WO2021062810A1

WO2021062810A1 - Method for sending sounding reference signal, and related product

Info

Publication number: WO2021062810A1
Application number: PCT/CN2019/109736
Authority: WO
Inventors: 管鹏; 陈雷; 张希
Original assignee: 华为技术有限公司
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-04-08
Also published as: CN114451036A

Abstract

A method for sending a sounding reference signal and a related product, being applied to the case where no spatial relation information of uplink transmission resources is configured. Said method comprises: a terminal device determining a spatial relation according to 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 a downlink reference signal having the greatest number of ports among optional downlink reference signals; and the terminal device sending the sounding reference signal according to the spatial relation. The present invention reduces the amount of signaling sent by an access device, and improves the accuracy of channel estimation, improving the communication performance.

Description

Sending method of sounding reference signal, and related products

Technical field

This application relates to the field of communication technology, and in particular to a method for sending sounding reference signals and related products.

Background technique

In order to reduce the high-frequency path loss, the communication between the base station and the terminal equipment uses the antenna gain brought by the analog beam. The analog beam is directional. The main lobe direction and 3dB beam width can be used to describe an analog beam pattern. The narrower the beam width, the greater the antenna gain. The base station and terminal equipment can send and receive signals in a specific direction. Take the following 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 realized when the sending direction of the base station is aligned with the receiving direction of the terminal device. According to the agreement framework of the third generation partnership project (3GPP), the direction of the receiving beam and the sending beam of the terminal device depends on the base station to provide beam indication information.

A sounding reference signal (sounding reference signal, SRS) is an uplink channel sounding signal, which is sent by a terminal device and received by a base station. The time-frequency resources, transmission beams, and transmission power used to transmit SRS are configured by the base station for the terminal equipment. However, if the base station performs resource configuration for each SRS sent by the terminal device, and the transmission beam needs to be reconfigured due to changes in the positions of the base station and the terminal, much signaling will be consumed. If the spatial relation information (spatial relation info) is not explicitly configured, the downlink reference signal (DL RS) contained in the transmission configuration indicator (TCI) of the control channel is used as a reference to send the SRS.

However, the terminal device uses the downlink reference signal contained in the TCI of the control channel as a reference to send the SRS, and the base station cannot receive it correctly, which results in the base station being unable to perform correct channel estimation based on the SRS, resulting in low communication performance.

Application content

The embodiments of the present application provide a method for sending sounding reference signals and related products, which are used to reduce the amount of signaling sent by an access device, improve the accuracy of channel estimation, and improve communication performance.

On the one hand, an embodiment of the present application provides a method for sending sounding reference signals, which is applied to a situation where the spatial relationship information of uplink transmission resources is not configured. The method includes: a terminal device determines a spatial relationship according to a downlink reference signal; the downlink reference The 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 a downlink reference signal with the largest number of ports among the selectable downlink reference signals; the terminal device depends on the spatial relationship Send sounding reference signal.

The aforementioned sounding reference signal is an uplink channel sounding signal, which is sent by the terminal device and received by the access device. The transmission method of SRS, including time-frequency resources, transmission beam, transmission power, etc., is configured by the access device for the terminal device. In the 3GPP R15 protocol framework, the access device can configure one or more SRS resource sets (SRS resource sets) for terminal devices, and each SRS resource set has one or more SRS resources (SRS resources). In addition, in 3GPP R15, different SRS resource sets undertake different functions. R15 supports a total of six functions: {beammanagement, codebook, noncodebook, antenna switching, positioning, mobility} which translates to {beam management, codebook, non-codebook, Antenna switching, positioning, mobility}, the base station configures the usage (usage) of each set through resource control (radio resource control, RRC) to notify the terminal of the function of the SRS resource set. The first four functions can be abbreviated as {BM,CB,NCB,AS}.

The above-mentioned uplink transmission resources are resources used for sending sounding reference signals. 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 one or several SRS resources used to send SRS, and it can be considered that there is no spatial relationship information configured for uplink transmission resources. The aforementioned downlink reference signal is a downlink reference signal sent by the access device to the terminal device, and more specifically may be a downlink reference signal included in the TCI state sent by the access device to the terminal device.

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

The above spatial relationship can correspond to the default spatial relationship introduced in the preceding paragraph, which is used to indicate the transmission direction of the transmission beam for sending the SRS; if the downlink reference signal can be received by the terminal device, the terminal device uses the beam for receiving the downlink reference signal When the sounding reference signal is sent, the base station can receive the SRS sent by the above-mentioned terminal device in a direction aligned with the sending direction of the downlink reference signal. The sending of the sounding reference signal by the terminal device according to the spatial relationship includes: the terminal device sending the sounding reference signal according to a sending direction corresponding to the spatial relationship.

In this embodiment, the optional downlink reference signal refers to the downlink reference signal that can be selected as a reference for the spatial relationship of the sounding reference signal; there may be one or more than one optional downlink reference signal; in the optional downlink reference signal In the case of one signal, the downlink reference signal is the downlink reference signal with the largest number of ports among the optional downlink reference signals; if there is more than one downlink reference signal that can be selected for use, it conforms to the requirements that can be used by the terminal device. At least two panels are required to receive, or if the number of ports is the largest, one of the downlink reference signals can be arbitrarily selected. The above-mentioned panel refers to the receiving antenna panel of the terminal device.

After the spatial relationship is determined in this embodiment, the problem of improper use of the default spatial relationship in the background art can be solved. Therefore, sending the sounding reference signal can be an optional step for the terminal device.

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

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

Using the sounding reference signal sending method provided in the embodiment of the application, if the downlink reference signal can be received by at least two panels of the terminal device, the sounding reference signal sent by the at least two panels determines the spatial relationship according to the downlink reference signal , It can also be received by the access device; or, if you choose a downlink reference signal with a larger number of ports, you can support high-performance multi-stream transmission, so communication performance can be improved.

In addition, in this embodiment, if the reference signal is received or cannot be received, it can be understood that the energy of the reference signal reaching the receiver of the receiver is greater than the threshold or less than the threshold.

