Communication method and device

Abstract

The invention discloses a communication method and device, so that network equipment can distinguish CSI (Channel State Information) on different frequency domain resources and reasonably allocate the frequency domain resources. The method comprises the following steps: receiving first information, wherein the first information is used for indicating that a mode for sending CSI is a sub-band CSI reporting mode; then transmitting at least two pieces of CSI; the at least two pieces of CSI are determined according to the at least two sub-bands, the at least two pieces of CSI are in one-to-one correspondence with the at least two sub-bands, and the at least two sub-bands are determined according to the first frequency domain resource and the second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource. In the subband CSI reporting mode, at least two subbands are determined according to the first frequency domain resource and the second frequency domain resource to determine at least two pieces of CSI, so that the CSI reported for the subbands is reported by clear resources, the reported CSI is more accurate, and the network equipment distinguishes the CSI on different frequency domain resources, so that the network equipment reasonably allocates the frequency domain resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. BACKGROUND

[0002] In a time division duplexing (TDD) system, downlink (DL) usually occupies the main time resource, which causes the coverage imbalance between DL and uplink (UL), resulting in poor uplink coverage and large delay in the TDD system. To solve the problem of uplink coverage and delay in the TDD system, a subband full duplex (SBFD) scheme and an in band full duplex (IBFD) scheme are proposed.

[0003] In the SBFD scheme, one carrier can be divided into multiple subbands, and the transmission directions of different subbands can be different. Under the SBFD scheme, the available uplink transmission resources of a terminal device are increased, which can effectively improve the uplink coverage and reduce the uplink delay. The SBFD can include two modes: subband overlapping full duplex and subband non-overlapping full duplex. For the subband non-overlapping full duplex, the subband configurations of the whole network are the same; for the subband overlapping full duplex, the subband configurations of the whole network can be different.

[0004] The IBFD can simultaneously perform uplink transmission and downlink transmission on the same time-frequency resource. Compared with TDD and SBFD, the IBFD has more uplink resources and downlink resources to improve the uplink performance and downlink performance, and can also effectively reduce the delay.

[0005] Compared with TDD, SBFD and IBFD introduce additional cross link interference (CLI), including CLI between network devices, etc. In order to reduce interference, the network device adopts a CLI suppression technique on the overlapping frequency domain resource in the sub-band overlapping full duplex scheme (i.e. the frequency domain resource corresponding to the sub-band configured with different transmission directions of the same frequency domain resource) or the full duplex frequency domain resource in the IBFD scheme, to suppress the interference of the downlink signal to the adjacent network device. For example: reducing the transmit power spectral density (PSD) on the overlapping frequency domain resource or the full duplex frequency domain resource, etc. The above interference suppression method will cause the PSD on the overlapping frequency domain resource or the full duplex frequency domain resource to be very different from that on other downlink frequency domain resources, further causing the channel state information (CSI) between the network device and the terminal device to be very different. However, at present, in the IBFD and SBFD sub-band overlapping full duplex scenarios, the network device may not be able to distinguish the CSI on different frequency domain resources, thereby causing the network device to be unable to reasonably allocate frequency domain resources. SUMMARY

[0006] Embodiments of the present application provide a communication method and device to enable the network device to distinguish the CSI on different frequency domain resources, thereby reasonably allocating frequency domain resources.

[0007] In a first aspect, the present application provides a communication method, which can be applied to a communication device. The communication device can be a terminal device, or can be a component (such as a processor, a chip, a chip system, a circuit, or a functional module, etc.) in the terminal device. The method can include: receiving first information, the first information being used to indicate that the sending CSI mode is a sub-band CSI reporting mode; then sending at least two CSIs; wherein the at least two CSIs are determined according to at least two sub-bands, the at least two CSIs correspond to the at least two sub-bands one by one, and the at least two sub-bands are determined according to the first frequency domain resource and the second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

[0008] Based on the above communication method, in the sub-band CSI reporting mode, by determining the at least two CSIs according to the at least two sub-bands determined according to the first frequency domain resource and the second frequency domain resource, the CSI reported on the sub-band can be reported on a clear resource, the reported CSI is more accurate, the network device can distinguish the CSI on different frequency domain resources, and the network device can reasonably allocate frequency domain resources.

[0009] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource, and the multiple subbands include the at least two subbands. The multiple subbands can satisfy one or more of the following conditions: each subband is continuous in the frequency domain; each two subbands do not overlap in the frequency domain; each subband only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource; a union of the multiple subbands in the frequency domain is equal to a bandwidth part (BWP); each subband includes a maximum of N frequency domain units, where N is a positive integer; or, two adjacent subbands that include a number of frequency domain units less than N do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time. By satisfying the above conditions for the subbands, the CSI reported for the subbands can be explicitly reported on the resources, and the reported CSI is more accurate.

[0010] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource. The method can include the following steps: determining multiple frequency unit groups, where each frequency unit group includes N frequency units, and the multiple frequency unit groups are continuous in the frequency domain, where N is a positive integer; determining at least one subband for each frequency unit group that overlaps with the first frequency domain resource, and / or determining at least one subband for each frequency unit group that overlaps with the second frequency domain resource, to obtain the multiple subbands. In this way, the multiple subbands can be accurately determined according to the first frequency domain resource and the second frequency domain resource.

[0011] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource. The method can include the following steps: for the first frequency domain resource and the second frequency domain resource, respectively performing the following operations to obtain the multiple subbands: determining a size of a first subband according to an index of a starting frequency unit of a target frequency domain resource, a number of frequency units included in the target frequency domain resource, and N, where N is a positive integer; determining a size of each subband other than the first subband and a last subband as N; and determining a size of the last subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and the size of the first subband and the size of the other subbands, where the target frequency domain resource is the first frequency domain resource or the second frequency domain resource. In this way, the multiple subbands can be accurately determined according to the first frequency domain resource and the second frequency domain resource.

[0012] In a possible design, second information is received, where the second information is used to indicate the first frequency domain resource and / or the second frequency domain resource. In this way, the network device can allocate the first frequency domain resource and / or the second frequency domain resource, so that the terminal device determines the multiple subbands.

[0013] In a possible design, the first information is further used to indicate a number of subbands, and the number of subbands is 20, 21, or 22. In this way, more subbands can be indicated.

[0014] In a possible design, the first information is further used to indicate a set of subbands, and the at least two subbands are included in the set of subbands. In this way, the terminal device can report CSI for subbands, so that the terminal device can accurately report corresponding CSI.

[0015] In a possible design, the CSI includes a precoding matrix indication (PMI) and / or a channel quality indicator (CQI).

[0016] In a second aspect, a communication method is provided. The method can be applied to a communication apparatus, which can be a network device or a component (e.g., a processor, a chip, a chip system, a circuit, or a functional module) in a network device. The method can include: sending first information, the first information being used to indicate that a CSI sending manner is a subband CSI reporting manner; and receiving at least two CSIs, wherein the at least two CSIs are determined according to at least two subbands, the at least two CSIs correspond to the at least two subbands in a one-to-one manner, and the at least two subbands are determined according to a first frequency domain resource and a second frequency domain resource, the first frequency domain resource being a flexible frequency domain resource, and the second frequency domain resource being a downlink frequency domain resource.

[0017] Based on the above communication method, in the subband CSI reporting manner, the at least two CSIs are determined according to the first frequency domain resource and the second frequency domain resource to determine the at least two subbands, so that the CSI reported for the subbands can be explicitly reported, the reported CSI is more accurate, and the network device can distinguish the CSI on different frequency domain resources, so that the network device can reasonably allocate frequency domain resources.

