CN115551083A

CN115551083A - Method for receiving downlink control information, method for sending information and related device

Info

Publication number: CN115551083A
Application number: CN202110727996.6A
Authority: CN
Inventors: 邓云
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-12-30
Also published as: WO2023273935A1

Abstract

The embodiment of the application provides a method for receiving downlink control information, a method for sending the downlink control information and a related device, wherein the method for receiving the downlink control information comprises the following steps: the method comprises the steps that user equipment receives first indication information sent by network equipment, the first indication information indicates that transmission state identification of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1; the UE takes any one of the N candidate reference signals as the transmission state identifier of the control resource set; the user equipment receives first downlink control information from the control resource set according to the transmission state identification of the control resource set. In the method provided by the embodiment of the application, the user equipment receives N candidate reference signals indicated by the first indication information sent by the network equipment, and then selects any one of the reference signals as the transmission state identifier for controlling the resource set, so that the downlink control information is received, and the purpose of reducing the resource overhead for receiving the downlink control information is achieved.

Description

Method for receiving downlink control information, method for sending information and related device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a method for receiving downlink control information, a method for sending the information and a related device.

Background

A New Radio (NR) system introduces a multicast mechanism (PTM). In order to transmit data with high reliability by using a multicast mechanism, a user equipment receiving the multicast needs to be in a Radio Resource Control (RRC) connected state.

After the ue accesses the serving cell and establishes an RRC connection, it needs to receive Downlink Control Information (DCI) from a Common Search Space (CSS) of a control resource set (core set) in the serving cell, where multicast service is developed, so as to receive multicast data indicated by the DCI.

How to receive downlink control information with less resource overhead is a direction of continuous effort of researchers in the field.

Disclosure of Invention

The embodiment of the application provides a receiving method of downlink control information, a sending method of the downlink control information and a related device, and aims to reduce resource overhead of receiving the downlink control information.

In a first aspect, an embodiment of the present application discloses a method for receiving downlink control information, where the method includes:

user equipment receives first indication information sent by network equipment, wherein the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1;

the ue uses any one of the N candidate reference signals as the transmission status indicator of the control resource set;

and the user equipment receives first downlink control information from the control resource set according to the transmission state identifier of the control resource set.

The method for receiving downlink control information provided in the embodiment of the present application may be applied to user equipment, and the user equipment may be understood as equipment capable of performing data processing and network communication. For example, the user device may include a mobile phone, a portable notebook or a tablet computer, and the like, which is not limited in this application.

The first indication information may be understood as information indicating one or more reference signals for receiving downlink control information, i.e. indicating that the control resource set and the N candidate reference signals are gaussian co-existing QCLs. Since N candidate reference signals are not simultaneously transmitted by the serving cell, the set of control resources is gaussian-co-existing with the N candidate reference signals respectively at different time periods.

Any one of the N candidate reference signals may be understood as a signal that enables a certain ue to receive the first downlink control information, but for different ues, the ue is actually located in different beam coverage areas of the serving cell, and the signal strengths of the N candidate reference signals measured by the ue may be different.

In the method for receiving downlink control information provided by the embodiment of the present application, a user equipment receives first indication information sent by a network device, where the first indication information indicates N candidate reference signals, and N is an integer greater than or equal to 1; when the user equipment needs to update the signal for receiving the downlink control information, any reference signal in the N candidate reference signals is automatically selected as the transmission state identifier for controlling the resource set, so that the downlink control information is received, and the aim of reducing the resource overhead for receiving the downlink control information is fulfilled.

In a possible implementation manner, the ue receives the first downlink control information according to a signal with better signal quality in the N candidate reference signals. For example, the ue may perform signal strength detection on signals in the N candidate reference signals in a current serving cell, and receive the first downlink control information by using a signal with better signal quality.

It is to be understood that the signals other than the signals with the signal quality lower than or equal to the threshold value among the N candidates may be understood as the signals with better signal quality.

In a possible implementation manner, in a case that the N is 1, the first indication information is transmitted in a multicast manner; when N is an integer greater than or equal to 2, the first indication information is transmitted by unicast or multicast.

Under the condition that the first indication information indicates that the transmission state identifier of the control resource set corresponds to 1 candidate reference signal, the first indication information is transmitted in a multicast mode; and transmitting the first indication information in a unicast or multicast mode when the first indication information indicates that the transmission status identifier of the control resource set corresponds to 2 or more candidate reference signals. Compared with the method that when the signal for receiving the downlink control information needs to be updated, the method indicates a certain signal to the user equipment in a unicast mode to receive the downlink control information, the method can reduce the resource overhead.

In a possible implementation manner, the ue using any reference signal in the N candidate reference signals as the transmission status indicator of the control resource set includes:

at a first time, the ue uses a first reference signal of the N candidate reference signals as a transmission status indicator of the control resource set;

the method further comprises the following steps: at a second time, the ue uses a second reference signal of the N candidate reference signals as a transmission status indicator of the control resource set; the first reference signal and the second reference signal are different signals of the N candidate reference signals;

and the user equipment receives second downlink control information from the control resource set according to the transmission state identifier of the control resource set.

the ue uses a reference signal with the best signal quality among the N candidate reference signals as the transmission status flag of the control resource set; or,

the UE takes one reference signal of the N candidate reference signals, the signal quality of which exceeds a first threshold value, as the transmission state identifier of the control resource set; or,

and under the condition that the signal quality of the N candidate reference signals is lower than a second threshold, the UE selects any one of the candidate reference signals as the transmission state identifier of the control resource set.

In a possible implementation manner, the ue receives second indication information sent by the network device, where the second indication information indicates that the transmission status identifier of the control resource set corresponds to K candidate reference signals, where K is an integer greater than or equal to 1, and the K candidate reference signals are partially the same as or completely different from the N candidate reference signals.

In one possible implementation, the method further includes:

when the signal quality of the N candidate reference signals is lower than a third threshold, the ue sends third indication information to the network device; the third indication information indicates that the signal quality of the N candidate reference signals is lower than a threshold.

In a possible implementation manner, the third indication information includes Y signals with better signal quality for receiving downlink control information in a serving cell where the ue is currently located, where Y is an integer greater than or equal to 1.

In one possible implementation, the method further includes:

when the ue receives, at the same time, fourth indication information sent by the network device in a multicast manner and fifth indication information sent by the network device in a unicast manner, the ue uses a reference signal indicated by the fifth indication information as a transmission status identifier of the control resource set; the fourth indication information indicates that the transmission status identifier of the control resource set corresponds to two or more reference signals; the fifth indication information indicates that the transmission status indicator of the control resource set corresponds to a reference signal.

In a possible implementation manner, the receiving, by the ue, first downlink control information according to a signal with better signal quality in the N candidate reference signals includes:

and the UE receives first downlink control information according to the signal with the best signal quality in the N candidate reference signals.

the UE receives first downlink control information according to signals which have better signal quality and are contained in the N candidate reference signals in the M candidate reference signals; the M candidate reference signals are signals in a serving cell where the ue is currently located, and M is an integer greater than or equal to 1.

