Methods and systems for improved sounding reference signal (SRS) overhead and flexible reuse schemes

Abstract

Methods and systems for transmitting one or more sounding reference signal (SRS) resource sets for one or more uses are disclosed herein. In one embodiment, a method performed by a user equipment includes receiving one or more configuration parameters from a wireless network node; determining one or more uses of a plurality of SRS resources in one or more SRS resource sets based on the one or more configuration parameters; and transmitting SRS with the plurality of SRS resources configured for the one or more uses.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications, and more particularly, to methods and systems for sounding reference signal configuration to support uplink and downlink transmissions. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., time, bandwidth, and / or transmit power). Examples of these multiple access technologies include 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), time division synchronous code division multiple access (TD-SCDMA), and long term evolution (LTE).

[0003] A wireless communication network may include multiple base stations (BSs) that support communication with multiple user equipment (UEs). UEs may communicate with a base station via a downlink (DL) (or forward link) and an uplink (UL) (or reverse link). DL refers to the communication link from the BS to the UE, and UL refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNode B (gNB), access point (AP), radio head, transmission reception point (TRP), new radio (NR) BS, 5G Node B, etc.

[0004] The aforementioned multiple access technologies have been adopted in various telecommunications standards, which provide a common protocol that enables different user devices to communicate across various geographic locations. 5G NR (New Radio) is a multiple access technology designed for 5G (fifth-generation) mobile networks, promulgated by the Third Generation Partnership Project (3GPP). 5G NR offers higher data rates and greater capacity with improved reliability and lower latency, thereby enhancing mobile broadband services. 5G NR also enables new service categories for in-vehicle, fixed wireless broadband, and the Internet of Things (IoT).

[0005] To support higher data rates, 5G NR uses a multiple-input multiple-output (MIMO) antenna system to beamform signals transmitted between the base station and the user equipment terminal (UE). MIMO systems can provide improved performance (e.g., higher throughput and / or greater reliability) by utilizing the additional dimensions created by multiple transmit and receive antennas. However, 5G NR using a MIMO system may exhibit undesirable propagation phenomena, such as multipath, which may cause radio signals to reach the receiving antenna via two or more paths. Therefore, a key requirement for enjoying the benefits of MIMO technology is to obtain accurate channel state information (CSI) for each radio link.

[0006] One way to obtain CSI at the transmitter of the BS is by using an uplink (UL) channel. Channel sensing is a signaling mechanism in which the UE transmits a pilot signal or a sounding reference signal (SRS) on the UL channel to enable the BS to estimate the UL channel response. This method assumes reciprocity between the uplink and downlink (DL) channels, which is typically present in time division duplex (TDD) systems. In addition, the number of UL SRSs required in the above-mentioned method for DL ​​channel estimation is proportional to the number of UEs served and is independent of the number of BS antennas.

[0007] In addition, to obtain wideband or subband CSI of the UL channel, the BS can use SRS to assist the UL Medium Access Control (MAC) scheduler in allocating UEs to resource blocks (RBs). The base station can use SRS to allocate uplink resources to the transmission terminal.

[0008] In current 5G NR wireless communication systems, channel sensing with SRS supports various use cases. For example, SRS can be utilized only at the BS to obtain signal strength measurements, for example for UL beam management purposes. On the other hand, SRS can be utilized at the BS to obtain detailed amplitude and phase estimates as a function of frequency, time, and space. Other uses of SRS include UL CSI acquisition in codebook / non-codebook mode. Reciprocity between downlink and uplink channels cannot be assumed in the codebook scenario, while reciprocity between downlink and uplink channels can be assumed in the non-codebook scenario. Yet another use of SRS is uplink beam management based on a set of SRS resources transmitted by the UE to the BS. In current 5G NR wireless communication systems, SRS is configured in an SRS resource set comprising one or more SRS resources. In addition, in current 5G NR wireless communication systems, the SRS resource set contains a parameter called "purpose", which specifies a single purpose of the SRS resource set that is suitable for the indicated use case.

[0009] In this context, assigning UEs to UL SRS becomes crucial in 5G standardization work, as it can significantly impact system performance. Because the number of UL SRSs for a given bandwidth is limited, and because the number of reused UEs can be significantly larger than in existing systems, significant resource overhead is incurred. Therefore, UL SRS reuse methods and systems are needed to reduce resource overhead.

[0010] In addition, in the current 5G NR and 3GPP LTE-Advanced (LTE-A) wireless communication systems, two types of SRS are defined. The first type of periodic SRS (p-SRS) is used to obtain long-term channel information. The period of p-SRS is usually longer (up to 320ms) to reduce overhead. The p-SRS parameters are configured by the higher-layer radio resource control (RRC), so the configuration time is longer (for example, 15-20ms), resulting in lower signaling flexibility. For uplink MIMO, closed-loop spatial multiplexing requires p-SRS resources, especially when the number of UEs becomes large. The second type of aperiodic SRS (ap-SRS) is a new feature triggered by a downlink or uplink grant via the physical downlink control channel (PDCCH). Once triggered, the UE transmits a sounding sequence at a predetermined position for one-time transmission. Ap-SRS supports multi-antenna sounding for uplink MIMO. Ap-SRS is much more flexible than p-SRS. Thus, the predetermined location for a one-time transmission of the ap-SRS is defined by a number of slot offsets triggered by the receipt of downlink control information (DCI) carried in the PDCCH. However, this predetermined location for a one-time transmission of the ap-SRS is limited because it only allows one SRS resource to occupy consecutive OFDM symbols in one slot. Therefore, there is a need for enhanced aperiodic SRS triggering. Summary of the Invention

[0011] The exemplary embodiments disclosed herein are intended to solve problems related to one or more problems arising in the prior art, as well as to provide additional features that will become apparent when reference is made to the following detailed description in conjunction with the accompanying drawings. According to various embodiments, exemplary systems, methods, devices, and computer program products are disclosed herein. However, it should be understood that these embodiments are presented by way of example and not limitation, and it will be apparent to those of ordinary skill in the art who have read this disclosure that various modifications may be made to the disclosed embodiments without departing from the scope of this disclosure.

[0012] In one embodiment, a method performed by a user equipment for transmitting one or more sounding reference signal (SRS) resource sets for one or more purposes includes: receiving one or more configuration parameters from a wireless network node; determining one or more purposes of multiple SRS resources in one or more SRS resource sets based on the one or more configuration parameters; and transmitting SRS using the multiple SRS resources configured for the one or more purposes.

[0013] In another embodiment, a method performed by a base station for receiving one or more sets of sounding reference signal (SRS) resources configured for one or more purposes includes: transmitting one or more configuration parameters to a user equipment; and receiving SRS from a plurality of SRS resources configured by a user equipment (UE), wherein the plurality of SRS resources are configured for one or more purposes.

[0014] In a further embodiment, a method for transmitting a non-periodic sounding reference signal (SRS) performed by a user equipment includes: receiving a time slot offset of an SRS resource or an SRS resource subset in an SRS resource set, wherein the time slot offset indicates a time position relative to a reception time slot of downlink control information (DCI) when the non-periodic SRS transmission is triggered; receiving the DCI; and transmitting each SRS resource in the SRS resource subset or the SRS resource set at a time corresponding to the time slot offset.

