Method for transmitting detection reference signal, and related products

Abstract

A method for transmitting a sounding reference signal and related products, which are applied to the situation where spatial relationship information of uplink transmission resources is not configured. The method includes: a terminal device determining a spatial relationship based on a downlink reference signal; the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device, or the downlink reference signal being the downlink reference signal with the largest number of ports among optional downlink reference signals; the terminal device transmitting a sounding reference signal based on the spatial relationship. It can reduce the signaling transmission amount of an access device, and improve the accuracy of channel estimation and communication performance.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a method for transmitting a sounding reference signal and related products. Background Art

[0002] To reduce high-frequency path loss, communication between a base station and a terminal device relies on the antenna gain brought by an analog beam. An analog beam is directional, and a main lobe direction and a 3dB beam width can be used to describe an analog beam pattern. Among them, the narrower the beam width, the greater the antenna gain. The base station and the terminal device can send and receive signals in a specific direction. Taking downlink communication as an example, the base station sends in a specific direction, and the terminal device receives in a specific direction. Normal communication can be achieved when the sending direction of the base station is aligned with the receiving direction of the terminal device. According to the protocol framework of the Third Generation Partnership Project (3GPP), the directions of the receiving beam and the sending beam of the terminal device depend on the beam indication information provided by the base station.

[0003] A sounding reference signal (SRS) is an uplink channel sounding signal sent by a terminal device and received by a base station. The time-frequency resources, transmission beam, transmission power, etc. used for sending the SRS are configured by the base station for the terminal device. However, if the base station configures resources for each SRS sent by the terminal device, and reconfigures the transmission beam due to changes in the positions of the base station and the terminal, it will consume a large amount of signaling. If there is no explicit spatial relation info, the downlink reference signal (DL RS) included in the transmission configuration indicator (TCI) of the control channel is used as a reference to send the SRS.

[0004] However, when the terminal device uses the downlink reference signal included in the TCI of the control channel as a reference to send the SRS, there is a situation where the base station cannot correctly receive it, resulting in the base station being unable to perform correct channel estimation based on the SRS, and further resulting in low communication performance.

[0005] Application Content

[0006] Embodiments of this application provide a method for transmitting a sounding reference signal and related products, which are used to reduce the signaling transmission volume of an access device, improve the accuracy of channel estimation, and improve communication performance.

[0007] On the one hand, an embodiment of the present application provides a method for transmitting a sounding reference signal, which is applied to the case where spatial relationship information of uplink transmission resources is not configured. The method includes: a terminal device determining a spatial relationship based on a downlink reference signal; the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device, or the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals; the terminal device transmitting a sounding reference signal based on the spatial relationship.

[0008] The above-mentioned sounding reference signal is an uplink channel sounding signal, which is transmitted by the terminal device and received by the access device. The SRS transmission method includes time-frequency resources, transmission beams, transmission power, etc., which are configured by the access device for the terminal device. In the protocol framework of 3GPP R15, the access device can configure one or more SRS resource sets for the terminal device, and each SRS resource set has one or more SRS resources. In addition, in 3GPP R15, different SRS resource sets perform different functions. R15 supports a total of six functions: {beam management, codebook, non-codebook, antenna switching, positioning, mobility}, which is translated as {beam management, codebook, non-codebook, antenna switching, positioning, mobility}. The base station notifies the terminal of the function of the SRS resource set by configuring the usage of each set through radio resource control (RRC). The first four of these functions can be abbreviated as {BM, CB, NCB, AS}.

[0009] The above-mentioned uplink transmission resources are the resources used to transmit the sounding reference signal. The set of SRS resources configured by the access device for the terminal device is not empty, but the access device does not indicate the spatial relationship of a certain or certain SRS resources used for transmitting SRS, and it can be considered that the spatial relationship information of the uplink transmission resources is not configured. The above-mentioned downlink reference signal is the downlink reference signal sent by the access device to the terminal device, and more specifically, it can be the downlink reference signal included in the TCI state sent by the access device to the terminal device.

[0010] The TCI state sent by the above access device to the terminal device may be: the TCI state of the activated physical downlink shared channel (PDSCH), the TCI state of the selected physical downlink control channel (PDCCH), the TCI state of the configured channel status information reference signal (CSI-RS), and the downlink reference signal in the spatial relationship of other configured SRSs.

[0011] The above spatial relationship may correspond to the default spatial relationship introduced in the previous text, and this spatial relationship is used to indicate the transmission direction of the transmission beam for transmitting the SRS; if the downlink reference signal can be received by the terminal device, and the terminal device uses the beam for receiving the downlink reference signal to transmit the sounding reference signal, then the base station can receive the SRS transmitted by the above terminal device in the direction aligned with the transmission direction of the downlink reference signal. The terminal device transmitting the sounding reference signal according to the spatial relationship includes: the terminal device transmitting the sounding reference signal in the transmission direction corresponding to the spatial relationship.

[0012] In this embodiment, the optional downlink reference signal refers to the downlink reference signal that can be selected as the reference for the spatial relationship of the sounding reference signal; there may be 1 optional downlink reference signal, or there may be more than 1; in the case where there is 1 optional downlink reference signal, this downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals; if there are more than 1 downlink reference signals that can be selected for use, then meeting the requirement of being able to be received by at least two panels of the terminal device, or having the largest number of ports, any one of the downlink reference signals can be arbitrarily selected. The above panel refers to the receiving antenna panel of the terminal device.

[0013] After determining the spatial relationship in this embodiment, the problem of improper use of the default spatial relationship in the background art can already be solved. Therefore, transmitting the sounding reference signal can be an optional step for the terminal device.

[0014] The access device in this embodiment may be a base station device or other device that provides wireless access to the terminal device, wherein the base station device may be a base station, a relay station or an access point. The base station may be a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA) network, or a base station (NodeB, NB) in a wideband code division multiple access (WCDMA), or an evolved base station (Evolutional NodeB, eNB or eNodeB) in a long term evolution (LTE). The base station device may also be a wireless controller in a cloud radio access network (CRAN) scenario. The base station device may also be a base station device in a future 5G network or a network device in a future evolved public land mobile network (PLMN) network. The base station device may also be a wearable device or a vehicle-mounted device.

[0015] The terminal device may be user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, terminal terminal, terminal, wireless communication device, terminal agent or terminal device, etc. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolved PLMN network, etc.

[0016] By adopting the method for sending a detection reference signal provided in an embodiment of the present application, if the downlink reference signal can be received by at least two panels of the terminal device, then the detection reference signals sent by the at least two panels determine the spatial relationship based on the downlink reference signal and can also be received by the access device; alternatively, by selecting a downlink reference signal with a larger number of ports, high-performance multi-stream transmission can be supported, thereby improving communication performance.

[0017] In addition, in this embodiment, whether a reference signal is received or not can be understood as whether the energy of the reference signal reaching the receiver of the receiving party is greater than or less than a threshold value.

[0018] In an alternative implementation, the downlink reference signal is the downlink reference signal included in a Transmission Configuration Indicator (TCI) state in an active state.

[0019] In this embodiment, the TCI state may be informed by the access device to the terminal device; when the TCI state is in an active state, the terminal device uses the beam for transmitting the sounding reference signal that receives the downlink reference signal included in the active TCI state, which can ensure that the access device receives it.

[0020] In an alternative implementation, the downlink reference signal that can be received by at least two panels of the terminal device includes: when the purpose of the uplink transmission resource is a codebook and the uplink transmission resource is greater than 1, the downlink reference signal is the downlink reference signal that can be received by at least two panels of the terminal device.

