Transmitting time division multiplexing-based multi-port sounding reference signals in multiple symbols

Abstract

Systems, apparatus, devices, and methods, including computer programs encoded on a storage medium, are provided relating to transmitting a time division multiplexing, TDM, multi-port sounding reference signal, SRS, in a plurality of symbols. A method of wireless communication includes receiving, from a network entity (NE), a time division multiplexed (TDM) multi-port sounding reference signal (SRS) resource configuration and a guide for SRS transmission in a plurality of symbols, the SRS resource configuration and the guide based on capabilities of the UE and supported configuration of the UE regarding the TDM multi-port SRS transmission. The UE may perform at least one of adjusting an SRS transmission power level or preparing a TDM multi-port SRS transmission in a plurality of symbols according to an SRS resource configuration and a guide. The UE transmits TDM multi-port SRS transmissions in multiple symbols to the NE in accordance with the prepared or both at the adjusted SRS transmission power level.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications, and more particularly to sounding reference signals (SRS). Background Art

[0002] The Third Generation Partnership Project (3GPP) has specified a radio interface known as fifth-generation (5G) New Radio (NR) (5G NR). The architecture of a 5G NR wireless communication system includes the 5G Core (5GC) network, the 5G Radio Access Network (5G-RAN), and user equipment (UE). Compared to previous generation cellular communication systems, the 5G NR architecture seeks to provide increased data rates, reduced latency, and / or increased capacity.

[0003] A sounding reference signal (SRS) transmitted by a user equipment (UE) allows a network entity (such as a base station) to perform uplink (UL) channel quality estimation (e.g., before selecting a channel as a physical uplink shared channel (PUSCH)). The network entity may specify or configure SRS resources (e.g., in the time and frequency domains) that may be used by the UE to transmit the SRS. For example, the network entity may configure the SRS resources by specifying: (1) the number of antenna ports, (2) the number of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols), (3) a starting position in the time domain, and (4) a starting position in the frequency domain.

[0004] In general, an antenna port represents the channel through which a symbol on the antenna port is transmitted (e.g., a channel whose quality is to be estimated) and can be inferred from the channel through which another symbol on the same antenna port is transmitted. Different antenna ports can be mapped to different physical antennas, or to different beams generated by the same set of physical antennas. According to various aspects of the present disclosure, multi-port SRS transmission refers to the use of multiple antenna ports by a UE to send SRS. The number of antenna ports can be provided by a higher-layer parameter (e.g., nrofSRS-Ports) (if configured), or can be a default value. Multi-port SRS can be sent in multiple symbols.

[0005] When a UE transmits a multi-port SRS in multiple symbols, the UE may use different cyclic shifts and / or different comb offsets (and other different parameters) to generate these SRSs. For example, when the base station configures the comb offset and cyclic shift for the first antenna port of the SRS resource, the UE then determines another different comb offset and / or cyclic shift for the other antenna ports based on the comb offset and cyclic shift of the first antenna port. As the number of antenna ports increases, the UE may not be able to transmit all multi-port SRSs in one symbol. Therefore, the UE may use different antenna port sets in different symbols to transmit the multi-port SRS, thereby failing to achieve full power. Summary of the Invention

[0006] The following presents a simplified overview of one or more aspects in order to provide a basic understanding of such aspects. This overview is not an extensive review of all contemplated aspects. This overview neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be presented later.

[0007] Methods, systems, and techniques for transmitting (and configuring to transmit) a time division multiplexing (TDM) based multi-port ("multi-port") sounding reference signal (SRS). As mentioned above, when a UE transmits an SRS from multiple antenna ports in one symbol, the UE may use different cyclic shifts and / or different comb offsets (and other different parameters) for the multiple antenna ports. For example, when a base station configures the comb offset and cyclic shift for a first antenna port of an SRS resource, the UE then determines the comb offset and / or cyclic shift for the other antenna ports based on the first antenna port configuration. As the number of multiple antenna ports increases, the UE may not be able to transmit an SRS from multiple antenna ports in one symbol. Therefore, the UE may use different antenna port sets to transmit the SRS on multiple symbols, but not use full power transmission in these antenna ports, thereby reducing performance and efficiency.

[0008] Aspects of the present disclosure include a method for wireless communication performed by a user equipment (UE). The method includes receiving, from a network entity (NE), an SRS resource configuration and guidance for time-division multiplexed (TDM) multi-port sounding reference signal (SRS) transmission in a plurality of symbols, the SRS resource configuration and the guidance being based on the UE's capabilities and supported configurations for TDM multi-port SRS transmission. The UE may, based on the SRS resource configuration and the guidance, at least one of: adjusting an SRS transmission power level or preparing a TDM multi-port SRS transmission in the plurality of symbols. The UE transmits the TDM multi-port SRS transmission to the NE in the plurality of symbols at the adjusted SRS transmission power level, as prepared, or both.

[0009] Aspects of the present disclosure include a wireless communication method performed by a network entity (NE). The method includes generating a guide based on supported configured capabilities of a user equipment (UE) for time division multiplexing (TDM) multi-port SRS transmission over a plurality of symbols. The method includes sending an SRS resource configuration for TDM multi-port sounding reference signal (SRS) transmission in the plurality of symbols and a guide for TDM multi-port SRS transmission to the UE. The method includes receiving TDM multi-port SRS transmission from the UE in the plurality of symbols based on the guide. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A diagram illustrating a wireless communication system including a plurality of user equipments (UEs) and network entities communicating through one or more cells.

[0011] Figure 2 An example of TDM-based multi-port SRS transmission according to aspects of the present disclosure is illustrated.

[0012] Figure 3 An example of TDM-based multi-port SRS transmission when rapid power changes may occur according to aspects of the present disclosure is illustrated.

[0013] Figure 4 An example of TDM-based multi-port SRS transmission when SRS overlaps with other uplink signals and transmission power levels are updated according to aspects of the present disclosure is illustrated.

[0014] Figure 5 An example signaling diagram illustrating full-power multi-port SRS transmission between a user equipment (UE) and a network entity as determined by the UE according to aspects of the present disclosure.

[0015] Figure 6 Example signaling diagram between a UE and a network entity for full-power multi-port SRS transmission as indicated by the network entity in accordance with aspects of the present disclosure.

[0016] Figure 7 is a flow chart of a method of wireless communication by a UE for full-power multi-port SRS transmission according to aspects of the present disclosure.

[0017] Figure 8 is a flow chart of a method of wireless communication for full-power multi-port SRS transmission by a network entity according to aspects of the present disclosure.

[0018] Figure 9 An example signaling diagram illustrating multi-port SRS transmission between a UE and a network entity when the UE determines resources for each symbol of the SRS according to aspects of the present disclosure is shown.

[0019] Figure 10 An example signaling diagram illustrating multi-port SRS transmission between a UE and a network entity when resources for each symbol of the SRS are indicated by the network entity according to aspects of the present disclosure.

[0020] Figure 11 is a flow chart of a method of wireless communication for multi-port SRS transmission by a UE according to aspects of the present disclosure.

[0021] Figure 12is a flow chart of a method of wireless communication for multi-port SRS transmission by a network entity according to aspects of the present disclosure.

[0022] Figure 13 An example of multi-port SRS transmission with repetition priority based operation according to aspects of the present disclosure is illustrated.

[0023] Figure 14 An example of multi-port SRS transmission with multiplexing priority-based operation according to aspects of the present disclosure is illustrated.

[0024] Figure 15 An example signaling diagram illustrating between a UE and a network entity for multi-port SRS transmission overlapping with a second uplink signal according to aspects of the present disclosure.

[0025] Figure 16 is a flow chart of a method of wireless communication by a UE for multi-port SRS transmission overlapping with a second uplink signal according to aspects of the present disclosure.

[0026] Figure 17 is a flow chart of a method of wireless communication by a network entity for multi-port SRS transmission overlapping with a second uplink signal according to aspects of the present disclosure.

[0027] Figure 18 An example of per-symbol power scaling when a multi-port SRS transmission overlaps with a second uplink signal is illustrated in accordance with aspects of the present disclosure.

[0028] Figure 19 An example of power scaling per symbol group when a multi-port SRS transmission overlaps with a second uplink signal is illustrated in accordance with aspects of the present disclosure.

[0029] Figure 20 An example of per-resource power scaling when a multi-port SRS transmission overlaps with a second uplink signal is illustrated in accordance with aspects of the present disclosure.

[0030] Figure 21 An example of per-symbol signal dropping when a multi-port SRS transmission overlaps with a second uplink signal is illustrated according to aspects of the present disclosure.

[0031] Figure 22 An example of signal dropping per symbol group when a multi-port SRS transmission overlaps with a second uplink signal according to aspects of the present disclosure is illustrated.

[0032] Figure 23 An example of per-resource signal dropping when a multi-port SRS transmission overlaps with a second uplink signal is illustrated according to aspects of the present disclosure.

[0033] Figure 24 is a flow chart of a method of wireless communication at a UE according to aspects of the present disclosure.

[0034] Figure 25 is a flow chart of a method of wireless communication at a network entity according to aspects of the present disclosure.

[0035] Figure 26 is a diagram illustrating a hardware implementation of an example UE device according to aspects of the present disclosure.

[0036] Figure 27 is a diagram illustrating a hardware implementation of one or more example network entities according to aspects of the present disclosure.

[0037] Like numbers refer to like elements. DETAILED DESCRIPTION

[0038] The present disclosure provides methods, systems, and techniques for transmitting (and configuring to transmit) a time division multiplexing (TDM)-based multi-port ("multi-port") sounding reference signal (SRS). The sounding reference signal (SRS) transmitted by a user equipment (UE) allows a network entity (such as a base station) to perform uplink (UL) channel quality estimation (e.g., before selecting a channel as a physical uplink shared channel (PUSCH)). The network entity can configure different uses of the SRS with the UE, such as SRS for codebook (CB)-based transmission (SRS for CB), SRS for non-codebook (NCB)-based transmission (SRS for NCB), SRS for beam management (BM), and SRS for antenna switching (AS).

[0039] For example, a network entity may configure the usage of an SRS resource set via a radio resource control (RRC) parameter usage. A network entity may specify or configure SRS resources (e.g., in the time domain and the frequency domain) that may be used by a UE to transmit an SRS. For example, a network entity may configure SRS resources by specifying: (1) the number of antenna ports, (2) the number of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols), (3) a starting position in the time domain, and (4) a starting position in the frequency domain. According to the 3GPP standard, the technical specifications specify sequence generation and resource mapping for SRS, uplink control for SRS, procedures for SRS transmission, and a full power transmission mode for uplink transmission.

[0040] When the UE is configured to transmit multi-port SRS in one symbol, the UE may not be able to achieve full power transmission (e.g., as defined in 3GPP TS 38.213, Section 7.3, Version 17.3.0), depending on the power amplification architecture of the UE. When the UE is configured to transmit multi-port SRS from only a portion of the multiple antenna ports, the UE may not be able to transmit the SRS at the maximum transmission power. Traditionally, the UE needs to split the linear transmission power based on the number of configured antenna ports. For example, for an uplink transmission state of eight-port SRS in two symbols for a power class 3 UE with a maximum transmission power of 23 dBm, the current specification only supports 14 dBm across eight ports in any one symbol. That is, the UE splits the linear transmission power based on the number of configured SRS ports for the SRS resources. The reduced transmission power can result in a higher signal-to-noise ratio during operation and have a negative impact on the detection process. Aspects of the present disclosure overcome such issues by enabling full power transmission (or otherwise adjusting to maximize transmission power) of TDM-based multi-port SRS in multiple symbols for different types of UEs in various situations.

[0041] When a UE needs to update its transmission power (e.g., for transmitting an SRS), it may require time or symbol intervals for the UE to actually make the change. That is, it may be impractical for the UE to change its transmission power every two consecutive symbols. The present disclosure addresses this issue by supporting flexible configuration of various SRS parameters (e.g., comb offset, cyclic shift, etc.) for each symbol.

[0042] In some cases, the UE is configured to transmit the multi-port SRS and another uplink signal (e.g., physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH)) simultaneously on one or more common symbols (referred to as overlapping / overlapped transmission). The UE may need to adjust (e.g., scale or drop) the respective transmission powers of the multi-port SRS and the other uplink signal in view of the maximum transmission power.

[0043] By using full-power transmission of multi-port SRS and allowing flexible configuration and / or power adjustment, the UE helps improve overall system performance (e.g., reducing random errors caused by noise, reducing the complexity of rapid power updates, etc.). For example, full-power transmission increases the coverage of SRS. Various aspects of flexible control signaling for fast power updates and multiplexing with other SRS for each SRS symbol can reduce the implementation complexity of the UE. This reduces UE power consumption. Flexible multi-port SRS control can also increase SRS capacity, utilization, or both. Uplink transmission power selection or scaling for partially overlapping situations (where the UE determines the corresponding transmission power for non-overlapping SRS symbols and overlapping symbols) can allow the UE to scale or discard associated signals (e.g., overlapping and / or unnecessary signals) to reduce overhead and UE power consumption.

[0044] When the UE sends SRS from multiple antenna ports in one symbol, the UE may use different cyclic shifts and / or different comb offsets (and other different parameters) for the multiple antenna ports. The UE sends one SRS resource in one symbol. The UE may send the SRS from multiple antenna ports, for example, the UE uses all multiple antenna ports with different cyclic shifts and / or different comb offsets for transmission in one symbol. The network typically configures the comb offset and cyclic shift for the first antenna port of the SRS resource, and the UE may determine the comb offset and cyclic shift based on the comb offset and cyclic shift configured for the first antenna port. In one example, the network may send RRC signaling / message to configure the comb offset and cyclic shift for the first antenna port of the SRS resource. The network may use the following example to configure the comb offset by combOffset and the cyclic shift by cyclicShift. Example:

[0045] When a UE is configured to transmit a multi-port SRS in one symbol, the UE may not be able to achieve full power transmission (e.g., as defined in 3GPP TS 38.101-1, Section 6.2.1, Version 17.7.0), depending on the power amplification architecture of the UE. When a UE is configured to transmit a multi-port SRS from only a portion of the multiple antenna ports, the UE may not be able to transmit the SRS at the maximum transmission power. Traditionally, the UE needs to split the linear transmission power based on the number of configured antenna ports. For example, for an uplink transmission state of eight-port SRS in two symbols for a power class 3 UE with a maximum transmission power of 23 dBm, the current specification only supports 14 dBm across eight ports in any one symbol. That is, the UE splits the linear transmission power based on the number of configured SRS ports for the SRS resource. The reduced transmission power can result in a higher signal-to-noise ratio during operation and have a negative impact on the detection process.

[0046] Aspects of the present disclosure overcome such problems (and provide advantages) by enabling full-power transmission (or otherwise adjusting to maximize transmission power) of TDM-based multi-port SRS in multiple symbols for different types of UEs in various situations, including determining which SRS resources can use the full power level or the maximum allowable power level. By using full-power transmission of multi-port SRS and allowing flexible configuration and / or power adjustment, the UE helps improve overall system performance (e.g., reducing random errors caused by noise, reducing the complexity of rapid power updates, etc.).

