CN103517281A

CN103517281A - Method for feeding interference information back and controlling interference, and device thereof

Info

Publication number: CN103517281A
Application number: CN201210211736.4A
Authority: CN
Inventors: 徐婧; 潘学明; 沈祖康
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT
Priority date: 2012-06-20
Filing date: 2012-06-20
Publication date: 2014-01-15
Also published as: WO2013189271A1

Abstract

An embodiment of the invention discloses a method for feeding interference information back and controlling interference, and a device thereof. The method and the device of the invention relate to the technical field of wireless communication and are used for reducing cross interference of a system. In the device of the invention, a transmission node device acquires interference measurement configuration information and performs cross interference measurement according to the acquired interference measurement configuration information for acquiring the cross interference information. The cross interference information is transmitted to other transmission node devices or a central node device. Other transmission node devices or the central node device perform interference control according to the cross interference information, thereby achieving a purpose of reducing cross interference.

Description

Feedback of interference information and interference control method and device

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for feedback of interference information and interference control.

Background

For the basic duplex approach employed by cellular systems: a Time Division Duplex (TDD) mode refers to that uplink and downlink use the same working frequency band, and uplink and downlink signals are transmitted at different Time intervals, and a Guard Period (GP) is provided between the uplink and the downlink; the Frequency Division Duplex (FDD) mode means that the uplink and downlink use different operating Frequency bands, and can transmit uplink and downlink signals on different Frequency carriers at the same time, and a Guard bandwidth (Guard Band) exists between the uplink and downlink, as shown in fig. 1, where T in fig. 1 indicates transmission and R indicates reception.

A frame structure of a Long Term Evolution (LTE) TDD system is slightly complex, as shown in fig. 2, a length of a radio frame is 10ms, and the radio frame includes two types of special subframes and normal subframes, which are 10 subframes in total, and each subframe is 1 ms. The special subframe is divided into 3 slots: downlink special time slot (DwPTS), GP, and uplink special time slot (UpPTS). The normal subframe includes an uplink subframe and a downlink subframe, and is used for transmitting uplink/downlink control signaling, service data and the like. In one radio frame, two special subframes (located in subframe #1 and subframe #6, respectively) may be configured, or one special subframe (located in subframe #1) may be configured. DwPTS in the subframe #0 and the subframe #5 and the special subframe are always used for downlink transmission, UpPTS in the subframe #2 and the special subframe are always used for uplink transmission, and other subframes may be configured to be used for uplink transmission or downlink transmission as needed.

In a time division long term evolution (TD-LTE) system, the sum of three timeslots DwPTS, GP and UpPTS in a special subframe is 1ms, and the three timeslot lengths are divided to support different configuration situations, as shown in table 1, where the unit of time length is Ts, T_s=1(15000 × 2048) seconds.

TABLE 1

In the TD-LTE system, uplink and downlink subframe allocation supports 7 different modes, and specific configuration parameters are shown in table 2 below, where D denotes to be used for downlink transmission, U denotes to be used for uplink transmission, and S denotes to be a special subframe including DwPTS, GP, and UpPTS.

TABLE 2

The special subframe configuration and the uplink and downlink subframe allocation mode are broadcasted to all users in the cell through System Information (SI).

As can be seen from the above description, the TD-LTE system supports changing the above two frame configuration parameters by means of system information Change (systeminformationchange), but the Change requires processes of paging and re-reading system information, and has several ambiguity problems before and after the Change, such as adverse effects on Hybrid Automatic Repeat reQuest (HARQ) operation and scheduling, and if the frame configuration is changed frequently, the system performance may be seriously degraded. Moreover, the minimum frame configuration change period supported in the TD-LTE system is 640ms, and the dynamic change requirement of the service cannot be completely adapted.

Based on this, a dynamic uplink and downlink subframe allocation scheme is provided, which specifically comprises the following steps:

in a certain time period, four subframe types are set, including a subframe fixedly used for downlink transmission, a subframe fixedly used for uplink transmission, and a subframe flexibly allocated to uplink or downlink transmission. The time period is a radio frame, where subframe #0 and subframe #5 are fixed downlink subframes, subframe #2 and frame #7 are fixed uplink subframes, subframe #1 and subframe #6 are special subframes (which may also be classified as fixed downlink subframes), and other subframes (subframe #3, subframe #4, subframe #8 and subframe #9) are subframes flexibly allocated for uplink or downlink transmission. For the last type of subframe, the base station can perform dynamic configuration according to the real-time service requirement and the channel condition so as to adapt to the dynamic change of the service requirement.

In summary, the prior art discloses a method for dynamically configuring a TDD subframe. In an actual system, if different cells independently set different uplink and downlink subframe configurations, cross slot interference of adjacent cells may be caused, as shown in fig. 3, the L-UE in fig. 3 is a terminal belonging to a low power node. It is noted that the neighboring cells herein may be geographically adjacent cells using the same TDD carrier as shown in fig. 3, or geographically overlapping or adjacent cells using adjacent TDD carriers as shown in fig. 4. Meanwhile, the cell may be a cell deployed in the same layer (e.g., a macro cell), or may be a cell deployed in a hierarchical layer (e.g., a macro cell, a micro cell, a cell under a home base station, etc.). Therefore, although a scheme for dynamically configuring a TDD subframe is provided in the prior art, the problem of cross slot interference caused by the scheme is not solved, and thus, the system performance is reduced.

Disclosure of Invention

The embodiment of the invention provides a feedback and interference control method and device of interference information, which are used for reducing cross interference of a system.

