Sounding reference signal (SRS) transmission method, communication apparatus, and communication device

Abstract

The present application belongs to the field of communications. Disclosed are a sounding reference signal (SRS) transmission method, a communication apparatus, and a communication device. The method in the embodiments of the present application comprises: a terminal acquiring an association relationship between an SRS and a downlink reference signal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set comprises at least one downlink reference signal; on the basis of the downlink reference signal set associated with a target SRS to be sent, the terminal determining precoding information of the target SRS; and the terminal sending the target SRS by using the precoding information.

Description

Transmission method, communication device and communication equipment for detection reference signal (SRS)

[0001] This application claims priority to Chinese Patent Application No. 202410230977.6, filed on February 29, 2024, entitled “Method for transmitting a reference signal SRS, communication apparatus and communication device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, specifically to a method for transmitting a detection reference signal (SRS), a communication device, and a communication equipment. Background Technology

[0003] In related technologies, a Sounding Reference Signal (SRS) can be associated with an Associated Channel State Information Reference Signal (Associated CSI-RS). The terminal can calculate the precoding information of the SRS based on the CSI-RS associated with the SRS, and then transmit the SRS based on the precoding information. The network-side equipment can perform uplink channel measurements based on the SRS and configure appropriate uplink transmission parameters for the terminal according to the measurement results to ensure the uplink transmission performance of the terminal.

[0004] In some scenarios, a terminal supports connecting to multiple Transmission Reception Points (TRPs). These TRPs can perform coherent joint transmission (CJT) and coherent joint reception (CJR) to serve the terminal. In this case, using existing methods for determining precoding information can lead to inaccurate precoding information for the determined SRS, thus affecting uplink transmission performance. Summary of the Invention

[0005] This application provides a method, communication device, and communication equipment for transmitting a sounding reference signal (SRS), which can improve the accuracy of the precoded information of the calculated SRS and ensure uplink transmission performance.

[0006] Firstly, a method for transmitting a detection reference signal (SRS) is provided, the method comprising:

[0007] The terminal obtains the association between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal;

[0008] The terminal determines the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted;

[0009] The terminal uses the precoded information to send the target SRS.

[0010] Secondly, a method for transmitting a detection reference signal (SRS) is provided, the method comprising:

[0011] The network-side device indicates the association between the SRS and the downlink reference signal to the terminal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal;

[0012] The network-side device receives the target SRS sent by the terminal, wherein the precoding information of the target SRS is determined based on the downlink reference signal set associated with the target SRS.

[0013] Thirdly, a communication device is provided, comprising:

[0014] The processing unit is configured to acquire the association relationship between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal; and to determine the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted.

[0015] A communication unit is used to transmit the target SRS using the precoded information.

[0016] Fourthly, a communication device is provided, comprising:

[0017] The transmitting unit is used to indicate to the terminal the association relationship between the SRS and the downlink reference signal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal;

[0018] A receiving unit is configured to receive a target SRS sent by the terminal, wherein the precoding information of the target SRS is determined based on the downlink reference signal set associated with the target SRS.

[0019] Fifthly, a communication device is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect, or implementing the steps of the method as described in the second aspect.

[0020] In a sixth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0021] A seventh aspect provides a wireless communication system, comprising: a terminal and a network-side device, wherein the terminal is configured to perform the steps of the method described in the first aspect, and the network-side device is configured to perform the steps of the method described in the second aspect.

[0022] Eighthly, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0023] In a ninth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to perform the steps of the method as described in the first aspect, or the steps of the method as described in the second aspect.

[0024] In this embodiment, an SRS can be associated with one or more downlink reference signals. The terminal can calculate the precoding information of the target SRS based on the downlink reference signal associated with the target SRS to be transmitted, thereby obtaining more accurate precoding information. Transmitting the target SRS based on the precoding information helps ensure that the network-side device performs accurate uplink channel measurement based on the target SRS, and then configures appropriate uplink transmission parameters to ensure uplink transmission performance. Attached Figure Description

[0025] Figure 1 is a schematic diagram of a communication system provided in an embodiment of this application.

[0026] Figure 2 is a schematic diagram of a non-codebook-based PUSCH transmission process.

[0027] Figure 3 shows a schematic diagram of a flexible duplex mode.

[0028] Figure 4 is a schematic diagram of a method for transmitting a detection reference signal (SRS) according to an embodiment of this application.

[0029] Figure 5 is a schematic diagram of a scenario applicable to an embodiment of this application.

[0030] Figure 6 is a schematic diagram of the mapping relationship between a subarray and a reference signal provided in an embodiment of this application.

[0031] Figure 7 is a schematic diagram of time resources for an SRS resource group configuration or CSI-RS set association provided in an embodiment of this application.

[0032] Figure 8 is a schematic diagram of a communication device provided in an embodiment of this application.

[0033] Figure 9 is a schematic diagram of another communication device provided in an embodiment of this application.

[0034] Figure 10 is a schematic diagram of a communication device provided in an embodiment of this application.

[0035] Figure 11 is a hardware structure diagram of a terminal provided in an embodiment of this application.

[0036] Figure 12 is a hardware structure diagram of a network-side device provided in an embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0038] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, "A or B" covers three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0039] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0040] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0041] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart earphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in the embodiments of this application.

[0042] A terminal can also be called user equipment (UE), terminal device, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device, etc.

[0043] Network-side equipment 12 may include access network equipment or core network equipment. Access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, wireless local area network (WLAN) access points (APs), or wireless Fidelity (WiFi) nodes, etc. The base station may be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmission Reception Point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that the embodiments of this application only use the base station in the NR system as an example for introduction, and do not limit the specific type of base station.

[0044] To facilitate understanding of the embodiments of this application, the transmission process of the Physical Uplink Shared Channel (PUSCH) based on non-codebook is described.

[0045] PUSCH transmission modes include codebook transmission mode and non-codebook transmission mode. Non-codebook based UL transmission refers to the terminal not transmitting PUSCH based on an existing codebook, but instead calculating precoder information based on the associated Channel State Information Reference Signal (associated CSI-RS) and adjusting the PUSCH transmission accordingly.

[0046] Non-codebook PUSCH transmission is typically used in scenarios where uplink and downlink channels are reciprocal, such as Time Division Duplex (TDD) scenarios. The general process involves the terminal calculating the downlink precoded codeword based on downlink CSI-RS measurements and using it for uplink SRS transmission based on the reciprocity of the uplink and downlink channels. The base station selects one or more SRS resources based on the received uplink precoded Sounding Reference Signal (precoded SRS) and notifies the terminal via an SRS resource indicator (SRI). The number of SRI resources is the uplink transmission rank. The terminal then performs PUSCH transmission using the corresponding precoded codeword according to the base station's indication.

[0047] Figure 2 illustrates a non-codebook-based PUSCH transmission process.

[0048] Step 1: The UE reports UE capability information (UeCapabilityInformation), such as the maximum number of layers supported (max layer).

[0049] Step 2: The base station configures an SRS resource set for the UE.

[0050] For example, SRS resource set configuration is achieved via RRC reconfiguration messages. When the usage of the SRS resource set is non-codebook based UL transmission, the UE can be configured with a maximum of four SRS resources (depending on the UE's capabilities). In the Radio Resource Control (RRC) layer SRS resource set group, associated CSI-RS are configured to allow the UE to infer the UL channel from the DL channel, thereby calculating the SRS precoder.

[0051] Step 3: Precoded SRS transmission.

[0052] Step 4: The base station selects appropriate SRS resources based on the SRS received in Step 3, and the rank is the number of SRS resources selected by the base station. The base station notifies the UE of the specific parameters of uplink transmission through Downlink Control Information (DCI), including SRI and Demodulation Reference Signal (DMRS) port.

[0053] Step 5: The UE transmits the PUSCH according to the DCI.

[0054] Cell-free massive MIMO (Multiple-Input Multiple-Output) systems break away from the traditional cell concept in massive MIMO systems. Instead of being deployed at a single macro base station, a large number of antennas are distributed across a wide area, and user units (UEs) can also be distributed across this wide area. These antennas are called TRPs or APs, or can be considered subarrays of a large antenna array on the network side. Theoretically, each UE can communicate with each TRP / subarray. With the help of the fronthaul network and the Central Processing Unit (CPU), a large number of geographically dispersed TRPs can collectively serve a smaller number of UEs. The CPU uses channel statistics for joint detection. This technology holds promise for next-generation indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping malls, stadiums, subways, hospitals, community centers, or university campuses.

[0055] Traditional deployments of multiple TRP networks typically employ TDD transmission mode and assume that the uplink and downlink time slot configurations for each TRP in the network are identical. The network side can determine the uplink and downlink time slot configuration parameters based on the overall uplink and downlink traffic demand within the entire cell-free network.

[0056] In a full-duplex (FD) cell-free architecture, it is assumed that each TRP has different uplink and downlink time slot configurations, and uplink and downlink data transmission can occur within the same time and frequency resources. In this architecture, the uplink and downlink time slot configurations of the TRPs remain unchanged. More flexible UE-oriented full-duplex time slot configurations are achieved by controlling the uplink transmission or downlink reception between the UE and different TRPs, as well as the corresponding quasi-co-located (QCL) relationship for uplink transmission and the TCL relationship for downlink transmission.

[0057] The advantage of this approach is that the terminal can meet any proportion and demand for uplink and downlink transmission by connecting to TRPs with different uplink and downlink time slot configurations. Since the network side does not need to frequently adjust the uplink and downlink time slot configuration of each TRP, it can save network side resource overhead and implementation complexity, thereby reserving more network resources for more comprehensive interference measurement, joint optimization and transmission control.

[0058] The drawback is that cross-link interference (CLI) can occur between different TRPs. Specifically, a TRP in a downlink time slot can cause cross-link interference to a TRP in an uplink time slot at the same time, and a UE in an uplink time slot can cause cross-link interference to a UE in a downlink time slot at the same time. However, considering that the CPU in a cell-free network can control each TRP to achieve relatively accurate CLI measurements, and by optimizing the UE-TRP connection relationship and network-side beamforming, the impact of CLI can be effectively reduced. Furthermore, regarding the interference problem between TRPs, such as interference from TRP1 to TRP2, the base station determines the content of the downlink signal of TRP1. TRP2 receives the downlink signal of TRP1 and, through the reference signals such as DMRS carried within it, can estimate the interference channel situation between TRP1 and TRP2. Through baseband signal processing, the interference of the downlink signal of TRP1 is eliminated from the received signal of TRP2.

[0059] In some scenarios, a flexible duplexing method can be considered: network-side non-overlapping sub-band full duplex (SBFD), where uplink and downlink transmissions can occur simultaneously at different frequency domain locations. To avoid interference between uplink and downlink, a guard band can be reserved between the frequency domain locations (corresponding to duplex sub-bands) for different transmission directions. Terminal-side half-duplex, consistent with TDD, allows only uplink or downlink transmission at any given time; the two cannot occur simultaneously. Understandably, in this duplexing method, the network-side uplink and downlink transmissions at the same time can only be performed for different terminals; that is, the terminal remains in half-duplex mode.

[0060] Figure 3 illustrates a flexible duplex mode. On the network side, within a portion of the downlink symbols, the frequency domain of a single carrier is semi-statically divided into three duplex sub-bands. The two sides of the carrier are downlink duplex sub-bands, and the center is the uplink duplex sub-band, to reduce interference to adjacent carriers. In the third time slot, UE1 and UE2 perform uplink transmission and downlink reception in half-duplex mode, respectively.

[0061] In some scenarios, subband full-duplex assumes that the uplink and downlink use different subbands of a carrier within the same time period; full-duplex cell-free networks assume that different TRPs operate on the same subband / frequency resources.