In an optional implementation manner, the downlink reference signal is a downlink reference signal included in the TCI state of the transmission configuration number in the active state.

In this embodiment, the TCI status can be notified by the access device to the terminal device; in the case that the TCI status is active, the terminal device uses the beam that receives the downlink reference signal contained in the active TCI status to send the sounding reference signal , To ensure that the access device receives it.

In an optional implementation manner, that the downlink reference signal is a downlink reference signal that can be received by at least two panels of the terminal device includes: in the case where the use of the uplink transmission resource is a codebook, 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.

When the usage of the uplink transmission resource is a codebook, it can be that the access device configures the usage of sending the SRS resource set as a codebook, and the uplink transmission resource greater than 1 can be the number of SRS resources in the above SRS resource set. The number of is greater than 1. If the number of SRS resources in the SRS resource set is 2, then two panels can transmit on these two SRS resources, which can ensure that the sounding reference signal can be correctly received by the access device.

If the spatial relationship information of the uplink transmission resource is not configured, and the associated CSI-RS (associated CSI-RS) is configured, the above-mentioned associated CSI-RS may also be used to determine the spatial relationship.

In an optional implementation manner, that the downlink reference signal is a downlink reference signal that can be received by at least two panels of the terminal device includes:

If it contains two or more downlink reference signals that can be received by at least two panels of the terminal device; then the downlink reference signal is the best quality and the most recent one among the two or more downlink reference signals The downlink reference signal used once, last measured or reported last time, 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 quasi-co-location (quasi-co-location, QCL) type D downlink reference signal.

In this embodiment, the downlink reference signal only needs to be able to be received 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 second-best or non-worst downlink reference signal of the two or more downlink reference signals; the latest downlink reference signal can also be replaced with the non-recent downlink reference signal. Other downlink reference signals; the smallest identification can also be replaced with the smallest non-identification, such as the next smallest or the downlink reference signal contained in other TCI states that are not the largest identification. Other settings are similar to this and will not be repeated. Therefore, the further restriction on the downlink reference signal in this embodiment should not be understood as a unique restriction on this embodiment.

In addition, in this embodiment, it is also possible to first select the downlink reference signal of the QCL type D, and then select the downlink reference signal that can be received by at least two panels of the terminal device from the selected downlink signals, if there are still multiple qualified ones For the downlink reference signal, then the downlink reference signal can be further selected according to the selection method of this embodiment.

In an optional implementation manner, 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 downlink reference signals can be selected.

In the case that the use of the uplink transmission resource is not a codebook, there is no predefined precoding matrix (precoder), that is, there 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 equipment itself performs channel estimation according to the downlink reference signal, and determines the precoding matrix for uplink transmission. If the downlink reference signal with a large number of ports is selected as the reference to send the sounding reference signal, the terminal device has a greater probability of measuring the high-rank channel, and the calculated precoding matrix for uplink transmission can support multi-stream uplink transmission. Improve the performance of uplink transmission.

In an optional implementation manner, the downlink reference signal being the downlink reference signal with the largest number of ports among the optional downlink reference signals includes:

If the number of ports containing two or more downlink reference signals is the largest; then the downlink reference signal is the best quality, the most recent use, the most recent measurement, or the most recent among the two or more downlink reference signals. The downlink reference signal reported at one time, or, the downlink reference signal is the downlink reference signal contained 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 downlink reference signal with a quasi-co-located QCL type A.

In this embodiment, it is sufficient that the number of downlink reference signals meets the maximum 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 the special setting, This is explained in the previous article, so I won't repeat it here.

In addition, in this embodiment, it is also possible to first select the downlink reference signal of QCL type A, and then select the downlink reference signal that can be received by at least two panels of the terminal equipment from the selected downlink signals. If there are still multiple qualified ones, For the downlink reference signal, then the downlink reference signal can be further selected according to the selection method of this embodiment.

In an optional implementation manner, before the terminal device determines the spatial relationship according to 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 a Or the status of multiple TCIs. This embodiment provides a specific implementation method for the terminal device to obtain the status of TCI. If the TCI status is configured by other devices, such as a base station controller or other devices, it will not affect the implementation of this embodiment. Therefore, the embodiment of this application does not provide specific configuration methods. Make uniqueness restrictions.

In an optional implementation manner, the terminal device receiving the configuration information sent by the access device includes: the terminal device receiving the medium access control-control element (MACCE) sent by the access device Signaling. This embodiment provides specific signaling for configuration information. The configuration information can be carried in the MAC CE to specify the TCI state of the activated state. The specific signaling design is described in detail in the subsequent embodiments.

In an optional implementation manner, before the terminal device receives the configuration information sent by the access device, the method further includes: the terminal device receives the resource control RRC configuration sent by the access device, and the RRC The configuration usage is a collection of codebook SRS resources and a collection of TCI status; or, the RRC configuration usage is a collection of non-codebook SRS resources, and a collection of TCI status; the uplink transmission resources are SRS resources . This embodiment provides specific means for terminal equipment to obtain uplink transmission resources and specific content of uplink transmission resources, which is compatible with 3GPP R15. In actual applications, the access device uses other signaling or messages to inform the terminal device of the available uplink transmission resources, and does not affect the implementation of the embodiments of this application. Therefore, the examples in this embodiment should not be construed as unique to the embodiments of this application. Sexual limitation.

In the second aspect, an embodiment of the present application also provides a communication device, including:

The relationship determining unit is configured to determine the spatial relationship according to the downlink reference signal when 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 a downlink reference signal with the largest number of ports among the selectable downlink reference signals;

The sending unit is configured to send sounding reference signals according to the spatial relationship.

In this embodiment, the content executed by the relationship determining unit can refer to the description in the foregoing embodiment of the first aspect, which will not be repeated here. The various possible implementation manners provided in the first aspect may also be applied to the relationship determining unit of this embodiment, and this embodiment will not repeat them.

The communication device in this embodiment may be a terminal device or a chip in a terminal device; wherein 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, The sending unit can be a communication port of the chip, or a hardware entity with a sounding reference signal sending function, such as a radio frequency module of a terminal device.

