CN117812736A

CN117812736A - Communication method and device

Info

Publication number: CN117812736A
Application number: CN202211217554.8A
Authority: CN
Inventors: 陆绍中; 郭志恒; 宋兴华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2024-04-02
Also published as: WO2024067539A1

Abstract

A communication method for configuring resources of channel state information. The method comprises the following steps: the terminal receives first information, wherein the first information indicates a first frequency domain resource set and a second frequency domain resource set of the channel state information reference signal, or the first information indicates the first frequency domain resource set of the channel state information reference signal, and the second frequency domain resource set is determined according to the first frequency domain resource set. And the terminal determines the frequency domain resource for receiving the channel state information reference signal according to the first frequency domain resource set and the second frequency domain resource set.

Description

Communication method and device

Technical Field

The embodiment of the application relates to the field of wireless communication, in particular to a method and a device for receiving and transmitting channel state information reference signals.

Background

Time division duplexing is widely applied to communication systems, and the time division duplexing divides time domain resources into uplink and downlink for uplink transmission and downlink transmission respectively. Under the time division duplex system, the uplink time domain resource allocation is limited, so that the uplink frequency domain resource is less, and the uplink coverage is poor. The sub-band non-overlapping full duplex improves uplink coverage by dividing the frequency domain resource on one downlink frequency domain resource into one or more downlink sub-bands and one or more uplink sub-bands, thereby increasing uplink frequency domain resources.

The terminal obtains the channel state information by receiving the channel state information reference signal, the channel state information reference signal supports broadband configuration and narrowband configuration, and the resource of the channel state information reference signal configured by the base station is a continuous resource, so that the resource of the channel state information reference signal is located in a downlink sub-band in the non-overlapping full duplex of the sub-bands, the capacity of the resource is limited, and the flexibility of the resource configuration is poor.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for improving the flexibility of channel state information reference signal resource allocation.

In a first aspect, the present application provides a communication method, which may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) of the terminal device, which is not limited. The method comprises the following steps: and receiving first information, wherein the first information indicates first frequency domain resources and second frequency domain resources of the channel state information reference signal, determining a third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set by the terminal, and receiving the channel state information reference signal on the third frequency domain resource set.

In an alternative way, the first set of frequency domain resources and the second set of frequency domain resources are two sets of frequency domain resources over a first time unit.

In an alternative manner, the first frequency domain resource set and the second frequency domain resource set are discontinuous, and the third frequency domain resource set is a union set of the first frequency domain resource set and the second frequency domain resource set. In this manner, by configuring two discontinuous frequency domain resources, the flexibility of the resource configuration of the channel state information reference signal can be improved.

In an alternative manner, the first set of frequency domain resources includes a second set of frequency domain resources, and the third set of frequency domain resources includes resources of the first set of frequency domain resources other than the second set of frequency domain resources. That is, the second set of frequency domain resources is a proper subset of the first set of frequency domain resources and the third set of frequency domain resources is a difference set of the first set of frequency domain resources and the second set of frequency domain resources.

In an alternative manner, the first set of frequency domain resources is the resources of the channel state information reference signal under the bandwidth portion BWP, and the second set of frequency domain resources is the uplink sub-band and/or guard band of the first time unit under the sub-band non-overlapping full duplex SBFD. In this way, the channel state information reference signal resource allocation flexibility can be improved by indicating the channel state information reference signal resource which cannot be used for receiving the channel state information reference signal under the SBFD, among the resources of the channel state information reference signal under the bandwidth portion BWP.

In an optional manner, among the resource blocks included in the first frequency domain resource set and the second frequency domain resource set, an index of a resource block with a minimum index is L1, an index of a resource block with a maximum index is L2, and the third frequency domain resource set includes a resource block with an index of L1, a resource block with an index of L2, and a resource block with a resource index greater than L1 and less than L2.

In an alternative manner, the third frequency domain resource set is composed of resource blocks with indexes of L1, resource blocks with indexes of L2, and resource blocks with indexes greater than L1 and less than L2.

In this manner, the network device may configure and indicate to the terminal the resources of two discontinuous channel state information reference signals, and the terminal may understand the resources of two discontinuous channel state information reference signals as a continuous resource. The resource allocation of the channel state information reference signal under the time division duplex can be adapted, and the compatibility of the resource allocation of the channel state information reference signal to different communication systems is improved.

In an alternative manner, the first indication information indicates a starting position S1 of the first frequency domain resource set and a starting position S2 of the second frequency domain resource set, and a size N1 of the first frequency domain resource set and a size N2 of the second frequency domain resource set.

In an alternative manner, S1 is an index of a first frequency domain resource set starting resource block, and S2 is an index of a second frequency domain resource set starting resource block.

In an alternative manner, N1 is the number of resource blocks included in the first frequency domain resource set, and N2 is the number of resource blocks included in the second frequency domain resource set.

In an alternative manner, the first information includes a first field and a second field, the first field indicating a first set of frequency domain resources, the second field indicating a second set of frequency domain resources.

In an alternative manner, the first set of frequency domain resources is located in a first downlink subband, and the second set of frequency domain resources is located in a second downlink subband.

In an alternative manner, the first time unit includes a first downlink subband and a second downlink subband, and the first time unit further includes a first uplink subband.

In an alternative, the first uplink sub-band is spaced between the first downlink sub-band and the second downlink sub-band.

In an alternative manner, the first frequency domain resource set is located in a first downlink subband, the second frequency domain resource set is not located or is not completely located in any downlink subband, and the third frequency domain resource set is the first frequency domain resource set.

In an alternative manner, the second frequency domain resource set is located in a second downlink subband, the first frequency domain resource set is not located or is not completely located in any downlink subband, and the third frequency domain resource set is the second frequency domain resource set.

In a second aspect, a communication method is provided, which may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) of the terminal device, which is not limited. The method comprises the following steps: and receiving first information, wherein the first information indicates first frequency domain resources of the channel state information reference signals, the terminal determines a second frequency domain resource set according to the first frequency domain resource set, and the terminal receives the channel state information reference signals on the first frequency domain resource set and the second frequency domain resource set.

In this way, the flexibility of channel state information reference by signal resource allocation is improved by pre-configuring or predefining the relationship between the first frequency domain resource set and the second frequency domain resource set.

In an alternative manner, the first frequency domain resource set and the second frequency domain resource set are discontinuous, and the third frequency domain resource set is a union set of the first frequency domain resource set and the second frequency domain resource set. In this way, the first information indicates the first frequency domain resource set, and the resources of the terminal for receiving the channel state information are increased to the first frequency domain resource set and the second frequency domain resource set, so that the resources of the terminal for receiving the channel state information reference signal are increased, and the accuracy of measurement can be improved.

In an alternative manner, the first set of frequency domain resources is the resources of the channel state information reference signal under the bandwidth portion BWP, and the second set of frequency domain resources is the uplink sub-band and/or guard band of the first time unit under the sub-band non-overlapping full duplex.

In an alternative manner, the first frequency domain resource set is located in a first downlink subband, the second frequency domain resource set is not located or is not completely located in any downlink subband, and the third frequency domain resource set is the first frequency domain resource set. In an alternative manner, the second frequency domain resource set is located in the second downlink sub-band, the first frequency domain resource set is not located or is not completely located in any downlink sub-band, and the third frequency domain resource set is the second frequency domain resource set.

In an alternative way, the second set of frequency domain resources comprises the same number of resource blocks as the first set of frequency domain resources.

In an alternative manner, the second set of frequency domain resources and the first set of frequency domain resources satisfy one or more of the following:

the starting position of the second frequency domain resource set and the ending position of the first frequency domain resource set are separated by K resource blocks;

the starting position of the second frequency domain resource set and the starting position of the first frequency domain resource set are separated by K resource blocks;

the end position of the second frequency domain resource set and the start position of the first frequency domain resource set are separated by K resource blocks;

the end position of the second frequency domain resource set and the end position of the first frequency domain resource set are separated by K resource blocks;

in an alternative way, the first set of frequency domain resources and the second set of frequency domain resources are symmetric about a first center, the first center being the center of the bandwidth portion BWP.