[0018] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource, and the multiple subbands include the at least two subbands. The multiple subbands can satisfy one or more of the following conditions: each subband is continuous in the frequency domain; each two subbands do not overlap in the frequency domain; each subband only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource; a union of the multiple subbands in the frequency domain is equal to a bandwidth part (BWP); each subband includes a maximum of N frequency domain units, where N is a positive integer; or, two adjacent subbands that include a number of frequency domain units less than N do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time. By satisfying the above conditions for the subbands, the CSI reported for the subbands can be explicitly reported on the resources, and the reported CSI is more accurate.

[0019] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource. The method can include: determining multiple frequency unit groups, where one frequency unit group includes N frequency units, and the multiple frequency unit groups are continuous in the frequency domain, where N is a positive integer; determining at least one subband for a frequency unit in each frequency unit group that overlaps with the first frequency domain resource, and / or determining at least one subband for a frequency unit in each frequency unit group that overlaps with the second frequency domain resource, to obtain the multiple subbands. In this way, the multiple subbands can be accurately determined according to the first frequency domain resource and the second frequency domain resource.

[0020] In a possible design, the multiple subbands are determined according to the first frequency domain resource and the second frequency domain resource. The method can include: performing the following operations for the first frequency domain resource and the second frequency domain resource, respectively, to obtain the multiple subbands: determining a size of a first subband according to an index of a starting frequency unit of a target frequency domain resource, a number of frequency units included in the target frequency domain resource, and N, where N is a positive integer; determining a size of each subband other than the first subband and a last subband as N; and determining a size of the last subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and the size of the first subband and the size of the other subbands, where the target frequency domain resource is the first frequency domain resource or the second frequency domain resource. In this way, the multiple subbands can be accurately determined according to the first frequency domain resource and the second frequency domain resource.

[0021] In a possible design, the second information is sent, where the second information is used to indicate the first frequency domain resource and / or the second frequency domain resource. In this way, the network device can allocate the first frequency domain resource and / or the second frequency domain resource, so that the terminal device determines the multiple subbands.

[0022] In one possible design, the first information is further used to indicate a number of subbands, and the number of subbands is 20, 21, or 22. This can indicate more subbands.

[0023] In one possible design, the first information is further used to indicate a set of subbands, and the at least two subbands are included in the set of subbands. This can indicate the subbands for which the terminal device reports CSI, so that the terminal device can accurately report the corresponding CSI.

[0024] In one possible design, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0025] In a third aspect, a communication method is provided. The method can be applied to a communication apparatus, which can be a terminal device or a component (e.g., a processor, a chip, a chip system, a circuit, or a functional module) in a terminal device. The method can include receiving first information, the first information being used to indicate that a CSI reporting manner is a wideband CSI reporting manner; and transmitting two CSIs, one of the two CSIs being determined based on a first frequency domain resource and the other of the two CSIs being determined based on a second frequency domain resource, the first frequency domain resource being a flexible frequency domain resource, and the second frequency domain resource being a downlink frequency domain resource.

[0026] Based on the above method, in the wideband CSI reporting manner, different frequency domain resources can correspond to different CSIs, respectively, so that the reported CSI can be more accurate, and a network device can distinguish the CSI on different frequency domain resources, so that the network device can allocate frequency domain resources reasonably.

[0027] In one possible design, second information is received, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource. In this way, a network device can allocate the first frequency domain resource and / or the second frequency domain resource, so that a terminal device can determine a plurality of subbands.

[0028] In one possible design, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0029] In a fourth aspect, the present application provides a communication method, which can be applied to a communication device. The communication device can be a network device or a component (e.g., a processor, a chip, a chip system, a circuit, or a functional module) in the network device. The method can include: sending first information, the first information being used to indicate that a CSI sending manner is a wideband CSI reporting manner; and receiving two CSIs, wherein one of the two CSIs is determined according to a first frequency domain resource, and the other of the two CSIs is determined according to a second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

[0030] Based on the above method, in the wideband CSI reporting manner, different frequency domain resources can correspond to different CSIs respectively, so that the reported CSI is more accurate, and the network device can distinguish the CSI on different frequency domain resources, so that the network device can reasonably allocate the frequency domain resources.

[0031] In a possible design, second information is sent, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource. In this way, the network device can allocate the first frequency domain resource and / or the second frequency domain resource, so that the terminal device determines a plurality of subbands.

[0032] In a possible design, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0033] In a fifth aspect, the present application also provides a communication device. The communication device can be a terminal device or a component (e.g., a processor, a chip, a chip system, a circuit, or a functional module) in the terminal device. The communication device has a function of implementing the method in the first aspect or each possible design example of the first aspect, or the method in the third aspect or each possible design example of the third aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0034] In a possible design, the structure of the communication device can include a processing unit and optionally a transceiving unit. These units can perform the functions of the method in the first aspect or each possible design example of the first aspect, or the method in the third aspect or each possible design example of the third aspect, which will not be repeated here.

[0035] In one possible design, the communication apparatus can include one or more processors, and optionally, a memory and / or a transceiver, where the transceiver can be used to receive and / or transmit data, messages, or information, and to communicate with other devices in the system. The one or more processors can be configured to support the communication apparatus to perform the corresponding functionalities described above for the first aspect or any of its possible designs, or the third aspect or any of its possible designs. The memory can be coupled to the processor(s) and can store program instructions and data for the communication apparatus.

[0036] In one possible design, the communication apparatus can include one or more processors, and optionally, a memory and / or a transceiver, where the transceiver can be used to receive and / or transmit data, messages, or information, and to communicate with other devices in the system. The one or more processors can be configured to support the communication apparatus to perform the corresponding functionalities described above for the first aspect or any of its possible designs, or the third aspect or any of its possible designs. The memory can be coupled to the processor(s) and can store program instructions and data for the communication apparatus.

[0037] In one possible design, the communication apparatus can include one or more processors, and optionally, a memory and / or a transceiver, where the transceiver can be used to receive and / or transmit data, messages, or information, and to communicate with other devices in the system. The one or more processors can be configured to support the communication apparatus to perform the corresponding functionalities described above for the first aspect or any of its possible designs, or the third aspect or any of its possible designs. The memory can be coupled to the processor(s) and can store program instructions and data for the communication apparatus.

[0038] In one possible design, the communication apparatus can include one or more processors, and optionally, a memory and / or a transceiver, where the transceiver can be used to receive and / or transmit data, messages, or information, and to communicate with other devices in the system. The one or more processors can be configured to support the communication apparatus to perform the corresponding functionalities described above for the first aspect or any of its possible designs, or the third aspect or any of its possible designs. The memory can be coupled to the processor(s) and can store program instructions and data for the communication apparatus.

[0039] In one possible design, the communication apparatus can include one or more processors, and optionally, a memory and / or a transceiver, where the transceiver can be used to receive and / or transmit data, messages, or information, and to communicate with other devices in the system. The one or more processors can be configured to support the communication apparatus to perform the corresponding functionalities described above for the first aspect or any of its possible designs, or the third aspect or any of its possible designs. The memory can be coupled to the processor(s) and can store program instructions and data for the communication apparatus.

[0040] In an eighth aspect, a computer-readable storage medium is provided, which stores program instructions. When the program instructions are run on a computer, the computer is caused to perform the method described in the first aspect and any possible implementation thereof, or the second aspect and any possible implementation thereof, or the third aspect and any possible implementation thereof, or the fourth aspect and any possible implementation thereof. Illustratively, the computer-readable storage medium can be any available media that can be accessed by the computer. By way of example, and not limitation, such computer-readable storage media can comprise non-transitory computer-readable media, random-access memories (RAM), read-only memories (ROM), electrically EPROM (EEPROM), CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by the computer.

[0041] In a ninth aspect, a computer program product is provided, which includes a computer program or instructions. When the computer program or instructions are run on a computer, the method described in the first aspect or any possible implementation thereof, or the second aspect or any possible implementation thereof, or the third aspect or any possible implementation thereof, or the fourth aspect or any possible implementation thereof is executed.

