheme can be further divided into Joint Transmission (JT) and Dynamic Point Selection (DPS). Multiple transmission points in JT transmission transmit useful signals to the user terminal simultaneously, thereby enhancing the received signal at the user terminal. The DPS transmission dynamically switches the transmission points of the user terminals, and always selects the point optimal for the user terminal from the cooperative transmission points to transmit the user terminal signal. These coordinated multipoint transmission schemes may be used in conjunction with each other. It is also possible to dynamically set some transmission points not to transmit signals on some time-frequency resources in combination with a dynamic muting (DB) scheme.
To support coordinated multipoint transmission, the network configures one or more downlink reference signal resources for channel measurement, such as non-zero power channel state information-reference signal (NZP CSI-RS) resources. The user terminal measures the reference signal resource by using the downlink channel configured by the network, and can measure the downlink channel of each transmission point. The network may also configure one or more Interference Measurement Resource (IMR) resources for interference measurement according to the supported CoMP transmission scheme, and the ue may measure interference under one or more interference hypotheses by using the interference measurement downlink reference signals. A channel state information process is defined, corresponding to a channel state information reference signal resource and an interference hypothesis configured by the network. The user terminal may obtain Channel state information of each transmission point under one or more interference hypotheses, including Channel Quality Indicator (CQI), according to the measured downlink Channel of each transmission point and the interference under each interference hypothesis. An example of the calculation of CQI is:
CQI k , m , n = Q ( P k , m I k , n ) ;
wherein the CQIk,m,nRepresenting NZP over frequency band kCQI serial number, P, of CSI-RS resource m under interference hypothesis nk,mRepresents the downlink signal power measured by the user terminal on the frequency band k by using NZP CSI-RS resource m, Ik,nThe interference power of an interference hypothesis n measured by a user terminal on a frequency band k is shown, Q (-) is a CQI quantization function, and the frequency band k may be the whole system frequency band or a certain sub-band of the system frequency band. It should be noted that, in the above process, each transmission point corresponds to one reference signal resource, which may include one or more physical transmission points; each interference hypothesis corresponds to one interference measurement reference signal resource. Taking the example of the network configuring 3 transmission points for the UE, table 1 below gives possible signal and interference assumptions for CQI.
TABLE 1
As shown in table 1, compared to the conventional single cell transmission, the ue only needs to report the channel state information of one point, and the coordinated multi-point transmission may need to report the channel state information under multiple transmission signal hypotheses and interference hypotheses. The reporting overhead is correspondingly much larger than that of single-cell transmission. Although the network may configure only a part of downlink reference signal resources and IMR pairs (hereinafter referred to as resource pairs) for the ue according to the supported transmission scheme, and the ue only reports channel state information of the resource pairs configured by the network, the reporting overhead of coordinated multi-point transmission still increases significantly compared to single-cell transmission.
The channel state information is reported in a periodic reporting mode based on a Physical Uplink Control Channel (PUCCH) or an aperiodic reporting mode based on a Physical Uplink Shared Channel (PUSCH). The network configures a channel state information reporting mode for each channel state information. Different reporting modes may be configured for different channel state information, and the channel state information is reported in the different reporting modes. Different channel state information may also be configured with the same reporting mode, and the channel state information configured with the same reporting mode is reported in the same reporting mode. The periodic reporting based on the PUCCH comprises a reporting mode 1-0, a reporting mode 1-1, a reporting mode 2-0 and a reporting mode 2-1. The reporting mode 1-1 further includes a sub-mode 1 and a sub-mode 2, which are used for reporting the channel state information of the antenna port of the base station 8 in the transmission mode 9. The reporting modes include reporting types 1, 1a, 2a, 2b, 2c, 3, 4, 5, and 6, and are used for reporting CQI, Precoding Matrix Indicator (PMI)/Rank Indicator (RI), Precoding Type Indicator (PTI), and other reporting information. The aperiodic channel information report based on the PUSCH comprises a reporting mode 1-2, a reporting mode 2-2, a reporting mode 3-0 and a reporting mode 3-1.
In order to reduce the reporting overhead, in the reporting of the channel state information transmitted by a single cell, the sub-band differential CQI reporting is adopted in a reporting mode of partial non-periodic reporting. For example, in the reporting mode 3-1 of the aperiodic report, the 2-bit sub-band differential CQI of each code word is the difference between the sub-band CQI serial number and the broadband CQI serial number of the corresponding code word; in the reporting mode 2-2 of the aperiodic report, the 2-bit differential CQI of the M sub-bands selected by the user of each code word is the difference between the CQI serial number of the M sub-bands selected by the user and the broadband CQI serial number of the corresponding code word.
And reporting the 2 nd code word in the reporting mode of the partial period by adopting the spatial differential CQI. For example, in the reporting mode 1-1 of periodic reporting, when reporting a wideband CQI/PMI for a transmission mode other than the transmission mode 9 of 8 CSI-RS ports, or when reporting a wideband CQI/2 nd PMI for the transmission mode 9 of 8 CSI-RS ports, or when reporting a wideband CQI/1 st PMI for the transmission mode 9 of 8 CSI-RS ports, if RI >1, a 3-bit wideband spatial differential CQI of a 2 nd codeword is a difference between a wideband CQI sequence number of the 1 st codeword and a wideband CQI sequence number of the 2 nd codeword; in a reporting mode 2-1 of periodic reporting, when reporting a wideband CQI/PMI for a transmission mode other than a transmission mode 9 of 8 CSI-RS ports, or when reporting a wideband CQI/2 nd PMI for the transmission mode 9 of 8 CSI-RS ports and a PTI reported last time is 1, or when reporting a wideband CQI/2 nd PMI for the transmission mode 9 of 8 CSI-RS ports and a PTI reported last time is 0, if RI >1, a 3-bit wideband spatial differential CQI of a 2 nd codeword is a difference between a wideband CQI sequence number of the 1 st codeword and a wideband CQI sequence number of the 2 nd codeword; in the reporting mode 2-1 of periodic reporting, when reporting the CQI of the subband selected by the user terminal for a transmission mode other than the transmission mode 9 of 8 CSI-RS ports, or reporting the CQI of the subband/2 nd PMI for the transmission mode 9 of 8 CSI-RS ports and when the latest reported PTI is 1, if RI >1, the 3-bit subband spatial differential CQI of the 2 nd codeword is the difference between the subband CQI number of the 1 st codeword and the subband CQI number of the 2 nd codeword.
