Signaling sequence of sounding reference signal resource indicator set for uplink repetition

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment may receive at least one sounding reference signal (SRS) resource set configuration for a plurality of SRS resources, the SRS resources corresponding to respective SRS ports on which an SRS is to be transmitted; transmitting the SRS using the SRS resource; receiving downlink control information identifying a sequence of SRS resource indicator (SRI) sets, wherein the SRI sets identify one or more of the SRS resources for transmitting the SRS; and transmitting a plurality of repetitions of the uplink communication based at least in part on the sequence of the SRI set, where the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports associated with one or more SRS resources identified based at least in part on the SRI set. Numerous other aspects are provided.

Description

[0001] This application is a divisional application of the patent application titled "Signaling Sequences of Sounding Reference Signal Resource Indicator Collections for Uplink Repetitions" with the application date of July 28, 2020 and the application number of 202080053797.5.

[0002] Cross - reference to related applications

[0003] This patent application claims the priority of the Greek patent application No. 20190100351 titled "SIGNALING SEQUENCES OF SOUNDING REFERENCE SIGNAL RESOURCE INDICATOR COLLECTIONS FOR UPLINK REPETITIONS" filed on August 13, 2019 and the US non - provisional patent application No. 16 / 939,888 titled "SIGNALING SEQUENCES OF SOUNDING REFERENCE SIGNAL RESOURCE INDICATOR COLLECTIONS FOR UPLINK REPETITIONS" filed on July 27, 2020. Accordingly, these two applications are incorporated herein by reference in their entireties. Technical field

[0004] Broadly speaking, aspects of the present disclosure relate to wireless communication, and aspects of the present disclosure relate to techniques and apparatus for signaling sequences of collections of sounding reference signal (SRS) resource indicator (SRI) for uplink repetitions. Background art

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single - carrier frequency division multiple access (SC - FDMA) systems, time division synchronous code division multiple access (TD - SCDMA) systems, and Long Term Evolution (LTE). LTE / Advanced LTE is a collection of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0006] A wireless communication network may include multiple base stations (BSs) that can support communication for multiple user equipments (UEs). A user equipment (UE) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a new radio (NR) BS, a 5G Node B, etc.

[0007] The above multi-access technologies have been adopted by various telecommunication standards to provide a common protocol that enables different user equipments to communicate at the municipal, national, regional, or even global level. New radio (NR) (which may also be referred to as 5G) is a collection of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectral efficiency, reducing costs, improving services, leveraging new spectrums, and using orthogonal frequency division multiplexing with cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and to support beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation to better support mobile broadband network access. However, as the requirements for mobile broadband access continue to increase, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY OF THE INVENTION

[0008] In some aspects, a method of wireless communication performed by a UE may include: receiving a configuration for at least one set of sounding reference signal (SRS) resources for multiple SRS resources, the SRS resources corresponding to respective SRS ports on which SRS is to be transmitted; using the SRS resources to transmit SRS; receiving downlink control information identifying a sequence of SRS resource indicator (SRI) sets, where an SRI set identifies one or more of the SRS resources among the SRS resources for transmitting SRS; and transmitting multiple repetitions of uplink communication at least partially based on the sequence of the SRI sets, where the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, the one or more SRS ports being associated with the one or more SRS resources identified at least partially based on the SRI set.

[0009] In some aspects, a method of wireless communication performed by a base station may include: sending at least one SRS resource set configuration for a plurality of SRS resources; receiving SRS in the SRS resources; determining a sequence of SRI sets to be used by a UE to send multiple repetitions of uplink communication, where an SRI set identifies one or more SRS resources in the SRS resources for receiving the SRS; and sending downlink control information to the UE identifying the sequence of the SRI sets.

[0010] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive at least one SRS resource set configuration for a plurality of SRS resources, the SRS resources corresponding to respective SRS ports on which to send SRS; use the SRS resources to send SRS; receive downlink control information identifying a sequence of SRI sets, where an SRI set identifies one or more SRS resources in the SRS resources for sending SRS; and send multiple repetitions of uplink communication at least in part based on the sequence of the SRI sets, where the repetitions are sent using one or more uplink ports corresponding to one or more SRS ports, the one or more SRS ports being associated with the one or more SRS resources identified at least in part based on the SRI set.

[0011] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: send at least one SRS resource set configuration for a plurality of SRS resources; receive SRS in the SRS resources; determine a sequence of SRI sets to be used by a UE to send multiple repetitions of uplink communication, where an SRI set identifies one or more SRS resources in the SRS resources for receiving the SRS; and send downlink control information to the UE identifying the sequence of the SRI sets.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a UE, the one or more processors may be caused to perform the following operations: receive at least one SRS resource set configuration for a plurality of SRS resources, the SRS resources corresponding to respective SRS ports on which to transmit SRS; use the SRS resources to transmit SRS; receive downlink control information identifying a sequence of SRI sets, where an SRI set identifies one or more of the SRS resources among the SRS resources for transmitting SRS; and transmit a plurality of repetitions of uplink communication at least in part based on the sequence of the SRI sets, where the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, the one or more SRS ports being associated with the one or more SRS resources identified at least in part based on the SRI sets.