[0062] In related technologies, during non-codebook PUSCH transmission, the precoded SRS transmitted by the UE only supports association with a single CSI-RS, not with multiple CSI-RS. Considering that multiple subarrays of a large antenna array on the network side perform coherent joint reception (CJR), or multiple TRPs in a cell-free network perform CJR reception, the UE calculating the SRS precoder based solely on a single CSI-RS may result in an inaccurate calculated SRS precoder. In some cases, such as when the number of ports used for uplink reception on the network side is small, it is necessary to consider the configuration of associating SRS with multiple CSI-RS, and to support the association relationships of multiple sets of SRS and CSI-RS, as well as multiple sets of SRS transmission configurations. For example, the TRP clusters for UL joint reception in different slots may be different, requiring the UE to calculate different SRS precoders in advance based on the association relationships of various SRS and CSI-RS sets, and to feed back multiple sets of precoded SRS for subsequent scheduling by the network side.

[0063] The transmission method of the detection reference signal (SRS) provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0064] Figure 4 is a schematic diagram of a method for transmitting a detection reference signal (SRS) according to an embodiment of this application. As shown in Figure 4, the method 400 includes at least the following:

[0065] S410, the terminal obtains the association relationship between the SRS and the downlink reference signal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal;

[0066] S420, the terminal determines the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted;

[0067] S430, the terminal uses the precoded information to send the target SRS.

[0068] The downlink reference signal in the embodiments of this application may include, for example, CSI-RS, Synchronization Signal Block (SSB), Phase Tracking Reference Signal (PTRS), or Demodulation Reference Signal (DMRS), or may include other downlink reference signals. This application does not limit this. The following description uses CSI-RS as the downlink reference signal, but this application is not limited to this.

[0069] In this embodiment, the downlink reference signal and the TRP are associated. When an information or signal is associated with a downlink reference signal, it can also be understood that the information or signal is associated with the TRP associated with the downlink reference signal. Similarly, when an information or signal is associated with a TRP, it can also be understood that the information or signal is associated with the downlink reference signal associated with the TRP. For example, if the SRS is associated with a downlink reference signal, it can also be understood that the SRS is associated with the TRP associated with the downlink reference signal; or, if the SRS is associated with a TRP, it can be understood that the SRS is associated with the reference signal associated with the TRP.

[0070] In some embodiments, the association between the SRS and the downlink reference signal can be configured periodically, semi-statically, or statically. For example, the network-side device can configure the effective time or period corresponding to the association between the SRS and the downlink reference signal, during which the association between the SRS and the downlink reference signal remains unchanged. Optionally, the effective time or period can also be predefined.

[0071] It should be understood that this application does not limit the unit of the effective time or period. For example, the length of the effective time or period can be the length of at least one time unit. Optionally, the time unit can be a radio frame, subframe, time slot, orthogonal frequency-division multiplexing (OFDM) symbol, etc. This application does not limit it.

[0072] In other embodiments, the association between the SRS and the downlink reference signal can also be dynamically configured. For example, the association between the SRS and the downlink reference signal can be dynamically configured by the network-side device through downlink signaling. Optionally, the downlink signaling can be a Radio Resource Control (RRC) message, a Media Access Control (MAC) control element, or Downlink Control Information (DCI), etc.

[0073] In the embodiments of this application, the association between the downlink reference signal and the TRP can mean that the TRP is mapped to the downlink reference signal, or that the TRP supports the transmission of the downlink reference signal.

[0074] In the embodiments of this application, the correlation between SRS and downlink reference signal can mean that the precoding information of SRS can be determined based on the downlink reference signal, for example, the precoding information of SRS can be calculated using the measurement results of the downlink reference signal.

[0075] It should be understood that, in the embodiments of this application, the association between the SRS and the downlink reference signal can be explicitly configured (or directly configured) or implicitly configured (or indirectly configured). For example, the network-side device can directly indicate the association between the SRS and the downlink reference signal, or it can indicate another association, and the terminal can determine the association between the SRS and the downlink reference signal based on the other association.

[0076] It should be understood that in some implementations, the terminal obtaining the association between the SRS and the downlink reference signal may include the terminal obtaining the association between multiple SRS and the downlink reference signal. A first part of the multiple SRS may be associated with a first set of downlink reference signals, and a second part of the multiple SRS may be associated with a second set of downlink reference signals. The first set of downlink reference signals includes one downlink reference signal, and the second set of downlink reference signals includes multiple downlink reference signals.

[0077] For example, if the terminal obtains the association relationship between multiple SRS and downlink reference signals, some SRS are associated with only one CSI-RS, while others are associated with multiple CSI-RS.

[0078] In some implementations, the set of downlink reference signals includes at least one downlink reference signal, including:

[0079] The set of downlink reference signals includes multiple downlink reference signals; or,

[0080] When the terminal obtains the association relationship between multiple SRS and downlink reference signals, a first part of the multiple SRS is associated with a first downlink reference signal set, and a second part of the multiple SRS is associated with a second downlink reference signal set. The first downlink reference signal set includes one downlink reference signal, and the second downlink reference signal set includes multiple downlink reference signals.

[0081] In some implementations, the terminal's acquisition of the correlation between the SRS and the downlink reference signal may include:

[0082] The terminal acquires a first mapping relationship, which represents the port mapping relationship between SRS and downlink reference signal;

[0083] Based on the first mapping relationship, the association between the SRS and the downlink reference signal is determined.

[0084] In some embodiments, obtaining the first mapping relationship by the terminal may include:

[0085] The terminal receives the first mapping relationship from the network-side device. For example, the network-side device indicates the first mapping relationship via downlink signaling. Optionally, the downlink signaling may include, but is not limited to, at least one of the following: RRC message, MAC CE, DCI.

[0086] In one specific embodiment, the first mapping relationship may be included in the Transmission Configuration Indicator (TCI) status indication. For example, the first mapping relationship may be part of the TCI status.

[0087] In other embodiments, the first mapping relationship may also be predefined.

[0088] In some embodiments, the terminal determines the association between the SRS and the downlink reference signal based on the first mapping relationship, including:

[0089] The downlink reference signal corresponding to the port mapped by the SRS is determined as the downlink reference signal associated with that SRS.

[0090] In other implementations, the terminal may obtain the correlation between the SRS and the downlink reference signal in the following ways:

[0091] The terminal receives first configuration information from the network-side device. The first configuration information is used to indicate the configuration of K SRS resource sets (SRS-ResourceSets), wherein each SRS resource set configuration is associated with a downlink reference signal set, and K is a positive integer.

[0092] That is, network-side devices can configure the association between SRS and downlink reference signals through SRS resource group configuration.

[0093] For example, an SRS resource group configuration may include associated downlink reference signal indications, such as associated CSI-RS indications, to indicate the set of downlink reference signals associated with the SRS in that SRS resource group configuration. This set of downlink reference signals may include one or more downlink reference signals. For instance, the associated downlink reference signal indication in the k-th SRS resource group configuration of the K SRS resource group configurations includes N... k A downlink reference signal, such as N k One CSI-RS.

[0094] The configuration method of the first configuration information will be described below with reference to specific embodiments.

[0095] In some embodiments, the first configuration information may be configured periodically or semi-statically.

[0096] In some embodiments, the method 400 further includes:

[0097] The terminal receives first indication information from the network device, which indicates the validity period or cycle of the first configuration information. That is, the validity period or cycle of the K SRS resource group configuration. Within the validity period or cycle of the first configuration information, the first configuration information remains unchanged. For example, for periodic uplink channel measurements, the network device can instruct the terminal to use the same first configuration information within the validity period or cycle, and then update the first configuration information after the validity period or cycle.

[0098] Optionally, the first indication information can be sent via an RRC message.

[0099] Optionally, the first indication information is included in the first configuration information. That is, when the network-side device indicates the configuration of the K SRS resource groups, it also configures the validity period or cycle of the K SRS resource group configuration.

[0100] In some embodiments, if the validity period or period of the first configuration information expires (in which case the first configuration information can be considered invalid), the terminal sends a first message to the network-side device to request an update to the first configuration information. In response to the first message, the network-side device sends a second message to the terminal, the second message including the updated first configuration information.

[0101] Optionally, the first message may include the terminal's uplink and downlink transmission requirements, that is, the terminal may use the uplink and downlink transmission requirement request message to request the network-side device to update the first configuration information.

[0102] Optionally, the validity period or cycle of the updated first configuration information can be carried in the second message. That is, when configuring the first configuration information for the terminal, the network-side device also configures the validity period or cycle of the first configuration information.

[0103] In other embodiments, the first configuration information may be dynamically configured.

[0104] In some embodiments, the method 400 further includes:

[0105] The terminal receives a first downlink signaling from the network device side device, the first downlink signaling being used to indicate updated first configuration information;

[0106] The terminal updates the first configuration information according to the first downlink signaling.

[0107] Optionally, the first downlink signaling can be a DCI, MAC CE, or RRC message, etc.

[0108] In some embodiments, each SRS resource group is configured for sending SRS in that SRS resource group configuration.

[0109] For example, an SRS resource group configuration is used to configure the SRS resources used for SRS transmission. SRSs in the same SRS resource group configuration constitute an SRS group. An SRS group includes one or more SRSs. SRSs in an SRS group are transmitted using the SRS resources configured in the same SRS resource group configuration.

[0110] It should be understood that, in the embodiments of this application, the SRS in the SRS resource group configuration associated with a downlink reference signal set can be understood as all SRS in the SRS resource group configuration being associated with the downlink reference signal set, or it can also be understood as the SRS resource group configuration and the downlink reference signal set having an association relationship, that is, the K SRS resource group configurations are associated with K downlink reference signal sets, wherein each SRS resource group configuration is associated with a downlink reference signal set.

[0111] In some embodiments, each of the K SRS resource group configurations corresponds to an index (or SRS group index, SRS resource group configuration index), which can be used to indicate the SRS resource group configuration, or the set of downlink reference signals associated with the SRS resource group configuration.

[0112] In some embodiments of this application, the method 400 further includes:

[0113] The terminal receives second configuration information from the network-side device. The second configuration information is used to configure the number of target groups M for the terminal to send SRS (denoted as mode one), or the target SRS group index set (denoted as mode two). The target SRS group index set includes M SRS group indexes, and each SRS group index is used to indicate an SRS resource group configuration and / or a downlink reference signal set.

[0114] In some embodiments, when the second configuration information indicates a target SRS group index set, it can be considered that the network-side device has triggered the SRS resource group configuration associated with the target SRS group index set, or triggered the transmission of SRS in the SRS resource group configuration.

[0115] Optionally, the second configuration information may also indicate the SRS resource index in the triggered SRS resource group configuration.

[0116] That is, the network-side device can trigger the entire SRS resource group configuration (in this case, it can be assumed that all SRS resources in the SRS resource group configuration are triggered), or it can trigger only some SRS resources in the SRS resource group configuration.

[0117] The configuration method of the second configuration information will be described below with reference to specific embodiments.

[0118] In some embodiments of this application, the second configuration information may be configured periodically or semi-statically.

[0119] In some embodiments, the method 400 further includes:

[0120] The terminal receives second indication information from the network device side device. This second indication information indicates the validity period or cycle of the second configuration information, specifically the validity period or cycle of the target group number M or the target SRS group index set. Within the validity period or cycle of this second configuration information, the second configuration information remains unchanged.

[0121] Optionally, the second indication information can be sent via an RRC message.

[0122] Optionally, the second indication information is included in the second configuration information. That is, when the network-side device indicates the second configuration information, it also configures the validity period or cycle of the second configuration information.

[0123] In some embodiments, if the validity period or period of the second configuration information expires (in which case the second configuration information can be considered invalid), the terminal sends a third message to the network-side device to request an update to the second configuration information. In response to the second message, the network-side device sends a fourth message to the terminal, the fourth message including the updated second configuration information.

[0124] Optionally, the fourth message may include the terminal's uplink and downlink transmission requirements, that is, the terminal may use the uplink and downlink transmission requirement request message to request the network-side device to update the second configuration information.

[0125] Optionally, the validity period or cycle of the updated second configuration information can be carried in the fourth message. That is, when configuring the second configuration information for the terminal, the network-side device also configures the validity period or cycle of the second configuration information.