A differential CQI reporting method in single-cell transmission is a method for calculating and reporting a difference value between CQI serial numbers based on the correlation of reporting of a sub-band and a broadband CQI of the same transmission point or the correlation of reporting of the CQI of different code words of the same transmission point. Because the differential CQI can be reported by adopting fewer bit numbers, the reporting overhead is reduced. The differential CQI reporting method can also be used for channel state information reporting of coordinated multi-point transmission. However, the reporting overhead of coordinated multi-point transmission is significantly increased compared to that of single-cell transmission, and only the correlation between CQI reports in one transmission point is used for CQI differential reporting, which can only achieve differential reporting of partial CQI of one transmission point, such as differential reporting of sub-band CQI or differential reporting of second codeword CQI. The method has a limited effect of saving the reporting overhead for the coordinated multi-point transmission.
It can be seen that the existing differential CQI reporting method is based on the correlation between the sub-band CQI and the wideband CQI reporting of the same transmission point, or based on the correlation between the CQI reporting of different codewords of the same transmission point. Only the differential reporting of partial CQI of one transmission point can be realized, and the effect of saving the reporting overhead is limited for the multi-point cooperative transmission.
Disclosure of Invention
The embodiment of the invention provides a CQI information reporting and determining method and equipment for coordinated multipoint transmission, which are used for saving resources required by reporting CQI information.
A method for reporting Channel Quality Indicator (CQI) information for coordinated multi-point transmission comprises the following steps:
a user terminal receives reference signal configuration information of a plurality of channel state information processes sent by a network side, information of a feedback mode corresponding to each channel state information process and differential Channel Quality Indication (CQI) reference information corresponding to each channel state information process, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
the user terminal determines the channel state information process needing to adopt the differential CQI to report in the plurality of channel state information processes, and for each determined channel state information process, the differential CQI information corresponding to the channel state information process is determined according to the reference signal configuration information of the channel state information process and the differential CQI reference information corresponding to the channel state information process;
and the user terminal reports the channel state information to the network side according to the feedback mode corresponding to each channel state information process, wherein the channel state information comprises the determined differential CQI information.
A method for determining channel quality indication, CQI, information for coordinated multipoint transmission, the method comprising:
the method comprises the steps that a network side issues reference signal configuration information of a plurality of channel state information processes, information of a feedback mode corresponding to each channel state information process and differential CQI reference information corresponding to each channel state information process to a user terminal, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
a network side receives channel state information reported by a user terminal, wherein the channel state information comprises differential CQI information corresponding to a channel state information process reported by adopting differential CQI;
and the network side determines the CQI information corresponding to each channel state information process reported by adopting the differential CQI according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process.
A user terminal, the user terminal comprising:
a receiving unit, configured to receive reference signal configuration information of multiple channel state information processes issued by a network side, information of a feedback mode corresponding to each channel state information process, and differential Channel Quality Indicator (CQI) reference information corresponding to each channel state information process, where each differential CQI reference information is information associated with one channel state information process in the multiple channel state information processes;
a determining unit, configured to determine a channel state information process that needs to be reported by using a differential CQI in the multiple channel state information processes, and for each determined channel state information process, determine differential CQI information corresponding to the channel state information process according to reference signal configuration information of the channel state information process and differential CQI reference information corresponding to the channel state information process;
and the feedback unit is used for reporting the channel state information to the network side according to the feedback mode corresponding to each channel state information process, wherein the channel state information comprises the determined differential CQI information.
A base station, the base station comprising:
a sending unit, configured to send reference signal configuration information of a plurality of channel state information processes, information of a feedback mode corresponding to each channel state information process, and differential CQI reference information corresponding to each channel state information process to a user terminal, where each differential CQI reference information is information associated with one channel state information process of the plurality of channel state information processes;
a receiving unit, configured to receive channel state information reported by a user terminal, where the channel state information includes differential CQI information corresponding to a channel state information process reported by using a differential CQI;
and the determining unit is used for determining the CQI information corresponding to each channel state information process reported by adopting the differential CQI according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process.
In the scheme provided by the embodiment of the invention, a network side configures a plurality of channel state information processes for a user terminal, and configures differential CQI reference information for each channel state information process, the user terminal determines differential CQI information corresponding to the channel state information process according to the differential CQI reference information corresponding to the channel state information process, carries the differential CQI information in the channel state information and reports the differential CQI information to the network side, and the network side determines the CQI information corresponding to the channel state information process according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process. Because the bit number occupied by the differential CQI information is less than that occupied by the non-differential CQI information, the resource overhead required for reporting the differential CQI information is low, and system resources are saved.
Drawings
FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another method provided by the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.