[0013] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a base station, the one or more processors may be caused to perform the following operations: transmit at least one SRS resource set configuration for a plurality of SRS resources; receive SRS in the SRS resources; determine a sequence of SRI sets to be used by a UE to transmit a plurality of repetitions of uplink communication, where an SRI set identifies one or more of the SRS resources among the SRS resources for receiving the SRS; and transmit downlink control information identifying the sequence of the SRI sets to the UE.

[0014] In some aspects, an apparatus for wireless communication may include: means for receiving at least one SRS resource set configuration for a plurality of SRS resources, the SRS resources corresponding to respective SRS ports on which to transmit SRS; means for using the SRS resources to transmit SRS; means for receiving downlink control information identifying a sequence of SRI sets, where an SRI set identifies one or more of the SRS resources among the SRS resources for transmitting SRS; and means for transmitting a plurality of repetitions of uplink communication at least in part based on the sequence of the SRI sets, where the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, the one or more SRS ports being associated with the one or more SRS resources identified at least in part based on the SRI sets.

[0015] In some aspects, an apparatus for wireless communication may include: a unit for transmitting at least one SRS resource set configuration for a plurality of SRS resources; a unit for receiving SRS in the SRS resources; a unit for determining a sequence of a plurality of sets of SRIs to be used by a UE to transmit repetitions of uplink communication, where a set of SRIs identifies one or more SRS resources in the SRS resources for receiving the SRS; and a unit for transmitting downlink control information identifying the sequence of the sets of SRIs to the UE.

[0016] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as generally described herein with reference to the figures and the specification and as illustrated by the figures and the specification.

[0017] The features and technical advantages of the examples have been outlined above rather broadly in accordance with the present disclosure so that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. For the same purpose of implementing the present disclosure, the disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the figures, the characteristics (both the organization and the method of operation) of the concepts disclosed herein, together with the associated advantages, will be better understood from the following description. Each of the figures in the drawings is provided for purposes of illustration and description and is not a limitation on the scope of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To understand the above features of the present disclosure in detail, reference may be made to the aspects described in more detail above, some of which are illustrated in the figures. However, it should be noted that the figures only illustrate certain typical aspects of the present disclosure and are therefore not considered to be a limitation on its scope, as the specification may admit other equally effective aspects. The same reference numerals in different figures may identify the same or similar elements.

[0019] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network according to various aspects of the present disclosure.

[0020] Figure 2 is a block diagram conceptually illustrating an example of communication between a base station and a UE in a wireless communication network according to various aspects of the present disclosure.

[0021] Figure 3 is a schematic diagram illustrating an example of configuring an SRS resource set according to various aspects of the present disclosure.

[0022] Figure 4 and Figure 5 is a schematic diagram showing an example of a signaling sequence of an SRI set for uplink repetition according to various aspects of the present disclosure.

[0023] Figure 6 is a schematic diagram showing an example process, such as that performed by a UE, according to various aspects of the present disclosure.

[0024] Figure 7 is a schematic diagram showing an example process, such as that performed by a base station, according to various aspects of the present disclosure. Detailed Description

[0025] Aspects of the present disclosure are described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently or in combination with any other aspect of the present disclosure. For example, a device may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions different from those of the aspects of the present disclosure set forth herein or other than the aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

[0026] Certain aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in the detailed description below and illustrated in the drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or any combination thereof. Whether these elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0027] It should be noted that although terms commonly associated with 3G and / or 4G wireless technologies are used herein to describe aspects of the present disclosure, aspects of the present disclosure may also be applied to other generation-based communication systems (such as 5G and later technologies, which include NR technology).

[0028] Figure 1FIG. 0 is a schematic diagram of a wireless network 100 in which aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (such as, a 5G or NR network). The wireless network 100 may include a plurality of BSs 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A BS is an entity that communicates with a user equipment (UE), and a BS may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, depending on the context in which the term is used, the term "cell" may refer to the coverage area of a BS and / or the BS subsystem serving that coverage area.

[0029] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., with a radius of several kilometers), and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area, and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence), and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 the example shown, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0030] In some aspects, a cell may not necessarily be stationary, and the geographic area of a cell may move according to the location of a moving BS. In some aspects, a BS may use any suitable transport network to interconnect with each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.).

[0031] The wireless network 100 may also include relay stations. A relay station is an entity that can receive the transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay the transmissions of other UEs. In Figure 1 the example shown, the relay station 110d can communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a repeater, etc.

[0032] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 watts to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 watt to 2 watts).

[0033] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, e.g., via a wireless backhaul or a wired backhaul.

[0034] UEs 120 (e.g., UEs 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a user unit, a station, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, a ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio device), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0035] Some UEs may be considered machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC UEs and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired communication link or a wireless communication link. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 such as a processor component, a memory component, etc.

[0036] Generally, any number of wireless networks may be deployed in a given geographical area. Each wireless network may support a specific RAT and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0037] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using the base station 110 as an intermediate device to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), a mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein that are performed by the base station 110.

