Signal sending method and communication apparatus

Abstract

The embodiments of the present application relate to the technical field of communications. Provided are a signal sending method and a communication apparatus, which can support the requirement of an SRS, which is used for beamforming, for single-user high-rank scheduling, thereby improving the downlink transmission performance. By means of the method, two SRS resources may be allocated, wherein the two SRS resources are associated with the same CSI-RS, and a plurality of different precodes can be obtained on the basis of the CSI-RS. SRSs are sent on the two SRS resources using different periods and different precodes, such that downlink channel information of ranks, the number of which is greater than the number of SRS ports occupied by each SRS resource, is obtained at a network side. Alternatively, by means of the method, one SRS resource may be allocated, wherein a precode is transformed on the SRS resource according to a preset period, such that the downlink channel information of the ranks, the number of which is greater than the number of SRS ports occupied by each RSR resource, is obtained at the network side.

Description

Method of transmitting a signal and communication device

[0001] The present application claims priority from the Chinese patent application No. 202411338624.4 filed on September 24, 2024, and entitled "Method of transmitting a signal and communication device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, and in particular to a method of transmitting a signal and a communication device. BACKGROUND

[0003] In future communication systems, larger base station arrays and larger terminal arrays will become an inevitable trend of multiple-input multiple-output (MIMO) system evolution. Both the network device side and the terminal side can support more channel numbers to improve the performance of transmission or reception. However, while more channel numbers bring better performance, the measurement of thousands of port channels becomes a new bottleneck. In the case of acquiring the downlink channel using the sounding reference signal (SRS) of channel reciprocity, with the explosive growth of the number of service terminals, the number of ports of SRS resources required by each terminal rises, the SRS resource overhead is large, the SRS period is also lengthened, and the degree of channel aging is deteriorated. Moreover, with the increase of frequency bands, the signal propagation loss will be greater, and the signal-to-noise ratio of SRS will also deteriorate accordingly, resulting in the accuracy of downlink channel estimation by the network device based on SRS being impaired.

[0004] In order to overcome the problems of impaired downlink channel estimation accuracy based on SRS and excessive SRS resource overhead at the elevated frequency band, the technology of beamforming SRS can be used to improve the downlink channel estimation accuracy and reduce the SRS resource overhead. In this technology, the terminal can determine the beamforming weight of the uplink SRS based on the downlink reference signal sent by the network device and the SRS port number configured by the network device, and send the SRS through the SRS port after precoding according to the beamforming weight of the SRS. The network device side can determine the downlink beam direction (downlink channel information) corresponding to each SRS port according to the SRS received from the SRS port. However, under the scheduling demand of single-user high rank (stream), the number of streams of downlink beam direction sent by the network device to the terminal increases, and if the terminal only sends SRS based on the SRS port number configured by the network device, the network device side can only obtain the downlink beam direction of the port number of streams, and cannot support the terminal demand of high rank scheduling. SUMMARY

[0005] The embodiment of the application provides a signal sending method and a communication device, which can support the requirement of SRS for beamforming and single-user high rank scheduling, and improve downlink transmission performance.

[0006] In a first aspect, a signal sending method is provided. The execution subject of the method can be a terminal device, a component or device (such as a processor, a chip, or a chip system) applied to the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device. The method comprises the following steps: receiving a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; the plurality of precodings comprising a first precoding and a second precoding, and the first precoding being different from the second precoding; sending a first channel sounding reference signal (SRS) and a second SRS, the first SRS being sent on a first SRS resource by using the first precoding, and the second SRS being sent on a second SRS resource by using the second precoding; wherein the first SRS and the second SRS are used for a network device to determine downlink channel information, and the sending period of the first SRS resource is different from that of the second SRS resource.

[0007] In the method, determining the plurality of precodings based on the first CSI-RS can be understood as determining a plurality of different or orthogonal uplink precodings of the SRSs sent based on the first CSI-RS. In this way, the first SRS resource and the second SRS resource are equivalent to being associated with the same CSI-RS.

[0008] In this way, compared with the prior art in which the number of ports of the SRS resource of the SRS sent by the terminal device on the network side is N layer , the network device can only obtain the downlink beam directions of N layer streams, and cannot support the scheduling requirement of single-user high rank. In the application, when the number of streams required by the scheduling requirement of single-user high rank is greater than N layer , the first SRS and the second SRS are sent on different periods by using different precodings, so that the network device can obtain the downlink channel information of more than N layer streams, so as to send more than N layer streams based on the downlink channel information of more than N layer streams.

[0009] For example, the number of more than N layer streams corresponding to the scheduling requirement of single-user high rank is N Rx . In the application, the network device can obtain N layerThe downlink channel information of the one stream can also be obtained by the terminal sending a first SRS and a second SRS using different precodings on different periods through two SRS resources. Rx -N layer The downlink channel information of the one stream. In this way, the number of SRS ports through which the terminal device sends SRS is still N layer streams is supported without increasing the SRS port overhead.

[0010] In a second aspect, a method for sending a signal is provided. The execution subject of the method can be a network device, a component or apparatus (such as a processor, a chip, or a chip system, etc.) applied to the network device, or a logic module or software capable of realizing all or part of the functions of the network device. The method comprises: sending a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings including a first precoding and a second precoding, and the first precoding being different from the second precoding; receiving a first channel sounding reference signal (SRS) and a second SRS, the first SRS being sent using the first precoding on a first SRS resource, and the second SRS being sent using the second precoding on a second SRS resource; determining downlink channel information based on the first SRS and the second SRS; and wherein the transmission period of the first SRS resource is different from that of the second SRS resource.

[0011] The beneficial effects of the second aspect can be seen from the description of the first aspect.

[0012] In a possible design, the priority of the first SRS resource is higher than that of the second SRS resource. That is, the priorities of the first SRS resource and the second SRS resource are different, so that, once the first SRS resource and the second SRS resource are used to send SRSs on the same time-frequency domain resource, the first SRS can be guaranteed to be sent on the first SRS resource, and the second SRS is not sent on the second SRS resource, so as to solve the problem of resource collision. Wherein, the priority of the first SRS resource being higher than that of the second SRS resource can be understood as the priority of the terminal sending the first SRS on the first SRS resource being higher than that of sending the second SRS on the second SRS resource.

[0013] In a possible design, the first SRS resource is a semi-periodic resource, and the second SRS resource is a periodic resource. If the above priority design is combined, the priority of the semi-periodic SRS resource is higher than that of the periodic SRS resource. In this way, when the time domain, frequency domain, and code domain resources used by the semi-periodic and periodic SRS resources are the same, the periodic SRS resource is not used to send SRS, and only the first SRS is sent on the semi-periodic SRS resource, so as to guarantee the use of the semi-periodic SRS resource.

[0014] In a possible design, the first SRS resource and the second SRS resource are both periodic resources. In this way, the first SRS resource does not need to be activated through signaling relative to the case where the first SRS resource is semi-periodic. In combination with the above priority design, when the SRS resources of two different priorities are configured on the same time-frequency resource and are both activated, the SRS resource of the lower priority is canceled from being sent, and the two SRS resources can be sent with SRS respectively until the next time the time-frequency resources do not overlap.

[0015] In a possible design, the transmission period of the first SRS resource is greater than the transmission period of the second SRS resource. If combined with the above priority design, the priority of the first SRS resource as a long period is greater than the priority of the second SRS resource as a relatively short period, so that the first SRS can be guaranteed to be sent on the first SRS resource of the long period.

[0016] In a possible design, the frequency hopping times of the first SRS resource and the second SRS resource are both m, the frequency hopping period of the second SRS resource is T, the frequency hopping period of the first SRS resource is kT, k and m are coprime, and k, m, and T are integers. In this way, in the case where k and m are coprime, the time domain resources of the first SRS resource for sending the first SRS and the time domain resources of the second SRS resource for sending the second SRS overlap, avoiding the first SRS occupying additional resources other than the second SRS resource and causing resource conflicts with other signals.

[0017] In a possible design, the method further includes: receiving configuration information, the configuration information being used to indicate that the priority of the first SRS resource is higher than the priority of the second SRS resource. In this way, when the first SRS resource and the second SRS resource conflict, the first SRS on the first SRS resource with the higher priority can be guaranteed to be sent.

[0018] In a third aspect, a method for sending a signal is provided. The execution subject of the method can be a terminal device, a component or apparatus (for example, a processor, a chip, or a chip system) applied to the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device. The method includes: receiving a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; and sending a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the sending of the SRS at the plurality of time instants being changed according to a preset period and belonging to the plurality of precodings, wherein the SRS sent at the plurality of time instants is used to determine downlink channel information.

[0019] The third aspect is equivalent to sending the SRS through a first SRS resource with a precoding changed at different periods.

[0020] In this way, by constraining the first SRS resource to change the precoding in a preset period at multiple time instants, in the case that the first SRS resource occupies X ports, at least the following can be achieved: the network device can obtain the downlink channel information of X streams through the SRS received at one period, and obtain the downlink channel information of another X streams through the SRS received at another period. In this way, the network device can obtain the downlink channel information or downlink beam direction or downlink precoding of 2X different streams through the first SRS resource. In this way, in downlink scheduling, scheduling with Rank=2X can be supported, and high-Rank downlink transmission can be achieved.

[0021] In a fourth aspect, a method for receiving a signal is provided. The execution subject of the method can be a network device, a component or apparatus (such as a processor, a chip, or a chip system, etc.) applied to the network device, or a logic module or software capable of realizing all or part of the functions of the network device. The method comprises: sending a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine multiple precodings; receiving a sounding reference signal (SRS) through a first SRS resource at multiple time instants, the precoding corresponding to the SRS received at each time instant being determined according to a preset period and belonging to the multiple precodings; and determining downlink channel information based on the SRS received at the multiple time instants.

[0022] The beneficial effects of the fourth aspect can be seen from the description of the third aspect.

[0023] In a possible design, the precoding corresponding to the SRS at any time instant of the multiple time instants is determined according to the serial number of the time instant and the preset period. The serial number of the time instant can also be understood as the identification of the time instant. In this way, the precoding of the SRS sent on the first SRS resource can be periodically changed.

