Communication method and related device and equipment

Abstract

The embodiment of the present application discloses a communication method and related devices and equipment, the method comprising: a terminal device receives first indication information, the first indication information is used to indicate a first frequency domain resource, the first frequency domain resource is a subset of the frequency domain resource corresponding to the first partial bandwidth BWP, and the first BWP is a BWP dedicated to the terminal device; the terminal device receives a first PDCCH on the first BWP, the first PDCCH is scrambled by G‑RNTI, and the first PDCCH schedules a first PDSCH within the range of the first frequency domain resource; the terminal device receives a second indication information including a first frequency domain width; the terminal device receives the first PDSCH on the first frequency domain resource. By adopting the embodiment of the present application, broadcast / multicast / groupcast communication can be implemented for 5G NR, and broadcast / multicast / groupcast data transmission can be implemented on a unified frequency domain resource.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and related devices and equipment. Background Art

[0002] At present, the typical bandwidth (i.e., system bandwidth) supported by the fifth-generation (5G) mobile communication new radio (NR) is 100MHz (megahertz), and the user equipment (UE) does not need to support the same bandwidth as the network equipment (such as the base station gNB under the 5G standard). The UE only sends and receives information within the working bandwidth. Usually, the network equipment configures a bandwidth part (BWP) for the UE to send and receive information, and the configured BWP is the working bandwidth of the UE. In the downlink transmission of 5G NR, a UE can be configured with up to 4 downlink part bandwidths (downlink BWP, DL BWP) on a component carrier (CC). However, at the same time, a UE can only have one BWP in an activated state, called an active BWP, and the UE can only send and receive information in the active BWP.

[0003] For downlink transmission of broadcast / multicast / groupcast, the network device usually sends a physical downlink control channel (PDCCH) to a group of UEs. This PDCCH is used to schedule a downlink shared physical channel (PDSCH). This group of UEs will receive the PDSCH scheduled by the PDCCH on the same time-frequency resources. However, since each UE in a group of UEs receiving the same broadcast / multicast / groupcast downlink transmission has its own activated BWP, the resources of each UE's activated BWP in the frequency domain are independently configured. Therefore, if the activated BWP of each UE cannot be aligned in the frequency domain, the network device cannot send broadcast / multicast / groupcast data to a group of UEs on a unified frequency domain resource, that is, when the network device sends PDCCH to a group of UEs on a frequency domain resource, some UEs in this group of UEs may not be able to receive the PDCCH, because each UE can only send and receive information in its own activated BWP, which makes it impossible to achieve broadcast / multicast / groupcast communication on a unified frequency domain resource. Summary of the invention

[0004] The embodiments of the present application provide a communication method and related apparatus and equipment, which can implement broadcast / multicast / groupcast communication for 5G NR and can implement broadcast / multicast / groupcast data transmission on a unified frequency domain resource.

[0005] The present application is introduced below from different aspects. It should be understood that the implementation methods and beneficial effects of the following different aspects can be referenced to each other.

[0006] In the first aspect, an embodiment of the present application provides a communication method, which is applicable to a terminal device (such as UE) for broadcast / multicast / groupcast communication of 5G NR, and the method includes: the terminal device receives first indication information from a network device, and can receive a first PDCCH on a first BWP, and can also receive a second indication information, and receives a first PDSCH scheduled by the first PDCCH within a first frequency domain resource indicated by the first indication information. Optionally, the terminal device can parse the received first PDSCH to obtain user data information carried on the first PDSCH, and the parsing range of the first PDSCH is the first frequency domain resource. Among them, the first indication information can be used to indicate the first frequency domain resource, and the first frequency domain resource can be a subset or a true subset of the frequency domain resource corresponding to the first BWP. The first BWP is a terminal device dedicated BWP (UE dedicatedBWP), and the first BWP is an activated BWP of the terminal device, that is, the terminal device sends and receives information within the first BWP. The first PDCCH carries DCI and can be scrambled by G-RNTI. The first PDCCH can also schedule the first PDSCH within the range of the first frequency domain resources, that is, the indication range of the frequency domain resource allocation information field of the first PDCCH is the first frequency domain resources. Optionally, the first frequency domain resources can be frequency domain resources corresponding to a sub-BWP, and the sub-BWP can be a subset or a true subset of the first BWP. Optionally, the role of the PDCCH can be determined by the RNTI that scrambles the PDCCH, and the first PDCCH scrambled by G-RNTI is a PDCCH used for broadcast / multicast / groupcast transmission.

[0007] As an optional embodiment, the second indication information may also indicate the first frequency domain width, or certain parameters of the frequency domain in an implicit or other manner. The second indication information is associated with the second resource, and the terminal device can determine the second frequency domain resource based on the mapping relationship between the second indication information and the second resource.

[0008] Optionally, the second indication information includes a first frequency domain width, and the first frequency domain width is used to determine the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are independently configured by the network device, that is, the configuration of the first frequency domain resource does not depend on the configuration of the second frequency domain resource, and the terminal device can directly confirm the second frequency domain resource according to the configuration of the second frequency domain resource without relying on the parameters notified during the configuration of the first frequency domain resource. It can be understood that the starting frequency domain position of the first frequency domain resource is different from the starting frequency domain position of the second frequency domain resource, and / or the frequency domain width of the first frequency domain resource is different from the frequency domain width of the second frequency domain resource. The starting frequency domain position of the first frequency domain resource can be the RB (lowest RB) with the smallest index number (i.e., sequence number) in any subset or true subset of the frequency domain resources corresponding to the above-mentioned first BWP. The starting frequency domain position of the second frequency domain resource is the RB with the smallest index number (i.e., sequence number) in the control resource set (CORESET) or predefined BWP for receiving the above-mentioned first PDCCH (the first PDCCH here refers to the PDCCH encrypted by G-RNTI). The frequency domain width of the first frequency domain resource is flexibly configurable, that is, the frequency domain width of the first frequency domain resource can be any number of RBs in a subset or true subset of the frequency domain resources corresponding to the above-mentioned first BWP. The frequency domain width of the second frequency domain resource (i.e., the first frequency domain width) can be the number of continuous RBs corresponding to CORESET0, where CORESET0 can be indicated by a system message or configured by high-level signaling, and the number of RBs of CORESET0 can be configured to 24, 48, or 96.

[0009] The terminal device of the embodiment of the present application receives the first frequency domain resource indicated by the network device through the indication information, receives and parses the first PDSCH scheduled by the first PDCCH on this first frequency domain resource, and obtains the user data information carried on the first PDSCH. Because the first PDCCH is scrambled by the G-RNTI, it means that the first PDCCH is a PDCCH for broadcast / multicast / multicast transmission, and it also means that the data carried on the first PDSCH scheduled by the first PDCCH is broadcast / multicast / multicast transmission data. Therefore, the communication method provided in the embodiment of the present application can realize broadcast / multicast / multicast communication for 5G NR, and can realize broadcast / multicast / multicast data transmission on a unified frequency domain resource (first frequency domain resource).

[0010] In combination with the first aspect, in a possible implementation, the terminal device receives the first PDCCH on the above-mentioned first BWP, including: the terminal device can receive the first PDCCH within the above-mentioned first frequency domain resources. Optionally, the terminal device can parse the received first PDCCH to obtain the DCI carried on the first PDCCH. The parsing process here may include demodulation, decoding and other processing. The format of the DCI carried on the first PDCCH can be a non-fallback DCI, such as DCIformat 1_1. The range indicated by the frequency domain resource allocation information field of the first PDCCH does not exceed the first frequency domain resources.

[0011] The terminal device in the embodiment of the present application directly receives and parses the first PDCCH on the first frequency domain resources, which reduces the frequency domain range for receiving downlink broadcast / multicast / groupcast transmissions, improves processing efficiency, and reduces processing delays.

[0012] In combination with the first aspect, in a possible implementation, after the terminal device receives the first PDCCH on the above-mentioned first BWP, the method further includes: the terminal device may parse the first PDCCH within the frequency domain resources corresponding to the first BWP to obtain the DCI carried on the first PDCCH. The parsing process here may include demodulation, decoding and other processing. The format of the DCI carried on the first PDCCH may be a non-fallback DCI, such as DCI format 1_1. The range indicated by the frequency domain resource allocation information field of the first PDCCH does not exceed the frequency domain resources corresponding to the first BWP.

[0013] The terminal device of the embodiment of the present application parses the first PDCCH on the frequency domain resources corresponding to the first BWP, and can obtain a more complete DCI. It also means that the frequency domain resources of the first PDCCH can be the frequency domain resources corresponding to the first BWP, which can increase the flexibility of the frequency domain resources of the first PDCCH.

[0014] In combination with the first aspect, in a possible implementation, before the terminal device receives the first PDCCH on the above-mentioned first BWP, the method also includes: the terminal device receives third indication information from the network device, and the third indication information can be used to indicate the format of the DCI carried by the above-mentioned first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI. The non-fallback DCI here may refer to DCI format 1_1, or DCI in other formats except fallback DCI (DCI format 1_0). The non-fallback DCI may include control information not included in the fallback DCI, such as one or more of a carrier indication, a BWP indication, a physical resource block bundling size indicator, a rate matching indicator, a zero power channel state information reference signal trigger, a sounding reference signal request, an antenna port, and a transmission configuration indicator.

[0015] The embodiment of the present application can use non-fallback DCI to schedule PDSCH. Because the control information that can be carried by non-fallback DCI is richer than that of fallback DCI, it can support multi-antenna / multi-user transmission (this is because the non-fallback DCI includes antenna ports and transmission configuration indicators), which can improve the flexibility of broadcast / multicast / groupcast transmission under 5GNR.

[0016] In combination with the first aspect, in a possible implementation, before the terminal device receives the first PDCCH on the first BWP, the method further includes: the terminal device receives fourth indication information from the network device, and the fourth indication information can be used to indicate the first control resource set. The frequency domain resources corresponding to the first control resource set can be a subset or a true subset of the first frequency domain resources.