[0038] As indicated above, Figure 1 is provided as an example. Other examples may be different from the examples described with reference to Figure 1 which.

[0039] Figure 2 FIG. 200 shows a block diagram 200 of a design solution 200 of a base station 110 and a UE 120, where the base station 110 and the UE 120 may be Figure 1 one of the base stations in Figure 1One of the UEs in the UE. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, where typically T≥1 and R≥1.

[0040] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCSs) for the UE at least in part based on the channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE at least in part based on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to an analog signal, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from the modulators 232a to 232t may be transmitted via the T antennas 234a to 234t, respectively. According to various aspects described in detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0041] At the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 and / or other base stations and may respectively provide the received signals to demodulators (DEMOD) 254a through 254r. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The channel processor may determine the reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components in the UE 120 may be included in a housing.

[0042] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262, as well as control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, the uplink signals from the UE 120 and other UEs may be received by the antennas 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0043] Figure 2The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component may perform one or more techniques associated with a signaling sequence for a set of SRIs for uplink repetition, as described in detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 any other component may perform or direct the operation of, for example Figure 6 procedure 600, Figure 7 procedure 700, and / or other procedures as described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when the one or more instructions are executed by one or more processors of the base station 110 and / or the UE 120, they may perform or direct the operation of, for example Figure 6 procedure 600, Figure 7 procedure 700, and / or other procedures described herein. The scheduler 246 may schedule data transmissions of the UE on the downlink and / or the uplink.

[0044] In some aspects, the UE 120 may include: a unit for receiving at least one SRS resource set configuration for a plurality of SRS resources, the plurality of SRS resources corresponding to respective SRS ports on which the SRS is to be transmitted; a unit for transmitting the SRS using the SRS resources; a unit for receiving downlink control information identifying a sequence of a set of SRIs; a unit for transmitting multiple repetitions of uplink communication based at least in part on the sequence of the set of SRIs, and so on. In some aspects, such units may include one or more components of the UE 120 described in conjunction with Figure 2 such as the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, the DEMOD 254, the MIMO detector 256, the receive processor 258, and so on.

[0045] In some aspects, the base station 110 may include: a unit for transmitting at least one SRS resource set configuration for a plurality of SRS resources; a unit for receiving the SRS in the SRS resources; a unit for determining a sequence of a set of SRIs for multiple repetitions of uplink communication to be used by the UE; a unit for transmitting downlink control information identifying the sequence of the set of SRIs to the UE, etc. In some aspects, such units may include those described in conjunction with Figure 2One or more components of the described base station 110, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and so on.

[0046] As indicated above, Figure 2 is provided as an example. Other examples may be different from the example Figure 2 described with reference to

[0047] Figure 3 is a schematic diagram showing an example 300 of configuring an SRS resource set according to various aspects of the present disclosure.

[0048] The base station may configure the UE with one or more SRS resource sets to allocate resources for SRS transmissions performed by the UE. For example, the configuration for the SRS resource set may be indicated in a radio resource control (RRC) message (e.g., RRC configuration message, RRC reconfiguration message, etc.). As shown by reference numeral 305, the SRS resource set may include one or more resources (e.g., shown as SRS resources), which may include time resources and / or frequency resources (e.g., time slots, symbols, resource blocks, periodicity for time resources, etc.).

[0049] As shown by reference numeral 310, the SRS resource may correspond to an antenna port (e.g., SRS port) on which the SRS will be transmitted (e.g., in the time-frequency resource). In some aspects, the configuration for the SRS resource set may indicate the use case for the SRS resource set (e.g., in the SRS-SetUse information element). For example, the SRS resource set may have use cases such as antenna switching, codebook, non-codebook, beam management, and so on.

[0050] The antenna switching SRS resource set may be used to indicate downlink channel state information (CSI) having reciprocity between the uplink channel and the downlink channel. For example, when there is reciprocity between the uplink channel and the downlink channel, the base station may use antenna switching SRS (e.g., SRS transmitted using the resources of the antenna switching SRS resource set) to obtain downlink CSI (e.g., to determine the downlink precoder for communicating with the UE).

[0051] When the base station indicates an uplink precoder to the UE, a codebook SRS resource set can be used to indicate uplink CSI. For example, when the base station is configured to indicate an uplink precoder to the UE (e.g., using a precoder codebook), the base station can use codebook SRS (e.g., SRS transmitted using resources of a codebook SRS resource set) to obtain uplink CSI (e.g., to determine the uplink precoder to be indicated to the UE, and the UE uses this uplink precoder to communicate with the base station).

[0052] When the UE selects an uplink precoder (e.g., instead of the base station indicating the uplink precoder to be used by the UE), a non-codebook SRS resource set can be used to indicate uplink CSI. For example, when the UE is configured to select an uplink precoder, the base station can use non-codebook SRS (e.g., SRS transmitted using resources of a non-codebook SRS resource set) to obtain uplink CSI. In this case, the precoder selected by the UE (e.g., which can be indicated to the base station) can be used to precode the non-codebook SRS.

[0053] The beam management SRS resource set can be used to indicate CSI for millimeter wave communication.