Detailed Description
In the coordinated multipoint transmission, the CQI reporting of a plurality of channel state information processes also has relevance. For example, CQI1, CQI2, CQI3, and CQI4 in table 1 have the same signal assumption, where CQI3 includes interference of TP2 and TP3, and CQI1 includes interference of TP2 and does not include interference of TP 3; the interference that CQI2 does not include TP2 includes the interference of TP 3; the CQI4 does not include interference of TP2 and TP 3. Without loss of generality, it may be assumed that the TP2 interference power is stronger for the user terminal than the TP3 interference power. However, the difference between the interference power of TP2 and TP3 is limited by the transmission point selection threshold in the measurement set. Meanwhile, since TP3 is the point of the measurement set where the interference is the weakest, the interference of TP3 accounts for a smaller proportion of the total interference. Therefore, the correlation between CQI3 and CQI1, between CQI1 and CQI2, and between CQI2 and CQI4 are high. The invention provides a channel state information reporting method for coordinated multi-point transmission and a determination method of CQI information according to the relevance of CQI reporting of a plurality of channel state information processes in coordinated multi-point transmission.
Referring to fig. 1, a CQI information reporting method for coordinated multipoint transmission at a terminal side according to an embodiment of the present invention includes the following steps:
step 10: a user terminal receives reference signal configuration information of a plurality of channel state information processes issued by a network side, information of a feedback mode corresponding to each channel state information process and differential CQI reference information corresponding to each channel state information process, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
here, each csi process is a process corresponding to one csi reference signal resource and one interference hypothesis for one transmission point, and, correspondingly,the reference signal configuration information of each channel state information process includes resource information used by a corresponding transmission point to send a downlink reference signal (such as NZP CSI-RS) for channel measurement, i.e., a downlink channel measurement reference signal, to the user terminal, and resource information used by a corresponding transmission point to send a downlink reference signal for interference measurement, i.e., an interference measurement downlink reference signal, to the user terminal. The user terminal can perform channel measurement and calculation on the resource indicated by the resource information used for sending the downlink channel measurement reference signal to obtain the downlink signal power, and the user terminal can perform interference measurement and calculation on the resource indicated by the resource information used for sending the interference measurement downlink reference signal to obtain the interference power, and further according to the formula of the background technology partAnd calculating to obtain the CQI serial number corresponding to the channel state information process.
Step 11: the user terminal determines a channel state information process needing to adopt differential CQI to report in a plurality of channel state information processes, and for each determined channel state information process, determines differential CQI information corresponding to the channel state information process according to reference signal configuration information of the channel state information process and differential CQI reference information corresponding to the channel state information process, wherein the differential CQI information is CQI corresponding to the channel state information process and offset of the CQI corresponding to the channel state information process related to the differential CQI reference information corresponding to the channel state information process;
step 12: and the user terminal reports the channel state information to the network side according to the feedback mode corresponding to each channel state information process, wherein the channel state information comprises the determined differential CQI information.
Specifically, in step 11, the user terminal determines a channel state information process that needs to be reported by using a differential CQI in a plurality of channel state information processes, and the specific implementation may be as follows: the user terminal judges whether the channel state information process a and the channel state information process b associated with the differential CQI reference information corresponding to the channel state information process are the same process or not for each channel state information process a in a plurality of channel state information processes, if so, the channel state information process a is determined not to be the channel state information process needing adopting differential CQI for reporting, otherwise, the channel state information process a is determined to be the channel state information process needing adopting differential CQI for reporting.
Specifically, the differential CQI information corresponding to the channel state information process is determined according to the reference signal configuration information of the channel state information process and the differential CQI reference information corresponding to the channel state information process, and the specific implementation may be as follows:
setting the number of the channel state information process as i, and the number of the channel state information process related to the differential CQI reference information corresponding to the channel state information process i as j;
determining a CQI serial number corresponding to the channel state information process i according to the reference signal configuration information of the channel state information process i, and determining a CQI serial number corresponding to the channel state information process j according to the reference signal configuration information of the channel state information process j;
and determining the differential CQI information corresponding to the channel state information process i according to the CQI serial number corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j.
Specifically, the differential CQI information corresponding to the channel state information process i is determined according to the CQI number corresponding to the channel state information process i and the CQI number corresponding to the channel state information process j, and the specific implementation may be as follows:
if the RI of the channel state information process i is the same as that of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula one:
the formula I is as follows: wideband differential CQI information of codeword c of csi process i-wideband CQI index of codeword c of csi process j-wideband CQI index of codeword c of csi process i, where c is in {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula II:
the formula II is as follows: wideband differential CQI information for codeword c of csi process i-wideband CQI index number for codeword 0 of csi process j-wideband CQI index number for codeword c of csi process i, where c is e {0,1 }.
Further, when the RI of the channel state information process i is the same as the RI of the channel state information process j, if the sub-band CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the sub-band differential CQI information of the channel state information process i is determined according to the following formula three:
the formula III is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword c of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
Further, when the RI of the channel state information process i is different from the RI of the channel state information process j, if the sub-band CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the sub-band differential CQI information of the channel state information process i is determined according to the following formula:
the formula four is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword 0 of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
In step 11, for the csi processes that do not need to use the CQI report, the ue calculates CQI information corresponding to the csi processes according to the feedback mode corresponding to the csi processes in the prior art. Correspondingly, the channel state information reported by the user terminal to the network side in step 12 includes CQI information corresponding to each channel state information process of the multiple channel state information processes, where for a channel state information process that needs to be reported by using differential CQI, the reported channel state information includes differential CQI information corresponding to the corresponding channel state information process determined in step 11, and for a channel state information process that does not need to be reported by using differential CQI, the reported channel state information includes CQI information corresponding to the corresponding channel state information process calculated according to the prior art. Of course, the reported channel state information may also include information such as PMI, RI, and the like.