In the implementation mode, the user equipment directly detects the signal of the current serving cell to obtain M candidate reference signals; then, the ue receives first downlink control information according to a signal which has a better signal quality among the M candidate reference signals and is included in the N candidate reference signals.

In a possible implementation manner, the M candidate reference signals are signals used for receiving downlink control information in a serving cell where the ue is currently located.

In a second aspect, an embodiment of the present application discloses a method for sending information, where the method includes:

the network equipment sends first indication information to user equipment, wherein the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals; any one of the N candidate signals may be used for the ue to receive first downlink control information, where N is an integer greater than or equal to 1;

the network device transmits the first downlink control information to the user equipment.

The information sending method provided by the embodiment of the application can be applied to network equipment, and the network equipment can be understood as equipment capable of performing data processing and network communication. The network device may include, for example, a base station or an access device of a network, and the like, which is not limited in this application.

In the information sending method provided by the embodiment of the application, a network device sends first indication information to a user, where the first indication information indicates N candidate reference signals, and N is an integer greater than or equal to 1; since any one of the N candidate signals can be used for the ue to receive the first downlink control information, that is, the ue can receive the first downlink control information through any one of the N candidate reference signals, so that when the ue needs to update the signal for receiving the downlink control information, the ue automatically selects any one of the N candidate reference signals as the transmission status identifier for controlling the resource set, thereby receiving the downlink control information and achieving the purpose of reducing the resource overhead for receiving the downlink control information; meanwhile, the resource overhead of the network equipment in the process of sending the signal for the user equipment to receive the downlink control information is reduced.

In one possible implementation manner, the first indication information is transmitted by a unicast or multicast manner.

In one possible implementation, the method further includes:

the network device sends second indication information to the user equipment, wherein the second indication information indicates that the transmission state identifier of the control resource set corresponds to K candidate reference signals; k is an integer greater than or equal to 1; the K candidate reference signals are partially identical to or completely different from the N candidate reference signals.

In one possible implementation, the method further includes: the network device receives third indication information sent by the user equipment, where the third indication information indicates that signal quality of the N candidate reference signals is lower than a threshold.

In a possible implementation manner, the third indication information includes Y signals with better signal quality, where Y is an integer greater than or equal to 1, in a serving cell where the ue is currently located.

In a third aspect, an embodiment of the present application discloses a user equipment, including:

a receiving unit, configured to receive first indication information sent by a network device, where the first indication information indicates that a transmission status identifier of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1;

a determining unit, configured to use any reference signal in the N candidate reference signals as the transmission status identifier of the control resource set;

a receiving unit, configured to receive first downlink control information from the control resource set according to the transmission status identifier of the control resource set.

In a possible implementation manner, the determining unit is specifically configured to use a first reference signal of the N candidate reference signals as a transmission state identifier of the control resource set at a first time;

the determining unit is further configured to use a second reference signal of the N candidate reference signals as a transmission status indicator of the control resource set at a second time; the first reference signal and the second reference signal are different signals of the N candidate reference signals;

the receiving unit is further configured to receive second downlink control information from the control resource set according to the transmission status identifier of the control resource set.

In a possible implementation manner, the determining unit is specifically configured to use a reference signal with the best signal quality in the N candidate reference signals as the transmission state identifier of the control resource set; or,

the determining unit is specifically configured to use one reference signal of the N candidate reference signals whose signal quality exceeds a first threshold as the transmission state identifier of the control resource set; or,

the determining unit is specifically configured to select any candidate reference signal as the transmission state indicator of the control resource set when the signal quality of the N candidate reference signals is lower than a second threshold.

In a possible implementation manner, the receiving unit is further configured to receive second indication information sent by the network device, where the second indication information indicates that the transmission status indicator of the control resource set corresponds to K candidate reference signals, where K is an integer greater than or equal to 1, and the K candidate reference signals are partially the same as or completely different from the N candidate reference signals.

In a possible implementation manner, the ue further includes a sending unit, configured to send third indication information to the network device when the signal quality of the N candidate reference signals is lower than a third threshold; the third indication information indicates that the signal quality of the N candidate reference signals is lower than a threshold.

In a possible implementation manner, the determining unit is further configured to, when the user equipment simultaneously receives fourth indication information sent by the network device in a multicast manner and fifth indication information sent by the network device in a unicast manner, use a reference signal indicated by the fifth indication information as a transmission state identifier of the control resource set; the fourth indication information indicates that the transmission status identifier of the control resource set corresponds to two or more reference signals; the fifth indication information indicates that the transmission status indicator of the control resource set corresponds to a reference signal.

In a fourth aspect, an embodiment of the present application discloses a network device, including:

a generating unit configured to generate first indication information;

a sending unit, configured to send first indication information to a user equipment, where the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals; any one of the N candidate signals may be used for the ue to receive first downlink control information, where N is an integer greater than or equal to 1;

the sending unit is further configured to send the first downlink control information to the user equipment.

In a possible implementation manner, the first indication information is transmitted by a unicast or multicast manner.

In a possible implementation manner, the sending unit is further configured to send second indication information to the ue, where the second indication information indicates that the transmission status identifier of the control resource set corresponds to K candidate reference signals; k is an integer greater than or equal to 1; the K candidate reference signals are partially identical to or completely different from the N candidate reference signals.

In a possible implementation manner, the network device further includes a receiving unit, configured to receive third indication information sent by the user equipment, where the third indication information indicates that signal quality of the N candidate reference signals is lower than a threshold.

In a fifth aspect, an embodiment of the present application discloses a user equipment, including: a processor and a transceiver;

the transceiver is used for receiving signals or sending signals; the processor is configured to execute computer-executable instructions stored in the memory to cause the user equipment to perform the method according to the first aspect or any one of the possible implementation manners of the first aspect.

In a sixth aspect, an embodiment of the present application discloses a network device, including: a processor and a transceiver;

the transceiver is used for receiving signals or sending signals; the processor is configured to execute computer-executable instructions stored in the memory to cause the network device to perform the method according to the second aspect or any one of the possible embodiments of the second aspect.

In a seventh aspect, an embodiment of the present application discloses a computer-readable storage medium, where a computer program is stored, and when the computer program runs on one or more processors, the method in the first aspect or any one of the possible implementations of the first aspect is executed; alternatively, the computer program as described above, when run on one or more processors, causes a method as in the second aspect or any one of the possible embodiments of the second aspect to be performed.

In an eighth aspect, the present application provides a computer program product, where the computer program product includes program instructions, where the program instructions, when executed by a processor, cause the processor to perform the method as in the first aspect or any one of the possible implementations of the first aspect; alternatively, the program instructions may, when executed by a processor, cause the processor to perform a method as in the second aspect or any one of the possible embodiments of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings used in the embodiments or the background art of the present application will be briefly described below.

Fig. 1 is a beam pattern provided by an embodiment of the present application;

fig. 2 is a schematic diagram of a format of a MAC CE according to an embodiment of the present application;

FIG. 3 is a schematic view of a scenario provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of another scenario provided by an embodiment of the present application;

fig. 5 is a flowchart illustrating a method for receiving downlink control information according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The terminology used in the following examples of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the listed items. The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order.