[0054] The UE can use the SRS resources configured by the SRS resource set to send SRS to the base station. The SRS resources for SRS transmission can be identified by the SRI. Additionally, the SRS resources can be the SRS resources of a non-codebook SRS resource set. The base station can determine one or more SRS resources (corresponding to one or more SRS ports) that the UE will use to send uplink communication based on the SRS transmission. The base station can send downlink control information (DCI) providing an indication of the determined SRS resources to the UE. For example, the determined SRS resources can be indicated in the SRI field of the DCI. Four bits can be allocated to the SRI field, enabling the base station to use the SRI field to indicate one of sixteen possible combinations of SRS resources (e.g., combinations of up to four SRS resources with a transmission rank of one, two, three, or four). The UE can use the uplink port corresponding to the SRS port of the SRS resources identified by the SRI of the DCI to send uplink communication (e.g., via the physical uplink shared channel (PUSCH)).

[0055] In some cases, the UE can be configured to send multiple repetitions of uplink communication. For example, the UE can send multiple repetitions of uplink communication on different beams to improve the transmission diversity of uplink communication. However, according to the current wireless communication system, each repetition using a different beam is individually scheduled by DCI. For example, each repetition is scheduled by indicating a specific SRI for each repetition through DCI, resulting in an increase in latency.

[0056] Some of the techniques and apparatuses described herein enable a base station to use a single DCI to indicate a sequence of multiple repeated sets of SRIs for uplink communication, thereby reducing the latency associated with scheduling multiple repetitions separately. In this way, the UE can transmit multiple repetitions of the uplink communication by using different beams, different precoders, different antenna panels, etc., according to the sequence of SRI sets, thereby improving transmission diversity.

[0057] As indicated above, Figure 3 is provided as an example. Other examples may be different from the examples described with reference to Figure 3 the examples.

[0058] Figure 4 is a schematic diagram of an example 400 of a signaling sequence for a set of SRIs for uplink repetition according to various aspects of the present disclosure. As Figure 4 shown, the base station 110 may provide information to the UE 120 such that the UE 120 can identify a sequence of sets of SRIs to be used by the UE 120 for transmitting multiple repetitions of the uplink communication. In some aspects, the UE 120 may be configured with a mapping of the sequence of sets of SRIs to index values. For example, the base station 110 may send a configuration for this mapping to the UE 110 via RRC signaling or a media access control (MAC) control element (CE).

[0059] In some aspects, the UE 120 may be configured with a set of mappings related to a specific transmission rank (e.g., a specific number of transmission layers). For example, the UE 120 may be configured with a first set of mappings related to a transmission rank of 1 (i.e., the set of SRIs of this mapping identifies one SRS resource), a second set of mappings related to a transmission rank of 2 (i.e., the set of SRIs of this mapping identifies two SRS resources), a third set of mappings related to a transmission rank of 3 (i.e., the set of SRIs of this mapping identifies three SRS resources), a fourth set of mappings related to a transmission rank of 4 (i.e., the set of SRIs of this mapping identifies four SRS resources), and so on.

[0060] As Figure 4As shown, the mapping set 410 may be associated with a transmission rank of 2. The sequence of the mapping set 410 may identify a set of SRIs for a particular number of repetitions. For example, the sequence of the mapping set 410 identifies a set of SRIs for two repetitions. In some aspects, the sequence may identify a set of SRIs for another number of repetitions (e.g., four repetitions, eight repetitions, sixteen repetitions, etc.). Each set of SRIs (e.g., 01) of the sequence may include one or more SRIs that identify one or more SRS resources corresponding to one or more antenna ports (i.e., SRS ports) of the UE 120. For example, the set of SRIs 01 may identify SRS port 0 and SRS port 1 of the UE 120.

[0061] The mapping set 410 may include a first mapping 420 of a sequence of sets of SRIs to index values and a second mapping 430 of a sequence of sets of SRIs to index values. In some aspects, the mapping set 410 may include more than two mappings. The first mapping 420 and the second mapping 430 (and any other mappings included in the mapping set 410) may be indexed according to the same index values. In other words, the first sequence of the first mapping 420 may be indexed to a first index value (index = 0), and the first sequence of the second mapping 430 may also be indexed to the first index value (index = 0), the second sequence of the first mapping 420 may be indexed to a second index value (index = 1), and the second sequence of the second mapping 430 may also be indexed to the second index value (index = 1), and so on. In this way, the mapping set 410 may use a relatively small number of index values (e.g., sixteen index values) to identify a sequence of any number of sets of SRIs (e.g., thirty-two sequences).

[0062] As Figure 4 As indicated by reference numeral 440, the base station 110 may send a configuration identifying the transmission rank, and the UE 120 may receive the configuration identifying the transmission rank. For example, the base station 110 may send a configuration identifying the transmission rank via RRC signaling or MAC CE. The transmission rank may enable the UE 120 to identify a particular mapping set that the UE 120 is to use. For example, a configuration identifying a transmission rank of 2 may enable the UE 120 to identify the mapping set 410 (which identifies a set of SRIs for a transmission rank of 2) that the UE 120 is to use. In some aspects, the configuration may configure multiple repetitions of communication associated with the transmission rank on multiple PUSCHs.