[0021] The case where the purpose of the uplink transmission resource is a codebook may be that the access device configures the usage of the Sounding Reference Signal (SRS) resource set as a codebook, and the uplink transmission resource being greater than 1 may be that the number of SRS resources in the above SRS resource set is greater than 1. If the number of SRS resources in the SRS resource set is 2, then two panels can transmit on these 2 SRS resources, which can ensure that the sounding reference signal can be correctly received by the access device.

[0022] If the spatial relation information of the uplink transmission resource is not configured and the associated CSI reference signal (associated CSI-RS) is configured, the above associated CSI-RS can also be used to determine the spatial relation.

[0023] In an alternative implementation, the downlink reference signal that can be received by at least two panels of the terminal device includes:

[0024] If two or more downlink reference signals can be received by at least two panels of the terminal device; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or the downlink reference signal is the downlink reference signal included in the TCI state with the smallest PDCCH control resource set identifier among the two or more downlink reference signals; or the downlink reference signal is a downlink reference signal with a quasi-co-location (QCL) type of D.

[0025] In this embodiment, it is sufficient for the downlink reference signal to be receivable by at least two panels of the terminal device; the further setting of the reference signal provided in this embodiment can be understood as a special setting of this embodiment; in practical applications, the downlink reference signal can also be the downlink reference signal with the second-best quality or the non-worst quality among the two or more downlink reference signals; the most recently used downlink reference signal can also be replaced with other downlink reference signals that are not the most recently used; the smallest identifier can also be replaced with other TCI states that do not have the smallest identifier, such as the second-smallest or other TCI states with non-maximum identifiers, and other settings are similar and will not be elaborated here. Therefore, the further restriction on the downlink reference signal in this embodiment should not be understood as a unique limitation of this embodiment.

[0026] In addition, in this embodiment, a downlink reference signal with a QCL type of D can also be selected first, and then a downlink reference signal that can be received by at least two panels of the terminal device can be selected from the selected downlink signals. If there are still multiple downlink reference signals that meet the conditions, then the downlink reference signal can be further selected according to the selection method of this embodiment.

[0027] In an alternative implementation, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes: when the use of the uplink transmission resource is non-codebook, the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals.

[0028] When the use of the uplink transmission resource is non-codebook, there is no predefined precoder, that is, no predefined codebook. At this time, the terminal device can calculate the precoder by itself to send the sounding reference signal. Specifically: the terminal device performs channel estimation based on the downlink reference signal by itself to determine the precoding matrix for uplink transmission. If a downlink reference signal with a larger number of ports is selected as a reference to send the sounding reference signal, then the terminal device has a higher probability of measuring a high-rank channel, and thus the precoding matrix calculated for uplink transmission can support multi-stream uplink transmission, thereby improving the performance of uplink transmission.

[0029] In an alternative implementation, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes:

[0030] If there are two or more downlink reference signals with the largest number of ports; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or, the downlink reference signal is the downlink reference signal included in the TCI state with the smallest physical downlink control channel (PDCCH) control resource set identifier among the two or more downlink reference signals, or, the downlink reference signal is a quasi-co-location (QCL) type A downlink reference signal.

[0031] In this embodiment, it is sufficient for the downlink reference signal to have the largest number of ports; the further setting of the reference signal provided in this embodiment can be understood as a special setting of this embodiment; the description of this special setting has been provided above and will not be elaborated here.

[0032] In addition, in this embodiment, a downlink reference signal of QCL type A can be first selected, and then a downlink reference signal that can be received by at least two panels of the terminal device can be selected from the selected downlink signals. If there are still multiple downlink reference signals that meet the conditions, then the downlink reference signal can be further selected according to the selection method of this embodiment.

[0033] In an alternative implementation, before the terminal device determines the spatial relationship based on the downlink reference signal, the method further includes: the terminal device receives configuration information sent by the access device, and the configuration information is used to configure the state of one or more transmission configuration indicator (TCI). This embodiment provides a specific implementation means for the terminal device to obtain the TCI state. If the TCI state is configured by other devices such as a base station controller, it will not affect the implementation of this embodiment. Therefore, the embodiments of the present application do not uniquely limit the specific configuration means.

[0034] In an alternative implementation, the terminal device receiving the configuration information sent by the access device includes: the terminal device receives a medium access control-control element (MAC CE) signaling sent by the access device. This embodiment provides a specific signaling for the configuration information. The configuration information can be carried in the MAC CE to specify the TCI state in the active state. The specific signaling design will be described in detail in subsequent embodiments.

[0035] In an optional implementation, before the terminal device receives the configuration information sent by the access device, the method further includes: the terminal device receives the radio resource control (RRC) configuration sent by the access device, where the RRC configuration is a set of sounding reference signal (SRS) resources using a codebook, and a set of transmission configuration indicator (TCI) states; or, the RRC configuration is a set of SRS resources not using a codebook, and a set of TCI states; the uplink transmission resource is an SRS resource. This embodiment provides specific means for the terminal device to obtain the uplink transmission resource and the specific content of the uplink transmission resource, which is compatible with 3GPP R15. In practical applications, if the access device uses other signaling or messages to inform the terminal device of the available uplink transmission resources, it will not affect the implementation of this embodiment of the present application. Therefore, the examples in this embodiment should not be construed as a unique limitation on this embodiment of the present application.

[0036] In a second aspect, an embodiment of the present application further provides a communication device, including:

[0037] A relationship determination unit, configured to determine a spatial relationship based on a downlink reference signal when spatial relationship information of uplink transmission resources is not configured; the downlink reference signal is a downlink reference signal that can be received by at least two panels of the communication device, or the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals;

[0038] A sending unit, configured to send a sounding reference signal according to the spatial relationship.

[0039] In this embodiment, the content executed by the relationship determination unit may refer to the description in the embodiment of the first aspect above, and will not be repeated here. The various possible implementation manners provided in the first aspect may also be applied to the relationship determination unit of this embodiment, and this embodiment will not be repeated either.

[0040] The communication device in this embodiment may be a terminal device or a chip in the terminal device; among them, the relationship determination unit may be a processing unit or a processor, which may correspond to the processor in the terminal device or a chip that performs data processing, and the sending unit may be a communication port of the chip or a hardware entity such as a radio frequency module of the terminal device that has the function of sending a sounding reference signal.

[0041] In an optional implementation, the communication device further includes: a receiving unit, configured to receive configuration information sent by an access device before the relationship determination unit determines the spatial relationship based on the downlink reference signal, where the configuration information is used to configure the state of one or more TCIs.

[0042] The above receiving unit may be an interface or a hardware entity for communication between the terminal device and the access device, or may be the communication interface of the chip in the foregoing text; when the receiving unit is the communication interface of the chip, the configuration information received by the receiving unit may be the forwarded configuration information sent by the access device, and is forwarded by the radio frequency module of the terminal device or other hardware entities having communication with the access device.

[0043] In a third aspect, an embodiment of the present application further provides a communication device, including: a processor, a memory, and a transceiver;

[0044] The memory stores program code, and the processor executes the step of determining the spatial relationship in any one of the methods provided in the first aspect when executing the program code; the transceiver is used to send a sounding reference signal according to the spatial relationship.

[0045] In a fourth aspect, an embodiment of the present application further provides a communication device, including a processor, a memory, and a transceiver;

[0046] The transceiver is used to receive or send a signal;

[0047] The memory is used to store program code;

[0048] The processor is used to call the program code from the memory to execute any one of the methods provided in the embodiments of the present application.