In the method, each differential CQI reference information is an index of one channel state information process in a plurality of channel state information processes or an index of a feedback mode corresponding to the channel state information process.
Referring to fig. 2, a method for determining CQI information for coordinated multipoint transmission on a network side according to an embodiment of the present invention includes the following steps:
step 20: the method comprises the steps that a network side issues reference signal configuration information of a plurality of channel state information processes, information of a feedback mode corresponding to each channel state information process and differential CQI reference information corresponding to each channel state information process to a user terminal, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
here, for the channel state information process i needing to adopt the differential CQI for reporting, the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i issued by the network side is not the same process as the channel state information process i; for the channel state information process i which does not need to adopt the differential CQI report, the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i issued by the network side and the channel state information process i are the same process.
Step 21: a network side receives channel state information reported by a user terminal, wherein the channel state information comprises differential CQI information corresponding to a channel state information process reported by adopting differential CQI in a plurality of channel state information processes; certainly, the CQI information corresponding to the channel state information process that does not adopt differential CQI reporting is also included;
step 22: and the network side determines the CQI information corresponding to each channel state information process reported by adopting the differential CQI according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process.
Specifically, in step 22, the network side determines CQI information corresponding to the channel state information process according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process, and the specific implementation may be as follows:
setting the number of the channel state information process as i, and the number of the channel state information process related to the differential CQI reference information corresponding to the channel state information process i as j;
and determining the CQI information corresponding to the channel state information process i according to the differential CQI information corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i.
Specifically, the CQI information corresponding to the channel state information process i is determined according to the differential CQI information corresponding to the channel state information process i and the CQI number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i, and the specific implementation may be as follows:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula five:
the formula five is as follows: the wideband CQI index of the codeword c of the csi process i ═ the wideband CQI index of the codeword c of the csi process j — the wideband differential CQI of the codeword c of the csi process i, where c belongs to {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula six:
formula six: wideband CQI index of codeword c of csi process i-wideband CQI index of codeword 0 of csi process j-wideband differential CQI of codeword c of csi process i, where c is e {0,1 }.
Further, when the RI of the csi process i is the same as the RI of the csi process j, if the reported csi includes the subband differential CQI of the csi process i, the subband CQI number of the csi process i is determined according to the following formula:
the formula seven: sub-band CQI index of codeword c of csi process i-wideband CQI index of codeword c of csi process j-sub-band differential CQI of codeword c of csi process i, where c is ∈ {0,1 }.
Further, when the RI of the csi process i is different from the RI of the csi process j, if the reported csi includes the subband differential CQI of the csi process i, the subband CQI number of the csi process i is determined according to the following formula eight:
the formula eight: the subband CQI index of codeword c of csi process i ═ the wideband CQI index of codeword 0 of csi process j — the subband differential CQI of codeword c of csi process i, where c ∈ {0,1 }.
In step 22, for the CQI information corresponding to the channel state information process that is not reported using the differential CQI and included in the received channel state information, the network side determines, according to the prior art, the CQI information corresponding to the channel state information process according to the feedback mode corresponding to the channel state information process.
In the method, each differential CQI reference information is an index of one channel state information process in a plurality of channel state information processes or an index of a feedback mode corresponding to the channel state information process.
The execution subject of the method can be any network side equipment such as a transmission point of a base station or a terminal.
Example (b):
assuming that there are 3 transmission points TP1, TP2, TP3 in the measurement set of a certain ue, 3 channel state information processes need to be configured to the ue;
the method comprises the following steps: the network sends the reference signal configuration information of each channel state information process, the information of the feedback mode corresponding to each channel state information process and the differential CQI reference information corresponding to each channel state information process to the user terminal;
the specific information sent down is shown in table 2:
TABLE 2
Step two: after receiving information issued by a network side, a user terminal measures and calculates channels and interference according to reference signal configuration information of each channel state information process to obtain a CQI serial number corresponding to the corresponding channel state information process; determining a channel state information process needing to adopt differential CQI to report, and determining differential CQI information corresponding to each determined channel state information process according to a CQI serial number corresponding to the channel state information process and a CQI serial number corresponding to a channel state information process related to differential CQI reference information corresponding to the channel state information process; the method comprises the following specific steps:
the rank of the channel state information process 1 of the user terminal is 1, and the rank of the channel state information process 2 depends on the rank of the channel state information process 1, so the rank of the channel state information process 2 is also 1. The rank of the channel state information process 3 is 2;
the user terminal checks the differential CQI reference information of the channel state information process 1, which is the channel state information process index 1 and is the same as the channel state information process index 1 of the current channel state information process 1, and the differential CQI information of the channel state information process 1 does not need to be calculated according to the method of the invention.