In an alternative manner, the first set of frequency domain resources and the second set of frequency domain resources are symmetric about a first center, the frequency domain resources on the first time unit comprise a first uplink subband, and the first center is the center of the first uplink subband.

In an alternative, the first time unit comprises a first uplink sub-band.

In a third aspect, the present application provides a communication method, which may be performed by a network device, or may be performed by a component (e.g., a chip or a circuit) of the network device, which is not limited thereto. The method comprises the following steps: the network device sends first information, wherein the first information indicates a first frequency domain resource set and a second frequency domain resource set of the channel state information reference signal, and the network device sends the channel state information reference signal on a third frequency domain resource set, and the third frequency domain resource set is determined according to the first frequency domain resource set and the second frequency domain resource set.

Some optional embodiments of the third aspect may refer to the description of the first aspect, and are not repeated here.

The advantages of any of the third aspects may be referred to the description of the first aspect, and are not repeated here.

In a fourth aspect, a communication method is provided, which may be performed by a network device, or may be performed by a component (e.g., a chip or a circuit) of the network device, which is not limited thereto. The method comprises the following steps: the network device sends first information, the first information indicates a first frequency domain resource set, the network device sends channel state information reference signals on the first frequency domain resource set and a second frequency domain resource set, and the second frequency domain resource set is determined according to the first frequency domain resource set.

Some optional embodiments of the fourth aspect may refer to the description of the second aspect, and are not repeated here.

The advantages of any of the fourth aspects may be referred to in the description of the second aspect, and are not described here.

In a fifth aspect, a communication apparatus is provided, where the communication apparatus may be a terminal device in an embodiment of the method provided in the first aspect or the second aspect, or a chip applied in the terminal device. The communication device comprises a processor and an interface circuit, wherein the interface circuit is used for receiving signals from other communication devices except the communication device and transmitting the signals to the processor or transmitting the signals from the processor to the other communication devices except the communication device, and the processor enables the communication device to execute the method executed by the terminal equipment in the embodiment of the method through the logic circuit or executing code instructions.

In a sixth aspect, a communication apparatus is provided, which may be a network device in the method embodiment provided in the third aspect or the fourth aspect, or a chip applied in the network device. The communication device comprises a processor and an interface circuit, wherein the interface circuit is used for receiving signals from other communication devices except the communication device and transmitting the signals to the processor or transmitting the signals from the processor to the other communication devices except the communication device, and the processor enables the communication device to execute the method executed by the first network equipment in the embodiment of the method through the logic circuit or executing code instructions.

In a seventh aspect, a communications apparatus is provided that includes a processor configured to receive first information indicating a first set of frequency domain resources and a second set of frequency domain resources of a channel state information reference signal, and a transceiver configured to determine a third set of frequency domain resources from the first set of frequency domain resources and the second set of frequency domain resources, the transceiver further configured to receive the channel state information reference signal on the third set of frequency domain resources.

In an eighth aspect, a communications apparatus is provided that includes a processor and a transceiver configured to receive first information indicating a first set of frequency domain resources for a channel state information reference signal, the processor configured to determine a second set of frequency domain resources from the first set of frequency domain resources, and a third set of frequency domain resources from the first set of frequency domain resources and the second set of frequency domain resources, the transceiver further configured to receive the channel state information reference signal on the third set of frequency domain resources.

In a ninth aspect, a communications apparatus is provided that includes a processor and a transceiver configured to transmit first information indicating a first set of frequency domain resources and a second set of frequency domain resources of a channel state information reference signal, the transceiver further configured to transmit the channel state information reference signal on a third set of frequency domain resources, wherein the third set of frequency domain resources is determined from the first set of frequency domain resources and the second set of frequency domain resources.

In a tenth aspect, a communications apparatus is provided that includes a processor and a transceiver configured to transmit first information indicating a first set of frequency domain resources for a channel state information reference signal, the processor configured to determine a second set of frequency domain resources based on the first set of frequency domain resources, the transceiver further configured to transmit the channel state information reference signal on a third set of frequency domain resources, wherein the third set of frequency domain resources is determined based on the first set of frequency domain resources and the second set of frequency domain resources.

In an eleventh aspect, the present application provides a computer readable storage medium storing instructions that, when executed by a communication apparatus, cause a method performed by a terminal device in the above first or second aspect, or cause a method performed by a network device in the above third or fourth aspect, to be performed.

In a twelfth aspect, the present application provides a computer program product comprising a computer program which, when run in parallel, causes the method performed by the terminal device in the first or second aspect described above, or causes the method performed by the network device in the third or fourth aspect described above to be performed.

In a thirteenth aspect, the present application provides a communication system comprising at least one communication device of the fifth aspect; the communication device of at least one sixth aspect.

In a fourteenth aspect, the present application provides a communication method, including a network device sending first information to a terminal device, where the first information indicates a first frequency domain resource set and a second frequency domain resource set of a channel state information reference signal, and the terminal device determines a third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set, and receives the channel state information reference signal on the third frequency domain resource set.

In a fifteenth aspect, the present application provides a communication method, where a network device sends first information to a terminal device, where the first information indicates a first frequency domain resource set of a channel state information reference signal, and the network device sends the channel state information reference signal in a third frequency domain resource set, where the second frequency domain resource set is determined according to the first frequency domain resource set, and the third frequency domain resource set is determined according to the first frequency domain resource set and the second frequency domain resource set.

Drawings

Fig. 1 is a schematic architecture diagram of a mobile communication system applied in an embodiment of the present application;

FIG. 2 is an example of a relationship between various time units in the present application;

fig. 3 is a schematic diagram of resource allocation under SBFD in the present application;

fig. 4 is a schematic diagram of resource allocation under SBFD in the present application;

FIG. 5 is a flow chart of a communication method in the present application;

FIG. 6 is a flow chart of a communication method in the present application;

FIG. 7 is a flow chart of a communication method in the present application;

FIG. 8 is a flow chart of a communication method in the present application;

FIG. 9 is a flow chart of a communication method in the present application;

FIG. 10 is a schematic diagram of a communication device according to the present application;

fig. 11 is a schematic diagram of a communication device in the present application.

Detailed Description

Fig. 1 is a schematic architecture diagram of a communication system 1000 to which embodiments of the present application apply. As shown in fig. 1, the communication system comprises a radio access network 100 and a core network 200, and optionally the communication system 1000 may further comprise the internet 300. The radio access network 100 may include at least one radio access network device (e.g., 110a and 110b in fig. 1) and may also include at least one terminal (e.g., 120a-120j in fig. 1). The terminal is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or may integrate the functions of the core network device and the logic functions of the radio access network device on the same physical device, or may integrate the functions of part of the core network device and part of the radio access network device on one physical device. The terminals and the radio access network device may be connected to each other by wired or wireless means. The access network device may be simply referred to as a network device, fig. 1 is only a schematic diagram, and the communication system may further include other network devices, for example, a wireless relay device and a wireless backhaul device, which are not shown in fig. 1.

The radio access network device, or network device, may be a base station (base station), an evolved NodeB (eNodeB), a transmission and reception point (transmission reception point, TRP), a next generation NodeB (gNB) in a fifth generation (5th generation,5G) mobile communication system, a next generation base station in a sixth generation (6th generation,6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; the present invention may also be a module or unit that performs a function of a base station part, for example, a Central Unit (CU) or a Distributed Unit (DU). The CU can complete the functions of a radio resource control protocol and a packet data convergence layer protocol (packet data convergence protocol, PDCP) of the base station and can also complete the functions of a service data adaptation protocol (service data adaptation protocol, SDAP); the DU performs the functions of the radio link control layer and the medium access control (medium access control, MAC) layer of the base station, and may also perform the functions of a part of the physical layer or the entire physical layer, and for a detailed description of the above protocol layers, reference may be made to the relevant technical specifications of the third generation partnership project (3rd generation partnership project,3GPP). The radio access network device may be a macro base station (e.g. 110a in fig. 1), a micro base station or an indoor station (e.g. 110b in fig. 1), a relay node or a donor node, etc. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the wireless access network equipment. For convenience of description, a base station will be described below as an example of a radio access network device.