[0049] In a fifth aspect, an embodiment of the present application further provides a communication device, including: a processor, when the processor calls a computer program in the memory, any one of the methods provided in the embodiments of the present application is executed.

[0050] In a sixth aspect, an embodiment of the present application further provides a communication device, including: a memory and a processor; the memory is used to store a computer program, and when the processor calls the computer program in the memory, the communication device executes any one of the methods provided in the embodiments of the present application.

[0051] In a seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, the computer-readable storage medium includes instructions, and when the instructions run on a computer, the computer is caused to execute any one of the methods provided in the embodiments of the present application.

[0052] In an eighth aspect, an embodiment of the present invention further provides a computer program product, the computer program product includes a computer program or instructions, and when the computer program or instructions run on a computer, the computer is caused to execute any one of the methods provided in the embodiments of the present application. Description of the Drawings

[0053] To more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the following will describe the drawings used in the embodiments of the present application or the background art.

[0054] Figure 1 Schematic diagram of the system structure of the embodiment of the present application;

[0055] Figure 2 Schematic diagram of the signal transceiver of the two panels of the terminal in the embodiment of the present application;

[0056] Figure 3 Schematic diagram of the method flow of the embodiment of the present application;

[0057] Figure 4 Schematic diagram of the format of the MAC CE signaling in the embodiment of the present application;

[0058] Figure 5 Schematic diagram of the method flow of the embodiment of the present application;

[0059] Figure 6 Schematic diagram of the format of the MAC CE signaling in the embodiment of the present application;

[0060] Figure 7 Schematic diagram of the structure of the communication device in the embodiment of the present application;

[0061] Figure 8 Schematic diagram of the structure of the communication device in the embodiment of the present application;

[0062] Figure 9 Schematic diagram of the structure of the communication device in the embodiment of the present application. Detailed implementation manners

[0063] The following describes the embodiments of the present application in combination with the drawings in the embodiments of the present application.

[0064] Before introducing this embodiment, the technical terms involved in the embodiments of the present application are described as follows:

[0065] Beam: A beam is a communication resource. A beam can be a wide beam, a narrow beam, or other types of beams. The technology for forming a beam can be beamforming technology or other technical means. Beamforming technology can specifically be digital beamforming technology, analog beamforming technology, or hybrid digital / analog beamforming technology. Different beams can be considered different resources. The same information or different information can be sent through different beams. Optionally, multiple beams with the same or similar communication characteristics can be regarded as one beam. One beam can include one or more antenna ports for transmitting data channels, control channels, sounding signals, etc. For example, a transmit beam can refer to the signal intensity distribution formed in different directions in space after the signal is transmitted through the antenna, and a receive beam can refer to the signal intensity distribution of the wireless signal received by the antenna in different directions in space. It can be understood that one or more antenna ports forming a beam can also be regarded as an antenna port set. The manifestation of a beam in the protocol can also be a spatial filter (spatial filter, or spatial domain transmission filter, or spatial domain reception filter).

[0066] Beam management resource: It refers to the resources used for beam management and can also be manifested as the resources used for calculating and measuring beam quality. Beam quality includes layer 1 reference signal received power (L1-RSRP), layer 1 reference signal received quality (L1-RSRQ), etc. Specifically, beam management resources can include synchronization signals, broadcast channels, downlink channel measurement reference signals, tracking signals, downlink control channel demodulation reference signals, downlink shared channel demodulation reference signals, uplink sounding reference signals, uplink random access signals, etc.

[0067] Beam indication information: Used to indicate the beam used for transmission, including the transmit beam and / or the receive beam. It includes at least one of the beam number, beam management resource number, uplink signal resource number, downlink signal resource number, absolute index of the beam, relative index of the beam, logical index of the beam, index of the antenna port corresponding to the beam, index of the antenna port group corresponding to the beam, index of the downlink signal corresponding to the beam, time index of the downlink synchronization signal block corresponding to the beam, beampair link (BPL) information, transmit parameter (Tx parameter) corresponding to the beam, receive parameter (Rx parameter) corresponding to the beam, transmit weight corresponding to the beam, weight matrix corresponding to the beam, weight vector corresponding to the beam, receive weight corresponding to the beam, index of the transmit weight corresponding to the beam, index of the weight matrix corresponding to the beam, index of the weight vector corresponding to the beam, index of the receive weight corresponding to the beam, receive codebook corresponding to the beam, transmit codebook corresponding to the beam, index of the receive codebook corresponding to the beam, index of the transmit codebook corresponding to the beam. The downlink signal includes any one of the synchronization signal, broadcast channel, broadcast signal demodulation signal, channel state information reference signal (CSI-RS), cell specific reference signal (CS-RS), user equipment specific reference signal (US-RS), downlink control channel demodulation reference signal, downlink data channel demodulation reference signal, and downlink phase noise tracking signal. The uplink signal includes any one of the uplink random access sequence, uplink sounding reference signal, uplink control channel demodulation reference signal, uplink data channel demodulation reference signal, and uplink phase noise tracking signal. Optionally, the network device may also allocate QCL identifiers to the beams with QCL relationships among the beams associated with the frequency resource group. A beam can also be referred to as a spatial domain transmission filter, a transmit beam can also be referred to as a spatial domain transmit filter, and a receive beam can also be referred to as a spatial domain receive filter. The beam indication information can also be embodied as TCI, and various parameters can be included in the TCI, such as cell number, bandwidth part number, reference signal identifier, synchronization signal block identifier, QCL type, etc.

[0068] Quasi-co-location (QCL): The co-location relationship is used to indicate that multiple resources have one or more identical or similar communication characteristics. For multiple resources with a co-location relationship, the same or similar communication configuration can be adopted. For example, if two antenna ports have a co-location relationship, then the large-scale characteristics of the channel when one port transmits a symbol can be inferred from the large-scale characteristics of the channel when the other port transmits a symbol. The large-scale characteristics may include: delay spread, average delay, Doppler spread, Doppler shift, average gain, reception parameters, the receiving beam number of the terminal device, transmit / receive channel correlation, angle of arrival (AoA) of reception, spatial correlation of the receiver antenna, main AoA, average AoA, spread of AoA, etc.

[0069] Spatial QCL: Spatial QCL can be considered a type of QCL. There are two perspectives to understand spatial: from the transmitter or from the receiver. From the transmitter's perspective, if two antenna ports are spatially quasi-co-located, it means that the corresponding beam directions of these two antenna ports are the same in space, that is, the spatial filter is the same. From the receiver's perspective, if two antenna ports are spatially quasi-co-located, it means that the receiver can receive the signals transmitted by these two antenna ports in the same beam direction, that is, QCL regarding reception parameters.

[0070] Beamforming technology can achieve a higher antenna array gain by directing towards a specific direction in space. Analog beamforming can be implemented through radio frequency. For example, an RF chain adjusts the phase through a phase shifter to control the change in the analog beam direction. Therefore, an RF chain can emit an analog beam at the same moment.

[0071] Antenna panel (Panel):

[0072] The antenna panel in the embodiments of this application can be abbreviated as panel. Each antenna panel can be configured with one or more receiving beams and one or more transmitting beams. Therefore, the antenna panel can also be understood as a beam group. A communication device, such as a terminal device or a network device, can receive signals through the receiving beams on the antenna panel and can also transmit signals through the transmitting beams on the antenna panel.