The user terminal checks the differential CQI reference information of the channel state information process 2 as a channel state information process index 1, which is different from the channel state information process index 2 of the current channel state information process 2. The rank of the channel state information process 2 is the same as that of the channel state information process 1, and is 1, and the user terminal calculates the differential CQI information of the codeword 0 of the channel state information process 2 according to the wideband CQI number of the codeword 0 of the channel state information process 1, as follows:
wideband differential CQI information of codeword 0 of channel state information process 2-wideband CQI sequence number of codeword 0 of channel state information 1-wideband CQI sequence number of codeword 0 of channel state information 2;
if the sub-band CQI information of the channel state information process 2 needs to be reported is determined according to the feedback mode corresponding to the channel state information process 2, the sub-band differential CQI information of the channel state information process 2 is calculated according to the following mode:
the subband differential CQI information of codeword 0 of csi process 2 is the wideband CQI index of codeword 0 of csi process 1 — the subband CQI index of codeword 0 of csi process 2;
the user terminal checks the differential CQI reference information of the channel state information process 3 as a channel state information process index 2, which is different from the channel state information process index 3 of the current channel state information process 3. The rank of the channel state information process 3 is 2, and different from the channel state information process 2, the user terminal calculates the wideband differential CQI information of the channel state information process 3 according to the wideband CQI number of the codeword 0 of the channel state information process 2, as follows:
wideband differential CQI information of codeword 0 of channel state information process 3-wideband CQI sequence number of codeword 0 of channel state information process 2-wideband CQI sequence number of codeword 0 of channel state information process 3;
wideband differential CQI information of codeword 1 of channel state information process 3-wideband CQI sequence number of codeword 0 of channel state information process 2-wideband CQI sequence number of codeword 1 of channel state information process 3;
if the sub-band CQI information of the channel state information process 3 needs to be reported is determined according to the feedback mode corresponding to the channel state information process 3, the sub-band differential CQI information of the channel state information process 3 is calculated according to the following mode:
the subband differential CQI information of codeword 0 of csi process 3 is the wideband CQI index of codeword 0 of csi process 2 — the subband CQI index of codeword 0 of csi process 3;
the subband differential CQI of codeword 1 of csi process 3 is the wideband CQI index of codeword 0 of csi process 2 — the subband CQI index of codeword 1 of csi process 3;
step three: reporting channel state information to a network side according to a feedback mode corresponding to each channel state information process, wherein the channel state information comprises determined differential CQI information, specifically comprising CQI information corresponding to a channel state information process 1, differential CQI information corresponding to a channel state information process 2 and differential CQI information corresponding to a channel state information process 3, and the following is realized:
and the user terminal uses the differential CQI information corresponding to the channel state information process 2 to replace the CQI serial number in the channel state information process 2 and reports according to the reporting mode configured by the network. The user terminal uses the differential CQI information of the channel state information process 3 to replace the CQI serial number in the channel state information of the channel state information process 3, and reports according to the reporting mode configured by the network.
Step four: a network side receives channel state information reported by a user terminal, wherein the channel state information comprises differential CQI information corresponding to a channel state information process reported by adopting differential CQI; for each differential CQI information corresponding to the channel state information process reported by adopting the differential CQI, the CQI information corresponding to the channel state information process is determined according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process, and the method specifically comprises the following steps:
the channel state information reported by the user terminal received by the network side includes the CQI serial number corresponding to the channel state information process 1, the differential CQI information corresponding to the channel state information process 2 and the differential CQI information corresponding to the channel state information process 3, and the CQI information corresponding to the channel state information process 2 and the channel state information process 3 is calculated according to the differential CQI reference information.
The network side firstly calculates the wideband of the code word 0 of the channel state information process 2 according to the wideband CQI serial number of the code word 0 of the channel state information process 1:
the wideband CQI number of codeword 0 of csi process 2 is the wideband CQI number of codeword 0 of csi process 1 — the wideband differential CQI information of codeword 0 of csi process 2;
if the reported channel state information contains the sub-band differential CQI information of the channel state information process 2, determining the sub-band CQI information of the channel state information process 2 according to the following mode:
the sub-band CQI number of codeword 0 of channel state information process 2 is equal to the wideband CQI number of codeword 0 of channel state information process 1-the sub-band differential CQI information of codeword 0 of channel state information process 2;
the network side calculates the wideband CQI or sub-band CQI information of the channel state information process 3 according to the calculated wideband CQI serial number of the code word 0 of the channel state information process 2:
the wideband CQI number of codeword 0 of csi process 3 equals the wideband CQI number of codeword 0 of csi process 2 — the wideband differential CQI information of codeword 0 of csi process 3;
the wideband CQI number of codeword 1 of channel state information process 3 is equal to the wideband CQI number of codeword 0 of channel state information process 2-the wideband differential CQI information of codeword 1 of channel state information process 3;
if the reported channel state information contains the sub-band differential CQI information of the channel state information process 3, determining the sub-band CQI information of the channel state information process 3 according to the following mode:
the sub-band CQI number of codeword 0 of channel state information process 3 is equal to the wideband CQI number of codeword 0 of channel state information process 2-the sub-band differential CQI information of codeword 0 of channel state information process 3;
the subband CQI number of codeword 1 of channel state information process 3 is the wideband CQI number of codeword 0 of channel state information process 2-the subband differential CQI information of codeword 1 of channel state information process 3.
Referring to fig. 3, an embodiment of the present invention provides a user terminal, where the user terminal includes:
a receiving unit 30, configured to receive reference signal configuration information of multiple channel state information processes sent by a network side, information of a feedback mode corresponding to each channel state information process, and differential Channel Quality Indicator (CQI) reference information corresponding to each channel state information process, where each differential CQI reference information is information associated with one channel state information process in the multiple channel state information processes;
a determining unit 31, configured to determine a channel state information process that needs to be reported by using a differential CQI in the multiple channel state information processes, and for each determined channel state information process, determine, according to reference signal configuration information of the channel state information process and differential CQI reference information corresponding to the channel state information process, differential CQI information corresponding to the channel state information process;
a feedback unit 32, configured to report channel state information to the network side according to a feedback mode corresponding to each channel state information process, where the channel state information includes the determined differential CQI information.