[0017] The embodiment of the present application limits the frequency domain resources corresponding to the first control resource set to the first frequency domain resources, so that when the terminal device parses the first PDCCH in the first frequency domain resources, it can also parse and obtain a complete DCI.

[0018] In combination with the first aspect, in a possible implementation, before the terminal device receives the first PDCCH on the above-mentioned first BWP, the method also includes: the terminal device receives fifth indication information from the network device, and the fifth indication information can be used to indicate the first common search space associated with the above-mentioned first control resource set. Among them, the first common search space can be used to detect the above-mentioned first PDCCH. The first common search space can be common to all terminal devices or a group of terminal devices in the cell, that is, all terminal devices or a group of terminal devices can detect the first PDCCH encrypted by G-RNTI and other RNTI encrypted PDCCHs in the first common search space; the first common search space can also be a search space configured for the first PDCCH encrypted by G-RNTI, that is, all terminal devices or a group of terminal devices can only detect the first PDCCH encrypted by G-RNTI in the first common search space.

[0019] Because the possible location of the PDCCH can be determined by the control resource set and the common search space, the terminal device of the embodiment of the present application receives the first control resource set and the first search space indicated by the network device, which can determine the possible location of the first PDCCH and assist the terminal device in receiving the first PDCCH.

[0020] In combination with the first aspect, in a possible implementation, the first indication information may include at least one of the starting frequency domain position, frequency domain width or parameter set (numerology) of the first frequency domain resource. The parameter set may include subcarrier spacing and cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP, that is, the subcarrier spacing of the first frequency domain resource is the same as the subcarrier spacing of the first BWP, and the cyclic prefix of the first frequency domain resource is the same as the cyclic prefix of the first BWP.

[0021] In the second aspect, an embodiment of the present application provides another communication method, which is applicable to a network device (such as gNB) for broadcast / multicast / multicast communication of 5G NR, and the method includes: the network device can determine a first frequency domain resource, and can send a first indication information to a group of terminal devices, and then can send a first PDCCH to this group of terminal devices, and can also send a second indication information including a first frequency domain width, and send a first PDSCH on the first frequency domain resource. Among them, this group of terminal devices can be a group of terminal devices that receive broadcast / multicast / multicast transmissions in a cell. The first indication information can be used to indicate the first frequency domain resource, and the first frequency domain resource can be a subset or a true subset of the frequency domain resource corresponding to the first BWP. The first BWP is a terminal device dedicated BWP (UE dedicated BWP), and the first BWP is an activated BWP for the terminal device, that is, the terminal device sends and receives information within the first BWP. The first PDCCH carries DCI and can be scrambled by G-RNTI. The first PDCCH can also schedule the first PDSCH within the range of the first frequency domain resources, that is, the indication range of the frequency domain resource allocation information field of the first PDCCH is the first frequency domain resources. The first PDSCH carries user data information. Optionally, the first frequency domain resources can be frequency domain resources corresponding to a sub-BWP, and the sub-BWP can be a subset or a true subset of the first BWP. Optionally, the role of the PDCCH can be determined by the RNTI that scrambles the PDCCH, and the first PDCCH scrambled by G-RNTI is a PDCCH used for broadcast / multicast / groupcast transmission.

[0022] As an optional embodiment, the second indication information may also indicate the first frequency domain width, or certain parameters of the frequency domain in an implicit or other manner. The second indication information is associated with the second resource, and the terminal device can determine the second frequency domain resource based on the mapping relationship between the second indication information and the second resource.

[0023] Optionally, the second indication information includes a first frequency domain width, and the first frequency domain width is used to determine the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are independently configured by the network device, that is, the configuration of the first frequency domain resource does not depend on the configuration of the second frequency domain resource, and the terminal device can directly confirm the second frequency domain resource according to the configuration of the second frequency domain resource without relying on the parameters notified during the configuration of the first frequency domain resource. It can be understood that the starting frequency domain position of the first frequency domain resource is different from the starting frequency domain position of the second frequency domain resource, and / or the frequency domain width of the first frequency domain resource is different from the frequency domain width of the second frequency domain resource. The starting frequency domain position of the first frequency domain resource can be the RB (lowest RB) with the smallest index number (i.e., sequence number) in any subset or true subset of the frequency domain resources corresponding to the above-mentioned first BWP. The starting frequency domain position of the second frequency domain resource is the RB with the smallest index number (i.e., sequence number) in the control resource set (i.e., CORESET) or predefined BWP for receiving the above-mentioned first PDCCH (the first PDCCH here refers to the PDCCH encrypted by G-RNTI). The frequency domain width of the first frequency domain resource is flexibly configurable, that is, the frequency domain width of the first frequency domain resource can be any number of RBs in a subset or true subset of the frequency domain resources corresponding to the above-mentioned first BWP. The frequency domain width of the second frequency domain resource (i.e., the first frequency domain width) can be the number of consecutive RBs corresponding to CORESET0, where CORESET0 can be indicated by a system message or configured by high-level signaling, and the number of RBs of CORESET0 is 24, 48, or 96.

[0024] The network device of the embodiment of the present application configures the first frequency domain resource for broadcast / multicast / multicast transmission in the frequency domain resource corresponding to the terminal device dedicated BWP (UE dedicated BWP). When the terminal device needs to receive unicast transmission, the UE dedicated BWP will be activated. At the same time, the terminal device can also receive multicast transmission in the activated BWP (this is because part of the frequency domain resources of the activated BWP are configured for broadcast / multicast / multicast transmission), that is, unicast and multicast transmission can be completed within one BWP. Therefore, there is no need to additionally configure the working bandwidth for broadcast / multicast / multicast transmission. When the terminal device needs to frequently receive unicast transmission and multicast transmission, it does not need to switch back and forth between the unicast working bandwidth and the multicast working bandwidth, thereby saving switching delay.

[0025] In conjunction with the second aspect, in a possible implementation, when the network device sends the first PDCCH, the first PDCCH may be sent within the first frequency domain resource. The range indicated by the frequency domain resource allocation information field of the first PDCCH does not exceed the first frequency domain resource.

[0026] In combination with the second aspect, in a possible implementation, before the network device sends the first PDCCH, the method also includes: the network device may send a third indication information to all terminal devices in the cell, and the third indication information may be used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is a non-fallback DCI. The non-fallback DCI here may refer to DCI format 1_1, or DCI in other formats except fallback DCI (DCI format 1_0). The non-fallback DCI may include control information not included in the fallback DCI, such as one or more of a carrier indication, a BWP indication, a physical resource block bundling size indicator, a rate matching indicator, a zero power channel state information reference signal trigger, a sounding reference signal request, an antenna port, and a transmission configuration indicator.

[0027] In combination with the second aspect, in a possible implementation, before the network device sends the first PDCCH, the method further includes: the network device may send fourth indication information, and the fourth indication information may be used to indicate the first control resource set. The frequency domain resources corresponding to the first control resource set may be a subset or a true subset of the first frequency domain resources.

[0028] In combination with the second aspect, in a possible implementation, before the network device sends the first PDCCH, the method also includes: the network device may send fifth indication information, and the fifth indication information may be used to indicate the first common search space associated with the above-mentioned first control resource set. Among them, the first common search space may be used to detect the above-mentioned first PDCCH. The first common search space may be common to all terminal devices or a group of terminal devices in the cell, that is, all terminal devices or a group of terminal devices can detect the first PDCCH encrypted with G-RNTI and other RNTI encrypted PDCCHs in the first common search space; the first common search space may also be a search space configured for the first PDCCH encrypted with G-RNTI, that is, all terminal devices or a group of terminal devices can only detect the first PDCCH encrypted with G-RNTI in the first common search space.

[0029] In combination with the second aspect, in a possible implementation, the first indication information may include at least one of the starting frequency domain position, frequency domain width or parameter set (numerology) of the first frequency domain resource. The parameter set may include subcarrier spacing and cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP, that is, the subcarrier spacing of the first frequency domain resource is the same as the subcarrier spacing of the first BWP, and the cyclic prefix of the first frequency domain resource is the same as the cyclic prefix of the first BWP.

[0030] In the third aspect, an embodiment of the present application provides a terminal device, which includes a unit and / or module for executing the communication method provided by the above-mentioned first aspect and / or any possible implementation method of the first aspect, thereby also being able to achieve the beneficial effects (or advantages) of the communication method provided by the first aspect.

[0031] In a fourth aspect, an embodiment of the present application provides a network device, which includes a unit and / or module for executing the communication method provided by the above-mentioned second aspect and / or any possible implementation method of the second aspect, thereby also being able to achieve the beneficial effects (or advantages) of the communication method provided by the second aspect.

[0032] In a fifth aspect, an embodiment of the present application provides a terminal device, comprising a processor, a transceiver and a memory, wherein the memory is used to store a computer program, the transceiver is used to send and receive various information, the computer program includes program instructions, and when the processor runs the program instructions, the communication method of the above-mentioned first aspect is executed.

[0033] In a sixth aspect, an embodiment of the present application provides a network device, comprising a processor, a transceiver and a memory, wherein the memory is used to store a computer program, the transceiver is used to send and receive various information, the computer program comprises program instructions, and when the processor runs the program instructions, the communication method of the second aspect mentioned above is executed.

[0034] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed on the computer, the computer executes the communication method in the first aspect above.

[0035] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed on the computer, the computer executes the communication method in the above-mentioned second aspect.

[0036] In a ninth aspect, an embodiment of the present application provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer executes the communication method of the first aspect.

[0037] In a tenth aspect, an embodiment of the present application provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer executes the communication method of the second aspect.

[0038] In an eleventh aspect, an embodiment of the present application provides a communication device having the functions of a terminal device in any possible implementation of the first aspect. These functions can be implemented by hardware, or corresponding software can be implemented by hardware. The hardware or software includes one or more units (or modules) corresponding to these functions.