[0042] In a tenth aspect, a chip or chip system is provided, which includes one or more processors coupled with at least one memory for reading and executing program instructions stored in the memory, so that the chip or chip system implements the method described in the first aspect or any possible implementation thereof, or the second aspect or any possible implementation thereof, or the third aspect or any possible implementation thereof, or the fourth aspect or any possible implementation thereof.

[0043] The technical effects of each of the fifth aspect to the tenth aspect and each possible implementation thereof can be referred to the technical effects of the first aspect or any possible implementation thereof, or the second aspect or any possible implementation thereof, or the third aspect or any possible implementation thereof, or the fourth aspect or any possible implementation thereof, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1A schematic diagram of an architecture of a communication system is provided for the present application;

[0045] Figure 2 A schematic diagram of an uplink and downlink slot configuration of TDD is provided for the present application;

[0046] Figure 3 A schematic diagram of an uplink and downlink slot configuration of SBFD is provided for the present application;

[0047] Figure 4 A schematic diagram of sub-band non-overlapping full duplex is provided for the present application;

[0048] Figure 5 A schematic diagram of sub-band overlapping full duplex is provided for the present application;

[0049] Figure 6 A schematic diagram of IBFD is provided for the present application;

[0050] Figure 7 A schematic diagram of a flow of a communication method is provided for the present application;

[0051] Figure 8 A schematic diagram of a CSI reporting sub-band (csi-ReportingBand) is provided for the present application;

[0052] Figure 9 A schematic diagram of sub-band determination is provided for the present application;

[0053] Figure 10 A schematic diagram of another sub-band determination is provided for the present application;

[0054] Figure 11 A schematic diagram of splitting of sub-band is provided for the present application;

[0055] Figure 12 A schematic diagram of transmitting CSI is provided for the present application;

[0056] Figure 13 A schematic diagram of another flow of a communication method is provided for the present application;

[0057] Figure 14 A schematic diagram of another transmitting CSI is provided for the present application;

[0058] Figure 15 A schematic diagram of a structure of a communication apparatus is provided for the present application;

[0059] Figure 16 A schematic diagram of a structure of a communication apparatus is provided for the present application. DETAILED DESCRIPTION

[0060] The embodiment of the present application provides a communication method and device, so that the network equipment distinguishes the CSI on different frequency domain resources, thereby reasonably allocating the frequency domain resources. The method and device of the present application are based on the same technical concept. Since the principles of the method and device for solving problems are similar, the implementation of the device and the method can be mutually referred to, and the repeated parts will not be described again.

[0061] In the description of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor indicating or implying order.

[0062] In the description of the present application, "at least one" means one or more, and more means two or more. "At least one of the following" or the like means any combination of the items, including any combination of single or multiple items. For example, at least one of a, b or c can represent a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0063] In the description of the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, B exists alone, wherein A, B can be singular or plural. " / " represents "or", for example, a / b represents a or b.

[0064] In order to more clearly describe the technical scheme of the embodiment of the present application, the communication method and device provided by the embodiment of the present application will be described in detail below in combination with the drawings.

[0065] The technical scheme in the embodiment of the present application can be applied to various communication systems, such as universal mobile communication system (UMTS), wireless local area network (WLAN), wireless fidelity (Wi-Fi) system, fourth generation (4G) mobile communication system (such as long term evolution (LTE) system), fifth generation (5G) mobile communication system (such as new radio (NR) system), and future evolved communication system (such as sixth generation (6G) mobile communication system) and the like.

[0066] Exemplary, Figure 1A schematic diagram of an architecture of a possible communication system to which embodiments of the application are applicable is shown. As illustrated, the communication system 10 can include a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 can also include the Internet 300. Figure 1 As illustrated, the communication system 10 can include a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 can also include the Internet 300.

[0067] The RAN 100 includes at least one RAN node (e.g., 110a and 110b in Figure 1 , collectively referred to as 110) and at least one terminal device (e.g., 120a-120j in Figure 1 , collectively referred to as 120). Other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1 , etc., can also be included in the RAN 100. The terminal devices 120 are connected to the RAN nodes 110 wirelessly. The RAN nodes 110 are connected to the core network 200 wirelessly or wired. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be different physical devices, or can be the same physical device that integrates the core network logical functions and the radio access network logical functions.

[0068] The RAN 100 can be a 3rd generation partnership project (3GPP) related cellular system, e.g., a 4G, 5G mobile communication system, or a future-oriented evolved system (e.g., a 6G mobile communication system). The RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), or a WiFi system. The RAN 100 can also be a communication system that integrates two or more of the above systems.

[0069] The RAN nodes 110, which can also be referred to as RAN entities or access nodes, etc., form part of the communication system to help terminal devices to access wirelessly. The RAN nodes 110 in the communication system 10 can be of the same type or of different types. In some scenarios, the roles of the RAN nodes 110 and the terminal devices 120 are relative, e.g., Figure 1 In some scenarios, the network element 120i can be a helicopter or a drone, which can be configured to be a mobile base station. For those terminal devices 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal device. Both the RAN nodes 110 and the terminal devices 120 are sometimes referred to as communication apparatuses, e.g.,Figure 1 Network elements 110a and 110b can be understood as communication devices with base station functions, while network elements 120a-120j can be understood as communication devices with terminal equipment functions.

[0070] RAN nodes can also be described in different ways, such as network devices. Unless otherwise specified in this application, network devices will be used as the term.

[0071] In one possible scenario, network equipment can also be called access network equipment. Access network equipment can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a next-generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc. Access network equipment can also be a macro base station (such as...). Figure 1 110a), micro base stations or indoor stations (such as Figure 1 The access network device can be a relay node or donor node (as described in 110b), or a wireless controller in a CRAN scenario. Optionally, the access network device can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the access network device in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). All or part of the functions of the access network device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (e.g., a cloud platform). The access network device in this application can also be a logical node, logical module, or software capable of implementing all or part of the access network device functions.

[0072] In another possible scenario, a terminal device accesses a network device through multiple access network devices. The multiple access network devices can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately configured, or can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0073] In different systems, the CU (or CU-CP and CU-UP), DU, or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an open CU (O-CU), the DU can also be referred to as an open DU (O-DU), the CU-CP can also be referred to as an open CU-CP (O-CU-CP), the CU-UP can also be referred to as an open CU-UP (O-CU-UP), and the RU can also be referred to as an open RU (O-RU). Any of the CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0074] The terminal device can also be referred to as user equipment (UE), mobile station, mobile terminal, etc. The terminal device can be widely applied to various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal device can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, etc. Embodiments of the present application do not limit the device form of the terminal device.

[0075] In some scenarios, the network device can send a downlink signal to the terminal device, and the terminal device can send an uplink signal to the network device. In addition, the network devices can also communicate with each other, and the terminal devices can also communicate with each other.

[0076] The communication system described in the embodiments of the present application is used to more clearly illustrate the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems as the network architecture evolves and new business scenarios appear.

[0077] The related terms or technologies involved in the embodiments of the present application will be explained first. It should be noted that these explanations are to make the embodiments of the present application easier to understand, and should not be regarded as a limitation on the scope of protection required by the present application.

[0078] 1) Cross link interference (CLI): interference between communication links in opposite directions, such as uplink-to-downlink interference or downlink-to-uplink interference.

[0079] 2) Time division duplexing (TDD)

[0080] TDD divides the time domain resource into uplink and downlink, for example, a possible TDD uplink and downlink slot configuration is DDDSU, as shown in the following table: Figure 2As shown in the diagram. D represents the downlink time slot, where each symbol in the downlink time slot is a downlink symbol; U represents the uplink time slot, where each symbol in the uplink time slot is an uplink symbol; and S represents the special time slot, which includes at least one flexible symbol that can be used for uplink transmission, downlink transmission, or guard intervals.

[0081] In TDD, downlink time slots occupy the majority of time domain resources, thus limiting the allocation of uplink time domain resources, resulting in reduced uplink coverage and greater latency in TDD.