[0024] In a possible design, the preset period is kT, T representing the frequency hopping period of the SRS; if the serial number n of any time instant and k have a remainder of 0, the precoding corresponding to the time instant is a first precoding; if the serial number n of any time instant and k have a remainder other than 0, the precoding corresponding to the time instant is a second precoding; the first precoding is different from the second precoding, k and m are coprime, m representing the frequency hopping times of the SRS, and n, k, T, and m are all integers greater than or equal to 1.

[0025] In a possible design, the precoding corresponding to the SRS at any time instant of the multiple time instants is determined according to the serial number of the time instant, the preset period, and the frequency hopping times of the SRS. In this way, the precoding of the SRS sent on the first SRS resource can be periodically changed, or changed according to a certain transformation period.

[0026] In a possible design, the preset period is JmT, m represents the frequency hopping times, and T represents the frequency hopping period of the SRS; if the serial number n at any time is smaller than m when divided by Jm, the precoding corresponding to any time is the first precoding; if the serial number n at any time is greater than or equal to m when divided by Jm, the precoding corresponding to any time is the second precoding; the first precoding is different from the second precoding, n, k, T, and m are all integers greater than or equal to 1, and J is an integer greater than or equal to 2.

[0027] In a possible design, the preset period is JmT, m represents the frequency hopping times, and T represents the frequency hopping period of the SRS; if the serial number n at any time is smaller than m when divided by Jm.

[0028] In a fifth aspect, a communication apparatus is provided, which includes: a receiving unit, configured to receive a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings including a first precoding and a second precoding, and the first precoding being different from the second precoding; and a sending unit, configured to send a first sounding reference signal (SRS) and a second SRS, the first SRS being sent on a first SRS resource using the first precoding, and the second SRS being sent on a second SRS resource using the second precoding; wherein the first SRS and the second SRS are used by a network device to determine downlink channel information, and the first SRS resource and the second SRS resource have different sending periods.

[0029] In a possible design, the receiving unit is further configured to receive configuration information, the configuration information being used to indicate that the first SRS resource has a higher priority than the second SRS resource.

[0030] In a sixth aspect, a communication apparatus is provided, which includes: a sending unit, configured to send a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings including a first precoding and a second precoding, and the first precoding being different from the second precoding; and a receiving unit, configured to receive a first sounding reference signal (SRS) and a second SRS, the first SRS being sent on a first SRS resource using the first precoding, and the second SRS being sent on a second SRS resource using the second precoding; and determine downlink channel information based on the first SRS and the second SRS; wherein the first SRS resource and the second SRS resource have different sending periods.

[0031] In a possible design, the first SRS resource has a higher priority than the second SRS resource.

[0032] In a possible design, the first SRS resource is a half-period resource, and the second SRS resource is a period resource.

[0033] In one possible design, the first SRS resource and the second SRS resource are both periodic resources.

[0034] In one possible design, the transmission period of the first SRS resource is greater than the transmission period of the second SRS resource.

[0035] In one possible design, the frequency hopping number of the first SRS resource and the second SRS resource are both m, the frequency hopping period of the second SRS resource is T, the frequency hopping period of the first SRS resource is kT, k and m are co-prime, and k, m, and T are integers.

[0036] In a seventh aspect, a communication apparatus is provided, which comprises: a receiving unit, configured to receive a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; and a transmitting unit, configured to transmit a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the SRS transmitted at each of the plurality of time instants being varied according to a preset period and belonging to the plurality of precodings; wherein the SRS transmitted at the plurality of time instants is used to determine downlink channel information.

[0037] In an eighth aspect, a communication apparatus is provided, which comprises: a transmitting unit, configured to transmit a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; a receiving unit, configured to receive a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the SRS received at each of the plurality of time instants being varied according to a preset period and belonging to the plurality of precodings; and a processing unit, configured to determine downlink channel information based on the SRS received at the plurality of time instants.

[0038] In one possible design, the precoding corresponding to the SRS at any of the plurality of time instants is determined according to the sequence number of the time instant and the preset period.

[0039] In one possible design, the preset period is kT, T representing a frequency hopping period of the SRS; if the sequence number n of any of the time instants modulo k is 0, the precoding corresponding to the time instant is a first precoding; if the sequence number n of any of the time instants modulo k is not 0, the precoding corresponding to the time instant is a second precoding; wherein the first precoding is different from the second precoding, k and m are co-prime, m representing a frequency hopping number of the SRS, and n, k, T, and m are integers greater than or equal to 1.

[0040] In one possible design, the precoding corresponding to the SRS at any of the plurality of time instants is determined according to the sequence number of the time instant, the preset period, and a frequency hopping number of the SRS.

[0041] In a possible design, the preset period is JmT, m represents the number of frequency hopping, and T represents the frequency hopping period of the SRS; if the value obtained by performing modulo operation on the serial number n at any moment and Jm is smaller than m, the precoding corresponding to any moment is the first precoding; if the value obtained by performing modulo operation on the serial number n at any moment and Jm is greater than or equal to m, the precoding corresponding to any moment is the second precoding; the first precoding is different from the second precoding, n, k, T and m are all integers greater than or equal to 1, and J is an integer greater than or equal to 2.

[0042] In a ninth aspect, a communication apparatus is provided, which includes at least one processor and a memory connected to the at least one processor. The at least one processor is configured to read and execute a program stored in the memory, so that the apparatus performs the method in the first aspect or any one of the first aspect, and / or the method in the third aspect or any one of the third aspect.

[0043] In a tenth aspect, a communication apparatus is provided, which includes at least one processor and a memory connected to the at least one processor. The at least one processor is configured to read and execute a program stored in the memory, so that the apparatus performs the method in the second aspect or any one of the second aspect, and / or the method in the fourth aspect or any one of the fourth aspect.

[0044] In an eleventh aspect, a computer readable storage medium is provided, which includes computer instructions. When the computer instructions run on an electronic device, the electronic device performs the method in the first aspect or any one of the first aspect, and / or the method in the third aspect or any one of the third aspect.

[0045] In a twelfth aspect, a computer program product is provided, which, when running on a computer or a processor, causes the computer or the processor to perform the method in the second aspect or any one of the second aspect, and / or the method in the fourth aspect or any one of the fourth aspect.

[0046] In a thirteenth aspect, a communication system is provided, which includes a first communication apparatus and a second communication apparatus. The first communication apparatus is configured to perform the method in the first aspect or any one of the first aspect, and / or the method in the third aspect or any one of the third aspect. The second communication apparatus is configured to perform the method in the second aspect or any one of the second aspect, and / or the method in the fourth aspect or any one of the fourth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0047] FIG. 1 is a schematic diagram of subcarriers occupied by a comb in different comb degrees according to an embodiment of the present application;

[0048] FIG. 2 is a schematic diagram of frequency domain resources occupied by SRS in frequency hopping transmission according to an embodiment of the present application;

[0049] FIG. 3 is a schematic diagram of an architecture of a communication system according to an embodiment of the present application;

[0050] FIG. 4 is a schematic diagram of a technology of beamforming based on antenna domain SRS and a schematic diagram of a UE acquiring a transmission weight of SRS based on CSI-RS transmitted by a base station according to an embodiment of the present application;

[0051] FIG. 5 is a schematic diagram of a method of transmitting a signal according to an embodiment of the present application;

[0052] FIG. 6 is a schematic diagram of a time domain of transmitting a first SRS and a second SRS according to an embodiment of the present application;

[0053] FIG. 7 is a schematic diagram of transmitting a first SRS and a second SRS in a frequency hopping scenario according to an embodiment of the present application;

[0054] FIG. 8 is a schematic diagram of a method of transmitting a signal according to an embodiment of the present application;

[0055] FIG. 9 is a schematic diagram of transmitting SRS on a first SRS resource in a frequency hopping scenario according to an embodiment of the present application;

[0056] FIG. 10 is a schematic diagram of transmitting SRS on a first SRS resource in a frequency hopping scenario according to an embodiment of the present application;

[0057] FIG. 11 is a schematic diagram of a structure of a communication apparatus according to an embodiment of the present application;

[0058] FIG. 12 is a schematic diagram of a structure of a communication apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0059] For the convenience of understanding, some descriptions of concepts related to embodiments of the present application are given as examples for reference. As follows.

[0060] Sounding reference signal (SRS): SRS is an uplink reference signal transmitted by a terminal device to a network device. After receiving the SRS, the network device can obtain the uplink (UL) channel of the terminal device to the network device based on the SRS signal. For example, for a time division duplexing (TDD) system, if there is channel reciprocity between the uplink and downlink channels, the downlink channel information of the terminal device can also be obtained based on the SRS-based uplink channel. After obtaining the downlink channel information of the terminal device, the network device can perform data transmission resource scheduling or precoding processing on the terminal device according to the downlink channel information.

[0061] Cyclic shift (CS): For different SRS ports, they can be transmitted on the same time-frequency resource in a code-division multiplexing manner. By multiplying the SRS sequence in the frequency domain by a phase offset factor, an equivalent time-domain response can be generated to produce a cyclic shift offset. By virtue of the feature that the maximum time delay of a channel is often limited, different SRS port code-division orthogonal can be achieved by a suitable cyclic shift offset. A suitable cyclic shift can be referred to as CS. Specifically, the cyclic shift is applied to the transmission sequence. Due to the characteristics of the transmission sequence, applying a cyclic shift to the transmission sequence is equivalent to shifting the signal in the time delay domain. When different signals are shifted differently, the multiplexing effect is achieved.

[0062] Comb: For different SRS ports, they can be transmitted on different frequency domain subcarriers in a frequency-division multiplexing manner. The comb divides the frequency domain subcarriers into multiple groups, and the frequency domain interval between the two adjacent subcarriers in each group is a fixed value. Comb offset (CO) is a way to distinguish different subcarriers in the frequency domain. Different comb offset values represent different subcarrier groups or frequency domain subcarrier positions. SRS resources achieve frequency-division multiplexing between ports by assigning different comb offset values to different SRS ports. Figure 1 shows a schematic diagram of comb occupying frequency domain subcarriers under different comb degrees. The comb is a part of subcarriers extracted at equal intervals in the frequency domain, where the interval of extraction is referred to as the comb degree K TC , radio resource control (RRC) refers to pre-configuration, and the value is usually 2, 4, 8, for example, when K TC = 2, the frequency domain can be divided into two combs for frequency-division multiplexing of two groups of SRS ports. In Figure 1, one grid represents one subcarrier, and the shaded grid is an example of subcarrier positions occupied by the comb corresponding to a comb offset value of 0 under different comb degrees.