[0047] For example, the higher the transmission power (e.g., "full," the highest power the UE can deliver), the greater the coverage of the SRS. Various aspects of flexible control signaling for fast power updates and multiplexing with other SRSs for each SRS symbol can reduce the implementation complexity of the UE. This reduces UE power consumption. Flexible multi-port SRS power control can also increase SRS capacity, utilization, or both. Uplink transmission power selection or scaling for partially overlapping signals (where the UE determines the corresponding transmission power for non-overlapping SRS symbols and overlapping symbols) can allow the UE to scale or discard associated signals (e.g., overlapping and / or unnecessary signals) to reduce overhead and UE power consumption. Details of implementing the disclosed technology are discussed below.

[0048] Figure 1Diagram 100 illustrates a wireless communication system associated with multiple cells 190. The wireless communication system includes a user equipment (UE) 102 and a base station / network entity 104. Some base stations may include a converged base station architecture, while other base stations may include a disaggregated base station architecture. The converged base station architecture includes a radio unit (RU) 106, a distributed unit (DU) 108, and a centralized unit (CU) 110 configured to utilize a radio protocol stack physically or logically integrated within a single radio access network (RAN) node. The disaggregated base station architecture utilizes a protocol stack physically or logically distributed across two or more units (e.g., RU 106, DU 108, CU 110). For example, CU 110 may be implemented within a RAN node, and one or more DUs 108 may be co-located with CU 110, or alternatively, may be geographically or virtually distributed across one or more other RAN nodes. DU 108 may be implemented to communicate with one or more RUs 106. Each of the RU 106, DU 108, and CU 110 may be implemented as a virtual unit, such as a virtual radio unit (VRU), a virtual distributed unit (VDU), or a virtual central unit (VCU). The base station / network entity 104 (e.g., a converged base station, or a disaggregated unit of a base station, such as the RU 106, DU 108, or CU 110) may be referred to as a transmit-receive point (TRP).

[0049] The operation and / or network design of the base station 104 (an example of a network entity 104, interchangeable herein) can be based on the aggregated nature of base station functionality. For example, a disaggregated base station architecture is utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN) network, or a virtualized radio access network (vRAN) (which may also be referred to as a cloud radio access network (C-RAN)). Disaggregation can include distributing functionality across two or more units at various physical locations, as well as distributing functionality virtually for at least one unit, which can enable flexibility in network design. Various units of the disaggregated base station architecture or disaggregated RAN architecture can be configured for wired or wireless communication with at least one other unit. For example, the RUs 106a-106d can communicate with respective UEs 102a-102d and 102s via one or more radio frequency (RF) access links based on a Uu interface. In an example, multiple RUs 106 and / or base stations 104 may concurrently serve UEs 102, such as UE 102a of cell 190a concurrently served by RU 106a of cell 190a and access links of base station 104c of cell 190e.

[0050] RU 106, DU 108, and CU 110 may include (or may be coupled to) one or more interfaces configured to send or receive information / signals via a wired or wireless transmission medium. Base station 104 or any of the one or more decomposed base station units may be configured to communicate with one or more other base stations 104 or one or more other decomposed base station units via a wired or wireless transmission medium. In an example, a processor, memory, and / or controller associated with executable instructions for the interface may be configured to provide communication between base stations 104 and / or one or more decomposed base station units via a wired or wireless transmission medium. For example, a wired interface may be configured to send or receive information / signals via a wired transmission medium, such as via a fronthaul link 160 between RU 106d and a baseband unit (BBU) 112 of base station 104d associated with cell 190d. The BBU 112 includes the DU 108 and the CU 110, which may also be configured with a wired interface (e.g., a midhaul link) between the DU 108 and the CU 110 to transmit or receive information / signals between the DU 108d and the CU 110d. In a further example, a wireless interface, which may include a receiver, transmitter, or transceiver (such as an RF transceiver), is configured to transmit and / or receive information / signals via a wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the base station 104e of the cell 190e via cross-cell communication beams 136-138.

[0051] The RU 106 may be configured to implement lower layer functionality. For example, the RU 106 is controlled by the DU 108 and may correspond to a logical node that hosts RF processing functions or lower layer PHY functionality, such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc. The functionality of the RU 106 may be based on a functional split, such as a lower layer functional split.

[0052] RU 106 can send or receive over-the-air (OTA) communications with one or more UEs 102. For example, RU 106b of cell 190b communicates with UE 102b via a first communication beam set 132 of RU 106b and a second communication beam set 134b of UE 102b of cell 190b, which can correspond to inter-cell communication beams or, in some examples, cross-cell communication beams. For example, UE 102b of cell 190b can communicate with RU 106a via a third communication beam set 134a of UE 102b and a fourth communication beam set 136 of RU 106a of cell 190a. Both real-time and non-real-time features of control plane and user plane communications of RU 106 can be controlled by associated DU 108.

[0053] Any combination of RU 106, DU 108, and CU 110, or any reference thereto individually, may correspond to base station 104. Thus, base station 104 may include at least one of RU 106, DU 108, or CU 110. Base station 104 provides UE 102 with access to the core network. Base station 104 may relay communications between UE 102 and the core network. Base station 104 may be associated with a macro cell of a high-power cellular base station and / or a small cell of a low-power cellular base station. For example, cell 190e may correspond to a macro cell, while cells 190a-190d may correspond to small cells. Small cells include femto cells, pico cells, micro cells, and the like. A cell structure including at least one macro cell and at least one small cell may be referred to as a "heterogeneous network."

[0054] Transmissions from a UE 102 to a base station 104 / RU 106 are referred to as uplink (UL) transmissions, while transmissions from a base station 104 / RU 106 to a UE 102 are referred to as downlink (DL) transmissions. Uplink transmissions may also be referred to as reverse link transmissions, and downlink transmissions may also be referred to as forward link transmissions. For example, RU 106 d utilizes antenna 114 of base station 104 d in cell 190 d to transmit downlink / forward link communications to or receive uplink / reverse link communications from UE 102 d over a Uu interface associated with an access link between UE 102 d and base station 104 d / RU 106 d.

[0055] The communication link between the UE 102 and the base station 104 / RU 106 can be based on multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link can be associated with one or more carriers. The UE 102 and the base station 104 / RU 106 can utilize a spectrum bandwidth of Y MHz (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, 800 MHz, 1600 MHz, 2000 MHz, etc.) per carrier, allocated in a carrier aggregation of up to a total of Yx MHz, with x component carriers (CCs) used for communication in each of the uplink and downlink directions. The carriers may or may not be adjacent to each other along the spectrum. In an example, uplink and downlink carriers may be allocated in an asymmetric manner, with more or fewer carriers allocated for the uplink or downlink. The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be associated with a primary cell (PCell), and the secondary component carrier may be associated with a secondary cell (SCell).

[0056] Some UEs 102 (such as UE 102a and UE 102s) can perform device-to-device (D2D) communication via a sidelink. For example, the sidelink communication / D2D link utilizes the spectrum of a wireless wide area network (WWAN) associated with uplink and downlink communications. The sidelink communication / D2D link can also use one or more sidelink channels such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and / or a physical sidelink control channel (PSCCH) to transmit information between UEs 102a and 102s. Such sidelink / D2D communication can be performed via various wireless communication systems, such as wireless fidelity (Wi-Fi) systems, Bluetooth systems, long term evolution (LTE) systems, new radio (NR) systems, and the like.

[0057] The electromagnetic spectrum is typically subdivided into different categories, bands, channels, etc., based on the different frequencies / wavelengths associated with the electromagnetic spectrum. Fifth-generation (5G) NR is typically associated with two operating frequency ranges (FR), referred to as Frequency Range 1 (FR1) and Frequency Range 2 (FR2). FR1 ranges from 410 MHz to 7.125 GHz, and FR2 ranges from 24.25 GHz to 71.0 GHz, including FR2-1 (24.25 GHz to 52.6 GHz) and FR2-2 (52.6 GHz to 71.0 GHz). Although a portion of FR1 is actually greater than 6 GHz, FR1 is often referred to as the "sub-6 GHz" band. In contrast, FR2 is often referred to as the "millimeter wave" (mmW) band. FR2 is distinct from the "extremely high frequency" (EHF) band, but is a close subset of it. The EHF band ranges from 30 GHz to 300 GHz and is sometimes also referred to as the "millimeter wave" band. Frequencies between FR1 and FR2 are often referred to as "mid-band" frequencies. The operating band for mid-band frequencies may be referred to as Frequency Range 3 (FR3), which ranges from 7.125 GHz to 24.25 GHz. Frequency bands within FR3 may include characteristics of FR1 and / or FR2. Thus, the features of FR1 and / or FR2 may be extended to mid-band frequencies. Higher operating bands have been identified to extend 5G NR communications above the 52.6 GHz associated with the upper limit of FR2. Three of these higher operating bands include FR2-2 (ranging from 52.6 GHz to 71.0 GHz), FR4 (ranging from 71.0 GHz to 114.25 GHz), and FR5 (ranging from 114.25 GHz to 300 GHz). The upper limit of FR5 corresponds to the upper limit of the EHF band. Therefore, unless otherwise specified herein, the term "sub-6 GHz" may refer to frequencies less than 6 GHz, frequencies within FR1, or may include mid-band frequencies. Further, unless otherwise expressly stated herein, the term "millimeter wave" or mmW refers to frequencies that may include mid-band frequencies, frequencies that may be within FR2-1, FR4, FR2-2, and / or FR5, or frequencies that may be within the EHF band.

[0058] UE 102 and base station 104 / RU 106 may each include multiple antennas. The multiple antennas may correspond to antenna elements, antenna panels, and / or antenna arrays that may facilitate beamforming operations. For example, RU 106b may transmit downlink beamformed signals to UE 102b based on a first communication beam set 132 in one or more transmit directions of RU 106b. UE 102b may receive downlink beamformed signals from RU 106b in one or more receive directions of UE 102b based on a second communication beam set 134b. In a further example, UE 102b may also transmit uplink beamformed signals to RU 106b based on the second communication beam set 134b in one or more transmit directions of UE 102b. RU 106b may receive uplink beamformed signals from UE 102b in one or more receive directions of RU 106b.

[0059] UE 102b may perform beam training to determine the optimal beam for receiving and transmitting signals from and to the base station. The transmit and receive beams of UE 102 and base station 104 / RU 106 may be different. In a further example, beamformed signals may be communicated between a first base station / RU 104a and a second base station 104e. For example, base station 104e of cell 190e may transmit beamformed signals to RU 106a based on communication beam 138 in one or more transmit directions of base station 104e. RU 106a may receive beamformed signals from base station 104e of cell 190e in one or more receive directions of RU 106a based on RU communication beam 136.

[0060] The base station 104 may include and / or be referred to as a network entity. That is, a “network entity” may refer to the base station 104 or at least one unit of the base station 104, such as the RU 106, the DU 108, and / or the CU 110. The base station 104 may also include and / or be referred to as a next generation evolved Node B (ng-eNB), a first generation NB (gNB), an evolved NB (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP, a network node, a network device, or other related terms. The base station 104 or an entity at the base station 104 may be implemented as an IAB node, a relay node, a sidelink node, a converged (integrated) base station having the RU 106 and the BBU 112 including the DU 108 and the CU 110, or as a decomposed base station including one or more RUs 106, DUs 108, and / or CUs 110. A converged or disaggregated set of base stations may be referred to as a next generation radio access network (NG-RAN). In some examples, UE 102a operates in dual connectivity (DC) with base station 104e and base station / RU 106a. In such a case, base station 104e may be the primary node and base station / RU 160a may be the secondary node.

[0061] The uplink / downlink signals may be communicated via a satellite positioning system (SPS) 114. In one example, the SPS 114 of cell 190c may communicate with one or more UEs 102 (such as UE 102c) and one or more base stations 104 / RUs 106 (such as RU 106c). The SPS 114 may correspond to one or more of a global navigation satellite system (GNSS), a global positioning system (GPS), a non-terrestrial network (NTN), or other satellite positioning / location systems. The SPS 114 may be associated with LTE signals, NR signals (e.g., based on round-trip time (RTT) and / or multiple RTTs), wireless local area network (WLAN) signals, a terrestrial beacon system (TBS), sensor-based information, NR enhanced cell ID (NR E-CID) technology, downlink angle of departure (DL-AoD), downlink time difference of arrival (DL-TDOA), uplink time difference of arrival (UL-TDOA), uplink angle of arrival (UL-AoA), and / or other systems, signals, or sensors.

[0062] like Figure 1As shown, the UE 102 may include an SRS management component 140 configured to receive, from the base station 104, an SRS resource configuration and guidance for TDM multi-port SRS transmission in a plurality of symbols, the SRS resource configuration and the guidance being based on the capabilities of the UE 102 and supported configurations of the UE 102 with respect to TDM multi-port SRS transmission. Figure 2 An example of TDM-based multi-port SRS transmission is illustrated in FIG, which illustrates an example of TDM-based multi-port SRS transmission 200 in one resource block (RB), and resource elements (e.g., shaded cells) of multiple antenna ports (also referred to as SRS ports, such as 1000-1003 and 1004-1007) in two symbols (each symbol carries four SRS ports, as shown in the figure).

[0063] The SRS management component 140 of the UE 102 can perform at least one of the following in the plurality of symbols: adjust the SRS transmission power level, or prepare a TDM multi-port SRS transmission based on the SRS resource configuration and guidance from the base station 104. The UE 102 can transmit the TDM multi-port SRS transmission to the base station 104 in the plurality of symbols at the adjusted SRS transmission power level, as prepared, or both.

[0064] In various aspects, the base station 104 or a network entity of the base station 104 may include an SRS configuration component 150 configured to generate a guide based on the supported configured capabilities of the UE 102 for TDM multi-port SRS transmission over a plurality of symbols. The SRS configuration component 150 provides (and the base station 104 sends to the UE 102) an SRS resource configuration for TDM multi-port SRS transmission in a plurality of symbols, as well as the guide for TDM multi-port SRS transmission. The base station 104 then receives the TDM multi-port SRS transmission from the UE 102 based on the guide in a plurality of symbols.

[0065] Thus, according to aspects of the present disclosure, the SRS management component 140 enables the UE 102 to determine the transmission power of each SRS port in each symbol for an SRS resource operating with TDM-based multi-port transmission. This is different from existing practices, according to which the UE 102 can only transmit some SRS ports in one symbol, and the UE 102 may not be able to achieve full power transmission in one symbol.

[0066] For example, UE 102 may report its power level capabilities to base station 102. UE 102 may also report its maximum transmission power. However, when a UE is configured to transmit SRS from only some of the antenna ports, the UE may or may not be able to transmit SRS at maximum transmission power according to known standards. Table 1 illustrates an example of an uplink full-power transmission state for 8-port SRS in 2 symbols at UE power level 3 (maximum transmission power = 23 dBm) with different UE power amplification (PA) architectures, where the UE transmits the first 4 ports in symbol 1 and the remaining 4 ports in symbol 2. Table 1: Examples of uplink full-power transmission states for 8-port SRS in 2 symbols for UE power class 3 (maximum transmission power = 23 dBm) with different UE PA architectures

[0067] According to existing technical specifications, the UE must split the linear transmission power calculated from uplink power control based on the number of SRS ports configured for the SRS resource. However, as shown in Table 1 above, for SRS using TDM-based multi-port transmission, some UEs may be able to transmit SRS at a higher transmission power than the power level generated by linear splitting of the available transmission power. In other words, such UEs may perform poorly under existing technical specifications due to operating at a reduced power level compared to the power level they are capable of.