[0063] As shown by reference numeral 450, the base station 110 may transmit control information (e.g., DCI, such as having DCI format 0_1) that provides scheduling for the communication of the UE 120 on the PUSCH, and the UE 120 may receive control information (e.g., DCI, such as having DCI format 0_1) that provides scheduling for the communication of the UE 120 on the PUSCH. For example, the control information may schedule multiple repetitions of the communication on multiple PUSCHs (e.g., the control information may schedule a first PUSCH and a second PUSCH). The control information may also identify a sequence of SRI sets to be used by the UE 120 to transmit multiple repetitions of the communication.

[0064] In some aspects, the control information may use a first field and a second field of the control information to identify a sequence of SRI sets. For example, the first field may be the SRI field of the control information, and the second field may be the antenna port field of the control information. In some cases, four bits may be allocated to the SRI field, allowing the SRI field to identify a sequence of up to 16 SRI sets. In some cases, one or more reserved bits may be allocated to the antenna port field of the control information. Thus, combining one reserved bit of the antenna port field with the four bits of the SRI field allows identification of a sequence of up to thirty-two SRI sets. Additionally, when more than one reserved bit is allocated to the antenna port field, additional sequences of SRI sets may be identified.

[0065] In some aspects, the value of the first field (e.g., the SRI field) identifies an index value of a set of mappings (e.g., a set of mappings having a transmission rank indicated by the configuration), and the value of the second field (e.g., the value indicated in one or more reserved bits of the antenna port field) identifies a particular mapping in the set of mappings. For example, referring to the set of mappings 410, the first field (e.g., the SRI field) may indicate an index value of 2, which may refer to the sequence 01, 12 of the first mapping 420 or the sequence 13, 23 of the second mapping 430. Continuing the previous example, the second field (e.g., the antenna port field) may have a value of 0 to indicate that the index value 2 refers to the first mapping 420, or a value of 1 to indicate that the index value 2 refers to the second mapping 430.

[0066] As shown by reference numeral 460, UE 120 may identify the sequence of SRI sets based on control information. For example, UE 120 may process the control information to identify the value of a first field and the value of a second field. Based on the value of the first field (e.g., 2) and the value of the second field (e.g., 1), and with reference to mapping set 410, UE 120 may identify the sequence of SRI sets (e.g., 13, 23). For example, UE 120 may identify the index value of mapping set 410 based on the value of the first field (e.g., the SRI field), and may identify a specific mapping of mapping set 410 based on the value of the second field (e.g., the value indicated in one or more reserved bits of the antenna port field).

[0067] As shown by reference numeral 470, UE 120 may send multiple repetitions (e.g., sent to multiple TRPs) of an uplink communication (e.g., a transport block) according to the identified sequence of SRI sets. In some aspects, UE 120 may determine one or more uplink ports to be used for the repetitions based on one or more SRS resources identified by the SRI set. For example, the SRS resource may correspond to an SRS port (e.g., antenna port 1), and UE 120 may determine the corresponding uplink port (e.g., antenna port 1) based on the SRS port.

[0068] UE 120 may use a first SRI set (e.g., 13) indicating a sequence of a first combination of uplink ports to send a first repetition (e.g., a first PUSCH), use a second SRI set (e.g., 23) indicating a sequence of a second combination of uplink ports to send a second repetition (e.g., a second PUSCH), and so on. In some cases, the number of repetitions configured for UE 120 may be greater than the number of SRI sets in the sequence. In such a case, UE 120 may send sequential repetitions using sequential cycles of the sequence of SRI sets.

[0069] As indicated above, Figure 4 is provided as an example. Other examples may be different from the example described with reference to Figure 4 .

[0070] Figure 5 is a schematic diagram of example 500 showing a signaling sequence of SRI sets for uplink repetition according to various aspects of the present disclosure. As Figure 5 shown, base station 110 may provide information to UE 120 such that UE 120 can identify the sequence of SRI sets to be used by UE 120 to send multiple repetitions of an uplink communication.

[0071] As Figure 5As indicated by reference numeral 520, the base station 110 may send a configuration for mapping (e.g., mapping 510) the sequences of an SRI set to index values, and the UE 120 may receive a configuration for mapping (e.g., mapping 510) the sequences of an SRI set to index values. For example, the base station 110 may send, via RRC signaling, a configuration that identifies the mapping. In some aspects, the configuration or another RRC configuration may also identify whether the UE 120 uses the mapping or the default interpretation indicated by the SRI (e.g., thereby using the same precoder or beam for all repetitions) to transmit uplink communications.