[0126] In some embodiments of this application, the second configuration information may be dynamically configured.

[0127] In some embodiments, the method 400 further includes:

[0128] The terminal receives a second downlink signaling from the network device side device, the second downlink signaling being used to indicate updated second configuration information;

[0129] The terminal updates the second configuration information according to the second downlink signaling.

[0130] Optionally, the second downlink signaling can be a DCI, MAC CE, or RRC message, etc.

[0131] In some embodiments, when the second configuration information is used to configure the number of target groups of SRS sent by the terminal to be M, the target SRS may include M groups of SRS. The M groups of SRS are sent using SRS resources in the configuration of M SRS resource groups. The precoding information of the target SRS is determined based on the M downlink reference signal sets, wherein the M downlink reference signal sets are the downlink reference signal sets associated with the configuration of the M SRS resource groups.

[0132] For example, the terminal can select M SRS resource group configurations from K SRS resource group configurations (e.g., the first M, or the last M, etc.) as the SRS resource group configurations associated with the target SRS according to predefined rules, and then determine the precoding information of the target SRS according to the downlink reference signal set associated with the M SRS resource group configurations, and / or transmit the target SRS according to the SRS resources in the M SRS resource group configurations.

[0133] For example, the terminal can select M downlink reference signal sets from K downlink reference signal sets as the downlink reference signal sets associated with the target SRS according to predefined rules, determine the precoding information of the target SRS based on the M downlink reference signal sets, and then transmit the target SRS based on the precoding information. Alternatively, it can use the SRS resources in the configuration of the M SRS resource groups associated with the M downlink reference signal sets to transmit the target SRS.

[0134] For example, the terminal can configure the reception performance of K downlink reference signal sets associated with K SRS resource groups, select M downlink reference signal sets from the K downlink reference signal sets, and perform joint measurements on each of the K downlink reference signal sets to determine the joint measurement result of each downlink reference signal set. Based on the joint measurement result of the K downlink reference signal sets, the terminal determines the M downlink reference signal sets. For example, these M downlink reference signal sets are the M downlink reference signal sets with the best joint measurement results.

[0135] Optionally, the joint measurement result may include, but is not limited to, one of the following indications:

[0136] Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), and Received Signal Strength Indication (RSSI).

[0137] In other embodiments, when the second configuration information is used to configure the target SRS group index set, the target SRS group index set may include M SRS group indices to indicate M SRS resource group configurations or M downlink reference signal sets. Then, the target SRS may include M SRS in the M SRS resource group configurations, or include M SRS associated with the M downlink reference signal sets. The target SRS may be transmitted based on the SRS resources in the M SRS resource group configurations, and the precoding information of the target SRS can be determined based on the M downlink reference signal sets.

[0138] In the second method described above, if the network-side device explicitly indicates the target SRS group index set, the terminal can determine the M SRS resource group configurations indicated by the target SRS group index set as the SRS resource group configurations associated with the target SRS. Furthermore, it can transmit the target SRS based on the SRS resources in these M SRS resource group configurations. For example, it can transmit a group of SRSs in each of the M SRS resource group configurations according to the SRS resources in that configuration. And / or, the terminal can determine the M downlink reference signal sets indicated by the target SRS group index set as the downlink reference signal set associated with the target SRS. Furthermore, it can determine the precoding information of the target SRS based on these M downlink reference signal sets and then use this precoding information to transmit the target SRS.

[0139] In Method 1, the network-side device does not indicate the SRS resource group configuration or downlink reference signal set associated with the target SRS. In this case, the terminal needs to determine the SRS resource group configuration associated with the target SRS to determine the SRS resources used to transmit the target SRS, and / or determine the downlink reference signal set associated with the target SRS to determine the precoding information of the target SRS.

[0140] The following describes, with reference to specific embodiments, the method for determining the SRS resource group configuration or downlink reference signal set associated with the target SRS.

[0141] In some embodiments, the terminal may determine the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information.

[0142] For example, if the second configuration information is not sent, or if the second configuration information is sent but only the target group number M is indicated, the terminal can determine the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information.

[0143] In some embodiments, the first information includes at least one of the following:

[0144] Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission;

[0145] The correlation between the subarray and the downlink reference signal;

[0146] At least one uplink and downlink timeslot configuration (or uplink and downlink timeslot format) of a Transmitter / Receiver Point (TRP);

[0147] Uplink and downlink time slot configuration (or uplink and downlink time slot format) associated with downlink reference signals;

[0148] Downlink reference signal limitation information;

[0149] TRP limitation information;

[0150] At least one downlink reference signal's wireless channel attribute.

[0151] In some embodiments, the first information may be indicated by the network-side device or measured by the terminal, such as the wireless channel attributes of the downlink reference signal, which may be measured by the terminal.

[0152] In some embodiments, the limiting information for the downlink reference signal includes at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals. The set of downlink reference signals associated with the target SRS must include mandatory downlink reference signals and exclude unavailable downlink reference signals. Optionally, optional downlink reference signals may also be included.

[0153] In some embodiments, the TRP constraint information includes at least one of mandatory TRPs, optional TRPs, and unavailable TRPs. The set of downlink reference signals associated with the target SRS must include downlink reference signals associated with mandatory TRPs, but exclude downlink reference signals associated with unavailable TRPs. Optionally, it may also include downlink reference signals associated with optional TRPs.

[0154] In some embodiments, the wireless channel attribute includes at least one of the following:

[0155] Doppler spread, Doppler shift, average delay, delay spread, average gain, space receiver parameters.

[0156] In some embodiments, the average gain of at least one downlink reference signal represents the average value of the channel gain of the at least one downlink reference signal.

[0157] In some embodiments, the packet information for the downlink reference signal may be indicated by a network-side device. A packet may include one or more downlink reference signals.

[0158] In some embodiments, the association between the subarray and the downlink reference signal can be indicated by the network-side device. A subarray can be associated with one or more downlink reference signals, and when a subarray is associated with multiple downlink reference signals, these multiple downlink reference signals can correspond to different beam directions.

[0159] In some embodiments, since the downlink reference signal and the TRP are associated, a packet of the downlink reference signal can be considered as a packet of the TRP, and the TRP in a packet supports joint transmission.

[0160] The following section, in conjunction with the specific information in the first section, explains how to determine the SRS resource group configuration or downlink reference signal set associated with the target SRS.

[0161] Example 1: The first information includes the packet information of the downlink reference signal / TRP.

[0162] In this case, the terminal can select one or more downlink reference signals from each of at least one packet to form a set of downlink reference signals associated with the target SRS, based on the packet information of the downlink reference signal / TRP.

[0163] In some specific embodiments, determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes:

[0164] Based on the grouping information of the downlink reference signal, the downlink reference signal in at least one group is measured, and the target downlink reference signal in each group is determined based on the measurement results of the downlink reference signal in each group;

[0165] The target SRS associated downlink reference signal set includes the target downlink signal in each group, or the target SRS associated SRS ...

[0166] In some embodiments, the grouping of the downlink reference signal / TRP can be determined based on the uplink / downlink time slot configuration associated with the downlink reference signal / TRP.

[0167] Taking the scenario in Figure 5 as an example, the terminal is connected to TRP1, TRP2, and TRP3. The downlink reference signal set that the network-side device supports transmitting is {CSI-RS#1, CSI-RS#2, CSI-RS#3}. The TRP set associated with this downlink reference signal set is {TRP1, TRP2, TRP3}. Among them, CSI-RS#1 is associated with TRP1, CSI-RS#2 is associated with TRP2, and CSI-RS#3 is associated with TRP3. The uplink and downlink timeslot format of TRP1 is uplink and downlink timeslot format #1, i.e., DDDSU, or in other words... CSI-RS#1 is associated with uplink / downlink time slot format #1 (for TRP1), i.e., DDDSU; the uplink / downlink time slot format for TRP2 is uplink / downlink time slot format #2, i.e., DSUUU, or in other words, CSI-RS#2 is associated with uplink / downlink time slot format #2 (for TRP2), i.e., DSUUU; the uplink / downlink time slot format for TRP3 is uplink / downlink time slot format #3, i.e., DDSUU, or in other words, CSI-RS#3 is associated with uplink / downlink time slot format #3 (for TRP3), i.e., DDSUU, and the terminal's uplink / downlink time slot configuration is uplink / downlink time slot format #4, i.e., DDDUU.

[0168] Based on the above uplink and downlink time slot configuration, it can be determined that during the first uplink time period (slot 4), the TRP packets that support joint transmission include {TRP2, TRP3}, which are associated with the first CSI-RS packets {CSI-RS#1, CSI-RS#3}; during the second uplink time period (slot 5), the TRP packets that support joint transmission include {TRP1, TRP2, TRP3}, which are associated with the second CSI-RS packets {CSI-RS#1, CSI-RS#2, CSI-RS#3}.

[0169] When determining the set of downlink reference signals associated with a target SRS, the terminal can measure each CSI-RS in the first CSI-RS group and select the target CSI-RS in that first CSI-RS group, for example, the two CSI-RS with the highest signal quality. Similarly, it can measure each CSI-RS in the second CSI-RS group and select the target CSI-RS in that second CSI-RS group, for example, the one CSI-RS with the highest signal quality. The target CSI-RS selected in each CSI-RS group form a first CSI-RS set, which is then used as the set of CSI-RS associated with the target SRS set. If the first CSI-RS set is associated with the first SRS resource group configuration in K SRS resource group configurations, then the first SRS resource group configuration is determined as the SRS resource group configuration associated with the target SRS.

[0170] Example 2: The first information includes the correlation between the subarray and the downlink reference signal.

[0171] In this case, the terminal can select a target subarray from at least one subarray based on the association between the subarray and the downlink reference signal, and determine the set of downlink reference signals associated with the target SRS based on the downlink reference signal associated with the target subarray.

[0172] In some specific embodiments, determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes:

[0173] Measure at least one subarray, and determine the target subarray in the at least one subarray based on the measurement results of the at least one subarray;

[0174] The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target subarray, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

[0175] In some embodiments, the large antenna array of the network-side device includes multiple subarrays, each subarray corresponding to one or more downlink reference signals. The terminal can measure the multiple subarrays and determine a target subarray based on the measurement results of the multiple subarrays. The target subarray may include one or more subarrays. For example, the target subarray can be determined based on the measurement results of the multiple subarrays and a first threshold. Specifically, for example, subarrays whose measurement results are greater than or equal to the first threshold are determined as target subarrays. Optionally, the first threshold may be an RSRP threshold, an RSRQ threshold, a SINR threshold, or an RSSI threshold. Further, a set of downlink reference signals associated with the target SRS can be determined based on the downlink reference signals associated with the target subarray. For example, the set of downlink reference signals associated with the target SRS can be determined to include the downlink reference signals associated with the target subarray. Alternatively, an SRS resource group configuration associated with the target SRS can be determined based on the set of downlink reference signals associated with the target SRS. For example, the SRS resource group configuration associated with the set of downlink reference signals associated with the target SRS can be determined as the SRS resource group configuration associated with the target SRS.

[0176] Referring to Figure 6, as shown in Figure 6, the large antenna array of the network-side equipment includes four subarrays {#1,#2,#3,#4}, corresponding to {CSI-RS#1, CSI-RS#2, CSI-RS#3, CSI-RS#4}. Due to obstruction, the channel quality from subarray #1 to the terminal is poor (for example, the measurement result corresponding to CSI-RS#1 is poor). The terminal can select the subarray {#2,#3,#4} with better channel quality. Furthermore, it can be determined that the set of CSI-RS associated with the target SRS to be transmitted includes: {CSI-RS#2, CSI-RS#3, CSI-RS#4}.