In an optional implementation manner, the communication device further includes: a receiving unit, configured to receive configuration information sent by the access device before the relationship determining unit determines the spatial relationship according to the downlink reference signal, and the configuration information is used for To configure the status of one or more TCIs.

The above receiving unit may be the interface or hardware entity for communication between the terminal device and the access device, or the communication interface of the chip mentioned above; in the case that the receiving unit is the communication interface of the chip, the configuration information received by the receiving unit may be It is the forwarded configuration information sent by the access device, but is forwarded by the radio frequency module of the terminal device or other hardware entities that communicate with the access device.

In the third aspect, the embodiments of the present application also provide a communication device, including: a processor, a memory, and a transceiver;

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 sounding reference signals according to the spatial relationship.

In a fourth aspect, the embodiments of the present application also provide a communication device, including a processor, a memory, and a transceiver;

The transceiver is used to receive signals or send signals;

The memory is used 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 the embodiments of the present application.

In a fifth aspect, an embodiment of the present application further provides a communication device, including a processor, and when the processor invokes a computer program in the memory, the method according to any one of the embodiments of the present application is executed.

In the sixth aspect, the embodiments of the present application also provide 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 Perform any of the methods provided in the embodiments of the present application.

In the seventh aspect, the embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium includes instructions that, when the instructions run on a computer, cause the computer to execute any item provided in the embodiments of the present application. The method described.

In an eighth aspect, the embodiments of the present invention also provide a computer program product. The computer program product includes a computer program or instruction. When the computer program or instruction runs on a computer, the computer executes the Any of the methods.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the following describes the drawings used in the embodiments of the present application or the background art.

Figure 1 is a schematic diagram of the system structure of an embodiment of the application;

FIG. 2 is a schematic diagram of receiving and sending signals on two panels of a terminal according to an embodiment of the application;

FIG. 3 is a schematic diagram of the method flow of an embodiment of this application;

FIG. 4 is a schematic diagram of the format of MAC CE signaling according to an embodiment of the application;

Fig. 5 is a schematic flow diagram of a method according to an embodiment of the application;

FIG. 6 is a schematic diagram of the format of MAC CE signaling according to an embodiment of the application;

FIG. 7 is a structural intention of a communication device according to an embodiment of the application;

FIG. 8 is a structural intention of a communication device according to an embodiment of the application;

FIG. 9 is a structural diagram of a communication device according to an embodiment of the application.

Detailed ways

The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

Before introducing this embodiment, the technical terms involved in the embodiment of this application are described as follows:

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

Beam management resources: Refers to resources used for beam management, which can also be embodied as resources used for calculating and measuring beam quality. The beam quality includes layer 1 reference signal received power (layer 1 reference signal received power, L1-RSRP), layer 1 reference signal received quality (layer 1 reference signal received quality, L1-RSRQ), etc. Specifically, beam management resources may 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. .

Beam indication information: used to indicate the beam used for transmission, including the sending beam and/or the receiving beam. Including beam number, beam management resource number, uplink signal resource number, downlink signal resource number, absolute index of beam, relative index of beam, logical index of beam, index of antenna port corresponding to beam, index of antenna port group corresponding to beam, The index of the downlink signal corresponding to the beam, the time index of the downlink synchronization signal block corresponding to the beam, the beam pair link (BPL) information, the transmission parameter (Tx parameter) corresponding to the beam, and the reception parameter (Rx parameter) corresponding to the beam , The transmission weight corresponding to the beam, the weight matrix corresponding to the beam, the weight vector corresponding to the beam, the reception weight corresponding to the beam, the index of the transmission weight corresponding to the beam, the index of the weight matrix corresponding to the beam, the index of the weight vector corresponding to the beam, the beam At least one of the index of the corresponding reception weight, the reception codebook corresponding to the beam, the transmission codebook corresponding to the beam, the index of the reception codebook corresponding to the beam, and the index of the transmission codebook corresponding to the beam. The downlink signal includes a synchronization signal, Broadcast channel, broadcast signal demodulation signal, channel state information downlink signal (channel state information reference signal, CSI-RS), cell specific reference signal (CS-RS), terminal specific reference signal (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 of a medium uplink random access sequence, an uplink sounding reference signal, an uplink control channel demodulation reference signal, an uplink data channel demodulation reference signal, and an uplink phase noise tracking signal. Optionally, the network device may also allocate QCL identifiers to beams having a QCL relationship among the beams associated with the frequency resource group. The beam may also be referred to as a spatial transmission filter, the transmitting beam may also be referred to as a spatial transmitting filter, and the receiving beam may also be referred to as a spatial receiving filter. The beam indication information may also be embodied as TCI. The TCI may include various parameters, such as cell number, bandwidth part number, reference signal identifier, synchronization signal block identifier, QCL type, and so on.

Quasi-co-location (QCL): A quasi-co-location relationship is used to indicate that multiple resources have one or more identical or similar communication characteristics. For multiple resources with a quasi-co-location relationship, the same or similar can be used Communication configuration. For example, if two antenna ports have a co-location relationship, then the large-scale characteristics of the channel transmitting one symbol on one port can be inferred from the large-scale characteristics of the channel transmitting one symbol on the other port. Large-scale characteristics can include: delay spread, average delay, Doppler spread, Doppler shift, average gain, receiving parameters, terminal device receiving beam number, transmitting/receiving channel correlation, receiving angle of arrival, receiver antenna Spatial correlation, main angle of arrival (angel-of-arrival, AoA), average angle of arrival, expansion of AoA, etc.

Spatial QCL: Spatial QCL can be considered as a type of QCL. There are two angles to understand spatial: from the sending end or from the receiving end. From the perspective of the transmitting end, if the two antenna ports are quasi-co-located in the spatial domain, it means that the corresponding beam directions of the two antenna ports are spatially consistent, that is, the spatial filters are the same. From the perspective of the receiving end, if the two antenna ports are spatially quasi-co-located, it means that the receiving end can receive the signals sent by the two antenna ports in the same beam direction, that is, the reception parameter QCL.