[0082] 3) Subband full duplex (SBFD)

[0083] To address the issues of uplink coverage and latency in TDD systems, an enhancement scheme, SBFD, is proposed.

[0084] SBFD divides the frequency band on a downlink symbol (and / or flexible symbol) into at least one uplink sub-band, and allows uplink signals to be transmitted on the uplink sub-band of the downlink symbol (and / or flexible symbol), such as... Figure 3 As shown. Frequency domain resources outside the uplink subband can still be used for downlink transmission, referred to as the downlink subband. Compared to TDD, SBFD has more uplink resources to improve uplink coverage performance, and each timeslot has uplink resources for hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback to reduce latency.

[0085] SBFD includes two modes: subband overlapping full duplex and subband non-overlapping full duplex. Subband non-overlapping full duplex requires that the subband configuration be identical across the entire network, such as... Figure 4 As shown; however, for subband overlapping full-duplex, the subband configuration of the entire network can be different, such as... Figure 5 As shown.

[0086] 4) In-band full duplex (IBFD)

[0087] To address the issues of uplink coverage and latency in TDD systems, an alternative enhancement scheme, IBFD, is proposed.

[0088] IBFD can perform uplink and downlink transmissions simultaneously on the same time-frequency resources, such as Figure 6 As shown. Compared to TDD and SBFD, IBDD has more uplink and downlink resources, which improves uplink and downlink performance and can also effectively reduce latency.

[0089] 5) Flexible frequency domain resource and downlink frequency domain resource

[0090] In the sub-band overlapping full duplex mode of SBFD, the flexible frequency domain resource can be used for downlink transmission of the first network device, and used for uplink transmission of the second network device, for example Figure 5 The flexible frequency domain resource shown in FIG. 5. In the sub-band overlapping full duplex mode of SBFD, the flexible frequency domain resource can also be referred to as an overlapping frequency domain resource, or can also have other descriptions, which are not limited by the present application.

[0091] In IBFD, the flexible frequency domain resource can be used for uplink transmission between the first network device and the first terminal device, and at the same time can be used for downlink transmission between the first network device and the second terminal device, for example Figure 6 The flexible frequency domain resource shown in FIG. 6. In IBFD, the flexible frequency domain resource can also be referred to as a full duplex frequency domain resource, or can also have other descriptions, which are not limited by the present application.

[0092] It should be understood that the first network device, the second network device, the first terminal device and the second terminal device are only examples and do not limit the present application.

[0093] The flexible frequency domain resource can also be understood as a frequency domain resource that exists gNB-gNB intra-subband CLI and gNB-gNB inter-subband CLI.

[0094] The downlink frequency domain resource can be used for downlink transmission of any network device. For example Figure 5 And Figure 6 The downlink frequency domain resource shown in FIG. 7.

[0095] The downlink frequency domain resource can also be understood as a frequency domain resource that exists gNB-gNB inter-subband CLI, but does not exist gNB-gNB intra-subband CLI.

[0096] The communication method provided by the embodiments of the present application is described in detail below. In the following embodiments, the communication method provided by the present application is described in detail by taking the terminal device and the network device as an example. It should be understood that the operations performed by the terminal device can also be realized by the processor in the terminal device, or a chip or chip system, or a functional module, etc. The operations performed by the network device can also be realized by the processor in the network device, or a chip or chip system, or a functional module, etc. The present application does not limit this.

[0097] Based on the above description, the communication method provided by the embodiments of the present application can be referred to Figure 7 The flow of the method can include:

[0098] Step 701: The network device sends first information. Correspondingly, the terminal device receives the first information. The first information is used to indicate that the CSI sending manner is a sub-band CSI reporting manner.

[0099] Step 702: The terminal device sends at least two CSIs. Correspondingly, the network device receives the at least two CSIs. The at least two CSIs are determined according to at least two sub-bands, the at least two CSIs correspond to the at least two sub-bands in a one-to-one manner, and the at least two sub-bands are determined according to a first frequency domain resource and a second frequency domain resource. The first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

[0100] Optionally, the first information can be frequency domain reporting configuration (reportFreqConfiguration), or the first information can be carried in the reportFreqConfiguration.

[0101] In some embodiments, the CSI can include a precoding matrix indication (PMI) and / or a channel quality indicator (CQI).

[0102] Correspondingly, the first information is used to indicate that the CSI sending manner is a sub-band CSI reporting manner, which can be understood as that the first information is used to indicate that the CQI sending manner is a sub-band CQI reporting manner and / or the PMI sending manner is a sub-band PMI reporting manner.

[0103] Optionally, the first information can include first sub-information and / or second sub-information. The first sub-information is used to indicate that the CQI sending manner is a sub-band CQI reporting manner, and the second sub-information is used to indicate that the PMI sending manner is a sub-band PMI reporting manner.

[0104] In an example, the first sub-information can be CQI format indication (cqi-FormatIndicator), or the first information can be carried in the cqi-FormatIndicator.

[0105] The second sub-information can be PMI format indication (pmi-FormatIndicator), or the first information can be carried in the pmi-FormatIndicator.

[0106] In an optional implementation, the first information can also be used to indicate a set of sub-bands, and the at least two sub-bands are included in the set of sub-bands.

[0107] Optionally, the first information can further include third sub-information, the third sub-information being used to indicate the set of sub-bands.

[0108] For example, the third sub-information can be csi-ReportingBand, or the third sub-information can also be carried in csi-ReportingBand. For example, csi-ReportingBand can be as shown in Figure 8 .

[0109] In some embodiments, the first information can further be used to indicate the number of sub-bands, and the number of sub-bands can be greater than 19.

[0110] Optionally, the number of sub-bands can be indicated by the third sub-information, for example, the number of sub-bands can be 20, 21 or 22, as shown in Figure 8 .

[0111] In some embodiments, the network device can further transmit second information before transmitting the first information. Correspondingly, the terminal device can further receive the second information before receiving the first information. The second information can be used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0112] In one example, the first frequency domain resource can be used for downlink transmission of the network device, and the second frequency domain resource can be used for downlink transmission of the network device. For other network devices, the first frequency domain resource can be used for uplink transmission of other network devices, and the second frequency domain resource can be used for downlink transmission of other network devices. For example, the first frequency domain resource can be a flexible frequency domain resource as shown in Figure 5 , and the second frequency domain resource can be a downlink frequency domain resource as shown in Figure 5 .

[0113] In another example, the first frequency domain resource can be used for downlink transmission between the network device and the terminal device, and can also be used for uplink transmission between the network device and other terminal devices, and the second frequency domain resource can be used for downlink transmission of any network device. For example, the first frequency domain resource can be a flexible frequency domain resource as shown in Figure 6 , and the second frequency domain resource can be a downlink frequency domain resource as shown in Figure 6 .

[0114] That is, on the first frequency domain resource, the transmission directions of different network devices can be different, and on the second frequency domain resource, the transmission directions of different network devices are the same and are downlink transmission.

[0115] In some embodiments, the first frequency domain resource can be one continuous frequency domain resource in the frequency domain, or the first frequency domain resource can also include at least one non-continuous frequency domain resource in the frequency domain.

[0116] The second frequency domain resource can be one frequency domain resource continuous in the frequency domain, or the second frequency domain resource can also include at least one frequency domain resource discontinuous in the frequency domain.

[0117] It should be understood that when the first frequency domain resource and / or the second frequency domain resource contains at least one discontinuous resource, the second information used to indicate the first frequency domain resource can indicate at least one discontinuous resource corresponding to the first frequency domain resource, and / or the second information used to indicate the second frequency domain resource can indicate at least one discontinuous resource corresponding to the second frequency domain resource.

[0118] In a possible way, if the second information indicates the first frequency domain resource or the second frequency domain resource, the terminal device can determine the other frequency domain resource through the total number of configured resources and resource positions.