[0177] For example, the association between the subarray / CSI-RS group and the CSI-RS can be shown in Table 1:

[0178] Table 1

[0179] In some embodiments, the terminal may select one or more CSI-RS (e.g., select one or more with the best signal quality) from each CSI-RS group or subarray associated with CSI-RS. The target CSI-RS selected from all CSI-RS groups or subarray associated with CSI-RS form a first CSI-RS set, and this first CSI-RS set is used as the CSI-RS set associated with the target SRS set. For example, if CSI-RS #1 is selected from the CSI-RS associated with subarray #1 or CSI-RS group #1, then the target SRS set may be selected from the CSI-RS associated with subarray #2 or CSI-RS group #2. If CSI-RS#3 is selected, and CSI-RS#5 is selected from the CSI-RS associated with subarray #3 or CSI-RS group #3, and CSI-RS#8 is selected from the CSI-RS associated with subarray #4 or CSI-RS group #4, then the first CSI-RS set can be determined to include {CSI-RS#1, CSI-RS#3, CSI-RS#5, CSI-RS#8}. Alternatively, the SRS resource group configuration associated with the first CSI-RS set can be determined based on the first configuration information, and this SRS resource group configuration associated with the first CSI-RS set can be determined as the SRS resource group configuration associated with the target SRS. Further, the precoding information of the target SRS can be determined based on the first CSI-RS set, and / or the SRS resources in the SRS resource group configuration associated with the target SRS can be used to transmit the target SRS.

[0180] In the above embodiments, the target subarray can be selected by the terminal. This method is simple for the terminal to implement and helps to reduce the signaling overhead of network-side devices.

[0181] In other embodiments, the network-side device may also indicate the target subarray to the terminal, or the terminal may not select a subarray, i.e., all subarrays are determined as target subarrays, and the network-side device selects the subarray. For example, the terminal transmits the SRS associated with the downlink reference signals associated with all subarrays. When the network-side device schedules the terminal, it indicates the selected SRS resource group configuration or downlink reference signal set to the terminal. Using this method, the terminal can transmit SRS configurations with different transmit powers using different SRS resource group configurations, and having the network-side device select the target subarray can reduce interference between different users during MU scheduling.

[0182] Example 3: The first information includes uplink and downlink time slot configurations associated with at least one TRP / downlink reference signal.

[0183] It should be noted that the uplink / downlink time slot configuration (or uplink / downlink time slot format) in this application embodiment can be used to configure the transmission direction of the terminal or TRP in multiple time units, or in other words, to configure the time length of the terminal or TRP in at least one transmission direction.

[0184] For example, the transmission direction may include at least one of the following:

[0185] Uplink (UL, U) transmission, downlink (DL, D) transmission, flexible (F) transmission, or special (S) transmission, full-duplex transmission.

[0186] Among them, special transmission refers to special transmission that includes a guard interval. The time unit corresponding to this special transmission can refer to a special time unit that includes the guard interval. For network-side equipment, special transmission can be considered as flexible transmission.

[0187] In some embodiments, when a time period is configured for uplink transmission, it can be considered an uplink transmission time period; when a time period is configured for downlink transmission, it can be considered a downlink transmission time period; when a time period is configured for flexible transmission, it can be considered a flexible transmission time period; and when a time period is configured for full-duplex transmission, it can be considered a full-duplex transmission time period. Within a full-duplex transmission time period, frequency domain resources (e.g., downlink subband) for downlink transmission and frequency domain resources (e.g., uplink subband) for uplink transmission are configured simultaneously, allowing the terminal to perform uplink and downlink transmissions on the corresponding frequency domain resources respectively.

[0188] In some embodiments, the time unit can be represented in units of time length such as radio frames, subframes, time slots, OFDM symbols, etc.

[0189] The uplink and downlink time slot configuration in this application embodiment can also be referred to as TDD time slot format. For example, in an NR system, the uplink and downlink time slot configuration is configured through the parameter TDD-UL-DL-configcommon.

[0190] In some specific embodiments, determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes:

[0191] Based on the uplink and downlink time slot configuration of the at least one TRP, a target TRP that supports uplink transmission within a target time period of the terminal is determined, wherein the target time period of the terminal is the time period during which the terminal supports uplink transmission.

[0192] The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target TRP, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

[0193] In some embodiments, the target time period of the terminal can be the terminal's uplink transmission time period, or a flexible transmission time period, or it can be the terminal's full-duplex transmission time period. For example, when the terminal has full-duplex capability (e.g., SBFD capability), the network-side device can configure a full-duplex transmission time period for the terminal. Optionally, the target time period can be represented by time units such as radio frames, subframes, time slots, or Orthogonal frequency-division multiplexing (OFDM) symbols, and this application does not limit this.

[0194] In some scenarios, a terminal supports connections with at least two TRPs, which may correspond to different uplink and downlink time slot configurations. In this case, the terminal can determine the target TRP that supports uplink transmission within the terminal's target time period based on the uplink and downlink time slot configurations of the at least two TRPs. Then, based on the target TRP, the terminal determines the reference signal set or SRS resource group configuration associated with the target SRS. For example, it can determine that the downlink reference signal set associated with the target TRP includes the downlink reference signals associated with the target TRP, or it can determine the SRS resource group configuration associated with the target SRS based on the downlink reference signal set associated with the target TRP. For example, it can determine the SRS resource group configuration associated with the downlink reference signal set as the SRS resource group configuration associated with the target SRS.

[0195] In some embodiments, the network-side device may indicate a second mapping relationship to the terminal, which includes a mapping relationship between at least one TRP / downlink reference signal and uplink / downlink time slot configuration (or uplink / downlink time slot format). Through this second mapping relationship, the terminal can learn about the uplink / downlink time slot configuration associated with at least one TRP / downlink reference signal.

[0196] In some embodiments, the terminal determines at least one set of downlink reference signals associated with SRS based on the uplink / downlink time slot configuration associated with the at least one TRP / downlink reference signal. Each set of SRS corresponds to a target time period for the terminal. For example, the terminal can determine a TRP configured for uplink transmission or flexible transmission within the target time period as the target TRP, or determine the downlink reference signal associated with the target TRP as the set of downlink reference signals associated with a set of SRS transmitted within the target time period. The terminal can then calculate the precoding information for the set of SRS transmitted within the target time period based on the downlink reference signal set. Alternatively, the terminal can determine the SRS resource group configuration associated with a set of SRS transmitted within the target time period based on the downlink reference signal set. For example, the terminal can determine the SRS resource group configuration associated with the downlink reference signal set as the SRS resource group configuration associated with a set of SRS transmitted within the target time period, and then transmit the set of SRS based on the SRS resources in the SRS resource group configuration.

[0197] In some cases, if the terminal is configured for flexible transmission during the first time period, whether the first time period supports uplink transmission can be determined based on the uplink and downlink time slot configuration of the TRP to which the terminal is connected.

[0198] For example, if all TRPs connected to the terminal are configured for either downlink transmission or flexible transmission, then the first time period can be considered as the uplink transmission time period of the terminal, that is, the first time period is the target time period of the terminal. The terminal can then determine the target TRP that supports uplink transmission within the target time period, and then determine the downlink reference signal set or SRS resource group configuration associated with the target SRS based on the target TRP.

[0199] For example, if a TRP connected to the terminal is configured for downlink transmission, then the first time period can be determined as the downlink transmission time period of the terminal, that is, the first time period is not the target time period of the terminal.

[0200] In some embodiments, when the terminal has full-duplex capability (e.g., SBFD capability), the terminal can determine the downlink reference signal set or SRS resource group configuration associated with the target SRS transmitted within the frequency domain resources (e.g., subbands) for uplink transmission based on the uplink and downlink time slot configuration of at least one TRP and the uplink and downlink time slot configuration of the terminal. The frequency domain resources for uplink transmission can be located within the uplink transmission time period of the terminal, or within the flexible transmission time period, or within the full-duplex transmission time period. Furthermore, the precoding information of the target SRS can be determined based on the downlink reference signal set, and the target SRS can be transmitted on the time resources and frequency domain resources configured by the network-side device.

[0201] For example, suppose a terminal connects to two TRPs and supports SBFD capability, where the downlink transmission time of the Band Width Part (BWP) 1 of TRP1 overlaps with the uplink transmission time of BWP2 of TRP2. During the overlapping time period, the terminal receives downlink signals from TRP1 on BWP1, sends uplink signals to TRP2 on BWP2, and transmits the target SRS based on the CSI-RS transmitted by TRP2 on BWP2.

[0202] Referring to the scenario shown in Figure 5, during the first uplink time period (slot 4), the target TRPs supporting uplink transmission include {TRP2, TRP3}, and the associated CSI-RS set includes {CSI-RS#2, CSI-RS#3}. The terminal can then determine that a group of SRSs sent during the first uplink time period (denoted as SRS group #1) is associated with the CSI-RS set {CSI-RS#2, CSI-RS#3}. The terminal can then use this CSI-RS set {CSI-RS#2, CSI-RS#3} as a reference. The precoding information of SRS group #1 can be determined by I-RS#3}. Alternatively, the terminal can determine the SRS resource group configuration associated with SRS group #1 based on the CSI-RS set {CSI-RS#2, CSI-RS#3}. For example, the SRS resource group configuration associated with the CSI-RS set {CSI-RS#2, CSI-RS#3} (e.g., SRS resource group configuration #1) can be determined as the SRS resource group configuration associated with SRS group #1, and the SRS resources in SRS resource group configuration #1 can be used to send SRS group #1.

[0203] During the second uplink time period (slot 5), the target TRPs supporting uplink transmission include {TRP1, TRP2, TRP3}, and the associated CSI-RS set includes {CSI-RS#1, CSI-RS#2, CSI-RS#3}. The terminal can then determine that a group of SRSs (denoted as SRS group #2) sent during the second uplink time period is associated with the CSI-RS set {CSI-RS#1, CSI-RS#2, CSI-RS#3}. The terminal can determine the precoding information of SRS group #2 based on the CSI-RS set {CSI-RS#1, CSI-RS#2, CSI-RS#3}. Alternatively, the terminal can determine the SRS resource group configuration associated with SRS group #2 based on the CSI-RS set {CSI-RS#1, CSI-RS#2, CSI-RS#3}. For example, the SRS resource group configuration associated with the CSI-RS set {CSI-RS#1, CSI-RS#2, CSI-RS#3} (e.g., SRS resource group configuration #2) can be determined as the SRS resource group configuration associated with SRS group #2, and SRS group #2 can be sent using the SRS resources in SRS resource group configuration #2.

[0204] Example 4: The first information includes the radio channel attributes of at least one downlink reference signal.

[0205] In some embodiments, the wireless channel properties of at least one downlink reference signal can be obtained by terminal measurement.

[0206] In some specific embodiments, determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes:

[0207] Based on the radio channel attributes of the at least one downlink reference signal, at least one set of downlink reference signals is determined, wherein the downlink reference signals in each set of downlink reference signals have the same or similar radio channel attributes;

[0208] The at least one downlink reference signal set is determined as the downlink reference signal set associated with the target SRS, or the SRS resource group configuration associated with the at least one downlink reference signal set is determined as the SRS resource group configuration associated with the target SRS.

[0209] In some embodiments of this application, the method 400 further includes:

[0210] The terminal receives third configuration information from the network-side device. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in the K SRS resource group configurations, or the transmission time information associated with each downlink reference signal set in the K downlink reference signal sets, or the transmission time information associated with the K SRS groups.

[0211] Optionally, if the transmission time information associated with each SRS resource group configuration does not overlap, then when the terminal selects a certain SRS resource group configuration, it can use the associated transmission time information to send SRS. In this way, the network-side device can determine the SRS resource configuration associated with the SRS based on the transmission time of the SRS.

[0212] Optionally, if the transmission time information associated with each downlink reference signal set does not overlap, then when the terminal selects a certain downlink reference signal set, it can use the associated transmission time information to transmit the SRS, and the network-side device can determine the downlink reference signal set associated with the SRS based on the transmission time of the SRS.

[0213] In some embodiments, the transmission time information associated with each SRS resource group configuration includes the initial transmission time of a set of SRSs corresponding to each SRS resource group configuration, or the minimum time difference information between a set of SRSs corresponding to each SRS resource group configuration and the associated downlink reference signal set.