In order to more clearly describe the solution of the present application, some knowledge related to the embodiments of the present application is introduced below.

1. Terminology of the technology

1.1, channels

A channel is a signal channel based on a transmission medium, and different types of information need to be subjected to different processing procedures. For example, the source information of the transmitting end is first processed by the network layer, the data link layer, and the physical layer, then transmitted to the receiving end through the wireless environment, and finally processed by the physical layer, the data link layer, and the network layer, which is the channel.

In the new wireless system, channels are divided into logical channels, transport channels, and physical channels. The physical channel is a channel for actually transmitting information in the physical layer, the transport channel is a channel between the physical layer and a Medium Access Control (MAC) sublayer, and the logical channel is a channel between the MAC sublayer and a Radio Link Control (RLC) sublayer.

Each channel may be divided into a plurality of categories of channels according to their different roles. For example, the physical channel may be divided into an uplink channel and a downlink channel. The uplink channel includes a Physical Uplink Shared Channel (PUSCH) and the like. The downlink channel includes a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH), and the like. Wherein:

the PDSCH carries downlink traffic data of a user and provides a service to User Equipment (UE).

The PDCCH carries control information (DCI) for resource allocation used to transmit user data, and the DCI mainly includes PDSCH and PUSCH transmission resource scheduling information, an uplink power control instruction, a slot format instruction, and the like. The PDCCH dynamically sends downlink control information to the user equipment, which knows when (time domain) and where (frequency domain) to demodulate the PDSCH and when and where to assemble and send PUSCH data in what manner by reading the downlink control information.

1.2 Bandwidth part (BWP)

In a Long Term Evolution (LTE) system, the maximum transmission bandwidth is 20MHz. In general, LTE can support multiple operating bandwidths, e.g., 5MHz, 10MHz, 20MHz. Accordingly, the user equipment needs to support a maximum transmission bandwidth (i.e., 20 MHz).

When the maximum transmission bandwidth supported by the new wireless system is 400MHz, if the ue uses the LTE scheme, that is, each ue supports the maximum transmission bandwidth (i.e., 400 MHz), the requirement on the radio frequency performance of the ue is too high, it is difficult to integrate the chip, and the cost is high.

For the above situation, a Bandwidth Adaptation (BA) technique may be used to adapt and adjust the working bandwidth transmitted and received by the ue. The bandwidth part is a subset of the total bandwidth of the cell, and the same user equipment can work in different bandwidth parts at different time.

1.3 control resource set (CORESET) and search space (search space)

In the LTE system, the PDCCH occupies the entire frequency band of the serving cell in the frequency domain, and occupies the first 1 to 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols of each subframe in the time domain. That is, the LTE system only needs to notify the user equipment of the number of OFDM symbols occupied by the PDCCH, and the user equipment can determine the search space of the PDCCH.

In a new wireless system, due to the large bandwidth (400 MHz) of the system and the difference of the demodulation capability of the terminal, in order to improve the resource utilization rate, the PDCCH does not occupy the whole bandwidth in the frequency domain; in addition, in order to increase the flexibility of the system to adapt to different scenarios, the starting position of the PDCCH in the time domain may also be configurable. That is, the user equipment must know the location of the PDCCH in the frequency domain and the location in the time domain in order to further demodulate the PDCCH.

For convenience, the new wireless system packages information such as frequency bands occupied on a PDCCH frequency domain and OFDM symbol number occupied on a time domain in a control resource set; and packaging information such as the PDCCH initial OFDM symbol number, the PDCCH monitoring period and the like in a search space. Wherein:

the control resource set is a set of physical resources in a specific region in a downlink resource grid, and is used for carrying the PDCCH. The control resource set corresponds to the search space through parameter configuration. Illustratively, the control resource set contains a field CORESET ID, which is used to correspond to the search space.

The search space is divided into a Common Search Space (CSS) and a user equipment specific search space (USS). The common search space is mainly used when the user equipment accesses the cell and performs cell switching, the common search space is also used for paging and DCI transmission corresponding to system information, and the specific search space of the user equipment is used after the user equipment is accessed. Search spaces can be divided into various types according to their different uses. For example, a search space of Type0-PDCCH in the common search space is used for system information block 1 (SIB 1) scheduling.

The corresponding relation between the control resource set and the search space is as follows: one control resource set may correspond to multiple search spaces, but one search space may correspond to only one control resource set. Meanwhile, the user equipment can determine the specific time-frequency domain position of the PDCCH by combining the control resource set and the parameters in the search space.

1.4 Beam scanning (beam sweeping)

Since the new wireless system is deployed by using high frequency (e.g. 6000 MHz) signals, and the wireless signals have the characteristics of good directivity and large path loss at high frequency, one beam can only cover a limited range. Thus, in new wireless systems, only a small cell (cell) may contain only one beam, and a large cell typically requires multiple beams (beams) to achieve full coverage. For example, referring to fig. 1, fig. 1 is a beam pattern provided in an embodiment of the present application. For a cell consisting of multiple beams (e.g., beam 1 through beam 8 shown in fig. 1), all beams cannot be transmitted at the same time due to hardware limitations.

In view of the above situation, the new wireless system adopts a beam forming (beam forming) transmission manner to increase the coverage distance of the wireless signal. In addition, since each beam covers a limited angle, the new wireless system covers the service range of the whole cell by a beam scanning (beam scanning) manner. Beam scanning is to transmit physical channels or reference signals by using beams in different directions at different times, so as to realize time-sharing transmission of different beams.

1.5 Synchronization Signal Block (SSB)

For a certain cell in a new radio, the synchronization signal is transmitted according to a certain period (such as 20ms, 40ms, or 80 ms) with 5ms as a duration. The synchronization signals include a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

In new wireless systems, a Synchronization Signal Block (SSB) is the smallest synchronization unit. The base station can flexibly configure the number of the synchronous signal blocks and the positions of the synchronous signal blocks in the time domain and the frequency domain according to the transmission requirement.

Illustratively, one cell may transmit one or more synchronization signal blocks (i.e., different beams). For example, cell a transmits 4 synchronization signal blocks SSB, respectively SSB0, SSB1, SSB2, and SSB3; cell B transmits 8 synchronization signal blocks, i.e. from SSB0 to SSB7. For cells less than or equal to 8 synchronization signal blocks, the user equipment may determine the index of the synchronization signal block by detecting a demodulation reference signal (DM-RS) of the physical broadcast channel.

The synchronization signal block includes a primary synchronization signal and a secondary synchronization signal and a Physical Broadcast Channel (PBCH). Wherein:

the primary synchronization signal and the secondary synchronization signal are used to enable the user equipment to recognize a cell identity and to enable the user equipment to obtain symbol-level synchronization.

The PBCH carries system parameters of a Radio Resource Control (RRC) layer, other important parameters required for completing frame synchronization, and parameters required for further decoding other physical channels.