[0068] The present disclosure overcomes such limitations by supporting full power transmission in different types of UEs, so that capable UEs can operate at full power levels or maximum power levels. In some cases, a UE class corresponds to a maximum power level (e.g., an allowed level) specified by a standard or specification. In some cases, a UE may have a hardware configuration that produces a full power level that is consistent with or different from (e.g., higher or lower than) the maximum power level. In the present disclosure, "maximum power level" refers to a specified or allowed power level, and "full power level" refers to the highest power level output achievable by a UE.

[0069] UE 102 may need a time gap (or time period) to update the SRS transmission power level across multiple symbols. That is, under existing standards, UE 102 is generally restricted from changing the transmission power level immediately or quickly. For example, Figure 3An example of TDM-based multi-port SRS transmission 300 is illustrated when rapid power changes may occur: when the power level of SRS ports 1000-1003 is different from the power level of SRS ports 1004-1007, the UE may not be able to perform rapid transmission power changes on two symbols that are close to each other (according to existing or conventional practices). The present disclosure provides methods and techniques to support power level changes in TDM-based multi-port SRS transmission (ignoring time gaps when applicable). In some cases, the disclosed methods can use flexible configuration of comb offsets and / or cyclic shifts for each symbol to create orthogonal SRS symbols.

[0070] In addition, the base station 104 can configure the UE 102 to transmit the multi-port SRS simultaneously with some other uplink signals (e.g., physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), etc.) in partially overlapping symbols in the serving cell or in different serving cells, such as Figure 4 As illustrated, the figure illustrates an example of TDM-based multi-port SRS transmission 400 when SRS overlaps with other uplink signals and the transmission power level is updated. Figure 4 As shown, the UE needs to transmit another uplink signal on SRS ports 1004-1007 that overlaps with the SRS by one symbol. Consequently, UE 102 may need to update / change the transmission power used for the SRS or the overlapping uplink signal. In some cases, as a special case of the transmission power update, UE 102 may drop one signal. The present disclosure provides methods and techniques for transmitting an SRS using TDM-based multi-port operation when the SRS overlaps with another uplink signal in the serving cell or in a different serving cell.

[0071] therefore, Figure 1 A wireless communication system is described that can incorporate various aspects of one or more of the other figures described herein (such as Figures 5 to 27 As discussed in further detail below, the present disclosure provides examples of uplink full-power transmission for some SRS antenna ports, flexible control signaling for fast power updates and multiplexing with other SRSs for each SRS symbol, and uplink transmission power selection or scaling for partial overlap. Thus, the disclosed method can achieve advantageous operation and improve upon existing practices.

[0072] For example, utilizing SRS transmitted at full power increases SRS coverage, resulting in improved system performance (e.g., signal strength relative to noise). Flexible control signaling for fast power updates and multiplexing with other SRS symbols for each SRS symbol also reduces UE implementation complexity, thereby reducing power consumption. Flexible control signaling can also increase SRS capacity (e.g., improve the amount and / or signal strength of transmissions). Uplink transmission power selection or scaling for partially overlapping uplink transmissions enables the UE to determine the corresponding transmission power for non-overlapping SRS symbols and overlapping symbols. In some cases, the UE can discard unnecessary signals to reduce overhead and UE power consumption.

[0073] Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas such as 5G-Advanced and future releases, LTE, LTE-Advanced (LTE-A), and other wireless technologies (such as 6G).

[0074] Figure 5 5 is an example signaling diagram 500 illustrating signals exchanged by UE 102 and network entity 104 so that the UE can transmit a multi-port SRS using the UE's full available power. As shown, UE 102 reports 520 its UE capability for full-power transmission of SRS using TDM-based multi-port transmission. For example, UE 102 informs network entity 104 whether UE 102 supports full-power uplink transmission of SRS resources using TDM-based multi-port transmission. In some cases, UE 102 may also report 520 the supported configurations (e.g., the (maximum) number of ports per symbol) and whether UE 102 supports uplink full-power transmission.

[0075] In some implementations, it is optional for the UE to transmit a capability report. The network entity 104 may receive information about one or more capabilities from a core network (e.g., an access and mobility management function (AMF)). In yet other implementations, the network entity 104 receives the one or more capabilities from another base station (e.g., a gNB or an eNB). Based on the one or more capabilities, the network entity 104 may use first control signaling to configure at least one SRS resource in an SRS resource set to utilize TDM multi-port transmission and / or full power transmission. For example, the network entity 104 sends 522 first control signaling that configures the at least one SRS resource or SRS resource set to be transmitted using full power transmission based on TDM multi-ports. The first control signaling may be part of a radio resource control (RRC) message (e.g., RRCReconfiguration).

[0076] In some implementations, the network entity 104 may send 524 second control signaling to activate or trigger use / monitoring of at least one SRS resource or SRS resource set. For example, for semi-persistent SRS, the network entity 104 may send a medium access control (MAC) control element (CE) as the second control signaling. For aperiodic SRS, the network entity 104 may send downlink control information (DCI) as the second control signaling.

[0077] The UE 102 determines 526 the transmit power for each antenna port based on the received configuration for full-power transmission from the first control signaling. For example, the UE 102 determines the power level for each antenna port and each symbol based on the power amplification architecture, power class, and other capability information so as to use the maximum achievable power level; when the UE 102 is capable of transmitting using full power, the UE avoids limiting or reducing the power level per port, the power level per symbol, or both for multi-port SRS transmission.

[0078] The UE 102 transmits 528 at least one SRS resource or a set of SRS resources based on the determined transmission power for each antenna port. The network entity 104 receives 530 at least one SRS resource or a set of SRS resources.

[0079] Figure 6 An example signaling diagram 600 is illustrated for full power multi-port SRS transmission between UE 102 and network entity 104 as indicated by network entity 104 according to aspects of the present disclosure. As illustrated in diagram 600, Figure 5 One difference is that, Figure 6 After sending 652 the first control signaling, the base station 104 sends 654 a full-power-related configuration in a second control signaling. In response, the UE 102 determines 626 the transmission power per antenna port of at least one SRS resource or resource set using TDM-based multi-port and full-power transmission. The UE 102 then transmits 628 the at least one SRS resource or SRS resource set based on the determined transmission power per antenna port. The base station 104 receives 630 the at least one SRS resource or SRS resource set.

[0080] The first control signaling 520 in both diagrams 500 and 600 may be part of an RRC message (e.g., an RRC reconfiguration message) or a system information block (SIB). The SIB may be an existing SIB (e.g., SIB1) or a new SIB (e.g., SIB J, where J is an integer greater than 21) sent by the network entity 104.

[0081] Figure 7is a flow chart of a method 700 of wireless communication for full-power multi-port SRS transmission performed by a UE, the method being Figure 5 and Figure 6 500 and 600 correspond to each other. As shown, the UE optionally sends 720 to the network entity information regarding the UE's capabilities for full-power transmission of SRS using TDM-based multi-port transmission. The UE then receives 722 first control signaling that configures an SRS resource or SRS resource set to be used for TDM-based multi-port transmission. The first control signaling may optionally indicate full-power transmission for the SRS resource or resource set.

[0082] The UE then optionally receives 724 second control signaling that triggers an SRS resource or resource set. The second control signaling may optionally indicate full power transmission for the SRS resource or resource set. The UE determines 726 a transmit power for each antenna port of the SRS resource or resource set based on the received first control signaling and / or second control signaling. The UE transmits 728 a multi-port SRS based on the determined transmit power for each antenna port.

[0083] Figure 8 8 is a flow chart of a method 800 for wireless communication for full-power multi-port SRS transmission, performed by a network entity, in accordance with aspects of the present disclosure. The network entity 104 may perform the method 800, which is complementary to the method 700 performed by the UE 102. As shown, the network entity 104 optionally receives 820 information regarding UE capabilities for full-power transmission of SRS using TDM-based multi-port transmission. The network entity 104 sends 822 first control signaling that configures SRS resources or SRS resource sets to be used for TDM-based multi-port transmission. The first control signaling may optionally indicate full-power transmission for the configured SRS resources or resource sets.

[0084] The network entity 104 optionally sends 824 second control signaling for triggering the UE to use the SRS resource or resource set. The second control signaling optionally indicates full power transmission for the SRS resource or resource set. The network entity 104 receives 830 the SRS resource or resource set from the UE 102.

[0085] With reference to both methods 700 and 800, in one embodiment, the UE capability indicates whether the UE 102 is capable of transmitting an SRS using TDM transmission at full power or at a supported maximum power scaling factor. For example, the UE 102 may transmit 720 an ability to support N antenna ports (e.g., N=8) of SRS using TDM-based transmission and to support transmitting such SRS at full power in each symbol. In some cases, the UE 102 may report the UE capability per (e.g., per) feature set, per band, per band combination, or per UE (e.g., applicable to this UE 102 regardless of the feature set, band, or band combination).

[0086] In one embodiment, the UE 102 sends 720 UE capabilities indicating whether the UE is capable of transmitting SRS at full power or a supported maximum power scaling factor for each configuration of TDM-based multi-port (e.g., multiple antenna ports per symbol) transmission. For example, the UE 102 may send three parameters or a 3-bit bitmap indicating full power transmission capabilities for the case of TDM multiplexing based on {1, 2, 4} antenna ports per symbol. The UE may send 720 a capability to support N-port (e.g., N=8) SRS with TDM-based transmission, as well as full power-related capabilities for each usage (e.g., codebook, beam management, or antenna switching) or across usages. Similar to the above, the UE 102 may report such UE capabilities per feature set, per band, per band combination, and / or per UE.

[0087] In one embodiment, the UE 102 transmits 720 UE capabilities indicating whether the UE is capable of transmitting SRS at full power or a supported maximum power scaling factor for each symbol according to each configuration of TDM-based multi-port transmission (e.g., a full power state for each configuration of the number of antenna ports per symbol). For example, when the UE 102 supports 8-port SRS operating with TDM, the UE 102 may transmit three parameters or parameter sets indicating full power transmission capability for the case of TDM multiplexing based on {1, 2, 4} ports per symbol.

[0088] In a first parameter or parameter set, the UE 102 may send an 8-bit bitmap indicating a full power state for each symbol with one port per symbol over eight symbols. In a second parameter or parameter set, the UE 102 may send a 4-bit bitmap indicating a full power state for each symbol with two ports per symbol over four symbols. In a third parameter or parameter set, the UE 102 may send a 2-bit bitmap indicating a full power state for each symbol with four ports per symbol over two symbols.

[0089] The UE 102 may transmit its capability to support N-port (e.g., N=8) SRS with TDM-based transmission, as well as full power-related capabilities for each usage (e.g., codebook, beam management, antenna switching) or across usages. The UE 102 may report UE capabilities by feature set, by band, by band combination, and / or by UE.

[0090] In one embodiment, the UE 102 receives an indication of a full power transmission port or port combination. For example, the UE 102 sends 720 UE capabilities, which indicates whether the UE 102 is capable of transmitting SRS at full power or a supported maximum power scaling factor for a port or port combination or port combination group (e.g., full power state of some SRS ports). Since PUSCH and SRS share the same port index, the UE 102 can report the UE capabilities for the PUSCH port. For example, when the UE 102 supports transmitting 8-port SRS, the UE 102 can send N parameters indicating the full power transmission state of N SRS port combination groups. The SRS port combination group can be predefined to include at least one of the following port combinations: Group 1: Any port combination including port {1000} Group 2: Any port combination including port {1001} Group 3: Any port combination including port {1002} Group 4: Any port combination including port {1003} Group 5: Any port combination including port {1004} Group 6: Any port combination including port {1005} Group 7: Any port combination including port {1006} Group 8: Any port combination including port {1007} Group 9: Any port combination including ports {1000, 1001} Group 10: Any port combination including ports {1002, 1003} Group 11: Any port combination including ports {1004, 1005} Group 12: Any port combination including ports {1006, 1007} Group 13: Any port combination including ports {1000, 1001, 1002, 1003} Group 14: Any port combination including ports {1004, 1005, 1006, 1007}

[0091] When one or more of the above groups include at least one port with the same number, the UE 102 can use one of the groups to determine the full power transmission state. For example, the group with the largest group index among the one or more groups can be used. In some cases, the UE 102 can send the ability to support N ports (e.g., N=8) SRS using TDM-based transmission, as well as full power-related capabilities for each use (e.g., codebook, beam management, or antenna switching) or across uses. The UE can report UE capabilities by feature set, by frequency band, by frequency band combination, and / or by UE.

[0092] In an embodiment, the UE 102 transmits 720 a UE capability for an SRS / PUSCH full power transmission mode capability report. For example, the UE 102 transmits 720 a UE capability indicating the UE capability of supported uplink full power transmission mode for PUSCH and SRS for each number of configured SRS ports (e.g., 2, 4, 8 ports).

[0093] In some implementations, for uplink full power transmission for PUSCH associated with different numbers of indicated SRS ports (e.g., 2, 4, 8 ports), the UE 102 may report supported uplink full power modes, such as mode 0 (PUSCH transmission configured with the RRC parameter ul-FullPwrMode), mode 1 (PUSCH transmission configured with the RRC parameter ul-FullPwrMode1), and mode 2 (PUSCH transmission configured with the RRC parameters ul-FullPwrMode2-SRSConfig-diffNumSRSPorts and / or ul-FullPwrMode2-TPMIGroup). The UE 102 may report the same supported uplink full power mode or different supported uplink full power modes for different numbers of indicated SRS ports (e.g., 2, 4, 8 ports).

[0094] The uplink full power mode 0 for X SRS / PUSCH ports indicates that UE 102 is capable of supporting full power transmission for any port of the SRS resource configured with X ports or for the PUSCH associated with the SRS resource configured with X ports. The uplink full power mode 1 for X SRS / PUSCH ports indicates that the UE is only capable of supporting full power transmission when the UE transmits non-zero power (NZP) uplink signals from all X ports of the SRS resource configured with X ports or from the PUSCH associated with the SRS resource configured with X ports. The uplink full power mode 2 for X SRS / PUSCH ports indicates that the UE is capable of supporting full power transmission when the UE transmits non-zero power (NZP) uplink signals from a subset of Y (Y < X) ports of the SRS resource configured with X ports or from all X ports or from the PUSCH associated with the SRS resource configured with X ports, where the UE may report the set of at least Y ports based on the supported full power precoder (e.g., ul-FullPwrMode2-TPMIGroup).

[0095] When network entity 104 sends the first control signaling of 722 or 822 to UE 102, network entity 104 may use radio resource control (RRC), media access control (MAC) control element (CE), or downlink control information (DCI).