Beamforming technology can achieve higher antenna array gain by oriented in a specific direction in space. Analog beamforming can be achieved through radio frequency. For example, a radio frequency link (RF chain) adjusts the phase through a phase shifter to control the change of the analog beam direction. Therefore, an RF chain can shoot an analog beam at the same time.

Antenna panel (Panel):

The antenna panel in the embodiments of the present application may be referred to as a panel. Each antenna panel can be configured with one or more receive beams and one or more transmit beams. Therefore, the antenna panel can also be understood as a beam group. Communication equipment, such as terminal equipment or network equipment, can receive signals through the receiving beam on the antenna panel, or send signals through the transmitting beam on the antenna panel.

Specifically, the network device and the terminal device communicate through an antenna, that is, the terminal device and the network device use the antenna to receive and send signals. Both terminal equipment and network equipment have antenna elements. Multiple antenna units can be integrated on a panel. This panel integrated with the antenna unit is called an antenna panel (it can also be represented by a 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.

The antenna panel can also be expressed as an antenna array or an antenna subarray. One antenna panel may include one or more antenna arrays (antenna sub-arrays). 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 RF link or multiple RF links. The radio frequency link can also be called a receiving channel and/or a sending channel, a receiver branch, and so on. Therefore, the antenna panel can also be replaced with a radio frequency link or multiple radio frequency links driving one antenna panel or one or more radio frequency links controlled by a crystal oscillator.

The antenna panel can also be a logical concept. An antenna panel can be a logical entity (that is, it does not reflect the physical antenna structure), such as a collection of antenna ports, or a collection of transmitting and/or receiving beams, or a transmission and/or The collection of receiving directions.

In the subsequent embodiments, the base stations are all described by taking the base station as an example, which will not be described in detail later. As shown in Figure 1, a schematic diagram of the application system of the embodiment of this application, including a base station and terminal equipment. The base station and terminal equipment send data or signaling to each other by sending beams; as mentioned above, the 3GPP R15 protocol framework The configuration of the SRS transmission method includes an indication of the transmission beam. For the terminal device, the transmission beam is an uplink beam, so it is also called an indication of an uplink beam. The uplink beam indication method is specifically:

In 3GPP R15, the transmission beam of SRS resources is indicated by SRS-SpatialRelationInfo. The SRS-SpatialRelationInfo contains a reference signal (referenceSignal), which can be a downlink signal such as a synchronization signal/physical broadcast signal block (synchronization signal/Physical broadcast channel block, SS/PBCH block or SSB) or a channel status information reference signal (channel status information reference) signal, CSI-RS), or the uplink signal SRS. When the referenceSignal is a downlink reference signal, the terminal device uses the transmission beam corresponding to the reception beam receiving the downlink reference signal to transmit the SRS. When the referenceSignal is an uplink reference signal, the terminal equipment should use the base station to transmit the SRS transmission beam to transmit the SRS to be transmitted by the terminal equipment. The contents of SRS-SpatialRelationInfo are as follows:

In the above SRS-SpatialRelationInfo, 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 portion of the bandwidth. Wherein, the cell may be the serving cell of the terminal. The serving cell is described by the higher layer from the perspective of resource management or mobility management or service unit. The coverage of each network device can be divided into one or more serving cells, and the serving cell can be regarded as consisting of certain frequency domain resources, that is, one serving cell can include one or more carriers. The concept of 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 frequency spectrum, and is used to carry communication data between network devices and terminals. The downlink carrier can be used for downlink transmission, and the uplink carrier can be used for uplink transmission. In addition, a carrier may include one or more bandwidth parts. It should be noted that if one cell includes one carrier, then one carrier can be regarded as an independent cell regardless of the physical location. That is, the carrier can be equivalently replaced with the cell. Bandwidth part (BWP) can be called carrier bandwidth part, subband bandwidth, narrowband bandwidth, or other names. For ease of description, the following embodiments take BWP as an example Note, but this application does not limit this.

The transmission beam of the physical uplink control channel (PUCCH) is indicated by PUCCH-SpatialRelationInfo, which can be referred to SRS-SpatialRelationInfo, which will not be repeated here.

Based on the above description, if you configure the transmission beam for each SRS resource, the signaling overhead will be very large due to the large number of SRS resources; moreover, when the transmission beam of the SRS resource is changed, signaling is required to inform the terminal device to change the SRS resource. The beam is transmitted, so the signaling overhead is high. In order to solve this problem, if the default uplink transmission beam is used, that is, when the spatial relation information (spatial relation info) is not configured, the terminal device uses the default spatial relation (spatial relation). The content of the default spatial relationship may include: the default TCI state or quasi-co-location (QCL) assumption of the PDSCH, the activated TCI state of the PDCCH control resource set (CORESET), and the path loss estimation reference signal .

As explained above, SRS can divide different SRS resource sets according to functions to undertake different functions. R15 supports four functions: {beammanagement, codebook, noncodebook, antennaswitching}. The base station configures the purpose of each SRS resource set through RRC. Notify the terminal equipment of the function of the SRS resource set. Use SRS resources configured as codebook or noncodebook for 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 (precoding matrix, or 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 for specific descriptions of codebook (CB) or non-codebook (noncodebook, NCB) and the reasons and solutions that using the default spatial relationship in the two aspects will reduce the performance of PUSCH.

1. The use of SRS resources is CB:

The use is the SRS resource of CB. The base station performs channel estimation and measurement based on the SRS sent by the terminal equipment, and then calculates the precoding matrix (precoder) used by the terminal equipment, and informs the terminal equipment when scheduling uplink data transmission (ie scheduling PUSCH) Send the precoding matrix indicator (Transmit Precoding Matrix Indicator, TPMI). The set of precoders is predefined by the protocol (that is, a set of codebooks), and which one or more precoders can be used can be determined by instructing 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 a maximum of two SRS resources for an SRS resource set whose usage is the codebook, and one transmit panel for the terminal device. The first SRS resource is used to send the SRS, and the other sending panel uses the second SRS resource to send the SRS. The base station obtains the channel conditions from the different transmitting antenna panels of the terminal equipment to the base station by measuring the two SRS received. When scheduling the PUSCH, the base station also informs the terminal equipment of SRS resource indicator (SRI) information; the terminal equipment determines the transmit antenna panel through the SRI indication, and then determines which one or more precoders to use through the TPMI indication.