Specifically, the PBCH contains a Master Information Block (MIB). The master information block includes a field PDCCH-configSIB1 configuring parameters required for decoding a PDCCH corresponding to the system information block 1 (system information block 1, sib1).

2. Process for user equipment to access new wireless access system

In the new radio access system, the base station may configure the ue in one or more control resource sets, and detect DCI belonging to the ue according to a Radio Network Temporary Identifier (RNTI). For example, for a scenario without considering carrier aggregation, the ue operates on one carrier, and the base station may configure the ue to detect search spaces in one or more control resource sets on the carrier, detect (e.g., blind detect) DCI belonging to the ue according to its radio network temporary identifier, and then receive data or upload data according to the DCI.

In particular, one user equipment may have one or more radio network temporary identities RNTI.

Specifically, for each control resource set, the user equipment needs to know a transmission status identifier (TCI) status indicator of the control resource set first when detecting DCI.

For the same set of control resources, the user equipment may detect DCI located in the common search space and the user equipment-specific search space through different detection periods. That is, the ue may not need to detect the DCI scrambled by the RNTI in a certain search space every slot, and the network may configure the ue to detect the DCI in a certain search space periodically. The number of potential DCIs that the user equipment needs to detect may be one or more for each search space, and thus each search space may be represented by a set of search spaces.

In R15 (Release 15), the maximum number of control resource sets that can be configured on one active bandwidth part may be 3; the maximum number of sets of search spaces may be 10. Thus, there may be more than 3 sets of search spaces in a control resource set.

For a user equipment initially accessing a serving cell and needing to establish an RRC connection, system messages need to be obtained from the initial bandwidth portion of the cell. Here, the system message block 1 (i.e. SIB 1) is carried by the PDSCH, so the ue needs to know the scheduling information of the PDSCH to receive or decode the SIB1, that is, the ue needs to monitor the PDCCH carrying the PDSCH scheduling information (which may be understood as the PDCCH corresponding to SIB 1).

The search space of the PDCCH corresponding to SIB1 is a common search space, the type of which is type0-PDCCH CSS, and the associated control resource set of which is CORESET0.

Wherein, core set0 can be understood as a first control resource set, and the information thereof belongs to a part of the configuration information of the initial bandwidth part. As described earlier (synchronization signal block part), the PBCH in the synchronization signal block includes a Master Information Block (MIB), which encapsulates necessary resources for initial access. Specifically, the MIB includes a field PDCCH-configSIB1 that configures data of a PDCCH corresponding to the decoding SIB 1: CORESET0 and Type0-PDCCH CSS.

The process of the user equipment accessing the cell and establishing RRC connection comprises the following steps:

first, the user equipment obtains the system message from the initial bandwidth portion of the cell, i.e. the user equipment detects the synchronization signal block of the cell located on the initial bandwidth portion. The synchronization signal block includes a primary synchronization signal, a secondary synchronization signal, and a physical broadcast channel. The physical broadcast channel carries MIB, which includes configuration information of a control resource set of SIB1 detected by the ue, i.e. CORESET0.

The user equipment can obtain a search space for detecting SIB1, i.e., type0-PDCCHCSS, through CORESET0, and the search space is mapped to CORESET0. Further, the user equipment may obtain other information, such as random access configuration, common PDSCH configuration, radio network identification, etc., through SIB 1. The SIB1 may configure a control resource set (e.g., CORESET 1) for the ue to receive the paging message and the random access response, and a search space set mapped to the paging message on the CORESET1 and a search space set for the random access. If the paging message and the core set1 of the random access response are not configured in the SIB1, the ue may detect the control resource set corresponding to the SIB1 to obtain the above information.

When the user equipment needs to establish RRC connection, a synchronization signal block exceeding a threshold in the signal power detected by the cell may be selected. For example, the cell has synchronization signal blocks SSB0 to SSB7. The user equipment finds that the synchronization signal block of the cell exceeding the threshold has SSB4 and SSB5, and the user equipment can select SSB5.

Then, the user equipment determines the random access resource corresponding to the SSB5 according to the system message and initiates a random access procedure. At this time, the user equipment adopts the SSB5 as a transmission state identifier of the CORESET0 or CORESET1 (the CORESET1 network may not be configured).

In the above case, the ue considers that CORESET0 and SSB5 are gaussian-co-located (QCL), that is, some channel estimation information obtained by the ue through detecting the SSB5, such as delay spread, doppler shift, etc., can be used to receive CORESET0. And the user equipment receives the random access response according to the search space set configured with the random access in the system message. And then, further obtaining uplink authorization through the random access response, and sending a Radio Resource Control (RRC) request to the base station.

And after receiving the request, the base station allocates resources for the user equipment and sends RRC establishment to the user equipment. And after receiving the RRC establishment, the user equipment sends RRC establishment completion to the base station by using the resources configured by the base station. Thereafter, the user equipment enters the RRC connected state.

After the user equipment enters the connected state, the interaction between the base station and the user equipment may include:

(1) The base station can configure other control resource sets for the user equipment based on the capability of the user equipment and the service requirement, and the search space mapped on the other control resource sets.

(2) The base station may switch the user equipment from an initial bandwidth part (initial bwp) to another bandwidth part through downlink control information.

(3) The base station can configure other bandwidth parts of the cell for the user equipment, and control resource sets located on the other bandwidth parts, and the like.

Accordingly, the user equipment can acquire RRC information, thereby switching a bandwidth part, acquiring a plurality of control resource set resources, and the like.

For other control resource sets, the base station may modify the transmission state identifier of the control resource set by sending a specific MAC layer control element (MAC ce) to the ue.

For example, the base station may modify the transmission status identifier to be a specific channel status information-reference signal (CSI-RS), that is, the control resource set and the CSI-RS are gaussian and coexist, and the ue receives the corresponding control resource set through the CSI-RS; alternatively, the base station may modify the transmission status flag to be a synchronization signal block, that is, the control resource set and the synchronization signal block coexist in gaussian, and the ue receives the corresponding control resource set through the synchronization signal block.

In short, the base station modifies the transmission state identifier of the control resource set through the MACCE, so that the user equipment can receive the control resource set resource through a correct reference signal (that is, assist in analyzing the PDCCH on the control resource set by using the channel estimation information of the reference signal), and further acquire the DCI.

Exemplarily, fig. 2 is a schematic diagram of a format of a mac ce provided in an embodiment of the present application. As shown in fig. 2, the mac ce may indicate a serving cell Identification (ID), a control resource set identification (coreset ID), and a transmission state identification in two bytes (octet, oct).

After the signaling radio bearer is established between the user equipment and the base station and the user equipment completes the activation of the security mode, the base station may establish a data radio bearer with the user equipment so that the user equipment may conduct a service.

3. Multicast mechanism (Point to multicast, PTM)

New wireless systems introduce multicast mechanisms. In order to transmit data with high reliability by using a multicast mechanism, a user equipment receiving multicast needs to be in an RRC connected state.