[0214] In some embodiments, the minimum time difference information between the set of SRSs and the associated set of downlink reference signals is used to indicate the minimum time difference between the set of SRSs and the last downlink reference signal in the set of downlink reference signals associated with the set of SRSs, wherein the last downlink reference signal is the latest downlink reference signal in the set of downlink reference signals.

[0215] The configuration method of the third configuration information will be described below with reference to specific embodiments.

[0216] In some embodiments, the third configuration information may be configured periodically or semi-statically.

[0217] In some embodiments, the method 400 further includes:

[0218] The terminal receives third indication information from the network device, the third indication information indicating the validity period or cycle of the third configuration information. During the validity period or cycle of the third configuration information, the third configuration information remains unchanged.

[0219] For example, taking K=7 as an example, the time resources associated with the configuration of the 7 SRS resource groups or CSI-RS sets can be as shown in Figure 7. Within the effective time or period of the third configuration information, the time resources associated with each SRS resource group configuration or CSI-RS set remain unchanged, and the time resources can be considered to be semi-static or static time resources.

[0220] Optionally, the third indication information can be sent via RRC messages.

[0221] Optionally, the third indication information is included in the third configuration information. That is, when the network-side device indicates the first configuration information, it also configures the validity period or cycle of the first configuration information.

[0222] In some embodiments, if the validity period or period of the third configuration information expires (in which case the third configuration information can be considered invalid), the terminal sends a fifth message to the network-side device to request an update to the third configuration information. In response to the first message, the network-side device sends a sixth message to the terminal, the sixth message including the updated third configuration information.

[0223] Optionally, the fifth message may include the terminal's uplink and downlink transmission requirements, that is, the terminal may use the uplink and downlink transmission requirement request message to request the network-side device to update the third configuration information.

[0224] Optionally, the validity period or cycle of the updated third configuration information can be carried in the sixth message. That is, when configuring the first configuration information for the terminal, the network-side device also configures the validity period or cycle of the third configuration information.

[0225] In some embodiments, the third configuration information may be dynamically configured.

[0226] In some embodiments, the method 400 further includes:

[0227] The terminal receives a third downlink signaling from the network device side device, the third downlink signaling being used to indicate updated third configuration information;

[0228] The terminal updates the third configuration information according to the third downlink signaling.

[0229] Optionally, the third downlink signaling can be DCI, MAC CE, or RRC messages, etc.

[0230] In some embodiments, when the network-side device dynamically updates the SRS resource group configuration or the time resources associated with the downlink reference signal set, the network-side device may only update the SRS resource group configuration or the time resources associated with the downlink reference signal set associated with the target SRS.

[0231] For example, when the second configuration information indicates the target SRS group index set, the network-side device can only update the time resources associated with the SRS resource group configuration or downlink reference signal set indicated by the target SRS group index set, which helps to reduce the overhead of time resources.

[0232] For example, if the second configuration information configures the SRS group index set as {#1, #2}, then the network-side device configures the time resources corresponding to SRS group index #1 and SRS group index #2 respectively. That is, the time resources associated with the SRS resource group configuration or downlink reference signal set indicated by SRS group index #1 and SRS group index #2. For example, SRS group index #1 is configured to correspond to the first time resource, and SRS group index #2 is configured to correspond to the second time resource, wherein the first time resource and the second time resource are different.

[0233] In some embodiments of this application, when the reference signal resource set or SRS resource group configuration associated with the target SRS is selected by the terminal, the network-side device cannot know the reference signal resource set or SRS resource group configuration associated with the target SRS sent by the terminal. The terminal can indicate to the network-side device the reference signal resource set or SRS resource group configuration associated with the target SRS sent by the terminal.

[0234] For example, a terminal can explicitly indicate the selected reference signal resource set or SRS resource group configuration through a bitmap, SRS resource group configuration index, or reference signal set index. Alternatively, the selected reference signal resource set or SRS resource group configuration can be implicitly indicated through the SRS transmission time.

[0235] In other embodiments, if the terminal does not indicate the reference signal resource set or SRS resource group configuration associated with the target SRS to the network-side device, and the reference signal resource set or SRS resource group configuration used by the terminal is not configured by the network-side device, the network-side device can determine the reference signal resource set or SRS resource group configuration associated with the target SRS sent by the terminal by blindly detecting the SRS.

[0236] In some embodiments of this application, the method 400 further includes:

[0237] When the target SRS is triggered to transmit, the terminal triggers the reception of the downlink reference signal set associated with the target SRS.

[0238] Correspondingly, when the terminal triggers the transmission of the target SRS, the network-side device triggers the transmission of the downlink reference signal set associated with the target SRS.

[0239] For example, if the terminal determines to trigger the transmission of SRS#1 and SRS#2, where SRS#1 is associated with CSI-RS#1 and SRS#2 is associated with CSI-RS#2, then the network-side device can determine to trigger the transmission of CSI-RS#1 and CSI-RS#2, and the terminal can determine to trigger the reception of CSI-RS#1 and CSI-RS#2.

[0240] In some embodiments, the target SRS is an aperiodic SRS, and the set of downlink reference signals associated with the target SRS includes aperiodic downlink reference signals.

[0241] In some embodiments of this application, the method 400 further includes:

[0242] The transmit power of the target SRS is determined based on the path loss information of each downlink reference signal in the downlink reference signal set associated with the target SRS.

[0243] In some specific implementations, the terminal can determine the transmit power of the target SRS based on the minimum path loss, maximum path loss, average path loss, or joint path loss of the downlink reference signals in the downlink reference signal set. The joint path loss is determined based on the receive power (denoted as joint receive power) calculated by the terminal for joint reception of the downlink reference signals in the downlink reference signal set.

[0244] For example, the terminal can determine the equivalent channel information based on the measurement results of each downlink reference signal in the downlink reference signal set. Based on the equivalent channel information, the terminal can determine the received power for joint reception of the downlink reference signals in the downlink reference signal set. The joint path loss can be determined based on the joint received power.

[0245] For example, the transmit power of the target SRS can be determined according to the following formula:

[0246] Among them, P CMAX,f,c (i): represents the maximum transmit power configured for the terminal in carrier f, serving cell c, and SRS transmission slot i;

[0247] P O_SRS,b,f,c (q s ): This indicates that q is configured in carrier f, BWPb, serving cell c, and SRS resource group. s The configured p0 value;

[0248] M SRS,b,f,c (i): represents the number of SRS RBs configured on carrier f, BWP b, serving cell c, and transmission slot i;

[0249] αSRS,b,f,c (q s ): This indicates that q is configured in carrier f, BWP b, serving cell c, and SRS resource group. s The configured alpha value;

[0250] PL b,f,c (q d ): This indicates that for carrier f, BWP b, serving cell c, and SRS resource group configuration q s The terminal configures q through the SRS resource group. s Associated CSI-RS set index q d The path loss is calculated from the minimum path loss, maximum path loss, average path loss, or combined path loss.

[0251] h b,f,c (i,l)=δ SRS,b,f,c (i): represents the power adjustment value in power adjustment state l at carrier f, BWP b, serving cell c, transmission slot i in SRS.

[0252] In some embodiments, PL b,f,c (q d ) = PL max (q d ), where PL max (q d ) indicates the CSI-RS set #q d The path loss corresponding to the CSI-RS with the highest path loss is, i.e. N k For the CSI-RS set #q d The number of CSI-RS in the data.

[0253] In some embodiments, PL b,f,c (q d ) = PL min (q d ), where PL min (q d ) indicates the CSI-RS set #q d The path loss corresponding to the CSI-RS with the minimum path loss is, i.e., N k For the CSI-RS set #q d The number of CSI-RS in the data.

[0254] In some embodiments, PL b,f,c (q d ) = PL ave (q d ), where PL ave (q d) indicates the CSI-RS set #q d The average path loss of CSI-RS in the data, i.e. N k For the CSI-RS set #q d The number of CSI-RS in the data.

[0255] In some embodiments, PL b,f,c (q d ) = PL ave,precoded (q d ), where PL ave,precoded (q d () is based on the CSI-RS set #q calculated by the terminal. d The joint received power is determined. For example, when considering the CSI-RS set #q d When all CSI-RSs are jointly transmitted, the terminal can calculate the CSI-RS set #q d The received power of all CSI-RSs is used for joint reception, i.e., the joint received power, and then the joint path loss is determined based on the joint received power.

[0256] In some embodiments, the terminal determines the precoding information of the target SRS based on the downlink reference signal set associated with the target SRS to be transmitted, including:

[0257] The terminal determines the precoding information of the target SRS based on the number of ports of the downlink reference signals in the downlink reference signal set associated with the target SRS to be transmitted.

[0258] As an example, the terminal determines the precoding information of the target SRS based on the total number of ports of all downlink reference signals in the set of downlink reference signals associated with the target SRS to be transmitted. Calculating the precoding information of the target SRS in this way improves the accuracy of the calculated precoding information.

[0259] As another example, the terminal determines at least one first precoding information based on the number of ports of each downlink reference signal in the set of downlink reference signals associated with the target SRS to be transmitted, and determines the precoding information of the target SRS based on the at least one first precoding information. That is, the terminal determines the corresponding precoding information based on the number of ports of a single downlink reference signal, and then determines the precoding information of the target SRS based on the precoding information corresponding to all downlink reference signals in the set of downlink reference signals. Using this method to calculate the precoding information of the target SRS reduces the complexity of calculating the precoding information.

[0260] As another example, the terminal determines second precoding information based on the number of ports of a first downlink reference signal in the set of downlink reference signals associated with the target SRS to be transmitted, and determines precoding information of the target SRS based on the second precoding information, wherein the first downlink reference signal includes at least one downlink reference signal in the set of downlink reference signals associated with the target SRS. Using this method to calculate the precoding information of the target SRS reduces the complexity of calculating the precoding information.

[0261] Optionally, the first downlink reference signal includes one or more downlink reference signals with the best signal quality from the set of downlink reference signals, or one or more downlink reference signals with signal quality greater than a second threshold. Optionally, the second threshold may be an RSRP threshold, an RSRQ threshold, a SINR threshold, or an RSSI threshold. Optionally, the second threshold may be configured by the network-side device, or predefined.

[0262] In one specific embodiment, the terminal can determine the precoding information of the target SRS based on the second precoding information, combined with the number of ports of the first downlink reference signal and the total number of ports of all downlink reference signals in the downlink reference signal set. For example, based on the ratio between the number of ports of the first downlink reference signal and the total number of ports of all downlink reference signals in the downlink reference signal set, the second precoding information can be expanded to precoding information corresponding to the total number of ports, thereby obtaining the precoding information of the target SRS. For example, the precoding information corresponding to the ports of other downlink reference signals in the downlink reference signal set besides the first downlink reference signal can use or copy part or all of the second precoding information. In summary, in the embodiments of this application, an SRS can be associated with one or more downlink reference signals, and the terminal can calculate the precoding information based on the downlink reference signals associated with the SRS, and then transmit the SRS based on the precoding information. This transmission method enables the terminal to calculate a more accurate SRS precoder based on the downlink reference signals associated with the multiple TRPs during joint transmission when the terminal is connected to multiple TRPs. Then, SRS transmission is performed based on this SRS precoder, which helps ensure more accurate uplink channel measurements by network-side equipment, leading to more accurate uplink transmission configuration and guaranteed uplink performance. Scenarios where the terminal connects to multiple TRPs can include CJR reception scenarios involving multiple subarrays of a large antenna array on the network side, as well as CJR reception scenarios involving multiple TRPs in a cell-free network. Furthermore, the increased number of ports used for uplink reception on the network-side equipment helps improve the uplink transmission rate.

[0263] The method embodiments of this application have been described in detail above with reference to Figures 4 to 7. The device embodiments of this application have been described in detail below with reference to Figures 8 to 12. It should be understood that the device embodiments correspond to the method embodiments, and similar descriptions can be referred to the method embodiments.