A terminal may also be referred to as a terminal device (UE), a User Equipment (UE), a mobile station, a mobile terminal, etc. The terminal may be a cell phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, wireless modem (modem), computing device or other processing device connected to the wireless modem, augmented reality (augmented reality, AR) device, virtual Reality (VR) device, artificial intelligence (artificial intelligence, AI) device, etc. And may also include a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a personal digital assistant (personal digital assistant, PDA) computer, a tablet, a netbook, a handheld device (handheld), a laptop (lap computer), a cordless phone (cordis phone) or a wireless local loop (wireless local loop, WLL) station, a machine type communication (machine type communication, MTC) terminal, or a relay user equipment, etc. The relay user equipment may be, for example, a residential gateway (residential gateway, RG). For convenience of description, the above-mentioned devices are collectively referred to as a terminal in this application.

The terminal may be widely applied to various scenes, for example, device-to-device (D2D), vehicle-to-device (vehicle to everything, V2X) communication, machine-type communication (MTC), internet of things (internet of things, IOT), virtual reality, augmented reality, industrial control, autopilot, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, and the like.

The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the terminal.

The base station and the terminal may be fixed in position or movable. Base stations and terminals may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aircraft, balloons and satellites. The application scenes of the base station and the terminal are not limited in the embodiment of the application.

The roles of base station and terminal may be relative, e.g., helicopter or drone 120i in fig. 1 may be configured as a mobile base station, terminal 120i being the base station for those terminals 120j that access radio access network 100 through 120 i; but for base station 110a 120i is a terminal, i.e., communication between 110a and 120i is via a wireless air interface protocol. Of course, communication between 110a and 120i may be performed via an interface protocol between base stations, and in this case, 120i is also a base station with respect to 110 a. Thus, both the base station and the terminal may be collectively referred to as a communication device, 110a and 110b in fig. 1 may be referred to as a communication device having base station functionality, and 120a-120j in fig. 1 may be referred to as a communication device having terminal functionality.

Communication can be carried out between the base station and the terminal, between the base station and between the terminal and the terminal through the authorized spectrum, communication can be carried out through the unlicensed spectrum, and communication can also be carried out through the authorized spectrum and the unlicensed spectrum at the same time; communication can be performed through a frequency spectrum of 6 gigahertz (GHz) or less, communication can be performed through a frequency spectrum of 6GHz or more, and communication can be performed using a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more simultaneously. The embodiments of the present application do not limit the spectrum resources used for wireless communications.

In the embodiments of the present application, the functions of the base station may be performed by a module (such as a chip) in the base station, or may be performed by a control subsystem including the functions of the base station. The control subsystem comprising the base station function can be a control center in the application scenarios of smart power grids, industrial control, intelligent transportation, smart cities and the like. The functions of the terminal may be performed by a module (e.g., a chip or a modem) in the terminal, or by a device including the functions of the terminal.

In the application, a base station sends a downlink signal or downlink information to a terminal, and the downlink information is borne on a downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on an uplink channel.

Some terms or terminology referred to in this application are explained below.

1. Time cell

The time unit is a time domain unit for signal transmission, and may include a radio frame (radio frame), a subframe (subframe), a slot (slot), a minislot (mini-slot), or at least one orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol (symbol) or the like. OFDM symbols may also be referred to simply as symbols. Fig. 2 is a schematic diagram showing one possible time cell relationship in the present application. Referring to fig. 2, the time domain length of one radio frame is 10ms. One radio frame may include 10 radio subframes, and the time domain length of one radio subframe is 1ms. One radio subframe may include one or more slots, and in particular how many slots a subframe includes is related to a Subcarrier spacing (SCS). For the case of 15kHz for SCS, the time domain length of one slot is 1ms. One slot includes 14 symbols. In a New Radio (NR) system, a symbol may be understood as a minimum time unit, and thus, a symbol in the present application may be understood as a minimum time unit in a communication system. It should be understood that the symbol is only one name of the smallest time unit, and when the communication system is changed or evolved, the symbol in the present application may be replaced by the name corresponding to the smallest time unit in the changed communication system. Similarly, in the NR system, the time slot is the minimum unit of time domain resource scheduling, which is described in this application by taking the time slot as an example, it should be understood that, when the communication system is changed or evolved, the time slot in this application may also be replaced by a name corresponding to the minimum unit of time domain resource scheduling in the changed or evolved communication system.

2. Protective belt (guard band)

The guard band is a continuous segment of frequency domain resources that are located between two frequency domain resources with different transmission directions and are not used. The guard bands may be used to prevent cross-link interference before the frequency domain resources of different transmission directions.

For example, in a sub-band non-overlapping full duplex system, the guard band is a continuous length of frequency resources between the uplink and downlink sub-bands that are not used to prevent cross-link interference between the uplink and downlink sub-bands.

3. Time division duplexing (Time division duplex, TDD)

TDD is widely used in the deployment of New air interface (NR) wireless communication systems in fifth generation mobile communication systems (The fifth generation, 5G). TDD divides the time domain resources into uplink and downlink, as shown in table 1, which is one possible TDD uplink/downlink slot configuration.

TABLE 1

Time slot index	0	1	2	3	5
						Frequency domain configuration	D	D	D	S	U

Wherein D represents a downlink slot, each symbol in the downlink slot is a downlink symbol for downlink transmission, U represents an uplink slot, each symbol in the uplink slot is an uplink symbol for uplink transmission, S is a special slot, and the special slot at least includes flexible symbols. Flexible symbols may be configured to transmit both uplink and downlink signals. The TDD configuration in table 1 may also be referred to as DDDSU.

4. Frequency domain resource unit

For short, a block of frequency domain resources may be composed of one or more frequency domain resource units, and different frequency domain resource units may have different granularity. The resource units may include Resource Blocks (RBs), physical resource blocks (physical resource block, PRBs), resource Elements (REs), and the like. One set of frequency domain resources may include one or more frequency domain resource units.

5. Sub-band

One subband may be a segment of contiguous frequency domain resources within one carrier in the frequency domain, and one subband may be a subset of contiguous RBs within one bandwidth part (BWP) or one BWP.

The uplink sub-band is a sub-band that can be used for uplink transmission. For example, the uplink sub-band may include uplink resources and/or flexible resources, or the frequency domain resources included in the uplink sub-band may be used only for uplink transmission, e.g., the uplink sub-band includes uplink resources and not flexible resources. Correspondingly, the downlink sub-band is a sub-band that can be used for downlink transmission, for example, the downlink sub-band includes downlink resources and/or flexible resources, or the downlink sub-band includes frequency domain resources that can only be used for downlink transmission, and the downlink sub-band includes downlink resources and does not include flexible resources.

It should be understood that in this application, the subband is only one form of a set of frequency domain resources, and the present application does not impose any limitation on the size of the subband. The number of RBs included in different subbands may be the same or different.

6. Sub-band non-overlapping full duplex (SBFD).

Under TDD, uplink coverage of TDD decreases and delay increases due to limited uplink time domain resource allocation. The SBFD divides a frequency band on a slot configured as a downlink slot into one or more uplink subbands and one or more downlink subbands, and allows uplink information to be transmitted on the uplink subbands,

fig. 2 and 3 are examples of a slot configuration under SBFD of the present application.

Table 3 and fig. 4 show another example of a slot configuration under SBFD.

TABLE 3 Table 3

Compared with TDD, SBFD has more uplink resources to improve uplink coverage performance, and each time slot has uplink resources, so that uplink coverage can be improved. For example, uplink resources may be used for hybrid automatic repeat request Acknowledgement (HARQ-ACK) feedback to reduce latency.

7. SBFD time domain resource

In the present application, a time domain resource in which an uplink resource and a downlink resource are simultaneously divided on a frequency domain resource is referred to as an SBFD time domain resource. In connection with the above description of the time units, if the frequency domain resource of one time unit includes uplink resources and downlink resources, the time unit may be understood as one SBFD time unit, for example, an SBFD time slot, an SBFD symbol, etc., wherein one SBFD time slot includes at least one SBFD time slot. Alternatively, the slot in which the SBFD symbol is located is an SBFD slot. In table 2, slots with slot indexes of 0 to 3 are SBFD slots. In table 3, slots with slot indexes of 0 to 3 are SBFD slots.