Assuming that the spatial relation info of SRS is not configured, the default spatial relation comes from a specific TCI state, for example: PDSCH default TCI state or PDCCH CORESET activated TCI state. There will be the following problem: if the downlink reference signal provided in the TCI state cannot be received by multiple panels of the terminal device at the same time, when the terminal device uses this TCI state as the spatial relation for sending SRS, the base station cannot receive the SRS sent by some panels . This is because, based on the reciprocity of the uplink and downlink channels, the SRS sent by the panel that cannot receive the downlink reference signal cannot be received by the base station.

As shown in Figure 2, Figure 2 illustrates layers, antenna ports (antenna ports), transceiver units (transceiver units, RRU), and antenna elements (antenna elements). It also illustrates three data sending stages: analog beamforming, digital beamforming, and precoder. Among them, TCI status #1 can provide information about the downlink reference signal, for example, downlink reference signal 1 (DL RS#1). Under the condition that the transmission and reception channels are consistent, the receiving beam determined by the terminal device according to DL RS#1 can be used as the transmission The beam reference, 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 whose usage is CB, TCI status #1 can be used as a reference for determining SRS#1 spatial relation. However, if there are 2 SRS resources in an SRS resource set whose usage is CB, TCI status #1 cannot be used as a reference for determining the spatial relation of SRS#2, because DL RS#1 is not received on the 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.

Based on the above description, if you do not consider whether multiple panels of the terminal device can receive the downlink reference signal when sending the SRS, it may happen that some panels of the terminal device cannot receive the downlink reference signal, and accordingly the SRS sent by this part of the panel Nor can it be received by the base station. This embodiment provides the scenario of SRS resource set for CB, assuming that two sounding reference signal resources (SRS resources) are configured, and the default spatial relation follows (follow) including multiple panels that can be used by the UE at the same time. The specific implementation of the received downlink reference signal (DL RS) transmission configuration number statement (TCI state) is as follows:

Before or during the execution of all the steps performed in this embodiment, the base station and the terminal device will continuously perform beam training through the transmission, measurement and feedback of the reference signal, which will not be repeated in the subsequent embodiments.

In the downlink communication process, the base station continuously sends SSB or channel status information reference signal (channel status information reference signal, CSI-RS), and the terminal equipment measures the reception quality of the SSB or CSI-RS sent by the base station and sends the corresponding information Including: SSB index or CSI-RS resource ID, and the corresponding layer 1 reference signal receiving power (L1-RSRP) feedback to the base station, so that the base station can select a better quality beam pair for data channel or control The transmission of the channel also enables the base station to correctly configure the beam indication information, which is used to instruct the terminal equipment to receive the correct data channel or control channel.

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

The specific process shown in Figure 3 includes:

301: The base station indicates an SRS resource set used for codebook-based UL transmission through the RRC configuration. Correspondingly, the terminal device receives the RRC and applies the RRC configuration.

The configuration of the SRS resource set includes the following resource set-level configuration:

1. Usage (usage): indicates the usage of the SRS resource collection, which is codebook in this embodiment;

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

3. Power control parameters: including reference power P0, path loss compensation parameter alpha, path loss estimation reference signal, power accumulation parameters, etc.

In addition, one SRS resource set can include one or more SRS resources, and the following resource-level configurations:

4. Time-frequency resource pattern (pattern);

5. Sequence;

6. Frequency hopping pattern.

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

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

In this step, the base station can configure multiple TCI states using RRC signaling, for example: use the following signaling to configure a PDSCH TCI state list.

tci-StatesToAddModList SEQUENCE(SIZE(1..maxNrofTCI-States))OF TCI-State//TCI add list state sequence (size (1..max Nrof transmission configuration number state)) TCI state

tci-StatesToReleaseListSEQUENCE(SIZE(1..maxNrofTCI-States))OF TCI-StateId//TCI release list state sequence (size (1..max Nrof transmission configuration number state)) TCI state identifier

In this step, the base station can configure multiple PDSCH TCI states using RRC signaling. For example, use the following signaling to configure a PDCCH TCI state list.

tci-StatesPDCCH-ToAddList and tci-StatesPDCCH-ToReleaseList; reference usage is the same as the PDSCH TCI state list. The PDCCH TCI list may be the same as or different from the PDSCH TCI list, which is not limited in this embodiment.

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 MAC CE signaling configuration.

The base station uses MAC CE signaling to activate one or more TCI states, for example, the signaling shown in FIG. 4 is used.

Among them, Ti represents the i-th TCI state configured in RRC, Ti=1 means that the i-th TCI state is activated, and Ti=0 means that the i-th TCI state is deactivated. The base station sends the above-mentioned MAC CE to configure a list of activated TCI states for the terminal device. Octal (Octal number system, oct) 1 to N means that each row has 8 bits. The MAC CE shown in Figure 4 above is the UE-level PDSCH TCI state activation and deactivation MAC CE signaling (TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)

In addition, the above MAC CE may also be a UE-level PDCCH TCI state indication MAC CE (UE-specific PDCCH TCI state indication).

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

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.

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 reference signal information contained in these activated TCI states. The reference signal included in the TCI state is a downlink signal, so it is also called a downlink reference signal included in the TCI state.

If there is a TCI state activated in 303, the TCI state can be used as a reference for SRS resource transmission beams. If multiple TCI states are activated in 303, then one TCI state can be selected as the reference for the SRS resource transmission beam. The reference referred to in this embodiment, the specific reference manner may be: according to the consistency of the transmission beam and the reception beam, the terminal device determines the transmission beam by referring to the reception beam of the downlink reference signal included in the reception TCI state.