[0015] In a further embodiment, a method for transmitting a sounding reference signal (SRS) performed by a user equipment includes: receiving one or more configuration parameters and a bitmap indicating OFDM symbol selection, the one or more configuration parameters indicating at least one of one or more starting positions of one or more sets of consecutive orthogonal frequency division multiplexing (OFDM) symbols or consecutive uplink (UL) OFDM symbols; determining a set of time domain resources for transmitting the SRS based on the one or more configuration parameters; and transmitting the SRS within the set of time domain resources.

[0016] In a further embodiment, the present disclosure provides an apparatus configured to perform any of the methods disclosed herein.

[0017] In a further embodiment, the present disclosure provides a non-transitory computer-readable storage medium storing computer-executable instructions, which when executed perform any of the methods disclosed herein.

[0018] In a further embodiment, a wireless communication node includes: a memory storing computer-executable instructions that, when executed, perform any of the methods disclosed herein; and at least one processor coupled to the memory and configured to execute the computer-executable instructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various exemplary embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The drawings are for illustrative purposes only and depict only exemplary embodiments of the present disclosure to facilitate the reader's understanding of the present disclosure. Therefore, the drawings should not be construed as limiting the breadth, scope, or applicability of the present disclosure. It should be noted that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

[0020] FIG. 1A is a block diagram illustrating an example of a wireless communication network according to some embodiments of the present disclosure.

[0021] FIG. 1B is a block diagram illustrating an example of a wireless communication network according to some embodiments of the present disclosure.

[0022] FIG. 2 is a block diagram illustrating an example of a sounding reference signal (SRS) configuration supporting multiple usages according to various embodiments of the present disclosure.

[0023] FIG. 3A An SRS resource set with two SRS time-frequency resources according to some embodiments of the present disclosure is shown.

[0024] FIG. 3B An SRS resource having two antenna ports and configured for antenna switching and codebook use cases according to a further embodiment of the present disclosure is shown.

[0025] FIG. 3C A timing diagram of physical uplink shared channel (PUSCH) transmission corresponding to SRS resources having one or more usages according to further embodiments of the present disclosure is shown.

[0026] FIG. 4A - FIG. 4C A timing diagram of SRS resource allocation according to various embodiments of the present disclosure is shown.

[0027] FIG. 5A - FIG. 5B A block diagram of a radio frequency (RF) transceiver chain is shown, according to some embodiments of the present disclosure.

[0028] FIG. 6 is a block diagram of a flowchart of a method for transmitting one or more sounding reference signal (SRS) resource sets for one or more purposes according to various embodiments of the present disclosure.

[0029] FIG. 7 A block diagram illustrating a flowchart of a method for transmitting an aperiodic sounding reference signal (SRS) according to various embodiments of the present disclosure.

[0030] FIG. 8A block diagram of a wireless communication node configured to perform the methods disclosed herein according to various embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings to enable those of ordinary skill in the art to implement and use the present disclosure. It will be apparent to those of ordinary skill in the art that, after reading this disclosure, various changes or modifications may be made to the examples described herein without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. In addition, the specific order and / or hierarchy of steps in the methods disclosed herein are merely exemplary methods. Based on design preferences, the specific order or hierarchy of steps of the disclosed methods or processes may be rearranged without departing from the scope of the present disclosure. Therefore, it will be understood by those of ordinary skill in the art that the methods and techniques disclosed herein present various steps or actions in an example order, and unless expressly stated otherwise, the present disclosure is not limited to the specific order or hierarchy presented.

[0032] As discussed herein, a "wireless communication node" may include or be implemented as a next generation node B (gNB), an E-UTRAN node B (eNB), a transmission reception point (TRP), an access point (AP), a donor node (DN), a relay node, a core network (CN) node, a RAN node, a master node, a slave node, a distributed unit (DU), a centralized unit (CU), etc., which is consistent with the customary understanding of these terms in the art. In addition, as discussed herein, a "wireless communication device" may include or be implemented as a station (STA), a mobile terminal (MT), a mobile station (MS), etc., which is consistent with the customary understanding of these terms in the art. In the description of the following exemplary embodiments, a "wireless communication node" is referred to as a base station "BS" and a "wireless communication device" is referred to as a user equipment "UE". However, it should be understood that the scope of the present disclosure is not limited to these exemplary embodiments.

[0033] FIG. 1AAn example of a wireless communication network 100A according to various embodiments of the present disclosure is shown. The wireless communication network 100A may be an LTE network or some other wireless network, such as a 5G NR network. The wireless communication network 100A may include multiple BSs 103 and multiple UEs 101. In some embodiments, the BSs 103 may perform one or more of the following functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, non-access stratum (NAS) message distribution, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), user and device tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages.

[0034] In addition, each BS 103 can provide communication coverage for a specific geographic area 105. In some embodiments, the geographic area covered by the BS and / or BS subsystem serving that geographic area can be referred to as a "cell." Overlapping geographic coverage areas 105 can exist. In other embodiments, the BSs 103 can be interconnected with each other and / or to one or more other BSs via various types of backhaul links 107. The backhaul links 107 can include interfaces using any suitable transport network, such as direct physical connections, virtual networks, etc. The backhaul links 107 can be wired or wireless.

[0035] The wireless communication network 100A may be a heterogeneous network including different types of BSs 103 (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmission power levels, different coverage areas, and different impacts on interference in the wireless communication network 100A. For example, a macro BS may have a higher transmission power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmission power level (e.g., 0.1 to 2 watts).

[0036] The UEs 101 may be dispersed throughout the wireless network 100A, and each UE may be fixed or mobile. The UEs may be cellular phones (e.g., smartphones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptop computers, cordless phones, wireless local loop (WLL) stations, tablet computers, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wristbands, and smart jewelry (e.g., smart rings and smart bracelets)), entertainment devices (e.g., music or video devices or satellite radios), vehicle components or sensors, smart meters / sensors, industrial manufacturing equipment, global positioning system devices, or any other suitable device configured to communicate via a wireless or wired medium.

[0037] FIG. 1B 1 is a diagram illustrating an example 100B of a sounding reference signal (SRS) configuration according to various embodiments of the present disclosure. In some embodiments, base station 103 may configure UE 101 with one or more sounding reference signal (SRS) resource sets. In various embodiments, SRS resources are configured in an SRS resource set consisting of one or more SRS resources. Because multiple resources can be activated / triggered simultaneously, this configuration mechanism simplifies activation (e.g., semi-persistent) and DCI triggering (e.g., aperiodic SRS).

[0038] Reference again FIG. 1B In some embodiments, BS 103 may configure UE 101 with one or more SRS resource sets to allocate resources for SRS transmissions by UE 101. For example, BS 103 may transmit one or more configuration parameters or an indication of SRS resource set 107 to UE 101. In further embodiments, the one or more configuration parameters may be carried in a radio resource control (RRC) message (e.g., an RRC configuration message and an RRC reconfiguration message). In some embodiments, the one or more configuration parameters or RRC messages transmitted from BS 103 may specify a parameter referred to as "usage." Depending on the usage parameter, the SRS resource set may have different configurations suitable for the indicated use case. For example, the SRS resource set may be configured to have different usages, such as "antenna switching," "codebook," "non-codebook," and "beam management." In other embodiments, the SRS resource set may be configured to have multiple usages. For example, the SRS resource set may be configured to have both "codebook" and "beam management" usages. One exemplary advantage of reusing SRS resources for different usages is that it reduces the overhead consumption of SRS resources.