[0096] When network entity 104 configures the SRS resource or resource set using RRC signaling (e.g., RRCReconfiguration), the RRC signaling may configure the uplink full power transmission indication for the SRS symbols or for the SRS resource or SRS resource set (where the SRS resource may include one or more symbols). In some implementations, network entity 104 may configure an indicator to enable or disable uplink full power. In some implementations, network entity 104 may configure the power scaling factor for each antenna port. The range of the scaling factor is determined based on the number X of ports per SRS resource and the number Y of ports per symbol, and the scaling factor may be in the range of [1 / X, 1 / Y]. In some implementations, network entity 104 may configure the uplink full power transmission mode (e.g., mode 0, mode 1, or mode 2) for the SRS resource or resource set or for the PUSCH associated with the SRS resource for each number of ports (e.g., 2, 4, 8 ports).

[0097] In one example, the network entity 104 may configure a bitmap in the SRS resource that indicates whether uplink full power is enabled or disabled for symbols of the SRS resource. A first state in bit x indicates that uplink full power is enabled for symbol x of the SRS resource, and a second state in bit x indicates that uplink full power is disabled for symbol x of the SRS resource. The absence of the bitmap indicates that uplink full power is disabled for each symbol of the SRS resource.

[0098] In another example, the network entity 104 may configure an RRC parameter in the SRS resource indicating whether to enable or disable full uplink power for each symbol of the SRS resource. Alternatively, the network entity 104 may configure an RRC parameter in the SRS resource indicating whether to enable full uplink power for each symbol of the SRS resource. No RRC parameter exists indicating whether to disable full uplink power for each symbol of the SRS resource.

[0099] In another example, the network entity 104 may configure an RRC parameter in the SRS resource set indicating whether to enable or disable full uplink power for each SRS resource in the SRS resource set. Alternatively, the network entity 104 may configure an RRC parameter in the SRS resource set indicating whether to enable full uplink power for each SRS resource in the SRS resource set. No RRC parameter exists indicating that full uplink power is disabled for each SRS resource in the SRS resource set.

[0100] When the network entity 104 uses MAC CE signaling to configure an SRS resource or resource set, the MAC CE configures or indicates an uplink full power transmission indication for the SRS symbol or SRS resource or SRS resource set. In some implementations, the network entity 104 may configure an indicator to enable or disable uplink full power. In some implementations, the network entity 104 may configure a power scaling factor for each antenna port. The range of the scaling factor is determined based on the number X of ports per SRS resource and the number Y of ports per symbol, and the scaling factor may be in the range of [1 / X, 1 / Y]. In some implementations, the network entity 104 may configure an uplink full power transmission mode (e.g., mode 0, mode 1, or mode 2) for the SRS resource or resource set or the PUSCH associated with the SRS resource for each number of ports (e.g., 2, 4, 8 ports).

[0101] In some implementations, the network entity 104 may configure or indicate an uplink full power transmission indication via a MAC CE for activating an SRS resource set (e.g., a semi-persistent SRS resource set). In the MAC CE, the network entity 104 may send a full power transmission indicator or a power scaling factor per SRS symbol, per SRS resource, or per SRS resource set for the activated SRS resource set.

[0102] In some implementations, the network entity 104 may configure or indicate the uplink full power transmission indication via a dedicated MAC CE. In this MAC CE, the network entity 104 may indicate at least one of the following elements: a serving cell index, a bandwidth fraction index, a field indicating SUL or NUL, an SRS resource set index, an SRS resource index, an SRS symbol index, and a full power indicator or a power scaling factor.

[0103] When the network entity 104 uses DCI to configure an SRS resource or resource set, the DCI configures or indicates an uplink full power transmission indication for the SRS symbol or SRS resource or SRS resource. In some implementations, the network entity 104 may configure an indicator to enable or disable uplink full power. In some implementations, the network entity 104 may configure or indicate a power scaling factor for each antenna port. The range of the scaling factor is determined based on the number of ports per SRS resource, X, and the number of ports per symbol, Y, and the scaling factor may be in the range of [1 / X, 1 / Y]. In some implementations, the network entity 104 may configure an uplink full power transmission mode (e.g., mode 0, mode 1, or mode 2) for the SRS resource or resource set or the PUSCH associated with the SRS resource for each number of ports (e.g., 2, 4, 8 ports).

[0104] In some implementations, the network entity 104 may configure the uplink full power transmission indication via a DCI for a triggered SRS resource set (e.g., an aperiodic SRS resource set). In the DCI, the network entity 104 may send a full power transmission indicator or a power scaling factor per SRS symbol, per SRS resource, or per SRS resource set for the triggered SRS resource set.

[0105] In some implementations, the network entity 104 may configure the uplink full power transmission indication via dedicated DCI. The gNB may send the DCI based on a cell-specific radio network temporary identifier (C-RNTI) or a dedicated RNTI that is configured by the network entity 104 via RRC signaling or is predefined. In this DCI, the network entity 104 may indicate at least one of the following elements: a serving cell index, a bandwidth fraction index, a field indicating SUL or NUL, an SRS resource set index, an SRS resource index, an SRS symbol index, and a full power indicator or a power scaling factor.

[0106] In one embodiment, the UE 102 may determine 726 the transmit power for the symbol based on uplink power control related parameters configured through RRC signaling and split the determined linear transmit power for each antenna port by a full power scaling factor.

[0107] In some implementations, the UE receives 722 or 724 an indicator enabling full power transmission from the first control signaling or the second control signaling, and then the UE splits the determined transmit power based on the number of ports configured / indicated for the symbol. In one example, if four ports are configured / indicated and full power is enabled, the UE calculates the transmit power for each configured antenna port by splitting the linear transmit power by 1 / 4.

[0108] In some implementations, the UE receives a scaling factor enabling full power transmission from the first control signaling or the second control signaling, and then the UE splits the determined transmit power based on the scaling factor. In one example, if four ports are configured / indicated and the scaling factor is configured as 1 / 4, the UE calculates the transmit power for each configured antenna port by splitting the linear transmit power by 1 / 4.

[0109] In one embodiment, the UE may determine 726 the transmission power for the SRS resources based on uplink power control related parameters configured through RRC signaling, and split the determined linear transmission power for each antenna port by a full power scaling factor.

[0110] In some implementations, the UE receives 722 or 724 an indicator enabling full power transmission from the first control signaling or the second control signaling, and then the UE splits the determined transmit power for the symbols in the SRS resources based on the number of configured / indicated ports for each of the symbols in the SRS resources. The UE then determines the transmit power for each antenna port for the symbols based on the maximum, minimum, or average transmission across the symbols in the SRS resources. In one example, if four ports are configured and full power is enabled for the first symbol but disabled for the second symbol, the UE calculates the transmit power for each configured antenna port for the first symbol by splitting the linear transmit power by 1 / 4, and calculates the transmit power for each configured antenna port for the second symbol by splitting the linear transmit power by 1 / 8. The UE may then select the transmit power for the two symbols based on the minimum transmit power with a power scaling factor of 1 / 8.

[0111] In some implementations, the UE receives 722 or 724 a scaling factor enabling full power transmission from the first control signaling or the second control signaling, and then the UE splits the determined transmit power based on the scaling factor. If the power scaling factor is different for different symbols, the UE determines the transmit power for each antenna port of the symbols based on the maximum, minimum, or average transmission across the symbols in the SRS resources. In one example, if four ports are configured and the scaling factor is configured as 1 / 4 for the first symbol and 1 / 8 for the second symbol, the UE calculates the transmit power for each configured antenna port by splitting the linear transmit power by 1 / 8.

[0112] Figure 9 An example signaling diagram 900 is shown between a UE 102 and a network entity 104 for multi-port SRS transmission when the UE 102 determines resources for each symbol of the SRS in accordance with various aspects of the present disclosure. As shown, the signaling diagram 900 provides flexible configuration for SRS utilizing TDM-based multi-port transmission. For example, the UE 102 reports 920 UE capabilities regarding supported configurations of TDM-based multi-port transmission. In some implementations, the network entity 104 receives one or more capabilities from a core network (e.g., an access and mobility management function (AMF)). In yet other implementations, the network entity 104 receives one or more capabilities from another base station (e.g., a gNB or an eNB).

[0113] Based on one or more capabilities, the network entity 104 may configure at least one SRS resource in an SRS resource set utilizing TDM-based multi-port transmission and resources for each SRS symbol. In some implementations, the network entity 104 transmits 922 first control signaling via RRC signaling (e.g., RRCReconfiguration) to configure parameters indicating resources for each symbol of the at least one SRS resource or SRS resource set. The gNB may transmit 924 second control signaling, such as a MAC CE or DCI, to trigger or activate the configured at least one SRS resource or resource set. The UE may determine 926 resources for each SRS symbol (e.g., how to repeat or multiplex multi-port SRS) based on the parameters received in the first control signaling and transmit the SRS at the determined resources. The UE 102 transmits 928 at least one SRS resource or SRS resource set based on the determined resources. The network entity 104 receives 930 at least the SRS resource or resource set.

[0114] Figure 10 An example signaling diagram 1000 is shown between UE 102 and network entity 104 for multi-port SRS transmission when the network entity indicates the resource for each symbol of the SRS according to various aspects of the present disclosure. Signaling diagram 1000 illustrates another alternative process for flexible configuration of SRS using TDM-based multi-port transmission. Similar to signaling diagram 900, in Figure 10 , the UE 102 optionally sends 1020 information regarding the UE capability for full power transmission of SRS using TDM-based multi-port transmission.

[0115] The difference between signaling diagrams 900 and 1000 is that in signaling diagram 900, the network entity 104 may send 922 a first parameter set in a first control signaling and send 924 a second control signaling, which triggers the SRS resource or resource set; while in signaling diagram 1000, after sending 1052 the first control signaling, in addition to the triggering, the network entity 104 also sends 1054 a second parameter set in a second control signaling (e.g., MAC CE or DCI), which second parameter set is used to indicate the resources for each symbol of the SRS resource.

[0116] The UE 102 determines 1026 resources for each symbol of at least one SRS resource or SRS resource set based on the received parameters (e.g., the first parameter set of the first control signaling and the second parameter set of the second control signaling). The UE 102 transmits 1028 the at least one SRS resource or SRS resource set based on the determined resources. The network entity 104 receives 1030 the at least one SRS resource or SRS resource set.

[0117] Figure 11 1 is a flow chart of a method 1100 for wireless communication for multi-port SRS transmission by a UE according to various aspects of the present disclosure. The method 1100 illustrates the behavior of the UE 102 in SRS transmission based on cyclic shift hopping, which is similar to Figure 10 1000. As shown, UE 102 optionally transmits 1120 UE capabilities regarding supported configurations of SRS with TDM-based multi-port transmission. UE 102 receives 1152 first control signaling that configures at least one SRS resource or SRS resource set with TDM-based multi-port transmission and parameters indicating a first parameter set that indicates a resource to use for each symbol of the SRS resource.

[0118] UE 102 optionally receives 1154 a second control signaling for triggering at least one SRS resource or SRS resource set. The second control signaling may indicate a second parameter set (e.g., Figure 10 , network entity 104 sends 1054 second control signaling. UE 102 determines 1126 resources for each symbol of at least one SRS resource or SRS resource set (e.g., SRS resources in symbols and subcarriers for each antenna port) based on the received parameters. UE 102 sends 1128 an SRS based on the determined resources for each symbol.

[0119] Figure 12 1 is a flow chart of a method 1200 for wireless communication for multi-port SRS transmission by a network entity according to various aspects of the present disclosure. As shown, the method 1200 is complementary to the method 1100 and describes the behavior of the network entity 104 for SRS configuration and reception based on cyclic shift hopping. Figure 10 The network entity 104 optionally receives 1220 UE capabilities regarding supported configurations of SRS using TDM-based multi-port transmission. The network entity 104 sends 1252 first control signaling to configure at least one SRS resource or SRS resource set using TDM-based multi-port transmission. The first control signaling includes (e.g., using a first parameter set) a parameter or value further indicating a resource for each symbol of the SRS resource.

[0120] The network entity 104 optionally sends 1254 second control signaling to trigger at least one SRS resource or set of SRS resources. The second control signaling may indicate a second parameter set indicating a resource for each symbol of the SRS resource. The network entity 104 receives 1230 the SRS based on the UE-determined resource for each symbol. Detailed examples are discussed below with reference to both methods 1100 and 1200.

[0121] In an embodiment related to reporting UE capabilities for flexible configuration, the UE 102 transmits 1120 UE capabilities indicating supported configurations for SRS with TDM-based multi-port transmission, thereby indicating that the UE 102 supports SRS with TDM-based multi-port transmission. In some implementations, the UE transmits 1120 UE capabilities indicating supported configurations for SRS with TDM-based multi-port transmission, such as the number of ports per symbol and the number of symbols.

[0122] For example, the UE 102 may send a UE capability indicating that the UE 102 supports 8-port SRS in two symbols, with four ports per symbol. In some implementations, the UE may further send a UE capability regarding whether the UE 102 supports both repetition and TDM-based multiplexing for SRS resources. The UE 102 may further send a UE capability regarding supported repetition modes (e.g., repetition-first ( Figure 13 The example shown) or TDM-based multiplexing priority ( Figure 14 In some implementations, the UE 102 may further transmit UE capabilities regarding a minimum gap between symbols utilizing different SRS ports for fast power update.

[0123] In embodiments related to the first control signaling and the second control signaling for flexible SRS resource configuration (e.g., upon receiving the UE's capabilities), the network entity 104 may configure repetition, TDM-based multiplexing, or both for the SRS resources. The network entity 104 may further configure a repetition mode, such as repetition-first or TDM-based multiplexing-first. In the repetition-first mode, the UE 102 first repeatedly transmits symbols using the same port, then transmits symbols using other ports. In the TDM-based multiplexing-first mode, the UE 102 first transmits symbols from different ports, then repeatedly transmits such symbols.

[0124] In some implementations, the network entity 104 may configure a port index for each symbol. In some implementations, the network entity 104 may configure the number of ports per symbol, indicating the number of symbols in the multiplexing group and the total number of symbols in the SRS resource. For example, for an 8-port transmission over 2 symbols, the network entity 104 may configure the number of ports per symbol to be four and the number of symbols in the multiplexing group to be two. The network entity 104 may configure R repetitions by setting the total number of symbols in the SRS resource to 2R. In some implementations, the network entity 104 may configure the starting position of each repetition separately, and the symbols in each repetition may be from the same antenna port.

[0125] Figure 13 An example 1300 of a multi-port SRS transmission with repetition-priority-based operation according to various aspects of the present disclosure is illustrated. As shown, the illustrated SRS resource is based on a repetition-priority mode, where eight ports are multiplexed with four repetitions over two symbols. That is, the resource elements for SRS ports 1000-1003 of the SRS resource are repeated four times and then multiplexed with the resource elements for SRS ports 1004-1007.

[0126] Figure 14 Another example 1400 of multiplexing-first operation is illustrated, in which eight ports are multiplexed with four repetitions in two symbols. As shown, the illustrated SRS resources are based on a TDM multiplexing-first mode, such that resource elements of SRS ports 1000-1003 are first multiplexed with resource elements of SRS ports 1004-1007 (e.g., in adjacent symbols) and then repeated four times.