[0063] Measurement bandwidth and frequency hopping bandwidth of SRS: The SRS measurement bandwidth is the total bandwidth through which the network device measures the channel by SRS. At each SRS sending time, the SRS resource occupied by SRS can be used to send signals on the entire measurement bandwidth, or can be used to send signals only on a part of the measurement bandwidth. When signals are sent only on a part of the measurement bandwidth, it is called that SRS is sent by frequency hopping, and the length of the part of the bandwidth sent each time is the frequency hopping bandwidth. Through multiple SRS sending times, the network device can obtain the channel corresponding to the entire SRS measurement bandwidth. FIG. 2 shows a schematic diagram of occupying frequency domain resources when SRS is sent by frequency hopping. In FIG. 2, one grid represents one sub-band (for example, it can be one resource block (RB)) in the frequency domain, the measurement bandwidth of SRS is 16 RBs, and the frequency hopping bandwidth of SRS is 4 RBs. Through 4 times of SRS sending, the measurement of the measurement bandwidth can be completed.

[0064] FIG. 3 is a schematic diagram of an architecture of a communication system 1000 to which embodiments of the present application can be applied. As shown in FIG. 3, the communication system includes a radio access network (RAN) 100, which includes at least one RAN node (e.g., 110a and 110b in FIG. 3, collectively referred to as 110), and can also include at least one terminal (e.g., 120a-120j in FIG. 3, collectively referred to as 120). The RAN 100 can also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 3). The terminals 120 are connected to the RAN nodes 110 in a wireless manner. Terminals and terminals and RAN nodes and RAN nodes can be connected to each other in a wired or wireless manner. The communication system 1000 can also include a core network 200. The RAN nodes 110 are connected to the core network 200 in a wireless or wired manner. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 can be independent and different physical devices, or can be the same physical device integrated with the logical functions of the core network devices and the logical functions of the RAN nodes. The communication system 1000 can also include the Internet 300.

[0065] The RAN 100 can be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, and a future wireless access system defined in the 3rd generation partnership project (3GPP). The RAN 100 can also include two or more different wireless access systems. The RAN 100 can also be an open RAN (O-RAN).

[0066] A RAN node, also referred to as a radio access network device, a RAN entity, or an access node, is configured to help a terminal to access a communication system through wireless means. In one application scenario, the RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5th generation (5G) mobile communication system, a base station in a future mobile communication system, or a next generation base station in a future mobile communication system. The RAN node can be a macro base station (e.g., 110a in FIG. 3), a micro base station or an indoor station (e.g., 110b in FIG. 3), or a relay node or a donor node.

[0067] In another application scenario, a terminal can access a communication system through wireless means with the help of cooperation among a plurality of RAN nodes, each of which implements part of functionalities of a base station. For example, the RAN node can be a central unit (CU), a distributed unit (DU), or a radio unit (RU). The CU here implements functionalities of a radio resource control protocol and a packet data convergence protocol (PDCP) of a base station, and can further implement a functionality of a service data adaptation protocol (SDAP). The DU implements functionalities of a radio link control layer and a medium access control (MAC) layer of a base station, and can further implement part of functionalities of a physical layer or all functionalities of the physical layer. For details of the protocol layers, refer to relevant technical specifications of 3GPP. The RU can be configured to implement functionalities of transceiving radio frequency signals. The CU and the DU can be two independent RAN nodes, or can be integrated in the same RAN node, e.g., in a baseband unit (BBU). The RU can be included in a radio frequency device, e.g., a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes, i.e., a CU-control plane and a CU-user plane.

[0068] The RAN node can have different names in different systems, for example, in an O-RAN system, the CU can be referred to as an open CU (O-CU), the DU can be referred to as an open DU (O-DU), and the RU can be referred to as an open RU (O-RU). The RAN node in the embodiments of the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node can be a server loaded with a corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form of the RAN node. For ease of description, a base station is described as an example of the RAN node in the following.

[0069] A terminal is a device with wireless transceiving function, which can send a signal to a base station or receive a signal from a base station. The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied in various scenarios, such as device-to-device (D2D) communication, vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiving function, wearable device, vehicle, airplane, ship, robot, mechanical arm, smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form of the terminal.

[0070] The base station and the terminal can be fixed in position or movable. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on an airplane, balloon and artificial satellite. The embodiments of the present application do not limit the application scenarios of the base station and the terminal.

[0071] The roles of the base station and the terminal can be relative. For example, the helicopter or the drone 120i in FIG. 3 can be configured as a mobile base station, and for the terminal 120j that accesses the wireless access network 100 through the 120i, the terminal 120i is a base station; but for the base station 110a, the 120i is a terminal, that is, the 110a and the 120i communicate through a wireless air interface protocol. Of course, the 110a and the 120i can also communicate through a base station-to-base station interface protocol, and in this case, the 120i is also a base station relative to the 110a. Therefore, the base station and the terminal can be collectively referred to as a communication device, and the 110a and the 110b in FIG. 3 can be referred to as a communication device with a base station function, and the 120a-120j in FIG. 3 can be referred to as a communication device with a terminal function.

[0072] The base station and the terminal, the base station and the base station, and the terminal and the terminal can communicate through a licensed spectrum, can communicate through an unlicensed spectrum, or can communicate through both the licensed spectrum and the unlicensed spectrum; can communicate through a spectrum below 6 gigahertz (GHz), can communicate through a spectrum above 6 GHz, or can communicate through both the spectrum below 6 GHz and the spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0073] In the embodiments of the present application, the functions of the base station can also be performed by a module (such as a chip) in the base station or by a control subsystem containing base station functions. The control subsystem containing base station functions herein can be a control center in the above-mentioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. The functions of the terminal can also be performed by a module (such as a chip or a modem) in the terminal or by a device containing terminal functions.

[0074] In the present application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried 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. In order to communicate with the base station, the terminal needs to establish a wireless connection on a cell controlled by the base station. The cell that establishes a wireless connection with the terminal is called a service cell of the terminal. When the terminal communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0075] In the embodiments of the present application, the time domain symbol can be an orthogonal frequency division multiplexing (OFDM) symbol or a discrete fourier transform-spread-OFDM (DFT-s-OFDM) symbol. If not specified, the symbol in the embodiments of the present application refers to a time domain symbol.

[0076] The present application can be applicable to a single-transmission and receiving point (single-TRP) scenario and a multi-transmission and receiving point (Multi-TRP) scenario.

[0077] The present application can be applicable to a low frequency scenario, such as a low frequency scenario in a future communication system, and a high frequency scenario in a future communication system.

[0078] In the face of new opportunities for future communication frequency bands, a larger base station array and a larger UE array have become an inevitable trend of MIMO evolution. For example, the future communication frequency band is the U6G (upper half of 6 GHz, i.e. 6425-7125 MHz) licensed spectrum officially defined by 3GPP, and the frequency band number is n104. From the base station side, compared with the common 64T (the number of base station transmit antennas is 64) deployment at 2.6 GHz, only by increasing one time vertically under the base station, the channel number can reach 256T (the number of base station transmit antennas is 256) under U6G, which can realize higher spatial resolution and improve the spectral efficiency of future massive MIMO. Similarly, for the UE side, the common 4R terminal, i.e. the terminal with 4 receive antennas, is expected to support more channel numbers 2X-4X, i.e. 8R-16R in the future, to improve the overall performance of transmission or reception.

[0079] However, while more channel numbers bring better performance, the measurement of thousands of port channels becomes a new bottleneck. Following the SRS acquisition of the downlink channel using the channel uplink-downlink reciprocity in the TDD frequency band, with the explosive growth of the number of UEs served by the base station, each UE can require 16-port SRS resources. Compared with the previous 4-port SRS resources, the port overhead is increased by 4 times, the SRS period is also lengthened by 4 times, and the channel aging degree is worsened by more than 4 times. Moreover, with the rise of the frequency band, the channel time variation will be accelerated, that is, the channel aging problem will further worsen the performance.

[0080] Meanwhile, due to the increase of the frequency band, compared with 2.6G, the channel propagation loss of U6G will be greater, and the coverage will be worse than 2.6G by about 18dB, that is, the signal-to-noise ratio of SRS is deteriorated, so that the channel estimation accuracy of the base station based on SRS is further damaged.

[0081] In order to overcome the problem of channel aging caused by the poor channel estimation accuracy based on SRS and the large port overhead of SRS resource under the U6G frequency band, a beamforming technology for SRS can be used to improve the channel estimation accuracy of SRS and reduce the port overhead of SRS resource.

[0082] As shown in (a) of FIG. 4, it is a schematic diagram of a technology of beamforming SRS based on antenna domain. The base station side 41 and the UE side 42 are both multi-antenna port devices, and the power is equally divided on each antenna of the UE side. For example, the SRS resource occupies 4 antennas, and the SRS is sent through 4 ports. However, in this technology, the energy is dispersed, there is no directivity, and N Rx SRS port resources are needed. As shown in (b) of FIG. 4, it is a schematic diagram of UE 43 acquiring the transmission weight of SRS based on the channel state information reference signal (CSI-RS) sent by the base station 44. In this technology, the transmission weight of SRS is acquired based on the CSI-RS, and the beamforming SRS (BF-SRS) is beamformed, which can converge the power to the strong flow, that is, the SRS power can be allocated to the effective strong flow, so that the energy is concentrated on the effective flow number of the channel, and only N layer SRS port resources are needed. N layer may be less than N Rx .

[0083] For the technology shown in (b) of FIG. 4, the specific steps can include the following steps.