8. Channel state information reference signal (Channel State Information-reference signal, CSI-RS)

The CSI-RS is used for channel measurement. The CSI-RS resources may include zero power channel state information reference signal resources (ZP-CSI-RS resources) and non-zero power channel state information reference signal resources (NZP-CSI-RS resources) NR, where CSI-RS is mainly used in the following aspects:

(1) Channel state information is obtained for resource scheduling, link adaptation, or multiple-input multiple-output (MIMO) -related transmission configuration.

(2) For beam management. For example, the terminal and the base station may acquire beamforming weights using the CSI-RS.

(3) For time-frequency tracking, for example, CSI-RS is TRS (Tracking Reference Signal).

(4) For mobility management. And the measurement requirements related to the mobility management of the UE are completed by acquiring and tracking the CSI-RS signals of the cell and the neighbor cells.

(5) For rate matching. Setting the CSI-RS signal with zero power completes the rate matching function of the Resource Element (RE) level of the data channel.

Currently, CSI-RS supports wideband configuration and narrowband configuration, but the CSI-RS resources must be a continuous frequency domain resource, and in SBFD scenario, the resources of one CSI-RS can only be allocated on one downlink subband. This results in a reduction of configurable CSI-RS, and also reduces the flexibility of CSI-RS resource allocation.

In addition, the current terminal maps the CSI-RS sequence to REs (k, l) according to the following formula (1) _p，u And (3) upper part.

n＝0,1,...

In the above formula, m' is an index of the CSI-RS sequence, or is understood as an index of the CSI-RS sequence mapped onto the subcarrier #k;a time slot number in a system frame for a time slot; k is a subcarrier index, k=0 indicating subcarrier 0 in common resource block (Common Resouce Block, CRB) 0; n is an index of the CRB where the subcarrier k is located (hereinafter referred to as crb#n); />Index of reference subcarrier in crb#n for subcarrier k, k' is relative +.>The number of offset subcarriers; l is an OFDM symbol index in one slot, if one slot includes 14 OFDM symbols, l=0, 1, 13; />Index of reference symbol within slot for symbol/; l' is the symbol l relative +.>The number of offset symbols of (a);the number of subcarriers in one RB is usually +.>ρ represents the density of CSI-RS on the frequency domain, given by the higher layer parameter density in the channel state information reference signal resource mapping cell (CSI-RS-ResourceMapping IE) or the channel state information reference signal cell mobility IE; x represents the port number of the CSI-RS and is indicated by a high-level parameter nrofPorts; beta _CSIRS Representing power control parameters, and determining according to a higher-layer parameter powercontrol offsetss in a non-zero power channel state information reference signal Resource element (NZP-CSI-RS-Resource IE) or a tracking reference signal Resource set element (TRS-Resource IE); parameter w _f (k') is a time-domain orthogonal cover code, w _t And (l') is a frequency domain orthogonal cover code.

It should be appreciated that within the configured CSI-RS bandwidth, the base station may map one CSI-RS for each RB, a pattern referred to as a CSI-RS density of 1. The base station may also map one CSI-RS every 2 RBs, a pattern called CSI-RS density of 0.5. For the case of density of 0.5, the configuration information of CSI-RS also needs to indicate the RBs that specifically carry CSI-RS in every two RBs.

As can be seen from the above description, currently, for CSI-RS resources, CSI-RS resources configured by a base station must be a continuous resource, resulting in low flexibility of CSI-RS resource configuration. In particular, in the SBFD system, the resources of the CSI-RS must be continuous and located in one downlink subband, which may cause limitation of the resource capacity of the CSI-RS. Therefore, the communication method is provided for improving the flexibility of the CSI-RS resource allocation and improving the accuracy of the CSI-RS measurement.

Further, if the densities of CSI-RS on the entire CSI-RS resource are the same, for the SBFD system, a guard band exists between the uplink subband and the downlink subband, and the interference suffered by a part of the resources on the CSI-RS resource close to the guard band is greater than the interference suffered by a part of the resources on the CSI-RS resource far from the guard band, and if the densities of CSI-RS on the entire CSI-RS resource are the same, the accuracy of CSI-RS measurement will be affected. Therefore, the application also provides a communication method for improving the accuracy of the CSI-RS measurement, in particular to improving the accuracy of the CSI-RS measurement under the SBFD.

Based on the network architecture provided in fig. 1, a communication method of the present application is described in detail below with reference to fig. 5.

S501, the base station sends first information, and the terminal receives the first information correspondingly.

Specifically, the first information indicates a first set of frequency domain resources and a second set of frequency domain resources of the CSI-RS.

In an alternative manner, the time domain resources corresponding to the first frequency domain resource set and the second frequency domain resource set are the same. That is, the first set of frequency domain resources and the second set of frequency domain resources are two sets of frequency domain resources over a first time unit.

Optionally, the frequency domain resource on the first time unit includes a plurality of downlink subbands, and the first frequency domain resource set and the second frequency domain resource set are respectively located in different downlink subbands, for example, the first frequency domain resource set is located in a first downlink subband on the first time unit, and the second frequency domain resource set is located in a second downlink subband on the first time unit. Optionally, the first downlink sub-band and the second downlink sub-band are discontinuous, or the first downlink sub-band and the second downlink sub-band are not adjacent, and one or more RBs are spaced between the first downlink sub-band and the second downlink sub-band.

Further optionally, the frequency domain resources on the first time unit include uplink frequency domain resources and downlink frequency domain resources. Alternatively, the first time unit is an SBFD time unit. The first set of frequency domain resources is located in a first downlink subband over a first time unit, the second set of frequency domain resources is located in a second downlink subband over the first time unit, and the frequency domain resources over the first time unit further comprise at least one uplink subband. In this way, the first time unit may be configured with uplink frequency domain resources and downlink frequency domain resources at the same time, and uplink coverage may be improved on the basis of improving the flexibility of frequency domain resource configuration of CSI-RS.

In an alternative, one uplink sub-band may be spaced between the first downlink sub-band and the second downlink sub-band. For example, the first time unit may be slots #0 to #3 in fig. 3.

Several ways in which the first information indicates the first set of frequency domain resources and the second set of frequency domain resources are given below.

First, the first information indicates a starting position S1 of the first set of frequency domain resources and a size N1 of the first set of frequency domain resources, and a starting position S2 of the second set of frequency domain resources and a size N2 of the second set of frequency domain resources. Optionally, S1 is an index of a starting RB of the first frequency domain resource set, S2 is an index of a starting RB of the second frequency domain resource set, N1 is a number of RBs in the first frequency domain resource set, N2 is a number of RBs in the second frequency domain resource set, and then the first frequency domain resource set includes N1 RBs consecutively from the index S1, and the second frequency domain resource set includes N2 RBs consecutively from the index S2.

Second, the first information indicates a start position S1 of the first set of frequency domain resources and an end position F1 of the first set of frequency domain resources, and a start position S2 of the second set of frequency domain resources and an end position F2 of the second set of frequency domain resources. The first frequency domain resource set comprises an index S1, an index F1 and an RB between the S1 and the F1; the second set of frequency domain resources includes an index S2, an index F2, and RBs between S2 and F2. In other words, the first set of frequency domain resources is denoted { S1, F1}, and the second set of frequency domain resources is denoted { S2, F2}.

Third, the first information indicates a starting position S1 of the first set of frequency domain resources and a size N1 of the first set of frequency domain resources, and a size N2 of the second set of frequency domain resources. The starting position S2 of the second set of frequency domain resources is predefined or preconfigured.

In the above manner, the first information may be an NZP-CSI-RS-Resource IE, a ZP-CSI-RS-Resource IE, a CSI-RS frequency domain occupation cell (CSI-FrequencyOccupation IE), and a CSI-RS Resource allocation mobile cell CSI-RS-ResourceConfigMobility IE. The CSI-RS measures the bandwidth cell CSI-RS-measurementBW IE, or TRS-ResourceSet IE.