[0127] In some cases, the UE 102 may determine which mode to use based on whether the UE is able to update the power level in two adjacent symbols. For example, when the UE is unable to update the power level in two adjacent symbols, the UE 102 may determine to use a repetition-first mode. In some cases, the network entity 104 indicates to the UE (via parameters in the first control signaling and / or the second control signaling) which mode the UE 102 will use, but allows the UE to determine the transmission power level. For example, when capable under the indicated mode (repetition-first or multiplexing-first), the UE 102 may determine to use full power transmission.

[0128] In one embodiment, the network entity 104 can avoid configuring both repetition and TDM-based multiplexing for SRS resources. The network entity 104 can configure the number of ports per symbol and whether the symbols of the SRS resources are from the same port. If the symbols are from the same port, the UE can transmit the SRS resources based on a repetition pattern; otherwise, the UE 102 can transmit the SRS resources based on TDM-based multi-port transmission.

[0129] In one embodiment, for TDM-based multi-port transmission, the network entity 104 may configure the gap between symbols utilizing different ports of an SRS resource. In some implementations, the network entity 104 may configure an offset between symbols utilizing different ports within an SRS resource or SRS resource set. The offset may be configured in symbol units, e.g., one symbol. In some implementations, the network entity 104 may configure an indicator to enable the offset, where the duration of the offset is predefined per subcarrier spacing or across subcarrier spacings (e.g., one symbol), or based on UE capabilities reported by the UE. In such implementations, the subcarrier spacing involved may be the subcarrier spacing within a bandwidth part (BWP) or component carrier (CC) in which the SRS resource is transmitted. Alternatively, in such implementations, the subcarrier spacing involved may be the subcarrier spacing within one or more BWPs / CCs in a CC list. In some implementations, the network entity 104 may configure a symbol index for each symbol.

[0130] In one embodiment, for TDM-based multi-port transmission, the network entity 104 may separately configure comb offsets and / or cyclic shifts for symbols from different ports. In some implementations, the network entity 104 separately configures separate parameters indicating the comb offsets and / or cyclic shifts for symbols from different ports. In some implementations, the network entity 104 configures a set of parameters indicating the comb offsets and / or cyclic shifts for symbols from a first set of ports, and another set of parameters indicating the comb offsets and / or cyclic shifts for symbols from a second set of ports. In some implementations, the network entity 104 configures a set of parameters indicating the comb offsets and / or cyclic shifts for symbols from the first set of ports, and another set of parameters indicating whether the comb offsets and / or cyclic shifts for symbols from the second set of ports may be the same. If the parameters indicate that different comb offsets and / or cyclic shifts may apply, the comb offsets and / or cyclic shifts may be determined based on the comb offsets and / or cyclic shifts configured for the first set of ports and the port index for the second set of ports.

[0131] In one embodiment, the network entity 104 may send the above parameters via first control signaling. In one embodiment, the network entity 104 may send the above parameters via second control signaling. In one embodiment, the network entity 104 may send some of the above parameters via first control signaling and send the remaining parameters via second control signaling. In one embodiment, some of the above parameters may be predefined.

[0132] Figure 15An example signaling diagram 1500 is shown between a UE 102 and a network entity 104 for a multi-port SRS transmission overlapping with a second uplink signal according to various aspects of the present disclosure. As shown, the signaling diagram 1500 illustrates a process for performing SRS transmission power scaling when the multi-port SRS transmission at least partially overlaps or collides with the second uplink signal. For example, the UE 102 can adapt the power level of both the SRS and the second uplink signal to be transmitted per symbol by changing (e.g., reducing, dropping, or amplifying) the power levels of one or both of the SRS and the second uplink signal.

[0133] like Figure 15 As shown, UE 102 optionally reports 1520 one or more capabilities regarding whether UE 102 supports simultaneous transmission of an SRS and a second uplink signal using TDM-based multi-port transmission. The second uplink signal may include a PUSCH, PUCCH, PRACH, or another SRS resource in fully overlapping symbols or partially overlapping symbols in the same component carrier (CC) or a different CC in a frequency band or frequency band combination. If the sum of the transmission power levels of the SRS resource and the second uplink signal is greater than the maximum or allowable power level of UE 102, the overlap of the two transmissions may result in conflicting requirements. Therefore, UE 102 may need to adjust one or both of the power levels.

[0134] The network entity 104 sends 1522 first control signaling that configures at least one SRS resource or set of SRS resources and a second uplink signal utilizing a TDM-based multi-port. The network entity 104 optionally sends 524 second control signaling that triggers the at least one SRS resource or set of SRS resources. The UE 102 determines 1526 whether the at least one SRS resource or set of SRS resources overlaps with the second uplink signal. If so, the UE 102 may further determine 1526 respective transmission powers for the SRS resource or set of resources and the second uplink signal. For example, the UE 102 may perform power scaling to prevent the sum of the total transmission power from exceeding an upper limit or maximum power level. The UE 102 transmits 1528 the at least one SRS resource or set of SRS resources and / or the second uplink signal based on the determined transmission power. The network entity 104 receives 1530 the at least one SRS resource or set of SRS resources.

[0135] The case of complete overlap or partial overlap may be related to the time domain and / or the frequency domain. In some implementations, the network entity 104 receives one or more capabilities of the UE 102 from the core network (e.g., the access and mobility management function (AMF)). That is, the UE 102 may report the capabilities once, and the relevant network entity may receive the capabilities without receiving the report directly from the UE 102. In still other implementations, the network entity 104 receives one or more capabilities from another base station (e.g., a gNB or an eNB). Based on the one or more capabilities, the network entity 104 may configure at least one SRS resource in at least one SRS resource set and a second uplink signal using TDM-based multi-port transmission.

[0136] The network entity 104 may configure resources for the second uplink signal via RRC signaling, MAC CE, or DCI. The network entity 104 may send second control signaling, such as a MAC CE or DCI, that triggers / activates at least one SRS resource or SRS resource set. The UE 102 may then determine the transmission power for the SRS resource or SRS resource set and the second uplink signal, and transmit the SRS and the second uplink signal based on the determined transmission power.

[0137] In some implementations, the UE 102 may determine zero transmit power for the SRS or the second uplink signal. For example, the UE 102 may drop the SRS or the second uplink signal. In some implementations, the UE 102 may apply non-zero transmit power and / or power scaling to the SRS and / or the second uplink signal to ensure that the total transmit power in the overlapping symbols does not exceed the maximum transmit power.

[0138] Figure 16 is a flow chart of a method 1600 of wireless communication by a UE for multi-port SRS transmission overlapping with a second uplink signal according to aspects of the present disclosure, the method being Figure 15 Corresponding to the signaling diagram 1500. Figure 15 The UE 102 may perform the method 1600. As shown, the UE optionally transmits 1620 a UE capability regarding supported simultaneous transmission of an SRS and other uplink signals using TDM-based multi-port transmission. The UE receives 1622 a first control signaling that configures at least one SRS resource or set of SRS resources and a second uplink signal (such as in a TDM-based multi-port transmission) in one or more common (e.g., partially overlapping) symbols. Figures 18 to 23 (in the example in ).

[0139] The UE optionally receives 1624 second control signaling for triggering at least one SRS resource or resource set. The UE determines 1626 (e.g., by power scaling) corresponding transmission power levels for the SRS resource or SRS resource set and the second uplink signal, such as in combination with Figures 18 to 23 Further discussion. The UE transmits 1628 an SRS or an SRS resource set and / or a second uplink signal based on the scaled transmission power.

[0140] Figure 17 is a flow chart of a method 1700 of wireless communication by a network entity for multi-port SRS transmission overlapping with a second uplink signal in accordance with aspects of the present disclosure. Figure 15 The network entity 104 may perform method 1700, which is complementary to method 1600 performed by UE 102. As shown, the network entity optionally receives 1720 information about UE capabilities regarding supported simultaneous transmission of an SRS and other uplink signals using TDM-based multi-port transmission. The network entity transmits 1722 first control signaling that configures at least one SRS resource or set of SRS resources and a second uplink signal using TDM-based multi-port transmission in one or more common symbols (e.g., partially overlapping symbols).

[0141] The network entity optionally sends 1724 second control signaling to trigger at least one SRS resource or set of SRS resources. The network entity receives 1730 at least one SRS resource or set of SRS resources and / or a second uplink signal based on the power level scaled by the UE. The following example aspects apply to both methods 1600 and 1700.

[0142] In an embodiment related to UE capabilities regarding SRS transmission power scaling, the UE sends 1620 one or more UE capabilities indicating whether the UE supports simultaneous transmission of SRS and a second uplink signal (e.g., PUSCH, PUCCH, PRACH, or SRS for other purposes) utilizing TDM-based multi-port transmission in fully overlapping symbols or partially overlapping symbols in the same component carrier (CC) or different CCs in a frequency band or frequency band combination. The UE may further send 1620 UE capabilities indicating whether the UE supports a common power scaling factor for SRS symbols from different ports. The UE may further send 1620 UE capabilities indicating a supported maximum symbol offset between two SRS symbols from different ports. Based on the UE capabilities, the UE may perform various types of power scaling on the SRS and / or the second uplink signal.

[0143] Figure 18Example 1800 of power scaling by symbol when a multi-port SRS transmission overlaps with a second uplink signal according to various aspects of the present disclosure is illustrated. Example 1800 illustrates an embodiment related to power scaling by symbol. As shown, in overlapping symbols (e.g., the fourth symbol from the left, where both SRS and uplink signals are scheduled for the same symbol), if the transmission power for SRS and the second uplink signal calculated based on the uplink power control parameters may exceed the maximum transmission power in the unscaled case, the UE applies power scaling by symbol. In the illustrated example, the UE reduces the power level of the SRS resource while maintaining the power level of the uplink signal. The total power level can be less than or equal to the maximum transmission power (e.g., based on the UE class and other standard constraints).

[0144] In some implementations, the UE applies power scaling to one of the SRS and the second uplink signal based on priority level. For example, the UE may change the power level of the channel with a lower priority than the other. In some cases, the priority of the channels may be predefined or configured by the gNB via RRC signaling. For example, the following uplink signals are arranged in descending priority level: 1) PRACH transmission on PCell or PSCell, 2) PUCCH or PUSCH transmission with a larger priority index, 3) PUCCH or PUSCH transmissions with the same priority index, 4) PUCCH transmission with HARQ-ACK information, and / or Scheduling Request (SR), and / or Link Recovery Request (LRR), and / or HARQ-ACK information with priority index, and / or Listen Before Talk (LBT) failure, and / or PUSCH transmission of MAC CE for beam failure recovery, 5) PUCCH transmission with CSI or PUSCH transmission with CSI, 6) PUSCH transmission of HARQ-ACK information or CSI without priority index, and for Type-2 random access procedure, PUSCH transmission on PCell, and 7) SRS transmission (where aperiodic SRS has priority over semi-persistent and / or periodic SRS), or PRACH transmission on a serving cell other than the PCell.

[0145] In some implementations, the UE may use only some of the above priority levels to determine which power level to scale. For example, the first six different types of uplink transmission signals may all have a higher priority level than SRS transmission, while the priority levels of the first six types of uplink transmission signals do not follow the above list.

[0146] Figure 19 Example 1900 illustrates power scaling per symbol group when a multi-port SRS transmission overlaps with a second uplink signal according to aspects of the present disclosure. Example 1900 illustrates an embodiment related to power scaling per symbol group. As shown, in a symbol group ( Figure 19 , if the transmission power for the SRS and the second uplink signal calculated based on the uplink power control parameters exceeds the maximum transmission power, the UE applies power scaling.

[0147] like Figure 19 As shown, SRS symbols using different port combinations can be in the same SRS symbol group. That is, the first and second SRS symbols are in the same SRS group; the third and fourth SRS symbols are in the same SRS group. Symbol groups can be defined as SRS transmission opportunities for power control. The UE applies power scaling to lower-priority signals. Channel priorities can be predefined or configured by the gNB via RRC signaling. In one example, priority rules can be defined similarly to the example priority levels described above.

[0148] Figure 20 Example 2000 illustrates per-resource power scaling when a multi-port SRS transmission overlaps a second uplink signal, in accordance with aspects of the present disclosure. Example 2000 illustrates an embodiment related to per-resource power scaling for SRS. As shown, for an SRS resource that occupies the first four symbols and overlaps with a second uplink signal in at least one symbol, the UE applies power scaling to all four symbols of the SRS resource. The SRS resource may be defined as an SRS transmission opportunity for power control. The UE applies power scaling to lower-priority signals. Channel priorities may be predefined or configured by the gNB via RRC signaling. In one example, the UE may use priority rules similar to those defined above.

[0149] In some cases, the UE can determine or change the transmission power per resource set (across multiple symbols). For example, for an SRS resource set that includes at least one overlapping symbol, if the transmission power of the SRS resource set and the second uplink signal calculated based on the uplink power control parameters exceeds the maximum transmission power, the UE applies power scaling. The SRS resource set can be defined as an SRS transmission opportunity for power control. The UE applies power scaling for lower priority signals. The priority of the channel can be predefined or configured by the gNB through RRC signaling. In one example, the UE can use priority rules similar to those defined above.

[0150] In the above example implementations (e.g., power scaling by symbol, power scaling by symbol group, power scaling by resource, and power scaling by resource set), the network entity may configure / indicate to the UE different values ​​of the power scaling factor for SRS and / or the second uplink signal having different priorities. The network entity may also configure / indicate to the UE different values ​​of the power scaling factor for different transmission occasions of repetition of the SRS. For example, the value of the power scaling factor may be different for PUCCH transmission with HARQ-ACK information and PUCCH transmission of CSI information. For example, the value of the power scaling factor may be different for a first transmission occasion of an SRS repetition and a second transmission occasion of the SRS repetition.

[0151] Figure 21 An example 2100 illustrates per-symbol signal drop when a multi-port SRS transmission overlaps a second uplink signal, in accordance with various aspects of the present disclosure. As shown, instead of performing power scaling, the UE can decide to drop the SRS or the second uplink signal on the symbols where the overlap occurs. As shown, when the UE detects or determines that the sum of the power levels of the SRS transmission and the second uplink signal exceeds the maximum transmit power, the UE drops the second signal.

[0152] In some implementations, whether to drop the SRS or the second uplink signal can be predefined and determined based on the time-domain behavior of the SRS, the time-domain behavior of the second uplink signal, and the content of the second uplink signal. In one example, if the second uplink signal is a PUCCH and the SRS is a periodic SRS, the SRS can be dropped. In another example, if the second uplink signal is a periodic SRS and the SRS is transmitted via TDM-based multi-port transmission, the periodic SRS can be dropped. In some implementations, whether to drop the SRS or the second uplink signal can be configured by the gNB via RRC signaling. In some implementations, whether to drop the SRS or the second uplink signal can be reported by the UE via UE capabilities.

[0153] Figure 22An example 2200 illustrates per-symbol-group signal dropout when a multi-port SRS transmission overlaps a second uplink signal, in accordance with various aspects of the present disclosure. As shown, when a symbol group utilizing all transmission ports overlaps at least one symbol of the second uplink signal, the UE drops the SRS in that symbol group (reducing its power level to zero) and transmits the complete second signal in all four symbols. In some cases, the UE may instead drop the second uplink signal and transmit the complete SRS.