[0119] In an optional implementation, before the terminal device transmits the at least two CSIs, the terminal device can also determine a plurality of subbands according to the first frequency domain resource and the second frequency domain resource, the plurality of subbands including at least two subbands, and the plurality of subbands satisfying one or more of the following conditions:

[0120] Each subband is continuous in the frequency domain;

[0121] Each two subbands do not overlap in the frequency domain;

[0122] Each subband only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource;

[0123] The union of the plurality of subbands in the frequency domain is equal to the BWP;

[0124] Each subband includes a maximum of N frequency domain units, N being a positive integer; or

[0125] The adjacent two subbands including less than N frequency domain units do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time.

[0126] By satisfying the above conditions by the subbands, the CSI reported for the subbands can be reported on the explicit resource, so that the reported CSI is more accurate.

[0127] In an exemplary method, the terminal device determines a plurality of subbands according to the first frequency domain resource and the second frequency domain resource, which can be implemented by the following method: the terminal device can determine a plurality of frequency unit groups, one frequency unit group including N frequency units, the plurality of frequency unit groups being continuous in the frequency domain, N being a positive integer; then, the terminal device determines the frequency units overlapping with the first frequency domain resource in each frequency unit group as at least one subband, and / or determines the frequency units overlapping with the second frequency domain resource in each frequency unit group as at least one subband, to obtain the plurality of subbands.

[0128] Specifically, the terminal device can implement by the following steps:

[0129] A1, the terminal device can define N consecutive frequency units to form a frequency unit group, the starting frequency unit of the first frequency unit group is the reference frequency unit, and the starting frequency unit of each frequency unit group other than the first frequency unit group is the next frequency unit of the last frequency unit of the previous frequency unit group.

[0130] A2, the terminal device determines that each group of consecutive frequency units forms a sub-band in at least one frequency unit of a frequency unit group overlapping with the first frequency domain resource; similarly, in at least one frequency unit of a frequency unit group overlapping with the second frequency domain resource, each group of consecutive frequency units forms a sub-band.

[0131] A3, the terminal device arranges the indexes of the sub-bands in the order from low to high frequency, and obtains a plurality of sub-bands.

[0132] For example, Figure 9 As shown in the figure, N=8 consecutive frequency units form a frequency unit group, Figure 9 Take an example of the terminal device determining 4 frequency unit groups. In the direction from low to high frequency, 5 consecutive frequency units in the first frequency unit group overlapping with the second frequency domain resource are determined as sub-band 0, 8 consecutive frequency units in the second frequency unit group overlapping with the second frequency domain resource are determined as sub-band 1, 3 consecutive frequency units in the third frequency unit group overlapping with the second frequency domain resource are determined as sub-band 2, 5 consecutive frequency units in the third frequency unit group overlapping with the first frequency domain resource are determined as sub-band 3, and 3 consecutive frequency units in the fourth frequency unit group overlapping with the first frequency domain resource are determined as sub-band 4, thereby obtaining 5 sub-bands.

[0133] It should be understood that Figure 9 This is only an example and does not limit the present application.

[0134] Figure 9 Only the first frequency domain resource and the second frequency domain resource are taken as an example of a continuous frequency domain resource. Optionally, when the first frequency domain resource includes at least one non-continuous frequency domain resource and / or the second frequency domain resource includes at least one non-continuous frequency domain resource, more sub-bands than Figure 9 The sub-bands shown can obtain more sub-bands, which will not be described in detail here.

[0135] Optionally, the reference frequency unit can be a common resource block 0 (CRB0). It should be understood that the indexes of the BWP, the first frequency domain resource and the second frequency domain resource in the description of the present application are all determined based on CRB0.

[0136] In another exemplary method, the terminal device determines the plurality of subbands according to the first frequency domain resource and the second frequency domain resource, which can be implemented by the following method: the terminal device can perform the following operations for the first frequency domain resource and the second frequency domain resource respectively to obtain the plurality of subbands:

[0137] The terminal device can determine the size of the first subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and N; N is a positive integer; the terminal device can determine the size of other subbands except the first subband and the last subband as N; the terminal device can determine the size of the last subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and the size of the first subband and the size of other subbands; wherein the target frequency domain resource is the first frequency domain resource or the second frequency domain resource.

[0138] Specifically, the terminal device can implement by the following steps:

[0139] For the ith frequency domain resource (i.e. the target frequency domain resource), wherein i = 1 or 2, i = 1 represents for the first frequency domain resource, i = 2 represents for the second frequency domain resource:

[0140] The terminal device determines the size of the first subband as Wherein, indicates the index of the starting frequency unit of the ith frequency domain resource;

[0141] If The terminal device determines the size of the last subband as Otherwise, the size of the last subband is N; wherein, indicates the number of frequency units included in the ith frequency domain resource;

[0142] The terminal device determines the size of other subbands except the first subband and the last subband as N;

[0143] The terminal device arranges the indexes of the subbands in the order of frequency from low to high to obtain the plurality of subbands.

[0144] Wherein, the size of the subband can be understood as the number of frequency units included in the subband.

[0145] For example, as shown in Figure 10 , assuming N = 8, the index of the starting frequency unit of the second frequency domain resource is 3, the number of frequency units included in the second frequency domain resource is 16, for the second frequency domain resource, the size of the first subband is ​Therefore, the size of the last sub-band in the second frequency domain resource is 3, and the size of all other sub-bands in the second frequency domain resource except for the first and last sub-bands is 8. Thus, the sub-bands in the second frequency domain resource are... Figure 10 Subband 0, subband 1, and subband 2 in the example. Similarly, as... Figure 10 As shown, the index of the starting frequency unit of the first frequency domain resource. The first frequency domain resource contains 8 frequency units, and the size of the first sub-band for the first frequency domain resource is 3. The size of the last subband in the first frequency domain resource is 3. Therefore, the subband in the first frequency domain resource is... Figure 10 Subbands 3 and 4 in the middle.

[0146] The sub-bands determined by the above method can also be understood as follows: if one of the currently determined sub-bands overlaps with both the first and second frequency domain resources, then that sub-band can be split into at least two sub-bands, and the resulting sub-bands satisfy one or more of the conditions described above. For example, Figure 11 As shown, if the subbands determined by the current method can include subbands 0 to 3, then... Figure 11 It is evident that subband 2 overlaps with both the first and second frequency domain resources. Therefore, subband 2 can be split into subband 2 and subband 3, resulting in subband 0-subband 4 that meet the requirements of this application.

[0147] Optional, Figure 11 The sub-band 2 obtained by the new split shown may not be a whole, or it may include multiple sub-bands. Similarly, sub-band 3 may not be a whole, or it may include multiple sub-bands. That is, more than 5 sub-bands can be obtained. This application does not limit this.

[0148] In some embodiments, before receiving at least two CSIs, the network device may also determine multiple sub-bands based on a first frequency domain resource and a second frequency domain resource. The conditions for the multiple sub-bands to be satisfied are as described above and will not be repeated here.

[0149] The method for determining multiple subbands by network devices is similar to that for determining multiple subbands by terminal devices, and they can be referred to each other, so it will not be repeated here.

[0150] In one alternative implementation, the network device sends a first signal before receiving at least two CSIs, and accordingly, the terminal device receives the first signal and then sends at least two CSIs based on the first signal.

[0151] For example, the first signal can be a channel state information reference signal (CSI-RS).

[0152] In some embodiments, assuming that there are M CSIs, the M CSIs are determined based on M subbands, for example, CSI#0~CSI#M-1 are determined based on subband 0~subband M-1 respectively. It can also be understood that CSI#0~CSI#M-1 correspond to subband 0~subband M-1 respectively, or it can be understood that CSI#0~CSI#M-1 are CSIs on subband 0~subband M-1 respectively. For example Figure 12 As shown, assuming that 5 CSIs are determined based on 5 subbands respectively, Figure 12 A schematic diagram of sending CSI is shown in the case that CSI includes CQI and PMI.