[0084] Step one, the UE acquires the downlink channel based on the CSI-RS sent by the base station Covariance of the channel on each RB After averaging, the wideband covariance information can be obtained

[0085] Among them, N t represents the number of antennas on the base station side, N r represents the number of antennas on the UE side, N RB represents the number of RBs in the full band, represents the downlink channel acquired on the i-th RB.

[0086] Step two, the UE calculates the eigen decomposition based on the covariance information of the bandwidth to obtain the eigenvector. According to the number N of SRS ports configured by the base station layer , the eigenvectors corresponding to the largest N layer eigenvalues in the eigenvector are taken The SRS uplink beamforming weight is calculated

[0087] Step three, the UE pre-encodes the SRS based on the SRS uplink beamforming weight W srs , wherein each SRS port corresponds to 1 stream of pre-encoding, and each SRS port is time-divisionally sent to different OFDM symbols (OS).

[0088] Step four, the base station side can obtain the downlink channel information corresponding to the N layer SRS ports based on the received SRS sent by the N layer SRS ports, or can be understood as the downlink precoding weight corresponding to the N layer SRS ports, or can be understood as the downlink beam direction corresponding to the N layer SRS ports. In this way, the base station can obtain the downlink channel on a single subcarrier based on the downlink channel information In this way, the base station can send a downlink signal to the UE on a single subcarrier.

[0089] In the actual network, there will be a single-user high-Rank scheduling requirement, that is, the number of streams of the downlink signal sent by the base station to the UE is large, for example, the downlink beam direction corresponding to N Rx streams of the UE is needed. If the UE only sends SRS of N layer SRS ports through BF SRS, the base station can only obtain the downlink beam direction corresponding to N layer streams, and the base station cannot obtain the beam direction of the remaining N Rx -N layer streams. In this way, a new mechanism is needed to enable the scheduling requirement of the high-Rank user through the BF SRS.

[0090] In the embodiments of the present application, the letters indicating multiple numerical values such as N Rx and N layer may also be represented in other ways, and the present application does not limit the indication method of the numerical value.

[0091] Therefore, the embodiment of the present application provides a method for transmitting signals and a communication device. In the method, two SRS resources are allocated, and the two SRS resources are associated with the same CSI-RS, so that different precoders are obtained. The terminal device transmits SRSs by using different precoders on the two SRS resources. In this way, for the network device, the SRSs transmitted by using different precoders on each SRS port of each SRS resource can be used to obtain the downlink channel information corresponding to each SRS port of each SRS resource. For example, the number of SRS ports of one SRS resource is X, and the number of SRS ports of another SRS resource is Y. Since the terminal device transmits SRSs by using different precoders on the two SRS resources, the network device can obtain X pieces of downlink channel information by receiving the SRSs transmitted by the terminal device on one SRS resource, and can obtain Y pieces of downlink channel information by receiving the SRSs transmitted by the terminal device on another SRS resource. In this way, in downlink scheduling, the network device can support scheduling requirements of Rank=X+Y, and high-Rank downlink transmission is realized.

[0092] As shown in FIG. 5, the embodiment of the present application provides a flowchart of a method for transmitting signals. In the method, the network device can allocate two SRS resources, the transmission periods of the two SRS resources are different, and the two SRS resources can be associated with the same CSI-RS and transmit SRSs by using different precoders. For example, one SRS resource can be a half-period resource, and another SRS resource can be a period resource. The method includes the following processes.

[0093] 501. The network device transmits a first CSI-RS, the first CSI-RS is used to determine a plurality of precoders, the plurality of precoders includes a first precoder and a second precoder, and the first precoder is different from the second precoder.

[0094] Correspondingly, the terminal device receives the first CSI-RS transmitted by the network device.

[0095] In some embodiments, the precoder can be understood as an uplink precoding weight, which is used for the terminal device to transmit SRSs after beamforming of the SRSs according to the weight.

[0096] For example, the plurality of precoders can be understood as the SRS uplink beamforming weights W srs For example, N uplink beamforming weights can be obtained. The value of N can also be understood as the number of receiving antennas of the terminal device. N is an integer greater than or equal to 2.

[0097] In some embodiments, the first CSI-RS is used to determine multiple precodings, which can be understood as the multiple precodings are determined by the same CSI-RS, i.e., the first CSI-RS.

[0098] Here, the same CSI-RS, i.e., the first CSI-RS, is used to determine multiple precodings, and multiple different precodings can be calculated, or in other words, the calculated multiple precodings are orthogonal, so that the terminal device can select a first precoding and a second precoding from the multiple precodings, and the first precoding and the second precoding are different.

[0099] In some embodiments, the first CSI-RS is a non-zero-power (NZP) CSI-RS, and can also be other types of CSI-RS, which are not limited in the present application.

[0100] In some embodiments, the first precoding and the second precoding are associated with two SRS resources configured by the present application, or in other words, the two SRS resources transmit SRSs using different precodings, and the two SRS resources are associated with the same first CSI-RS.

[0101] In the present application, the first SRS resource can be associated with the first precoding, and the second SRS resource can be associated with the second precoding.

[0102] 502、The terminal device transmits a first SRS and a second SRS, the first SRS is transmitted using the first precoding on the first SRS resource, and the second SRS is transmitted using the second precoding on the second SRS resource.

[0103] Correspondingly, the network device receives the first SRS and the second SRS transmitted by the terminal device.

[0104] In the embodiments of the present application, the first SRS resource can be understood as a first SRS resource set, and the second SRS resource can be understood as a second SRS resource set.

[0105] In the embodiments of the present application, the SRS resource can include at least one of a port (SRS port) for transmitting SRS by the terminal device, a time domain resource, or a frequency domain resource.

[0106] In some embodiments, the SRS port occupied by the first SRS resource and the SRS port occupied by the second SRS resource are the same or different. For example, the terminal device has multiple transmission ports, and the first SRS resource and the second SRS resource each occupy 2 transmission ports as SRS ports, and the 2 transmission ports are port 1 and port 2, or the first SRS resource occupies port 1 and port 2, and the second SRS resource occupies port 3 and port 4.

[0107] The number of SRS ports occupied by the first SRS resource and the number of SRS ports occupied by the second SRS resource can be the same or different.

[0108] For example, when the terminal device obtains N uplink precoding weights based on the first CRI-RS measurement, N SRS uplink beamforming weights are obtained, and N precodings can be obtained. Assuming that the first SRS resource occupies X SRS ports and the second SRS resource occupies Y ports, the present application can select X precodings from the N precodings according to the number of SRS ports occupied by the first SRS resource, and select Y precodings from the N precodings according to the number of SRS ports occupied by the second SRS resource, wherein the Y precodings are different from the X precodings. X and Y are integers greater than or equal to 1.

[0109] In this way, when the terminal device determines the X precodings corresponding to the first SRS resource, the terminal device can perform beamforming on the X SRS ports according to the X precodings and then transmit the first SRS, and when the terminal device determines the Y precodings corresponding to the second SRS resource, the terminal device can perform beamforming on the Y SRS ports according to the Y precodings and then transmit the second SRS.

[0110] For example, assuming that X = Y = 2, the terminal device obtains N uplink precoding weights based on the received first CSI-RS The terminal device can select W srs , W , and W to calculate 2 precodings as the precodings corresponding to the 2 SRS ports of the terminal device transmitting the first SRS on the first SRS resource. The terminal device selects W srs , W , and W to calculate 2 precodings as the precodings corresponding to the 2 SRS ports of the terminal device transmitting the second SRS on the second SRS resource.

[0111] In some embodiments, the bandwidth occupied by the first SRS resource and the second SRS resource in the frequency domain can be the full-band bandwidth or the frequency hopping bandwidth, and the present application does not make any limitation.

[0112] In some embodiments, the first SRS and the second SRS are used by the network device to determine the downlink channel information, and the transmission period of the first SRS resource and the second SRS resource is different.

[0113] The transmission period of the first SRS resource and the second SRS resource is different, which can be understood as that the period of the terminal device transmitting the first SRS on the first SRS resource is different from the period of the terminal device transmitting the second SRS on the second SRS resource. That is, the period length of the first SRS resource and the second SRS resource is different.

[0114] In this way, in the case that the transmission period of the first SRS resource and the second SRS resource is different, the terminal device can transmit the first SRS on the first SRS resource and the second SRS on the second SRS resource, respectively. Correspondingly, the network device can not only receive the first SRS, but also receive the second SRS.

[0115] In some embodiments, the first SRS resource and the second SRS resource are both beamforming (BF)-SRS resources, that is, the SRS resources can be used to transmit SRS after beamforming based on precoding.

[0116] In some embodiments, different SRS ports in the first SRS resource and the second SRS resource can be transmitted on different frequency domain subcarriers through frequency division multiplexing. For example, different SRS ports can transmit SRS under different comb degrees as described above.

[0117] 503、The network device determines downlink channel information based on the first SRS and the second SRS.

[0118] For the network device, in the case that the first SRS resource occupies X SRS ports and the second SRS resource occupies Y SRS ports, the network device can obtain X stream downlink channel information by receiving the first SRS and Y stream downlink channel information by receiving the second SRS, and the network device can obtain X+Y different stream downlink channel information. In this way, the network device can support Rank=X+Y scheduling requirements in downlink scheduling, that is, the network device can transmit X+Y different downlink channel information streams to the terminal device to realize high Rank downlink transmission.

[0119] The X+Y different downlink channel information can also be understood as X+Y different stream downlink beam directions. This is because the precoding of the X+Y SRS ports transmitting SRS is different, and the network device can obtain X+Y downlink precoding by demodulating the first SRS and the second SRS when receiving the first SRS and the second SRS, so as to transmit X+Y different downlink beam direction streams after downlink beamforming according to the X+Y downlink precoding.

[0120] In some embodiments, X+Y is less than or equal to N.