[0154] In some implementations, whether to discard the SRS or the second uplink signal in the symbol group can be predefined, which can be determined based on the time domain behavior of the overlapping SRS, the time domain behavior of the second uplink signal, and the content of the second uplink signal. In one example, if the second uplink signal is a PUCCH and the overlapping SRS is a periodic SRS, the overlapping SRS can be discarded.

[0155] In another example, if the second uplink signal is a periodic SRS and the overlapping SRS is transmitted via TDM-based multi-port transmission, the periodic SRS may be dropped. In some implementations, whether the SRS or the second uplink signal is dropped may be configured by the gNB via RRC signaling. In some implementations, whether the SRS or the second uplink signal is dropped may be reported by the UE via UE capabilities.

[0156] Figure 23 Example 2300 illustrates per-resource signal drop when a multi-port SRS transmission overlaps with a second uplink signal, in accordance with aspects of the present disclosure. As shown, when an SRS resource shares at least one common symbol with a resource of the second uplink signal, the UE may drop the SRS in the overlapping SRS resource. In some cases, the UE may instead drop the second uplink signal.

[0157] In some implementations, whether to discard the SRS or the second uplink signal can be predefined, which can be determined based on the time domain behavior of the SRS, the time domain behavior of the second uplink signal, and the content of the second uplink signal. In one example, if the second uplink signal is a PUCCH and the SRS is a periodic SRS, the SRS can be discarded.

[0158] In another example, if the second uplink signal is a periodic SRS and the SRS is transmitted via TDM-based multi-port transmission, the periodic SRS may be dropped. In some implementations, whether the SRS or the second uplink signal is dropped may be configured by the gNB via RRC signaling. In some implementations, whether the SRS or the second uplink signal is dropped may be reported by the UE via UE capabilities.

[0159] In some cases, the UE may discard the SRS on a per-resource-set basis. For example, instead of discarding the SRS resource set on a per-resource basis, the UE may discard the SRS resource set or the second uplink signal. In some implementations, whether to discard the SRS resource set or the second uplink signal may be predefined and may be determined based on the time-domain behavior of the SRS resource set, the time-domain behavior of the second uplink signal, and the content of the second uplink signal.

[0160] In one example, if the second uplink signal is a PUCCH and the SRS is a periodic SRS, the SRS resource set containing the SRS may be discarded. In another example, if the second uplink signal is a periodic SRS and the SRS is transmitted via TDM-based multi-port transmission, the periodic SRS may be discarded. In some implementations, whether to discard the SRS resource set or the second uplink signal may be configured by the gNB via RRC signaling. In some implementations, whether to discard the SRS resource set or the second uplink signal may be reported by the UE via UE capabilities.

[0161] In some cases, the network entity may configure the UE regarding whether the UE performs power scaling or discards overlapping symbols of the SRS and the second uplink signal. For example, whether any of the above examples is implemented may be based on the UE's capability of simultaneous transmission of the SRS and the second uplink signal. If the UE is capable of supporting simultaneous transmission of the two signals, one of the above examples regarding power scaling may be predefined, or configured by the network entity through RRC signaling, or reported by the UE via UE capabilities, or determined based on at least one predefined rule; otherwise, one of the above examples regarding signal discard may be predefined, or configured by the network entity through RRC signaling, or reported by the UE via UE capabilities, or determined based on at least one predefined rule.

[0162] In some implementations, the predefined rules for determining the time domain granularity of SRS power scaling or dropping may include at least one of the following rules. According to the first rule, the UE determines the time domain granularity based on whether there is at least one symbol that utilizes the same port as the symbol with power scaling or dropping and does not collide with any other uplink signal in the time domain. In one example, if such a symbol exists, the UE applies symbol-level power scaling or dropping; otherwise, the UE applies symbol group or resource or resource set-level power scaling.

[0163] According to the second rule, the UE determines the time domain granularity based on the time domain behavior of the SRS resource set. In one example, if the SRS resource set is a periodic or semi-persistent SRS, the UE applies resource set-level power scaling or dropping; otherwise, the UE applies symbol / symbol group or resource-level power scaling.

[0164] According to the third rule, the UE determines the time-domain granularity based on the usage of the SRS resource set. In one example, if the SRS resource set is used for beam management, the UE applies symbol-level power scaling or dropping; if the SRS resource set is used for codebook-based transmission, the UE applies symbol group or resource-level power scaling or dropping; if the SRS resource set is used for antenna switching, the UE applies resource set-level power scaling or dropping. In another example, the network entity may avoid configuring TDM-based multi-port SRS for beam management.

[0165] Figure 24 Flowchart illustrating a method 2400 of wireless communication at a UE. Figure 1 and Figure 26 , the method can be performed by UE102, UE device 2602, etc., which may include memory 2626', 2606', 2616 and may correspond to the entire UE 102, or the entire UE device 2602, or components of the UE 102 or UE device 2602 (such as the wireless baseband processor 2626 and / or the application processor 2606).

[0166] exist Figure 24 In the embodiment, the UE optionally transmits 2420 to a network entity (NE) an indication of the UE's capabilities relating to supported configurations of the UE regarding TDM multi-port SRS transmission.

[0167] The UE receives 2422 from the NE an SRS resource configuration and a guideline for TDM multi-port sounding reference signal, SRS, transmission in a plurality of symbols, the SRS resource configuration and the guideline being based on the UE's capabilities regarding TDM multi-port SRS transmission and the UE's supported configurations.

[0168] The UE performs 2426 at least one of the following in the plurality of symbols according to the SRS resource configuration and guidelines: adjusting the SRS transmission power level, or preparing for TDM multi-port SRS transmission.

[0169] The UE transmits 2428 a TDM multi-port SRS transmission to the NE in multiple symbols at the adjusted SRS transmission power level, as prepared, or both.

[0170] Figure 24 Method 2400 is described from the UE side of the wireless communication link, while Figure 25 Method 2500 is described from the network side of the wireless communication link.

[0171] Figure 25 Flowchart 2500 illustrating a method of wireless communication at a network entity. Figure 1 and Figure 27The method may be performed by one or more network entities 104, which may correspond to a base station or a unit of a base station (such as RU 106, DU 1025, CU 110, RU processor 2706, DU processor 2726, CU processor 2746, etc.). One or more network entities 104 may include a memory 2706' / 2726' / 2746', which may correspond to the entirety of one or more network entities 104, or a component of one or more network entities 104 (such as RU processor 2706, DU processor 2726, or CU processor 2746).

[0172] exist Figure 25 , the network entity optionally receives 2520 an indication of capabilities of the UE relating to supported configurations of the UE regarding TDM multi-port SRS transmission to the NE.

[0173] The network entity generates 2521 guidelines based on the capabilities of the UE regarding supported configurations for TDM multi-port SRS transmission over multiple symbols.

[0174] The network entity sends 2522 to the UE an SRS resource configuration for TDM multi-port SRS transmission in a plurality of symbols and a guide for TDM multi-port SRS transmission.

[0175] The network entity receives 2530 a TDM multi-port SRS transmission from the UE based on the guideline in a plurality of symbols. Detailed aspects of methods 2400 and 2500 are discussed below.

[0176] In various aspects, the UE capability indicates one or more of the following: the UE is capable of using full power to send TDM multi-port SRS in multiple symbols; the UE is capable of reducing the SRS transmission power level when the SRS overlaps with a second uplink signal; or the UE supports multiple configurations for sending TDM multi-port SRS.

[0177] In some cases, the capabilities of a UE are specific to an SRS configuration, a symbol of an SRS configuration, a port of a UE, a combination of ports of a UE, or a TDM multi-port SRS transmission. In some cases, the capabilities of a UE are specified by feature set, by frequency band, or by frequency band combination.

[0178] In some cases, the UE may transmit an indication of the UE's capabilities by sending a single capability indication of the number of ports per symbol for full-power transmission. In some cases, the UE may transmit an indication of the UE's capabilities by sending parameters related to the SRS configuration, which parameters include at least the number of available antenna ports and the type or purpose of multi-port SRS transmission. In some cases, the UE may transmit an indication of the UE's capabilities by identifying one or more of the available antenna ports for full-power transmission. In some cases, the UE may transmit an indication of the UE's capabilities by sending the supported number of antenna ports for full-power transmission for the Physical Uplink Shared Channel (PUSCH) and TDM multi-port SRS transmission.

[0179] In various aspects, a UE receives the configuration and guidance by receiving a first control signal including an SRS configuration. The UE may also receive a second control signal that triggers at least one of adjusting the SRS transmission power level or preparing for transmission of a TDM multi-port SRS in a plurality of symbols based on the SRS resource configuration and the guidance. The second control signal may include the guidance.

[0180] In various aspects, the guidance instructs the UE to maximize the operation of the SRS transmission power level. Accordingly, the UE adjusts the SRS transmission power level. In some cases, adjusting the SRS transmission power level includes increasing the SRS transmission power level to the UE's full power level for at least one SRS resource.

[0181] In various aspects, the guidance includes parameters for preparing a TDM multi-port SRS transmission, and the performing includes preparing the transmission according to the parameters. In some cases, the UE generates the SRS using comb offsets and / or cyclic shifts configured per port. The UE may repeat or multiplex the TDM multi-port SRS according to the parameters.

[0182] In some cases, the parameters include one or more of a repetition pattern associated with repetition of SRS resources. The repetition pattern specifies the relationship between repetition of SRS resources and TDM-based multiplexing of multi-port SRS. The parameters may include an indication of whether the UE will use repetition or TDM-based multiplexing to transmit an SRS resource or set of SRS resources for the multi-port SRS.

[0183] The parameters may also include a symbol offset between SRS symbols from different antenna ports of a multi-port SRS, the number of ports per symbol, a symbol index per SRS symbol, a first symbol index of an SRS symbol group having SRS symbols from different ports, a comb offset for each SRS symbol, and a cyclic shift for each SRS symbol.

[0184] In some cases, the first control signal or the second control signal includes a message based on radio resource control (RRC), a message based on a medium access control (MAC) control element (CE), or a message based on downlink control information (DCI). For example, the message based on the MAC CE can activate SRS resources configured in the UE; or include a dedicated MAC CE message separate from the MAC CE message that activates SRS resources configured in the UE. The message based on the DCI can also trigger the SRS resource set configured in the UE; or be a dedicated DCI message separate from the DCI message that triggers the SRS resource set in the UE.

[0185] In some cases, maximizing the SRS transmission power level includes splitting the full power level among antenna ports per symbol. In some cases, maximizing the SRS transmission power level includes splitting the full power level among symbols in the SRS resource based on the number of configured ports for each symbol.

[0186] In various aspects, receiving SRS resource configuration and guidance further includes receiving configuration for SRS resources for SRS repetition or multiplexing. The guidance does not configure selection of SRS repetition or SRS multiplexing. The UE may select an order of SRS repetition or SRS multiplexing.

[0187] In various aspects, the guidance indicates the presence of a simultaneous uplink signal transmission that at least partially overlaps with a TDM multi-port SRS transmission, and the performing includes adjusting the SRS transmission power level. In some cases, adjusting the SRS transmission power level is performed for at least one symbol of the plurality of symbols when a sum of scheduled power levels of the simultaneous uplink signal transmission and the TDM multi-port SRS transmission exceeds a maximum transmit power of the UE.

[0188] In some cases, adjusting the SRS transmission power level includes at least one of: (a) reducing the power level of the simultaneous uplink signal transmission and the SRS transmission power level so that the sum is equal to or less than the maximum transmission power of the UE; (b) reducing the SRS transmission power level so that the sum is equal to or less than the maximum transmission power of the UE; or (c) suppressing TDM multi-port SRS transmission for resources that overlap with the simultaneous uplink signal transmission.

[0189] In some cases, adjusting the SRS transmission power level is performed based on a priority difference between the multi-port SRS transmission and the simultaneous uplink signal transmission. Adjusting the SRS transmission power level is performed for: each symbol or symbol group of the multi-port SRS transmission; or each resource or resource set of the multi-port SRS transmission.

[0190] like Figure 26The described UE device 2602 can perform the method of flowchart 2400. Figure 27 The method of flowchart 2500 may be performed by one or more of the described network entities 104 .

[0191] Figure 26 FIG26 is a diagram illustrating an example of a hardware implementation of a UE device 2602. The UE device 2602 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE device 2602 may include an application processor 2606, which may have on-chip memory 2606′. In an example, the application processor 2606 may be coupled to a secure digital (SD) card 2608 and / or a display 2610. The application processor 2606 may also be coupled to a sensor module 2612, a power supply 2614, an additional memory module 2616, a camera 2618, and / or other related components. For example, the sensor module 2612 may control an atmospheric pressure sensor / altimeter, a motion sensor (such as an inertial management unit (IMU), a gyroscope, an accelerometer), a light detection and ranging (LIDAR) device, a radio-aided detection and ranging (RADAR) device, a sound navigation and ranging (SONAR) device, a magnetometer, an audio device, and / or other technologies for positioning.

[0192] The UE device 2602 may further include a wireless baseband processor 2626, which may be referred to as a modem. The wireless baseband processor 2626 may have on-chip memory 2626′. Along with and similar to the application processor 2606, the wireless baseband processor 2626 may also be coupled to a sensor module 2612, a power supply 2614, an additional memory module 2616, a camera 2618, and / or other related components. The wireless baseband processor 2626 may also be coupled to one or more subscriber identity module (SIM) cards 2620 and / or one or more transceivers 2630 (e.g., wireless RF transceivers).

[0193] Within the one or more transceivers 2630, the UE device 2602 may include a Bluetooth module 2632, a WLAN module 2634, an SPS module 2636 (e.g., a GNSS module), and / or a cellular module 2638. The Bluetooth module 2632, the WLAN module 2634, the SPS module 2636, and the cellular module 2638 may each include an on-chip transceiver (TRX), or in some cases, only a transmitter (TX) or only a receiver (RX). The Bluetooth module 2632, the WLAN module 2634, the SPS module 2636, and the cellular module 2638 may each include a dedicated antenna and / or utilize an antenna 2640 to communicate with one or more other nodes. For example, the UE device 2602 may communicate with another UE 102 (e.g., sidelink communication) and / or with a network entity 104 (e.g., uplink / downlink communication) via the antenna 2640 through the transceiver 2630, where the network entity 104 may correspond to a base station or a unit of a base station (such as a RU 106, a DU 108, or a CU 110).

[0194] The wireless baseband processor 2626 and the application processor 2606 may each include computer-readable media / memory 2626′, 2606′, respectively. The additional memory module 2616 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 2626′, 2606′, 2616 may be non-transitory. The wireless baseband processor 2626 and the application processor 2606 may each be responsible for general processing, including executing software stored on the computer-readable media / memory 2626′, 2606′, 2616. When executed by the wireless baseband processor 2626 / application processor 2606, the software enables the wireless baseband processor 2626 / application processor 2606 to perform the various functions described herein. The computer-readable medium / memory may also be used to store data manipulated by the wireless baseband processor 2626 / application processor 2606 when executing the software. The wireless baseband processor 2626 / application processor 2606 may be a component of the UE 102. The UE device 2602 may be a processor chip (e.g., modem and / or applications) and include only the wireless baseband processor 2626 and / or the application processor 2606. In other examples, the UE device 2602 may be the entire UE 102 and include additional modules of the device 2602.