[0153] Based on the above communication method, in the subband CSI reporting mode, at least two CSIs are determined based on the first frequency domain resource and the second frequency domain resource, so that the CSI reported in the subband mode can be reported on the explicit resource, the reported CSI is more accurate, and the network device can distinguish the CSI on different frequency domain resources, so that the network device can reasonably allocate the frequency domain resource.

[0154] Another communication method is provided in the embodiments of the present application, which can be referred to Figure 13 As shown. The flow of the method can include:

[0155] Step 1301: The network device sends first information. Correspondingly, the terminal device receives the first information. The first information is used to indicate that the CSI sending mode is a wideband CSI reporting mode.

[0156] Step 1302: The terminal device sends two CSIs. Correspondingly, the network device receives the two CSIs. One of the two CSIs is determined according to the first frequency domain resource, and the other CSI is determined according to the second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

[0157] Optionally, the first information can be a frequency domain reporting configuration (reportFreqConfiguration), or the first information can be carried in the reportFreqConfiguration.

[0158] In some embodiments, the CSI can include a precoding matrix indication (PMI) and / or a channel quality indicator (CQI).

[0159] Correspondingly, the first information is used to indicate that the manner of sending CSI is a bandwidth CSI reporting manner, which can be understood as that the first information is used to indicate that the manner of sending CQI is a bandwidth CQI reporting manner and / or the manner of sending PMI is a bandwidth PMI reporting manner.

[0160] Optionally, the first information can include first sub-information and / or second sub-information, the first sub-information is used to indicate that the manner of sending CQI is a bandwidth CQI reporting manner, and the second sub-information is used to indicate that the manner of sending PMI is a bandwidth PMI reporting manner.

[0161] In an example, the first sub-information can be CQI format indication (cqi-FormatIndicator), or the first information can be carried in the cqi-FormatIndicator.

[0162] The second sub-information can be PMI format indication (pmi-FormatIndicator), or the first information can be carried in the pmi-FormatIndicator.

[0163] In some embodiments, the network device can further send second information before sending the first information. Correspondingly, the terminal device can further receive the second information before receiving the first information. The second information can be used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0164] The first frequency domain resource and the second frequency domain resource can refer to the related descriptions described above, and will not be described here.

[0165] In an optional implementation, the network device sends a first signal before receiving the two CSIs, and correspondingly, the terminal device receives the first signal and then sends the two CSIs according to the first signal.

[0166] Exemplarily, the first signal can be a CSI-RS.

[0167] In some embodiments, assuming that the two CSIs are CSI#0 and CSI#1, the CSI#0 can be determined based on the second frequency domain resource, and the CSI#1 can be determined based on the first frequency domain resource. It can also be understood that the CSI#0 corresponds to the second frequency domain resource, and the CSI#1 corresponds to the first frequency domain resource, or it can also be understood that the CSI#0 is the CSI on the second frequency domain resource, and the CSI#1 is the CSI on the first frequency domain resource. For example Figure 14 The figure shows a schematic diagram of sending two CSIs, taking the CSI including CQI and PMI as an example.

[0168] Based on the above method, in the wideband CSI reporting mode, different frequency domain resources can correspond to different CSIs respectively, so that the reported CSI is more accurate, and the network device can distinguish the CSI on different frequency domain resources, so as to reasonably allocate the frequency domain resources.

[0169] Based on the above embodiments, the embodiments of the present application also provide a communication device, as shown in Figure 15 The transceiver unit 1501 is configured to perform communication of the communication device 1500, such as receiving information (message or data) or sending information (message or data), and the processing unit 1502 is configured to control and manage the actions of the communication device 1500. The processing unit 1502 can also control the steps performed by the transceiver unit 1501.

[0170] For example, the communication device 1500 can be a terminal device, a processor of the terminal device, a chip, a chip system, or a functional module in the above embodiments. Alternatively, the communication device 1500 can be a network device, a processor of the network device, a chip, a chip system, or a functional module in the above embodiments.

[0171] In one embodiment, the communication device 1500 is configured to implement the functions of the terminal device in the above embodiments. Figure 7 When the communication device 1500 is configured to implement the functions of the terminal device in the above embodiments, the transceiver unit 1501 can be configured to receive first information, the first information being used to indicate that a sending channel state information (CSI) mode is a sub-band CSI reporting mode, and send at least two CSIs, wherein the at least two CSIs are determined according to at least two sub-bands, the at least two CSIs correspond to the at least two sub-bands one by one, and the at least two sub-bands are determined according to a first frequency domain resource and a second frequency domain resource. The first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource. The processing unit 1502 can be configured to control the transceiving operation of the transceiver unit 1501.

[0172] In some embodiments, the processing unit 1502 can also be configured to determine a plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource, the plurality of sub-bands including the at least two sub-bands, and the plurality of sub-bands satisfying one or more of the following conditions:

[0173] Each sub-band is continuous in the frequency domain;

[0174] Each two sub-bands do not overlap in the frequency domain;

[0175] Each sub-band only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource;

[0176] a union of the plurality of subbands in the frequency domain equals a bandwidth part (BWP);

[0177] each of the plurality of subbands includes a number of frequency domain units that is at most N, where N is a positive integer; or

[0178] two adjacent subbands that include a number of frequency domain units that is less than N do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time.

[0179] In an example, the processing unit 1502, when determining the plurality of subbands according to the first frequency domain resource and the second frequency domain resource, can be configured to: determine a plurality of groups of frequency units, each of the groups of frequency units including N frequency units, where N is a positive integer, and the plurality of groups of frequency units being consecutive in the frequency domain; determine that at least one subband is formed by frequency units in each of the groups of frequency units that overlap with the first frequency domain resource and / or at least one subband is formed by frequency units in each of the groups of frequency units that overlap with the second frequency domain resource, to obtain the plurality of subbands.

[0180] In another example, the processing unit 1502, when determining the plurality of subbands according to the first frequency domain resource and the second frequency domain resource, can be configured to: for the first frequency domain resource and the second frequency domain resource, respectively, perform the following operations to obtain the plurality of subbands: determine a size of a first subband according to an index of a starting frequency unit of a target frequency domain resource, a number of frequency units included in the target frequency domain resource, and N, where N is a positive integer; determine a size of each of the other subbands except the first subband and a last subband to be N; and determine a size of the last subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, the size of the first subband, and the size of the other subbands, where the target frequency domain resource is the first frequency domain resource or the second frequency domain resource.

[0181] In an example, the transceiver 1501 can further be configured to receive second information, where the second information is used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0182] In some embodiments, the first information can be further used to indicate a number of subbands, and the number of subbands is 20, 21, or 22.

[0183] In some embodiments, the first information can be further used to indicate a set of subbands, and the at least two subbands are included in the set of subbands.

[0184] In an example, the CSI can include a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0185] In another embodiment, the communication device 1500 is configured to implement the above-described Figure 7 In the embodiment shown, when the network device is used to implement the above-described functions, the transceiver unit 1501 can be configured to transmit first information, the first information being used to indicate that the manner of transmitting channel state information CSI is a sub-band CSI reporting manner; and receive at least two CSIs, the at least two CSIs being determined according to at least two sub-bands, the at least two CSIs corresponding to the at least two sub-bands in a one-to-one manner, the at least two sub-bands being determined according to the first frequency domain resource and the second frequency domain resource, the first frequency domain resource being a flexible frequency domain resource, and the second frequency domain resource being a downlink frequency domain resource. The processing unit 1502 can be configured to control the transceiving operation of the transceiver unit 1501.