[0039] In a twelfth aspect, an embodiment of the present application provides a communication device, which has the functions of a network device in any possible implementation of the second aspect. These functions can be implemented by hardware, or corresponding software can be implemented by hardware. The hardware or software includes one or more units (or modules) corresponding to these functions.

[0040] In a thirteenth aspect, an embodiment of the present application provides a chip, comprising a processor. The processor is used to read and execute a computer program stored in a memory to execute the communication method in any possible implementation of the first aspect or the second aspect. Optionally, the chip also includes a memory, which is connected to the processor via a circuit or wire. Further optionally, the chip also includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive data and / or information to be processed, the processor obtains the data and / or information from the communication interface, processes the data and / or information, and outputs the processing results through the communication interface. The communication interface can be an input and output interface.

[0041] Optionally, the processor and memory mentioned above may be physically independent units, or the memory may be integrated with the processor.

[0042] In the fourteenth aspect, an embodiment of the present application provides a communication system, which includes a terminal device and a network device, wherein: the terminal device is a terminal device in the communication method described in the above-mentioned first aspect or any possible implementation of the above-mentioned first aspect, and the network device is a network device in the communication method described in the above-mentioned second aspect or any possible implementation of the above-mentioned second aspect.

[0043] By implementing the embodiments of the present application, broadcast / multicast / groupcast communication can be implemented for 5G NR, and broadcast / multicast / groupcast data transmission can be implemented on a unified frequency domain resource. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of the architecture of a mobile communication system provided in an embodiment of the present application;

[0045] Figure 2 is a schematic flow chart of a communication method provided in an embodiment of the present application;

[0046] Figure 3 It is a schematic diagram of the relationship between the sub-BWP and the first BWP, the second BWP and the third BWP provided in the embodiment of the present application;

[0047] Figure 4 is a schematic diagram of the parsing range of the first PDCCH provided in an embodiment of the present application;

[0048] Figure 5 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0049] Figure 6 It is a schematic diagram of the structure of a network device provided in an embodiment of the present application;

[0050] Figure 7 It is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0052] To facilitate a better understanding of the communication method provided in the embodiment of the present application, some terms (nouns) involved in the communication method provided in the embodiment of the present application are briefly described below:

[0053] 1. UE dedicated BWP

[0054] A UE can be configured with up to 4 DL BWPs on a unit carrier through high-level parameters, such as high-level parameters BWP-Downlink or initialDownlinkBWP. The types of DL BWP can be divided into three categories, namely initial BWP, dedicated BWP and default BWP. Among them, the initial BWP is the BWP configured in the initial access phase of the UE, which can be used to transmit the remaining minimum system information (RMSI), contention-based random access message 2 (message2, MSG2) and message 4 (message4, MSG4) PDSCH. The dedicated BWP is the BWP configured by the UE in the radio resource control (RRC) connected state, which can be used to transmit data services, such as ultra-high-definition video, augmented reality (AR), virtual reality (VR) and other data services. In a cell, the initial BWP of all UEs is the same, and the dedicated BWPs of different UEs are independently configured, that is, the dedicated BWPs of different UEs can be different.

[0055] 2. Activate BWP

[0056] For a UE, only one BWP can be activated at any time. This BWP in the activated state is called the activated BWP. The UE can only send and receive information in the activated BWP. The selection and switching of the activated BWP can be achieved in the following ways: (1) Dynamic indication through downlink control information (DCI) carried by PDCCH. For example, DCI format 1_1 is used to activate DL BWP. The bandwidth part of the DCI indicates that the information field (or BWP indicator) is used to indicate the activated DL BWP for downlink reception. (2) The activation and deactivation of BWP is controlled by the BWP inactivity timer (bwp-Inactivity Timer) (when the BWP inactivity timer times out, it indicates that the current BWP is deactivated). (3) Semi-static configuration through RRC signaling. (4) The random access process is triggered by the media access control (MAC) entity itself.

[0057] 3. Physical downlink control channel (PDCCH)

[0058] PDCCH carries scheduling and other control information, including transmission format, resource preemption, uplink / downlink scheduling permission, power control, and uplink retransmission information. PDCCH is a set of physical resource elements that carries downlink control information (DCI), including resource allocation and other control information on one or more UEs.

[0059] 4. Downlink control information (DCI)

[0060] DCI is carried by PDCCH and is the downlink control information sent by the network equipment to the UE, including uplink and downlink resource allocation, hybrid automatic repeat request (HARQ) information, power control, etc. Downlink scheduling permission DCI can include two formats: DCI format 1_0 and DCI format 1_1. Among them, DCI format 1_0 is a fallback DCI, which is used for downlink control information transmitted during RRC initialization access state or cell switching. DCIformat 1_0 can also be used to schedule PDSCH carrying paging information, initial access response information, and system messages. DCIformat 1_1 is a non-fallback DCI, which is used to schedule PDSCH in the RRC connected state. The sequence of the cyclic redundancy check (CRC) used to scramble the DCI can be a radio network temporary identifier (RNTI). For example, the RNTI of the scrambled DCI format 1_0 may include paging-radio network temporary identifier (paging-RNTI, P-RNTI), random access-radio network temporary identifier (random access-RNTI, RA-RNTI), system information-radio network temporary identifier (system information-RNTI, SI-RNTI), cell radio network temporary identifier (cell-RNTI, C-RNTI), temporary cell radio network temporary identifier (temporary cell-RNTI, TC-RNTI), configured scheduling-radio network temporary identifier (configured scheduling-RNTI, CS-RNTI) or modulation and coding scheme-cell radio network temporary identifier (modulation and coding scheme-cell-RNTI, MCS-C-RNTI).

[0061] 5. Search space

[0062] The search space refers to the set of candidate PDCCHs (PDCCH candidates) at a certain aggregation level. The aggregation level is the number of control channel elements (CCE) that constitute the PDCCH. CCE is the basic unit that constitutes the PDCCH. One CCE occupies 6 resource element groups (REGs) in the frequency domain. The types of search spaces can include public search spaces and UE-specific search spaces. For UE-specific search spaces, only one UE can detect PDCCH in the search space; for public search spaces, multiple UEs can detect PDCCH in this search space.

[0063] 6. Control resource set (CORESET)

[0064] The 5G NR system encapsulates information such as the frequency band occupied by the PDCCH in the frequency domain and the number of orthogonal frequency division multiplexing (OFDM) symbols occupied in the time domain in the control resource set; and encapsulates information such as the starting OFDM symbol number of the PDCCH and the monitoring period of the PDCCH in the search space. The possible location of the PDCCH can be determined through the control resource set and the search space.

[0065] 7. Physical downlink shared channel (PDSCH)

[0066] PDSCH may be used to carry data from transport channels.

[0067] 8. Resource Block (RB)

[0068] In the time domain, the smallest resource granularity is 1 OFDM symbol; in the frequency domain, the smallest resource granularity is 1 subcarrier. 1 OFDM symbol in the time domain and 1 subcarrier in the frequency domain are called 1 time-frequency resource element (RE). The physical layer uses RE as the basic unit when performing resource mapping. All OFDM symbols in 1 time slot and 12 consecutive subcarriers in the frequency domain form a resource block RB, that is, 1 RB = 12 subcarriers. The bandwidth of 1 RB is 12*subcarrier spacing. Every 4 consecutive REs are called a resource element group (REG). Every 9 REGs are 1 CCE.

[0069] The above content briefly explains some of the terms (nouns) involved in the communication method provided in the embodiment of the present application. The system architecture of the communication method provided in the embodiment of the present application will be described below.

[0070] The communication method provided in the embodiment of the present application can be applied to the NR system in the fifth generation mobile communication system and / or future mobile communication systems. For ease of understanding, the embodiment of the present application first briefly introduces the system architecture of the mobile communication system.

[0071] See also Figure 1 , Figure 1 Schematic diagram of the architecture of the mobile communication system provided by the embodiment of the present application. Figure 1 As shown, the mobile communication system may include a network device 110 and at least two terminal devices (such as Figure 1 The terminal devices 120, 130 and 140 in the network are shown in FIG. 1 . The terminal devices can be connected to the network devices wirelessly. The terminal devices can be fixed or movable. Figure 1 This is just a schematic diagram. The mobile communication system may also include other network devices, such as wireless relay devices and / or wireless backhaul devices. Figure 1 The embodiment of the present application does not limit the number of network devices and terminal devices included in the mobile communication system.

[0072] Among them, the network device can be an entity on the network side for transmitting or receiving signals, such as gNB. The network device can also be an access device for the terminal device to access the mobile communication system by wireless means, such as the network device can be a base station NodeB, an evolved base station (evolved NodeB, eNB), a transmission reception point (transmission reception point, TRP), a next generation base station (next generation NodeB, gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0073] The terminal device can be an entity on the user side for receiving or transmitting signals, such as a mobile phone UE. The terminal device can also be called a terminal Terminal, UE, mobile station (MS), mobile terminal (MT), etc. The terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0074] In some feasible implementations, the network equipment and terminal equipment in the mobile communication system can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; can also be deployed on aircraft, drones, balloons and satellites in the air. The embodiments of this application do not limit the application scenarios of the network equipment and terminal equipment.

[0075] In some possible implementations, Figure 1 The network device 110 shown can send a broadcast / multicast / groupcast PDCCH to the terminal device 120, the terminal device 130 and the terminal device 140. However, since the terminal device 120, the terminal device 130 and the terminal device 140 have their own activated BWPs, and the activated BWPs of each terminal device are independently configured, the terminal devices 120, 130 and 140 may not all receive the broadcast / multicast / groupcast PDCCH. If a terminal device cannot receive the broadcast / multicast / groupcast PDCCH, it cannot receive the PDSCH scheduled by the PDCCH, and also cannot receive the broadcast / multicast / groupcast data carried on the PDSCH, that is, it cannot achieve broadcast / multicast / groupcast transmission and communication.