[0195] As discussed, the SRS management component 140 is configured to receive, from the base station 104, an SRS resource configuration and guidance for TDM multi-port SRS transmission in a plurality of symbols, the SRS resource configuration and the guidance being based on the capabilities of the UE 102 with respect to TDM multi-port SRS transmission and the supported configurations of the UE 102. The SRS management component 140 may be within the application processor 2606 (e.g., at 140a), the wireless baseband processor 2626 (e.g., at 140b), or both the application processor 2606 and the wireless baseband processor 2626. The SRS management components 140a-140b may be one or more hardware components specifically configured to perform the stated processes / algorithms, implemented by one or more processors configured to perform the stated processes / algorithms, stored within a computer-readable medium for implementation by one or more processors, or a combination thereof.

[0196] The UE device 2602 may include various components configured for various functions. In an example, the UE device 2602, and specifically the radio baseband processor 2626 and / or the application processor 2606, includes: a component for transmitting an indication of the UE's capabilities related to the UE's supported configurations for TDM multi-port SRS transmission to a NE; a component for receiving an SRS resource configuration and a guide for time division multiplexed TDM multi-port sounding reference signal (SRS) transmission in a plurality of symbols from a network entity NE (104), the SRS resource configuration and the guide being based on the UE's capabilities for TDM multi-port SRS transmission and the UE's supported configurations; a component for performing, in accordance with the SRS resource configuration and the guide, at least one of the following in the plurality of symbols: adjusting an SRS transmission power level, or preparing a TDM multi-port SRS transmission; and a component for transmitting the TDM multi-port SRS transmission to the NE in the plurality of symbols at the adjusted SRS transmission power level, as prepared, or both. The means may be the SRS management components 140a-140b of the UE device 2602 configured to perform the functions recited by that means.

[0197] Figure 2727 is a diagram illustrating an example of a hardware implementation of one or more network entities 104. The one or more network entities 104 may be a base station, a component of a base station, or may implement base station functionality. The one or more network entities 104 may include or correspond to at least one of the RU 106, the DU 108, or the CU 110. The CU 110 may include a CU processor 2746, which may have on-chip memory 2746'. In some aspects, the CU 110 may further include an additional memory module 2756 and / or a communication interface 2748, both of which may be coupled to the CU processor 2746. The CU 110 may communicate with the DU 108 via a midhaul link 162, such as an F1 interface between the communication interface 2748 of the CU 110 and the communication interface 2728 of the DU 108.

[0198] The DU 108 may include a DU processor 2726, which may have on-chip memory 2726'. In some aspects, the DU 108 may further include an additional memory module 2736 and / or a communication interface 2728, both of which may be coupled to the DU processor 2726. The DU 108 may communicate with the RU 106 via a fronthaul link 160 between the communication interface 2728 of the DU 108 and the communication interface 2708 of the RU 106.

[0199] The RU 106 may include a RU processor 2706, which may have on-chip memory 2706'. In some aspects, the RU 106 may further include an additional memory module 2716, a communication interface 2708, and one or more transceivers 2730, all of which may be coupled to the RU processor 2706. The RU 106 may further include an antenna 2740, which may be coupled to the one or more transceivers 2730, such that the RU 106 may communicate with the UE 102 via the antenna 2740 through the one or more transceivers 2730.

[0200] On-chip memory 2706', 2726', 2746' and additional memory modules 2716, 2736, 2756 can each be considered a computer-readable medium / memory. Each computer-readable medium / memory can be non-transitory. Each of processors 2706, 2726, 2746 is responsible for general processing, including executing software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor 2706, 2726, 2746, causes the processor 2706, 2726, 2746 to perform the various functions described herein. The computer-readable medium / memory can also be used to store data manipulated by the processor 2706, 2726, 2746 when executing the software. In an example, the SRS configuration component 150 can be located at any network entity of the one or more network entities 104, such as at the CU 110; at both the CU 110 and the DU 108; at each of the CU 110, DU 108, and RU 106; at the DU 108; at both the DU 108 and the RU 106; or at the RU 106.

[0201] As discussed, the SRS configuration component 150 is configured to generate guidance based on the capabilities of the UE 102 regarding supported configurations for TDM multi-port SRS transmission over multiple symbols. The SRS configuration component 150 provides (and the base station 104 sends to the UE 102) an SRS resource configuration for TDM multi-port SRS transmission in multiple symbols, as well as guidance for TDM multi-port SRS transmission. The base station 104 then receives the TDM multi-port SRS transmission from the UE 102 based on the guidance over multiple symbols. The SRS configuration component 150 can be within one or more processors of one or more network entities 104, such as the RU processor 2706 (e.g., at 150a), the DU processor 2726 (e.g., at 150b), and / or the CU processor 2746 (e.g., at 150c). The SRS configuration components 150a-150c can be one or more hardware components specifically configured to perform the stated process / algorithm, implemented by one or more processors 2706, 2726, 2746 configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors 2706, 2726, 2746, or a combination thereof.

[0202] The one or more network entities 104 may include various components configured for various functions. In an example, the one or more network entities 104 include: means for receiving an indication of a UE's capabilities regarding supported configurations for TDM multi-port SRS transmission to the network entity 104; means for generating a guide based on the UE's capabilities regarding supported configurations for time division multiplexed TDM multi-port SRS transmission over a plurality of symbols; means for sending an SRS resource configuration for TDM multi-port sounding reference signal (SRS) transmission in a plurality of symbols and the guide for TDM multi-port SRS transmission to the UE; and means for receiving TDM multi-port SRS transmission from the UE in the plurality of symbols based on the guide. The means may be SRS configuration components 150a-150c of the one or more network entities 104 configured to perform the functions recited by the means.

[0203] The specific order or hierarchy of the blocks in the processes and flow charts disclosed herein is illustrative of example methods. Therefore, the specific order or hierarchy of the blocks in the processes and flow charts may be rearranged. Some blocks may also be merged or deleted. Dashed lines may represent optional elements of the diagrams. The accompanying method claims present elements of the blocks in an example order and are not limited to the specific order or hierarchy presented in the claims, processes, and flow charts.

[0204] The detailed description set forth herein, in conjunction with the accompanying drawings, describes various configurations and does not represent the only configuration in which the concepts described herein may be practiced. The detailed description includes specific details to provide a comprehensive explanation of the various concepts. However, these concepts may be practiced without using these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0205] Various aspects of wireless communication systems (such as telecommunication systems) are presented with reference to various devices and methods. These devices and methods are described in the detailed description that follows and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, call flows, systems, algorithms, etc. (collectively, "elements"). These elements can be implemented using electronic hardware, computer software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and design constraints imposed on the overall system.

[0206] Element, or any part of an element or any combination of elements can be implemented as a "processing system" including one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other similar hardware configured to perform various functionalities described throughout this disclosure. One or more processors in a processing system can execute software, which can be referred to as software, firmware, middleware, microcode, hardware description language, or other. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, processes, functions, or any combination thereof.

[0207] If the functionality described herein is implemented in software, the functions may be stored on or encoded as one or more instructions or codes on a computer-readable medium, such as a non-transitory computer-readable storage medium. Computer-readable media include computer storage media and may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of computer-accessible instructions or data structures. The storage medium can be any available medium that is accessible to a computer.

[0208] The various aspects, implementations, and / or use cases described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, the various aspects, implementations, and / or use cases can be generated via integrated chip implementations and other non-module component-based devices such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / procurement devices, medical devices, artificial intelligence (AI)-enabled devices, machine learning (ML)-enabled devices, and the like. The various aspects, implementations, and / or use cases can range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregated, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more of the techniques described herein.

[0209] Devices incorporating aspects and features described herein may also include additional components and features for implementing and practicing the aspects and features claimed and described. For example, the transmission and reception of wireless signals necessarily include many components for analog and digital purposes, such as hardware components, antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc. The techniques described herein can be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., in various configurations.

[0210] The description herein is provided to enable those skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not limited to the aspects described herein, but should be interpreted in view of the full scope of the disclosure consistent with the language of the claims.

[0211] Unless expressly stated, references to singular elements do not mean "one and only one", but rather "one or more". Terms such as "if", "when" and "at" do not imply an immediate temporal relationship or reaction. That is, these phrases, such as "when", do not imply immediate action in response to the occurrence of an action or during the occurrence of an action, but simply mean that if a condition is met, the action will occur, but there is no requirement for a specific or immediate time constraint for the action to occur. The terms "may", "might" and "can" as used in this disclosure generally carry certain meanings. For example, "may" refers to a permissive feature that may or may not occur, "might" refers to a feature that is likely to occur, and "can" refers to an ability (e.g., to be able to). The phrase "for example" generally carries a similar meaning to "may", and therefore, "may" is sometimes excluded from sentences that include "for example" or other similar phrases.

[0212] Unless expressly stated otherwise, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C" or "one or more of A, B, or C" include any combination of A, B, and / or C, such as A and B, A and C, B and C, or A, B, and C, and may include multiple A's, multiple B's, and / or multiple C's, or may include only A's, only B's, or only C's. A set can be interpreted as a set of elements, where the number of elements is one or more.

[0213] Unless otherwise expressly indicated, ordinal terms such as "first" and "second" do not necessarily imply a temporal order, sequence, numerical value, etc., but are used to distinguish different instances of the term or phrase following each ordinal term. Figure numerals as used in the specification and drawings are sometimes cross-referenced between the drawings to indicate identical or similar features. Features that are identical in multiple drawings may be labeled with the same figure numerals in the multiple drawings. Features that are similar but not identical across multiple drawings may be labeled with figure numerals having different leading digits but one or more of the same trailing digits (e.g., 206, 306, 406, etc. may refer to similar features in the drawings). Sometimes, "X" is used to generally indicate multiple variations of a feature. For example, "X06" may generally refer to all reference numbers ending in "06" (e.g., 206, 306, 406, etc.).

[0214] Structural equivalents and functional equivalents of the elements of various aspects described in the entire present disclosure that are known or later learned by those of ordinary skill in the art are expressly incorporated herein by reference and are covered by the claims. The words "module", "mechanism", "element", "device" and the like may not be substitutes for the word "component". Therefore, unless the phrase "component for ..." is used to expressly state a claim element, no claim element shall be interpreted as a means plus function. As used herein, the phrase "based on" should not be interpreted as a reference to a closed set of information, one or more conditions, one or more factors, etc. In other words, unless explicitly stated differently, the phrase "based on A" (wherein "A" may be information, a condition, a factor, etc.) should be interpreted as "at least based on A".

[0215] The following examples are merely illustrative and may be combined with other examples or teachings described herein without limitation.

[0216] Example 1. A device comprising: a processor configured to cause a user equipment (UE):

[0217] receiving first control signaling having at least one sounding reference signal (SRS) resource or an SRS resource set utilizing time domain multiplexing (TDM) based multi-port transmission and a parameter indicating a resource for each symbol utilizing a different antenna port;

[0218] determining a transmit power for each symbol of the at least one SRS resource or set of SRS resources;

[0219] The at least one SRS resource or the at least one SRS resource set is transmitted based on the resource indicated by the received parameter and the determined transmission power.

[0220] Example 2. The apparatus of Example 1, wherein the UE transmits a UE capability indicating at least one of: whether the UE is capable of transmitting an SRS using TDM transmission at full power; and a supported maximum power scaling factor for the SRS.

[0221] Example 3. The apparatus of Example 2, wherein the UE may report the UE capability per UE, or per SRS configuration, or per SRS configuration per symbol.

[0222] Example 4. The apparatus of Example 2, wherein the UE can report the UE capabilities by port combination group.

[0223] Example 5. The apparatus of Example 1, wherein the UE receives first control signaling indicating enabling of full power transmission or a power scaling factor for an SRS symbol or an SRS resource or an SRS resource set.

[0224] Example 6. The apparatus of Example 1, wherein the UE receives second control signaling indicating enabling of full power transmission or a power scaling factor for an SRS symbol or an SRS resource or an SRS resource set.

[0225] Example 7. The apparatus of Example 6, wherein the UE receives the second control signaling through a MAC CE or a DCI.

[0226] Example 8. The apparatus of Example 1, wherein the UE transmits UE capabilities indicating supported configurations for SRS utilizing TDM-based multi-port transmission.

[0227] Example 9. The apparatus of Example 1, wherein the UE receives first control signaling that configures both repetition and TDM-based multiplexing for SRS resources.

[0228] Example 10. The apparatus of Example 9, wherein the UE receives first control signaling, the first control signaling configuring a repetition pattern.

[0229] Example 11. The apparatus of Example 9, wherein the repeating pattern is predefined.

[0230] Example 12. The apparatus of Example 1, wherein the UE receives first control signaling that configures the UE to transmit the SRS based on repetition for an SRS resource or an SRS resource set or based on TDM multiplexing.

[0231] Example 13. A device according to Example 1, wherein the UE receives first control signaling that configures at least one of the following elements: a symbol offset between SRS symbols from different antenna ports; the number of ports per symbol; a symbol index per SRS symbol; a first symbol index of an SRS symbol group having SRS symbols from different ports; a comb offset for each SRS symbol; and a cyclic shift for each SRS symbol.

[0232] Example 14. The apparatus of Example 1, wherein the UE utilizes power scaling to transmit the SRS and / or a second uplink signal that fully overlaps or partially overlaps with the SRS.

[0233] Example 15. The apparatus of Example 14, wherein the UE can transmit the overlapping SRS symbols with power scaling.

[0234] Example 16. The apparatus of Example 14, wherein the UE can utilize power scaling to transmit SRS symbol groups from different ports with at least one of the overlapping symbols.

[0235] Example 17. The apparatus of Example 14, wherein the UE can transmit the SRS resource with at least one of the overlapping symbols using power scaling.

[0236] Example 18. The apparatus of Example 14, wherein the UE can utilize power scaling to transmit the SRS resource set having at least one of the overlapping symbols.

[0237] Example 19. The apparatus of Example 14, wherein the power scaling factor may be 0.

[0238] Example 20. The apparatus of Example 14, wherein the power scaling factor may be non-zero to reduce the transmission power until the total transmission power of the two signals does not exceed the maximum transmission power.

[0239] Example 21. A device according to Example 1, wherein the UE sends a UE capability indicating whether the UE supports simultaneous transmission of an SRS and a second uplink signal using TDM-based multi-port transmission in fully overlapping symbols or partially overlapping symbols in the same component carrier (CC) or different CCs in a frequency band or frequency band combination.

[0240] Example 22. The apparatus of Example 1, wherein the UE receives the first control signaling through RRC signaling.

[0241] Example 23. An apparatus comprising: a processor configured to cause a base station (BS):

[0242] transmitting first control signaling having at least one sounding reference signal (SRS) resource or an SRS resource set utilizing time domain multiplexing (TDM) based multi-port transmission and a parameter indicating a resource for each symbol utilizing a different antenna port;

[0243] The at least one SRS resource or the at least one SRS resource set is received based on the resources indicated by the received parameters.