A method for feeding back interference information, the method comprising:

the transmission node device acquires interference measurement configuration information, and performs cross interference measurement according to the acquired interference measurement configuration information to obtain cross interference information;

and the transmission node device sends the cross interference information to other transmission node devices or a central node device.

A method of interference control, the method comprising:

the transmission node device receives cross interference information sent by other transmission node devices;

and the transmission node device performs power control or adjusts uplink and downlink configuration according to the cross interference information so as to reduce the cross interference intensity of the transmission node device to other transmission node devices.

A method of interference control, the method comprising:

the central node device receives cross interference information sent by the transmission node device;

and the central node device instructs one or more transmission node devices to perform power control or adjust uplink and downlink configuration according to the cross interference information so as to reduce the cross interference strength among the transmission node devices.

A transmission node apparatus, the apparatus comprising:

an obtaining unit, configured to obtain interference measurement configuration information;

the measuring unit is used for carrying out cross interference measurement according to the acquired interference measurement configuration information to obtain cross interference information;

and the sending unit is used for sending the cross interference information to other transmission node devices or the central node device.

A transmission node apparatus, the apparatus comprising:

a receiving unit, configured to receive cross interference information sent by another transmission node apparatus;

and the interference control unit is used for carrying out power control or adjusting uplink and downlink configuration according to the cross interference information so as to reduce the cross interference strength of the transmission node device to other transmission node devices.

A central node apparatus, the apparatus comprising:

a receiving unit, configured to receive cross interference information sent by a transmission node apparatus;

and the interference control unit is used for indicating one or more transmission node devices to carry out power control or adjusting uplink and downlink configuration according to the cross interference information so as to reduce the cross interference strength among the transmission node devices.

In one scheme provided by the embodiment of the invention, the transmission node device acquires interference measurement configuration information, performs cross interference measurement according to the acquired interference measurement configuration information to obtain cross interference information, and sends the cross interference information to other transmission node devices or a central node device.

In another scheme provided in the embodiment of the present invention, a transmission node apparatus receives cross interference information sent by other transmission node apparatuses, and performs power control or adjusts uplink and downlink configuration according to the received cross interference information, so as to reduce cross interference strength of the transmission node apparatus to other transmission node apparatuses. Therefore, the transmission node device carries out cross interference control according to the cross interference information sent by other transmission node devices, and the purpose of reducing cross interference is achieved.

In another scheme provided in the embodiment of the present invention, the central node device receives cross interference information sent by the transmission node device, and performs power control or adjusts uplink and downlink configuration according to the received cross interference information, so as to reduce the strength of cross interference between the transmission node devices. Therefore, the scheme realizes that the central node device carries out cross interference control according to the cross interference information sent by the transmission node device, and further achieves the purpose of reducing cross interference.

Drawings

FIG. 1 is a diagram illustrating a time-frequency relationship of a basic duplex mode in the prior art;

FIG. 2 is a schematic diagram of a frame structure of a TD-LTE system in the prior art;

FIG. 3 is a diagram illustrating cross-slot TDD interference in the prior art;

fig. 4 is a schematic diagram illustrating TDD neighboring carriers setting different uplink and downlink configurations in the prior art;

FIG. 5 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 6 is a schematic flow chart of another method provided by the embodiments of the present invention;

FIG. 7 is a schematic flow chart of another method provided by the embodiments of the present invention;

FIG. 8a is a schematic flow chart according to a first embodiment of the present invention;

FIG. 8b is a schematic flow chart of the second embodiment of the present invention;

FIG. 8c is a schematic flow chart of a third embodiment of the present invention;

FIG. 8d is a schematic flow chart according to a fourth embodiment of the present invention;

FIG. 8e is a schematic flow chart of a fifth embodiment of the present invention;

FIG. 8f is a schematic flow chart of a sixth embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.

Detailed Description

In order to solve the problem how to transmit cross interference information to a device performing cross interference control, so that the device can perform cross interference control using the cross interference information to reduce cross interference, an embodiment of the present invention provides a method for feeding back interference information.

Referring to fig. 5, the method for feeding back interference information according to the embodiment of the present invention includes the following steps:

step 50: the transmission node device acquires interference measurement configuration information, and performs cross interference measurement according to the acquired interference measurement configuration information to obtain cross interference information; here, the cross interference information may include information of signal interference from another transmission node received by the transmission node apparatus in the uplink transmission direction, that is, interference information of an uplink signal of the transmission node apparatus by a downlink signal of the other transmission node apparatus. Of course, the transmission node apparatus may receive information of signal interference from another transmission node in the downlink transmission direction, that is, interference information of an uplink signal of another transmission node apparatus with a downlink signal of the transmission node apparatus.

Step 51: the transmission node device transmits the cross interference information to other transmission node devices or the center node device.

In step 50, the interference measurement configuration information obtained by the transmission node apparatus at least includes measurement pilot configuration information. The transmission node device obtains the interference measurement configuration information, and specifically, may adopt four methods as follows

The method comprises the following steps: the transmission node device acquires a cell identifier from the neighbor cell list, determines measurement pilot frequency configuration information corresponding to the acquired cell identifier according to a binding relationship between a preset cell identifier and the measurement pilot frequency configuration information, and takes the determined measurement pilot frequency configuration information as interference measurement configuration information;

the second method comprises the following steps: the transmission node device receives measurement pilot frequency configuration information sent by the central node device, and takes the received measurement pilot frequency configuration information as interference measurement configuration information; here, the measurement pilot configuration information sent by the central node apparatus may include measurement pilot configuration information corresponding to each transmission node apparatus in the system.