[0076] Therefore, an embodiment of the present application provides a communication method that can implement broadcast / multicast / groupcast communication of 5G NR, and can implement broadcast / multicast / groupcast downlink data transmission on a unified frequency domain resource.

[0077] The following will be combined with the attached Figure 2 To Attachment Figure 4, the communication method provided in the embodiment of the present application is described in detail.

[0078] It is understandable that in practical applications, the number of terminal devices in the communication method provided in the embodiment of the present application can be greater than or equal to 2, and the number of network devices can be greater than or equal to 1. For ease of understanding, the communication method provided in the embodiment of the present application is described below using only three terminal devices and one network device as an example. The three terminal devices can be the first terminal device, the second terminal device, and the third terminal device. Optionally, the first terminal device can be Figure 1 The terminal device 120 shown in the figure, the second terminal device can be Figure 1 The terminal device 130 shown, the third terminal device can be Figure 1 The terminal device 140 is shown.

[0079] It is understandable that for a network device on the network side, if the network device wants to implement broadcast / multicast / multicast downlink transmission with a group of terminal devices, the network device needs to know the information of this group of terminal devices. It can be explained that on the network side, the network device can obtain the information of each terminal device in this group of terminal devices, and can also configure information for this group of terminal devices. Therefore, for the network side, the communication method provided in the embodiment of the present application is the communication (interaction) between a single network device and multiple terminal devices.

[0080] It is also understandable that, for the terminal devices on the user side, during the downlink transmission of broadcast / multicast / groupcast, each terminal device can receive information sent by the network device, and each terminal device can only know its own behavior (such as what information it has received), and cannot know the behavior of other terminal devices in a group of terminal devices. Therefore, for the user side, the communication method provided in the embodiment of the present application is the communication (interaction) between a single terminal device and a single network device.

[0081] See also Figure 2 , Figure 2 is a schematic flow chart of the communication method provided in the embodiment of the present application. Figure 2 As shown, the communication method provided in the embodiment of the present application includes but is not limited to the following steps:

[0082] S201, a network device sends first indication information. Correspondingly, a first terminal device, a second terminal device, and a third terminal device receive the first indication information respectively.

[0083] In some feasible implementations, the first indication information may be a high-level signaling, for example, the first indication information may be an RRC signaling or a media access control layer control element (MAC CE). The first indication information may be used to indicate a first frequency domain resource, which may be a frequency domain resource configured by a high-level signaling.

[0084] In some feasible implementations, the above-mentioned first frequency domain resources may be a subset of the frequency domain resources corresponding to the first BWP, and further, the first frequency domain resources may be a true subset of the frequency domain resources corresponding to the first BWP. The first BWP may be an activated BWP of a terminal device in a group of terminal devices, that is, the terminal device is configured to receive and / or send information in the first BWP, and the first BWP may be a dedicated BWP for the terminal device (UE dedicated BWP). In another embodiment, the first BWP may be an activated BWP for a specific terminal, and the specific terminal may be configured or preset. The first BWP may also be a BWP or multiple BWPs configured by the system. Specifically, the first indication information may include at least one of the frequency domain width, starting frequency domain position or parameter set (numerology) of the first frequency domain resource.

[0085] In some feasible implementations, the starting frequency domain position of the above-mentioned first frequency domain resource can be expressed as the frequency offset between the minimum RB included in the first frequency domain resource (in one embodiment, if the index value is sorted from low to high or from small to large according to frequency, it can refer to the RB with the smallest index value in the first frequency domain resource) and point A, where point A is the common reference point of the resource block grid. The bandwidth (i.e., frequency domain width) of the first frequency domain resource can be expressed as the number of RBs, or the number of resource block groups (RBGs), or the number of REGs included in the first frequency domain resource. The parameter set of the first frequency domain resource can be consistent with the parameter set of the first BWP, and the parameter set can include a subcarrier spacing (SCS) and a cyclic prefix (CP), that is, the SCS of the first frequency domain resource is the same as the SCS of the first BWP, and the CP of the first frequency domain resource is the same as the CP of the first BWP. Optionally, the first frequency domain resource may be a continuous and uninterrupted frequency domain resource, where "continuous and uninterrupted" may refer to physical continuity and uninterrupted; or may refer to logical continuity, indicating that the index of the RB included in the first frequency domain resource may be continuous.

[0086] In some feasible implementations, the first frequency domain resource indication field (here, the frequency domain position and bandwidth of the first frequency domain resource) may be composed of a resource indication value (RIV). The resource indication value may be expressed as:

[0087] if but

[0088]

[0089] otherwise,

[0090]

[0091] in, RB start represents the starting RB index of the first frequency domain resource, L RBs represents the number of RBs continuously allocated to the first frequency domain resource, Indicates the number of physical resource blocks (ie, the number of RBs) occupied by the first BWP.

[0092] In some feasible implementations, the network device determines a group of terminal devices that receive broadcast / multicast / multicast transmission. This group of terminal devices can be all terminal devices in the cell where the network device is located, or it can be part of the terminal devices in the cell where the network device is located. In some extreme cases, a group of terminal devices can also include only a single terminal device. The network device can configure an activation BWP for each terminal device in this group of terminal devices. For example, the group of terminal devices can include a first terminal device, a second terminal device, and a third terminal device. Since the activation BWP of the terminal device is configured by the network device, the network device can determine the activation BWP of the first terminal device, the second terminal device, and the third terminal device. For ease of description, the above-mentioned first BWP is used as the activation BWP of the first terminal device, the activation BWP of the second terminal device is referred to as the second BWP, and the activation BWP of the third terminal device is referred to as the third BWP. The network device can configure a first frequency domain resource for the group of terminal devices (including the first terminal device, the second terminal device, and the third terminal device), and the first frequency domain resource is used to receive broadcast / multicast / multicast transmission. After the network device determines the first frequency domain resource, it can send a first indication information to the group of terminal devices to indicate the first frequency domain resource. Accordingly, at least one terminal device among the first terminal device, the second terminal device, and the third terminal device in the group of terminal devices receives the first indication information. The first frequency domain resource can be a subset or a true subset of the intersection of the frequency domain resources corresponding to the first BWP, the frequency domain resources corresponding to the second BWP, and the frequency domain resources corresponding to the third BWP.

[0093] Optionally, the first frequency domain resource may be a frequency domain resource corresponding to a sub-BWP (sub-BWP or sub-bandwidth), and the sub-BWP may be a subset or a true subset of the intersection of the first BWP, the second BWP and the third BWP. The first indication information may also include information related to the sub-BWP, such as related parameters, for example, the BWP-Common parameter. The BWP-Common parameter in the first indication information may be used to indicate that the sub-BWP is a common BWP or a group common BWP. Among them, a common BWP may be common to the cell, indicating that terminal devices in the entire cell can receive broadcast / multicast / multicast downlink transmissions on the BWP; a group common BWP indicates that the terminal devices in the cell are divided into several groups, among which at least one group of terminal devices can receive broadcast / multicast / multicast downlink transmissions on the BWP. Further optionally, the information (or parameters) included in the first indication information may be indicated by the same or different information elements. For example, one information element indicates the CP, SCS, frequency domain position and bandwidth of the first frequency domain resource, and another information element indicates information (or parameters) related to the sub-BWP, such as BWP-ID, BWP-common or BWP-dedicated.

[0094] For example, Figure 3 As shown, Figure 3 Schematic diagram of the relationship between the sub-BWP and the first BWP, the second BWP and the third BWP provided in the embodiment of the present application. Figure 3 As shown, the first BWP is BWP1, the second BWP is BWP2, and the third BWP is BWP3; the first terminal device is terminal device 120, the second terminal device is terminal device 130, and the third terminal device is terminal device 130. Figure 3 As shown, the sub-BWP is the overlapping portion of the first BWP, the second BWP and the third BWP.

[0095] In some feasible implementations, the first terminal device may receive the above-mentioned first indication information sent by the network device, and the first frequency domain resources indicated by the first indication information may be a subset or a true subset of the frequency domain resources corresponding to the above-mentioned first BWP, and the first BWP may be a dedicated BWP for the first terminal device. Assuming that the first terminal device is UE#1, the first BWP is UE#1 dedicated BWP. Similarly, the second terminal device may receive the above-mentioned first indication information sent by the network device, and the first frequency domain resources indicated by the first indication information may be a subset or a true subset of the frequency domain resources corresponding to the above-mentioned second BWP, and the second BWP may be a dedicated BWP for the second terminal device. Assuming that the second terminal device is UE#2, the second BWP is UE#2dedicated BWP. Again, similarly, the third terminal device may receive the above-mentioned first indication information sent by the network device, and the first frequency domain resources indicated by the first indication information may be a subset or a true subset of the frequency domain resources corresponding to the above-mentioned third BWP, and the third BWP may be a dedicated BWP for the third terminal device. Assuming that the third terminal device is UE#3, the third BWP is UE#3dedicated BWP.

[0096] S202, the network device sends third indication information. Correspondingly, the first terminal device, the second terminal device and the third terminal device receive the third indication information respectively.

[0097] In some feasible implementations, the third indication information may be used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI is non-fallback DCI, where the non-fallback DCI may refer to DCI format 1_1, or DCI in other formats except fallback DCI (DCI format 1_0). Optionally, both fallback DCI (DCI format 1_0) and non-fallback DCI (such as DCI format 1_1) may be used to schedule PDSCH, but the control information carried by the non-fallback DCI may be richer than the fallback DCI. For example, the control information carried by the non-fallback DCI may include one or more of the following information: carrier indication, BWP indication, physical resource block (PRB) bundling size indicator, rate matching indicator, zero-power channel state information-reference signal (CSI-RS) trigger, sounding reference signal (SRS) request, antenna port, transmission configuration indicator, while the control information carried by the fallback DCI does not include any of the above information. The BWP indication may be used to indicate activation of the BWP.