[0072] Mapping 510 may identify sequences of multiple SRI sets for different transmission ranks. For example, as Figure 5 shown, mapping 510 identifies sequences of two SRI sets with a transmission rank of 2 (index = 0, index = 1), a sequence of an SRI set with a transmission rank of 1 (index = 2), and a sequence of an SRI set with a transmission rank of 3 (index = 15). The sequence of mapping 510 may identify an SRI set for a particular number of repetitions. For example, as Figure 5 shown, the sequence of mapping 510 identifies an SRI set for four repetitions. In some aspects, the sequence may identify an SRI set for another number of repetitions (e.g., two repetitions, eight repetitions, sixteen repetitions, etc.). Additionally, mapping 510 may identify the number of sequences of SRI sets (e.g., sixteen) corresponding to the number of sequences that can be identified by a field of control information sent by the base station 110 (e.g., an SRI field that may be allocated four bits).

[0073] In some aspects, mapping 510 may identify sequences of multiple SRI sets for the same transmission rank. In this case, mapping 510 may identify the number of sequences of SRI sets that is greater than the number of sequences that can be identified by a field of control information (e.g., an SRI field) sent by the base station 110.

[0074] In some aspects, the mapping 510 can be a primary mapping that includes the number of sequences in the SRI set (e.g., 64 sequences), where the number is greater than the number of sequences that can be identified by the fields of the control information (e.g., SRI field) sent by the base station 110. In this case, the base station 110 can send information identifying a secondary mapping, and the UE 120 can receive the information identifying the secondary mapping, which includes a subset of the sequences of the primary mapping (e.g., a down-selection). For example, the secondary mapping can include at most the number of sequences in the SRI set corresponding to the number of sequences that can be identified by the fields of the control information (e.g., SRI field) sent by the base station 110. The base station 110 can send the information identifying the secondary mapping to the UE 120 via MAC CE. In this way, the base station 110 can update the secondary mapping more frequently than the primary mapping.

[0075] As shown by reference numeral 530, the base station 110 can send control information (e.g., DCI, such as having DCI format 0_1) that provides scheduling for the communication of the UE 120 on the PUSCH, and the UE 120 can receive the control information (e.g., DCI, such as having DCI format 0_1) that provides scheduling for the communication of the UE 120 on the PUSCH. For example, the control information can schedule multiple repetitions of the communication on multiple PUSCHs. The control information can also identify the sequences of the SRI set to be used by the UE 120 to send multiple repetitions of the communication. In some aspects, the control information can identify the index value of the mapping 510 (or the secondary mapping). For example, the value of the field (e.g., SRI field) of the control information can identify the index value. In some aspects, when the mapping 510 identifies the sequences of the SRI set with the same transmission rank, the control information can use the first field (e.g., SRI field) and the second field (e.g., antenna port field) of the control information to identify the sequences of the SRI set.

[0076] As shown by reference numeral 540, the UE 120 can identify the sequences of the SRI set based on the control information. For example, the UE 120 can process the control information to identify the index value. Based on the index value and referring to the mapping 510, the UE 120 can identify the sequences of the SRI set.

[0077] In some aspects, when the mapping 510 identifies a sequence of SRI sets with the same transmission rank, the UE 120 may determine that the control information is using a first field (e.g., the SRI field) and a second field (e.g., the antenna port field) to identify the sequence of SRI sets. For example, the UE 120 may determine that the control information is using the first field and the second field to identify the sequence of SRI sets at least in part based on the following determination: the number of sequences of SRI sets that can be identified by the first field (e.g., sixteen) is less than the number of sequences of SRI sets in the mapping 510 (e.g., thirty-two). In this case, the UE 120 may process the control information to identify the value of the first field and the value of the second field. Based on the value of the first field and the value of the second field, and with reference to the mapping 510, the UE 120 may identify the sequence of SRI sets.

[0078] For example, the value of the first field (e.g., the SRI field) may indicate the index position of the sequence within a particular sequence group, and the value of the second field (e.g., the antenna port field) may indicate the particular sequence group. Each sequence group may include a maximum number of sequences corresponding to the number of sequences that can be identified by the first field. For example, if the first field (e.g., the SRI field) can identify sixteen sequences and the mapping 510 identifies thirty-two sequences, the UE 120 may determine that the mapping 510 is divided into two groups of sixteen sequences. Thus, the first group may be identified by a first value (e.g., 0) of the second field, and the second group may be identified by a second value (e.g., 1) of the second field.

[0079] In some aspects, the value of the second field may be indicated in one or more reserved bits of the second field (e.g., one or more reserved bits of the antenna port field). In this case, the UE 120 may identify the position of the reserved bits in the second field based on the demodulation reference signal (DMRS) identifier of the control information and the transmission rank of the SRI sets in the mapping 510. As Figure 5 shown, the UE 120 may be configured with one or more DMRS port tables. Referring to the DMRS port table 560, a particular combination of the DMRS identifier (e.g., 1) and the transmission rank (e.g., 2) may indicate that the reserved bits are located in rows 4 - 7 of the second field (e.g., DMRS port table 560).