[0244] Example 24. The apparatus of Example 23, wherein the BS receives UE capabilities, the UE capabilities indicating at least one of: whether the UE is capable of transmitting an SRS using TDM transmission at full power; and a supported maximum power scaling factor for the SRS.

[0245] Example 25. The apparatus of Example 24, wherein the BS may receive the UE capability per UE, or per SRS configuration, or per SRS configuration per symbol.

[0246] Example 26. The apparatus of Example 24, wherein the BS can receive the UE capabilities by port combination group.

[0247] Example 27. The apparatus of Example 23, wherein the BS transmits first control signaling indicating enabling of full power transmission or a power scaling factor for an SRS symbol or an SRS resource or an SRS resource set.

[0248] Example 28. The apparatus of Example 23, wherein the BS transmits second control signaling indicating enabling of full power transmission or a power scaling factor for an SRS symbol or an SRS resource or an SRS resource set.

[0249] Example 29. The apparatus of Example 28, wherein the BS sends the second control signaling through a MAC CE or a DCI.

[0250] Example 30. The apparatus of Example 23, wherein the BS receives UE capabilities indicating supported configurations for SRS utilizing TDM-based multi-port transmission.

[0251] Example 31. The apparatus of Example 23, wherein the BS transmits first control signaling that configures both repetition and TDM-based multiplexing for SRS resources.

[0252] Example 32. The apparatus of Example 31, wherein the BS sends first control signaling, the first control signaling configuring a repetition pattern.

[0253] Example 33. The apparatus of Example 31, wherein the repeating pattern is predefined.

[0254] Example 34. The apparatus of Example 23, wherein the BS transmits first control signaling, the first control signaling configuring the UE to transmit the SRS based on repetition for an SRS resource or an SRS resource set or based on TDM multiplexing.

[0255] Example 35. An apparatus according to Example 23, wherein the BS sends first control signaling, which configures at least one of the following elements: a symbol offset between SRS symbols from different antenna ports; the number of ports per symbol; a symbol index per SRS symbol; a first symbol index of an SRS symbol group having SRS symbols from different ports; a comb offset for each SRS symbol; and a cyclic shift for each SRS symbol.

[0256] Example 36. The apparatus of Example 23, wherein the BS utilizes power scaling to transmit the SRS and / or a second uplink signal that fully overlaps or partially overlaps with the SRS.

[0257] Example 37. The apparatus of Example 36, wherein the BS utilizes power scaling to receive the overlapping SRS symbols.

[0258] Example 38. The apparatus of Example 36, wherein the BS utilizes power scaling to receive SRS symbol groups from different ports with at least one of the overlapping symbols.

[0259] Example 39. The apparatus of Example 36, wherein the BS utilizes power scaling to receive the SRS resource having at least one of the overlapping symbols.

[0260] Example 40. The apparatus of Example 36, wherein the BS utilizes power scaling to receive the SRS resource set having at least one of the overlapping symbols.

[0261] Example 41. The apparatus of Example 36, wherein the power scaling factor may be 0.

[0262] Example 42. The apparatus of Example 36, wherein the power scaling factor may be non-zero, ie, reducing the transmission power until the total transmission power of the two signals does not exceed a maximum transmission power.

[0263] Example 43. An apparatus according to Example 23, wherein the BS receives UE capabilities, which indicate whether the UE supports simultaneous transmission of SRS and a second uplink signal using TDM-based multi-port transmission in fully overlapping symbols or partially overlapping symbols in the same component carrier (CC) or different CCs in a frequency band or frequency band combination.

[0264] Example 44. The apparatus of Example 23, wherein the BS sends the first control signaling through RRC signaling.

[0265] Example 45 is a non-transitory computer-readable medium storing computer-executable code that, when executed by a processor, causes the processor to implement the method of any one of Examples 1 to 44.

Claims

1. A method for wireless communication by a user equipment (UE) (102), the method comprising: receiving, from a network entity NE (104), an SRS resource configuration and a guideline for a time division multiplexed TDM multiport sounding reference signal SRS transmission in a plurality of symbols, the SRS resource configuration and the guideline being based on at least one of a capability of a UE or a configuration supported by the UE for the TDM multiport SRS transmission; Perform at least one of the following in the plurality of symbols according to the SRS resource configuration and the guideline: Adjust the SRS transmission power level, or preparing the TDM multi-port SRS transmission; and The TDM multi-port SRS transmission is transmitted to the NE in the plurality of symbols at the adjusted SRS transmission power level, as prepared, or both.

2. The method of claim 1, further comprising: An indication of the at least one of the capabilities of the UE or the configurations supported by the UE is transmitted to the NE.

3. The method according to any one of claims 1 or 2, wherein the at least one of the capabilities of the UE or the configurations supported by the UE indicates one or more of the following: The UE is capable of using full power to transmit the TDM multi-port SRS in the plurality of symbols; When the SRS overlaps with the second uplink signal, the UE is capable of reducing the SRS transmission power level; or The UE supports multiple configurations for transmitting the TDM multi-port SRS.

4. The method according to any one of claims 1 to 3, wherein the capability of the UE is specific to: Specified SRS configuration, A symbol of SRS configuration, One of the UE's ports, or A specific combination of ports of the UE. 5 . The method according to claim 1 , wherein the capability of the UE is related to a feature set, a frequency band, or a specified frequency band combination.

6. The method of any one of claims 2 to 5, wherein transmitting the indication of the capability of the UE comprises at least one of: sending a single capability indication of the number of ports per symbol used for full power transmission; transmitting parameters related to the SRS configuration, the parameters comprising at least one of a number of available antenna ports and a type or usage of the multi-port SRS transmission; identifying one or more available antenna ports among the available antenna ports for adjusting the power; or The supported number of antenna ports transmitting at full power level for the Physical Uplink Shared Channel (PUSCH) and the TDM multi-port SRS transmission.

7. The method of any one of claims 1 to 6, wherein receiving the SRS configuration and the guide comprises: receiving a first control signal, the first control signal including the SRS configuration, and receiving a second control signal that triggers performing at least one of the following in the plurality of symbols according to the SRS resource configuration and the guideline: Adjust the SRS transmission power level, or In preparation for transmission of the TDM multi-port SRS, the guide is included in the second control signal.

8. The method of any one of claims 1 to 7, wherein the guidance indicates that the adjustment includes maximizing the SRS transmission power level.

9. The method according to any one of claims 1 to 8, wherein adjusting the SRS transmission power level comprises: The SRS transmission power level is increased to a full power level corresponding to the class of the UE for at least one SRS resource.

10. The method of any one of claims 1 to 9, wherein the guideline comprises parameters for preparing the TDM multi-port SRS transmission.

11. The method of claim 10, wherein the preparing comprises: Generate TDM multi-port SRS using per-port configured comb offsets and / or cyclic shifts, and The TDM multi-port SRS is repeated or multiplexed according to the parameters.

12. The method of claim 11, wherein the parameters include one or more of the following: a repetition pattern associated with repetition of SRS resources specified in the SRS configuration, wherein the repetition pattern specifies a relationship between the repetition of the SRS resources and TDM-based multiplexing of the TDM multi-port SRS; an indication of whether the UE will use the repetition or the TDM-based multiplexing specified in the SRS configuration to transmit an SRS resource or an SRS resource set for the multi-port SRS; a symbol offset between SRS symbols from different antenna ports of the TDM multi-port SRS; the number of ports per symbol; The symbol index of each SRS symbol; a first symbol index of an SRS symbol group having SRS symbols from different ports; Comb offset for each SRS symbol; as well as Cyclic shift for each SRS symbol.

13. The method according to any one of claims 7 to 12, wherein receiving the first control signal or receiving the second control signal comprises: decoding a radio resource control (RRC) message included in the first control signal or the second control signal; decoding a media access control MAC control element CE message included in the first control signal or the second control signal; or A downlink control information (DCI) message included in the first control signal or the second control signal is decoded.

14. The method of claim 13, wherein the MAC CE message: (a) activating SRS resources configured in the UE; or (b) is a dedicated MAC CE message separate from the MAC CE message for activating the SRS resources configured in the UE.

15. The method of claim 13, wherein the DCI message: (a) triggering an SRS resource set configured in the UE; or (b) is a dedicated DCI message separate from another DCI message that triggers the SRS resource set in the UE.

16. The method of any one of claims 9 to 15, wherein maximizing the SRS transmission power level comprises: splitting the full power level among the antenna ports per symbol; or The full power level is split among symbols in the SRS resources based on a number of configured ports for each symbol.

17. The method of any one of claims 1 to 16, wherein receiving the SRS resource configuration and the guide further comprises: receiving a configuration of SRS repetition or SRS multiplexing for an SRS resource, wherein the guideline does not configure selection of the SRS repetition or the SRS multiplexing; and The method further includes selecting, by the UE, an order of the SRS repetition or the SRS multiplexing.

18. The method of any one of claims 1 to 17, wherein the guide indicates the presence of simultaneous uplink signal transmissions that at least partially overlap with the TDM multi-port SRS transmission, and the performing comprises adjusting the SRS transmission power level.

19. The method of claim 18, wherein adjusting the SRS transmission power level is performed for at least one symbol of the plurality of symbols if a sum of the scheduled power levels of the simultaneous uplink signal transmission and the TDM multi-port SRS transmission exceeds a maximum transmission power of the UE.

20. The method of claim 19, wherein adjusting the SRS transmission power level comprises at least one of: (a) reducing the power level of the simultaneous uplink signal transmission and the SRS transmission power level so that the sum is equal to or lower than the maximum transmission power of the UE; (b) reducing the SRS transmission power level so that the sum is equal to or lower than the maximum transmission power of the UE; or (c) suppressing the TDM multi-port SRS transmission for resources overlapping with the simultaneous uplink signal transmission.

21. The method of claim 20, wherein adjusting the SRS transmission power level is performed based on priorities of the multi-port SRS transmission and the simultaneous uplink signal transmission.

22. The method of claim 21 , wherein adjusting the SRS transmission power level is performed for: each symbol or group of symbols of the multi-port SRS transmission; or Each resource or resource set of the multi-port SRS transmission.

23. A method for wireless communication performed by a network entity (NE), the method comprising: generating guidance based on capabilities of a user equipment (UE) regarding supported configurations for time division multiplexed (TDM) multi-port SRS transmission over multiple symbols; sending, to the UE, an SRS resource configuration for transmission of the TDM multi-port sounding reference signal (SRS) in a plurality of symbols and a guide for transmission of the TDM multi-port SRS; as well as The TDM multi-port SRS transmission is received from the UE based on the guide in the plurality of symbols.

24. The method of claim 23, further comprising: An indication of capabilities of the UE related to the supported configurations of the UE with respect to the TDM multi-port SRS transmission to the NE is received.

25. The method of claim 24, wherein the capability of the UE indicates one or more of the following: The UE is capable of using full power to transmit the TDM multi-port SRS in the plurality of symbols; When the SRS overlaps with the second uplink signal, the UE is capable of reducing the SRS transmission power level; or The UE supports multiple configurations for sending the TDM multi-port SRS.

26. The method according to any one of claims 24 or 25, wherein the capabilities of the UE are specific to: SRS configuration, a symbol of the SRS configuration, One of the UE's ports, A combination of the ports of the UE, or The SRS transmission.

27. The method of any one of claims 24 to 26, wherein the capabilities of the UE are specified by feature set, by frequency band, or by frequency band combination.

28. The method of any one of claims 24 to 27, wherein receiving the indication of the capabilities of the UE comprises at least one of: receiving a single capability indication of the number of ports per symbol for full power transmission; receiving parameters related to the SRS configuration, the parameters including at least the number of available antenna ports and the type or purpose of the multi-port SRS transmission; receiving an identification of one or more of the available antenna ports for full power transmission; or A supported number of antenna ports for full power transmission for a physical uplink shared channel (PUSCH) and the multi-port SRS transmission is received.

29. The method of any one of claims 23 to 28, wherein sending the SRS configuration and the guide comprises: sending a first control signal, wherein the first control signal includes the SRS configuration, and receiving a second control signal, the second control signal triggering the UE to perform at least one of the following in the plurality of symbols according to the SRS resource configuration and the guide: Adjust the SRS transmission power level, or In preparation for transmission of the TDM multi-port SRS, the guide is included in the second control signal.

30. The method of any one of claims 23 to 29, wherein the guidelines indicate maximizing the SRS transmission power level, and the performing comprises adjusting the SRS transmission power level.

31. The method of claim 30, wherein receiving the TDM multi-port SRS transmission comprises: The multi-port transmission is measured at a power level increased to a full power level of the UE for at least one SRS resource.

32. The method of any of claims 23 to 31, wherein the guidelines comprise parameters for preparing the transmission of the TDM multi-port SRS transmission, and the performing comprises preparing in accordance with the parameters.

33. The method according to any one of claims 29 to 32, wherein sending the first control signal or sending the second control signal comprises: Sending a message based on radio resource control RRC; Sending a message based on the media access control MAC control element CE; or Send a message based on downlink control information DCI.

34. The method of claim 33, wherein the MAC CE-based message: (1) also activating the SRS resources configured in the UE; or (2) It is a dedicated MAC CE message separate from the MAC CE message for activating the SRS resources configured in the UE.

35. The method of claim 33, wherein the DCI-based message: (1) also triggering an SRS resource set configured in the UE; or (2) is a dedicated DCI message separate from the DCI message that triggers the SRS resource set in the UE.

36. The method of any one of claims 23 to 35, wherein sending the SRS resource configuration and the guide further comprises: Sending a configuration for SRS resources for SRS repetition or SRS multiplexing, wherein the guide does not configure selection of the SRS repetition or the SRS multiplexing; and The method further includes selecting, by the UE, an order of the SRS repetition or the SRS multiplexing.

37. The method of any one of claims 23 to 36, wherein the guideline indicates the presence of simultaneous uplink signal transmissions that at least partially overlap with the TDM multi-port SRS transmission, and the performing comprises adjusting the SRS transmission power level.

38. The method of claim 37 , wherein receiving the TDM multi-port SRS transmission comprises measuring the multi-port transmission at a power level that is adjusted for at least one of the plurality of symbols when a sum of scheduled power levels of the simultaneous uplink signal transmission and the TDM multi-port SRS transmission exceeds a maximum transmit power of the UE.

39. The method of claim 38, wherein receiving the TDM multi-port SRS transmission comprises measuring the multi-port transmission at a power level, the power level being at least one of: (a) reducing, for one of the simultaneous uplink signal transmission and the SRS transmission power level, such that the sum is equal to or lower than the maximum transmission power of the UE; (b) reducing in the TDM multi-port SRS transmission so that the sum is equal to or lower than the maximum transmission power of the UE; or (c) suppressing the TDM multi-port SRS transmission for resources overlapping with the simultaneous uplink signal transmission.

40. A wireless communication device comprising: Communication interface; and signal processing hardware connected to the communication interface, the communication interface and the signal processing hardware being configured to cooperatively perform the method of any one of claims 1 to 39.

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