The third method comprises the following steps: the transmission node device receives measurement pilot frequency configuration information sent by the central node device and information of the transmission node device corresponding to the measurement pilot frequency configuration information, and takes the received measurement pilot frequency configuration information and the information of the transmission node device corresponding to the measurement pilot frequency configuration information as interference measurement configuration information;

the method four comprises the following steps: the transmission node device obtains measurement pilot configuration information corresponding to other transmission node devices by interacting with the other transmission node devices, and the obtained measurement pilot configuration information is used as interference measurement configuration information.

The measurement pilot configuration information corresponding to a transmission node device refers to the relevant configuration information of the pilot sequence sent by the transmission node device.

In step 50, the transmission node device performs cross interference measurement according to the obtained interference measurement configuration information to obtain cross interference information, specifically, the transmission node device measures the signal strength of the pilot sequence transmitted through the resource on the resource indicated by the measurement pilot configuration information in the measurement interference measurement configuration information, and obtains cross interference information according to the measurement result.

The cross-interference information may be:

load indication (OI) information carrying cross interference strength information, the existing IE can be directly adopted by adopting the mode, the signaling overhead is reduced, the compatibility is good, and the complexity of standardization and equipment realization is avoided; or,

information indicating the strength of the cross interference, in a simple and straightforward manner; or

The method multiplexes the measurement quantity in the prior art by referring to the signal received power (RSRP) information, thereby not only obtaining the cross interference information, but also avoiding increasing new measurement quantity, and being beneficial to controlling the complexity of equipment realization; or

The Coupling loss information (Coupling loss) is a measurement value obtained by conversion based on RSRP, and thus avoids an increase in a new measurement amount and an increase in complexity of equipment, and can directly characterize a potential interference situation (not affected by transmission power) between transmission node devices. The measurement quantity is particularly suitable for the scene that the interaction delay of the transmission node device is large or the interaction is not frequent.

The method for obtaining OI information carrying cross interference strength information according to the measurement result comprises the following steps: and comparing the measured signal intensity value of the pilot frequency sequence with a preset threshold value, determining the strength of the cross interference intensity according to the comparison result, and taking the determination result as cross interference intensity information to be carried in the existing OI information. For example, if the measured signal strength value of the pilot sequence is greater than a preset threshold value, determining that the cross interference strength is strong, otherwise, determining that the cross interference strength is weak; for another example, if the measured signal strength value of the pilot sequence is greater than a preset first threshold, it is determined that the cross interference strength is strong, if the measured signal strength value of the pilot sequence is less than the preset first threshold and greater than a preset second threshold, it is determined that the cross interference strength is medium, and if the measured signal strength value of the pilot sequence is less than the preset second threshold, it is determined that the cross interference strength is weak, where the first threshold is greater than the second threshold. The preset threshold value may be determined by the transmission node apparatus itself, or may be configured by the central node apparatus. Meanwhile, when the transmission node device determines the threshold value by itself, the transmission node device may transmit the threshold value to other transmission node devices or report the threshold value to the central node device.

When the cross interference strength information (BS-BS interference) is carried in the existing OI information, the information bits reserved in the existing OI information may be used to carry the cross interference strength information, or new information bits are added to the existing OI information and the new information bits are used to carry the cross interference strength information. When the information bits reserved in the existing OI information are used to carry the cross interference strength information, the specific method can be referred to as table 3 below, and when the newly added information bits are used to carry the cross interference strength information, the specific method can be referred to as table 4 and table 5 below.

TABLE 3

Table 3 multiplexes the existing enumeration format and extends over the existing IE format, avoiding the additional signaling overhead. And meanwhile, the BS-BS interference can be indicated, thereby being beneficial to the control of the cross interference.

TABLE 4

TABLE 5

An optional Information Element (IE), namely BS-BS interference overhead indication, is added in tables 4 and 5 to carry cross interference strength information, and the method is based on the expandable characteristic of the existing IE and has good compatibility. The two IE types in table 4 and table 5 are advantageous, the enumeration (ENUMERATED) type in table 4 makes feedback accurate, which is convenient for supporting more complex interference control schemes, and the BIT (BIT) signaling overhead in table 5 is small, which is suitable for scenarios with frequent interaction or limited signaling resources.

The method for obtaining the information indicating the strength of the cross interference according to the measurement result comprises the following steps: and comparing the measured signal intensity value of the pilot frequency sequence with a preset threshold value, determining the strength of the cross interference intensity according to the comparison result, and taking the determination result as the information for indicating the cross interference intensity. For example, if the measured signal strength value of the pilot sequence is greater than a preset threshold value, determining that the cross interference strength is strong, otherwise, determining that the cross interference strength is weak; for another example, if the measured signal strength value of the pilot sequence is greater than a preset first threshold, it is determined that the cross interference strength is strong, if the measured signal strength value of the pilot sequence is less than the preset first threshold and greater than a preset second threshold, it is determined that the cross interference strength is medium, and if the measured signal strength value of the pilot sequence is less than the preset second threshold, it is determined that the cross interference strength is weak, where the first threshold is greater than the second threshold. The preset threshold value may be determined by the transmission node apparatus itself, or may be configured by the central node apparatus. Meanwhile, when the transmission node device determines the threshold value by itself, the transmission node device may transmit the threshold value to other transmission node devices or report the threshold value to the central node device.

The information indicating the strength of the cross interference may employ a structure as shown in table 6 or table 7 below.