[0098] In some feasible implementations, the third indication information directly indicates whether the format of the DCI carried by the first PDCCH is non-fallback DCI, and the third indication information may be a high-level parameter RRC signaling, such as a non-fallback DCI switch parameter. If the non-fallback DCI switch parameter is set to ON, it indicates that the DCI carried by the first PDCCH is non-fallback DCI. If the non-fallback DCI switch parameter is set to OFF, it indicates that the DCI carried by the first PDCCH is fallback DCI. The DCI format can be directly determined by setting the non-fallback DCI switch parameter to ON or OFF. For example, if the non-fallback DCI switch parameter is set to OFF, DCI format 1_0 is indicated.

[0099] Optionally, the non-fallback DCI switch parameter may be included in the first indication information, and the network device does not need to send a separate indication information (i.e., the third indication information) to indicate the format of the DCI or to indicate that the format of the DCI is non-fallback DCI. It is understandable that if the non-fallback DCI switch parameter is included in the first indication information, step S202 of the embodiment of the present application may not be performed.

[0100] In some feasible implementations, the network device may send a third indication message to all terminal devices in the cell where the network device is located. It is understandable that the third indication message acts on all UEs in the cell, rather than a specific UE (per UE). Accordingly, all terminal devices in the cell where the network device is located may receive the third indication message. Of course, the first terminal device may receive the third indication message sent by the network device. Similarly, the third terminal device may receive the third indication message sent by the network device. Again, the third terminal device may receive the third indication message sent by the network device.

[0101] Since the third indication information is used to indicate the format of the DCI carried by the first PDCCH, or indicates that the format of the DCI is non-fallback DCI, the network device informs the terminal device through the third indication information that the DCI format can be non-fallback DCI, that is, the network device tells the terminal device that it can identify and receive non-fallback DCI, so after the network device sends the PDCCH carrying non-fallback DCI, the terminal device can receive this PDCCH, and can demodulate, decode and other operations on the non-fallback DCI carried by this PDCCH to obtain the control information carried in the non-fallback DCI. Therefore, the embodiment of the present application can use non-fallback DCI to schedule PDSCH, and because the control information that can be carried by non-fallback DCI is richer than that of fallback DCI, it can support multi-antenna / multi-user transmission (this is because the non-fallback DCI includes antenna ports and transmission configuration indicators), which can improve the flexibility of broadcast / multicast / groupcast transmission under 5GNR.

[0102] S203: The network device sends a first PDCCH.

[0103] In some feasible implementations, the first PDCCH carries DCI, and the format of the DCI may be a non-fallback DCI, such as DCI format 1_1. The first PDCCH may be scrambled by a group-radio network temporary identifier (G-RNTI), and the first PDCCH (or DCI format 1_1) may schedule the first PDSCH within the scope of the first frequency domain resources. Optionally, the role of the PDCCH may be determined by the RNTI that scrambles the PDCCH, and the PDCCH scrambled by the G-RNTI is a PDCCH for broadcast / multicast / groupcast transmission. Specifically, the UE can identify the PDCCH through the RNTI. For example, if the PDCCH is scrambled by the G-RNTI, it means that the PDCCH is used to schedule broadcast / multicast / groupcast transmissions; if the PDCCH is scrambled by the paging-radio network temporary identifier (paging-RNTI, P-RNTI), it means that the PDCCH is used to schedule the paging PDSCH; if the PDCCH is scrambled by the random access-radio network temporary identifier (random access-RNTI, RA-RNTI), it means that the PDCCH is used to schedule the random access PDSCH.

[0104] In some feasible implementations, before the network device sends the first PDCCH, it may send fourth indication information, where the fourth indication information indicates the first control resource set. The first control resource set may be a group-control resource set (group-CORESET, G-CORESET). The frequency domain resources corresponding to the first control resource set may be a subset or a true subset of the above-mentioned first frequency domain resources. The fourth indication information may include information related to the first control resource set, such as configuration information of the first control resource set.

[0105] In some feasible implementations, before the network device sends the first PDCCH, it may also send fifth indication information, and the fifth indication information indicates the first common search space associated with the above-mentioned first control resource set. The first common search space can be used to detect the above-mentioned first PDCCH. The first common search space can be common to all terminal devices or a group of terminal devices in the cell where the network device is located, that is, all terminal devices or a group of terminal devices can detect the first PDCCH encrypted with G-RNTI and other RNTI encrypted PDCCHs in the first common search space; the first common search space can also be a search space configured for the first PDCCH encrypted with G-RNTI, that is, all terminal devices or a group of terminal devices can only detect the first PDCCH encrypted with G-RNTI in the first common search space.

[0106] In some other feasible implementations, the fourth indication information and the fifth indication information may be the same indication information, that is, one indication information may be used to indicate the first control resource set and the first common search space associated with the first control resource set.

[0107] In some feasible implementations, after the network device sends the fourth indication information and / or the fifth indication information, it can send a first PDCCH to a group of terminal devices (including a first terminal device, a second terminal device and a fourth terminal device) within the above-mentioned first frequency domain resources.

[0108] As an optional embodiment, the network device may broadcast the second indication information. Accordingly, the first terminal device, the second terminal device, and the third terminal device receive the second indication information respectively.

[0109] In some feasible implementations, the second indication information may include a first frequency domain width, and the first frequency domain width may be used to determine the second frequency domain resource. The second indication information may be included in a system message, and the second frequency domain resource may be a frequency domain resource configured by the system message. The starting frequency domain position of the second frequency domain resource is the RB (lowest RB) with the smallest index number (i.e., sequence number) in the control resource set (i.e., CORESET) or predefined BWP for receiving the first PDCCH (the first PDCCH here refers to the PDCCH scrambled by the G-RNTI). The first frequency domain width (i.e., the frequency domain width of the second frequency domain resource) may be the number of consecutive RBs corresponding to CORESET0, where CORESET0 is indicated by a system message or configured by high-level signaling, and the number of RBs of CORESET0 is 24, 48, or 96.

[0110] As an optional embodiment, the second indication information may also indicate the first frequency domain width, or certain parameters of the frequency domain in an implicit or other manner. The second indication information is associated with the second resource, and the terminal device can determine the second frequency domain resource based on the mapping relationship between the second indication information and the second resource.

[0111] Optionally, the first frequency domain resource and the second frequency domain resource are independently configured by the network device, that is, the configuration of the first frequency domain resource does not depend on the configuration of the second frequency domain resource, and the terminal device can directly confirm the second frequency domain resource according to the configuration of the second frequency domain resource without relying on the parameters notified in the process of configuring the first frequency domain resource. The first frequency domain resource is configured by high-level signaling, and the second frequency domain resource is configured by system message. In another embodiment, the independent configuration of the first frequency domain resource and the second frequency domain resource can be understood as: the starting frequency domain position of the first frequency domain resource is different from the starting frequency domain position of the second frequency domain resource, and / or the frequency domain width of the first frequency domain resource is different from the frequency domain width of the second frequency domain resource. It is further understandable that the starting frequency domain position of the first frequency domain resource and the second frequency domain resource are the same, and the frequency domain widths are different. Or, the starting frequency domain positions of the first frequency domain resource and the second frequency domain resource are different, and the frequency domain widths are the same. Or, the starting frequency domain positions of the first frequency domain resource and the second frequency domain resource are different, and the frequency domain widths are also different.

[0112] For example, the starting frequency domain positions of the first frequency domain resource and the second frequency domain resource are both RB15, the frequency domain width of the first frequency domain resource is 50 RBs, and the frequency domain width of the second frequency domain resource (i.e., the first frequency domain width) is 48 RBs, i.e., the first frequency domain resource is RB15 to RB65, and the second frequency domain resource is RB15 to RB63. For another example, the starting frequency domain position of the first frequency domain resource is RB5, and the starting frequency domain position of the second frequency domain resource is RB20, and the frequency domain width of the first frequency domain resource and the frequency domain width of the second frequency domain resource (i.e., the first frequency domain width) are both 96 RBs, i.e., the first frequency domain resource is RB5 to RB101, and the second frequency domain resource is RB20 to RB116. For example, the starting frequency domain position of the first frequency domain resource is RB12, the starting frequency domain position of the second frequency domain resource is RB25, the frequency domain width of the first frequency domain resource is 100 RBs, and the frequency domain width of the second frequency domain resource (ie, the first frequency domain width) is 24 RBs, that is, the first frequency domain resources are RB12 to RB112, and the second frequency domain resources are RB25 to RB49.

[0113] In some feasible implementations, DCI can be carried on PDCCH, and DCI can be used to schedule PDSCH. The fallback DCI (DCI format 1_0) can schedule the second PDSCH within the range of the above-mentioned second frequency domain resources, that is, the frequency domain resources of the second PDSCH are the second frequency domain resources. The fallback DCI can be scrambled by an RNTI different from G-RNTI. For example, the fallback DCI can be scrambled by any of the following RNTIs: cell-RNTI (C-RNTI), configured scheduling-radio network temporary identifier (CS-RNTI), temporary cell-radio network temporary identifier (TC-RNTI), paging-radio network temporary identifier (P-RNTI), system information-radio network temporary identifier (SI-RNTI), random access-radio network temporary identifier (RA-RNTI) or SPS-RNTI.

[0114] S204: The first terminal device receives the first PDCCH on the first BWP and parses the first PDCCH.

[0115] S205: The second terminal device receives the first PDCCH on the second BWP and parses the first PDCCH.

[0116] S206: The third terminal device receives the first PDCCH on the third BWP and parses the first PDCCH.

[0117] In some feasible implementations, the first terminal device may receive the fourth indication information and / or the fifth indication information. Similarly, the second terminal device may receive the fourth indication information and / or the fifth indication information; the third terminal device may receive the fourth indication information and / or the fifth indication information. The fourth indication information is used to indicate the first control resource set, and the fourth indication information includes configuration information of the first control resource set.