The selection method from multiple active TCI states can be: the lowest TCI state identifier, the most recent transmission, the most recent measurement, the most recently reported TCI state, the default TCI state used for downlink communication, and scheduling/triggering SRS transmission The TCI state of the PDCCH, the TCI state of CORESET#0, or the QCL hypothesis, as the TCI state of the path loss estimation reference signal. In addition, the reference signal in the TCI state selected by the terminal device can be simultaneously received by multiple receiving antenna panels of the terminal device. If there are reference signals contained in multiple TCI states that can be received by multiple receiving antenna panels of the terminal device at the same time, the terminal device selection method can follow the following principles:

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

Option 2: The lowest TCI status identifier/reference signal identifier, the most recent transmission, the most recent measurement, and the most recent report;

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

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

The above QCL Type D is defined as: QCL-TypeD: {Spatial Rx parameter spatial reception parameter}

The default TCI state used in the aforementioned downlink communication may be, for example, the default TCI state of the PDCCH or the default TCI state of the PDSCH. Further, it may 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 may be the lowest ID among other CORESETs that do not include CORESET#0.

In this step, when the DL RS in the TCI state can be simultaneously received by multiple antenna panels of the terminal device, the 2 SRS signals sent by the terminal device on the 2 SRS resources can be correctly received by the base station for the base station to estimate the channel And choose the correct TPMI for the terminal device.

305: The base station measures the SRS sent by the terminal equipment.

306: The base station schedules the terminal equipment to send PUSCH, and indicates SRI and TPMI in the scheduling information.

This embodiment ensures that without explicit spatial relation info configuration, the default spatial relation of the terminal device can support that the SRS transmitted by the different transmitting antenna panels of the terminal device can be correctly measured by the base station, thereby improving communication efficiency.

2. The use of SRS resources is NCB:

The difference between NCB-based uplink transmission and CB-based uplink transmission is that the former does not have a precoder or codebook predefined by the protocol. The terminal device calculates the precoder used to send the SRS by itself. The base station can configure multiple SRS resources for the terminal equipment, for example: configure up to 4 SRS resources for a SRS resource set whose usage is nonCodebook, the terminal equipment can determine 4 different precoders to transmit 4 SRS, and the base station measures Determine which SRS is better, and configure the mapping relationship between SRI information and PUSCH DMRS port to the terminal device when scheduling uplink transmission. The terminal equipment uses the downlink signal to perform channel measurement and estimation, and then calculates the precoder for SRS transmission. For example, the SRS resource set whose usage is nonCodebook can be configured with associatedCSI-RS for channel measurement and precoder determination. The embodiments of this application may be applicable to scenarios where neither the spatial relation info nor the associated CSI-RS of the SRS are configured. If the spatial relation info of SRS is not configured, but the associatedCSI-RS is configured, the associatedCSI-RS can be used to determine the spatial relation.

Assuming that the spatial relation info of SRS is not configured, the default spatial relation comes from a specific TCI state, for example: PDSCH default TCI state or PDCCH CORESET activated TCI state; specifically, the terminal equipment estimates the channel based on the downlink reference signal can be abstracted as follows formula:

y=Hx+n;

Among them, y is the signal seen by the receiving end, H is the channel, x is the signal sent by the transmitting end, and n is the noise.

More specifically, HεC ^Nrx×Ncsi is the channel matrix, Nrx is the number of terminal equipment receiving antennas, and Ncsi is the number of downlink reference signal ports.

It is assumed that the uplink and downlink channels are reciprocal, that is, the downlink channel sent by the base station and received by the terminal device is equal to the transposition of the uplink channel received by the terminal device sent by the base station

Then the precoder that the terminal device sends SRS has a matching uplink channel, and the behavior of the base station measuring SRS for NCB can be abstracted as the following formula:

y ^UL =H ^UL V ^UL x ^UL +n ^UL ;

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 sending end, and n is the noise.

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 ^{maximum rank of H UL} is {1,2,4}. When the DL RS is 1 port, the SRS precoder estimated by the UE serves the rank 1 PUSCH.

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

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

The configuration of the SRS resource set can refer to 301 in the previous embodiment, and the differences include:

1. Usage: indicates the purpose of the SRS resource set, which is non-codebook in this embodiment;

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

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

502: The base station configures the TCI state set through RRC. Accordingly, the terminal device receives RRC and applies the RRC configuration.

In this step, the base station can use RRC signaling to configure multiple TCI states. For example, refer to the signaling in the previous embodiment 302 to configure a TCI state list, which will not be repeated here.

In addition, if CSI-RS is sent, qcl-info can be configured to guide terminal equipment to receive CSI-RS.

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

In the previous embodiment, qcl-info in this embodiment can also be used to know that the terminal device is receiving CSI-RS, which will not be repeated here.

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.

For the implementation of configuring the TCI state using MAC CE signaling, refer to Figure 4 and the corresponding description, which will not be repeated here. The base station can also use MAC CE signaling SP CSI-RS resources and indicate the TCI status for each CSI-RS resource. As shown in Figure 6, it actually contains information such as serving cell and BWP ID, among which oct4 to N+4 are used to indicate the status of the TCI status ID.

The set of TCI states in this embodiment may be based on the set of TCI states in the previous embodiment, and further include TCI states configured for CSI-RS resources.

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

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

In this embodiment, the terminal device selects the reference of 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 may have a larger number of ports. If there are reference signals included in multiple TCI states that all have a larger number of ports, the way to select the TCI state from them can refer to the description of 304 above and will not be repeated here.

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

The above QCL-TypeA is defined as: QCL-TypeA: {Doppler shift, Doppler spread, Doppler spread, average delay, delay spread}

Because in this embodiment, the higher the number of DL RS ports in the TCI state, the terminal device can estimate a channel with a higher rank, and then calculate the precoder to support the PUSCH transmission of multiple streams to achieve uplink capacity enhancement , Thereby improving communication capabilities.

505: The base station measures the SRS sent by the terminal equipment.

506: The base station schedules the terminal equipment to transmit the PUSCH, and indicates the SRI and the association relationship between the SRI and the PUSCH DMRS port in the scheduling information.