TABLE 6

TABLE 7

The method for obtaining the RSRP according to the measurement result comprises the following steps: and directly taking the signal strength value of the pilot sequence obtained by measurement as RSRP.

The RSRP information is similar to the definition in the prior art, except that the measured pilot sequence is no longer defined as a downlink common pilot. The pilot sequence may be some type of pilot configured (e.g., a channel state information measurement reference signal (CSIRS), or a modified cell-specific pilot signal (CRS), etc.).

The modified CRS may be a downlink common pilot transmitted only in limited subframes (e.g., fixed downlink subframes); the pilot sequence may be bound to the cell identifier, or may be configured by the transmission node apparatus or the central node apparatus.

Here, RSRP is not necessarily obtained based on downlink common pilot measurement, but may be obtained based on configured measurement pilots. The scheme expands the measurement pilot frequency of RSRP and is suitable for more scenes.

The method for obtaining the coupling loss according to the measurement result comprises the following steps: coupling loss = EPRE (power per resource element) -RSRP of the measured pilot sequence.

In step 51, when the transmission node device sends the cross interference information to another transmission node device, the transmission node device needs to send the cross interference information to the transmission node device corresponding to the measurement pilot configuration information used to obtain the cross interference information, so that the transmission node device receiving the cross interference information can perform interference control in a more targeted manner. The concrete description is as follows:

when the transmission node apparatus acquires the interference measurement configuration information by using the first method, the transmission node apparatus sends the cross interference information to other transmission node apparatuses, which may be specifically implemented as follows:

and the transmission node device sends the cross interference information to the transmission node device to which the cell corresponding to the acquired cell identifier belongs.

When the transmission node apparatus acquires the interference measurement configuration information by using the second method, the transmission node apparatus sends the cross interference information to other transmission node apparatuses, which may be specifically implemented as follows:

the transmission node device determines the transmission node device corresponding to the received measurement pilot configuration information according to the preset corresponding relation between the measurement pilot configuration information and the transmission node device, and sends the cross interference information to the determined transmission node device.

When the transmission node apparatus acquires the interference measurement configuration information by using the method three, the transmission node apparatus sends the cross interference information to other transmission node apparatuses, and the specific implementation may be as follows:

and the transmission node device sends the cross interference information to the transmission node device corresponding to the received measurement pilot frequency configuration information.

When the transmission node apparatus acquires the interference measurement configuration information by using the method four, the transmission node apparatus sends the cross interference information to other transmission node apparatuses, and the specific implementation may be as follows:

and the transmission node device sends the cross interference information to other transmission node devices corresponding to the obtained measurement pilot frequency configuration information.

Similarly, in step 51, when the transmission node device sends the cross interference information to the central node device, the central node device needs to be able to obtain the measurement pilot configuration information or the transmission node device corresponding to the received cross interference information, so that the central node device can perform interference control in a more targeted manner. The method comprises the following specific steps:

when the transmission node apparatus acquires the interference measurement configuration information by using the first method, the transmission node apparatus sends the cross interference information to the center node apparatus, which may be specifically implemented as follows:

the transmission node device sends the cross interference information and the corresponding measurement pilot frequency configuration information identification to the central node device; the measurement pilot frequency configuration information corresponding to the cross interference information means measurement pilot frequency configuration information used for obtaining the cross interference information; or,

and the transmission node device sends the cross interference information and the information of the transmission node device to which the cell corresponding to the acquired cell identifier belongs to the central node device.

When the transmission node device acquires the interference measurement configuration information by using the second method, the transmission node device sends the cross interference information to the central node device, and the specific implementation can be as follows:

the transmission node device sequentially sends the cross interference information measured according to the measurement pilot frequency configuration information to the central node device according to the receiving sequence of the measurement pilot frequency configuration information; or,

the transmission node device sends the cross interference information and the received identification of the measurement pilot frequency configuration information to the central node device; or,

the transmission node device determines the transmission node device corresponding to the received measurement pilot configuration information according to the preset corresponding relationship between the measurement pilot configuration information and the transmission node device, and sends the cross interference information and the determined information of the transmission node device to the central node device.

When the transmission node device acquires the interference measurement configuration information by using the method three, the transmission node device sends the cross interference information to the central node device, and the specific implementation can be as follows:

and the transmission node device sends the cross interference information and the information of the transmission node device corresponding to the received measurement pilot frequency configuration information to the central node device.

When the transmission node apparatus acquires the interference measurement configuration information by using the method four, the transmission node apparatus sends the cross interference information to the central node apparatus, which can be specifically realized as follows:

the transmission node device sends the cross interference information and the obtained identification of the measurement pilot frequency configuration information to the central node device; or,

the transmission node apparatus transmits the cross interference information and information of other transmission node apparatuses that transmit the obtained measurement pilot configuration information to the center node apparatus.

In step 51, when the transmission node apparatus sends the cross interference information to other transmission node apparatuses, the reported cross interference information needs to correspond to the transmission node apparatus, that is, the cross interference information is sent to the transmission node apparatus corresponding to the measurement pilot configuration information used to obtain the cross interference information, as shown in fig. 8 a. The conditions used in this way are: the transmission node apparatus needs to know the correspondence between the measurement pilot configuration information and the transmission node apparatus. This correspondence may be implicitly obtained, for example, by binding the measurement pilot configuration information (e.g., the pilot sequence and the identification of the transmission node apparatus) in advance. The central node device may notify the corresponding relationship to the transmission node device, or the transmission node devices may interact with each other to obtain measurement pilot configuration information of the other party.