[0118] Optionally, the configuration information of the first control resource set may include:

[0119] (a) Configure the control resource set ID p through the controlResourceSetId parameter, where 0≤p<12;

[0120] (b) configuring the demodulation reference signal (DMRS) scrambling sequence initial value through the pdcch-DMRS-ScramblingID parameter;

[0121] (c) The precoding granularity of multiple REGs that the UE can assume to use the same DMRS precoder in the frequency domain is configured through the precoderGranularity parameter;

[0122] (d) Configure CCE to REG mapping parameters through the cce-REG-MappingType parameter;

[0123] (e) selecting one antenna port quasi-co-location from a group of antenna port quasi-co-locations indicated by the TCI-Stat parameter to indicate the quasi-co-location information of the DMRS antenna port for receiving the PDCCH in each CORESET;

[0124] (f) The TCI-PresentInDCI parameter indicates whether there is transmission configuration indication (TCI) in the DCI format 1_1 transmitted via the PDCCH in CORESET p.

[0125] The fifth indication information is used to indicate the first common search space associated with the first control resource set. For each downlink BWP, each terminal device may be configured with S search space sets, where S is greater than 0 and not greater than 10. For each search space in the S search space sets, the network device configures the terminal device through signaling:

[0126] (A) Configure the search space set index s through the searchSpaceId parameter, 0≤s<40;

[0127] (B) configuring the association between the search space set s and the control resource set p through the controlResourceSetId parameter;

[0128] (C) Configure the PDCCH detection period k through the monitoringSlotPeriodicityAndOffset parameter s time unit and PDCCH detection offset O s A time unit, wherein the time unit can be a time slot, a sub-time slot, a mini-time slot, or an OFDM symbol;

[0129] (D) The monitoringSymbolsWithinSlot parameter is used to configure the PDCCH detection mode in a time unit, indicating the first symbol of the CORESET used for PDCCH detection in a time unit. The time unit can be a time slot, a sub-time slot, or a mini-time slot;

[0130] (E) Configure the duration T through the duration parameter s <k s A time unit indicates the number of time units where the search space set s is located. The time unit can be a time slot, a sub-time slot, or a micro-time slot;

[0131] (F) indicating through the searchSpaceType parameter whether the search space set s is a common search space or a UE-specific search space;

[0132] (G) The number of PDCCH candidates for each CCE aggregation level L is indicated by the nrofCandidates parameter.

[0133] Therefore, the first terminal device can receive the first PDCCH sent by the network device on the first BWP (i.e., the activated BWP of the first terminal device) or in the first frequency domain resource according to the first control resource set and the first common search space. After receiving the first PDCCH, the first terminal device can parse the first PDCCH in the first frequency domain resource to obtain the DCI carried by the first PDCCH. It is understandable that the parsing range of the first PDCCH can be the first frequency domain resource. It is also understandable that the range indicated by the frequency domain resource allocation information field of the first PDCCH does not exceed the first frequency domain resource. Alternatively, after receiving the first PDCCH, the first terminal device can parse the first PDCCH in the frequency domain resource corresponding to the first BWP to obtain the DCI carried by the first PDCCH. It is understandable that the parsing range of the first PDCCH can also be the frequency domain resource corresponding to the first BWP. It is also understandable that the range indicated by the frequency domain resource allocation information field of the first PDCCH does not exceed the frequency domain resource corresponding to the first BWP. Among them, the parsing process may include demodulation, decoding and other processing. The DCI carried on the first PDCCH may include one or more of the following information: time domain resource allocation information of PDSCH, frequency domain resource allocation information, modulation and coding scheme (MCS), redundancy version, HARQ process number, downlink allocation index, power control command for scheduling physical uplink control channel (PUCCH), PUCCH resource indicator, and feedback timing indicator from PDSCH to HARQ.

[0134] For example, Figure 4 As shown, Figure 4 Schematic diagram of the parsing range of the first PDCCH provided in the embodiment of the present application. Assume that the frequency domain resources corresponding to the first BWP include 6 RBs, and these 6 RBs are indicated by 6 bits respectively. Assume that the first frequency domain resources are the middle 4 RBs of these 6 RBs, and are indicated by the middle 4 bits of these 6 bits respectively. Figure 4 As shown in 4a of FIG. 4 , the first terminal device can parse the first PDCCH on the RB indicated by the middle 4 bits, that is, the parsing range of the first PDCCH is the RB indicated by the middle 4 bits. Or, as Figure 4As shown in 4b, the first terminal device can parse the first PDCCH on the RB indicated by the 6 bits, that is, the parsing range of the first PDCCH is the RB indicated by the 6 bits. Among them, the first bit and the last bit of the 6 bits can be set to 0 to make them invalid, that is, the first RB and the last RB in the frequency domain resources corresponding to the first BWP may not carry information (that is, the carried information is empty) or carry control information for unicast transmission.

[0135] In some feasible implementations, the specific implementation of the first terminal device receiving the first PDCCH sent by the network device on the first BWP according to the first control resource set and the first public search space can be as follows: the first terminal device receives the first PDCCH in the first control resource set and detects the first PDCCH in the first public search space. The first public search space may include candidate PDCCHs. The first terminal device decodes and performs a cyclic redundancy check (CRC) on all candidate PDCCHs in the first public search space. If the CRC check passes, it is considered that the content of the decoded PDCCH is valid for the first terminal device, and the information obtained by decoding (such as transmission scheduling indication, time slot format indication, power control command, etc.) is used for subsequent operations.

[0136] In some feasible implementations, similar to the aforementioned first terminal device, the second terminal device can receive the above-mentioned first PDCCH sent by the network device on the above-mentioned second BWP (i.e., the activated BWP of the second terminal device), and can parse the first PDCCH in the above-mentioned first frequency domain resources or in the frequency domain resources corresponding to the second BWP to obtain the DCI carried on the first PDCCH. The third terminal device can receive the above-mentioned first PDCCH sent by the network device on the above-mentioned third BWP (i.e., the activated BWP of the third terminal device), and can parse the first PDCCH in the above-mentioned first frequency domain resources or in the frequency domain resources corresponding to the third BWP to obtain the DCI carried on the first PDCCH. It can be understood that the implementation process of the second terminal device and the third terminal device can refer to the implementation of the aforementioned first terminal device, which will not be repeated here. Since the first frequency domain resources are a subset or a true subset of the intersection of the frequency domain resources corresponding to the first BWP, the frequency domain resources corresponding to the second BWP, and the frequency domain resources corresponding to the third BWP, the first terminal device, the second terminal device, and the third terminal device can all receive the first PDCCH on the same frequency domain resources (i.e., the first frequency domain resources), and parse it to obtain DCI.

[0137] S207: The network device sends a first PDSCH on a first frequency domain resource.

[0138] In some feasible implementations, the first PDSCH may carry broadcast / multicast / groupcast user data information. The frequency domain resources corresponding to the first PDSCH may be the same as the first frequency domain resources, or may not be exactly the same. For example, the starting RB position of the first PDSCH is the same as the starting RB position of the first frequency domain resource, and the number of RBs of the first PDSCH is the same as the number of RBs of the first frequency domain resource. Alternatively, the starting RB position of the first PDSCH is the same as the starting RB position of the first frequency domain resource, and the number of RBs of the first PDSCH is less than the number of RBs of the first frequency domain resource, or the starting RB position of the first PDSCH is different from the starting RB position of the first frequency domain resource, and the number of RBs of the first PDSCH is less than the number of RBs of the first frequency domain resource. In another embodiment, the same or different starting positions mentioned here can be replaced by the same or different ending positions, respectively, and the starting position can also refer to RB numbering starting from the lowest RB of the CORESET in which the DCI was received. The network device may send a first PDSCH to a group of terminal devices (including a first terminal device, a second terminal device, and a third terminal device) on the first frequency domain resources.

[0139] In the embodiment of the present application, by configuring the frequency domain resources corresponding to the first PDSCH to be the same as or not completely the same as the first frequency domain resources, and because the first frequency domain resources are more flexible (this is because the first frequency domain resources are a subset or a true subset of the intersection of the frequency domain resources corresponding to the activated BWP of a group of terminal devices), the flexibility of the frequency domain resource configuration of the multicast transmission can be improved, that is, the starting RB position and the number of RBs of the first PDSCH can be flexibly configured and non-fixed, that is, the number of RBs of the broadcast / multicast / multicast PDSCH is not limited to one or several fixed values ​​(such as 24, 48 or 96 RBs corresponding to CORESET0), it can be any value, and the number of RBs of the PDSCH can be determined according to the size of the user data of the broadcast / multicast / multicast transmission.

[0140] In some feasible implementations, the execution order between step S207 and step S204-step S206 of the embodiment of the present application is not limited. For example, step S207 can be executed before step S204-step S206, step S207 can also be executed after step S204-step S206, step S207 can also be executed simultaneously with step S204-step S206, and so on.

[0141] S208, the first terminal device, the second terminal device and the third terminal device receive the first PDSCH on the first frequency domain resources.

[0142] In some feasible implementations, the first terminal device can receive the first PDSCH sent by the network device on the first BWP (i.e., the activated BWP of the first terminal device) or the first frequency domain resource, and can demodulate, decode, and perform other operations on the first PDSCH in the first frequency domain resource according to the DCI carried by the first PDCCH to obtain the broadcast / multicast / groupcast user data information carried by the first PDSCH. It can be understood that the resolution range of the first PDSCH can be the first frequency domain resource. Among them, the frequency domain position corresponding to the first PDSCH can be the same as the frequency domain position of the first frequency domain resource (i.e., the same starting RB position), and the bandwidth corresponding to the first PDSCH (i.e., the frequency domain width) can also be the same as the bandwidth of the first frequency domain resource (i.e., the same number of RBs). Optionally, the frequency domain resource corresponding to the first PDSCH can be a subset or a true subset of the first frequency domain resource. The terminal device of the embodiment of the present application receives the first PDCCH within its own activated BWP, and receives the first PDSCH scheduled by the first PDCCH within its own activated BWP or the first frequency domain resources, and parses the first PDSCH within the first frequency domain resources to obtain the broadcast / multicast / multicast user data information carried on the first PDSCH, thereby realizing broadcast / multicast / multicast communication and realizing broadcast / multicast / multicast data transmission on a unified frequency domain resource.