[0186] In an optional implementation, the processing unit 1502 can be further configured to determine a plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource, the plurality of sub-bands including the at least two sub-bands, and the plurality of sub-bands satisfying one or more of the following conditions:

[0187] Each of the sub-bands is continuous in the frequency domain;

[0188] Each of the sub-bands is continuous in the frequency domain;

[0189] Each of the sub-bands only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource;

[0190] The union set of the plurality of sub-bands in the frequency domain is equal to a bandwidth part BWP;

[0191] Each of the sub-bands includes a maximum of N frequency domain units, the N being a positive integer; or

[0192] The adjacent two sub-bands including a number of frequency domain units less than the N do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time.

[0193] In some embodiments, when the processing unit 1502 determines the plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource, the processing unit 1502 can be configured to: determine a plurality of frequency unit groups, one of the frequency unit groups including N frequency units, the plurality of frequency unit groups being continuous in the frequency domain, the N being a positive integer; determine that the frequency units overlapping with the first frequency domain resource in each of the frequency unit groups are at least one sub-band, and / or determine that the frequency units overlapping with the second frequency domain resource in each of the frequency unit groups are at least one sub-band, to obtain the plurality of sub-bands.

[0194] In another embodiment, the processing unit 1502, when determining the plurality of subbands according to the first frequency domain resource and the second frequency domain resource, can be configured to: perform the following operations for the first frequency domain resource and the second frequency domain resource respectively to obtain the plurality of subbands:

[0195] determine the size of the first subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and N; the N is a positive integer;

[0196] determine the size of the other subbands except the first subband and the last subband as N;

[0197] determine the size of the last subband according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, the size of the first subband, and the size of the other subbands;

[0198] The target frequency domain resource is the first frequency domain resource or the second frequency domain resource.

[0199] Optionally, the transceiver 1501 can also be configured to send second information, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0200] In an example, the first information can also be used to indicate the number of subbands, and the number of subbands is 20, 21, or 22.

[0201] In another example, the first information can also be used to indicate a set of subbands, and the at least two subbands are included in the set of subbands.

[0202] Optionally, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0203] In yet another embodiment, the communication apparatus 1500 is configured to implement the above-described Figure 13 In the illustrated embodiment, when the terminal device is functional, the transceiver 1501 can be configured to receive first information, the first information being used to indicate that the manner of sending channel state information (CSI) is a wideband CSI reporting manner; and send two CSIs; one of the two CSIs is determined according to a first frequency domain resource, and the other is determined according to a second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource. The processing unit 1502 can be configured to control the transceiving operation of the transceiver 1501.

[0204] In an alternative implementation, the transceiver 1501 can further be configured to receive second information, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0205] For example, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0206] In yet another embodiment, the communication apparatus 1500 is configured to implement the above-described Figure 13 When the network device is implemented as the above-described embodiments, the transceiver 1501 can be configured to transmit first information, the first information being used to indicate that a manner of transmitting channel state information (CSI) is a wideband CSI reporting manner; and receive two CSIs, one of the two CSIs being determined according to a first frequency domain resource and the other of the two CSIs being determined according to a second frequency domain resource; the first frequency domain resource being a flexible frequency domain resource, and the second frequency domain resource being a downlink frequency domain resource. The processing unit 1502 can be configured to control the transceiving operation of the transceiver 1501.

[0207] In an alternative implementation, the transceiver 1501 can further be configured to transmit second information, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource.

[0208] For example, the CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

[0209] It should be noted that the division of units in the embodiments of the present application is illustrative, and is merely a logical function division. In actual implementation, another division manner can be used. The functional units in the embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0210] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0211] Based on the above embodiments, the embodiments of the present application also provide a communication device, as shown in Figure 16 The communication device 1600 can include one or more processors 1602. Optionally, the communication device 1600 can also include a transceiver 1601. Optionally, the communication device 1600 can also include at least one memory 1603. The memory 1603 can be arranged inside the communication device 1600 or outside the communication device 1600. The processor 1602 can control the transceiver 1601 to receive and send information, messages or data, etc.

[0212] Specifically, the processor 1602 can be a central processing unit (CPU), a network processor (NP) or a combination of CPU and NP. The processor 1602 can further include a hardware chip. The hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0213] The transceiver 1601, processor 1602, and memory 1603 are interconnected. Optionally, the transceiver 1601, processor 1602, and memory 1603 are interconnected via a bus 1604; the bus 1604 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 16 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0214] In one optional embodiment, the memory 1603 is used to store programs, etc. Specifically, the program may include program code, which includes computer operation instructions. The memory 1603 may include RAM, and may also include non-volatile memory, such as one or more disk storage devices. The processor 1602 executes the application program stored in the memory 1603 to achieve the above-mentioned functions, thereby realizing the functions of the communication device 1600.

[0215] For example, the communication device 1600 can specifically implement the functions of the network device or terminal device in the above embodiments.

[0216] In one embodiment, the communication device 1600 performs the aforementioned Figure 7 In the method embodiment shown, when the terminal device functions as described above, the transceiver 1601 can implement the aforementioned... Figure 7 The transmit and receive operations performed by the terminal device in the method embodiment shown; the processor 1602 can implement the aforementioned Figure 7 The method embodiment shown includes operations performed by the terminal device other than sending and receiving operations. For a detailed description, please refer to the above. Figure 7 The relevant descriptions in the method embodiments shown will not be detailed here.

[0217] In another embodiment, the communication device 1600 implements the aforementioned Figure 7 When the network device functions as described in the method embodiment, the transceiver 1601 can implement the aforementioned... Figure 7 The transmit and receive operations performed by the network device in the method embodiment shown; the processor 1602 can implement the aforementioned Figure 7 The method embodiment shown refers to operations performed by the network device other than sending and receiving operations. For a detailed description, please refer to the above. Figure 7The related description in the method embodiments shown will not be described in detail here.

[0218] In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here. Figure 13 Figure 13 In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here. Figure 13 Figure 13 In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here.

[0219] In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here. Figure 13 Figure 13 In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here. Figure 13 Figure 13 In yet another embodiment, the communication apparatus 1600, in implementing the functionality of the network device in the foregoing method embodiments, the transceiver 1601 can implement the transceiving operations performed by the network device in the foregoing method embodiments; the processor 1602 can implement the operations other than the transceiving operations performed by the network device in the foregoing method embodiments. The specific related description can be referred to the foregoing related description in the method embodiments shown, and will not be described in detail here.

[0220] Based on the foregoing embodiments, the embodiments of the present application provide a communication system, which can include the network device and the terminal device and the like involved in the foregoing embodiments.

[0221] The embodiments of the present application further provide a computer readable storage medium for storing a computer program or instructions, which, when executed by a computer, can implement the communication method provided by the foregoing method embodiments.

[0222] The embodiments of the present application further provide a computer program product for storing a computer program or instructions, which, when executed by a computer, can implement the communication method provided by the foregoing method embodiments.

[0223] The embodiments of the present application further provide a chip or chip system, which includes a logic circuit for executing the communication method provided by the foregoing method embodiments.

[0224] The embodiments of the present application further provide a chip or chip system, which includes one or more processors coupled with at least one memory for calling a program in the memory so that the chip or chip system implements the communication method provided by the foregoing method embodiments.​​​​

[0225] The embodiments of the present application also provide a chip or chip system coupled with at least one memory, and the chip or chip system is used to implement the communication method provided by the method embodiments.

[0226] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code.

[0227] The present application is described with reference to the flowcharts and / or block diagrams of the method, device (system), and computer program product according to the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the functions specified in the flowcharts and / or block diagrams.

[0228] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the functions specified in the flowcharts and / or block diagrams.

[0229] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the functions specified in the flowcharts and / or block diagrams.