In step 51, as shown in fig. 8b, the transmission node apparatus sends the cross interference information and the identifier of the measurement pilot configuration information to the central node apparatus, and as shown in fig. 8c, the transmission node apparatus sends the cross interference information and the information of the transmission node apparatus to the central node apparatus.

The central node means may be a logic module, which may be included in the macro base station or in some of the transmission node means (e.g. low power node, Pico, femto, etc.), and the central node means may be an Operation and Maintenance (OM) unit, or may be implemented by an entity.

As shown in fig. 8b, the transmission node apparatus only needs to establish the corresponding relationship between the measurement pilot configuration information and the cross interference information. Wherein the list of measurement pilot configuration information may be informed by the central node means to the respective transmission node means.

As shown in fig. 8c, the transmission node apparatus needs to establish a corresponding relationship between the transmission node apparatus and the cross interference information. This correspondence may be derived from the correspondence of the measurement pilot configuration information with the transmission node apparatus. The corresponding relation between the measurement pilot configuration information and the transmission node device can be directly configured by the central node device or can be obtained by interaction between the transmission node devices.

For the two reporting modes shown in fig. 8b and fig. 8c, the interface may be one of the following two interfaces, but is not limited to the following two interfaces: an X2 interface, an air interface.

For the two reporting modes, the reporting triggering condition may be one of the following three types, but is not limited to the following three types: accessing to initial report; reporting periodically; and triggering and reporting the event.

The explanation of implicitly obtaining the measurement pilot configuration information by the transmission node apparatus is as follows: when the cross interference measurement is based on the downlink common pilot, the transmission node apparatus may directly correspond the measurement result to the transmission node apparatus because the downlink common pilot is bound to the cell identifier (cell _ ID).

In the method, the measuring the pilot configuration information includes: sequence information, configuration information, period information, and starting subframe information; wherein the sequence information indicates a measured pilot sequence; the configuration information indicates Resource Element (RE) positions within one Physical Resource Block (PRB) at the time of measurement; the period information indicates a measured time period; the start subframe information indicates a subframe where measurement starts.

Further, the measurement pilot configuration information may further include: one or more of antenna port information, transmission power information, frequency point and bandwidth information; the antenna port information indicates the antenna port where the pilot frequency sequence is located; the transmission power information indicates the transmission power of the pilot sequence; and measuring the frequency point and the bandwidth of the frequency point and the bandwidth information.

The concrete description is as follows:

sequence information, typically the construction of a sequence is protocol-determined, so sequence information typically refers to initialization information for a sequence. E.g., CSI-RS (channel-sta)te-information reference signal, downlink measurement pilot), the initialization mode of the pseudo random sequence is: c. C_init=2¹⁰·(7·(n_s+1)+l+1)·(2·X+1)+2·X+N_CPWherein X needs to be explicitly signaled to the transmitting node device. For example, CRS, the initialization method of its pseudo-random sequence is:

where ns is the slot number within the radio frame, l is the OFDM symbol sequence,

is a cell identity (cell ID), N_CPRelated to CP configuration.Available in the neighbor cell list.

Configuration information (pattern): the configuration information refers to the position of the pilot sequence to be measured within the subframe, also known as the pilot pattern. For example, there are at most 32 pilot patterns available for CSI-RS (TDD system), and it needs to explicitly inform the transmission node which pilot pattern to use for cross interference measurement. E.g., CRS pilot pattern, except that different cells are offset differently in the frequency domain. Therefore, as long as it knows

The pilot pattern is also known. Wherein,

available in the neighbor cell list.

Period and starting subframe information: the period and starting subframe information indicates in which subframes the pilot sequences to be measured are transmitted. For example, there are 155 different combinations of periodicity and starting subframe for CSI-RS, and it is necessary to explicitly inform the transmitting node apparatus about which subframes can be used for cross interference measurement. For example, CRS may be transmitted every subframe or only in certain subframes. This rule has been agreed in the protocol, so the transmission node apparatus can know in which sub-frames the measurement pilot is transmitted only by referring to the agreement of the protocol, and signaling is not needed.

Antenna port: different antenna ports in the same set of pilot configurations may be transmitted by one transmission node or different transmission nodes. For a scenario in which different antenna ports are transmitted by one transmission node, the scenario may adopt CSI-RS or CRS, and the scenario does not need to notify specific antenna port information. For scenarios where different antenna ports are transmitted by different transmission nodes, the scenarios generally employ CSI-RS. In this scenario, different antenna ports need to be distinguished, and even the correspondence between different antenna ports and transmission nodes needs to be clarified.

Transmission power: the transmission power generally refers to the transmission power of the measurement pilot on each resource element. This information is typically required to be notified in scenarios where a pathloss, or a uploading loss, needs to be obtained. This information is explicitly signaled. The explicitly informed interface may be the X2 interface or the air interface or others. The explicit notification may be an initial access notification or a periodic notification or an event-triggered notification.

In order to solve the problem of how to perform cross interference control on a transmission node device, which is a device capable of performing cross interference control, so as to reduce cross interference, an embodiment of the present invention provides an interference control method.