[0121] Thus, compared to the existing solution, the number of ports configured on the network side for sending SRS on the terminal device is N. layer In this case, the network device can only obtain the corresponding N. layer The current downlink beam direction of a single stream cannot support the high-rank scheduling requirements of a single user. This application enables the number of streams in the downlink beam direction required for high-rank scheduling of a single user to be greater than N. layer At the same time, two SRS resources are used to send the first SRS and the second SRS in different periods and with different precoding, so that the network device can obtain more than N layer Downlink channel information of a number of streams, so as to be based on more than N layer More than N downlink channel information transmissions layer A number of flows. For example, a single user with a high-rank scheduling requirement corresponds to more than N. layer The number of flows is N. Rx This application can obtain N units. layer The downlink channel information of each stream can also be obtained as N. Rx -N layer The downlink channel information for each stream. Thus, while maintaining the number of SRS ports used by the terminal device to transmit SRS at N. layer In some cases, or in other words, it can support the scheduling needs of a single user with a high rank without increasing the SRS port overhead.

[0122] As described above, in this application, the terminal device can transmit the first SRS and the second SRS through full-band bandwidth, or through frequency hopping bandwidth. Below, we first provide an exemplary implementation of transmitting the first SRS and the second SRS through full-band bandwidth, as illustrated in the examples of Method 1 and Method 2 below.

[0123] Method 1: The first SRS resource is a half-cycle resource, and the second SRS resource is a cycle resource.

[0124] Among them, the half-cycle resource can be understood as the first SRS resource that needs to be activated when signaling is triggered and then used to send signals.

[0125] In some embodiments, the method further includes: a terminal device receiving indication information, the indication information indicating a first SRS resource and a second SRS resource, wherein the first SRS resource is a half-cycle resource and the second SRS resource is a periodic resource. Correspondingly, a network device sends the indication information.

[0126] Then, the terminal device can perform the above steps 501 to 503 according to the configuration information and the network device.

[0127] In some embodiments, the priority of the first SRS resource is higher than the priority of the second SRS resource.

[0128] In some embodiments, the method further includes: a terminal device receiving configuration information, the configuration information indicating that the priority of a first SRS resource is higher than the priority of a second SRS resource. Correspondingly, a network device sends the configuration information.

[0129] For example, the aforementioned indication and configuration information may be RRC signaling.

[0130] This is because, when transmitting the first SRS and the second SRS periodically based on the first SRS resource and the second SRS resource, if the time domain, frequency domain, and code domain resources in the first SRS resource and the second SRS resource are the same, the first SRS is transmitted at the position of the first SRS resource and the second SRS resource, that is, the first SRS is transmitted on the first SRS resource of half a period and the second SRS is not transmitted, so as to ensure the use of the first SRS resource of half a period.

[0131] For example, Figure 6 shows a time-domain schematic diagram of transmitting the first SRS and the second SRS. Assume that the terminal device calculates N different feature vectors based on the first CSI-RS, denoted as U1, U2, ..., U... N The terminal device can calculate N uplink precoding weights based on these N different feature vectors. N uplink precoding weights W srs This can be understood as N SRS beamforming weights or SRS uplink precoding. The terminal device can select two weights from the N weights based on the number of ports in the first SRS resource (X=2). and As the first precoding, and based on the number of ports Y=2 of the second SRS resource, two additional weights are selected from N. and As a second precoder.

[0132] Alternatively, when calculating the uplink precoding based on the feature vectors, the terminal device can directly select two feature vectors U1 and U2 from N feature vectors based on the number of ports in the first SRS resource to calculate two uplink precoding weights. and As the first precoding, and by selecting two feature vectors U3 and U4 from N feature vectors based on the number of ports in the second SRS resource, two uplink precoding weights are calculated. and As a second precoder.

[0133] Referring to Figure 6, in the time domain, the time or opportunity n when the UE sends the SRS to the gNB SRSThe identity of the first SRS resource can be exemplified as 0, 1, …, 5, …, i.e., n SRS = 0, n SRS = 1, …, n SRS = 5, …, the first SRS resource is a semi-periodic resource, and the transmission period of the first SRS resource occupies two transmission time points (transmission opportunities), for example, the first SRS resource in a period can occupy n SRS = 0 and n SRS = 1 transmission time points, and the first precoding is used when the first SRS is transmitted and In the next period, n SRS = 3 and n SRS = 4 transmission time points can be occupied, and the first precoding is still used when the first SRS is transmitted and The second SRS resource is a periodic resource, and the transmission period of the second SRS resource occupies one transmission time point, for example, the second SRS resource in a period can occupy n SRS = 2 transmission time point, and the second precoding is used when the second SRS is transmitted and In the next period, n SRS = 5 transmission time point can be occupied, and the second precoding is used when the second SRS is transmitted and

[0134] The SRS ports occupied by the first SRS resource and the second SRS resource exemplified in FIG. 6 are port 0 and port 1, which is only an example, and the SRS ports occupied by the first SRS resource and the second SRS resource can also be different.

[0135] When the network device receives the first SRS transmitted through the first SRS resource in a period and the second SRS transmitted through the second SRS resource in a period, because the precodings of the first SRS and the second SRS are different, the network device can obtain the downlink channel information of 4 different streams, i.e., the downlink precodings of 4 different streams, according to the received first SRS and second SRS, and transmit the downlink signal after downlink beamforming based on the downlink precodings of the 4 different streams.

[0136] For example, when the network device receives the first SRS transmitted at time points 0 and 1, the network device can first obtain the downlink channel information of 2 different streams based on the first SRS received from the 2 time points. When the network device receives the second SRS transmitted at time point 3, the network device can obtain the downlink channel information of another 2 different streams based on the second SRS received from time point 3.

[0137] If the time domain, frequency domain and code domain resources occupied by the first SRS resource and the second SRS resource are the same, for example, in n SRS = 2, a resource conflict occurs at this sending time, considering that the first SRS resource is a half-period resource and has a higher priority, the terminal device sends the first SRS at n SRS = 2 and does not send the second SRS, so as to ensure the use of the half-period first SRS resource.

[0138] In mode two, the first SRS resource and the second SRS resource are both periodic resources. The priority of the first SRS resource is higher than the priority of the second SRS resource.

[0139] Similar to mode one, the terminal device can also acquire the first SRS resource and the second SRS resource, and the priority information or priority parameter of the first SRS resource and the second SRS resource by receiving the indication information and the configuration information.

[0140] In some embodiments, in mode two, the priority parameter of the first SRS resource and the priority parameter of the second SRS resource can be configured by the configuration information, or can be implicitly indicated by the period of the SRS resource.

[0141] In the case of implicitly indicating the priority parameter of the SRS resource by the period of the SRS resource, in some embodiments, the sending period of the first SRS resource is greater than the sending period of the second SRS resource. The priority of the first SRS resource is higher than the priority of the second SRS resource. That is, the priority of the SRS resource with a long period is higher than the priority of the SRS resource with a short period. In this way, when the time domain, frequency domain and code domain resources occupied by the first SRS resource and the second SRS resource are the same, considering that the frequency of sending the second SRS on the second SRS resource is higher when the priority of the second SRS resource is higher, the first SRS can be ensured to be sent on the first SRS resource with a long period.

[0142] The example of sending the first SRS and the second SRS in mode two can refer to the above exemplary description of FIG. 6. The difference is that in mode two, the first SRS resource does not need to be activated by signaling, for example, the first SRS resource does not need to be activated by a medium access control control element (MAC CE), which can save signaling overhead. When the first SRS resource and the second SRS resource with two different priorities are both activated in the same time domain, frequency domain and code domain resources, the SRS resource with a lower priority is canceled, that is, the terminal does not send the second SRS on the second SRS resource.

[0143] The following exemplary embodiments of transmitting the first SRS and the second SRS through the frequency hopping bandwidth are given, and specific examples can be seen in the following mode three and mode four.

[0144] Mode three, the first SRS resource is a semi-periodic resource, and the second SRS resource is a periodic resource. Both the first SRS resource and the second SRS resource are frequency hopping resources.

[0145] Mode one can be understood as a mode of transmitting the first SRS and the second SRS on the full-band bandwidth, and mode three can be understood as a mode of transmitting the first SRS and the second SRS by adding a frequency hopping scenario on the basis of mode one.

[0146] In mode three, when the first SRS resource is used to transmit the first SRS in the frequency domain, each transmission time or occasion of the first SRS resource occupies part of the bandwidth in the full band, and when the second SRS resource is used to transmit the second SRS in the frequency domain, each transmission time or occasion of the second SRS resource occupies part of the bandwidth in the full band. Therefore, in the case that the first SRS resource or the second SRS resource includes time domain resources and frequency domain resources, the frequency domain resources include the part of the bandwidth resources occupied by each transmission time or occasion, for example, including the RB information occupied by each transmission time or occasion in the full band.

[0147] In some embodiments, the first SRS resource and the second SRS resource are both BF-SRS resources, that is, the first SRS transmitted on the first SRS resource and the second SRS transmitted on the second SRS resource are both BF-SRS.

[0148] Similar to mode one, in mode three, the first SRS resource and the second SRS resource are both associated with the first CSI-RS to determine a plurality of precodings based on the first CSI-RS, a first precoding corresponding to the first SRS resource, and a second precoding corresponding to the second SRS resource. And the first precoding and the second precoding are different.

[0149] In some embodiments, the frequency hopping times of the first SRS resource and the second SRS resource are the same, and the frequency hopping periods of the two SRS resources are constrained through the periodicity.

[0150] In some embodiments, the frequency hopping times of the first SRS resource and the second SRS resource are both m, the frequency hopping period of the second SRS resource is T, and the frequency hopping period of the first SRS resource is kT, k and m are coprime, and km and T are integers.

[0151] In this way, for the first SRS resource, when the terminal device transmits the first SRS on the first SRS resource, the terminal device scans the full band with a period of mkT, that is, the period of completing the SRS transmission of the full band is mkT.

[0152] For the second SRS resource, the terminal device scans the entire band in a period of mT when the terminal device transmits the second SRS on the second SRS resource.

[0153] The application stipulates that k and m are coprime, so as to ensure that the transmission time of the first SRS and the transmission time of the second SRS overlap in the frequency hopping scenario, or in other words, to make the first SRS resource and the second SRS resource overlap, and the overlapping resource ensures that the first SRS is transmitted on the first SRS resource in a half period, which can ensure that the entire bandwidth is scanned on the first SRS resource, and can also avoid occupying additional resources other than the second SRS resource when the first SRS is transmitted, thereby avoiding the problem of resource conflict between the first SRS resource and other signals.