[0039] As shown by reference numeral 109, UE 101 may transmit the configured SRS to the BSs, which may utilize the received SRS to determine uplink channel quality under channel reciprocity, link adaptation, or downlink scheduling. In a further embodiment, the BSs may utilize the received SRS to allocate uplink resources to the transmitting UE.

[0040] FIG. 2 An example of a sounding reference signal (SRS) configuration scheme 200 that can support multiple uses is shown. In some embodiments, the configuration information 203 of the SRS resource set 201 may indicate one or more time-frequency resources in which the SRS is to be transmitted, and may indicate one or more antenna ports for transmitting the SRS in these time-frequency resources. In other embodiments, the configuration of the SRS resource set may indicate a use case of the SRS resource set 205 (e.g., in an SRS resource set usage = {antenna switching, codebook, beam management} information element). For example, the BS 103 may configure one or more SRS resource sets 201 with the configuration information 203 indicating multiple uses of the SRS resource set 205. In some embodiments, a usage list may be configured for the SRS resource set 201, indicating that all or part of the SRS resources in the SRS resource set 201 are used for antenna switching, codebook-based UL, and beam management.

[0041] In a further embodiment, a bitmap may be configured for one or more SRS resource sets to indicate use cases for all or a subset of the SRS resources in the configured SRS resource set. For example, from the set of SRS resource uses {"antenna switching", "codebook", "non-codebook", "beam management"}, "1001" in the bitmap may indicate that the uses {"antenna switching" and "beam management"} are selected from the set of SRS resource uses for all or a subset of the SRS resources in the configured SRS resource set.

[0042] In yet another embodiment, a combined usage parameter may be defined to indicate multiple usages of all or a subset of the SRS resources in the configured SRS resource set. For example, the combined usage parameter "antenna switching and codebook" may be configured to indicate that all or a subset of the SRS resources in the configured SRS resource set are used for antenna switching and codebook-based UL use cases.

[0043] An antenna switching SRS resource set can be used to indicate downlink channel state information (CSI) with reciprocity between uplink and downlink channels. For example, BS 103 can configure one or more SRS resource sets 201 with usage parameter 203 including an“antenna switching” value. The number of SRS resource sets configured for antenna switching depends on the capability of UE 101, which can be expressed in terms of the number of Tx (e.g., transmit) and Rx (e.g., receive) antenna chains available at the same time. In some embodiments, UE 101 is capable of transmitting in the uplink on as many antennas as BS 103 uses for reception in the downlink at the same time. For example, BS 103 can configure UE 101 with an SRS resource set including SRS resources for which the number of SRS ports is equal to the number of UE antenna ports using configuration parameters 203. After receiving SRS from UE 101, BS 103 can obtain downlink CSI based on the estimation of the full UL spatial channel of the configured SRS resources. In this embodiment, UE 101 can indicate its capability according to a set of values: 1T1R, 2T2R, and 4T4R, where“T” represents transmit chains (Tx antennas) and“R” represents receive chains (Rx antennas).

[0044] In other embodiments, UE 101 can not be capable of transmitting on as many antennas as the number of receive antennas, and can perform partial sounding through antenna switching. For example, if UE 101 has four receive antennas but can only transmit on two of them at the same time, the UE can indicate“2T4R” in its capability exchange. That is, to obtain CSI for the full spatial channel, BS 103 can request UE 101 to first transmit a first two-port SRS resource on a first UE antenna port during a first time instance, followed by a second two-port SRS resource on a second UE antenna port in a later time instance. As another example, for an SRS resource set configured for“2T4R” antenna switching, two SRS resources in the SRS resource set are configured, and each SRS resource can include a two-port SRS resource. In further embodiments, an SRS resource set for xTyR antenna switching (where x is the number of transmit antennas and y is the number of receive antennas) and y / x or ( the ceiling of y / x) SRS resources are configured, and each SRS resource can include an x-port SRS resource, where x and y are integers. For example, x can be 1, 2, or 4, and y can be 1, 2, 4, 6, or 8.

[0045] When the base station 103 indicates an uplink precoder (e.g., a precoding matrix or weights) to the UE 101, the codebook SRS resource set can be used to indicate uplink CSI. For example, when the base station 103 is configured to indicate an uplink precoder to the UE 101 (e.g., using a precoder codebook), the base station 103 can utilize a codebook SRS (e.g., an SRS transmitted with one of the resources of the codebook SRS resource set) to obtain uplink CSI.

[0046] When the UE 101 selects an uplink precoding weight to use by the UE 101 (e.g., instead of an uplink precoding weight indicated by the BS 103), the non-codebook SRS resource set can be used to indicate uplink CSI. In this regard, the precoding weights are determined at the UE based on reception of associated CSI-RS resources with the DL-UL reciprocity assumption. In some embodiments, when the UE 101 is configured to select an uplink precoder (e.g., an uplink precoding weight), the BS 103 can use a non-codebook SRS (e.g., an SRS transmitted with a resource of the non-codebook SRS resource set) to obtain uplink CSI.

[0047] The beam management SRS resource set can be used to indicate CSI for millimeter wave communications. As such, to support uplink beam management, one or more sets of SRS resources 201 with a usage parameter 203 including a "beam management" value can be configured. In some embodiments, if the UE maintains a fixed spatial domain transmit filter across this set of SRS resources, the BS can adjust its spatial domain receive filter (receive beam) to optimize reception.

[0048] In some embodiments, one or more SRS resources of a set of SRS resources configured for one or more usages can include one or more SRS resource ports. Further, different SRS resources can have the same or different number of SRS resource ports.

[0049] FIG. 3A An SRS resource set 300A with two SRS time-frequency resources is shown. In some embodiments, only a subset of the SRS resources in the SRS resource set 300A can be configured for one or more usages. As such, the UE 101 can determine the subset of SRS resources configured for one or more usages based on a predetermined rule or configuration parameters received from the BS 103. For example, as shown, the SRS resource 301 and the SRS resource 303 within the SRS resource set 300A each have two antenna ports. In this embodiment, the SRS resource 301 and the SRS resource 303 can both be used for antenna switching, while the SRS resource 303 can also be used for codebook-based UL. FIG. 3A

[0050] ​In some embodiments of the present disclosure, the UE 101 may determine a set of N usages {U1, U2, ..., U N In various embodiments, the UE 101 may determine the mapping between the usage set and one or more SRS resources based on a predetermined rule. For example, the first usage U1 from the usage set may be mapped to all SRS resources in the SRS resource set, the second usage U2 may be mapped to the first X2 SRS resource with the lowest SRS resource ID in the SRS resource set, and the remaining usages in the usage set may be mapped to SRS resources in the SRS resource set in a similar manner. In further embodiments, X2, X3, ..., X N SRS resources are integers, where X2, X3, ..., X N The sorting is as follows:

[0051] X2≥X3≥…≥X N .