[0073] Specifically, the network device communicates with the terminal device via an antenna, that is, the terminal device and the network device use the antenna to receive and send signals. Both the terminal device and the network device have antenna elements. Multiple antenna elements can be integrated on a panel, and this panel integrated with antenna elements is called an antenna panel (which can also be represented by "panel"). Each antenna panel can generate one or more beams, that is, each antenna panel can send and receive signals in one or more directions.

[0074] The antenna panel can also be represented as an antenna array or an antenna subarray. An antenna panel can include one or more antenna arrays (antenna subarrays). An antenna panel can be controlled by one or more oscillators. A radio frequency circuit can drive one or more antenna elements on the antenna panel. Therefore, an antenna panel can be driven by one radio frequency link or multiple radio frequency links. A radio frequency link can also be referred to as a receiving channel and / or a transmitting channel, a receiver branch, etc. Therefore, the antenna panel can also be replaced by a radio frequency link or multiple radio frequency links that drive an antenna panel or one or more radio frequency links controlled by one oscillator.

[0075] The antenna panel can also be a logical concept. An antenna panel can be a logical entity (i.e., without reflecting the physical antenna structure), for example, a set of antenna ports, or a set of transmitting and / or receiving beams, or a set of transmitting and / or receiving directions.

[0076] In the subsequent embodiments, the base station is taken as an example for illustration, and this will not be elaborated further hereinafter. As Figure 1 shown, it is a schematic diagram of the application system of the embodiment of the present application, including a base station and a terminal device. The base station and the terminal device send data or signaling to each other in the form of transmitting beams; as mentioned above, in the 3GPP R15 protocol framework, the configuration of the SRS transmission method includes the indication of the transmitting beam. For the terminal device, the transmitting beam is an uplink beam, so it is also called the indication of the uplink beam. The specific method of the uplink beam indication is as follows:

[0077] In 3GPP R15, the transmission beam of SRS resources is indicated by SRS spatial relation information (SRS-SpatialRelationInfo). This SRS-SpatialRelationInfo contains a reference signal, which can be a downlink signal such as a synchronization signal / physical broadcast channel block (SS / PBCH block or SSB) or a channel status information reference signal (CSI-RS), or it can be an uplink signal SRS. When the referenceSignal is a downlink reference signal, the terminal device uses the transmission beam corresponding to the reception beam for receiving this downlink reference signal to transmit SRS. When the referenceSignal is an uplink reference signal, the terminal device should use the transmission beam by which the base station transmits this SRS to transmit the SRS that the terminal device wants to transmit. The specific content included in SRS-SpatialRelationInfo is as follows:

[0078]

[0079]

[0080] In the above SRS - SpatialRelationInfo, the bandwidth can be understood as a continuous or discontinuous resource in the frequency domain. For example, the bandwidth can be a cell, a carrier, or a bandwidth part. Among them, the cell can be the serving cell of the terminal. The serving cell is described by the upper layer from the perspective of resource management, mobility management, or service unit. The coverage area of each network device can be divided into one or more serving cells, and the serving cell can be regarded as composed of a certain frequency domain resource, that is, a serving cell can include one or more carriers. The concept of a carrier is described from the perspective of signal generation at the physical layer. A carrier is defined by one or more frequency points, corresponding to a continuous or discontinuous spectrum, and is used to carry communication data between the network device and the terminal. The downlink carrier can be used for downlink transmission, and the uplink carrier can be used for uplink transmission. In addition, a carrier can include one or more bandwidth parts. It should be noted that if a cell includes one carrier, one carrier can be regarded as an independent cell without considering the physical location. That is, the carrier can be equivalently replaced with the cell. The bandwidth part (bandwidth part, BWP) can be called the carrier bandwidth part, subband bandwidth, narrowband bandwidth, or other names. For the convenience of description, the following embodiments will be described with BWP as an example, but this application does not limit this.

[0081] The transmission beam of the physical uplink control channel (physical uplink control channel, PUCCH) is indicated by PUCCH - SpatialRelationInfo. Reference can be made to SRS - SpatialRelationInfo, which will not be elaborated here.

[0082] Based on the foregoing description, if a transmission beam is configured for each SRS resource, since the number of SRS resources is large, the signaling overhead will be very large; moreover, when changing the transmission beam of the SRS resource, it is necessary to consume signaling to inform the terminal device of the change in the transmission beam of the SRS resource, so the signaling overhead is very large. To solve this problem, if the default uplink transmission beam is used, that is: when there is no configured spatial relation info, the default spatial relation used by the terminal device. The content of this default spatial relation can include: the default TCI state or quasi - co - location (QCL) assumption of the PDSCH, the active TCI state of the PDCCH control resource set (control resource set, CORESET), and the path loss estimation reference signal.

[0083] As described above, SRS can be divided into different SRS resource sets according to functions to undertake different functions. In R15, four functions are supported in total: {beammanagement, codebook, noncodebook, antennaswitching}. The base station configures the usage of each SRS resource set through RRC to notify the terminal device of the function of the SRS resource set. The SRS resources with the usage configured as codebook or noncodebook are used for the transmission of uplink data, that is, PUSCH. The base station performs channel estimation by measuring the SRS sent by the terminal device and provides indication information to the terminal device as a reference for the precoding matrix (or simply precoding, precoder) for the terminal device to perform PUSCH transmission. However, using the default spatial relationship will reduce the performance of PUSCH. The following embodiments will provide two embodiments to specifically illustrate the reasons why using the default spatial relationship in two aspects of codebook (CB) or noncodebook (NCB) will reduce the performance of PUSCH and the solutions.

[0084] 1. The case where the usage of the SRS resource is CB:

[0085] For the SRS resources with the usage of CB, the base station calculates the precoding matrix (precoder) used by the terminal device through channel estimation and measurement of the SRS sent by the terminal device, and when scheduling uplink data transmission (that is, scheduling PUSCH), it notifies the terminal device to send the Transmit Precoding Matrix Indicator (TPMI). The set of precoders is predefined by the protocol (that is, the set of codebooks), and which one or more precoders to use can be determined by indicating the TPMI. However, if the terminal device has multiple transmit antenna panels, the base station can configure multiple SRS resources for the terminal device. For example, in R15, it is allowed to configure up to two SRS resources for an SRS resource set with a usage of codebook. One transmit panel of the terminal device uses the first SRS resource to send SRS, and the other transmit panel uses the second SRS resource to send SRS. The base station obtains the channel conditions from the different transmit antenna panels of the terminal device to the base station respectively by measuring the two received SRSs. When scheduling PUSCH, the base station also notifies the terminal device of the information of the SRS resource indicator (SRI); the terminal device determines the transmit antenna panel through the indication of the SRI, and then determines which one or more precoders to use through the TPMI indication.

[0086] Assume that the spatial relation info of the SRS is not configured, and the default spatial relation comes from a specific TCI state, for example: the default TCI state of the PDSCH or the active TCI state of the PDCCH CORESET. Then the following problem will exist: If the downlink reference signals provided in the TCI state cannot be received by multiple panels of the terminal device simultaneously, when the terminal device uses this TCI state as the spatial relation for transmitting the SRS, the base station cannot receive the SRS transmitted by some panels. This is because, based on the reciprocity of the uplink and downlink channels, the SRS transmitted by the panel that cannot receive the downlink reference signal cannot be received by the base station either.