[0154] In some embodiments, when k and m are coprime, k is m+1 or m-1.

[0155] For example, as shown in FIG. 7, it is a schematic diagram of transmitting the first SRS and the second SRS in a frequency hopping scenario. In the case where m=4, k=m+1=5, the first SRS resource and the second SRS resource occupy 2 SRS ports, the first precoding is and the second precoding is and

[0156] Referring to FIG. 7, the frequency hopping period T of the second SRS resource can be understood as the time length between the starting time (ending time) of transmitting the second SRS by the terminal device once and the starting time (ending time) of transmitting the second SRS after the next frequency hopping. The frequency hopping period kT=(m+1)T=5T of the first SRS resource can be understood as the time length between the starting time (ending time) of transmitting the first SRS by the terminal device once and the starting time (ending time) of transmitting the first SRS after the next frequency hopping. The first SRS resource and the second SRS resource both need 4 times of frequency hopping to scan the entire bandwidth. For the second SRS resource, the entire bandwidth can be scanned by 4 times of continuous frequency hopping in the frequency domain, that is, 4 times of transmitting the second SRS on the frequency domain. For the first SRS resource, the entire bandwidth can be scanned by 4 times of non-continuous frequency hopping, that is, transmitting the second SRS on every 4 times of frequency domain and transmitting the first SRS once.

[0157] ​For example, referring to FIG. 7, in the case that k and m are coprime, at time 0, the first SRS resource of a half period is activated by signaling, and the second SRS resource is also in an activated state, the first SRS resource and the second SRS resource collide, that is, the time-frequency domain resources overlap, and occupy the first RB in the full bandwidth, but considering that the first SRS resource is a half-period resource, at time 0, the first SRS is selected to be transmitted on the 2 SRS ports of the first SRS resource, the second SRS is not transmitted on the 2 ports of the second SRS resource, and the precoding of the first SRS transmitted on the first SRS resource is and At times 1-4, by 4 times of continuous frequency hopping, 4 times of second SRS are time-divisionally transmitted on the second SRS resource on 4 continuous partial bandwidths (for example, the first RB to the fourth RB), and the precoding of the second SRS transmitted on the second SRS resource is and Then, at time 5, the first SRS resource of a half period is activated by signaling, and the second SRS resource is also in an activated state, the first SRS resource after frequency hopping and the second SRS resource collide again, the terminal device still selects to transmit the first SRS on the 2 SRS ports of the first SRS resource (for example, occupying the second RB in the full bandwidth), and does not transmit the second SRS on the 2 ports of the second SRS resource. In this way, at time 10 and time 15, when the first SRS resource after frequency hopping and the second SRS resource collide again, the terminal device selects to transmit the first SRS on the 2 SRS ports of the first SRS resource, and does not transmit the second SRS on the 2 ports of the second SRS resource, so that the period mkT of scanning the full bandwidth on the first SRS resource is 20T.

[0158] In this way, for the network device, the second SRS transmitted by the terminal device on the SRS port occupied by the second SRS resource, that is, the second SRS transmitted by 4 times of frequency hopping, can be used to determine the downlink channel information of 2 different streams, that is, the downlink precoding or the downlink beam direction of 2 different streams. In addition, the first SRS transmitted by the terminal device on the SRS port occupied by the first SRS resource, that is, the first SRS transmitted by 4 times of frequency hopping, can be used to determine the downlink channel information of another 2 different streams, that is, the downlink precoding or the downlink beam direction of another 2 different streams. In this way, in the case that the terminal device occupies 2 SRS ports, the network device can obtain the downlink beam direction of 4 streams, and can support transmitting a high-Rank downlink signal of 4 different streams to the terminal device.

[0159] Mode four, the first SRS resource is a periodic resource, and the second SRS resource is also a periodic resource. The first SRS resource and the second SRS resource are both frequency hopping resources.

[0160] Method 2 can be understood as transmitting the first SRS and the second SRS over the full bandwidth. Method 4 can be understood as adding a frequency hopping scenario to Method 2 to transmit the first SRS and the second SRS.

[0161] In some embodiments, both the first SRS resource and the second SRS resource are BF-SRS resources, that is, the first SRS transmitted on the first SRS resource and the second SRS transmitted on the second SRS resource are both BF-SRS.

[0162] Similar to Method 2, in Method 4, both the first SRS resource and the second SRS resource are associated with the first CSI-RS. Multiple precodes calculated based on the first CSI-RS are used to determine the first precode corresponding to the first SRS resource and the second precode corresponding to the second SRS resource. Furthermore, the first precode and the second precode are different.

[0163] In Method 4, additional priority parameters can be introduced through configuration information to configure the priority of the first SRS resource to be higher than that of the second SRS resource. Additionally, indication information can be used to indicate that the transmission period of the first SRS resource is longer than that of the second SRS resource. Alternatively, the transmission period of the SRS resource can implicitly indicate that when the transmission period of the first SRS resource is longer than that of the second SRS resource, the priority of the first SRS resource is higher than that of the second SRS resource; that is, the longer-period SRS resource has a higher priority.

[0164] In some embodiments, the first SRS resource and the second SRS resource have the same number of frequency hopping operations, and the frequency hopping period of these two SRS resources in the frequency hopping scenario is constrained by a period.

[0165] In Method 4, similar to Method 3, the frequency hopping counts of both the first SRS resource and the second SRS resource are m, the frequency hopping period of the second SRS resource is T, and the frequency hopping period of the first SRS resource is kT. In this case, k and m are coprime, and k, m, and T are all integers. See Figure 7 above for a specific example. Method 4 can achieve similar beneficial effects to Method 3. The difference is that in Method 4, the first SRS resource is a periodic resource, and activation of the first SRS resource does not require signaling triggering, thus saving signaling overhead.

[0166] In the above embodiments, it can be understood that the network device allocates two SRS resources to the terminal device, so that the terminal device transmits SRSs on the two SRS resources by using different precodings. In the present application, the network device can also allocate more than two SRS resources to the terminal device, and transmit SRSs on the more than two SRS resources by using different precodings. In this way, the network device can obtain the downlink channel information of more than N streams occupied by each SRS resource, and realize high-Rank downlink transmission.

[0167] In some embodiments of the present application, the network device can also allocate one SRS resource to the terminal device, and transmit SRSs on the SRS resource by frequency hopping. When transmitting SRSs on the one SRS resource, the precoding of the transmitted SRSs is transformed, for example, periodically transformed. In this way, the network device can also obtain the downlink channel information of multiple different streams by transmitting SRSs on the one SRS resource by using different precodings, to support the downlink scheduling requirement of high-Rank requirement. Here, the number of the downlink channel information of the different streams is more than the number of SRS ports occupied by the one SRS resource.

[0168] Based on this, as shown in FIG. 8, the present application provides a method flow diagram for transmitting signals. The method can transform the transmission behavior of the SRS ports occupied by the allocated SRS resource over time, that is, transmit SRSs by using different precodings at different transmission time instants of SRSs according to a preset period. The method includes the following flows.

[0169] 801. The network device transmits a first CSI-RS, and the first CSI-RS is used to determine multiple precodings.

[0170] Correspondingly, the terminal device receives the first CSI-RS transmitted by the network device.

[0171] The implementation of step 801 can refer to the description in step 501 above.

[0172] 802. The terminal device transmits SRSs on the first SRS resource at multiple time instants, and the corresponding precoding of the SRSs transmitted at the multiple time instants is changed according to a preset period, and all belong to the multiple precodings.

[0173] That is, even if the terminal device only occupies the first SRS resource to transmit SRSs, the precoding of the time instant of transmitting SRSs can be periodically transformed. For example, in a frequency hopping scenario, the terminal device transmits SRSs by using a first precoding at some time instants, and transmits SRSs by using a second precoding at another time instants. In this way, even if the first SRS resource occupies N layerThe network device can still calculate the downlink channel information of different streams based on the received SRSs transmitted with different precoding, and the number of the downlink channel information of different streams is greater than the number N of SRS ports occupied by the first SRS resource layer In this way, the network device can support sending downlink signals to terminal devices with high Rank requirements.

[0174] 803. The network device determines the downlink channel information based on the SRSs received at the multiple time instants.

[0175] That is, the SRSs transmitted at the multiple time instants are used to determine the downlink channel information.

[0176] For example, in the case where the first SRS resource occupies 2 SRS ports, in a frequency hopping scenario, if the terminal device transmits SRSs with two different precodings in the process of transmitting SRSs by frequency hopping, the network device can obtain 4 downlink channel information of different streams based on the SRSs transmitted with each precoding received on the full band, that is, Rank=4 scheduling can be supported in downlink scheduling.

[0177] The following exemplary embodiments are given for transmitting SRSs on an allocated SRS resource, i.e., the first SRS resource, by frequency hopping bandwidth, and specific reference can be made to the following Mode Five and Mode Six examples.

[0178] Mode Five, in step 802, the precoding corresponding to the SRS at any time instant of the multiple time instants is determined according to the sequence number of the any time instant and the preset period.

[0179] The sequence number of the time instant can be used to indicate different transmission time instants or transmission occasions. In a frequency hopping scenario, different time instants can be understood as different symbols in a time slot.

[0180] That is, when transmitting SRSs on the first SRS resource by frequency hopping, the precoding used at the current time instant can be determined by the sequence number or identifier of the current time instant and the preset period of the transformed precoding. For example, when the frequency hopping number is 4, the precoding can be transformed once after completing SRS transmission on the full band every 4 times of frequency hopping. In this way, it is equivalent to transmitting SRSs with 2 precodings in a frequency hopping scenario within a preset period.

[0181] In some embodiments, the preset period is kT, and T represents the frequency hopping period of the SRS;

[0182] If the sequence number n of the any time instant and the value obtained by taking k modulo are 0, the precoding corresponding to the any time instant is the first precoding;

[0183] If the value of the sequence number n at any moment and the k modulo is not 0, the precoding corresponding to the moment is the second precoding.