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

The methods in this embodiment and the previous embodiment are applicable to the case that neither the path loss estimation reference signal nor the transmission beam information is configured.

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

Further, 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 beam for the beam according to the priority from high to low. Managed DL RS.

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

The DL RS used for beam management is the RS used for L1-RSRP reporting; it can also be a resource in a resource set configured with ‘repetition’ (repetition).

In addition, the DL RS used for channel information acquisition may be an RS used for resource indicator (resource indicator, RI)/precoding matrix indicator (precoding matrix indicator, PMI)/CQI reporting. The DL RS used for channel information acquisition may also be a resource in a resource set that is not configured with either'repetition' nor'trs' (tracking function).

Another priority determination method, for example, the DL RS used for beam management has higher priority than the DL RS used for time-frequency tracking, and higher than the RS used for synchronization.

Among them, the DL RS used for time-frequency tracking may be a resource in a resource set configured with "trs"; the RS used for synchronization may be an SS/PBCH block.

In addition, if the priority is determined based on the four references of QCL Type A B C D, the priority of QCL Type D may be the highest.

Above, the method provided by the embodiment of the present application has been described in detail with reference to FIGS. 1 to 6. Hereinafter, the communication device provided by the embodiment of the present application will be described in detail with reference to FIGS. 7-9. It should be understood that the description of the device embodiment and the description of the method embodiment correspond to each other. Therefore, for the content that is not described in detail, please refer to the above method embodiment. For the sake of brevity, details are not repeated here.

An embodiment of the present application also provides a communication device, as shown in FIG. 7, including:

The relationship determining unit 701 is configured to determine the spatial relationship according to the downlink reference signal when 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 foregoing downlink reference signal is a downlink reference signal with the largest number of ports among the selectable downlink reference signals;

The sending unit 702 is configured to send sounding reference signals according to the above-mentioned spatial relationship.

The communication device in this embodiment may be a terminal device or a chip in a terminal device; wherein, the relationship determining unit 701 may correspond to a chip that performs data processing in the terminal device, and the sending unit 702 may be a communication port of the chip. It can also be a hardware entity with a sounding reference signal sending function, such as a radio frequency module of a terminal device. Corresponding to the foregoing method embodiment, the relationship determining unit 701 can perform the functions of applying RRC configuration in 301 and 302, applying MAC CE configuration in 303, and determining the transmission beam of SRS resource in 304; the sending unit 702 can perform 304 to determine SRS. The function of sending SRS after the resource beam is sent. The relationship determining unit 701 can perform 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; the sending unit 702 can perform 504 determining the transmission beam of the SRS resource and then send the SRS Function.

The above-mentioned communication device further includes: a receiving unit 703, configured to receive configuration information sent by the access device before the above-mentioned relationship determining unit 701 determines the spatial relationship according to the downlink reference signal, where the above-mentioned configuration information is used to configure the state of one or more TCIs.

The above-mentioned receiving unit 703 may be an interface or hardware entity for communication between the terminal device and the access device, or the communication interface of the chip mentioned above; in the case that the receiving unit 703 is the communication interface of the chip, the receiving unit 703 receives The configuration information may originate from the forwarding device between the access device and the receiving unit 703, but is forwarded by the radio frequency module of the terminal device or other hardware entities that have communication with the access device. Corresponding to the method embodiment, the receiving unit 703 can perform the functions of receiving RRC configuration in 501 and 502 and receiving MAC CE signaling in 503

The various embodiments described herein may be independent solutions, or may be combined according to internal logic, and these solutions fall within the protection scope of the present application.

It can be understood that, in the foregoing method embodiments, the methods and operations implemented by terminal devices can also be implemented by components (such as chips or circuits) that can be used for terminal devices, or implemented by network devices (access devices or base stations). The methods and operations can also be implemented by components (such as chips or circuits) that can be used in network devices.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of each interaction. It can be understood that each network element, such as a transmitting end device or a receiving end device, includes hardware structures and/or software modules corresponding to each function in order to realize the above-mentioned functions. Those skilled in the art should be aware that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiments of the present application can divide the transmitting end device or the receiving end device into functional modules according to the foregoing 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. in. The above-mentioned integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation. The following is an example of dividing each function module corresponding to each function.

An embodiment of the present application also provides a communication device, as shown in FIG. 8, including: a processor 801, a memory 802, and a transceiver 803;

More specifically, the processor 801 may correspond to the function of the relationship determining unit 701 in the structure shown in FIG. 7, and the specific execution process of the processing is not described in detail in this embodiment. The transceiver 803 may correspond to the functions of the receiving unit 703 and the sending unit 702 in the structure shown in FIG. 7, and the specific execution process will not be described in detail in this embodiment.

The memory 802 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or Portable read-only memory (compact disc read-only memory, CD-ROM), the memory 802 is used for related instructions and data. The transceiver 803 is used to receive and send data and messages.

The processor 801 may be one or more central processing units (CPU). In the case where the processor 801 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

FIG. 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, and optionally, may also include a processing unit 1200. The communication unit 1100 may communicate with the outside, and the processing unit 1200 is used for processing, such as determining beams, determining radiation intensity, and so on. The communication unit 1100 may also be referred to as a communication interface or a transceiving unit. The communication device 1000 may be used to perform the actions performed by the terminal device in the above method embodiment, or the communication device 1000 may be used to perform the actions performed by the network device in the above method embodiment.

For example, the communication unit may also be called a transceiving unit, and includes a sending unit and/or a receiving unit, which are respectively used to perform the steps of sending and receiving by the network device or the terminal device in the above method embodiment.

In a possible design, the communication device 1000 may implement the steps or processes performed by the terminal device corresponding to the above method embodiment, for example, it may be a terminal device, or a chip or circuit configured in the terminal device. The communication unit 1100 is configured to perform the transceiving-related operations on the terminal device side in the above method embodiment, and the processing unit 1200 is configured to perform the processing related operations on the terminal device in the above method embodiment.