[0264] The method for transmitting a detection reference signal (SRS) provided in this application can be executed by a communication device. This application uses an example of a communication device executing the SRS transmission method to illustrate the communication device provided in this application.

[0265] Figure 8 shows a schematic block diagram of a communication device 600 according to an embodiment of this application. As shown in Figure 8, the communication device 600 includes:

[0266] The processing unit 610 is configured to acquire the association relationship between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal; and to determine the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted.

[0267] The communication unit 620 uses the precoded information to transmit the target SRS.

[0268] In some embodiments, the processing unit 610 is further configured to:

[0269] Obtain the first mapping relationship, which represents the port mapping relationship between SRS and downlink reference signal;

[0270] Based on the first mapping relationship, the association between the SRS and the downlink reference signal is determined.

[0271] In some embodiments, the first mapping relationship is included in the Transport Configuration Indicator (TCI) status indication.

[0272] In some embodiments, the processing unit 610 is further configured to:

[0273] The terminal receives first configuration information from the network-side device. The first configuration information is used to indicate K SRS resource group configurations, where K is a positive integer. Each SRS in each SRS resource group configuration is associated with the same downlink reference signal set. Each SRS resource group configuration is used for the transmission of the SRS in the SRS resource group configuration.

[0274] In some embodiments, the communication unit 620 is further configured to:

[0275] The network device receives first indication information, which is used to indicate the validity period or cycle of the first configuration information.

[0276] In some embodiments, the communication unit 620 is further configured to:

[0277] The network device receives a first downlink signaling, which is used to indicate updated first configuration information;

[0278] The terminal updates the first configuration information according to the first downlink signaling.

[0279] In some embodiments, the communication unit 620 is further configured to:

[0280] The network-side device receives second configuration information, which is used to configure the communication device 600 to send a target number M of SRS, or a target SRS group index set, wherein the target SRS group index set includes M SRS group indices, each SRS group index is used to indicate an SRS resource group configuration or a downlink reference signal set associated with the SRS resource group configuration, wherein the target SRS includes M SRS groups, and M is a positive integer.

[0281] In some embodiments, the communication unit 620 is further configured to:

[0282] The network device receives a second indication information, which is used to indicate the validity period or cycle of the second configuration information.

[0283] In some embodiments, the communication unit 620 is further configured to:

[0284] The network device receives a second downlink signaling, which is used to indicate updated second configuration information;

[0285] The terminal updates the second configuration information according to the second downlink signaling.

[0286] In some embodiments, the processing unit 610 is further configured to:

[0287] Based on at least one of the second configuration information and the first information, determine the SRS resource group configuration or downlink reference signal set associated with the target SRS;

[0288] The first information includes at least one of the following:

[0289] Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission;

[0290] The correlation between the subarray and the downlink reference signal;

[0291] Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP);

[0292] Uplink and downlink time slot configuration associated with downlink reference signal;

[0293] Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals;

[0294] TRP restriction information, used to indicate at least one of the required TRPs, optional TRPs, and unavailable TRPs;

[0295] At least one wireless channel attribute of a downlink reference signal, wherein the wireless channel attribute includes at least one of Doppler spread, Doppler frequency shift, average delay, delay spread, average gain, and spatial receiver parameters.

[0296] In some embodiments, the processing unit 610 is further configured to:

[0297] If the second configuration information is used to configure the target SRS group index set, the M SRS resource group configurations indicated by the target SRS group index set are determined as the SRS resource group configurations associated with the target SRS; or, the M downlink reference signal sets indicated by the target SRS group index set are determined as the downlink reference signal set associated with the target SRS; or

[0298] If the second configuration information is used to configure the target number of SRS sent by the terminal, the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS is determined according to the first information.

[0299] In some embodiments, the processing unit 610 is further configured to:

[0300] If the first information includes downlink reference signal grouping information, the downlink reference signal in at least one group is measured according to the downlink reference signal grouping information, and the target downlink reference signal in each group is determined according to the measurement results of the downlink reference signal in each group.

[0301] The set of downlink reference signals associated with the target SRS includes the target downlink signals in each group, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

[0302] In some embodiments, the processing unit 610 is further configured to:

[0303] If the first information includes the correlation between the subarray and the downlink reference signal, at least one subarray is measured, and the target subarray in the at least one subarray is determined based on the measurement results of the at least one subarray.

[0304] The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target subarray, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

[0305] In some embodiments, the processing unit 610 is further configured to:

[0306] If the first information includes uplink and downlink time slot configurations of at least one TRP, the target TRP that supports uplink transmission within the target time period of the terminal is determined based on the uplink and downlink time slot configurations of the at least one TRP, wherein the target time period of the terminal is the time period during which the terminal supports uplink transmission.

[0307] The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target TRP, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

[0308] In some embodiments, the processing unit 610 is further configured to:

[0309] If the first information includes the radio channel attributes of at least one downlink reference signal, at least one set of downlink reference signals is determined based on the radio channel attributes of the at least one downlink reference signal, wherein the downlink reference signals in each set of downlink reference signals have the same radio channel attributes.

[0310] The at least one downlink reference signal set is determined as the downlink reference signal set associated with the target SRS, or the SRS resource group configuration associated with the at least one downlink reference signal set is determined as the SRS resource group configuration associated with the target SRS.

[0311] In some embodiments, the communication unit 620 is further configured to:

[0312] The terminal uses the SRS resources in the SRS resource group configuration associated with the target SRS and the precoded information to send the target SRS.

[0313] In some embodiments, the communication unit 620 is further configured to:

[0314] Receive third configuration information from the network-side device. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in K SRS resource group configurations, where K is a positive integer.

[0315] In some embodiments, the transmission time information associated with each SRS resource group configuration includes the initial transmission time of a set of SRSs corresponding to each SRS resource group configuration, or the minimum time difference information between a set of SRSs corresponding to each SRS resource group configuration and the associated downlink reference signal set.

[0316] In some embodiments, the minimum time difference information between the set of SRSs and the associated set of downlink reference signals is used to indicate the minimum time difference between the set of SRSs and the last downlink reference signal in the set of downlink reference signals associated with the set of SRSs, wherein the last downlink reference signal is the latest downlink reference signal in the set of downlink reference signals.

[0317] In some embodiments, the communication unit 620 is further configured to:

[0318] The third indication information is received from the network device side device, and the third indication information is used to indicate the validity period or cycle of the third configuration information.

[0319] In some embodiments, the communication unit 620 is further configured to:

[0320] Receive a third downlink signaling from the network device side device, the third downlink signaling being used to indicate updated third configuration information;

[0321] The terminal updates the third configuration information according to the third downlink signaling.

[0322] In some embodiments, the communication unit 620 is further configured to:

[0323] When the target SRS is triggered to transmit, the downlink reference signal set associated with the target SRS is triggered to be received, wherein the target SRS is an aperiodic SRS and the downlink reference signal set associated with the target SRS includes aperiodic downlink reference signals.

[0324] In some embodiments, the processing unit 610 is further configured to:

[0325] The transmit power of the target SRS is determined based on the path loss of each downlink reference signal in the set of downlink reference signals associated with the target SRS.

[0326] In some embodiments, the processing unit 610 is further configured to:

[0327] The transmit power of the target SRS is determined based on the minimum path loss, maximum path loss, average path loss, or joint path loss of the downlink reference signals in the downlink reference signal set, wherein the joint path loss is determined based on the receive power calculated by the communication device 600 for joint reception of the downlink reference signals in the downlink reference signal set.

[0328] In some embodiments, the processing unit 610 is further configured to:

[0329] The precoding information of the target SRS is determined based on the total number of ports of all downlink reference signals in the downlink reference signal set associated with the target SRS to be transmitted; or

[0330] Based on the number of ports of each downlink reference signal in the set of downlink reference signals associated with the target SRS to be transmitted, at least one first precoding information is determined, and based on the at least one first precoding information, the precoding information of the target SRS is determined; or

[0331] Based on the number of ports of the first downlink reference signal in the downlink reference signal set associated with the target SRS to be transmitted, second precoding information is determined, and based on the second precoding information, precoding information of the target SRS is determined, wherein the first downlink reference signal includes at least one downlink reference signal in the downlink reference signal set associated with the target SRS.

[0332] Optionally, in some embodiments, the communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The processing unit may be one or more processors.

[0333] It should be understood that the communication device 600 according to the embodiments of this application can correspond to the terminal in the method embodiments of this application, and the above and other operations and / or functions of each unit in the communication device 600 are respectively to implement the process executed by the terminal in the method embodiments shown in FIG4 to FIG7 and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0334] Figure 9 shows a schematic block diagram of a communication device 700 according to an embodiment of this application. As shown in Figure 9, the device 700 includes:

[0335] The transmitting unit 710 is used to indicate to the terminal the association relationship between the SRS and the downlink reference signal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal;

[0336] The receiving unit 720 is configured to receive the target SRS sent by the terminal, wherein the precoding information of the target SRS is determined based on the downlink reference signal set associated with the target SRS.

[0337] In some embodiments, the sending unit 710 is further configured to:

[0338] The network-side device indicates a first mapping relationship to the terminal. The first mapping relationship represents the port mapping relationship between the SRS and the downlink reference signal. The first mapping relationship is used to determine the association relationship between the SRS and the downlink reference signal.

[0339] In some embodiments, the first mapping relationship is included in the Transport Configuration Indicator (TCI) status indication.

[0340] In some embodiments, the sending unit 710 is further configured to:

[0341] Send first configuration information to the terminal. The first configuration information is used to configure K SRS resource group configurations, wherein each SRS in each SRS resource group configuration is associated with the same downlink reference signal set, and K is a positive integer.

[0342] In some embodiments, the sending unit 710 is further configured to:

[0343] Send a first indication message to the terminal, the first indication message being used to indicate the validity period or cycle of the first configuration information.

[0344] In some embodiments, the sending unit 710 is further configured to:

[0345] A first downlink signaling is sent to the terminal, the first downlink signaling being used to indicate updated first configuration information.

[0346] In some embodiments, the sending unit 710 is further configured to:

[0347] Send second configuration information to the terminal. The second configuration information is used to configure the number M of target groups for the terminal to send SRS, or a set of target SRS group indexes. The set of target SRS group indexes includes M SRS group indexes. Each SRS group index is used to indicate an SRS resource group configuration or a set of downlink reference signals associated with the SRS resource group configuration. The target SRS includes M SRS groups, where M is a positive integer.

[0348] In some embodiments, the sending unit 710 is further configured to:

[0349] Send a second indication message to the terminal, the second indication message being used to indicate the validity period or cycle of the second configuration information.

[0350] In some embodiments, the sending unit 710 is further configured to:

[0351] A second downlink signaling is sent to the terminal, the second downlink signaling being used to indicate updated second configuration information.

[0352] In some embodiments, the sending unit 710 is further configured to:

[0353] Send third configuration information to the terminal. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in K SRS resource group configurations, where K is a positive integer.

[0354] In some embodiments, the transmission time information associated with each SRS resource group configuration includes the initial transmission time of a set of SRSs associated with each SRS resource group configuration, or the minimum time difference information between a set of SRSs associated with each SRS resource group configuration and the associated downlink reference signal set.

[0355] In some embodiments, the minimum time difference information between the set of SRSs and the associated set of downlink reference signals is used to indicate the minimum time difference between the set of SRSs and the last downlink reference signal in the set of downlink reference signals associated with the set of SRSs, wherein the last downlink reference signal is the latest downlink reference signal in the set of downlink reference signals.

[0356] In some embodiments, the sending unit 710 is further configured to:

[0357] A third indication message is sent to the terminal, the third indication message being used to indicate the validity period or cycle of the third configuration information.

[0358] In some embodiments, the sending unit 710 is further configured to:

[0359] A third downlink signaling is sent to the terminal, the third downlink signaling being used to indicate updated third configuration information.