After the multiple user equipments access the serving cell and establish RRC connections respectively, the user equipments may learn from the system message of the cell that the cell supports the multicast service, and then the user equipments may indicate to the serving cell that they expect to perform the multicast service.

Specifically, the base station is configured to let the user equipments participating in the multicast receive the common search space mapped on the same control resource set, and receive DCI from the common search space, thereby receiving the multicast data indicated by the DCI. In particular, for ease of understanding, the set of control resources is represented by CORESETX, which may take an integer greater than or equal to 1.

When the location of the ue changes and cannot receive coreset x through the reference signal indicated by the original transmission state identifier, the base station needs to send MACCE to each ue that needs to modify the transmission state identifier, so as to modify the transmission state identifier of coreset x. Thus, the ue knows the reference signal (e.g. a SSB or CSI-RS) coexisting with the modified control resource set when receiving DCI from the modified control resource set.

That is to say, the base station needs to send MACCE to each user equipment that needs to modify the transmission state identifier of CORESETX, so that the user equipment knows the reference signal of the QCL, and thus the user equipment can receive the control resource set through the reference signal, and further receive correct DCI.

Exemplarily, fig. 3 is a schematic view of a scenario provided in an embodiment of the present application. As shown in fig. 3, a cell has 8 synchronization signal blocks, which are SSB1 to SSB8 as an example. The cell supports multicast services, and the cell configures a control resource set for receiving the multicast services for the user equipment, and a search space mapped to the control resource set.

For convenience of understanding, the control resource set is referred to as coreset x, and the transmission status flag of coreset x is indicated to the synchronization signal block for example. That is, from the perspective of the ue, coreset x and a certain synchronization signal block coexist in gaussian manner, that is, the ue can receive coreset x and further receive downlink control information by detecting the signal block to obtain information.

As shown in fig. 3, user equipment 1 is located in an area served by SSB3, and user equipment 2 is located in an area served by SSB 4. After a period of time, the user equipment 1 moves from the area served by the SSB3 to the area served by the SSB6, and the user equipment 1 reports the change of the synchronization signal block measured by itself to the cell; when the ue 2 moves from the area served by the SSB4 to the area served by the SSB5, the ue 2 reports the change of the measured sync block to the cell.

It can be understood that when the synchronization signal block measured by the user equipment changes, the synchronization signal block is reported to the base station, so that the base station can adjust the synchronization signal block corresponding to the multicast service according to the synchronization signal block measured by different user equipment, that is, determine which synchronization signal blocks transmit the multicast service in the beam where the synchronization signal blocks are located.

For example, before the ue moves, the cell serves the ue receiving the multicast service inside the cell with SSB1 to SSB4 as a CORESET X gaussian co-existing beam, that is, the ue may receive DCI spreading the multicast service by using any one of SSB1 to SSB4 as a CORESET X gaussian co-existing signal. After the ue moves, according to the information reported by the ue, the CORESET X needs to use any reference signal from SSB5 to SSB8 as a beam with gaussian coexistence to serve the ue receiving the multicast service in the cell.

In the above case, the base station needs to change the transmission status identifiers of the user equipment 1 and the user equipment 2. Specifically, please refer to fig. 4, wherein fig. 4 is a schematic view of another scenario provided in the embodiment of the present application. As shown in part 401 of fig. 4, the base station sends MACCE to the user equipment 1, instructing the user equipment 1 to receive DCI for performing multicast service through the SSB6 (i.e., coreset x uses the SSB6 as a transmission state identifier); as shown in part 402 in fig. 4, the base station sends MACCE to the user equipment 2, instructing the user equipment 2 to receive the DCI for developing the multicast service through the SSB5, so that the user equipment 1 and the user equipment 2 after the location change can receive the DCI for developing the multicast service by detecting the correct synchronization signal block.

It is to be understood that there are typically a plurality of user equipments within a cell receiving multicast data. For example, one serving cell may serve tens or hundreds of user equipments to receive multicast data, and the resource overhead is very large by updating the state of the control resource set by the above method.

In view of the foregoing problems, an embodiment of the present application provides a method for receiving downlink control information. The receiving method of the downlink control information can be applied to user equipment. When the user equipment needs to update the reference signal for receiving the downlink control information, the signal with better signal quality in the plurality of reference signals for receiving the downlink control information sent by the network equipment is automatically selected to receive the downlink control information, so that the resource overhead in the process of receiving the downlink control information is reduced. Accordingly, the embodiment of the present application provides a signal transmission method, which can be applied to a network device. For ease of understanding, the two methods described above will be explained in combination.

Specifically, please refer to fig. 5, where fig. 5 is a flowchart illustrating a method for receiving downlink control information according to an embodiment of the present application. As shown in fig. 5, the method for receiving downlink control information includes:

501: the user equipment receives first indication information sent by the network equipment, wherein the indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1.

The first indication information may be understood as information indicating a plurality of reference signals for receiving downlink control information, i.e. indicating that the control resource set (which may be understood as CORESETX in the foregoing) and N candidate reference signals are gaussian-coexisting QCLs, because the N candidate reference signals are not simultaneously transmitted by the serving cell, and thus the control resource set is gaussian-coexisting with the N candidate reference signals respectively at different time periods.

That is to say, the first indication information sent by the network device may indicate a plurality of reference signals, and any one of the plurality of reference signals may be used for the ue to receive downlink control information. For example, the first indication information may indicate a Synchronization Signal Block (SSB) or a CSI-RS. Illustratively, the first indication information indicates 3 sync signal blocks: SSB1, SSB2, and SSB3, the user equipment may receive the downlink control information with any one of the synchronization signal blocks as long as the signal quality of the SSB detected by the user equipment exceeds a threshold.

The threshold value may be understood as a value that measures the signal quality. It is understood that the threshold may be adjusted according to practical situations, and the application is not limited thereto.

In some embodiments, the first indication information may indicate that the transmission status of the set of control resources identifies identification information corresponding to the N candidate reference signals. Exemplarily, the first indication information may include identification information (SSB index) of SSB1, SSB2, and SSB 3.

Specifically, the network device generates first indication information indicating that the transmission status identifier of the control resource set corresponds to N candidate reference signals, where N is an integer greater than or equal to 1. Then, the network equipment sends the first indication information to the user equipment; accordingly, the user equipment receives the first indication information sent by the network equipment.

It can be understood that the first indication information sent by the network device may be received before the user equipment needs to receive the downlink control information corresponding to the multicast service. For example, after the ue indicates to the serving cell where the ue is located that it desires to perform the multicast service, the ue needs to receive downlink control information corresponding to the multicast service (i.e., schedule transmission of the multicast service through the downlink control information) to receive multicast data; therefore, the user equipment receives the first indication information sent by the network equipment before receiving the downlink control information corresponding to the multicast service.

In some embodiments, the first indication information is transmitted by unicast or multicast.