[0052] In various embodiments of the present disclosure, UE 101 may determine a set {U1, U2, ..., U N} and SRS resources. For example, the first usage U1 from the usage set may be mapped to all SRS resources in the SRS resource set. BS 103 may also configure one or more configuration parameters that indicate which resources may be used for usage U1. i , where 2≤i≤N. In some embodiments, BS 103 may be configured with one or more bitmaps or resource IDs configured to select the resource IDs used for U i SRS resources.

[0053] like FIG. 2 As shown, the SRS resource set 205 can be configured to have an antenna switching use case. In some embodiments, the SRS resource set with antenna switching use case may include a first SRS resource 301 and a second SRS resource 303, such as FIG. 3A Therefore, the antenna switching SRS may be transmitted in SRS resource 301 (e.g., the first time-frequency resource) using two antenna ports (e.g., antenna port 0 and antenna port 1), and the antenna switching SRS may be transmitted in SRS resource 303 (e.g., the second time-frequency resource) using two antenna ports (e.g., antenna port 2 and antenna port 3).

[0054] However, in some embodiments, it is contemplated that there can be some special cases where the UE can have different types of antenna switching capabilities due to having a limited number of radio frequency (RF) chains or due to original equipment manufacturer (OEM) products having limited antenna switching capabilities. For example, multiple antenna switching capabilities can include various combinations of transmit (Tx) antennas and receive (Rx) antennas. Specifically, a UE can be configured to support at least two antenna switching capabilities from a set consisting of {(x, y), where x := 1, 2, 4, y := 1, 2, 4, 6, 8}, where capability (x, y) indicates support for x transmit (Tx) antennas and y receive (Rx) antennas. For example, a UE can indicate that it supports 1T2R and 2T4R antenna switching capabilities.

[0055] In some embodiments, the BS can configure one or more SRS resource sets for one or more antenna switching capabilities from the set {(x, y)}. For example, if the UE supports at least two combinations (e.g., (x1, y1) and (x2, y2), where x1 is less than x2), the BS can configure the UE with antenna switching capability (x1, y1), which can result in the UE not using its full transmission power for SRS transmission. Thus, the BS can need more information to accurately configure the UE. In some embodiments, the UE’s capability information can be reported to the BS in UE capability signaling.

[0056] In some embodiments, the UE can report to the BS its capability of sharing transmission power among one or more antennas for SRS transmission. In this regard, the UE can signal its capability to the BS by reporting whether the maximum transmission power of N1-antenna SRS is equal to the maximum transmission power of N2-antenna SRS, where N1 and N2 are integers indicating the number of UE antennas, and N1 is less than N2. For example, N2 is K times N1, where K is an integer greater than 1. In various other embodiments, the UE can signal its capability to the BS by reporting a ratio between the maximum transmission power of N1-antenna SRS and the maximum transmission power of N2-antenna SRS, where N1 and N2 are integers, and N1 is less than N2. Specifically, the UE can report a ratio K = N2 / N1, where K is an integer greater than 1. In other embodiments, the ratio can be at least 1 / 4, 1 / 2, and 1. In further embodiments, the UE can report a minimum number of antennas for SRS transmission for which full transmission power can be achieved. In other embodiments, the UE can report to the BS a maximum or minimum supported transmission power scaling value for SRS transmission.

[0057] In some embodiments, the UE may have different capabilities for various uses. For example, for an antenna switching use case, the UE 101 may support up to A1 antennas (or antenna ports), while for another use case (e.g., UL transmissions including codebook, non-codebook, and / or beam management), the UE 101 may also support up to A2 antennas (or antenna ports). In some embodiments, the number of antenna ports in different SRS resources in an SRS resource set may vary. FIG. 3B The above exemplary embodiment is shown, wherein the SRS resource set 300B It includes two SRS time-frequency resources with different numbers of antenna ports. In particular, FIG. 3B An SRS resource 311 is shown, which has antenna port 305 and antenna port 307 and is configured for antenna switching and codebook use cases. 300C Also included is an SRS resource 309 having a single antenna port 305 and configured for an antenna switching use case. In some embodiments, UE 101 may determine which antenna ports in the SRS resource may be configured for a first purpose from a set of purposes. For example, UE 101 may determine, based on a predetermined rule, the antenna ports configured in the SRS resource for the first purpose and the second purpose. In some embodiments, UE 101 may configure a predetermined number of antenna ports (e.g., with the lowest ID) for the first purpose. In other embodiments, UE 101 may configure the antenna ports of the SRS resource for the first purpose based on one or more configuration parameters received from BS 103. In further embodiments, the one or more configuration parameters may be one or more bitmaps. In other embodiments, if at least two SRS resources for different purposes are transmitted in overlapping resources, then for the two SRS resources, the antenna ports with the same port index are the same port. For example, the overlapping SRS resources may be antenna ports, frequencies, time, and / or code domain resources (e.g., sequence-related parameters).

[0058] FIG. 3CA timing diagram is shown corresponding to physical uplink shared channel (PUSCH) transmissions with one or more SRS resources. In some embodiments, PUSCH transmission 319 and PUSCH transmission 321 can be associated with different SRS resources 313 and SRS resources 315 from each other within one SRS resource set 300C. In some embodiments, SRS resources 313 and SRS resources 315 can be used for antenna switching and UL transmissions (e.g., codebook-based UL and / or non-codebook-based UL). Further, there can be a gap 318 between PUSCH transmission 319 and PUSCH transmission 312. In some embodiments, the length (e.g., number of OFDM symbols) of gap 318 is the same as the length of gap 317 between SRS resources 313 and SRS resources 315.