Further, the first information may indicate the first set of frequency domain resources and the second set of frequency domain resources simultaneously through one field. The first information indicates startingRB, nrofRBs, startingRB and nrofRBs2 through one field, and indicates a start RB of the first frequency domain resource set, a number of RBs included in the first frequency domain resource set, a start RB of the second frequency domain resource, and a number of RBs included in the second frequency domain resource set, respectively. For another example, the first information indicates startingPRB, nrofPRBs, startingPRB and nrofPRBs2 by one field, respectively, a starting RB of the first frequency domain resource set, a number of RBs included in the first frequency domain resource set, a starting RB of the second frequency domain resource, and a number of RBs included in the second frequency domain resource set.

In another alternative, the first information includes a first field indicating a first set of frequency domain resources and a second field indicating a second set of frequency domain resources. For example, the first information includes a first field and a second field, the first field being freqBand, including startingrbs and nrofRBs, respectively representing a starting RB index of the first frequency domain resource set and the number of included RBs; the second field is freqBand2, including startingrbs and nrofRBs, and represents the starting RB index of the second set of frequency domain resources and the number of RBs included, respectively. For another example, the first information includes a first field and a second field, the first field being freqBand, including startingprbs and nrofPRBs, respectively representing a starting PRB index of the first frequency domain resource set and the number of included PRBs; the second field is freqBand2, comprising startingprbs and nrofPRBs, representing the starting PRB index and the number of included PRBs of the second frequency domain resource set, respectively.

S502: and the terminal determines a third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set.

Specifically, when the relation between the first frequency domain resource set and the second frequency domain resource set is different, RBs included in the third frequency domain resource set are also different.

Optionally, the first set of frequency domain resources and the second set of frequency domain resources are each comprised of contiguous RBs, i.e., the RBs comprised by the first set of frequency domain resources are contiguous and the RBs comprised by the second set of frequency domain resources are also contiguous.

Optionally, there is a discontinuity between the first set of frequency domain resources and the second set of frequency domain resources. In the mode, the base station can improve the flexibility of the frequency domain resource allocation of the CSI-RS by configuring the frequency domain resources of the two discontinuous CSI-RSs.

S503: the terminal receives the CSI-RS on the third set of frequency domain resources.

In particular, the third set of frequency domain resources is related to the first set of frequency domain resources and the second set of frequency domain resources, several possible ways being given below.

In a first mode, the first frequency domain resource set and the second frequency domain resource set are both CSI-RS resources, and the base station configures the first frequency domain resource set of the CSI-RS and the second frequency domain resource set of the CSI-RS through the first information. The third set of frequency domain resources is a union of the first set of frequency domain resources and the second set of frequency domain resources. In the first mode, the first information indicates the first frequency domain resource of the CSI-RS and the second frequency domain resource of the CSI-RS, and the third frequency domain resource set is a union set of the first frequency domain resource set and the second frequency domain resource set. The terminal may not need to determine the third set of frequency domain resources, but may receive CSI-RS directly on the first set of frequency domain resources and the second set of frequency domain resources. That is, in this manner, S502 may be optional.

In a second mode, the first frequency domain resource set is a frequency domain resource set of the CSI-RS, and the second frequency domain resource set is a frequency domain resource set which cannot be used for receiving the CSI-RS in the first frequency domain resource. In this manner, the second set of frequency domain resources is a proper subset of the first set of frequency domain resources and the third set of frequency domain resources is a difference set of the first set of frequency domain resources and the second set of frequency domain resources. Or, the third set of frequency domain resources is the frequency domain resources of the first set of frequency domain resources except the second set of frequency domain resources. In the second mode, the terminal may determine the third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set, or may directly receive the CSI-RS on the frequency domain resources in the first frequency domain resource set except for the second frequency domain resource set, that is, in the second mode, S502 may be optional. In the second mode, optionally, the first frequency domain resource set may be a resource of the CSI-RS of the first time unit under BWP, and the second frequency domain resource set may be a resource of the first time unit under SBFD that cannot be used for receiving the CSI-RS. In the mode, the first information indicates that the CSI-RS resources of the CSI-RS under the BWP and the CSI-RS cannot be used for receiving the CSI-RS resources under the SBFD, so that the terminal equipment can inform and acquire the CSI-RS configuration under different systems through the first information, and the compatibility of the CSI-RS resource configuration to different communication systems is improved.

In a third aspect, the first frequency domain resource set may be composed of RBL1 with the smallest resource index, RBL2 with the largest resource index, and RB between L1 and L2 in the first frequency domain resource set and the second frequency domain resource set. For example, the first set of frequency domain resources includes N1 RBs consecutively from S1, and the second set of frequency domain resources includes N2 RBs consecutively from S2. The third set of frequency domain resources may represent an RB that includes starting from min { S1, S2} to max { s1+n1, s2+n2 }. For example, the first set of frequency domain resources is freqBand, the second set of frequency domain resources is freBand2, and the third resources can be expressed as min { freqBand, freqBand2} -max { freqBand, freqBand2}. Specifically, for example, the first set of frequency domain resources includes RBs having indices of 3 to 7, and the second set of frequency domain resources includes RBs having indices of 11 to 15. The third set of frequency domain resources consists of RBs with indices of 3 through 15. In the third mode, the terminal may determine the third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set, or may directly receive the third frequency domain resource set on { min { S1, S2}, max { s1+n1, s2+n2} }, that is, in the third mode, S502 may be optional.

In a fourth aspect, the third set of frequency domain resources is a second set of frequency domain resources, where the second set of frequency domain resources is located in one downlink subband, and the first set of frequency domain resources is not located or is not completely located in any downlink subband. Or, when the base station has configured the first frequency domain resource set and the second frequency domain resource set, wherein one frequency domain resource set is located in the downlink sub-band, and the other frequency domain resource is not located or is not completely located in one downlink sub-band, the terminal uses one frequency domain resource set located in the downlink sub-band of the two frequency domain resource sets configured by the base station as the frequency domain resource of the receiving state information reference signal.

Based on the network architecture provided in fig. 1, another communication method of the present application is described in detail below in conjunction with fig. 6.

S601: the base station sends the first information, and the terminal receives the first information.

Specifically, the first information indicates a first set of frequency domain resources of the CSI-RS. S602: and the base station determines a second frequency domain resource set of the CSI-RS according to the first frequency domain resource. Correspondingly, the terminal determines a second frequency domain resource set of the CSI-RS based on the first frequency domain resource set. In an alternative manner, the time domain resources corresponding to the first frequency domain resource set and the second frequency domain resource set are the same. The first set of frequency domain resources and the second set of frequency domain resources are two sets of frequency domain resources over a first time unit. In the mode, the base station indicates the first frequency domain resource set of the CSI-RS, and the terminal determines the frequency domain resource sets of the two CSI-RSs by predefining or pre-configuring the relation between the first frequency domain resource set and the second frequency domain resource set, so that the flexibility of the frequency domain resource configuration of the CSI-RSs is improved.

Optionally, the frequency domain resource on the first time unit includes a plurality of downlink subbands, and the first frequency domain resource set and the second frequency domain resource set are respectively located in different downlink subbands, for example, the first frequency domain resource set is located in a first downlink subband on the first time unit, and the second frequency domain resource set is located in a second downlink subband on the first time unit. Further alternatives of the first set of frequency domain resources and the second set of frequency domain resources may be referred to the related description in step S501, and will not be described here again. For example, a discontinuity between the first set of frequency domain resources and the second set of frequency domain resources. As another example, the frequency domain resources on the first time unit include uplink frequency domain resources and downlink frequency domain resources. Alternatively, the first time unit is an SBFD time unit. The first set of frequency domain resources is located in a first downlink subband over a first time unit, the second set of frequency domain resources is located in a second downlink subband over the first time unit, and the frequency domain resources over the first time unit further comprise at least one uplink subband. In this way, the first time unit may be configured with uplink frequency domain resources and downlink frequency domain resources at the same time, so that on the basis of improving uplink coverage, the frequency domain resource configuration flexibility of the CSI-RS is improved.