[0087] As Figure 2 shown, Figure 2 illustrates the layers, antenna ports, transceiver unit (RRU), and antenna element. It also illustrates three stages of transmitting data: analog beamforming, digital beamforming, and precoder. Among them, TCI state #1 can provide information about the downlink reference signal, such as downlink reference signal 1 (DLRS#1). Under the condition of transceiver channel consistency, the receiving beam determined by the terminal device according to DL RS#1 can be used as a reference for the transmitting beam, that is, TCI state #1 can be used as a reference for determining the SRS spatial relation. If there is 1 SRS resource in an SRS resource set with a usage of CB, TCI state #1 can be used as a reference for determining the SRS#1 spatial relation. However, if there are 2 SRS resources in an SRS resource set with a usage of CB, TCI state #1 cannot be used as a reference for determining the SRS#2 spatial relation because DL RS#1 is not received on receiving antenna panel 2 of the terminal device. Therefore, when using this antenna panel to transmit SRS#2, SRS#2 cannot be received by the base station.

[0088] Based on the above description, if it is not considered whether multiple panels of the terminal device can receive the downlink reference signal when sending SRS, it may occur that some panels of the terminal device cannot receive the downlink reference signal, and correspondingly, the SRS sent by these panels cannot be received by the base station. In this embodiment, in the scenario of SRS resource set for CB, assuming that 2 sounding reference signal resources (SRS resources) are configured, the specific implementation manner in which the default spatial relation follows the transmission configuration number declaration (TCI state) including the downlink reference signal (DL RS) that can be simultaneously received by multiple panels of the UE is as follows:

[0089] Before or during the execution of all steps in this embodiment, beam training is continuously performed between the base station and the terminal device through the transmission, measurement, and feedback of reference signals. Subsequent embodiments will not elaborate on this.

[0090] During downlink communication, the base station continuously sends SSB or channel status information reference signal (CSI-RS). The terminal device measures the reception quality of the SSB or CSI-RS sent by the base station and feeds back the corresponding information, including: SSB index or CSI-RS resource ID, and the corresponding layer 1 reference signal receiving power (L1-RSRP) to the base station, so that the base station can select a beam pair with better quality for sending data channels or control channels, and at the same time enables the base station to correctly configure beam indication information for indicating the terminal device to receive the correct data channel or control channel.

[0091] The TCI state provided in this embodiment may include the following content:

[0092]

[0093] The specific process is as Figure 3 shown and includes:

[0094] 301: The base station configures and indicates the SRS resource set for codebook-based uplink transmission (codebook-based UL transmission) through RRC. Correspondingly, the terminal device receives the RRC and applies the configuration of the RRC.

[0095] The configuration of the SRS resource set includes the following configurations at the resource set level:

[0096] 1. Usage: Indicates the usage of this SRS resource set, which is codebook in this embodiment;

[0097] 2. SRS resources in the SRS resource set: The number of SRS resources in this embodiment is 2, that is, there are two different SRS resources;

[0098] 3. Power control parameters: Include the reference power P0, path loss compensation parameter alpha, path loss estimation reference signal, power accumulation parameter, etc.

[0099] In addition, a SRS resource set may include one or more SRS resources, and the following configurations at the resource level:

[0100] 4. Time-frequency resource pattern;

[0101] 5. Sequence;

[0102] 6. Frequency hopping pattern.

[0103] In this embodiment, the base station does not configure transmission beam information (spatialrelationinfo) for the SRS resource.

[0104] 302: The base station configures the TCI state set through RRC. Correspondingly, the terminal device receives and applies the RRC configuration.

[0105] In this step, the base station can configure multiple TCI states using RRC signaling. For example, configure a PDSCH TCI state list using the following signaling.

[0106] tci-StatesToAddModList SEQUENCE(SIZE(1..maxNrofTCI-States))OF TCI-State / / TCI add list status sequence (size (1.. maximum Nrof transmission configuration number of states)) TCI state

[0107] tci-StatesToReleaseListSEQUENCE(SIZE(1..maxNrofTCI-States))OF TCI-StateId / / TCI release list status sequence (size (1.. maximum Nrof transmission configuration number of states)) TCI state identifier

[0108] In this step, the base station can configure multiple PDSCH TCI states using RRC signaling. For example, it configures a PDCCH TCI state list using the following signaling.

[0109] tci-StatesPDCCH-ToAddList and tci-StatesPDCCH-ToReleaseList; the usage can refer to that of the PDSCH TCI state list. The PDCCH TCI list can be the same as or different from the PDSCH TCI list, and this embodiment does not limit this.

[0110] 303: The base station activates one or more TCI states through MAC CE signaling. Correspondingly, the terminal device receives the MAC CE and applies the configuration of the MAC CE signaling.

[0111] The base station activates one or more TCI states using MAC CE signaling, such as using the signaling Figure 4 shown.

[0112] where Ti represents the i-th TCI state configured in RRC. Ti = 1 indicates that the i-th TCI state is activated, and Ti = 0 indicates that the i-th TCI is deactivated. The base station sending the above MAC CE can configure a list of activated TCI states for the terminal device. Octal numbers 1 to N represent 8 bits per line. The above Figure 4 shown MAC CE is the UE-level PDSCH TCI state activation / deactivation MAC CE signaling (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE)

[0113] In addition, the above MAC CE can also be the UE-level PDCCH TCI state indication MAC CE (UE-specific PDCCH TCI state indication).

[0114] The activated TCI state indicates that the terminal device can measure and maintain the activated TCI state, including: maintaining the beam direction, reception weight, time offset, frequency offset, etc. corresponding to the activated TCI state. Therefore, when the base station uses the activated TCI state for beam indication in data transmission, the terminal device can correctly receive the data.

[0115] 304: The terminal device determines the transmission beam of the SRS resource according to the activated TCI state in the MAC CE signaling in 303.

[0116] More specifically: The terminal device activates certain TCI states according to the configuration of the MAC CE signaling, and determines the transmission beam of the SRS resource from the information of the reference signals included in these activated TCI states. The reference signals included in the TCI state are downlink signals, so they are also called the downlink reference signals included in the TCI state.

[0117] If a TCI state is activated in 303, then this TCI state can be used as a reference for the SRS resource transmission beam. If multiple TCI states are activated in 303, then one TCI state can be selected as a reference for the SRS resource transmission beam. The so-called reference in this embodiment, the specific reference method can be: The terminal device determines the transmission beam according to the consistency between the transmission beam and the reception beam, and refers to the reception beam of the downlink reference signal included in the received TCI state.

[0118] The method of selecting from multiple activated TCI states can be: The TCI state with the lowest identifier, the most recently transmitted, the most recently measured, the most recently reported TCI state, the default TCI state used for downlink communication, the TCI state of the PDCCH that schedules / triggers the SRS transmission, the TCI state of CORESET#0 or the QCL assumption, the TCI state used as a reference signal for path loss estimation. In addition, the reference signals in the TCI state selected by the terminal device can be received simultaneously by multiple receive antenna panels of the terminal device. If the reference signals included in multiple TCI states can be received simultaneously by multiple receive antenna panels of the terminal device, then the selection method of the terminal device can follow the following principles:

[0119] Option 1: The quality of the measured reference signal is the best;

[0120] Option 2: The TCI state identifier / reference signal identifier is the lowest, the most recently transmitted, the most recently measured, the most recently reported;

[0121] Option 3: The ID in the PDCCH CORESET is the lowest;

[0122] Since in this embodiment, a TCI state can include at most two different DL RSs, the reference signal of QCL Type D used for the downlink reception beam can be referred to.