It is to be understood that, before the user equipment receives the multicast service, possibly while the user equipment is developing unicast (unicast) service, the network device may send the first indication information to the user equipment in a unicast manner, that is, send the first indication information to the user equipment separately through dedicated signaling. For example, the downlink control information scrambled by the cell radio network temporary identifier C-RNTI of the ue transmits the first indication information, where the first indication information is mac ce and is carried on PDSCH, and the downlink control information indicates PDSCH time-frequency resource location carrying the mac ce. After the user equipment receives the multicast service, the network equipment can send first indication information to the user equipment(s) in a multicast mode, the first indication information can be sent through downlink control information (scrambled by a G-RNTI) of scheduling the multicast service, the first indication information is located on PDSCH time-frequency resources where the multicast service is located at the moment, and the network equipment simultaneously transmits multicast data and the first indication information in a multiplexing mode.

502: the UE uses any one of the N candidate reference signals as the transmission state identifier of the control resource set.

Any one of the N candidate reference signals may be understood as a signal that enables a certain user equipment to receive the first downlink control information. Only for different ues, the ues are actually located in different beam coverage areas of the serving cell, and the signal quality of the N candidate reference signals measured by the ues may be different.

In some embodiments, the ue receives the first downlink control information according to a reference signal with better signal quality among the N candidate reference signals. For example, the ue may perform signal quality detection on the N candidate reference signals in the current serving cell, and receive the first downlink control information by using the reference signal with better signal quality, that is, receive the control resource set according to the channel estimation information of the reference signal with better signal quality, and further receive the first downlink control information in the search space mapped on the control resource set.

It is to be understood that the signal quality may be determined by Reference Signal Receiving Power (RSRP), reference Signal Receiving Quality (RSRQ), signal to interference plus noise ratio (SINR), and the like, and the present application is not limited thereto.

It is to be understood that, of the N candidate reference signals, the reference signal whose signal quality exceeds the threshold may be understood as a signal with better signal quality. For example, the first indication information indicates that the transmission status identifier of the control resource set corresponds to 5 candidate reference signals: candidate reference signal a, candidate reference signal B, candidate reference signal C, candidate reference signal D and candidate reference signal E; the user equipment cannot detect the candidate reference signal A in the current serving cell, and the signal quality of the candidate reference signal D in other candidate reference signals is lower than a threshold value; thus, candidate reference signal B, candidate reference signal C, and candidate reference signal E can be understood as reference signals with better signal quality. Therefore, the user equipment selects any one signal from the candidate reference signal B, the candidate reference signal C, and the candidate reference signal E to receive the downlink control information.

Preferably, the ue may select a signal with the best signal quality from the N candidate reference signals to receive the first downlink control information, that is, consider that the transmission status identifier of the control resource set corresponds to the reference signal with the best signal quality, and receive the first downlink control information transmitted on the control resource set by using the reference signal.

503: and the user equipment receives the first downlink control information from the control resource set according to the transmission state identification of the control resource set.

In some embodiments, the receiving, by the ue, the first downlink control information according to a signal with better signal quality in the N candidate reference signals includes:

the user equipment receives first downlink control information according to signals which have better signal quality and are contained in the N candidate reference signals in the M candidate reference signals; the M candidate reference signals are signals in a serving cell where the user equipment is currently located, and M is an integer greater than or equal to 1.

Specifically, the user equipment may directly detect a signal of a serving cell where the user equipment is currently located to obtain M candidate reference signals; then, the ue receives downlink control information according to the signals with better signal quality in the M candidate reference signals and included in the N candidate reference signals.

In some embodiments, the M candidate reference signals are signals capable of being used to receive downlink control information in a serving cell where the candidate reference signals are currently located. Specifically, the ue may directly detect a signal capable of receiving downlink control information in a serving cell where the ue is currently located, to obtain M candidate reference signals; then, the ue receives downlink control information according to the signals with better signal quality in the M candidate reference signals and included in the N candidate reference signals.

In some embodiments, in a case that the signal quality of the N candidate reference signals is lower than the threshold, the ue selects any one of the candidate reference signals as the transmission status indicator of the control resource set, and then receives downlink control information on CORESETX according to the channel estimation information of the selected reference signal.

In some embodiments, the 502, that is, the ue uses any one of the N candidate reference signals as the transmission status indicator of the control resource set, includes:

Specifically, the ue uses different reference signals of the N candidate reference signals as the transmission state identifier of the control resource set CORESET X at different times.

Illustratively, one ue may attempt to resolve the downlink control information on CORESET X at time 1 (which may be understood as the first time) by using one reference signal (which may be understood as the first reference signal) of the N candidate reference signals as the transmission state identifier of CORESET X, but may not be successful, and at this time, may again resolve the downlink control information on CORESET X at the next time (for example, time 2, which may be understood as the second reference signal) by using another reference signal (which may be understood as the second reference signal) of the N candidate reference signals as the transmission state identifier of CORESET X, in this way, the success rate of resolving the downlink control information may be increased.

It can be understood that, in the case that the state between the user equipment and the network device does not change, the user equipment may receive the downlink control information multiple times through a signal of the N candidate reference signals indicated by the first indication information.

In some embodiments, the network device may update the signal used by the current serving cell to receive downlink control information for developing multicast data. That is, after the step 502, that is, after the user equipment receives the first downlink control information according to any one of the N candidate reference signals and further receives the corresponding data, the user equipment may further receive the second indication information of the network device again.

In some embodiments, the ue receives second indication information sent by the network device, where the second indication information indicates that the transmission status identifier of the set of control resources corresponds to K candidate reference signals, and K is an integer greater than or equal to 1.

Specifically, the network device generates second indication information indicating that the transmission status identifier of the control resource set corresponds to K candidate reference signals, where K is an integer greater than or equal to 1. Then, the network equipment sends the second indication information to the user equipment; accordingly, the user equipment receives the second indication information sent by the network equipment.

It is to be understood that the K candidate reference signals are partially the same as or completely different from the N candidate reference signals, and the application is not limited thereto.

It can be understood that, after the network device updates the signal of the downlink control information used by the current serving cell for receiving the multicast data, the network device sends the second indication information to the user equipment, so that the user equipment can receive the downlink control information through a correct signal.

The second indication information may be understood as information indicating a plurality of signals for receiving downlink control information. That is, the second indication information sent by the network device may indicate a plurality of signals, and any one of the plurality of signals may be used for the ue to receive the downlink control information. For example, the second indication information may indicate a Synchronization Signal Block (SSB). Illustratively, the first indication information indicates 3 sync signal blocks: SSB3, SSB4, and SSB5, the user equipment may receive the downlink control information with any one of the synchronization signal blocks as long as the signal quality of the synchronization signal block detected by the user equipment exceeds a threshold.

In some embodiments, the second indication information may include identification information of N candidate reference signals. Illustratively, the first indication information includes identification information (ssbinder) of SSB3, SSB4, and SSB5.

Accordingly, after the network device sends the second indication information to the user equipment, the network device may send the second downlink control information to the user equipment.

In some embodiments, the second indication is transmitted by unicast or multicast.