[0059] In further embodiments, UE 101 can average the limited transmission power P SRS over multiple antenna ports configured for SRS transmission. In this way, if at least two SRS resources from two different SRS resource sets collide in antenna port, time, frequency, and / or code domain during at least one SRS transmission occasion, or if at least two SRS resources from two different SRS resource sets are configured to share (or reuse) the same physical resources, the transmission power of each colliding SRS resource can be determined based on the antenna port, SRS resource ID, or time, frequency, or code domain resources specified in the two colliding SRS resources. In one embodiment, the time domain resources can be periodic, aperiodic, or semi-persistent. In some embodiments, if the two SRS resources have the same resource ID, the UE can scale the transmission power P SRS of each colliding (or shared) SRS resource by a factor of S. In other embodiments, if the two colliding (or shared) SRS resources have the same antenna port, the UE can scale the transmission power of each colliding (or shared) SRS resource by a factor of S. In some embodiments, if the two colliding (or shared) SRS resources fully overlap in time domain, frequency domain, and code domain (e.g., fully overlap in resource elements (REs), cyclic shifts, and SRS sequences), the UE can scale the transmission power P SRSIn other embodiments, the transmission power scaling factor S may be equal to 1. In a further embodiment, if, within two conflicting (or shared) SRS resources, a first SRS resource has time, frequency, and code domain resources (e.g., RE, cyclic shift, SRS sequence) that are a subset of the time, frequency, and code domain resources of a second SRS resource, then for the SRS resources in the SRS resource set including the first SRS resource, the UE 101 may scale the transmission power P of each SRS resource in the SRS resource set by a factor s1. SRS , and for the SRS resources in the SRS resource set including the second SRS resource, the transmission power P of each SRS resource in the SRS resource set may be scaled by a factor s2 SRS , where s1 is less than or equal to s2. In some embodiments, if, within two conflicting (or shared) SRS resources, a first SRS resource has antenna ports that are a subset of antenna ports of a second SRS resource, then for SRS resources in an SRS resource set that includes the first SRS resource, UE 101 may scale the transmission power P of the SRS resources in the SRS resource set by a factor s1. SRS , and for the SRS resources in the SRS resource set including the second SRS resource, the transmission power P of the SRS resources in the SRS resource set may be scaled according to a factor s2 SRS , where s1 is less than or equal to s2. In some embodiments, if, within two conflicting (or shared) SRS resources, a first SRS resource has time, frequency, and code domain resources (e.g., RE, cyclic shift, SRS sequence) that are a subset of the time, frequency, and code domain resources of a second SRS resource, then for SRS resources in an SRS resource set including the first SRS resource, the UE 101 may scale the transmission power P of the SRS resources in the SRS resource set by a factor s1. SRS , and for the SRS resources in the SRS resource set including the second SRS resource, the transmission power P of the SRS resources in the SRS resource set may be scaled according to a factor s2 SRS In some embodiments, if, within two conflicting (or shared) SRS resources, a first SRS resource has antenna ports that are a subset of ports of a second SRS resource, then for SRS resources in an SRS resource set that includes the first SRS resource, UE 101 may scale the transmission power P of the SRS resources in the SRS resource set by a factor s1. SRS , and for the SRS resources in the SRS resource set including the second SRS resource, the transmission power P of the SRS resources in the SRS resource set may be scaled according to a factor s2 SRSIn some embodiments, s2 is equal to 1, and s1 may be less than or equal to 1. In other embodiments, the factor may be determined by s1=NP1 / NP2, where NP1 is the number of ports in the first SRS resource and NP2 is the number of ports in the second SRS resource. In addition, UE1 01 may scale the transmission power P of other resources in the SRS resource set by a factor of 1. SRS .

[0060] FIG. 4A to FIG. 4C FIG1 shows a timing diagram of SRS resource allocation according to various embodiments of the present disclosure. In some embodiments of the present disclosure, when UE 101 transmits SRS resources, BS 103 may configure the time domain position. For example, FIG. 4A As shown, BS 103 can configure multiple time domain positions 401 (e.g., indicated by L_1 and L_2 time slots), which indicate the starting positions of the OFDM symbols of the SRS resources within time slot 400A. In various embodiments, the time domain positions can be indicated by time domain time slots, where the time domain time slots can include one or more concurrent resource blocks (RBs). In some embodiments, in a 5G NR wireless communication node, time slot 400A includes a predetermined number N (e.g., N=14) of OFDM symbols. In other embodiments, within time slot 400A, a variable number τ of OFDM symbols can be dedicated to the transmission of SRS, while the remaining N-τ OFDM symbols can be allocated for UL data. In further embodiments, BS 103 can also configure the length (K) of consecutive OFDM symbols used by the SRS resources. In an exemplary embodiment, the SRS resources can occupy 403 (K) OFDM symbols starting from the starting position 401. In some embodiments, the value K can be the number of OFDM symbols in repetition or frequency hopping. Unlike existing solutions that restrict the time domain location of SRS resources, an exemplary advantage of this method is that it enables flexibility in the symbol location of SRS resources. In addition, this method also allows SRS resources to occupy non-contiguous OFDM symbols.

[0061] In some embodiments, BS 103 may configure bitmap 405 to indicate the OFDM symbols that SRS resources occupy in time slot 400B. In various embodiments, the size of the bitmap may be determined by the number of OFDM symbols in time slot 400B. In another example, the size of the bitmap may be determined based on the number of OFDM symbols, the number of frequency hopping, and / or the number of repetitions in time slot 400B. FIG. 4B As shown, each bit 407 / 409 in the bitmap 405 may be associated with a set of repeating symbols or a hop frequency.

[0062] In some embodiments, BS 103 may configure a start symbol 411 and a bitmap 414 to indicate the OFDM symbols occupied by the SRS resource in time slot 400C. The start symbol 411 indicates the first symbol position of the SRS resource in time slot 400C. There may be a total of S symbols from the first symbol 411 to the last symbol of time slot 400C. In some embodiments, the size of the bitmap may be determined by the number of symbols, the number of hops, and / or the number of repetitions. In various embodiments, each bit 413 / 415 in the bitmap may be associated with a set of repeated symbols or a hop, such as FIG. 4C shown.

[0063] In some embodiments, SRS resources can be transmitted in an aperiodic manner. Thus, after receiving a physical downlink control channel (PDCCH) with downlink control information (DCI) that explicitly triggers an SRS resource set, the aperiodic SRS resource transmission by UE 101 can be triggered by BS 103. In particular, BS 103 can configure a trigger slot offset measured in multiple time slots between the time slot in which the DCI trigger is received and the time slot containing the aperiodic SRS resource transmission. In various embodiments, the trigger slot offset can take a value between 0 and 6 time slots, where 0 refers to the same time slot in which UE 101 receives the DCI trigger. In some embodiments, the trigger slot offset can be configured at the SRS resource set level. Therefore, the SRS resources within the SRS resource set can be configured / activated / triggered on a per-set basis.

[0064] In other embodiments of the present disclosure, BS 103 may configure one or more trigger slot offsets for one or more subsets of an SRS resource set. In this embodiment, each trigger slot offset is associated with a subset of an SRS resource set. In this embodiment, the SRS resources within a subset of an SRS resource set may have the same trigger slot offset. In addition, the resources in a subset of an SRS resource set may be transmitted in the same time slot. Unlike the previously described method in which only a single trigger slot offset is allowed for each SRS resource set, an exemplary advantage of this embodiment is that it allows one or more trigger slot offsets for each SRS resource set. This method also enables flexible determination of one or more trigger slot offsets.

[0065] In some embodiments, the UE 101 can determine the number of subsets of the SRS resource set based on the configuration parameters or predetermined rules. In various embodiments, the subsets of the SRS resource set can be formed based on the number of subsets and the order of the SRS resources in the SRS resource set. The order of the SRS resources can be determined based on the SRS resource IDs. In various embodiments, the subsets of the SRS resource set can have an equal number of SRS resources. In other embodiments, a list specifying a bijective (e.g., one-to-one) mapping between the triggering slot offsets and the subsets of the SRS resource set can be configured. In some embodiments, the BS 103 can configure a subset ID for each subset of the SRS resource set. In this embodiment, each subset ID can map to a triggering slot offset.

[0066] In further embodiments, the BS 103 can configure a triggering slot offset for each SRS resource in the SRS resource set. Further, the number of slots configured for transmission of the SRS resources in the SRS resource set can be limited to be no more than a predetermined value M. In other embodiments, the number of slots can be configured by the BS 103. Further, in other example embodiments, the number of slots can be carried in the capability signaling of the UE 101.