[0123] The above definition of QCL Type D is: QCL-TypeD: {Spatial Rx parameter spatial reception parameter}

[0124] The default TCI state used for the above downlink communication can be, for example, the default TCI state of the PDCCH, or the default TCI state of the PDSCH. Further, it can also be the default TCI state of the PDSCH in the most recent time slot, and / or the PDCCH TCI state of the CORESET corresponding to the lowest CORESET ID. Among them, the lowest CORESET ID can be the lowest ID among other CORESETS excluding CORESET #0.

[0125] In this step, when the DL RS in the TCI state can be received simultaneously by multiple antenna panels of the terminal device, the two SRS signals sent by the terminal device on two SRS resources can be correctly received by the base station for the base station to estimate the channel and select the correct TPMI for the terminal device.

[0126] 305: The base station measures the SRS sent by the terminal device.

[0127] 306: The base station schedules the terminal device to send the PUSCH and indicates the SRI and TPMI in the scheduling information.

[0128] This embodiment ensures that without explicit spatial relation info configuration, the default spatial relation of the terminal device can support the SRSs sent by different transmission antenna panels of the terminal device to be correctly measured by the base station, thereby improving communication efficiency.

[0129] II. The case where the use of the SRS resource is for NCB:

[0130] The difference between NCB-based uplink transmission and CB-based uplink transmission is that the former does not have a precoder (i.e., a codebook) predefined by the protocol. Instead, the terminal device calculates the precoder used for transmitting the SRS by itself. The base station can configure multiple SRS resources for the terminal device. For example, up to 4 SRS resources can be configured for a set of SRS resources with a usage of nonCodebook. The terminal device can then determine 4 different precoders to transmit 4 SRSs by itself, and the base station determines which SRSs are better through measurement and configures the SRI information and the mapping relationship of the PUSCH DMRS ports to the terminal device when scheduling uplink transmission. The terminal device uses the downlink signal for channel measurement and estimation, and then calculates the precoder for SRS transmission. For example, a set of SRS resources with a usage of nonCodebook can be configured with an associated CSI-RS for channel measurement and precoder determination. The embodiments of this application can be applicable to scenarios where neither the spatial relation info of the SRS nor the associated CSI-RS is configured. If the spatial relation info of the SRS is not configured but the associated CSI-RS is configured, the associated CSI-RS can be used to determine the spatial relation.

[0131] Assume that the spatial relation info of the SRS is not configured, and the default spatial relation comes from a specific TCI state, such as the default TCI state of the PDSCH or the active TCI state of the PDCCH CORESET. Specifically, the channel estimation by the terminal device based on the downlink reference signal can be abstracted into the following formula:

[0132] y = Hx + n;

[0133] where y is the signal seen by the receiver, H is the channel, x is the signal sent by the transmitter, and n is the noise.

[0134] More specifically, H ∈ C Nrx×Ncsi is the channel matrix, Nrx is the number of receiving antennas of the terminal device, and Ncsi is the number of ports of the downlink reference signal.

[0135] Assume that the uplink and downlink channels are reciprocal, that is, the downlink channel transmitted by the base station and received by the terminal device is equal to the transpose of the uplink channel transmitted by the terminal device and received by the base station. Then the precoder for the terminal device to transmit the SRS has a matching uplink channel, and the behavior of the base station measuring the SRS for NCB can be abstracted into the following formula:

[0136] y UL = H UL V UL x UL + n UL ;

[0137] Among them, UL represents uplink transmission, y is the signal seen by the receiving end, H is the channel, V is the precoding matrix, x is the signal sent by the transmitting end, and n is the noise.

[0138] More specifically, H UL ∈ C Ncsi×Nrx is the uplink channel matrix, V UL ∈ C Nrx×Nsrs is the uplink channel matrix, Nsrs is the number of configured SRS resources, and V UL is composed of the eigenvectors of H UL . When Ncsi = {1, 2, 4}, the rank of H UL is at most {1, 2, 4}. When DL RS is 1 port, the SRS precoder estimated by the UE is for rank 1 PUSCH service.

[0139] Based on the above description, it can be seen that if the number of ports of the downlink reference signal provided in the TCI state is small, high-performance PUSCH transmission cannot be supported, such as multi-stream PUSCH transmission. This embodiment provides a specific implementation method in the field of SRS resource set for NCB where the default spatial relation follows the TCI state including the DL RS with the largest number of ports. Among them, the content included in the TCI state in this embodiment can refer to the previous embodiment and will not be elaborated here. The specific content is as follows:

[0140] 501: The base station configures an SRS resource set for non codebook-based UL transmission through RRC. Correspondingly, the terminal device receives the RRC and applies the RRC configuration.

[0141] The configuration of the SRS resource set can refer to 301 in the previous embodiment. The differences include:

[0142] 1. Usage: Indicates the purpose of this SRS resource set, which is non codebook in this embodiment;

[0143] 2. SRS resources in the SRS resource set: In this implementation, the number of SRS resources is not necessarily 2, that is, not necessarily two different SRS resources, and the number can be 1 or more.

[0144] In this embodiment, the base station does not configure transmission beam information (spatialRelationInfo) and associated CSI-RS for the SRS resource.

[0145] 502: The base station configures a set of TCI states through RRC. Correspondingly, the terminal device receives the RRC and applies the RRC configuration.

[0146] In this step, the base station can configure multiple TCI states using RRC signaling. For example, refer to the signaling in the previous embodiment 302 to configure a list of TCI states, which will not be elaborated here.

[0147] In addition, if CSI-RS is transmitted, qcl-info can be configured to guide the terminal device to receive CSI-RS.

[0148]

[0149]

[0150] The description of the above qcl-info is as follows: resource mapping (resourceMapping), CSI-RS resource mapping (CSI-RS-ResourceMapping), power control offset (powerControlOffset), integer (INTEGER), enumerated (ENUMERATED), optional (OPTIONAL), scrambling ID (scramblingID), period and offset (periodicityAndOffset), CSI resource period and offset (CSI-ResourcePeriodicityAndOffset), QCL periodic information for CSI-RS (qcl-InfoPeriodicCSI-RS), TCI state ID (TCI-StateId).

[0151] The previous embodiment can also use the qcl-info in this embodiment to guide the terminal device to receive CSI-RS, which will not be elaborated here.

[0152] 503: The base station activates one or more TCI states through MAC CE signaling. The terminal device receives the MAC CE and applies the MAC CE configuration.

[0153] The implementation method of configuring the TCI state using MAC CE signaling can refer to Figure 4 and the corresponding description, which will not be elaborated here. The base station can also use MAC CE signaling for SP CSI-RS resources and indicate the TCI state for each CSI-RS resource. As Figure 6As shown, it actually includes information such as the serving cell, BWP ID, etc. Among them, from oct4 to N + 4 are used to indicate the status of the TCI state ID.

[0154] In this embodiment, the set of TCI states can further include the TCI states configured for CSI-RS resources on the basis of the set of TCI states in the previous embodiment.

[0155] 504: The terminal device determines the transmission beam of the SRS resource according to the TCI state activated in the MAC CE signaling in 503.

[0156] More specifically: The terminal device activates certain TCI states according to the configuration of the MAC CE signaling, and determines the transmission beam of the SRS resource from the information of the reference signals included in these activated TCI states. The reference signals included in the TCI state are downlink signals, so they are also called the downlink reference signals included in the TCI state.

[0157] If a TCI state is activated in 503, then this TCI state can be used as a reference for the SRS resource transmission beam. If multiple TCI states are activated in 503, then one TCI state can be selected as a reference for the SRS resource transmission beam.