[0080] As shown by reference numeral 550, the UE 120 may send multiple repetitions (e.g., sent to multiple TRPs) of an uplink communication (e.g., a transport block) according to the sequence of the identified SRI sets, as described in more detail above. In some cases, the number of repetitions configured for the UE 120 may be greater than the number of SRI sets in the sequence. In some aspects, the UE 120 may use at least one copy of each SRI set in a cycle through the sequence of SRI sets to send sequential repetitions. For example, referring to mapping 510, the UE may send eight repetitions as 01, 01, 12, 12, 23, 23, 01, 01 according to the sequence with index = 1. In some aspects, the UE 120 may use more than one cycle through the sequence of SRI sets to send sequential repetitions. For example, referring to mapping 510, the UE may send eight repetitions as 01, 12, 23, 01, 01, 12, 23, 01 according to the sequence with index = 1. In some aspects, the base station 110 may send an indication (e.g., via RRC signaling) as to whether the UE 120 is to use copies or multiple cycles to send repetitions.

[0081] As indicated above, Figure 5 is provided as an example. Other examples may be different from the examples Figure 5 described with reference to

[0082] Figure 6 is a schematic diagram showing an example process 600, such as performed by a UE, in accordance with various aspects of the present disclosure. Example process 600 is an example of operations performed by a UE (e.g., UE 120, etc.) associated with a signaling sequence of SRI sets for uplink repetition.

[0083] As Figure 6 shown, in some aspects, process 600 may include: receiving at least one SRS resource set configuration for a plurality of SRS resources, the plurality of SRS resources corresponding to respective SRS ports on which to send SRS (block 610). For example, the UE may receive (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) at least one SRS resource set configuration for a plurality of SRS resources, the plurality of SRS resources corresponding to respective SRS ports on which to send SRS, as described above.

[0084] As Figure 6As further shown, in some aspects, process 600 may include: transmitting a sounding reference signal (SRS) using SRS resources (block 620). For example, the UE may transmit the SRS using SRS resources (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) as described above.

[0085] As Figure 6 As further shown, in some aspects, process 600 may include: receiving downlink control information identifying a sequence of a set of sounding resource indicators (SRIs), where the set of SRIs identifies one or more SRS resources in the SRS resources for transmitting the SRS (block 630). For example, the UE may receive the downlink control information identifying the sequence of the set of SRIs (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) as described above. In some aspects, the set of SRIs identifies one or more SRS resources in the SRS resources for transmitting the SRS.

[0086] As Figure 6 As further shown, in some aspects, process 600 may include: transmitting multiple repetitions of an uplink communication at least in part based on the sequence of the set of SRIs, where the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, and the one or more SRS ports are associated with one or more SRS resources identified at least in part based on the set of SRIs (block 640). For example, the UE may transmit multiple repetitions of the uplink communication at least in part based on the sequence of the set of SRIs (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) as described above. In some aspects, the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, and the one or more SRS ports are associated with the SRS resources identified at least in part based on the set of SRIs.

[0087] Process 600 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or aspects that incorporate one or more other processes described elsewhere herein.

[0088] In a first aspect, the downlink control information uses a first field of the downlink control information and a second field of the downlink control information to identify the sequence of the set of SRIs. In a second aspect, alone or in combination with the first aspect, the first field is the SRI field of the downlink control information, and the second field is the antenna port field of the downlink control information.

[0089] In a third aspect, either alone or in combination with one or more of the first and second aspects, the value of the first field identifies an index value of a specific mapping of sequence to index values of an SRI set, and the value of the second field identifies the specific mapping. In a fourth aspect, either alone or in combination with one or more of the first to third aspects, process 600 further includes: receiving a configuration that identifies a transmission rank associated with an SRI set in the sequence of SRI sets, and the specific mapping is associated with the transmission rank.

[0090] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 600 further includes: receiving information that identifies a mapping of a sequence of SRI sets to index values. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the information that identifies the mapping identifies a secondary mapping that includes a subset of the sequence of SRI sets included in a primary mapping.

[0091] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the downlink control information identifies the index value of the mapping. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, in a cycle through the sequence of SRI sets, at least one copy of each SRI set is used to transmit the plurality of repetitions. In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, more than one cycle through the sequence of SRI sets is used to transmit the plurality of repetitions.

[0092] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 600 further includes: receiving information identifying a mapping of a sequence of SRI sets to index values, wherein the SRI sets in the sequence of SRI sets have the same transmission rank, and the downlink control information uses a first field of the downlink control information and a second field of the downlink control information to identify the sequence of SRI sets. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, process 600 further includes: determining that the second field is being used to identify the sequence of SRI sets, at least in part based on a determination that the number of sequences of SRI sets that can be identified by the first field is less than the number of sequences of the mapped SRI sets. In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, process 600 further includes: identifying, at least in part based on a demodulation reference signal identifier of the downlink control information and the transmission rank, a position in the second field that is being used to identify the sequence of SRI sets.

[0093] In a thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the at least one SRS resource set is configured for a non-codebook SRS resource set.

[0094] Although Figure 6 example blocks of process 600 are shown, in some aspects, process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks compared to those described in Figure 6 In addition, or alternatively, two or more of the blocks of process 600 may be executed in parallel.

[0095] Figure 7 is a schematic diagram showing an example process 700, such as performed by a base station, in accordance with various aspects of the present disclosure. Example process 700 is an example of operations performed by a base station (e.g., base station 110, etc.) associated with a signaling sequence of a sounding reference signal resource indicator set for uplink repetition.