Referring to fig. 6, an interference control method provided in an embodiment of the present invention includes the following steps:

step 60: the transmission node device receives cross interference information sent by other transmission node devices;

step 61: the transmission node device performs power control or adjusts uplink and downlink configuration according to the cross interference information to reduce the cross interference strength of the transmission node device to other transmission node devices. Specifically, if the transmission node device receiving the cross interference information judges that the interference of the transmission node device itself to the transmission node device sending the cross interference information is large according to the cross interference information, the signal transmission power of the transmission node device itself in the subframe/time slot with the large interference is reduced, or the uplink and downlink configuration of the transmission node device itself is adjusted, so that the signal transmission direction of the transmission node device receiving the cross interference information in the subframe/time slot with the large interference is the same as the signal transmission direction of the transmission node device sending the cross interference information in the subframe/time slot; for example, the transmission node apparatus a adopts the uplink and downlink subframe configuration 1 in table 2, the transmission node apparatus B adopts the uplink and downlink subframe configuration 3 in table 2, and after receiving the cross interference information from the transmission node apparatus B, the transmission node apparatus a determines that the downlink transmission in the subframe 4 itself brings large interference to the uplink transmission in the subframe 4 of the transmission node apparatus B according to the cross interference information, and then the transmission node apparatus a can adjust the uplink and downlink configuration itself to the uplink and downlink subframe configuration 3, so that the subframe 4 itself and the subframe 4 of the transmission node apparatus B are the same-direction subframe, thereby avoiding cross interference.

Preferably, before the transmission node apparatus receives the cross interference information sent by the other transmission node apparatus, the transmission node apparatus sends the measurement pilot configuration information corresponding to the transmission node apparatus to the other transmission node apparatus.

In order to solve the problem of how to perform cross interference control on another device capable of performing cross interference control, that is, a central node device, so as to reduce cross interference, an embodiment of the present invention provides an interference control method.

Referring to fig. 7, an interference control method provided in an embodiment of the present invention includes the following steps:

step 70: the central node device receives cross interference information sent by the transmission node device;

step 71: the central node device instructs one or more transmission node devices to perform power control or adjust uplink and downlink configuration according to the cross interference information, so as to reduce the cross interference strength between the transmission node devices. Specifically, the central node device determines a transmission node device generating a large interference to other transmission node devices according to the received cross interference information, and then instructs the determined transmission node device to reduce the signal transmission power in the subframe/time slot with the large interference, or instructs the determined transmission node device to adjust the uplink and downlink configuration, so that the signal transmission direction of the transmission node device in the subframe/time slot with the large interference is the same as the signal transmission direction of the transmission node device subjected to the interference in the subframe/time slot; for example, the transmission node apparatus a adopts the uplink and downlink subframe configuration 1 in table 2, the transmission node apparatus B adopts the uplink and downlink subframe configuration 3 in table 2, and after receiving the cross interference information from the transmission node apparatus B, the central node apparatus determines that the downlink transmission of the transmission node apparatus a in the subframe 4 brings great interference to the uplink transmission of the transmission node apparatus B in the subframe 4 according to the cross interference information, and then the central node apparatus instructs the transmission node apparatus a to adjust the uplink and downlink configuration to the uplink and downlink subframe configuration 3, so that the subframe 4 of the transmission node apparatus a and the subframe 4 of the transmission node apparatus B are the same-direction subframe, thereby avoiding cross interference.

The central node apparatus may determine, according to measurement pilot configuration information or a transmission node apparatus corresponding to the cross interference information, which transmission node apparatus transmits the cross interference information is the received cross interference information. For example, the central node device receives cross interference information sent by the transmission node device 1, where the cross interference information corresponds to the measurement pilot configuration 1, and the measurement pilot configuration 1 corresponds to the transmission node device 2, and the cross interference information is interference information of the transmission node device 1 by the transmission node device 2; for another example, when the center node apparatus receives the cross interference information transmitted from the transmission node apparatus 1, and the cross interference information corresponds to the transmission node apparatus 2, the cross interference information is the interference information of the transmission node apparatus 1 by the transmission node apparatus 2.

Preferably, the central node device sends the interference measurement configuration information to the transmission node device before the central node device receives the cross interference information sent by the transmission node device.

Specifically, the interference measurement configuration information includes measurement pilot configuration information of the transmission node apparatus; or, the interference measurement configuration information includes measurement pilot configuration information and information of a transmission node apparatus corresponding to the measurement pilot configuration information.

As shown in fig. 8d, the central node apparatus notifies each transmission node of the identity of the measurement pilot configuration information, respectively.

As shown in fig. 8e, the central node apparatus notifies each transmission node apparatus of the identifier of the measurement pilot configuration information and the identifier of the corresponding transmission node apparatus, respectively.

As shown in fig. 8f, the transmission node apparatuses exchange their own measurement pilot configuration information, and the transmission node apparatuses can establish a corresponding relationship between the transmission node apparatuses and the measurement pilot configuration information.

Referring to fig. 9, an embodiment of the present invention provides a transmission node apparatus, including:

an obtaining unit 90, configured to obtain interference measurement configuration information;

the measurement unit 91 is configured to perform cross interference measurement according to the acquired interference measurement configuration information to obtain cross interference information;

a sending unit 92, configured to send the cross interference information to other transmission node devices or a central node device.

Further, the obtaining unit 90 is configured to: obtaining interference measurement configuration information according to one of the following methods:

the method comprises the following steps: acquiring a cell identifier from an adjacent cell list, determining measurement pilot frequency configuration information corresponding to the acquired cell identifier according to a binding relationship between a preset cell identifier and the measurement pilot frequency configuration information, and taking the determined measurement pilot frequency configuration information as interference measurement configuration information;

the second method comprises the following steps: receiving measurement pilot frequency configuration information sent by a central node device, and taking the received measurement pilot frequency configuration information as interference measurement configuration information;

the third method comprises the following steps: receiving measurement pilot frequency configuration information sent by a central node device and information of a transmission node device corresponding to the measurement pilot frequency configuration information, and taking the received measurement pilot frequency configuration information and the information of the transmission node device corresponding to the measurement pilot frequency configuration information as interference measurement configuration information;

the method four comprises the following steps: and acquiring measurement pilot frequency configuration information corresponding to other transmission node devices by interacting with the other transmission node devices, and taking the acquired measurement pilot frequency configuration information as interference measurement configuration information.