[0184] The first precoding is different from the second precoding, the k and the m are co-prime, the m represents the frequency hopping number of the SRS, and the n, the k, the T and the m are all integers greater than or equal to 1.

[0185] Here, the sequence number n and the k modulo can be represented as n%k or mod(n, k).

[0186] That is, when n satisfies n%k = 0, the precoding corresponding to the moment of the sequence number n is the first precoding; when n satisfies n%k ≠ 0, the precoding corresponding to the moment of the sequence number n is the second precoding.

[0187] In some embodiments, when the k and the m are co-prime, the k is m+1 or m-1.

[0188] In some embodiments, the above-mentioned way of determining the precoding through the relationship between n and k can be realized by pre-configuration of the network device to the terminal device, or can be realized by protocol indication.

[0189] For example, as shown in FIG. 9, it is a schematic diagram of transmitting SRS on the first SRS resource in a frequency hopping scenario, and the first SRS resource occupies 2 SRS ports.

[0190] Referring to FIG. 9, the frequency hopping number m is 4, the frequency hopping period of transmitting SRS by using the first precoding is T, the frequency hopping period of transmitting SRS by using the second precoding is kT = (m+1)T = 5T, that is, k = 5. In this example, the preset period is 5T. In the case that the sequence number n at the moment is denoted as moment n, the following conditions are met:

[0191] When the sequence number n at the moment is 0, n%k = 0%5 = 0, the first RB in the full-band bandwidth is occupied by transmitting SRS at moment 0, and the first precoding is used by the terminal device to transmit SRS on the first RB, for example, the first precoding used by the 2 SRS ports is and

[0192] When the sequence number n at the moment is 1, n%k = 1%5 = 1, the second RB in the full-band bandwidth is occupied by transmitting SRS at moment 1, and the second precoding is used by the terminal device to transmit SRS on the second RB, for example, the second precoding used by the 2 SRS ports is and

[0193] When the sequence number n of the time instant is 2, n%k=2%5=2, the third RB in the full-band bandwidth is occupied by the SRS sent at the time instant 2, and the second precoding is used by the terminal device to send the SRS on the third RB, that is, and

[0194] When the sequence number n of the time instant is 3, n%k=3%5=3, the fourth RB in the full-band bandwidth is occupied by the SRS sent at the time instant 3, and the second precoding is used by the terminal device to send the SRS on the fourth RB, that is, and

[0195] When the sequence number n of the time instant is 4, n%k=4%5=4, the first RB in the full-band bandwidth is occupied by the SRS sent at the time instant 4, and the second precoding is used by the terminal device to send the SRS on the first RB, that is, and

[0196] When the sequence number n of the time instant is 5, n%k=5%5=0, the second RB in the full-band bandwidth is occupied by the SRS sent at the time instant 5, and the first precoding is used by the terminal device to send the SRS on the second RB, that is, and

[0197] In this way, the time instants 6-9 and 11-14 shown in FIG. 9 can all use the second precoding, and the time instants 10 and 15 can all use the first precoding. This is equivalent to changing the precoding once after every 4 frequency hopping times.

[0198] In this way, by constraining the first SRS resource to use the preset periodic precoding at multiple time instants, in the case where the first SRS resource occupies X ports, the network device can obtain the downlink channel information of 2X different streams or downlink beam directions or downlink precodings through the SRS received at the time instant group 1 (for example, time instants 1-4) and the SRS received at the time instant group 2 (for example, time instants 0, 5, 10, and 15). In this way, in the downlink scheduling, Rank=2X scheduling can be supported, and high-Rank downlink transmission can be implemented.

[0199] In the sixth mode, the precoding corresponding to the SRS at any time instant in the plurality of time instants is determined according to the sequence number of the time instant, a preset period, and the frequency hopping number of the SRS.

[0200] Similar to the fifth mode, the sequence number of the time instant can be used to indicate different sending time or sending opportunity. In the frequency hopping scenario, different time instants can be understood as different symbols in a time slot.

[0201] That is, when the SRS is sent on the first SRS resource in the frequency hopping mode, the precoding used in the current time instant can be determined by the sequence number or the identifier of the current time instant, the preset period of the transform precoding, and the frequency hopping number. For example, the first precoding can be used to complete a full-band scan on the first SRS resource by the frequency hopping mode, that is, to complete a full-band SRS transmission. Then, the second precoding can be used to complete multiple full-band scans on the first SRS resource by the frequency hopping mode, that is, to complete multiple full-band SRS transmissions. Then, the first precoding can be used to complete a full-band scan on the first SRS resource by the frequency hopping mode, that is, to complete a full-band SRS transmission. And so on.

[0202] In some embodiments, the preset period is JmT, where m represents the frequency hopping number, and T represents the frequency hopping period of the SRS.

[0203] If the sequence number n of any time instant is less than m when divided by Jm, the precoding corresponding to the time instant is the first precoding.

[0204] If the sequence number n of any time instant is greater than or equal to m when divided by Jm, the precoding corresponding to the time instant is the second precoding.

[0205] where the first precoding is different from the second precoding, n, k, T, and m are all integers greater than or equal to 1, and J is an integer greater than or equal to 2.

[0206] That is, when n satisfies n%Jm < m, the precoding corresponding to the time instant of the sequence number n is the first precoding; when n satisfies n%Jm ≥ m, the precoding corresponding to the time instant of the sequence number n is the second precoding.

[0207] In some embodiments, the above-mentioned way of determining the precoding through the relationship between n and k can be realized by pre-configuration of the network device to the terminal device, or by protocol indication.

[0208] For example, as shown in FIG. 10, it is a schematic diagram of sending SRS on the first SRS resource in a frequency hopping scenario, and the first SRS resource occupies 2 SRS ports.

[0209] Referring to FIG. 10, the frequency hopping number m is 4, the frequency hopping period of sending SRS by the first precoding is T, the frequency hopping period of sending SRS by the second precoding is also T, and the preset period of the transform precoding is JmT = 4mT = 16T. In the case that the sequence number n of the time instant is denoted as time instant n:

[0210] When the sequence number n of the time instant is 0, n%Jm=0%16=0<4, the SRS sent at time 0 occupies the first RB in the full-band bandwidth, and the terminal device sends the SRS on the first RB by using the first precoding, for example, the first precoding used by the two SRS ports is and

[0211] When the sequence number n of the time instant is 1, n%Jm=1%16=1<4, the SRS sent at time 1 occupies the second RB in the full-band bandwidth, and the terminal device sends the SRS on the second RB by using the first precoding, that is, and

[0212] When the sequence number n of the time instant is 2, n%Jm=2%16=2<4, the SRS sent at time 2 occupies the third RB in the full-band bandwidth, and the terminal device sends the SRS on the third RB by using the first precoding, that is, and

[0213] When the sequence number n of the time instant is 3, n%Jm=3%16=3<4, the SRS sent at time 3 occupies the fourth RB in the full-band bandwidth, and the terminal device sends the SRS on the fourth RB by using the first precoding, that is, and

[0214] When the sequence number n of the time instant is 4, n%Jm=4%16=4, the SRS sent at time 0 occupies the first RB in the full-band bandwidth, and the terminal device sends the SRS on the first RB by using the second precoding, for example, the second precoding used by the two SRS ports is and

[0215] When the sequence number n of the time instant is 5, n%Jm=5%16=5>4, the SRS sent at time 1 occupies the second RB in the full-band bandwidth, and the terminal device sends the SRS on the second RB by using the second precoding, that is, and

[0216] When the sequence number n of the time instant is 6, n%Jm=6%16=6>4, the SRS sent at time 2 occupies the third RB in the full-band bandwidth, and the terminal device sends the SRS on the third RB by using the second precoding, that is, and

[0217] At the time point n=7, n%Jm=7%16=7>4, the time point 3 sends SRS occupying the fourth RB in the full-band bandwidth, and the terminal device sends SRS on the fourth RB using the second precoding, that is, and

[0218] In this way, the time points 8-11 and the time points 12-15 shown in FIG. 10 can all use the first precoding, and the time points 16-19 can all use the second precoding. This is equivalent to using the first precoding to complete one full-band scan, then using the second precoding to complete three full-band scans, and then using the first precoding to complete one full-band scan.

[0219] Similar to the fifth mode, by constraining the first SRS resource to use the preset periodic transformation precoding at multiple time points, in the case where the first SRS resource occupies X ports, the network device can obtain the downlink channel information of X streams through the SRS received at time group 1 (for example, time points 0-3), and obtain the downlink channel information of another X streams through the SRS received at time group 2 (for example, time points 4-7 or time points 8-11 or time points 12-15). In this way, the network device can obtain the downlink channel information or downlink beam direction or downlink precoding of 2X different streams through the first SRS resource. In this way, in the downlink scheduling, Rank=2X scheduling can be supported, and high-Rank downlink transmission can be realized.

[0220] It can be understood that, in order to realize the functions in the above embodiments, the network device and the terminal include corresponding hardware structures and / or software modules for executing various functions. Those skilled in the art should easily realize that, in combination with the units and method steps of the examples described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0221] FIGS. 11 and 12 are structural schematic diagrams of possible communication apparatuses provided by the embodiments of the present application. These communication apparatuses can be used to realize the functions of the terminal or the network device in the above method embodiments, and thus can also realize the beneficial effects possessed by the above method embodiments. In the embodiments of the present application, the communication apparatus can be the terminal 120 as shown in FIG. 3, or the base station 110 as shown in FIG. 3, or a module (such as a chip) applied to the terminal or the base station.

[0222] As shown in FIG. 11, the communication apparatus 1100 includes a processing unit 1110 and a transceiver unit 1120. The communication apparatus 1100 is used to realize the functions of the terminal or the network device in the above method embodiments shown in FIGS. 5 and / or 8.

[0223] When the communication apparatus 1100 is used to implement the function of the terminal in the method embodiment shown in FIG. 5, the transceiver 1120 is configured to receive the first CSI-RS; transmit the first SRS and the second SRS, the first SRS being transmitted on the first SRS resource using the first precoding, and the second SRS being transmitted on the second SRS resource using the second precoding; and the processing unit 1110 is configured to determine the plurality of precodings based on the first CSI-RS.