[0360] In some embodiments, the sending unit 710 is further configured to:

[0361] Send fourth configuration information to the terminal, the fourth configuration information being used to configure at least one of the following:

[0362] Downlink reference signal packet information, wherein the downlink reference signals in a packet support joint transmission;

[0363] The correlation between the subarray and the downlink reference signal;

[0364] Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP);

[0365] Uplink and downlink time slot configuration associated with downlink reference signal;

[0366] Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals;

[0367] The TRP constraint information indicates at least one of the following: required TRPs, optional TRPs, and unavailable TRPs.

[0368] In some embodiments, the sending unit 710 is further configured to:

[0369] When the target SRS is triggered to transmit, the downlink reference signal set associated with the target SRS is triggered to transmit, wherein the target SRS is an aperiodic SRS and the downlink reference signal set associated with the target SRS includes aperiodic downlink reference signals.

[0370] Optionally, in some embodiments, the above-mentioned transmitting unit and receiving unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip.

[0371] It should be understood that the communication device 700 according to the embodiments of this application can correspond to the network-side device in the method embodiments of this application, and the above and other operations and / or functions of each unit in the communication device 700 are respectively to implement the process executed by the network-side device in the method embodiments shown in FIG4 to FIG7 and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0372] In some embodiments, the devices 600 and 700 in this application may be electronic devices, such as electronic devices with an operating system, or components in electronic devices, such as integrated circuits or chips. The electronic device may be a terminal, or other devices besides a terminal. For example, a terminal may include, but is not limited to, the type of terminal 11 listed above; other devices may be servers, network attached storage (NAS), etc., and this application does not specifically limit the types.

[0373] As shown in Figure 10, this application embodiment also provides a communication device 800, including a processor 801 and a memory 802. The memory 802 stores a program or instructions that can run on the processor 801. For example, when the communication device 800 is a terminal, the program or instructions executed by the processor 801 implement the steps performed by the terminal in the above-mentioned method embodiment for transmitting the detection reference signal SRS, and achieve the same technical effect. When the communication device 800 is a network-side device, the program or instructions executed by the processor 801 implement the various steps performed by the network-side device in the above-mentioned method embodiment for transmitting the detection reference signal SRS, and achieve the same technical effect. To avoid repetition, this will not be described again here.

[0374] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiments shown in Figures 4 to 7. This terminal embodiment corresponds to the above-described terminal-side method embodiments, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 11 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0375] The terminal 900 includes, but is not limited to, at least some of the following components: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, and processor 910.

[0376] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 910 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 11 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0377] It should be understood that, in this embodiment, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042. The GPU 9041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 906 may include a display panel 9061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 907 includes at least one of a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0378] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 901 can transmit it to the processor 910 for processing; in addition, the radio frequency unit 901 can send uplink data to the network-side device. Typically, the radio frequency unit 901 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0379] The memory 909 can be used to store software programs or instructions, as well as various data. The memory 909 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 909 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 909 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0380] Processor 910 may include one or more processing units; optionally, processor 910 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 910.

[0381] The processor 910 is used to obtain the association relationship between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal; and to determine the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted.

[0382] The radio frequency unit 901 is used to transmit the target SRS using the precoded information.

[0383] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the terminal in the method embodiment and achieve the same or corresponding technical effect. To avoid repetition, it will not be described again here.

[0384] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiments shown in Figures 4 to 7. This network-side device embodiment corresponds to the above-described network-side device method embodiments. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effects.

[0385] Specifically, this application embodiment also provides a network-side device. As shown in FIG12, the network-side device 1000 includes: an antenna 1001, a radio frequency device 1002, a baseband device 1003, a processor 1004, and a memory 1005. The antenna 1001 is connected to the radio frequency device 1002. In the uplink direction, the radio frequency device 1002 receives information through the antenna 1001 and sends the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be transmitted and sends it to the radio frequency device 1002, which then processes the received information and transmits it through the antenna 1001.

[0386] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 1003, which includes a baseband processor.

[0387] The baseband device 1003 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG12. One of the chips is, for example, a baseband processor, which is connected to the memory 1005 via a bus interface to call the program in the memory 1005 and execute the network device operation shown in the above method embodiment.

[0388] The network-side device may also include a network interface 1006, such as a Common Public Radio Interface (CPRI).

[0389] In some embodiments, the network-side device 1000 of this application further includes: instructions or programs stored in memory 1005 and executable on processor 1004. The processor 1004 calls the instructions or programs in memory 1005 to execute the steps performed by the network-side device in the method embodiments shown in Figures 4 to 7, and achieves the same technical effect. To avoid repetition, it will not be described in detail here.

[0390] The processors mentioned in the embodiments of this application may include general-purpose processors, special-purpose processors, etc., such as central processing units (CPU), microprocessors, digital signal processors (DSP), artificial intelligence (AI) processors, graphics processing units (GPU), application-specific integrated circuits (ASIC), network processors (NP), field-programmable gate arrays (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc.

[0391] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described method embodiment for transmitting the detection reference signal SRS and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0392] The processor mentioned above is the processor in the terminal or network-side device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0393] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described method embodiment for transmitting the detection reference signal SRS, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0394] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0395] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described method embodiment for transmitting the detection reference signal SRS, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0396] This application also provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method for transmitting a sounding reference signal (SRS) as described above, and the network-side device can be used to perform the steps of the method for transmitting a sounding reference signal (SRS) as described above.

[0397] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0398] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0399] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A method for transmitting a detection reference signal (SRS), wherein, include: The terminal obtains the association between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal; The terminal determines the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted; The terminal uses the precoded information to send the target SRS.

2. The method according to claim 1, wherein, The terminal acquires the correlation between the SRS and the downlink reference signal, including: The terminal acquires a first mapping relationship, which represents the port mapping relationship between SRS and downlink reference signal; Based on the first mapping relationship, the association between the SRS and the downlink reference signal is determined.

3. The method according to claim 2, wherein, The first mapping relationship is included in the Transport Configuration Indicator (TCI) status indication.

4. The method according to claim 1, wherein, The terminal acquires the correlation between the SRS and the downlink reference signal, including: The terminal receives first configuration information from the network-side device. The first configuration information is used to indicate K SRS resource group configurations, where K is a positive integer. Each SRS in each SRS resource group configuration is associated with the same downlink reference signal set. Each SRS resource group configuration is used for the transmission of the SRS in the SRS resource group configuration.

5. The method according to claim 4, wherein, The method further includes: The terminal receives first indication information from the network device side device, the first indication information being used to indicate the validity period or cycle of the first configuration information.

6. The method according to claim 4, wherein, The method further includes: The terminal receives a first downlink signaling from the network device side device, the first downlink signaling being used to indicate updated first configuration information; The terminal updates the first configuration information according to the first downlink signaling.

7. The method according to any one of claims 4-6, wherein, The method further includes: The terminal receives second configuration information from the network-side device. The second configuration information is used to configure the number M of target SRS groups that the terminal sends, or a set of target SRS group indexes. The set of target SRS group indexes includes M SRS group indexes, and each SRS group index is used to indicate an SRS resource group configuration or a set of downlink reference signals associated with the SRS resource group configuration. The target SRS includes M SRS groups, where M is a positive integer.

8. The method according to claim 7, wherein, The method further includes: The terminal receives second indication information from the network device side device, the second indication information being used to indicate the validity period or cycle of the second configuration information.

9. The method according to claim 7, wherein, The method further includes: The terminal receives a second downlink signaling from the network device side device, the second downlink signaling being used to indicate updated second configuration information; The terminal updates the second configuration information according to the second downlink signaling.

10. The method according to any one of claims 7-9, wherein, The method further includes: Based on at least one of the second configuration information and the first information, determine the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS; The first information includes at least one of the following: Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission; The correlation between the subarray and the downlink reference signal; Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP); Uplink and downlink time slot configuration associated with downlink reference signal; Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals; TRP restriction information, used to indicate at least one of the required TRPs, optional TRPs, and unavailable TRPs; At least one wireless channel attribute of a downlink reference signal, wherein the wireless channel attribute includes at least one of Doppler spread, Doppler frequency shift, average delay, delay spread, average gain, and spatial receiver parameters.

11. The method according to any one of claims 7-9, wherein, The step of determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on at least one of the second configuration information and the first information includes: If the second configuration information is used to configure the target SRS group index set, the M SRS resource group configurations indicated by the target SRS group index set are determined as the SRS resource group configurations associated with the target SRS; or, the M downlink reference signal sets indicated by the target SRS group index set are determined as the downlink reference signal set associated with the target SRS; or If the second configuration information is used to configure the target number of SRS groups sent by the terminal, the downlink reference signal set associated with the target SRS or the SRS resource group associated with the target SRS is determined according to the first information.

12. The method according to claim 10 or 11, wherein, The step of determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes: If the first information includes downlink reference signal grouping information, the downlink reference signal in at least one group is measured according to the downlink reference signal grouping information, and the target downlink reference signal in each group is determined according to the measurement results of the downlink reference signal in each group. The set of downlink reference signals associated with the target SRS includes the target downlink signals in each group, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

13. The method according to claim 10 or 11, wherein, The step of determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes: If the first information includes the correlation between the subarray and the downlink reference signal, at least one subarray is measured, and the target subarray in the at least one subarray is determined based on the measurement results of the at least one subarray. The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target subarray, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

14. The method according to claim 10 or 11, wherein, The step of determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes: If the first information includes uplink and downlink time slot configurations of at least one TRP, the target TRP that supports uplink transmission within the target time period of the terminal is determined based on the uplink and downlink time slot configurations of the at least one TRP, wherein the target time period of the terminal is the time period during which the terminal supports uplink transmission. The set of downlink reference signals associated with the target SRS includes the downlink reference signals associated with the target TRP, or the configuration of the SRS resource group associated with the target SRS is determined based on the set of downlink reference signals associated with the target SRS.

15. The method according to claim 10 or 11, wherein, The step of determining the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS based on the first information includes: If the first information includes the radio channel attributes of at least one downlink reference signal, at least one set of downlink reference signals is determined based on the radio channel attributes of the at least one downlink reference signal, wherein the downlink reference signals in each set of downlink reference signals have the same radio channel attributes. The at least one downlink reference signal set is determined as the downlink reference signal set associated with the target SRS, or the SRS resource group configuration associated with the at least one downlink reference signal set is determined as the SRS resource group configuration associated with the target SRS.

16. The method according to any one of claims 10-15, wherein, The terminal uses the precoded information to send the target SRS, including: The terminal uses the SRS resources in the SRS resource group configuration associated with the target SRS and the precoded information to send the target SRS.

17. The method according to any one of claims 1-16, wherein, The method further includes: The terminal receives third configuration information from the network-side device. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in the K SRS resource group configurations, where K is a positive integer.

18. The method according to claim 17, wherein, The transmission time information associated with each SRS resource group configuration includes the initial transmission time of a set of SRSs corresponding to each SRS resource group configuration, or the minimum time difference information between a set of SRSs corresponding to each SRS resource group configuration and the associated downlink reference signal set.

19. The method according to claim 18, wherein, The minimum time difference information between the set of SRS and the associated downlink reference signal set is used to indicate the minimum time difference between the set of SRS and the last downlink reference signal in the set of downlink reference signals associated with the set of SRS, wherein the last downlink reference signal is the latest downlink reference signal in the set of downlink reference signals.

20. The method according to any one of claims 17-19, wherein, The method further includes: The terminal receives third indication information from the network device side device, the third indication information being used to indicate the validity period or cycle of the third configuration information.

21. The method according to any one of claims 17-19, wherein, The method further includes: The terminal receives a third downlink signaling from the network device side device, the third downlink signaling being used to indicate updated third configuration information; The terminal updates the third configuration information according to the third downlink signaling.

22. The method according to any one of claims 1-21, wherein, The method further includes: When the target SRS is triggered to transmit, the terminal triggers to receive the downlink reference signal set associated with the target SRS, wherein the target SRS is an aperiodic SRS, and the downlink reference signal set associated with the target SRS includes aperiodic downlink reference signals.

23. The method according to any one of claims 1-22, wherein, The method further includes: The transmit power of the target SRS is determined based on the path loss of each downlink reference signal in the set of downlink reference signals associated with the target SRS.