Further, the sending unit 92 is configured to: transmitting the cross interference information to other transmission node devices according to the following method:

when interference measurement configuration information is acquired by adopting the first method, the cross interference information is sent to a transmission node device to which a cell corresponding to the acquired cell identifier belongs; or,

when interference measurement configuration information is acquired by adopting the second method, determining a transmission node device corresponding to the received measurement pilot frequency configuration information according to the preset corresponding relation between the measurement pilot frequency configuration information and the transmission node device, and sending the cross interference information to the determined transmission node device; or,

when interference measurement configuration information is acquired by adopting the third method, the cross interference information is sent to a transmission node device corresponding to the received measurement pilot frequency configuration information; or,

and when interference measurement configuration information is acquired by adopting the method IV, the cross interference information is sent to other transmission node devices corresponding to the acquired measurement pilot frequency configuration information.

Further, the sending unit 92 is configured to: when the interference measurement configuration information is acquired by adopting the first method, the cross interference information is sent to the central node device according to the following method:

sending the cross interference information and the corresponding measurement pilot frequency configuration information identifier to a central node device; or,

and sending the cross interference information and the information of the transmission node device to which the cell corresponding to the acquired cell identifier belongs to a central node device.

Further, the sending unit 92 is configured to: when the interference measurement configuration information is acquired by the second method, the cross interference information is sent to the central node device according to the following method:

according to the receiving sequence of each measurement pilot frequency configuration information, sequentially sending the cross interference information measured according to each measurement pilot frequency configuration information to a central node device; or,

sending the cross interference information and the received identifier of the measurement pilot frequency configuration information to a central node device; or,

and determining a transmission node device corresponding to the received measurement pilot configuration information according to the preset corresponding relation between the measurement pilot configuration information and the transmission node device, and sending the cross interference information and the determined information of the transmission node device to the central node device.

Further, the sending unit 92 is configured to: when interference measurement configuration information is acquired by the third method, the cross interference information is sent to the central node device according to the following method:

and sending the cross interference information and the information of the transmission node device corresponding to the received measurement pilot frequency configuration information to a central node device.

Further, the sending unit 92 is configured to: when interference measurement configuration information is acquired by adopting the fourth method, the cross interference information is sent to the central node device according to the following method:

sending the cross interference information and the obtained identifier of the measurement pilot frequency configuration information to a central node device; or,

and sending the cross interference information and the information of other transmission node devices which send the obtained measurement pilot frequency configuration information to a central node device.

Further, the cross interference information is:

load indicator OI information carrying cross-interference strength information, or

Information indicating the strength of cross interference, or

Reference signal received strength RSRP information, or

Coupling loss information.

Further, the measurement pilot configuration information includes: sequence information, configuration information, period information, and starting subframe information;

the sequence information indicates a measured pilot sequence; the configuration information indicates the resource element RE position within one physical resource block PRB at the time of measurement; the period information indicates a measured time period; the starting subframe information indicates a subframe where measurement starts.

Further, the measurement pilot configuration information further includes: one or more of antenna port information, transmission power information, frequency point and bandwidth information;

the antenna port information indicates the antenna port where the pilot frequency sequence is located; the transmission power information indicates the transmission power of a pilot sequence; and the frequency point and the bandwidth where the frequency point and the bandwidth information are measured.

Referring to fig. 10, an embodiment of the present invention provides a transmission node apparatus, including:

a receiving unit 101, configured to receive cross interference information sent by another transmission node apparatus;

an interference control unit 102, configured to perform power control or adjust uplink and downlink configuration according to the cross interference information, so as to reduce cross interference strength of the transmission node apparatus to other transmission node apparatuses.

Further, the apparatus further comprises:

a sending unit 103, configured to send measurement pilot configuration information corresponding to itself to another transmission node apparatus before receiving cross interference information sent by the other transmission node apparatus.

Still referring to fig. 10, an embodiment of the present invention provides a central node apparatus, including:

a receiving unit 101, configured to receive cross interference information sent by a transmission node apparatus;

an interference control unit 102, configured to instruct one or more transmission node devices to perform power control or adjust uplink and downlink configuration according to the cross interference information, so as to reduce cross interference strength between the transmission node devices.

Further, the apparatus further comprises:

a sending unit 103, configured to send interference measurement configuration information to the transmission node apparatus before receiving the cross interference information sent by the transmission node apparatus.

Further, the interference measurement configuration information includes measurement pilot configuration information; or,

the interference measurement configuration information includes measurement pilot configuration information and information of a transmission node device corresponding to the measurement pilot configuration information.