How to determine the second set of frequency domain resources from the first set of frequency domain resources is given below as a few examples. In other words, the relationship of the first set of frequency domain resources and the second set of frequency domain resources satisfies one or more of the following examples.

Example 1: the first set of frequency domain resources and the second set of frequency domain resources are the same size.

Example 2: the number of RBs comprised by the first set of frequency domain resources and the number of RBs comprised by the second set of resources satisfy a predefined relationship, e.g. the number of RBs comprised by the second set of frequency domain resources is equal to the product of the number of RBs comprised by the first set of frequency domain resources and a scaling factor α, or α may be the ratio of the width of the second downlink sub-band where the second set of frequency domain resources is located to the width of the first downlink sub-band where the first set of frequency domain resources is located, or α may also be indicated by the base station by signaling, e.g. the base station by radio resource control (radio resource control, RRC) signaling, optionally 0 < α < 3.

Example 3: the resource locations of the first set of frequency domain resources and the second set of frequency domain resources satisfy a predefined relationship. Several examples are given below in (1) to (4).

(1) The starting position S2 of the second set of frequency domain resources is spaced apart from the starting position of the first set of frequency domain resources by K RBs. For example, the first set of frequency domain resources consists of RBs of consecutive N1 starting with S1, and the second set of frequency domain resources consists of RBs of consecutive N1 starting with s1+k.

(2) The starting position of the second set of frequency domain resources is separated from the ending position of the first set of frequency domain resources by K RBs. For example, the first set of frequency domain resources consists of RBs of consecutive N1 starting with S1, and the second set of frequency domain resources consists of RBs of consecutive N1 starting with s1+n1+k.

(3) The end position of the second set of frequency domain resources is spaced apart from the start position of the first set of frequency domain resources by K RBs. For example, the first set of frequency domain resources consists of RBs of consecutive N1 starting with S1, and the second set of frequency domain resources consists of RBs of consecutive N1 starting with s1+n1-K.

(4) The end position of the second set of frequency domain resources is spaced apart from the end position of the first set of frequency domain resources by K RBs. For example, the first set of frequency domain resources consists of RBs of consecutive N1 starting with S1, and the second set of frequency domain resources consists of RBs of consecutive N1 starting with S1-K.

In the above (1) to (4), K may be predefined or preconfigured, or may be signaled. In an alternative way, K is the interval between starting frequency units of PDSCH on two downlink subbands when PDSCH is transmitted on two non-adjacent downlink subbands. In another alternative, the base station pre-configures the relationship between α and K and indicates this by RRC signaling.

Example 4: the first set of frequency domain resources and the second set of frequency domain resources may be of the same size, and the first set of frequency domain resources and the second set of frequency domain resources may be mirror symmetrical, or the first set of frequency domain resources and the second set of frequency domain resources may be symmetrical about a first center, which may optionally be the center of the bandwidth portion BWP, or the first center may be the center of the uplink sub-band. The first uplink sub-band is located between the first downlink sub-band and the second downlink sub-band.

For example, the index of the RB of the first centerWherein [ among others ]]Representing a rounding operation, e.g. rounding up, rounding down, or rounding up, +.>The number of RBs representing BWP or the number of RBs of an uplink subband. In example 2, the index S2 of the RB of the starting position in the second frequency domain resource set and the size N2 of the second frequency domain resource set satisfy:

S2＝2RB _c -S1-N1；N2＝N1。

in example 4, the RB of the first center is not included in the first frequency domain resource set.

Optionally, S603: and the terminal determines a third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set.

Specifically, the third frequency domain resource set is a union of the first frequency domain resource set and the second frequency domain resource set. Step S603 may also be optional, similar to the first to third modes in step S502.

S604: the base station transmits the CSI-RS on a third set of frequency domain resources. Correspondingly, the terminal receives the CSI-RS on the third frequency domain resource set.

In the method shown in fig. 5 and fig. 6, in an alternative embodiment, when the first frequency domain resource set and the second frequency domain resource set are located in the first downlink subband and the second downlink subband, respectively, and the first downlink subband and the second downlink subband are separated by a first uplink subband, optionally, when mapping the CSI-RS sequence onto the CSI-RS resource, the resource index of the first frequency domain resource set and/or the resource index of the second frequency domain resource set are modified based on the above formula (1). Each of which is described below.

In the first modification, in the first frequency domain resource set, the index of the RB with the smallest index of the CRB is S1, and in the second frequency domain resource set, the index of the RB with the smallest index of the CRB is S2, where S1 is smaller than S2. When mapping the CSI-RS sequence, the index of each RB in the second frequency domain resource set is corrected to be n-offset, wherein n is the index of the CRB of each RB in the RBs in the second frequency domain resource set, and offset is the index of the RB with the largest CRB resource index in the first frequency domain resource set. The first mode may also be understood that the CSI-RS sequence is mapped to RBs in the first frequency domain resource set according to the above formula (1). Mapping the CSI-RS sequence onto RBs in the second set of frequency domain resources according to equation (2), equation (2) mapping the CSI-RS sequence in equation (1) N in (c) is replaced by (n+offset), and the other portions are identical to the formula (1). Where (n+offset) is the index of the CRB where subcarrier k is located. The offset is the index of the RB with the largest CRB index in the first frequency domain resource set.

Modification mode II: the RBs in the first frequency domain resource set and the second frequency domain resource set are orderly ordered according to the descending order of the CRB indexes, and the RBs in the first frequency domain resource set and the second frequency domain resource set are numbered from 1 to be used as index numbers after resource correction when mapping the CSI-RS sequence according to the descending order of the CRB indexes. For example, the first set of frequency domain resources includes RBs having CRB indexes of 10, 11, 12, 13, 14, 15, respectively; the second set of frequency domain resources includes CRB indexes of RBs of 20, 21, 22, 23, 24, 25, respectively. In the second mode, when mapping the CSI-RS sequence, the modified indexes of RBs included in the first frequency domain resource set are 1,2,3,4,5; the second set of frequency domain resources includes modified indices of RBs of 6,7,8,9, 10. In the second modification, for the index of the modified RB, taking numbering from 0 on mapping CSI-RS resources as an example, it should be understood that the numbering may also start from 1, or start from a preconfigured value, and the starting value of the numbering is not limited in this application.

Based on the network architecture provided in fig. 1, another communication method of the present application is described in detail below in conjunction with fig. 7.

S701: the base station sends the first information, and the terminal receives the first information.

Specifically, the first information indicates the first frequency domain resource set and the second frequency domain resource set of the CSI-RS, which may be described with reference to step S501 in fig. 5, and will not be described in detail.

Alternatively, the first information indicates a first set of frequency domain resources of the CSI-RS. The second set of frequency domain resources is determined from the first set of frequency domain resources. Specifically, reference may be made to the relevant descriptions in steps S601 and S602 in fig. 6, which are not repeated here.

In an alternative way, the first set of frequency domain resources and the second set of frequency domain resources are sets of frequency domain resources over a first time unit.

S702: and the terminal determines the receiving resource of the CSI-RS according to the type of the first time unit.

Specifically, when the types of the first time units are different, the resources of the terminals for receiving the CSI-RS are also different. Or, the types of the first time units are different, and the determination modes of the terminals on the resources for receiving the CSI-RS are also different. For convenience of description, the following description will take a case that a resource of the terminal receiving the CSI-RS is a third set of frequency domain resources.

In an optional manner, the first time unit is an SBFD time unit, the first frequency domain resource set and the second frequency domain resource set are respectively located on different downlink subbands of the first time unit, and the terminal may determine the third frequency domain resource set according to the above manner.

In an optional manner, the first time unit is an SBFD time unit, the second frequency domain resource is located in one downlink subband, the first set of frequency domain resources is not located or is not completely located in any downlink subband, and the terminal determines the third set of frequency domain resources according to the fourth manner.

In an alternative manner, the first time unit is an SBFD time unit, and there is only one downlink subband on the first time unit, the terminal may default the first frequency domain resource set to be the third frequency domain resource set, where the terminal does not expect the first frequency domain resource set to be in the downlink subband. Or the terminal may default the second set of frequency domain resources to a third set of frequency domain resources. Wherein the terminal does not expect the second set of frequency domain resources not to be in the downlink sub-band.