It can be understood that, when the ue detects that the signal quality in the K candidate reference signals is lower than the threshold in the serving cell, the reference signals are used as the transmission state identifier of CORESETX, and further when receiving the downlink control information on CORESETX, the possibility of failure analysis is high, so that the ue feeds back to the network device through the third indication information, so that the network device indicates the transmission state identifier for receiving the downlink control information for the ue again.

In some embodiments, the third indication information may further include Y reference signals of which the signal quality is better in the serving cell where the user equipment currently locates, where Y is an integer greater than or equal to 1.

Accordingly, after the network device receives the third indication information sent by the user equipment, the network device may reconfigure the reference signal for receiving the second downlink control information for the user equipment. For example, the network device may reconfigure the network device for receiving the second downlink control information into any one of the Y signals, and then transmit indication information to the user equipment to instruct the user equipment to select any one of the Y signals to receive the corresponding downlink control information; or, the network device directly instructs the ue to receive the corresponding downlink control information by using a signal a, where the signal a may be any one of the Y signals, or may be another signal.

In some embodiments, in the case that the user equipment receives the fourth indication information sent by the network device in the multicast manner and the fifth indication information sent by the network device in the unicast manner at the same time, the user equipment uses a reference signal indicated by the fifth indication information as a transmission state identifier of the control resource set CORESET X; the fourth indication information indicates that the transmission status identifier of the control resource set corresponds to two or more reference signals; the fifth indication information indicates that the transmission status flag of the control resource set CORESETX corresponds to a reference signal.

The following describes a specific scenario of a method for receiving downlink control information according to an embodiment of the present application.

Take a scenario in which the ue receives the multicast data by receiving the downlink control information in the new wireless system as an example. As can be known from the foregoing description, in the multicast mechanism of the new wireless system, the network device configures the ue participating in multicast to receive the common search space mapped on the same control resource set, and receive downlink control information from the common search space, so as to receive multicast data indicated by the downlink control information. In particular, for ease of understanding, the set of control resources is represented by CORESETX.

It can be understood that there are various signals (i.e. any one of the above N candidate reference signals) for receiving downlink control information, such as a Synchronization Signal Block (SSB) or CSI-RS, etc., and the example is shown by SSB.

In a new wireless system, a network device sends information (i.e., the first indication information, etc.) to a user equipment through a mac ce to inform the user equipment of downlink control information for receiving multicast data.

Specifically, the method for receiving downlink control information provided in the embodiment of the present application includes:

the network device uniformly indicates to the user devices participating in the multicast to use SSB5, SSB6 and SSB7 to receive the downlink control information through a mac ce.

The MACCE may be understood as the first indication information; SSB5, SSB6 and SSB7 may be understood as the above N candidate reference signals.

Specifically, the network device may transmit the mac ce to the user devices participating in the multicast while transmitting the multicast traffic.

For the user equipment receiving multicast, after acquiring the mac ce, the downlink control information may be received by using the signal having intersection with SSBs 5, 6, and 7 in the strongest SSBs measured by the user equipment.

Alternatively, the user equipment may receive the downlink control information by using the SSB with the best signal quality or the strongest power among the SSBs 5, SSBs 6, and SSBs 7 measured by itself.

Illustratively, the user equipment measures the signal strength of the SSB6 to be the highest, and the user equipment receives the downlink control information according to the SSB 6. Specifically, the ue detects some channel estimation information, such as delay spread, doppler shift, etc., obtained by the SSB6 to be used for receiving coreset x, receives downlink control information from the search space mapped on coreset x, and further receives multicast data through the frequency domain resource indicated by the downlink control information.

The network device can reasonably set the MACCE based on the measurement results of different user devices, and ensure that the user devices receiving the multicast can determine to receive the signals of the downlink control information.

If the signals for receiving the downlink control information obtained by the user equipment through the mac ce are SSB5, SSB6, and SSB7, but the user equipment finds that their signal quality is all below the threshold, that is, the user equipment cannot accurately receive the multicast downlink control information through SSB5, SSB6, and SSB7. At this time, the user equipment may indicate to the network equipment that the signal for receiving the downlink control information is lower than the threshold or needs to be updated. Specifically, the ue may report the measured SSBs in the strongest one or more serving cells to the network device, so that the network device adjusts to receive the downlink control information signal, that is, adjusts the transmission status identifier of CORESETX.

The method of the embodiments of the present application is explained in detail above, and the apparatus of the embodiments of the present application is provided below.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure. As shown in fig. 6, the user equipment 60 includes a receiving unit 601, a determining unit 602, a receiving unit 603, and a transmitting unit 604, and the respective units are described as follows:

a receiving unit 601, configured to receive first indication information sent by a network device, where the first indication information indicates that a transmission status indicator of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1;

a determining unit 602, configured to use any one of the N candidate reference signals as a transmission status indicator of the control resource set;

a receiving unit 603, configured to receive first downlink control information from the control resource set according to the transmission status indicator of the control resource set.

Optionally, the first indication information is transmitted in a unicast or multicast manner.

Optionally, the determining unit 602 is specifically configured to use a first reference signal in the N candidate reference signals as the transmission state identifier of the control resource set at a first time;

the determining unit 602 is further configured to use a second reference signal of the N candidate reference signals as a transmission status indicator of the control resource set at a second time; the first reference signal and the second reference signal are different signals of the N candidate reference signals;

the receiving unit 603 is further configured to receive second downlink control information from the control resource set according to the transmission status identifier of the control resource set.

Optionally, the determining unit 602 is specifically configured to use a reference signal with the best signal quality from the N candidate reference signals as the transmission state identifier of the control resource set; or,

the determining unit 602 is specifically configured to use one of the N candidate reference signals whose signal quality exceeds a first threshold as the transmission status indicator of the control resource set; or,

the determining unit 602 is specifically configured to select any candidate reference signal as the transmission status indicator of the control resource set when the signal quality of the N candidate reference signals is lower than a second threshold.

Optionally, the receiving unit 603 is further configured to receive second indication information sent by the network device, where the second indication information indicates that the transmission status indicator of the control resource set corresponds to K candidate reference signals, where K is an integer greater than or equal to 1, and the K candidate reference signals are partially the same as or completely different from the N candidate reference signals.

Optionally, the ue further includes a sending unit 604, configured to send third indication information to the network device when the signal quality of the N candidate reference signals is lower than a third threshold; the third indication information indicates that the signal quality of the N candidate reference signals is lower than a threshold.

Optionally, the determining unit 602 is further configured to, when the ue receives fourth indication information sent by the network device in a multicast manner and fifth indication information sent by the network device in a unicast manner at the same time, use a reference signal indicated by the fifth indication information as the transmission status flag of the control resource set; the fourth indication information indicates that the transmission status identifier of the control resource set corresponds to two or more reference signals; the fourth indication information indicates that the transmission status indicator of the control resource set corresponds to a reference signal.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present disclosure. As shown in fig. 7, the network device 70 includes a generating unit 701, a transmitting unit 702, and a receiving unit 703, and the description of each unit is as follows:

a generating unit 701 configured to generate first instruction information;

a sending unit 702, configured to send first indication information to a user equipment, where the first indication information indicates that a transmission status identifier of a control resource set corresponds to N candidate reference signals; any one of the N candidate reference signals may be used for the ue to receive first downlink control information, where N is an integer greater than or equal to 1;

the sending unit 702 is further configured to send the first downlink control information to the user equipment.