[0143] Similarly, the second terminal device can receive the above-mentioned first PDSCH sent by the network device on the above-mentioned second BWP or the above-mentioned first frequency domain resources, and can demodulate, decode and other operations on the first PDSCH in the above-mentioned first frequency domain resources according to the DCI carried by the above-mentioned first PDCCH, so as to obtain the user data of broadcast / multicast / groupcast carried by the first PDSCH. Similarly, the third terminal device can receive the above-mentioned first PDSCH sent by the network device on the above-mentioned third BWP or the first frequency domain resources, and can demodulate, decode and other operations on the first PDSCH in the above-mentioned first frequency domain resources according to the DCI carried by the above-mentioned first PDCCH, so as to obtain the user data of broadcast / multicast / groupcast carried by the first PDSCH.

[0144] In an embodiment of the present application, on the one hand, the network device configures the first frequency domain resources for broadcast / multicast / multicast transmission in the frequency domain resources corresponding to the terminal device dedicated BWP (UE dedicated BWP). When the terminal device needs to receive unicast transmission, the UE dedicated BWP will be activated. At the same time, the terminal device can also receive multicast transmission in the activated BWP (this is because part of the frequency domain resources of the activated BWP are configured for broadcast / multicast / multicast transmission), that is, unicast and multicast transmission can be completed within one BWP. Therefore, there is no need to additionally configure the working bandwidth for broadcast / multicast / multicast transmission. When the terminal device needs to frequently receive unicast transmission and multicast transmission, there is no need to switch back and forth between the unicast working bandwidth and the multicast working bandwidth, thereby saving switching delay. On the other hand, when the UE dedicated BWP of one or several terminal devices in a group of terminal devices is switched, the first frequency domain resources for broadcast / multicast / multicast transmission will switch with the switching of the UE dedicated BWP, that is, when the UE dedicated BWP changes, the first frequency domain resources also change accordingly. This is because the first frequency domain resource is a subset or a true subset of the intersection of frequency domain resources corresponding to the activated BWPs of a group of terminal devices, so that dynamic switching of UE dedicated BWPs can also be supported during broadcast / multicast / groupcast transmission.

[0145] The communication method of the embodiment of the present application is described in detail above. In order to facilitate better implementation of the above scheme of the embodiment of the present application, the embodiment of the present application also provides corresponding equipment.

[0146] See also Figure 5 , Figure 5 Schematic diagram of the structure of the terminal device provided in the embodiment of the present application. Figure 5 As shown, the terminal device 100 may include:

[0147] The first transceiver unit 101 is used to receive the first indication information, receive the first PDCCH on the first BWP, receive the second indication information, and receive the first PDSCH scheduled by the first PDCCH in the first frequency domain resource indicated by the first indication information. The first indication information can be used to indicate the first frequency domain resource, and the first frequency domain resource can be a subset or a true subset of the frequency domain resource corresponding to the first BWP. The first BWP is a terminal device-specific BWP. The first PDCCH can be scrambled by the G-RNTI, and the first PDSCH can be scheduled within the range of the first frequency domain resource, that is, the indication range of the frequency domain resource allocation information domain of the first PDCCH is the first frequency domain resource. The resolution range of the first PDSCH is the first frequency domain resource. The second indication information may include a first frequency domain width, and the first frequency domain width can be used to determine the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are independently configured by the network device, that is, the configuration of the first frequency domain resource does not depend on the configuration of the second frequency domain resource, and the terminal device can directly confirm the second frequency domain resource according to the configuration of the second frequency domain resource without relying on the parameters notified during the configuration of the first frequency domain resource. It can be understood that the starting frequency domain position of the first frequency domain resource is different from the starting frequency domain position of the second frequency domain resource, and / or the frequency domain width of the first frequency domain resource is different from the frequency domain width of the second frequency domain resource.

[0148] Optionally, the starting frequency domain position of the second frequency domain resource is the RB (lowestRB) with the smallest index number (i.e., sequence number) in the control resource set (i.e., CORESET) or predefined BWP for receiving the first PDCCH (the first PDCCH here refers to the PDCCH encrypted by G-RNTI). The frequency domain width (i.e., the first frequency domain width) of the second frequency domain resource can be the number of consecutive RBs corresponding to CORESET0, where CORESET0 can be indicated by a system message or configured by high-level signaling, and the number of RBs of CORESET0 is 24, 48, or 96.

[0149] In some feasible implementation manners, the first transceiver unit 101 is specifically configured to: receive a first PDCCH in the first frequency domain resource.

[0150] In some feasible implementations, the first transceiver unit 101 is further used to receive third indication information, where the third indication information is used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

[0151] In some feasible implementations, the first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes a subcarrier spacing and a cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP.

[0152] In some feasible implementations, the terminal device 100 may further include a processing unit 102, where the processing unit 102 is configured to parse the first PDSCH received by the transceiver unit 101 to obtain user data information carried on the first PDSCH.

[0153] In the specific implementation, the implementation of each module or unit can also refer to Figure 2 The corresponding description of the terminal device in the method embodiment shown executes the method and functions executed by the terminal device in the above embodiment.

[0154] The terminal device of the embodiment of the present application receives the first frequency domain resource indicated by the network device through the indication information, receives and parses the first PDSCH scheduled by the first PDCCH on this first frequency domain resource to obtain the user data carried on the first PDSCH. Because the first PDCCH is scrambled by the G-RNTI, it means that the first PDCCH is a PDCCH for broadcast / multicast / groupcast transmission, and it also means that the data carried on the first PDSCH scheduled by the first PDCCH is broadcast / multicast / groupcast transmission data. Therefore, the communication method provided in the embodiment of the present application can realize broadcast / multicast / groupcast communication for 5G NR, and can realize broadcast / multicast / groupcast data transmission on a unified frequency domain resource (first frequency domain resource).

[0155] See also Figure 6 , Figure 6 Schematic diagram of the structure of the network device provided in the embodiment of the present application. Figure 6 As shown, the network device 200 may include:

[0156] The second transceiver unit 201 is used to send first indication information and a first PDCCH indicating a first frequency domain resource, send second indication information including a first frequency domain width, and send a first PDSCH on the first frequency domain resource. The first indication information can be used to indicate the first frequency domain resource, and the first frequency domain resource can be a subset or a true subset of the frequency domain resource corresponding to the first BWP. The first BWP is a terminal device-specific BWP. The first PDCCH can be scrambled by the G-RNTI, and the first PDSCH can be scheduled within the range of the first frequency domain resource, that is, the indication range of the frequency domain resource allocation information domain of the first PDCCH is the first frequency domain resource. The parsing range of the first PDSCH is the first frequency domain resource. The second indication information may include a first frequency domain width, and the first frequency domain width can be used to determine the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are independently configured by the network device, that is, the configuration of the first frequency domain resource does not depend on the configuration of the second frequency domain resource, and the terminal device can directly confirm the second frequency domain resource according to the configuration of the second frequency domain resource without relying on the parameters notified in the process of configuring the first frequency domain resource. It can be understood that the starting frequency domain position of the first frequency domain resource is different from the starting frequency domain position of the second frequency domain resource, and / or the frequency domain width of the first frequency domain resource is different from the frequency domain width of the second frequency domain resource.

[0157] Optionally, the starting frequency domain position of the second frequency domain resource is the RB (lowest RB) with the smallest index number (i.e., sequence number) in the control resource set (i.e., CORESET) or predefined BWP for receiving the first PDCCH (the first PDCCH here refers to the PDCCH encrypted by G-RNTI). The frequency domain width (i.e., the first frequency domain width) of the second frequency domain resource can be the number of consecutive RBs corresponding to CORESET0, where CORESET0 can be indicated by a system message or configured by high-level signaling, and the number of RBs of CORESET0 is 24, 48, or 96.

[0158] In some feasible implementation manners, the network device 200 further includes a determining unit 202. The determining unit 202 is configured to determine the first frequency domain resource before sending the first indication information.

[0159] In some feasible implementation manners, the second transceiver unit 201 is specifically configured to send the first PDCCH in the first frequency domain resource.

[0160] In some feasible implementations, the second transceiver unit 201 is further used to send third indication information, where the third indication information is used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

[0161] In some feasible implementations, the first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes a subcarrier spacing and a cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP.

[0162] The determination unit 202 may be a processing unit.

[0163] In the specific implementation, the implementation of each module or unit can also refer to Figure 2 The corresponding description of the network device in the method embodiment shown executes the method and functions executed by the network device in the above embodiment.

[0164] The network device of the embodiment of the present application configures the first frequency domain resource for broadcast / multicast / multicast transmission in the frequency domain resource corresponding to the terminal device dedicated BWP (UE dedicated BWP). When the terminal device needs to receive unicast transmission, the UE dedicated BWP will be activated. At the same time, the terminal device can also receive multicast transmission in the activated BWP (this is because part of the frequency domain resources of the activated BWP are configured for broadcast / multicast / multicast transmission), that is, unicast and multicast transmission can be completed within one BWP. Therefore, there is no need to additionally configure the working bandwidth for broadcast / multicast / multicast transmission. When the terminal device needs to frequently receive unicast transmission and multicast transmission, it does not need to switch back and forth between the unicast working bandwidth and the multicast working bandwidth, thereby saving switching delay.

[0165] See also Figure 7 , Figure 7 Schematic diagram of the structure of the communication device provided in the embodiment of the present application. Figure 7 As shown, the communication device 1000 provided in the embodiment of the present application includes a processor 1001, a memory 1002, a transceiver 1003 and a bus system 1004. The communication device provided in the embodiment of the present application can be any one of a terminal device and a network device.