[0158] In this embodiment, the terminal device selects the reference for the default transmission beam according to the number of ports of the reference signal in the TCI state. The reference signal in the TCI state selected by the terminal device can have a larger number of ports. If the reference signals included in multiple TCI states all have a larger number of ports, the method of selecting the TCI state can refer to the description in 304 above and will not be elaborated here.

[0159] Since in this embodiment, a TCI state can include at most two different DL RSs, the reference signal of QCL Type A for downlink reception beam can be referred to.

[0160] The above definition of QCL-TypeA is: QCL-TypeA: {Doppler shift, Doppler spread, average delay, delay spread}

[0161] Since in this embodiment, the higher the number of ports of the DL RS in the TCI state, the higher-rank channel the terminal device can estimate, and then calculate the precoder to support the transmission of multi-stream PUSCH to achieve uplink capacity enhancement, thereby improving the communication ability.

[0162] 505: The base station measures the SRS sent by the terminal device.

[0163] 506: The base station scheduling terminal device transmits PUSCH, and indicates the SRI and the association relationship between the SRI and the PUSCH DMRS port in the scheduling information.

[0164] In this embodiment, the terminal device selects the TCI state corresponding to the DL RS with the largest number of ports as the reference for the default spatial relation, which can be applied to high-capacity multi-stream uplink transmission and improve the communication ability.

[0165] The methods of this embodiment and the previous embodiment are applicable to the situation where neither the path loss estimation reference signal nor the transmission beam information is configured.

[0166] The signaling in 302, 303, 502, and 503 of the above embodiments is independently configured for each carrier component (CC) and each BWP. The embodiments of the present application do not exclude the alternative of using all the TCI states configured for CCs and BWPs as the reference for SRS spatial relation. Additionally, if this method is supported, when selecting the TCI as the default spatial relation, the downlink reference signal can be selected according to the size of the CC / BWP ID.

[0167] Furthermore, in the embodiments of the present application, the priority can also be determined according to the function of the DL RS. When two or more DL RSs meet the requirements, the DL RS is selected as the DL RS for beam management in descending order of priority.

[0168] Among them, the functions of the DL RS include: synchronization, time-frequency tracking, beam management, channel information acquisition, positioning, mobility, noise tracking, demodulation reference, etc. For example: the priority of the DL RS for beam management is higher than that of the DL RS for channel information acquisition.

[0169] The DL RS for beam management is the RS for L1-RSRP reporting; it can also be the resource in the resource set configured with'repetition' (repetition).

[0170] In addition, the DL RS for channel information acquisition can be the RS for resource indicator (RI) / precoding matrix indicator (PMI) / CQI reporting. The DL RS for channel information acquisition can also be the resource in the resource set that is not configured with'repetition' and is not configured with 'trs' (tracking function).

[0171] Another method for determining priority, for example: The DL RS for beam management has a higher priority than the DL RS for time-frequency tracking, which is higher than the RS for synchronization.

[0172] Among them, the DL RS for time-frequency tracking can be the resources in the resource set configured with 'trs'; the RS for synchronization can be the SS / PBCH block.

[0173] In addition, if the priority is determined according to the four references of QCL Type A, B, C, and D, the priority of QCL Type D can be the highest.

[0174] Above, in combination with Figures 1 to 6 The method provided by the embodiments of the present application is described in detail. Below, in combination with Figures 7 to 9 The communication device provided by the embodiments of the present application is described in detail. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, for the content not described in detail, reference can be made to the above method embodiments. For the sake of brevity, it will not be repeated here.

[0175] The embodiments of the present application also provide a communication device, as Figure 7 shown, including:

[0176] A relationship determination unit 701, configured to determine a spatial relationship according to a downlink reference signal in the case where the spatial relationship information of the uplink transmission resource is not configured; the downlink reference signal is a downlink reference signal that can be received by at least two panels of the communication device, or the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals;

[0177] A sending unit 702, configured to send a sounding reference signal according to the spatial relationship.

[0178] The communication device in this embodiment may be a terminal device or a chip in the terminal device. Among them, the relationship determination unit 701 may correspond to the chip that performs data processing in the terminal device, and the sending unit 702 may be the communication port of the chip, or a hardware entity such as the radio frequency module of the terminal device that has the function of detecting and sending reference signals. Corresponding to the method embodiments described above, the relationship determination unit 701 may perform the functions of applying RRC configuration in 301 and 302, applying MAC CE configuration in 303, and determining the transmission beam of the SRS resource in 304; the sending unit 702 may perform the function of sending the SRS after determining the transmission beam of the SRS resource in 304. The relationship determination unit 701 may perform the functions of applying RRC configuration in 501 and 502, applying MAC CE configuration in 503, and determining the transmission beam of the SRS resource in 504; the sending unit 702 may perform the function of sending the SRS after determining the transmission beam of the SRS resource in 504.

[0179] The above communication device further includes: a receiving unit 703, configured to receive configuration information sent by an access device before the relationship determination unit 701 determines a spatial relationship based on a downlink reference signal, where the configuration information is used to configure the status of one or more TCIs.

[0180] The above receiving unit 703 may be an interface or a hardware entity for communication between the terminal device and the access device, or may be the communication interface of the chip described above; when the receiving unit 703 is the communication interface of the chip, the configuration information received by the receiving unit 703 may be sourced from a forwarding device between the access device and the receiving unit 703, and is forwarded by the radio frequency module of the terminal device or other hardware entities having communication with the access device. Corresponding to the method embodiments, the receiving unit 703 may perform the functions of receiving RRC configuration in 501 and 502 and receiving MAC CE signaling in 503.

[0181] Each of the embodiments described herein may be an independent solution or may be combined according to internal logic, and all these solutions fall within the protection scope of this application.

[0182] It can be understood that in the above method embodiments, the methods and operations implemented by the terminal device may also be implemented by components (such as chips or circuits) available for the terminal device, and the methods and operations implemented by the network device (access device or base station) may also be implemented by components (such as chips or circuits) available for the network device.

[0183] The above mainly introduced the solution provided by the embodiments of the present application from various interaction perspectives. It can be understood that each network element, such as a transmitting device or a receiving device, includes corresponding hardware structures and / or software modules for implementing the above functions. Those skilled in the art should be able to realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0184] The embodiments of the present application can divide the functional modules of the transmitting device or the receiving device according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there can be other division methods in actual implementation. The following takes the example of dividing each functional module corresponding to each function for illustration.

[0185] The embodiments of the present application also provide a communication device, such as Figure 8 shown, including: a processor 801, a memory 802, and a transceiver 803;

[0186] More specifically, among them, the processor 801 can correspond to the function of the relationship determination unit 701 in the structure shown in Figure 7 shown, and the specific execution process will not be elaborated in this embodiment. The transceiver 803 can correspond to the functions of the receiving unit 703 and the sending unit 702 in the structure shown in Figure 7 shown, and the specific execution process will not be elaborated in this embodiment.

[0187] The memory 802 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a compact disc read-only memory (CD-ROM). The memory 802 is used for relevant instructions and data. The transceiver 803 is used for receiving and sending data and messages.

[0188] The processor 801 may be one or more central processing units (CPUs). When the processor 801 is a single CPU, it may be a single-core CPU or a multi-core CPU.

[0189] Figure 9 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown in the figure, the communication device 1000 may include a communication unit 1100. Optionally, it may further include a processing unit 1200. The communication unit 1100 can communicate with the outside, and the processing unit 1200 is used for processing, such as determining a beam, determining a radiation intensity, etc. The communication unit 1100 may also be referred to as a communication interface or a transceiver unit. The communication device 1000 may be used to perform the actions executed by the terminal device in the above method embodiments, or the communication device 1000 may be used to perform the actions executed by the network device in the above method embodiments.