In conclusion, the beneficial effects of the invention include:

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

1. A method for feeding back interference information, the method comprising:

2. The method of claim 1, wherein the transmitting node apparatus obtaining the interference measurement configuration information specifically comprises one of:

the second method comprises the following steps: the transmission node device receives measurement pilot frequency configuration information sent by the central node device, and takes the received measurement pilot frequency configuration information as interference measurement configuration information;

3. The method of claim 2, wherein the transmitting node apparatus sending the cross interference information to other transmitting node apparatuses, specifically comprising:

when the transmission node device acquires interference measurement configuration information by adopting the first method, the transmission node device sends the cross interference information to the transmission node device to which the cell corresponding to the acquired cell identifier belongs; or,

when the transmission node device acquires interference measurement configuration information by adopting the second method, the transmission node device determines the transmission node device corresponding to the received measurement pilot configuration information according to the preset corresponding relation between the measurement pilot configuration information and the transmission node device, and sends the cross interference information to the determined transmission node device; or,

when the transmission node device acquires interference measurement configuration information by adopting the third method, the transmission node device sends the cross interference information to the transmission node device corresponding to the received measurement pilot frequency configuration information; or,

when the transmission node device acquires the interference measurement configuration information by using the method four, the transmission node device sends the cross interference information to other transmission node devices corresponding to the acquired measurement pilot frequency configuration information.

4. The method of claim 2, wherein when the transmission node apparatus acquires the interference measurement configuration information by using the first method, the transmission node apparatus sends the cross interference information to the central node apparatus, and specifically includes:

the transmission node device sends the cross interference information and the corresponding measurement pilot frequency configuration information identification to a central node device; or,

and the transmission node device sends the cross interference information and the information of the transmission node device to which the cell corresponding to the acquired cell identifier belongs to a central node device.

5. The method of claim 2, wherein when the transmission node apparatus acquires the interference measurement configuration information by using the second method, the transmission node apparatus sends the cross interference information to the central node apparatus, and specifically includes:

the transmission node device sends the cross interference information and the received identification of the measurement pilot frequency configuration information to a central node device; or,

the transmission node device determines the transmission node device corresponding to the received measurement pilot configuration information according to the preset corresponding relation between the measurement pilot configuration information and the transmission node device, and sends the cross interference information and the determined information of the transmission node device to the central node device.

6. The method of claim 2, wherein when the transmission node apparatus acquires the interference measurement configuration information by using the method three, the transmission node apparatus sends the cross interference information to the central node apparatus, and specifically includes:

7. The method of claim 2, wherein when the transmission node apparatus acquires the interference measurement configuration information by using the method four, the transmission node apparatus sends the cross interference information to the center node apparatus, and specifically includes:

the transmission node device sends the cross interference information and the obtained identification of the measurement pilot frequency configuration information to a central node device; or,

the transmission node device transmits the cross interference information and information of other transmission node devices transmitting the obtained measurement pilot configuration information to the center node device.

8. The method of any of claims 1-7, wherein the cross interference information is:

Information indicating the strength of cross interference, or

Reference signal received strength RSRP information, or

Coupling loss information.

9. The method of any of claims 2-7, wherein the measurement pilot configuration information comprises: sequence information, configuration information, period information, and starting subframe information;

10. The method of claim 9, wherein the measurement pilot configuration information further comprises: one or more of antenna port information, transmission power information, frequency point and bandwidth information;

11. An interference control method, comprising:

12. The method of claim 11, further comprising:

before the transmission node device receives the cross interference information sent by other transmission node devices, the transmission node device sends the corresponding measurement pilot configuration information to other transmission node devices.

13. An interference control method, comprising:

14. The method of claim 13, further comprising:

before the central node device receives the cross interference information sent by the transmission node device, the central node device sends interference measurement configuration information to the transmission node device.

15. The method of claim 14, wherein the interference measurement configuration information comprises measurement pilot configuration information; or,

16. A transmission node apparatus, characterized in that the apparatus comprises:

17. The apparatus of claim 16, wherein the obtaining unit is to: obtaining interference measurement configuration information according to one of the following methods:

18. The apparatus of claim 17, wherein the sending unit is to: transmitting the cross interference information to other transmission node devices according to the following method:

19. The apparatus of claim 17, wherein the sending unit is to: when the interference measurement configuration information is acquired by adopting the first method, the cross interference information is sent to the central node device according to the following method:

20. The apparatus of claim 17, wherein the sending unit is to: when the interference measurement configuration information is acquired by the second method, the cross interference information is sent to the central node device according to the following method:

21. The apparatus of claim 17, wherein the sending unit is to: when interference measurement configuration information is acquired by the third method, the cross interference information is sent to the central node device according to the following method:

22. The apparatus of claim 17, wherein the sending unit is to: when interference measurement configuration information is acquired by adopting the fourth method, the cross interference information is sent to the central node device according to the following method:

23. The apparatus of any of claims 16-22, wherein the cross interference information is:

Information indicating the strength of cross interference, or

Reference signal received strength RSRP information, or

Coupling loss information.

24. The apparatus of any of claims 17-22, wherein the measurement pilot configuration information comprises: sequence information, configuration information, period information, and starting subframe information;

25. The apparatus of claim 24, wherein the measurement pilot configuration information further comprises: one or more of antenna port information, transmission power information, frequency point and bandwidth information;

26. A transmission node apparatus, characterized in that the apparatus comprises:

27. The apparatus of claim 26, further comprising:

and the sending unit is used for sending the measurement pilot frequency configuration information corresponding to the sending unit to other transmission node devices before receiving the cross interference information sent by other transmission node devices.

28. A central node apparatus, comprising:

29. The apparatus of claim 28, further comprising:

a sending unit, configured to send the interference measurement configuration information to the transmission node apparatus before receiving the cross interference information sent by the transmission node apparatus.

30. The apparatus of claim 29, wherein the interference measurement configuration information comprises measurement pilot configuration information; or,