Further, the determining unit 31 is configured to: determining the channel state information process needing to adopt differential CQI reporting in the plurality of channel state information processes according to the following method:
and for each channel state information process a in the plurality of channel state information processes, judging whether the channel state information process a and a channel state information process b associated with the differential CQI reference information corresponding to the channel state information process are the same process, if so, determining that the channel state information process a is not the channel state information process needing to adopt differential CQI for reporting, and otherwise, determining that the channel state information process a is the channel state information process needing to adopt differential CQI for reporting.
Further, the determining unit 31 is configured to: determining the differential CQI information corresponding to the channel state information process according to the following method:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
determining a CQI serial number corresponding to the channel state information process i according to the reference signal configuration information of the channel state information process i, and determining a CQI serial number corresponding to the channel state information process j according to the reference signal configuration information of the channel state information process j;
and determining the differential CQI information corresponding to the channel state information process i according to the CQI serial number corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j.
Further, the determining unit 31 is configured to: determining the differential CQI information corresponding to the channel state information process i according to the following method:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula I:
the formula I is as follows: wideband differential CQI information of codeword c of csi process i-wideband CQI index of codeword c of csi process j-wideband CQI index of codeword c of csi process i, where c is in {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula II:
the formula II is as follows: wideband differential CQI information for codeword c of csi process i-wideband CQI index number for codeword 0 of csi process j-wideband CQI index number for codeword c of csi process i, where c is e {0,1 }.
Further, the determining unit 31 is further configured to:
when the RI of the channel state information process i is the same as the RI of the channel state information process j, if the subband CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the subband differential CQI information of the channel state information process i is determined according to the following formula three:
the formula III is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword c of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
Further, the determining unit 31 is further configured to:
when the RI of the channel state information process i is different from the RI of the channel state information process j, if the subband CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the subband differential CQI information of the channel state information process i is determined according to the following formula:
the formula four is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword 0 of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
Further, each of the differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to the one channel state information process.
Referring to fig. 4, an embodiment of the present invention provides a base station, where the base station includes:
a sending unit 40, configured to issue, to a user terminal, reference signal configuration information of multiple channel state information processes, information of a feedback mode corresponding to each channel state information process, and differential CQI reference information corresponding to each channel state information process, where each differential CQI reference information is information associated with one channel state information process of the multiple channel state information processes;
a receiving unit 41, configured to receive channel state information reported by a user equipment, where the channel state information includes differential CQI information corresponding to a channel state information process reported by using a differential CQI;
a determining unit 42, configured to determine, for each differential CQI information corresponding to a channel state information process reported by using a differential CQI, CQI information corresponding to the channel state information process according to the differential CQI information corresponding to the channel state information process and differential CQI reference information corresponding to the channel state information process.
Further, the determining unit 42 is configured to: determining the CQI information corresponding to the channel state information process according to the following method:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
and determining the CQI information corresponding to the channel state information process i according to the differential CQI information corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i.
Further, the determining unit 42 is configured to: determining the CQI information corresponding to the channel state information process i according to the following method:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula five:
the formula five is as follows: the wideband CQI index of the codeword c of the csi process i ═ the wideband CQI index of the codeword c of the csi process j — the wideband differential CQI of the codeword c of the csi process i, where c belongs to {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula six:
formula six: wideband CQI index of codeword c of csi process i-wideband CQI index of codeword 0 of csi process j-wideband differential CQI of codeword c of csi process i, where c is e {0,1 }.
Further, the determining unit 42 is further configured to:
if the RI of the channel state information process i is the same as that of the channel state information process j, and the reported channel state information includes the subband differential CQI information of the channel state information process i, determining the subband CQI number of the channel state information process i according to the following formula seven:
the formula seven: sub-band CQI index of codeword c of csi process i-wideband CQI index of codeword c of csi process j-sub-band differential CQI of codeword c of csi process i, where c is ∈ {0,1 }.
Further, the determining unit 42 is further configured to:
when the RI of the channel state information process i is different from the RI of the channel state information process j, if the reported channel state information includes the subband differential CQI information of the channel state information process i, determining the subband CQI number of the channel state information process i according to the following formula eight:
the formula eight: the subband CQI index of codeword c of csi process i ═ the wideband CQI index of codeword 0 of csi process j — the subband differential CQI of codeword c of csi process i, where c ∈ {0,1 }.
Further, each of the differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to the one channel state information process.
In conclusion, the beneficial effects of the invention include:
in the scheme provided by the embodiment of the invention, a network side configures a plurality of channel state information processes for a user terminal during multipoint cooperative transmission, and configures differential CQI reference information for each channel state information process, the user terminal determines differential CQI information corresponding to the channel state information process according to the differential CQI reference information corresponding to the channel state information process, carries the differential CQI information in the channel state information and reports the channel state information to the network side, and the network side determines CQI information corresponding to the channel state information process according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process. Because the bit number occupied by the differential CQI information is less than that occupied by the non-differential CQI information, the resource overhead required for reporting the differential CQI information is low, and system resources are saved.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (26)

1. A method for reporting Channel Quality Indicator (CQI) information for coordinated multi-point transmission is characterized by comprising the following steps:
a user terminal receives reference signal configuration information of a plurality of channel state information processes issued by a network side, information of a feedback mode corresponding to each channel state information process and differential CQI reference information corresponding to each channel state information process, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
the user terminal determines the channel state information process needing to adopt the differential CQI to report in the plurality of channel state information processes, and for each determined channel state information process, the differential CQI information corresponding to the channel state information process is determined according to the reference signal configuration information of the channel state information process and the differential CQI reference information corresponding to the channel state information process;
and the user terminal reports the channel state information to the network side according to the feedback mode corresponding to each channel state information process, wherein the channel state information comprises the determined differential CQI information.