[0190] For example: The communication unit may also be referred to as a transceiver unit, including a sending unit and / or a receiving unit, which are respectively used to execute the sending and receiving steps of the network device or the terminal device in the above method embodiments.

[0191] In a possible design, the communication device 1000 can implement the steps or processes corresponding to those executed by the terminal device in the above method embodiments. For example, it may be a terminal device, or a chip or circuit configured in the terminal device. The communication unit 1100 is used to execute the transceiver-related operations on the terminal device side in the above method embodiments, and the processing unit 1200 is used to execute the processing-related operations on the terminal device in the above method embodiments.

[0192] In this embodiment, the processing unit 1200 may execute Figure 3 the functions of applying the RRC configuration in 301 and 302, applying the MAC CE configuration in 303, and determining the transmission beam of the SRS resource in 304 in Figure 5 or the functions of applying the RRC configuration in 501 and 502, applying the MAC CE configuration in 503, and determining the transmission beam of the SRS resource in 504 in

[0193] The communication unit 1100 may execute Figure 3 the function of sending the SRS after determining the transmission beam of the SRS resource in 304 in Figure 5 or the function of sending the SRS after determining the transmission beam of the SRS resource in 504 in

[0194] It should be understood that the specific processes of each unit executing the above corresponding steps have been described in detail in the above method embodiments. For the sake of brevity, they will not be repeated here.

[0195] It should also be understood that the communication unit 1100 in the communication device 1000 can be implemented by the control circuit and the antenna shown in Figure 9 and the processing unit 1200 in the communication device 1000 can be implemented by the processor shown in Figure 9 . When implementing the functions of the processing unit 1200, the processor can be used in cooperation with a memory and input / output devices.

[0196] It should also be understood that if the communication device 1000 is a chip in a terminal device, the communication unit 1100 can also be an input / output interface.

[0197] An embodiment of the present application also provides a processing device, including a processor and an interface. The processor can be used to execute the method in the above method embodiment.

[0198] It should be understood that the above processing device can be a chip. For example, the processing device can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), a micro controller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0199] In the implementation process, the steps of the above method can be completed by the integrated logic circuit in the hardware of the processor or the instructions in software form. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by the hardware processor, or executed and completed by the combination of the hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read only memory, a programmable read only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0200] It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiments may be completed by the integrated logic circuit in the hardware of the processor or instructions in the form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0201] It can be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not be limited to these and any other suitable types of memory.

Claims

1. A method for transmitting a sounding reference signal, characterized in that, it is applied to the case where spatial relation information of uplink transmission resources is not configured, and the method includes: The terminal device determines the spatial relation based on the downlink reference signal; the downlink reference signal is a downlink reference signal that can be received by at least two panels of the terminal device, or the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals; The terminal device transmits the sounding reference signal according to the spatial relation.

2. The method according to claim 1, characterized in that, the downlink reference signal is the downlink reference signal included in the transmission configuration identification (TCI) state in the active state.

3. The method according to claim 1 or 2, characterized in that, the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device includes: When the use of the uplink transmission resource is a codebook and the uplink transmission resource is greater than 1, the downlink reference signal is a downlink reference signal that can be received by at least two panels of the terminal device.

4. The method according to claim 3, characterized in that, the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device includes: If two or more downlink reference signals can be received by at least two panels of the terminal device; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or the downlink reference signal is the downlink reference signal included in the TCI state with the smallest physical downlink control channel (PDCCH) control resource set identification among the two or more downlink reference signals; or the downlink reference signal is a quasi-co-location (QCL) type D downlink reference signal.

5. The method according to claim 1 or 2, characterized in that, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes: When the use of the uplink transmission resource is not a codebook, the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals.

6. The method according to claim 1, characterized in that, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes: If two or more downlink reference signals have the largest number of ports; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or the downlink reference signal is the downlink reference signal included in the TCI state with the smallest physical downlink control channel (PDCCH) control resource set identification among the two or more downlink reference signals, or the downlink reference signal is a quasi-co-location (QCL) type A downlink reference signal.

7. The method according to any one of claims 2 to 6, characterized in that, before the terminal device determines the spatial relation based on the downlink reference signal, the method further includes: The terminal device receives configuration information sent by an access device, and the configuration information is used to configure the status of one or more TCIs.

8. A communication device, characterized in that, comprising: a processing unit, configured to determine a spatial relationship according to a downlink reference signal when spatial relationship information of uplink transmission resources is not configured; the downlink reference signal is a downlink reference signal that can be received by at least two panels of the communication device, or the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals; a sending unit, configured to send a sounding reference signal according to the spatial relationship.

9. The communication device according to claim 8, characterized in that, the downlink reference signal is a downlink reference signal included in a transmission configuration indicator (TCI) state in an active state.

10. The communication device according to claim 8 or 9, characterized in that, the downlink reference signal being a downlink reference signal that can be received by at least two panels of the communication device includes: when the use of the uplink transmission resource is a codebook and the uplink transmission resource is greater than 1, the downlink reference signal is a downlink reference signal that can be received by at least two panels of the communication device.

11. The communication device according to claim 10, characterized in that, the downlink reference signal being a downlink reference signal that can be received by at least two panels of the communication device includes: if two or more downlink reference signals can be received by at least two panels of the communication device; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or the downlink reference signal is the downlink reference signal included in the TCI state with the smallest physical downlink control channel (PDCCH) control resource set identifier among the two or more downlink reference signals; or the downlink reference signal is a quasi-co-location (QCL) type D downlink reference signal.

12. The communication device according to claim 8 or 9, characterized in that, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes: when the use of the uplink transmission resource is non-codebook, the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals.

13. The communication device according to claim 8, characterized in that, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes: if two or more downlink reference signals have the largest number of ports; then the downlink reference signal is the downlink reference signal with the best quality, the most recently used, the most recently measured, or the most recently reported among the two or more downlink reference signals, or the downlink reference signal is the downlink reference signal included in the TCI state with the smallest physical downlink control channel (PDCCH) control resource set identifier among the two or more downlink reference signals, or the downlink reference signal is a quasi-co-location (QCL) type A downlink reference signal.

14. The communication device according to any one of claims 9 to 13, wherein, the communication device further comprises: a receiving unit, configured to receive configuration information sent by an access device before the processing unit determines a spatial relationship based on a downlink reference signal, where the configuration information is used to configure the status of one or more TCIs.

15. A communication apparatus, wherein, it comprises a processor, a memory, and a transceiver; the transceiver is configured to receive or transmit signals; the memory is configured to store program code; the processor is configured to call the program code from the memory to execute the method according to any one of claims 1 to 7.

16. A communication apparatus, wherein, it comprises: a processor, when the processor calls a computer program in a memory, the method according to any one of claims 1 to 7 is executed.

17. A communication apparatus, wherein, it comprises: a memory and a processor; the memory is used to store a computer program, and when the processor calls the computer program in the memory, the communication apparatus executes the method according to any one of claims 1 to 7.

18. A computer-readable storage medium, wherein, the computer-readable storage medium comprises instructions, and when the instructions run on a computer, the computer is caused to execute the method according to any one of claims 1 to 7.

19. A computer program product, wherein the computer program product comprises a computer program or instructions, and when the computer program or instructions run on a computer, the computer is caused to execute the method according to any one of claims 1 to 7.

Images