In an alternative manner, the first time unit is a downlink time unit, that is, the frequency domain resources on the first time unit are all used for downlink transmission. And the terminal determines a third frequency domain resource set according to the third mode.

In an alternative way, the second set of frequency domain resources is a proper subset of the first set of frequency domain resources, the first time unit is an SBFD time unit, and the frequency domain resources of the first time unit include at least two non-adjacent downlink sub-bands, such as time slots #0 to #3 in fig. 3. And the terminal determines a third frequency domain resource set according to the second mode.

In an alternative manner, the second set of frequency domain resources is a proper subset of the first set of frequency domain resources, the first time unit is a downlink time unit, and the terminal determines the third set of frequency domain resources to be the first set of frequency domain resources. Alternatively, the first set of frequency domain resources may be resources of CSI-RS of the first time unit under BWP, and the second set of frequency domain resources may be resources of the first time unit under SBFD that cannot be used for receiving CSI-RS. Because in the SBFD system, an uplink sub-band or a guard band exists, the first time unit has a resource where the terminal cannot receive the CSI-RS under the SBFD, and the method can determine the received CSI-RS resource by removing the resource of the CSI-RS under the BWP, which cannot be used for receiving the CSI-RS resource under the SBFD.

S703: and the base station transmits the CSI-RS on the third frequency domain resource set, and correspondingly, the terminal receives the CSI-RS resource on the third frequency domain resource set.

In the method shown in fig. 7, the terminal may understand the first information in different manners according to the type of the first time unit, or the terminal may determine the frequency domain resource of the CSI-RS in different manners according to the type of the first time unit. The resources of the CSI-RS can be used on different time unit types, so that the flexibility of the frequency domain resource allocation of the CSI-RS is improved.

Based on the network architecture provided in fig. 1, another communication method of the present application is described in detail below in conjunction with fig. 8.

S801: the base station sends the first information, and the terminal receives the first information.

Specifically, the first information indicates a first set of frequency domain resources of the CSI-RS.

S802: the terminal receives the CSI-RS on the first set of frequency domain resources.

Specifically, the density of CSI-RS received by the terminal on the first set of frequency domain resources is two or more. That is, the density of CSI-RS received by the terminal on the first set of frequency domain resources is not unique.

In an alternative manner, each CSI-RS density corresponds to a subset of frequency domain resources, each subset of frequency domain resources being located in the first set of frequency resources, and the subsets of frequency domain resources being mutually exclusive. For example, a plurality of { frequency resource subsets, densities }, may be configured, CSI-RS being transmitted on the frequency resource subsets using the corresponding densities.

In an alternative way, the resource mapping formula of the CSI-RS is modified. Index (k, l) of RBs for receiving CSI-RS in first set of frequency domain resources _p，u Satisfies the above formula (1), and redefines n in the formula (1). N is understood to be the index of the allocated relative RBs, not the index of the CRB. Regarding the modification of n to the index of relative RB, reference may be made to fig. 5 and 6 for the first frequencyThe second modification manner of the indexes of the RBs in the domain resource set and the second frequency domain resource set is not described herein.

Further, modify equation (1)Is->Wherein m 'represents max (m') when n-1.

In the method described in fig. 8, for the first frequency domain resource set, by configuring the densities of CSI-RS on the resources in different areas, the densities of CSI-RS on a portion of the frequency domain resources closer to the guard band in the first frequency domain resource set are greater, so as to improve the measurement accuracy.

For example, the base station may configure a CSI-RS resource division manner according to distances between different resources and guard bands in the CSI-RS resource, where the CSI-RS resource includes M resource subsets that are not overlapped with each other, and the M resource subsets may correspond to two or more CSI-RS densities.

Based on the network architecture provided in fig. 1, another communication method of the present application is described in detail below in conjunction with fig. 9.

S901: the base station sends the first information, and the terminal receives the first information.

S902: the terminal receives the CSI-RS on the first set of frequency domain resources.

Specifically, the period of the terminal for receiving the CSI-RS on the first set of frequency domain resources is two or more. That is, the periodicity of the terminal receiving the CSI-RS on the first set of frequency domain resources is not unique.

In an alternative manner, in the first frequency domain resource set, on a part of RBs close to the guard band, the transmission period of the CSI-RS is T1, and on a part of RBs far from the guard band, the transmission period of the CSI-RS is T2, where T1 is smaller than T2. That is, the transmission period of the CSI-RS on the RBs close to the guard band is shorter.

In an alternative manner, the CSI-RS resource includes a plurality of { frequency domain resource subsets, period } parameters, the base station uses a corresponding period to transmit the CSI-RS on each frequency domain resource subset, and the terminal uses a corresponding period to receive the CSI-RS on each frequency domain resource subset.

In the method described in fig. 9, for the first frequency domain resource set, by configuring the transmission periods of CSI-RS on RBs in different areas, the transmission period of CSI-RS on a portion of the frequency domain RBs closer to the guard band in the first frequency domain resource set is smaller, so as to improve the measurement accuracy.

It should be noted that the methods of fig. 8 and 9 may be combined, i.e. the transmission of CSI-RS may be adjusted from both a density and a transmission period perspective.

Further, the methods described in fig. 8 and/or 9 may also be combined with any one or more of the methods described above with respect to fig. 5-7. For example, in any of the methods of fig. 5 to fig. 7, the terminal may refer to the method described in fig. 8, the method shown in fig. 9, or the methods shown in fig. 8 and fig. 9, by receiving the density of CSI-RS on RBs in the third frequency domain resource set. It will be appreciated that, in order to implement the functions in the above embodiments, the base station and the terminal include corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application scenario and design constraints imposed on the solution.

Fig. 10 and 11 are schematic structural diagrams of a possible communication device according to an embodiment of the present application. These communication devices may be used to implement the functions of the terminal or the base station in the above method embodiments, so that the beneficial effects of the above method embodiments may also be implemented. In the embodiment of the present application, the communication device may be one of the terminals 70a-70j shown in fig. 1, or may be the base station 60a or 60b shown in fig. 1, or may be a module (e.g. a chip) applied to the terminal or the base station.

As shown in fig. 10, the communication apparatus 1000 includes a processing unit 1010 and a transceiver unit 1020. The communication device 1000 is used to implement the functions of the terminal or base station in the method embodiments shown in fig. 5 to 9 described above.

When the communication device 1000 is used for the functions of a terminal in the method embodiments shown in fig. 5 to 9: the transceiver unit 1020 is configured to receive the first information. The transceiver unit 1020 is further configured to receive CSI-RS. The processing unit 1010 is configured to determine a resource for receiving the CSI-RS.

The above-mentioned more detailed description of the processing unit 1010 and the transceiver unit 1020 can be directly obtained by referring to the related description in the method embodiments shown in fig. 5 to 9, which is not repeated herein.

When the communication device 1000 is used to implement the functionality of a base station in the method embodiments shown in fig. 5 to 9: the transceiver unit 1020 is configured to transmit the first information. The processing unit 1010 may be optional. When the communication apparatus 1000 comprises a processing unit 1010, in an alternative way, the processing unit 1010 may be configured to determine resources for transmitting CSI-RS, e.g. the processing unit 1010 is configured to determine the second set of frequency domain resources from the first set of frequency domain resources, or to determine the third set of frequency domain resources.

As shown in fig. 11, the communication device 1100 includes a processor 1110 and an interface circuit 1120. The processor 1110 and the interface circuit 1120 are coupled to each other. It is understood that the interface circuit 1120 may be a transceiver or an input-output interface. Optionally, the communication device 1100 may further include a memory 1130 for storing instructions to be executed by the processor 1110 or for storing input data required by the processor 1110 to execute instructions or for storing data generated after the processor 1110 executes instructions.

When the communication device 1100 is used to implement the method shown in fig. 10, the processor 1110 is used to implement the functions of the processing unit 1010, and the interface circuit 1120 is used to implement the functions of the transceiver unit 1020.