[0096] As Figure 7 shown, in some aspects, process 700 may include: transmitting at least one SRS resource set configuration for a plurality of SRS resources (block 710). For example, the base station may transmit at least one SRS resource set configuration for a plurality of SRS resources (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.), as described above.

[0097] As Figure 7As further shown, in some aspects, process 700 may include: receiving a sounding reference signal (SRS) in an SRS resource (block 720). For example, a base station may receive an SRS in an SRS resource (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.), as described above.

[0098] As Figure 7 As further shown, in some aspects, process 700 may include: determining a sequence to be used by a UE to transmit a plurality of sets of repeated SRI for uplink communication, where the SRI sets identify one or more SRS resources in the SRS resource for receiving the SRS (block 730). For example, a base station may determine a sequence to be used by a UE to transmit a plurality of sets of repeated SRI for uplink communication (e.g., using controller / processor 240, etc.), as described above. In some aspects, the SRI sets identify one or more SRS resources in the SRS resource for receiving the SRS.

[0099] As Figure 7 As further shown, in some aspects, process 700 may include: sending downlink control information identifying the sequence of SRI sets to the UE (block 740). For example, a base station may send downlink control information identifying the sequence of SRI sets to the UE (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.), as described above.

[0100] Process 700 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or aspects that incorporate one or more other processes described elsewhere herein.

[0101] In a first aspect, the downlink control information uses a first field of the downlink control information and a second field of the downlink control information to identify the sequence of SRI sets. In a second aspect, either alone or in combination with the first aspect, the first field is the SRI field of the downlink control information, and the second field is the antenna port field of the downlink control information.

[0102] In a third aspect, either alone or in combination with one or more of the first and second aspects, the value of the first field identifies an index value of a specific mapping of sequence to index values of the SRI set, and the value of the second field identifies the specific mapping. In a fourth aspect, either alone or in combination with one or more of the first to third aspects, process 700 further includes: sending a configuration identifying a transmission rank associated with the SRI set in the sequence of SRI sets, wherein the specific mapping is associated with the transmission rank.

[0103] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 700 further includes: sending information identifying a mapping of sequence to index values of the SRI set. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the information identifying the mapping identifies a secondary mapping that includes a subset of the sequence of SRI sets included in a primary mapping.

[0104] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the downlink control information identifies the index value of the mapping. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, process 700 further includes: sending an indication that the UE will use one copy of each SRI set in a cycle through the sequence of SRI sets to send the plurality of repetitions. In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 700 further includes: sending an indication that the UE will use more than one cycle through the sequence of SRI sets to send the plurality of repetitions.

[0105] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 700 further includes: sending an indication identifying a mapping of sequence to index values of the SRI set, wherein the SRI sets in the sequence of SRI sets have the same transmission rank, and the downlink control information uses a first field of the downlink control information and a second field of the downlink control information to identify the sequence of SRI sets.

[0106] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the at least one SRS resource set is configured for a non-codebook SRS resource set.

[0107] Although Figure 7 illustrative blocks of process 700 are shown, in some aspects, with Figure 7Compared to that described in [reference], process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks. Additionally or alternatively, two or more of the blocks of process 700 may be executed in parallel.

[0108] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise forms disclosed. Modifications and variations can be made in light of the above disclosure, or such modifications and variations can be obtained from practice of the aspects.

[0109] As used herein, the term "component" is intended to be broadly construed as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0110] As used herein, depending on the context, meeting a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0111] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods is not a limitation on the aspects. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code - it being understood that software and hardware can be designed to implement the systems and / or methods at least in part based on the description herein.

[0112] Even though specific combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features can be combined in ways not expressly recited in the claims and / or not disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of the various aspects includes each dependent claim in combination with every other claim in the claim set. The phrase "at least one of" in a list of items refers to any combination of those items, including a single member. By way of example, "at least one of a, b, or c" is intended to cover: a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination of the same elements in multiples (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c or any other ordering of a, b, and c).

[0113] Unless explicitly described as such, the elements, actions or instructions used herein should not be interpreted as decisive or essential. In addition, as used herein, the articles "a" and "an" are intended to include one or more entries, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more entries (e.g., related entries, unrelated entries, combinations of related entries and unrelated entries, etc.), and can be used interchangeably with "one or more". In places where only one entry is meant, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" etc. are intended to be open-ended terms. Further, unless otherwise expressly provided, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: receiving at least one SRS resource set configuration for a plurality of sounding reference signal (SRS) resources, the plurality of SRS resources corresponding to respective SRS ports on which SRS is to be transmitted; using the SRS resources to transmit SRS; receiving downlink control information identifying a sequence of a set of SRS resource indicators (SRIs), wherein the set of SRIs identifies one or more SRS resources among the SRS resources for transmitting the SRS; and transmitting a plurality of repetitions of uplink communication at least partially based on the sequence of the set of SRIs, wherein the repetitions are transmitted using one or more uplink ports corresponding to one or more SRS ports, the one or more SRS ports being associated with the one or more SRS resources identified at least partially based on the set of SRIs.

Images