[0067] In another embodiment, the maximum time range (M) measured in terms of slots or OFDM symbols for transmission of the SRS resources in the SRS resource set can be determined by the UE 101. In other embodiments, the BS 103 can configure the maximum time range M for transmission of the SRS resources. In this embodiment, the maximum time range M can be defined as the maximum number of OFDM symbols or slots between the earliest and the last SRS resource transmission. In some embodiments, the maximum time range M can be determined based on the difference between the maximum triggering slot offset and the minimum triggering slot offset for the SRS resources in the SRS resource set. Further, the maximum time range M can be configured by the BS 103. Further, the maximum time range M can also be a predetermined value. Further, in other example embodiments, the maximum time range M can be carried in the capability signaling of the UE 101.

[0068] FIG. 5A and FIG. 5B A block diagram of a radio frequency (RF) transceiver chain is shown. As FIG. 5A shown, the UE 101 can include an antenna 503 and a single RF chain with a power amplifier 501. In other embodiments, as FIG. 5BAs shown, UE 101 may include antenna 509 and two parallel RF chains having power amplifier 505 and power amplifier 507. In some embodiments, UE 101 may report its capabilities, including the number of RF chains, to BS 103. In further embodiments, UE 101 may report to BS 103 its ability to share transmission power between antennas configured for one or more purposes. In other embodiments, UE 101 may report whether the maximum transmission power of one SRS resource purpose (e.g., antenna switching) is equal to the maximum transmission power of another SRS resource purpose (e.g., UL transmission). In other embodiments, UE 101 may report the ratio between the maximum transmission power of one SRS resource purpose (e.g., antenna switching) and the maximum transmission power of another SRS resource purpose (e.g., UL transmission). In some embodiments, the ratio may be one of 1 / 4, 1 / 2, 1, 2, and 4.

[0069] In other embodiments, UE 101 may report whether the maximum transmission power of the SRS of the N1 antenna is equal to the maximum transmission power of the SRS of the N2 antenna, where N1 <N2。在其他实施例中,UE 101可以报告实现全部传输功率的SRS传输的最少天线数量。在其他实施例中,UE 101可以报告SRS传输的最大或最小功率缩放值。在其他实施例中,可以从其他控制信号中隐含地传递UE 101的能力。例如,与UL全功率传输相关的控制信号可以用于确定UE 101的能力。在其他实施例中,UE 101可以报告其每个SRS资源用途类型的能力。例如,对于天线切换的用途,每种类型对应于xTyR能力中x和y的一种组合,其中x是传输(Tx)天线的数量,而y是接收(Rx)天线的数量。在其他实施例中,如果每个SRS资源用途支持多种类型,则UE 101可以报告其能力。例如,对于天线切换的用途,如果UE 101在xTyR能力中支持x和y的多个组合或者在所支持的x和y的组合中存在多个x值,则UE 101可以报告其能力。在其他实施例中,如果用于一个用途(例如,天线切换)的天线端口的最大数量不等于用于另一个用途(例如,UL传输)或其SRS的天线端口的最大数量,则UE101可以报告其能力。否则,UE 101可以不报告其能力。

[0070] FIG. 6 is a block diagram of a flow diagram of a method for transmitting one or more sounding reference signal (SRS) resource sets for one or more purposes according to various embodiments of the present disclosure. In some embodiments, FIG. 6The flowchart shown in can be executed by UE 101, for example.

[0071] In block 601, UE 101 may receive one or more configuration parameters from BS 103. In block 603, UE 101 may determine one or more usages of multiple SRS resources in one or more SRS resource sets based on the one or more configuration parameters. In block 605, UE 101 may transmit SRS using the multiple SRS resources configured for the one or more usages.

[0072] FIG. 7 A block diagram illustrating a flow diagram of a method for transmitting an aperiodic sounding reference signal (SRS) according to various embodiments of the present disclosure is shown. In some embodiments, FIG. 7 The flowchart shown in can be executed by UE 101, for example.

[0073] In block 701, UE 101 may receive downlink control information (DCI) from BS 103. In block 703, UE 101 may receive a slot offset for an SRS resource or a subset of SRS resources within an SRS resource set, where the slot offset indicates a time position relative to a reception slot of the downlink control information (DCI) when aperiodic SRS transmission is triggered. In block 705, UE 101 may transmit each SRS resource in the SRS resource set or subset of SRS resources at a time corresponding to the slot offset.

[0074] FIG. 8 A block diagram of a network node (NN) 800 according to various embodiments of the present disclosure is shown. NN 800 is an example of a wireless communication node that can be configured to implement the various methods described herein. In some embodiments, NN 800 can be a wireless communication node, such as a user equipment (UE), as described herein. In other embodiments, NN 800 can be a wireless communication device, such as a base station (BS), as described herein. FIG. 8 As shown, NN 800 includes a housing 840 that houses a system clock 802 , a processor 804 , a memory 806 , a transceiver 810 including a transmitter 812 and a receiver 814 , a power module 808 , and an SRS transmission module 820 .

[0075] In this embodiment, system clock 802 provides timing signals to processor 404 for controlling the timing of all operations of NN 800. Processor 804 controls the overall operation of NN 800, and can include one or more processing circuits or modules, such as a central processing unit (CPU) and / or a general purpose microprocessor, a microcontroller, a digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a controller, a state machine, gated logic, discrete hardware components, and any

[0076] Memory 806, which can include both read-only memory (ROM) and random access memory (RAM), can provide instructions and data to processor 804. A portion of memory 806 can also include non-volatile random access memory (NVRAM). Processor 804 typically performs logical and arithmetic operations based on program instructions stored within memory 806. The instructions (also referred to as software) stored in memory 806 can be executed by processor 804 to perform the methods described herein. Processor 804 and memory 806, together, form a processing system that stores and executes software. As used herein, “software” refers to any type of instructions (which can be referred to as software, firmware, middleware, microcode, etc.) that can be executed by a processor or device to perform one or more desired functions or processes. The instructions can include code (e.g., in source code format, binary code format, executable code format, or any other suitable format of code). The instructions, when executed by one or more processors, cause the processing system to perform the various functions described herein.

[0077] Transceiver 810, including transmitter 812 and receiver 814, allows NN 800 to transmit data to and receive data from external network nodes (e.g., BSs or UEs). Antenna 850 is typically attached to housing 840 and electrically coupled to transceiver 810. In various embodiments, NN 800 includes (not shown) multiple transmitters, multiple receivers, and multiple transceivers. In some embodiments, antenna 850 includes a multiple antenna array that can form multiple beams according to MIMO beamforming techniques, each pointing in a different direction.

[0078] The SRS transmission module 820 can be implemented as a portion of the processor 804 that is programmed to perform the functions described herein, or the SRS transmission module can be a standalone module implemented in hardware, firmware, software, or a combination thereof. According to various embodiments, as described above, the SRS transmission module 820 is configured to transmit periodic / aperiodic sounding reference signals configured for multiple purposes. In some embodiments, the SRS transmission module 820 can be implemented as software (i.e., computer-executable instructions) stored on a non-transitory computer-readable medium that, when executed by the processor 804, converts the processor 804 into a special-purpose computer to perform the nulling operations described herein.