24. The method according to claim 23, wherein, Determining the transmit power of the target SRS based on the path loss of each downlink reference signal in the set of downlink reference signals associated with the target SRS includes: The transmit power of the target SRS is determined based on the minimum path loss, maximum path loss, average path loss, or joint path loss of the downlink reference signals in the downlink reference signal set, wherein the joint path loss is determined based on the receive power calculated by the terminal for joint reception of the downlink reference signals in the downlink reference signal set.

25. The method according to any one of claims 1-24, wherein, The terminal determines the precoding information of the target SRS based on the downlink reference signal set associated with the target SRS to be transmitted, including: The terminal determines the precoding information of the target SRS based on the total number of ports of all downlink reference signals in the downlink reference signal set associated with the target SRS to be transmitted; or The terminal determines at least one first precoding information based on the number of ports of each downlink reference signal in the set of downlink reference signals associated with the target SRS to be transmitted, and determines the precoding information of the target SRS based on the at least one first precoding information; or The terminal determines second precoding information based on the number of ports of the first downlink reference signal in the downlink reference signal set associated with the target SRS to be transmitted, and determines the precoding information of the target SRS based on the second precoding information, wherein the first downlink reference signal includes at least one downlink reference signal in the downlink reference signal set associated with the target SRS.

26. The method according to claim 4 or 17, wherein, The SRS resource group configuration includes an associated downlink reference signal indication.

27. The method according to claim 4 or 17, wherein, The SRS resource group configuration is used to indicate the set of downlink reference signals associated with the SRS in the SRS resource group configuration.

28. A method for transmitting a detection reference signal (SRS), wherein, include: The network-side device indicates the association between the SRS and the downlink reference signal to the terminal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal; The network-side device receives the target SRS sent by the terminal, wherein the precoding information of the target SRS is determined based on the downlink reference signal set associated with the target SRS.

29. The method according to claim 28, wherein, The network-side device indicates the association between the SRS and the downlink reference signal to the terminal, including: The network-side device indicates a first mapping relationship to the terminal. The first mapping relationship represents the port mapping relationship between the SRS and the downlink reference signal. The first mapping relationship is used to determine the association relationship between the SRS and the downlink reference signal.

30. The method according to claim 28, wherein, The network-side device indicates the association between the SRS and the downlink reference signal to the terminal, including: The network-side device sends first configuration information to the terminal. The first configuration information is used to configure K SRS resource group configurations, wherein each SRS in the SRS resource group configuration is associated with a downlink reference signal set, and K is a positive integer.

31. The method according to claim 30, wherein, The method further includes: The network-side device sends a first indication message to the terminal, the first indication message being used to indicate the effective time or period of the first configuration information.

32. The method according to claim 30, wherein, The method further includes: The network-side device sends a first downlink signaling to the terminal, the first downlink signaling being used to indicate updated first configuration information.

33. The method according to any one of claims 30-32, wherein, The method further includes: The network-side device sends second configuration information to the terminal. The second configuration information is used to configure the number M of target SRS groups that the terminal sends, or a set of target SRS group indices. The set of target SRS group indices includes M SRS group indices, and each SRS group index is used to indicate an SRS resource group configuration or a set of downlink reference signals associated with the SRS resource group configuration. The target SRS includes M SRS groups, where M is a positive integer.

34. The method according to claim 33, wherein, The method further includes: The network-side device sends a second indication message to the terminal, the second indication message being used to indicate the validity period or cycle of the second configuration information.

35. The method according to claim 33, wherein, The method further includes: The network-side device sends a second downlink signaling to the terminal, the second downlink signaling being used to indicate updated second configuration information.

36. The method according to any one of claims 28-35, wherein, The method further includes: The network-side device sends third configuration information to the terminal. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in the K SRS resource group configurations, where K is a positive integer.

37. The method according to claim 36, wherein, The transmission time information associated with each SRS resource group configuration includes the initial transmission time of a set of SRSs associated with each SRS resource group configuration, or the minimum time difference information between a set of SRSs associated with each SRS resource group configuration and the associated downlink reference signal set.

38. The method according to any one of claims 36-37, wherein, The method further includes: The network-side device sends a third indication information to the terminal, the third indication information being used to indicate the effective time or period of the third configuration information.

39. The method according to any one of claims 36-37, wherein, The method further includes: The network-side device sends a third downlink signaling to the terminal, the third downlink signaling being used to indicate updated third configuration information.

40. The method according to any one of claims 28-39, wherein, The method further includes: The network-side device sends fourth configuration information to the terminal, the fourth configuration information being used to configure at least one of the following: Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission; The correlation between the subarray and the downlink reference signal; Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP); Uplink and downlink time slot configuration associated with downlink reference signal; Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals; The TRP constraint information indicates at least one of the following: required TRPs, optional TRPs, and unavailable TRPs.

41. The method according to any one of claims 28-40, wherein, The method further includes: When the target SRS is triggered for transmission, the network-side device triggers the transmission of the downlink reference signal set associated with the target SRS, wherein the target SRS is an aperiodic SRS, and the downlink reference signal set associated with the target SRS includes aperiodic downlink reference signals.

42. The method according to claim 30 or 36, wherein, The SRS resource group configuration includes an associated downlink reference signal indication.

43. The method according to claim 30 or 36, wherein, The SRS resource group configuration is used to indicate the set of downlink reference signals associated with the SRS in the SRS resource group configuration.

44. A communication device, wherein, include: The processing unit is configured to acquire the association relationship between SRS and downlink reference signals, wherein one SRS is associated with one set of downlink reference signals, and one set of downlink reference signals includes at least one downlink reference signal; and to determine the precoding information of the target SRS based on the set of downlink reference signals associated with the target SRS to be transmitted. A communication unit is used to transmit the target SRS using the precoded information.

45. The communication device according to claim 44, wherein, The processing unit is also used for: Obtain the first mapping relationship, which represents the port mapping relationship between SRS and downlink reference signal; Based on the first mapping relationship, the association between the SRS and the downlink reference signal is determined.

46. ​​The communication device according to claim 44, wherein, The communication unit is also used for: The network-side device receives first configuration information, which is used to indicate K SRS resource group configurations, where K is a positive integer. Each SRS in each SRS resource group configuration is associated with the same downlink reference signal set, and each SRS resource group configuration is used for the transmission of the SRS in the SRS resource group configuration.

47. The communication device according to claim 46, wherein, The communication unit is also used for: The network-side device receives second configuration information, which is used to configure the number M of target SRS groups to be sent by the communication device, or a set of target SRS group indices. The set of target SRS group indices includes M SRS group indices, and each SRS group index is used to indicate an SRS resource group configuration or a set of downlink reference signals associated with the SRS resource group configuration. The target SRS includes M SRS groups, where M is a positive integer.

48. The communication device according to claim 46 or 47, wherein, The processing unit is also used for: Based on at least one of the second configuration information and the first information, determine the downlink reference signal set associated with the target SRS or the SRS resource group configuration associated with the target SRS; The first information includes at least one of the following: Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission; The correlation between the subarray and the downlink reference signal; Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP); Uplink and downlink time slot configuration associated with downlink reference signal; Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals; TRP restriction information, used to indicate at least one of the required TRPs, optional TRPs, and unavailable TRPs; At least one wireless channel attribute of a downlink reference signal, wherein the wireless channel attribute includes at least one of Doppler spread, Doppler frequency shift, average delay, delay spread, average gain, and spatial receiver parameters.

49. The communication device according to claim 48, wherein, The communication unit is also used for: The target SRS is sent using the SRS resources in the SRS resource group configuration associated with the target SRS and the precoded information.

50. The communication device according to any one of claims 46-49, wherein, The communication unit is also used for: Receive third configuration information from the network-side device. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in K SRS resource group configurations, where K is a positive integer.

51. The communication device according to any one of claims 44-50, wherein, The processing unit is also used for: The transmit power of the target SRS is determined based on the path loss of each downlink reference signal in the set of downlink reference signals associated with the target SRS.

52. The communication device according to claim 51, wherein, The processing unit is also used for: The transmit power of the target SRS is determined based on the minimum path loss, maximum path loss, average path loss, or joint path loss of the downlink reference signals in the downlink reference signal set, wherein the joint path loss is determined based on the receive power calculated by the communication device for joint reception of the downlink reference signals in the downlink reference signal set.

53. The communication device according to any one of claims 44-52, wherein, The processing unit is also used for: The precoding information of the target SRS is determined based on the total number of ports of all downlink reference signals in the downlink reference signal set associated with the target SRS to be transmitted; or Based on the number of ports of each downlink reference signal in the set of downlink reference signals associated with the target SRS to be transmitted, at least one first precoding information is determined, and based on the at least one first precoding information, the precoding information of the target SRS is determined; or Based on the number of ports of the first downlink reference signal in the downlink reference signal set associated with the target SRS to be transmitted, second precoding information is determined, and based on the second precoding information, precoding information of the target SRS is determined, wherein the first downlink reference signal includes at least one downlink reference signal in the downlink reference signal set associated with the target SRS.

54. A communication device, wherein, include: The transmitting unit is used to indicate to the terminal the association relationship between the SRS and the downlink reference signal, wherein one SRS is associated with one downlink reference signal set, and one downlink reference signal set includes at least one downlink reference signal; A receiving unit is configured to receive a target SRS sent by the terminal, wherein the precoding information of the target SRS is determined based on the downlink reference signal set associated with the target SRS.

55. The communication device according to claim 54, wherein, The transmitting unit is further configured to: The terminal is instructed to indicate a first mapping relationship, which represents the port mapping relationship between the SRS and the downlink reference signal. The first mapping relationship is used to determine the association relationship between the SRS and the downlink reference signal.

56. The communication device according to claim 54, wherein, The transmitting unit is further configured to: Send first configuration information to the terminal. The first configuration information is used to configure K SRS resource group configurations, wherein each SRS in each SRS resource group configuration is associated with the same downlink reference signal set, and K is a positive integer.

57. The communication device according to claim 56, wherein, The transmitting unit is further configured to: Send second configuration information to the terminal. The second configuration information is used to configure the number M of target groups for the terminal to send SRS, or a set of target SRS group indexes. The set of target SRS group indexes includes M SRS group indexes. Each SRS group index is used to indicate an SRS resource group configuration or a set of downlink reference signals associated with the SRS resource group configuration. The target SRS includes M SRS groups, where M is a positive integer.

58. The communication device according to claim 56 or 57, wherein, The transmitting unit is further configured to: Send third configuration information to the terminal. The third configuration information is used to configure the transmission time information associated with each SRS resource group configuration in K SRS resource group configurations, where K is a positive integer.

59. The communication device according to any one of claims 54-58, wherein, The transmitting unit is further configured to: Send fourth configuration information to the terminal, the fourth configuration information being used to configure at least one of the following: Downlink reference signal packet information, wherein the downlink reference signal in a packet supports joint transmission; The correlation between the subarray and the downlink reference signal; Uplink and downlink time slot configuration of at least one Transmitter / Receiver Point (TRP); Uplink and downlink time slot configuration associated with downlink reference signal; Downlink reference signal limitation information, used to indicate at least one of mandatory downlink reference signals, optional downlink reference signals, and unavailable downlink reference signals; The TRP constraint information indicates at least one of the following: required TRPs, optional TRPs, and unavailable TRPs.

60. The communication device according to any one of claims 54-59, wherein, The transmitting unit is further configured to: When the target SRS is triggered to transmit, the downlink reference signal set associated with the target SRS is triggered to transmit, wherein the target SRS is an aperiodic SRS and the downlink reference signal set associated with the target SRS includes aperiodic downlink reference signals.

61. A communication device, wherein, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as claimed in any one of claims 1 to 27, or the steps of the method as claimed in any one of claims 28 to 43.

62. A readable storage medium, wherein, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method as claimed in any one of claims 1 to 27, or the steps of the method as claimed in any one of claims 28 to 43.

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