[0224] When the communication apparatus 1100 is used to implement the function of the network device in the method embodiment shown in FIG. 5, the transceiver 1120 is configured to transmit the first CSI-RS; receive the first SRS and the second SRS; and the processing unit 1110 is configured to determine the downlink channel information based on the first SRS and the second SRS.

[0225] When the communication apparatus 1100 is used to implement the function of the terminal in the method embodiment shown in FIG. 8, the transceiver 1120 is configured to receive the first CSI-RS; transmit the SRS through the first SRS resource at a plurality of time instants; and the processing unit 1110 is configured to determine the plurality of precodings based on the first CSI-RS.

[0226] When the communication apparatus 1100 is used to implement the function of the network device in the method embodiment shown in FIG. 8, the transceiver 1120 is configured to transmit the first CSI-RS; receive the SRS transmitted through the first SRS resource at a plurality of time instants; and the processing unit 1110 is configured to determine the downlink channel information based on the SRS received at the plurality of time instants.

[0227] For more detailed description of the processing unit 1110 and the transceiver 1120, please refer to the related description in the method embodiments shown in FIG. 5 and FIG. 8.

[0228] As shown in FIG. 12, the communication apparatus 1200 includes a processor 1210 and an interface circuit 1220. The processor 1210 and the interface circuit 1220 are coupled with each other. It can be understood that the interface circuit 1220 can be a transceiver or an input / output interface. Optionally, the communication apparatus 1200 can further include a memory 1230, configured to store instructions executed by the processor 1210 or store input data required by the processor 1210 to execute instructions or store data generated after the processor 1210 executes instructions.

[0229] When the communication apparatus 1200 is used to implement the method shown in FIG. 5 and / or FIG. 8, the processor 1210 is configured to implement the function of the processing unit 1110, and the interface circuit 1220 is configured to implement the function of the transceiver 1120.

[0230] When the communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the method embodiments. The terminal chip receives information from the base station, which can be understood as the information being received by other modules (such as a radio frequency module or an antenna) in the terminal first, and then being sent to the terminal chip by the modules. The terminal chip sends information to the base station, which can be understood as the information being sent to other modules (such as a radio frequency module or an antenna) in the terminal first, and then being sent to the base station by the modules.

[0231] When the communication device is a chip applied to a base station, the base station chip implements the functions of the base station in the method embodiments. The base station chip receives information from the terminal, which can be understood as the information being received by other modules (such as a radio frequency module or an antenna) in the base station first, and then being sent to the base station chip by the modules. The base station chip sends information to the terminal, which can be understood as the information being sent to other modules (such as a radio frequency module or an antenna) in the base station first, and then being sent to the terminal by the modules.

[0232] In this application, entity A sending information to entity B can be A sending directly to B, or A sending indirectly to B through other entities. Similarly, entity B receiving information from entity A can be entity B receiving the information sent by entity A directly, or entity B receiving the information sent by entity A indirectly through other entities. Here, entity A and B can be RAN nodes or terminals, or modules inside RAN nodes or terminals. The sending and receiving of information can be the information interaction between RAN nodes and terminals, for example, the information interaction between a base station and a terminal; the sending and receiving of information can also be the information interaction between two RAN nodes, for example, the information interaction between a CU and a DU; the sending and receiving of information can also be the information interaction between different modules inside one device, for example, the information interaction between a terminal chip and other modules in the terminal, or the information interaction between a base station chip and other modules in the base station.

[0233] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor, or any conventional processor.

[0234] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, which can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from, and write information to, the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also exist as discrete components in the base station or the terminal.

[0235] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable apparatus. The computer programs or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer programs or instructions can be transferred from one website site, computer, server, or data center to another website site, computer, server, or data center through a wired or wireless manner. The computer-readable storage medium can 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 available medium can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; an optical medium, such as a digital video disc; or a semiconductor medium, such as a solid-state disk. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0236] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0237] In the present application, "at least one" means one or more, "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent: A exists alone, A and B exist together, B exists alone, where A, B can be singular or plural. In the text description of the present application, the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0238] It can be understood that various numerical numbers involved in the embodiments of the present application are only distinguished for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic.

Claims

1. A method of transmitting a signal, characterized by, The method comprises: receiving a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings comprising a first precoding and a second precoding, and the first precoding being different from the second precoding; transmitting a first channel sounding reference signal (SRS) and a second SRS, the first SRS being transmitted on a first SRS resource using the first precoding, and the second SRS being transmitted on a second SRS resource using the second precoding; wherein the first SRS and the second SRS are used by a network device to determine downlink channel information, and a transmission period of the first SRS resource is different from a transmission period of the second SRS resource.

2. A method of receiving a signal, characterized by, The method comprises: transmitting a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings comprising a first precoding and a second precoding, and the first precoding being different from the second precoding; receiving a first channel sounding reference signal (SRS) and a second SRS, the first SRS being transmitted on a first SRS resource using the first precoding, and the second SRS being transmitted on a second SRS resource using the second precoding; determining downlink channel information based on the first SRS and the second SRS; wherein a transmission period of the first SRS resource is different from a transmission period of the second SRS resource.

3. The method of claim 1 or 2, wherein: a priority of the first SRS resource is higher than a priority of the second SRS resource.

4. The method of claim 3, wherein: the first SRS resource is a semi-periodic resource, and the second SRS resource is a periodic resource.

5. The method of claim 3, wherein: the first SRS resource and the second SRS resource are both periodic resources.

6. The method of claim 5, wherein: a transmission period of the first SRS resource is greater than a transmission period of the second SRS resource.

7. The method of any one of claims 1-6, wherein: a frequency hopping number of the first SRS resource and a frequency hopping number of the second SRS resource are both m, a frequency hopping period of the second SRS resource is T, and a frequency hopping period of the first SRS resource is kT, the k and the m are coprime, and the k, the m, and the T are all integers.

8. The method according to any one of claims 1 or 3-7, characterized in that, The method further comprises: receiving configuration information, the configuration information being used to indicate that the priority of the first SRS resource is higher than the priority of the second SRS resource.

9. A method of transmitting a signal, characterized by, The method comprises: receiving a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; transmitting a channel sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precodings corresponding to the plurality of time instants when the SRS is transmitted being varied according to a preset period, and all belonging to the plurality of precodings; wherein the SRS transmitted at the plurality of time instants is used to determine downlink channel information.

10. A method of receiving a signal, characterized by, The method comprises: transmit a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; receive a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the SRS received at the plurality of time instants being varied according to a preset period, and belonging to the plurality of precodings; determine downlink channel information based on the SRS received at the plurality of time instants.

11. The method of claim 9 or 10, wherein the precoding corresponding to the SRS at any time instant of the plurality of time instants is determined according to a sequence number of the any time instant and the preset period.

12. The method of claim 11, wherein the preset period is kT, T representing a frequency hopping period of the SRS; if a value obtained by taking the sequence number n of the any time instant modulo the k is 0, the precoding corresponding to the any time instant is a first precoding; if the value obtained by taking the sequence number n of the any time instant modulo the k is not 0, the precoding corresponding to the any time instant is a second precoding; wherein the first precoding is different from the second precoding, the k and m are co-prime, the m represents a frequency hopping number of the SRS, and the n, the k, the T and the m are all integers greater than or equal to 1.

13. The method of claim 9 or 10, wherein the precoding corresponding to the SRS at any time instant of the plurality of time instants is determined according to a sequence number of the any time instant, the preset period and a frequency hopping number of the SRS.

14. The method of claim 13, wherein the preset period is JmT, the m representing a frequency hopping number, and the T representing a frequency hopping period of the SRS; if a value obtained by taking the sequence number n of the any time instant modulo Jm is less than the m, the precoding corresponding to the any time instant is a first precoding; if the value obtained by taking the sequence number n of the any time instant modulo Jm is greater than or equal to the m, the precoding corresponding to the any time instant is a second precoding; wherein the first precoding is different from the second precoding, the n, the T and the m are all integers greater than or equal to 1, and the J is an integer greater than or equal to 2. comprising: a receiving unit, configured to receive a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; the plurality of precodings comprising a first precoding and a second precoding, and the first precoding being different from the second precoding; a transmitting unit, configured to transmit a first sounding reference signal (SRS) and a second SRS, the first SRS being transmitted on a first SRS resource using the first precoding, and the second SRS being transmitted on a second SRS resource using the second precoding; wherein the first SRS and the second SRS are used by a network device to determine downlink channel information, and a transmission period of the first SRS resource is different from that of the second SRS resource.

15. A communications device, characterized by comprising: ​ ​ ​ 16. A communications device, characterized by ​ a sending unit configured to send a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings, the plurality of precodings including a first precoding and a second precoding, and the first precoding being different from the second precoding; a receiving unit configured to receive a first channel sounding reference signal (SRS) and a second SRS, the first SRS being sent on a first SRS resource using a first precoding, and the second SRS being sent on a second SRS resource using a second precoding; determine downlink channel information based on the first SRS and the second SRS; wherein a transmission period of the first SRS resource is different from that of the second SRS resource.

17. A communications device, characterized by comprising: a receiving unit configured to receive a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; a sending unit configured to send a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the SRS sent at the plurality of time instants being varied according to a preset period, and all belonging to the plurality of precodings; wherein the SRS sent at the plurality of time instants is used to determine downlink channel information.

18. A communications device, characterized by comprising: a sending unit configured to send a first channel state information reference signal (CSI-RS), the first CSI-RS being used to determine a plurality of precodings; a receiving unit configured to receive a sounding reference signal (SRS) through a first SRS resource at a plurality of time instants, the precoding corresponding to the SRS received at the plurality of time instants being varied according to a preset period, and belonging to the plurality of precodings; a processing unit configured to determine downlink channel information based on the SRS received at the plurality of time instants.

19. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, when the computer instructions run on a communication device, cause the communication device to perform the method in any one of claims 1-14.

20. A computer program product, characterised in that, The computer readable storage medium stores computer instructions, when the computer instructions run on a communication device, cause the communication device to perform the method in any one of claims 1-14.

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