[0166] The processor 1001 , memory 1002 and transceiver 1003 are connected via a bus system 1004 .

[0167] The memory 1002 is used to store programs. Specifically, the program may include program code, and the program code includes computer operation instructions. The memory 1002 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), or portable read-only memory (CD-ROM). Figure 7 Only one memory is shown in the figure, of course, the memory can also be set to multiple as needed. The memory 1002 can also be the memory in the processor 1001, which is not limited here.

[0168] The memory 1002 stores the following elements, executable units or data structures, or a subset thereof, or an extended set thereof:

[0169] Operation instructions: include various operation instructions, used to implement various operations.

[0170] Operating system: includes various system programs used to implement various basic businesses and handle hardware-based tasks.

[0171] The processor 1001 controls the operation of the communication device 1000. The processor 1001 may be one or more central processing units (CPUs). When the processor 1001 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0172] In a specific application, the components of the communication device 1000 are coupled together via a bus system 1004, wherein the bus system 1004 may include a power bus, a control bus, and a status signal bus in addition to a data bus. Figure 7 In the figure, various buses are labeled as bus system 1004. For convenience of representation, Figure 7 The drawing is only schematic.

[0173] The above embodiments of the present application provide Figure 2 A method for a terminal device; or the above-mentioned embodiment of the present application provided Figure 2The method of the network device can be applied to the processor 1001, or implemented by the processor 1001. The processor 1001 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 1001. The above-mentioned processor 1001 can be a general-purpose processor, a digital signal processor (digital signal processing, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field-programmable gate array (field-programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor are combined and executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and executes the Figure 2 The method steps of the terminal device described; or combined with its hardware execution Figure 2 Method steps of the described network device.

[0174] The present application also provides a computer program product, which includes a computer program code. When the computer program code is run on a computer, the computer executes Figure 2 The method steps of the terminal device described; or when the computer program code is run on a computer, the computer is caused to execute Figure 2 Method steps of the described network device.

[0175] The present application also provides a chip, including a processor. The processor is used to read and execute a computer program stored in a memory to perform Figure 2The communication method in any possible implementation manner. Optionally, the chip also includes a memory, and the memory is connected to the processor through a circuit or wire. Further optionally, the chip also includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive data and / or information to be processed, and the processor obtains the data and / or information from the communication interface, processes the data and / or information, and outputs the processing result through the communication interface. The communication interface can be an input and output interface.

[0176] Optionally, the processor and memory mentioned above may be physically independent units, or the memory may be integrated with the processor.

[0177] In another embodiment of the present application, a communication system is further provided, the communication system comprising a terminal and a base station. Figure 2 Any terminal device in the communication method provided, or the terminal in the communication system may be the above Figure 5 The terminal device 100. The base station in the communication system can be Figure 2 The network device in the communication method provided, or the base station in the communication system may be the above-mentioned Figure 6 The network device 200.

[0178] Those skilled in the art can understand that to implement all or part of the processes in the above-mentioned embodiments, the processes can be completed by computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. When the programs are executed, they can include the processes of the above-mentioned method embodiments. The aforementioned storage media include: ROM or random access memory RAM, magnetic disk or optical disk and other media that can store program codes.

[0179] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: The terminal device receives first indication information, where the first indication information is used to indicate a first frequency domain resource, where the first frequency domain resource is a subset of frequency domain resources corresponding to a first bandwidth BWP, and the first BWP is an activated BWP for the terminal device; The terminal device receives a first physical downlink control channel PDCCH on the first BWP, where the first PDCCH is scrambled by a group-radio network temporary identifier G-RNTI, and the first PDCCH schedules a first downlink shared physical channel PDSCH within the range of the first frequency domain resources; The terminal device receives second indication information, where the second indication information includes a first frequency domain width, where the first frequency domain width is used to determine a second frequency domain resource, where a starting frequency domain position of the second frequency domain resource is a resource block RB with the smallest sequence number in a control resource set or a predefined BWP for receiving the first PDCCH; The terminal device receives the first PDSCH on the first frequency domain resources.

2. The method according to claim 1, characterized in that The terminal device receiving a first physical downlink control channel PDCCH on the first BWP includes: The terminal device receives the first PDCCH in the first frequency domain resources.

3. The method according to claim 1 or 2, characterized in that: Before the terminal device receives a first physical downlink control channel PDCCH on the first BWP, the method further includes: The terminal device receives third indication information, where the third indication information is used to indicate the format of downlink control information DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

4. The method according to claim 1 or 2, characterized in that: The first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes a subcarrier spacing and a cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP.

5. The method according to claim 1 or 2, characterized in that: The first frequency domain width is the number of consecutive RBs corresponding to the control resource set CORESET 0.

6. A communication method, characterized in that: include: The network device sends first indication information, where the first indication information is used to indicate a first frequency domain resource, where the first frequency domain resource is a subset of an intersection of frequency domain resources corresponding to a terminal device activation BWP of each terminal device in a group of terminal devices; The network device sends a first PDCCH, where the first PDCCH is scrambled by the G-RNTI, and the first PDCCH schedules a first PDSCH within a range of the first frequency domain resources; The network device sends second indication information, where the second indication information includes a first frequency domain width, where the first frequency domain width is used to determine a second frequency domain resource, where a starting frequency domain position of the second frequency domain resource is a resource block RB with the smallest sequence number in a control resource set or a predefined BWP for receiving the first PDCCH; The network device sends the first PDSCH on the first frequency domain resources.

7. The method according to claim 6, characterized in that The network device sending the first PDCCH includes: The network device sends a first PDCCH in the first frequency domain resources.

8. The method according to claim 6 or 7, characterized in that: Before the network device sends the first PDCCH, the method further includes: The network device sends third indication information, where the third indication information is used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

9. The method according to claim 6 or 7, characterized in that: The first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes subcarrier spacing and cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the terminal device activating BWP.

10. The method according to claim 6 or 7, characterized in that: The first frequency domain width is the number of consecutive RBs corresponding to the control resource set CORESET 0.

11. A terminal device, characterized in that: include: A first transceiver unit, configured to receive first indication information, where the first indication information is used to indicate a first frequency domain resource, where the first frequency domain resource is a subset of frequency domain resources corresponding to a first BWP, where the first BWP is an activated BWP for the terminal device; The first transceiver unit is further configured to receive a first PDCCH on the first BWP, where the first PDCCH is scrambled by the G-RNTI, and the first PDCCH schedules a first PDSCH within the range of the first frequency domain resources; The first transceiver unit is further used to receive second indication information, where the second indication information includes a first frequency domain width, where the first frequency domain width is used to determine a second frequency domain resource, where a starting frequency domain position of the second frequency domain resource is a resource block RB with the smallest sequence number in a control resource set or a predefined BWP for receiving the first PDCCH; The first transceiver unit is further used to receive the first PDSCH on the first frequency domain resources.

12. The terminal device according to claim 11, characterized in that: The first transceiver unit is specifically used for: A first PDCCH is received in the first frequency domain resources.

13. The terminal device according to claim 11 or 12, characterized in that: The first transceiver unit is further used to receive third indication information, where the third indication information is used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

14. The terminal device according to claim 11 or 12, characterized in that: The first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes a subcarrier spacing and a cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the first BWP.

15. The terminal device according to claim 11 or 12, characterized in that: The first frequency domain width is the number of consecutive RBs corresponding to the control resource set CORESET 0.

16. A network device, characterized in that: include: A second transceiver unit, configured to send first indication information, where the first indication information is used to indicate a first frequency domain resource, where the first frequency domain resource is a subset of an intersection of frequency domain resources corresponding to a terminal device activation BWP of each terminal device in a group of terminal devices; The second transceiver unit is further configured to send a first PDCCH, where the first PDCCH is scrambled by the G-RNTI, and the first PDCCH schedules a first PDSCH within the range of the first frequency domain resources; The second transceiver unit is further used to send second indication information, where the second indication information includes a first frequency domain width, where the first frequency domain width is used to determine a second frequency domain resource, where a starting frequency domain position of the second frequency domain resource is a resource block RB with the smallest sequence number in a control resource set or a predefined BWP for receiving the first PDCCH; The second transceiver unit is further configured to send the first PDSCH on the first frequency domain resources.

17. The network device according to claim 16, characterized in that: The second transceiver unit is specifically used for: A first PDCCH is sent in the first frequency domain resources.

18. The network device according to claim 16 or 17, characterized in that: The second transceiver unit is also used for: Send third indication information, where the third indication information is used to indicate the format of the DCI carried by the first PDCCH, wherein the format of the DCI carried by the first PDCCH is non-fallback DCI.

19. The network device according to claim 16 or 17, characterized in that: The first indication information includes at least one of the starting frequency domain position, frequency domain width or parameter set of the first frequency domain resource, the parameter set includes subcarrier spacing and cyclic prefix, and the parameter set of the first frequency domain resource is the same as the parameter set of the terminal device activating BWP.

20. The network device according to claim 16 or 17, characterized in that: The first frequency domain width is the number of consecutive RBs corresponding to the control resource set CORESET 0.

21. A terminal device, characterized in that: It comprises a processor, a transceiver and a memory, wherein the memory is used to store a computer program, the transceiver is used to send and receive information, the computer program comprises program instructions, and when the processor runs the program instructions, the terminal device executes the method as described in any one of claims 1 to 5.

22. A network device, characterized in that: It comprises a processor, a transceiver and a memory, wherein the memory is used to store a computer program, the transceiver is used to send and receive information, the computer program comprises program instructions, and when the processor runs the program instructions, the network device executes the method as described in any one of claims 6 to 10.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed on the computer, the computer is enabled to execute the method according to any one of claims 1 to 5.

24. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed on the computer, the computer is caused to execute the method according to any one of claims 6 to 10.

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