Optionally, the sending unit 702 is further configured to send second indication information to the ue, where the second indication information indicates that the transmission status identifier of the control resource set corresponds to K candidate reference signals; k is an integer greater than or equal to 1; the K candidate reference signals are partially identical to or completely different from the N candidate reference signals.

Optionally, the network device further includes a receiving unit 703 configured to receive third indication information sent by the ue, where the third indication information indicates that the signal quality of the N candidate reference signals is lower than a threshold.

Optionally, the third indication information includes Y reference signals with better signal quality in a serving cell where the ue is located, where Y is an integer greater than or equal to 1.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. The communication device 80 shown in fig. 8 may be the user equipment 60 or the network equipment 70.

As shown in fig. 8. The communication apparatus 80 comprises at least one processor 802 for implementing the functions of the user equipment in the method provided by the embodiment of the present application; or, the method and the device are used for implementing the functions of the network device in the method provided by the embodiment of the application. The communication device 80 may also include a transceiver 801. The transceiver 801 is used for communication with other devices/apparatuses via a transmission medium. The processor 802 transceives data and/or signaling with the transceiver 801 and is configured to implement the methods in the above-described method embodiments.

Optionally, the communication device 80 may also include at least one memory 803 for storing program instructions and/or data. The memory 803 is coupled to the processor 802. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. The processor 802 may operate in conjunction with a memory 803. The processor 802 may execute program instructions stored in the memory 803. At least one of the at least one memory may be included in the processor.

The specific connection medium among the transceiver 801, the processor 802 and the memory 803 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 803, the processor 802, and the transceiver 801 are connected by the bus 804 in fig. 8, the bus is represented by a thick line in fig. 8, and the connection manner between other components is merely illustrative and not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

In the embodiments of the present application, the processor may be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

It is understood that when the communication device 80 is the user equipment 60 described above, the functions of the receiving unit 601, the determining unit 602, the receiving unit 603, and the transmitting unit 604 are realized. Alternatively, when the communication device 80 is the network device 70, the functions of the generation unit 701, the transmission unit 702, and the reception unit 703 are realized.

The present application also provides a computer-readable storage medium having stored therein computer code which, when run on a computer, causes the computer to perform the method of the above-described embodiment.

The present application also provides a computer program product comprising computer code or a computer program which, when run on a computer, causes the method of the above embodiments to be performed.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the above claims.

Claims

1. A method for receiving downlink control information, the method comprising:

the method comprises the steps that user equipment receives first indication information sent by network equipment, the first indication information indicates that transmission state identification of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1;

the user equipment takes any one of the N candidate reference signals as a transmission state identifier of the control resource set;

2. The method of claim 1, wherein the first indication information is transmitted by unicast or multicast.

3. The method as claimed in claim 1, wherein the ue uses any one of the N candidate reference signals as the transmission status indicator of the control resource set, and comprises:

at a first time, the UE uses a first reference signal of the N candidate reference signals as a transmission state identifier of the control resource set;

the method further comprises the following steps:

at a second time, the ue uses a second reference signal of the N candidate reference signals as a transmission status identifier of the control resource set; the first reference signal and the second reference signal are different signals of the N candidate reference signals;

4. The method of claim 1, wherein the ue uses any one of the N candidate reference signals as the transmission status indicator of the set of control resources, and comprises:

the UE takes the reference signal with the best signal quality in the N candidate reference signals as the transmission state identifier of the control resource set; or,

the user equipment takes one reference signal of the N candidate reference signals, the signal quality of which exceeds a first threshold value, as a transmission state identifier of the control resource set; or,

and under the condition that the signal quality of the N candidate reference signals is lower than a second threshold value, the user equipment selects any one candidate reference signal as the transmission state identifier of the control resource set.

5. The method according to any one of claims 1-4, further comprising:

the user equipment receives second indication information sent by the network equipment, wherein the second indication information indicates that the transmission state identifier of the control resource set corresponds to K candidate reference signals, K is an integer greater than or equal to 1, and the K candidate reference signals are partially the same as or completely different from the N candidate reference signals.

6. The method of claim 1, further comprising:

under the condition that the signal quality of the N candidate reference signals is lower than a third threshold value, the user equipment sends third indication information to the network equipment; the third indication information indicates that the signal quality of the N candidate reference signals is below a threshold.

7. The method of claim 1, further comprising:

under the condition that the user equipment simultaneously receives fourth indication information sent by the network equipment in a multicast mode and fifth indication information sent by the network equipment in a unicast mode, the user equipment takes a reference signal indicated by the fifth indication information as a transmission state identifier of the control resource set; the fourth indication information indicates that the transmission status identifier of the control resource set corresponds to two or more reference signals; the fifth indication information indicates that the transmission status identifier of the control resource set corresponds to a reference signal.

8. A method for transmitting information, the method comprising:

the network equipment sends first indication information to user equipment, wherein the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals; any one of the N candidate reference signals may be used for the ue to receive first downlink control information, where N is an integer greater than or equal to 1;

and the network equipment sends the first downlink control information to the user equipment.

9. The method of claim 8, wherein the first indication information is transmitted by unicast or multicast.

10. The method according to claim 8 or 9, characterized in that the method further comprises:

the network equipment sends second indication information to the user equipment, wherein the second indication information indicates that the transmission state identifier of the control resource set corresponds to K candidate reference signals; k is an integer greater than or equal to 1; the K candidate reference signals are partially the same as or completely different from the N candidate reference signals.

11. The method of claim 8, further comprising:

the network device receives third indication information sent by the user equipment, wherein the third indication information indicates that the signal quality of the N candidate reference signals is lower than a threshold value.

12. A user equipment, wherein the apparatus comprises:

a receiving unit, configured to receive first indication information sent by a network device, where the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals, and N is an integer greater than or equal to 1;

a determining unit, configured to use any one of the N candidate reference signals as a transmission status indicator of the control resource set;

13. A network device, wherein the apparatus comprises:

a generating unit configured to generate first indication information;

a sending unit, configured to send the first indication information to a user equipment, where the first indication information indicates that a transmission state identifier of a control resource set corresponds to N candidate reference signals, and any signal of the N candidate reference signals may be used for the user equipment to receive first downlink control information, where N is an integer greater than or equal to 1;

14. A user device, comprising: a processor and a transceiver;

the transceiver is used for receiving signals or sending signals; the processor to execute computer-executable instructions stored by the memory to cause the user equipment to perform the method of any one of claims 1-7.

15. A network device, comprising: a processor and a transceiver;

the transceiver is used for receiving signals or sending signals; the processor to execute computer-executable instructions stored by the memory to cause the network device to perform the method of any of claims 8-11.

16. A computer-readable storage medium, having stored thereon a computer program which, when run on one or more processors, causes the method of any one of claims 1-7 or the method of any one of claims 8-11 to be performed.