[0230] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A communication method characterized by comprising: The method comprises: receiving first information, the first information being used to indicate a manner of sending channel state information (CSI) as a sub-band CSI reporting manner; sending at least two CSIs, wherein the at least two CSIs are determined according to at least two sub-bands, the at least two CSIs correspond to the at least two sub-bands one by one, and the at least two sub-bands are determined according to a first frequency domain resource and a second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

2. The method of claim 1, wherein, The method further comprises: determining a plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource, wherein the plurality of sub-bands include the at least two sub-bands, and the plurality of sub-bands satisfy one or more of the following conditions: each sub-band is continuous in the frequency domain; each two sub-bands do not overlap in the frequency domain; each sub-band only overlaps with the first frequency domain resource or only overlaps with the second frequency domain resource; a union set of the plurality of sub-bands in the frequency domain is equal to a bandwidth part (BWP); a maximum number of frequency domain units included in each sub-band is N, wherein N is a positive integer; or adjacent two sub-bands including a number of frequency domain units less than N do not overlap with the first frequency domain resource at the same time or do not overlap with the second frequency domain resource at the same time.

3. The method of claim 2, wherein, Determining the plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource comprises: determining a plurality of frequency unit groups, wherein one frequency unit group includes N frequency units, the plurality of frequency unit groups are continuous in the frequency domain, and N is a positive integer; determining that a frequency unit overlapping with the first frequency domain resource in each frequency unit group is at least one sub-band, and / or determining that a frequency unit overlapping with the second frequency domain resource in each frequency unit group is at least one sub-band, to obtain the plurality of sub-bands.

4. The method of claim 2, wherein, Determining the plurality of sub-bands according to the first frequency domain resource and the second frequency domain resource comprises: performing the following operations on the first frequency domain resource and the second frequency domain resource respectively to obtain the plurality of sub-bands: determining a size of a first sub-band according to an index of a starting frequency unit of a target frequency domain resource, a number of frequency units included in the target frequency domain resource, and N, wherein N is a positive integer; determining a size of each sub-band other than the first sub-band and a last sub-band as N; determining a size of the last sub-band according to the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, and the size of the first sub-band and the size of the other sub-band; wherein the target frequency domain resource is the first frequency domain resource or the second frequency domain resource.

5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: receiving second information, the second information being used to indicate the first frequency domain resource and / or the second frequency domain resource.

6. The method according to any one of claims 1 to 5, wherein, The first information is further used to indicate a number of sub-bands, and the number of sub-bands is 20, 21, or 22.

7. The method according to any one of claims 1 to 6, wherein The first information is further used to indicate a set of sub-bands, and the at least two sub-bands are included in the set of sub-bands.

8. The method according to any one of claims 1 to 7, wherein, The CSI includes a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

9. A communication method characterized by comprising: The method comprises: Send first information, which indicates that the method of sending Channel State Information (CSI) is subband CSI reporting. Receive at least two CSIs; wherein the at least two CSIs are determined based on at least two sub-bands, the at least two CSIs correspond one-to-one with the at least two sub-bands, and the at least two sub-bands are determined based on the first frequency domain resource and the second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

10. The method of claim 9, wherein, The method further includes: Multiple sub-bands are determined based on the first frequency domain resource and the second frequency domain resource, the multiple sub-bands including the at least two sub-bands, and the multiple sub-bands satisfy one or more of the following: Each sub-band is continuous in the frequency domain; Each two sub-bands do not overlap in the frequency domain; Each sub-band overlaps only with the first frequency domain resource, or only with the second frequency domain resource; The union of the multiple sub-bands in the frequency domain is equal to the bandwidth portion BWP; Each sub-band includes a maximum of N frequency domain units, where N is a positive integer; or Two adjacent sub-bands with a frequency domain element count less than N do not overlap with the first frequency domain resource at the same time, or do not overlap with the second frequency domain resource at the same time.

11. The method of claim 10, wherein, Determining the plurality of sub-bands based on the first frequency domain resources and the second frequency domain resources includes: Multiple frequency unit groups are defined, each frequency unit group comprising N frequency units, the multiple frequency unit groups being continuous in the frequency domain, and N being a positive integer; In each frequency unit group, a frequency unit that overlaps with the first frequency domain resource is determined to be at least one sub-band, and / or, in each frequency unit group, a frequency unit that overlaps with the second frequency domain resource is determined to be at least one sub-band, thus obtaining the plurality of sub-bands.

12. The method of claim 10, wherein, Determining the plurality of sub-bands based on the first frequency domain resources and the second frequency domain resources includes: For the first frequency domain resource and the second frequency domain resource, perform the following operations respectively to obtain the plurality of sub-bands: The size of the first sub-band is determined based on the index of the starting frequency cell of the target frequency domain resource, the number of frequency cells included in the target frequency domain resource, and N; where N is a positive integer. The size of all sub-bands other than the first and last sub-bands is determined to be N; The size of the last sub-band is determined based on the index of the starting frequency unit of the target frequency domain resource, the number of frequency units included in the target frequency domain resource, the size of the first sub-band, and the sizes of the other sub-bands; The target frequency domain resource is either the first frequency domain resource or the second frequency domain resource.

13. The method according to any one of claims 9 to 12, wherein, The method further includes: Send a second message, which is used to indicate the first frequency domain resource and / or the second frequency domain resource.

14. The method according to any one of claims 9 to 13, characterized in that, The first information is also used to indicate the number of sub-bands, which is 20, 21 or 22.

15. The method according to any one of claims 9 to 14, wherein, The first information is also used to indicate a set of subbands, wherein the at least two subbands are contained in the set of subbands.

16. The method of any one of claims 9-15, wherein, The CSI includes the Precoding Matrix Indicator (PMI) and / or the Channel Quality Indicator (CQI).

17. A method of communication, comprising: include: receiving first information, the first information being used for indicating a way of sending channel state information (CSI) is a wideband CSI reporting way; sending two CSIs, wherein one of the two CSIs is determined according to a first frequency domain resource, and another of the two CSIs is determined according to a second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

18. The method of claim 17, wherein, The method further comprises: receiving second information, the second information being used for indicating the first frequency domain resource and / or the second frequency domain resource.

19. The method of claim 17 or 18, wherein, The CSI comprises a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

20. A method of communication, comprising: comprising: sending first information, the first information being used for indicating a way of sending channel state information (CSI) is a wideband CSI reporting way; receiving two CSIs, wherein one of the two CSIs is determined according to a first frequency domain resource, and another of the two CSIs is determined according to a second frequency domain resource; the first frequency domain resource is a flexible frequency domain resource, and the second frequency domain resource is a downlink frequency domain resource.

21. The method of claim 20, wherein, The method further comprises: sending second information, the second information being used for indicating the first frequency domain resource and / or the second frequency domain resource.

22. The method of claim 20 or 21, wherein, The CSI comprises a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI).

23. A communications device, characterized by comprising units or modules for performing the method according to any one of claims 1-8, or comprising units or modules for performing the method according to any one of claims 9-16, or comprising units or modules for performing the method according to any one of claims 17-19, or comprising units or modules for performing the method according to any one of claims 20-22.

24. A communications device, characterized by comprising a processor for executing computer programs or instructions to implement the method according to any one of claims 1-8, or to implement the method according to any one of claims 9-16, or to implement the method according to any one of claims 17-19, or to implement the method according to any one of claims 20-22.

25. A computer readable storage medium, characterized in that, The computer readable storage medium stores computer programs or instructions, when the computer programs or instructions are executed by a communication device, the method according to any one of claims 1-8 is implemented, or the method according to any one of claims 9-16 is implemented, or the method according to any one of claims 17-19 is implemented, or the method according to any one of claims 20-22 is implemented.

26. A computer program product, characterised in that, The computer program product contains computer programs or instructions, when the computer programs or instructions are executed by a computer, the method according to any one of claims 1-8 is implemented, or the method according to any one of claims 9-16 is implemented, or the method according to any one of claims 17-19 is implemented, or the method according to any one of claims 20-22 is implemented.

27. A chip or chip system, characterized by The chip or chip system comprises a processor for performing the method according to any one of claims 1-8, or performing the method according to any one of claims 9-16, or performing the method according to any one of claims 17-19, or performing the method according to any one of claims 20-22.

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