When the communication device is a chip applied to the terminal, the terminal chip realizes the functions of the terminal in the embodiment of the method. The terminal chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent to the terminal by the base station; alternatively, the terminal chip sends information to other modules in the terminal (e.g., radio frequency modules or antennas) that the terminal sends to the base station.

When the communication device is a module applied to a base station, the base station module realizes the functions of the base station in the method embodiment. The base station module receives information from other modules (such as radio frequency modules or antennas) in the base station, the information being transmitted by the terminal to the base station; alternatively, the base station module transmits information to other modules in the base station (e.g., radio frequency modules or antennas) that the base station transmits to the terminal. The base station module may be a baseband chip of a base station, or may be a DU or other module, where the DU may be a DU under an open radio access network (open radio access network, O-RAN) architecture.

It is to be appreciated that the processor in embodiments of the present application may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

The method steps in the embodiments of the present application may be implemented in hardware, or in software instructions executable by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. The storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a base station or terminal. The processor and the storage medium may reside as discrete components in a base station or terminal.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs; but also semiconductor media such as solid state disks. The computer readable storage medium may be volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage medium.

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/", generally indicates that the associated object is an or relationship; in the formulas of the present application, the character "/" indicates that the front and rear associated objects are a "division" relationship. "including at least one of A, B and C" may mean: comprises A; comprises B; comprising C; comprises A and B; comprises A and C; comprises B and C; including A, B and C.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.

Claims

1. A method of communication, the method comprising:

receiving first information, wherein the first information indicates a first frequency domain resource set and a second frequency domain resource of a channel state information reference signal;

determining a third frequency domain resource set according to the first frequency domain resource set and the second frequency domain resource set, wherein the first frequency domain resource set and the second frequency domain resource set are two frequency domain resource sets on a first time unit;

the channel state information reference signal is received on the third set of frequency domain resources.

2. The method of claim 1, wherein,

the first frequency domain resource set and the second frequency domain resource set are discontinuous in frequency domain, and the third frequency domain resource set is a union set of the first frequency domain resource set and the second frequency domain resource set; or alternatively

The second frequency domain resource set is a proper subset of the first frequency domain resource set, and the third frequency domain resource set is a difference set of the first frequency domain resource set and the second frequency domain resource set; or alternatively

And among the resource blocks included in the first frequency domain resource set and the second frequency domain resource set, the index of the resource block with the smallest index is L1, the index of the resource block with the largest index is L2, the third frequency domain resource set includes the resource block with the index of L1, the resource block with the index of L2, and the resource block with the index greater than L1 and less than L2.

3. The method of claim 1 or 2, wherein the first information indicates a starting position S1 of the first set of frequency domain resources and a starting position S2 of the second set of frequency domain resources, and a size N1 of the first set of frequency domain resources and a size N2 of the second set of frequency domain resources.

4. The method of any of claims 1-3, wherein the first information comprises a first field indicating the first set of frequency domain resources and a second field indicating the second set of frequency domain resources.

5. The method of any of claims 1-4, wherein the first set of frequency domain resources is located in a first downlink sub-band and the second set of frequency domain resources is located in a second downlink sub-band.

6. The method of claim 1, the first set of frequency domain resources being located in a first downlink subband, the second set of frequency domain resources not being located in or not entirely located in any downlink subband, the third set of frequency domain resources being the first set of frequency domain resources.

7. A method of communication, the method comprising:

receiving first information, wherein the first information indicates a first frequency domain resource set of a channel state information reference signal;

Determining a second frequency domain resource set according to the first frequency domain resource set;

determining a third set of frequency domain resources from the first set of frequency domain resources and the second set of frequency domain resources;

a channel state information reference signal is received on the third set of frequency domain resources.

8. The method of claim 7, wherein,

The index of the resource block with the smallest index is L1, the index of the resource block with the largest index is L2, the third frequency domain resource set comprises the resource block with the index of L1, the resource block with the index of L2, and the resource block with the index larger than L1 and smaller than L2; or alternatively

The first frequency domain resource set is located in a first downlink sub-band, the second frequency domain resource set is not located in or is not completely located in any downlink sub-band, and the third frequency domain resource set is the first frequency domain resource set; or alternatively

The second frequency domain resource set is located in a second downlink sub-band, the first frequency domain resource set is not located or is not completely located in any downlink sub-band, and the third frequency domain resource set is the second frequency domain resource set.

9. The method of claim 7 or 8, wherein the second set of frequency domain resources comprises the same number of resource blocks as the first set of frequency domain resources.

10. The method of any of claims 7-9, wherein the second set of frequency domain resources and the first set of frequency domain resources satisfy one or more of:

the starting position of the second frequency domain resource set and the starting position of the first frequency domain resource set are separated by K resource blocks; or,

the first frequency domain resource set and the second frequency domain resource set are symmetrical about a first center, wherein the first center is a center of a bandwidth part BWP, or the frequency domain resource on the first time unit includes a first uplink sub-band, and the first center is a center of the first uplink sub-band.

11. A method of communication, the method comprising:

transmitting first information, wherein the first information indicates a first frequency domain resource set and a second frequency domain resource set of a channel state information reference signal;

and transmitting the channel state information reference signal on the third frequency domain resource set, wherein the third frequency domain resource set is determined according to the first frequency domain resource set and the second frequency domain resource set, and the first frequency domain resource set and the second frequency domain resource set are two frequency domain resource sets on a first time unit.

12. The method of claim 11, wherein the first set of frequency domain resources and the second set of frequency domain resources are discontinuous, and wherein the third set of frequency domain resources is a union of the first set of frequency domain resources and the second set of frequency domain resources; or alternatively

And the index of the resource block with the minimum index is L1, the index of the resource block with the maximum index is L2, the third frequency domain resource set comprises the resource block with the index of L1, the resource block with the index of L2, and the resource block between the resource block with the index of L1 and the resource block with the index of L2.

13. The method of claim 11 or 12, wherein the first information indicates a starting position S1 of the first set of frequency domain resources and a starting position S2 of the second set of frequency domain resources, and a size N1 of the first set of frequency domain resources and a size N2 of the second set of frequency domain resources.

14. The method of any of claims 11-13, wherein the first information comprises a first field indicating the first set of frequency domain resources and a second field indicating the second set of frequency domain resources.

15. The method of any of claims 11-14, wherein the first set of frequency domain resources is located in a first downlink sub-band and the second set of frequency domain resources is located in a second downlink sub-band.

16. The method of claim 11, the second set of frequency domain resources is located in a first downlink subband, the first set of frequency domain resources is not located or is not entirely located in any downlink subband, and the third set of frequency domain resources is the second set of frequency domain resources.

17. A method of communication, the method comprising:

transmitting first information, wherein the first information indicates a first frequency domain resource set of a channel state information reference signal;

And transmitting the channel state information reference signal on the third frequency domain resource set, wherein the second frequency domain resource set is determined according to the first frequency domain resource set, and the third frequency domain resource set is determined according to the first frequency domain resource set and the second frequency domain resource set.

18. The method of claim 17, wherein the step of determining the position of the probe is performed,

19. The method of claim 17 or 18, wherein the second set of frequency domain resources comprises the same number of resource blocks as the first set of frequency domain resources.

20. The method of any of claims 17-19, wherein the second set of frequency domain resources and the first set of frequency domain resources satisfy one or more of:

the first frequency domain resource set and the second frequency domain resource set are symmetrical about a first center, wherein the first center is a center of a bandwidth part BWP, or the frequency domain resource on the first time unit further comprises a first uplink sub-band, and the first center is a center of the first uplink sub-band.

21. A communication device comprising at least one processor and interface circuitry for receiving signals from other communication devices than the communication device and transmitting signals from the at least one processor to the processor or to other communication devices than the communication device, the at least one processor being configured to implement the method of any of claims 1-10 or 11-20 by logic circuitry or executing code instructions.

22. A computer readable storage medium storing instructions which, when executed, implement the method of any one of claims 1-10 or 11-20.

23. A computer program product, the computer program product comprising: computer program which, when run, causes the method according to any one of claims 1-10 or claims 11-20 to be performed.