[0079] The various components and modules described above within housing 840 are coupled together via bus system 830. For example, in addition to a data bus, bus system 830 may also include a power bus, a control signal bus, and / or a status signal bus. It should be understood that the modules of NN 800 may be operably coupled to each other using any suitable technology and media. It should also be understood that additional modules (not shown) may be included in NN 800 without departing from the scope of this disclosure.

[0080] Although various embodiments of the present disclosure have been described above, it should be understood that the additional modules are presented by way of example only, not by way of limitation. Similarly, various figures may depict example architectures or configurations, which are provided to enable one of ordinary skill in the art to understand the exemplary features and functions of the present disclosure. However, such persons will understand that the present disclosure is not limited to the example architectures or configurations shown, but may be implemented using various alternative architectures and configurations. Additionally, as one of ordinary skill in the art will understand, one or more features of an embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of the present disclosure should not be limited by any of the exemplary embodiments described above.

[0081] It should also be understood that any reference to an element herein using designations such as "first," "second," etc., does not generally limit the quantity or order of those elements. Rather, these designations are used herein to facilitate distinguishing between two or more elements or instances of an element. Thus, reference to a first element and a second element does not mean that only two elements can be used, or that the first element must precede the second element in some manner.

[0082] Additionally, those skilled in the art will appreciate that information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, and symbols referenced in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0083] Those skilled in the art will further appreciate that any of the various illustrative logical blocks, modules, processors, devices, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementations, analog implementations, or a combination of both), firmware, various forms of program or design code incorporating instructions (which, for convenience, may be referred to herein as "software" or "software modules"), or any combination of these technologies.

[0084] To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been generally described above in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these technologies, depends on the specific application and the design constraints imposed on the overall system. A skilled person may implement the described functionality in various ways for each specific application, but such implementation decisions do not result in a departure from the scope of this disclosure. According to various embodiments, processors, devices, components, circuits, structures, machines, modules, etc. can be configured to perform one or more of the functions described herein. The terms "configured to" or "configured for" as used herein with respect to a particular operation or function refer to a processor, device, component, circuit, structure, machine, module, signal, etc. that is physically constructed, programmed, arranged, and / or formatted to perform a particular operation or function.

[0085] In addition, it will be understood by those of ordinary skill in the art that the various exemplary logic blocks, modules, devices, components, and circuits described herein may be implemented within or performed by an integrated circuit (IC), which may include a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may also include antennas and / or transceivers to communicate with various components within a network or device. A processor programmed to perform the functions herein will become a specially programmed or dedicated processor and may be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other suitable configuration to perform the functions described herein.

[0086] If implemented in software, these functions can be stored as one or more instructions or codes in a computer-readable medium. Therefore, the steps of the method or algorithm disclosed herein can be implemented as software stored in a computer-readable medium. Computer-readable media also include computer storage media and communication media, including any medium that can transfer a computer program or code from one place to another. The storage medium can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0087] As used herein, the term "module" refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for the purpose of discussion, various modules are described as separate modules; however, it is obvious to one of ordinary skill in the art that two or more modules can be combined to form a single module that performs the associated functions according to embodiments of the present disclosure.

[0088] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of this disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. An apparatus for transmitting a set of sounding reference signal (SRS) resources for two or more purposes, comprising: a receiver configured to receive one or more configuration parameters of an SRS resource set from a radio network node; A processor configured to determine, based on the one or more configuration parameters, two or more uses of each SRS resource in the plurality of SRS resources in the one SRS resource set from a plurality of uses, wherein: The multiple uses include antenna switching use, codebook use, non-codebook use and beam management use, Each of the plurality of SRS resources has at least one SRS antenna port, and each of the SRS resources is configured for the two or more purposes, and The two or more usages are configured for the one SRS resource set and applied to each SRS resource in the plurality of SRS resources in the one SRS resource set; as well as A transmitter configured to transmit an SRS using each of the plurality of SRS resources configured for the two or more purposes, the transmitter further configured to transmit capability information indicating a ratio between a first transmission power corresponding to a first group of antenna ports and a second transmission power corresponding to a second group of antenna ports, wherein the ratio is selected from a ratio set {1 / 4, 1 / 2, 1, N2 / N1}, wherein the first group of antenna ports includes N1 antenna ports and the second group of antenna ports includes N2 antenna ports. 2 . The apparatus according to claim 1 , wherein the one or more configuration parameters of the one SRS resource set comprise a bitmap configured to map the multiple usages to the multiple SRS resources.

3. The apparatus according to claim 1, wherein the one or more configuration parameters of the one SRS resource set are selected from "antenna switching", "codebook", "non-codebook", "beam management" and combinations thereof. 4 . The apparatus of claim 1 , wherein the processor is further configured to select a subset of the plurality of SRS resources and configure the selected subset to have two or more uses from the plurality of uses. The apparatus according to claim 1 , wherein the processor is further configured to map the plurality of usages to the plurality of SRS resources based on a predetermined rule. 6 . The apparatus according to claim 5 , wherein the predetermined rule selects a predetermined number of SRS resources from the one SRS resource set, and maps the selected predetermined number of SRS resources to a first usage selected from the plurality of usages. 7 . The apparatus of claim 1 , wherein the processor is further configured to map each of the plurality of usages to a resource ID of the plurality of SRS resources.

8. The apparatus of claim 1, wherein a first number of antenna ports in the first set of antenna ports is different from a second number of antenna ports in the second set of antenna ports.

9. The apparatus of claim 1, wherein the first set of antenna ports is a subset of the second set of antenna ports.

10. The apparatus of claim 1, wherein the first group of antenna ports and the second group of antenna ports are associated with different usages. The apparatus of claim 1 , wherein the ratio is less than or equal to 1.

12. The apparatus of claim 1, wherein the transmitter is further configured to transmit capability information indicating a supported maximum transmission power scaling factor.

13. The apparatus according to claim 1, wherein the processor is further configured to: if at least two SRS resources from a plurality of SRS resources in the one SRS resource set have at least one of common time domain resources, common frequency domain resources, common antenna ports, and common sequence parameters, adjust the transmission power for transmission of each SRS resource in the one SRS resource set according to a predetermined factor, wherein the predetermined factor depends on the characteristics of the plurality of SRS resources, and wherein the at least two SRS resources include a first SRS resource and a second SRS resource.

14. The apparatus according to claim 13, wherein the predetermined factor is equal to 1 when the at least two SRS resources from the plurality of SRS resources have at least one of a common resource ID, a common time domain resource, a common frequency domain resource, a common antenna port, and a common sequence parameter.

15. The apparatus according to claim 13, wherein a first predetermined transmission power factor of the first SRS resource is less than or equal to a second predetermined transmission power factor, and wherein the first predetermined transmission power factor and the second predetermined transmission power factor are less than or equal to 1. 16 . The apparatus of claim 15 , wherein a third predetermined transmission power factor of an SRS resource different from the first SRS resource and the second SRS resource is equal to 1.