2. The method of claim 1, wherein the determining, by the ue, the channel state information process that needs to be reported by using a differential CQI from among the plurality of channel state information processes specifically comprises: the user terminal judges whether the channel state information process a and the channel state information process b associated with the differential CQI reference information corresponding to the channel state information process are the same process or not for each channel state information process a in the plurality of channel state information processes, if so, the channel state information process a is determined not to be the channel state information process needing adopting differential CQI for reporting, otherwise, the channel state information process a is determined to be the channel state information process needing adopting differential CQI for reporting.
3. The method of claim 1, wherein the determining the differential CQI information corresponding to the channel state information process according to the reference signal configuration information of the channel state information process and the differential CQI reference information corresponding to the channel state information process specifically comprises:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
determining a CQI serial number corresponding to the channel state information process i according to the reference signal configuration information of the channel state information process i, and determining a CQI serial number corresponding to the channel state information process j according to the reference signal configuration information of the channel state information process j;
and determining the differential CQI information corresponding to the channel state information process i according to the CQI serial number corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j.
4. The method of claim 3, wherein the determining the differential CQI information corresponding to the csi process i according to the CQI number corresponding to the csi process i and the CQI number corresponding to the csi process j specifically comprises:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula I:
the formula I is as follows: wideband differential CQI information of codeword c of csi process i-wideband CQI index of codeword c of csi process j-wideband CQI index of codeword c of csi process i, where c is in {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula II:
the formula II is as follows: wideband differential CQI information for codeword c of csi process i-wideband CQI index number for codeword 0 of csi process j-wideband CQI index number for codeword c of csi process i, where c is e {0,1 }.
5. The method of claim 4, wherein when the RI of the csi process i is the same as the RI of the csi process j, if the sub-band CQI of the csi process i needs to be reported is determined according to the feedback mode corresponding to the csi process i, the sub-band differential CQI of the csi process i is determined according to the following formula three:
the formula III is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword c of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
6. The method of claim 4, wherein when the RI of the csi process i is different from the RI of the csi process j, if the sub-band CQI of the csi process i needs to be reported is determined according to the feedback mode corresponding to the csi process i, the sub-band differential CQI of the csi process i is determined according to the following formula:
the formula four is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword 0 of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
7. The method of any of claims 1-6, wherein each differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to one channel state information process.
8. A method for determining channel quality indicator, CQI, information for coordinated multipoint transmission, the method comprising:
the method comprises the steps that a network side issues reference signal configuration information of a plurality of channel state information processes, information of a feedback mode corresponding to each channel state information process and differential CQI reference information corresponding to each channel state information process to a user terminal, wherein each differential CQI reference information is information associated with one channel state information process in the plurality of channel state information processes;
a network side receives channel state information reported by a user terminal, wherein the channel state information comprises differential CQI information corresponding to a channel state information process reported by adopting differential CQI;
and the network side determines the CQI information corresponding to each channel state information process reported by adopting the differential CQI according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process.
9. The method of claim 8, wherein the determining the CQI information corresponding to the channel state information process according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process specifically comprises:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
and determining the CQI information corresponding to the channel state information process i according to the differential CQI information corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i.
10. The method according to claim 9, wherein the determining the CQI information corresponding to the channel state information process i according to the differential CQI information corresponding to the channel state information process i and the CQI number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i specifically includes:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula five:
the formula five is as follows: the wideband CQI index of the codeword c of the csi process i ═ the wideband CQI index of the codeword c of the csi process j — the wideband differential CQI of the codeword c of the csi process i, where c belongs to {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula six:
formula six: wideband CQI index of codeword c of csi process i-wideband CQI index of codeword 0 of csi process j-wideband differential CQI of codeword c of csi process i, where c is e {0,1 }.
11. The method of claim 10, wherein when the RI of the csi process i is the same as the RI of the csi process j, if the reported csi includes the subband differential CQI of the csi process i, the subband CQI number of the csi process i is determined according to the following formula seven:
the formula seven: sub-band CQI index of codeword c of csi process i-wideband CQI index of codeword c of csi process j-sub-band differential CQI of codeword c of csi process i, where c is ∈ {0,1 }.
12. The method of claim 10, wherein when the RI of the csi process i is different from the RI of the csi process j, if the reported csi includes the subband differential CQI of the csi process i, the subband CQI number of the csi process i is determined according to the following formula eight:
the formula eight: the subband CQI index of codeword c of csi process i ═ the wideband CQI index of codeword 0 of csi process j — the subband differential CQI of codeword c of csi process i, where c ∈ {0,1 }.
13. The method of any of claims 8-12, wherein each differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to one channel state information process.
14. A user terminal, characterized in that the user terminal comprises:
a receiving unit, configured to receive reference signal configuration information of multiple channel state information processes issued by a network side, information of a feedback mode corresponding to each channel state information process, and differential Channel Quality Indicator (CQI) reference information corresponding to each channel state information process, where each differential CQI reference information is information associated with one channel state information process in the multiple channel state information processes;
a determining unit, configured to determine a channel state information process that needs to be reported by using a differential CQI in the multiple channel state information processes, and for each determined channel state information process, determine differential CQI information corresponding to the channel state information process according to reference signal configuration information of the channel state information process and differential CQI reference information corresponding to the channel state information process;
and the feedback unit is used for reporting the channel state information to the network side according to the feedback mode corresponding to each channel state information process, wherein the channel state information comprises the determined differential CQI information.