In this embodiment, the processing unit 1200 may perform 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; or, 501 and 502 in FIG. 5 The function of applying RRC configuration in 503, MAC CE configuration in 503, and determining the transmission beam of SRS resources in 504;

The communication unit 1100 may perform the function of transmitting the SRS after determining the transmission beam of the SRS resource at 304 in FIG. 3; or the function of transmitting the SRS after determining the transmission beam of the SRS resource at 504 in FIG. 5.

It should be understood that the specific process of each unit performing the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.

It should also be understood that the communication unit 1100 in the communication device 1000 may be implemented by the control circuit and antenna shown in FIG. 9, and the processing unit 1200 in the communication device 1000 may be implemented by the processor shown in FIG. 9. The processor can be used in conjunction with a memory and an input/output device when implementing the functions of the processing unit 1200.

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

The embodiment of the present application also provides a processing device, including a processor and an interface. The processor may be used to execute the method in the foregoing method embodiment.

It should be understood that the above-mentioned processing device may be a chip. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or It is a central processor unit (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or it can be a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.

In the implementation process, the steps of the above method can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned 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 gates or transistor logic devices, discrete hardware components . The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

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

Claims

A method for sending sounding reference signals, which is characterized in that it is applied to a situation where the spatial relationship information of uplink transmission resources is not configured, and the method includes:

The terminal device determines the spatial relationship according to 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 a selectable downlink reference signal with the largest number of ports ’S downlink reference signal;

The terminal device sends a sounding reference signal according to the spatial relationship.
The method according to claim 1, wherein the downlink reference signal is a downlink reference signal included in the TCI state of the transmission configuration number in the active state.
The method according to claim 1 or 2, wherein the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device comprises:

In the case where the use of the uplink transmission resource is a codebook, the uplink transmission resource is greater than 1, and the downlink reference signal is a downlink reference signal that can be received by at least two panels of the terminal device.
The method according to claim 3, wherein the downlink reference signal being a downlink reference signal that can be received by at least two panels of the terminal device comprises:

If it contains two or more downlink reference signals that can be received by at least two panels of the terminal device; then the downlink reference signal is the best quality and the most recent one among the two or more downlink reference signals The downlink reference signal used for one time, the most recent measurement, or the most recently reported downlink reference signal, or the downlink reference signal is 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 downlink reference signal of quasi-co-located QCL type D.
The method according to claim 1 or 2, wherein the downlink reference signal being the downlink reference signal with the largest number of ports among the selectable downlink reference signals comprises:

In the case where the use of the uplink transmission resource is not a codebook, the downlink reference signal is a downlink reference signal with the largest number of ports among the selectable downlink reference signals.
The method according to claim 1, wherein the downlink reference signal being the downlink reference signal with the largest number of ports among the selectable downlink reference signals comprises:

If the number of ports containing two or more downlink reference signals is the largest; then the downlink reference signal is the best quality, the most recent use, the most recent measurement, or the most recent among the two or more downlink reference signals. The downlink reference signal reported at one time, or, the downlink reference signal is the downlink reference signal contained 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 downlink reference signal with a quasi-co-located QCL type A.
The method according to any one of claims 2 to 6, characterized in that, before the terminal device determines the spatial relationship according to the downlink reference signal, the method further comprises:

The terminal device receives configuration information sent by the access device, where the configuration information is used to configure the state of one or more TCIs.
A communication device, characterized in that it comprises:

A processing unit, configured to determine the spatial relationship according to a downlink reference signal when 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 a downlink reference signal with the largest number of ports among the selectable downlink reference signals;

The sending unit is configured to send sounding reference signals according to the spatial relationship.
The communication device according to claim 8, wherein the downlink reference signal is a downlink reference signal included in the TCI state of the transmission configuration number in the active state.
The communication device according to claim 8 or 9, wherein the downlink reference signal being a downlink reference signal that can be received by at least two panels of the communication device comprises:

In the case where the use of the uplink transmission resource is a codebook, the uplink transmission resource is greater than 1, and the downlink reference signal is a downlink reference signal that can be received by at least two panels of the communication device.
The communication device according to claim 10, wherein the downlink reference signal being a downlink reference signal that can be received by at least two panels of the communication device comprises:

If it contains two or more downlink reference signals that can be received by at least two panels of the communication device; then the downlink reference signal is the best quality and most recent one among the two or more downlink reference signals The downlink reference signal that is used once, measured in the most recent time, or reported in the most recent time, or, the downlink reference signal is 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-located QCL type D downlink reference signal.
The communication device according to claim 8 or 9, wherein the downlink reference signal is the downlink reference signal with the largest number of ports among the selectable downlink reference signals, comprising:

In the case where 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 selectable downlink reference signals.
The communication device according to claim 8, wherein the downlink reference signal is the downlink reference signal with the largest number of ports among the selectable downlink reference signals, comprising:

If the number of ports containing two or more downlink reference signals is the largest; then the downlink reference signal is the best quality, the most recent use, the most recent measurement, or the most recent among the two or more downlink reference signals. The downlink reference signal reported at one time, or, the downlink reference signal is the downlink reference signal contained 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 downlink reference signal with a quasi-co-located QCL type A.
The communication device according to any one of claims 9 to 13, wherein the communication device further comprises:

The receiving unit is configured to receive configuration information sent by the access device before the processing unit determines the spatial relationship according to the downlink reference signal, where the configuration information is used to configure the state of one or more TCIs.
A communication device, characterized in that it comprises a processor, a memory and a transceiver;

The transceiver is used to receive signals or send signals;

The memory is used 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 1-7.
A communication device, comprising: a processor, when the processor calls a computer program in the memory, the method according to any one of claims 1 to 7 is executed.
A communication device, characterized by comprising: 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 claims 1 to 7. The method of any one of.
A computer-readable storage medium, wherein the computer-readable storage medium includes instructions, which when run on a computer, cause the computer to execute the method according to any one of claims 1-7.
A computer program product, characterized in that the computer program product includes a computer program or instruction, and when the computer program or instruction runs on a computer, the computer is caused to execute the method according to any one of claims 1 to 7 .