17. The apparatus of claim 15, wherein the first predetermined transmission power factor is equal to the ratio of NP1 / NP2, and the second predetermined transmission power factor is equal to 1, and wherein, NP1 is the number of antenna ports in the first SRS resource, and NP2 is the number of antenna ports in the second SRS resource.

18. An apparatus for receiving a sounding reference signal (SRS) from a set of SRS resources configured for two or more purposes, comprising: a transmitter configured to send one or more configuration parameters of an SRS resource set to a user equipment; as well as A receiver configured to receive an SRS from a plurality of SRS resources of the user equipment (UE), wherein each of the plurality of SRS resources has at least one SRS antenna port, and each of the SRS resources is configured to be used for two or more purposes from a plurality of purposes, the plurality of purposes including antenna switching purpose, codebook purpose, non-codebook purpose, and beam management purpose, and wherein the two or more purposes are configured for the one SRS resource set and applied to each of the plurality of SRS resources in the one SRS resource set, the receiver being further configured to receive capability information, the capability information indicating a ratio between a first transmission power corresponding to a first group of antenna ports and a second transmission power corresponding to a second group of antenna ports, wherein the ratio is selected from a ratio set {1 / 4, 1 / 2, 1, N2 / N1}, wherein the first group of antenna ports includes N1 antenna ports and the second group of antenna ports includes N2 antenna ports. 19 . The apparatus according to claim 18 , wherein the one or more configuration parameters of the one SRS resource set comprise a bitmap configured to map the multiple usages to the multiple SRS resources.

20. The apparatus according to claim 18, wherein the one or more configuration parameters of the one SRS resource set are selected from "antenna switching", "codebook", "non-codebook", "beam management" and combinations thereof.

21. The apparatus of claim 18, wherein the ratio is less than or equal to 1.

22. The apparatus of claim 18, wherein the receiver is further configured to receive capability information indicating a supported maximum transmission power scaling factor.

23. A method for transmitting a set of sounding reference signal (SRS) resources for two or more purposes, comprising: receiving one or more configuration parameters of an SRS resource set from a radio network node; Determining two or more usages from a plurality of usages for each of the plurality of SRS resources in the one SRS resource set based on the one or more configuration parameters, wherein: The multiple uses include antenna switching use, codebook use, non-codebook use and beam management use, Each of the plurality of SRS resources has at least one SRS antenna port, and each of the SRS resources is configured for the two or more purposes, and The two or more usages are configured for the one SRS resource set and applied to each SRS resource in the plurality of SRS resources in the one SRS resource set; transmitting an SRS using each of the plurality of SRS resources configured for the two or more purposes; as well as Transmission capability information indicating a ratio between a first transmission power corresponding to a first group of antenna ports and a second transmission power corresponding to a second group of antenna ports, wherein the ratio is selected from a set of ratios {1 / 4, 1 / 2, 1, N2 / N1}, where the first group of antenna ports includes N1 antenna ports and the second group of antenna ports includes N2 antenna ports. 24 . The method according to claim 23 , wherein the one or more configuration parameters of the one SRS resource set include a bitmap configured to map the multiple usages to the multiple SRS resources.

25. The method according to claim 23, wherein the one or more configuration parameters of the one SRS resource set are selected from "antenna switching", "codebook", "non-codebook", "beam management" and combinations thereof.

26. The method of claim 23, further comprising: selecting a subset of the plurality of SRS resources; and The selected subset is configured to have two or more uses from the plurality of uses.

27. The method of claim 23, further comprising: The plurality of usages are mapped to the plurality of SRS resources based on a predetermined rule.

28. The method according to claim 27, wherein the predetermined rule selects a predetermined number of SRS resources from the one SRS resource set, and maps the selected predetermined number of SRS resources to a first usage selected from the plurality of usages.

29. The method of claim 23, further comprising: Each of the plurality of usages is mapped to a resource ID of the plurality of SRS resources.

30. The method of claim 23, wherein a first number of antenna ports in the first set of antenna ports is different from a second number of antenna ports in the second set of antenna ports.

31. The method of claim 23, wherein the first set of antenna ports is a subset of the second set of antenna ports.

32. The method of claim 23, wherein the first group of antenna ports and the second group of antenna ports are associated with different uses.

33. The method of claim 23, wherein the ratio is less than or equal to 1.

34. The method of claim 23, further comprising: Transmit capability information indicating the maximum supported transmit power scaling factors.

35. The method of claim 23, further comprising: If at least two SRS resources from the multiple SRS resources in the one SRS resource set have at least one of common time domain resources, common frequency domain resources, common antenna ports and common sequence parameters, the transmission power used for the transmission of each SRS resource in the one SRS resource set is adjusted according to a predetermined factor, wherein the predetermined factor depends on the characteristics of the multiple SRS resources, and wherein the at least two SRS resources include a first SRS resource and a second SRS resource.

36. The method of claim 35, wherein the predetermined factor is equal to 1 when at least two SRS resources from the plurality of SRS resources have at least one of a common resource ID, a common time domain resource, a common frequency domain resource, a common antenna port, and a common sequence parameter.

37. The method of claim 35, wherein a first predetermined transmission power factor of the first SRS resource is less than or equal to a second predetermined transmission power factor, and wherein the first predetermined transmission power factor and the second predetermined transmission power factor are less than or equal to 1.

38. The method of claim 37, wherein a third predetermined transmission power factor of an SRS resource different from the first SRS resource and the second SRS resource is equal to 1.

39. The method of claim 37, wherein the first predetermined transmission power factor is equal to a ratio of NP1 / NP2, and the second predetermined transmission power factor is equal to 1, and wherein NP1 is the number of antenna ports in the first SRS resource and NP2 is the number of antenna ports in the second SRS resource.

40. A method for receiving a set of sounding reference signal (SRS) resources configured for two or more purposes, comprising: Transmitting one or more configuration parameters of an SRS resource set to a user equipment; receiving an SRS from a plurality of SRS resources of the user equipment (UE), wherein each of the plurality of SRS resources has at least one SRS antenna port, and each of the SRS resources is configured for two or more purposes from a plurality of purposes, the plurality of purposes including an antenna switching purpose, a codebook purpose, a non-codebook purpose, and a beam management purpose, and wherein the two or more purposes are configured for the one SRS resource set and applied to each of the plurality of SRS resources in the one SRS resource set; as well as Receiving capability information, the capability information indicating a ratio between a first transmission power corresponding to a first group of antenna ports and a second transmission power corresponding to a second group of antenna ports, wherein the ratio is selected from a set of ratios {1 / 4, 1 / 2, 1, N2 / N1}, where the first group of antenna ports includes N1 antenna ports and the second group of antenna ports includes N2 antenna ports.

41. The method of claim 40, wherein the one or more configuration parameters of the one SRS resource set comprise a bitmap configured to map multiple usages to the multiple SRS resources.

42. The method according to claim 40, wherein the one or more configuration parameters of the one SRS resource set are selected from "antenna switching", "codebook", "non-codebook", "beam management" and combinations thereof.

43. The method of claim 40, wherein the ratio is less than or equal to 1.

44. The method of claim 40, further comprising: Capability information indicating supported maximum transmit power scaling factors is received.

45. A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed, perform the method according to any one of claims 23 to 44.

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