15. The user terminal of claim 14, wherein the determining unit is configured to: determining the channel state information process needing to adopt differential CQI reporting in the plurality of channel state information processes according to the following method:
and for each channel state information process a in the plurality of channel state information processes, judging whether the channel state information process a and a channel state information process b associated with the differential CQI reference information corresponding to the channel state information process are the same process, if so, determining that the channel state information process a is not the channel state information process needing to adopt differential CQI for reporting, and otherwise, determining that the channel state information process a is the channel state information process needing to adopt differential CQI for reporting.
16. The user terminal of claim 14, wherein the determining unit is configured to: determining the differential CQI information corresponding to the channel state information process according to the following method:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
determining a CQI serial number corresponding to the channel state information process i according to the reference signal configuration information of the channel state information process i, and determining a CQI serial number corresponding to the channel state information process j according to the reference signal configuration information of the channel state information process j;
and determining the differential CQI information corresponding to the channel state information process i according to the CQI serial number corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j.
17. The user terminal of claim 16, wherein the determining unit is configured to: determining the differential CQI information corresponding to the channel state information process i according to the following method:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula I:
the formula I is as follows: wideband differential CQI information of codeword c of csi process i-wideband CQI index of codeword c of csi process j-wideband CQI index of codeword c of csi process i, where c is in {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband differential CQI information of the channel state information process i according to the following formula II:
the formula II is as follows: wideband differential CQI information for codeword c of csi process i-wideband CQI index number for codeword 0 of csi process j-wideband CQI index number for codeword c of csi process i, where c is e {0,1 }.
18. The user terminal of claim 17, wherein the determining unit is further configured to:
when the RI of the channel state information process i is the same as the RI of the channel state information process j, if the subband CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the subband differential CQI information of the channel state information process i is determined according to the following formula three:
the formula III is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword c of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
19. The user terminal of claim 17, wherein the determining unit is further configured to:
when the RI of the channel state information process i is different from the RI of the channel state information process j, if the subband CQI information of the channel state information process i needs to be reported is determined according to the feedback mode corresponding to the channel state information process i, the subband differential CQI information of the channel state information process i is determined according to the following formula:
the formula four is as follows: the subband differential CQI information for codeword c of csi i-the wideband CQI index for codeword 0 of csi process j-the subband CQI index for codeword c of csi process i, where c is e {0,1 }.
20. The user terminal according to any of claims 14-19, wherein each differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to one channel state information process.
21. A base station, comprising:
a sending unit, configured to send reference signal configuration information of a plurality of channel state information processes, information of a feedback mode corresponding to each channel state information process, and differential CQI reference information corresponding to each channel state information process to a user terminal, where each differential CQI reference information is information associated with one channel state information process of the plurality of channel state information processes;
a receiving unit, configured to receive channel state information reported by a user terminal, where the channel state information includes differential CQI information corresponding to a channel state information process reported by using a differential CQI;
and the determining unit is used for determining the CQI information corresponding to each channel state information process reported by adopting the differential CQI according to the differential CQI information corresponding to the channel state information process and the differential CQI reference information corresponding to the channel state information process.
22. The base station of claim 21, wherein the determining unit is configured to: determining the CQI information corresponding to the channel state information process according to the following method:
the number of the channel state information process is i, and the number of the channel state information process associated with the differential CQI reference information corresponding to the channel state information process i is j;
and determining the CQI information corresponding to the channel state information process i according to the differential CQI information corresponding to the channel state information process i and the CQI serial number corresponding to the channel state information process j associated with the differential CQI reference information corresponding to the channel state information process i.
23. The base station of claim 22, wherein the determining unit is configured to: determining the CQI information corresponding to the channel state information process i according to the following method:
if the rank indication RI of the channel state information process i is the same as the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula five:
the formula five is as follows: the wideband CQI index of the codeword c of the csi process i ═ the wideband CQI index of the codeword c of the csi process j — the wideband differential CQI of the codeword c of the csi process i, where c belongs to {0,1 }; or,
if the RI of the channel state information process i is different from the RI of the channel state information process j, determining the wideband CQI serial number of the channel state information process i according to the following formula six:
formula six: wideband CQI index of codeword c of csi process i-wideband CQI index of codeword 0 of csi process j-wideband differential CQI of codeword c of csi process i, where c is e {0,1 }.
24. The base station of claim 23, wherein the determining unit is further configured to:
if the RI of the channel state information process i is the same as that of the channel state information process j, and the reported channel state information includes the subband differential CQI information of the channel state information process i, determining the subband CQI number of the channel state information process i according to the following formula seven:
the formula seven: sub-band CQI index of codeword c of csi process i-wideband CQI index of codeword c of csi process j-sub-band differential CQI of codeword c of csi process i, where c is ∈ {0,1 }.
25. The base station of claim 23, wherein the determining unit is further configured to:
when the RI of the channel state information process i is different from the RI of the channel state information process j, if the reported channel state information includes the subband differential CQI information of the channel state information process i, determining the subband CQI number of the channel state information process i according to the following formula eight:
the formula eight: the subband CQI index of codeword c of csi process i ═ the wideband CQI index of codeword 0 of csi process j — the subband differential CQI of codeword c of csi process i, where c ∈ {0,1 }.
26. The base station of any of claims 21-25, wherein each differential CQI reference information is an index of one of the plurality of channel state information processes or an index of a feedback mode corresponding to one channel state information process.
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