Multi-slot aperiodic sounding reference signal

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment can receive, from a base station, a sounding reference signal (SRS) configuration indicating a number of candidate slots for transmission of a multi-slot aperiodic SRS (A-SRS); receive, from the base station, an SRS trigger including an indication of an A-SRS resource set including a plurality of A-SRS resources corresponding to the number of candidate slots; and transmit, responsive to the SRS trigger, the multi-slot A-SRS in one or more of the plurality of candidate slots using at least a portion of the A-SRS resource set. Numerous other aspects are provided.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to PCT / CN2020 / 075169 entitled “MULTI-SLOT APERIODIC SOUNDING REFERENCE SIGNAL” filed on February 14, 2020, which is hereby expressly incorporated by reference herein.

[0003] The Art

[0004] Aspects of the present disclosure generally relate to wireless communication, and techniques and apparatuses for transmitting multi-slot aperiodic sounding reference signals.

[0005] BACKGROUND

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can 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 / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3 GPP).

[0007] A wireless communication network can include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) can communicate with a base station (BS) via the downlink and 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, a BS can 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, and / or the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocol that enables different user equipment to communicate on the same frequency. New Radio (NR), which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP- OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0009] SUMMARY

[0010] In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station (BS), a sounding reference signal (SRS) configuration indicating a number of candidate slots for transmission of a multi-slot aperiodic SRS (A-SRS); receiving, from the BS, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and transmitting, in response to the SRS trigger, the multi-slot A-SRS in one or more of the plurality of candidate slots using at least a portion of the set of A-SRS resources.

[0011] In some aspects, a method of wireless communication performed by a base station includes transmitting, to a UE, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS; transmitting, to the UE, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and receiving, in response to the SRS trigger, the multi-slot A-SRS, the multi-slot A-SRS being transmitted in one or more of the plurality of candidate slots using at least a portion of the set of A-SRS resources.

[0012] In some aspects, a UE for wireless communication can include a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: receive, from a BS, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS; receive, from the BS, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and transmit, in one or more of a plurality of candidate slots, the multi-slot A-SRS using at least a portion of the set of A-SRS resources in response to the SRS trigger.

[0013] In some aspects, a base station for wireless communication can include a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: transmit, to a UE, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS; transmit, to the UE, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and receive, in response to the SRS trigger, the multi-slot A-SRS transmitted in one or more of a plurality of candidate slots using at least a portion of the set of A-SRS resources.

[0014] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: receive, from a BS, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS; receive, from the BS, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and transmit, in one or more of a plurality of candidate slots, the multi-slot A-SRS using at least a portion of the set of A-SRS resources in response to the SRS trigger.

[0015] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the one or more processors to transmit, to a UE, a SRS configuration indicating a number of candidate slots for transmission of multi-slot A-SRS; transmit, to the UE, a SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and receive, in response to the SRS trigger, the multi-slot A-SRS transmitted using at least a portion of the set of A-SRS resources in one or more of the plurality of candidate slots.

[0016] In some aspects, an apparatus for wireless communication includes means for receiving, from a BS, a SRS configuration indicating a number of candidate slots for transmission of multi-slot A-SRS; means for receiving, from the BS, a SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and means for transmitting, in response to the SRS trigger, the multi-slot A-SRS using at least a portion of the set of A-SRS resources in one or more of the plurality of candidate slots.

[0017] In some aspects, an apparatus for wireless communication includes means for transmitting, to a UE, a SRS configuration indicating a number of candidate slots for transmission of multi-slot A-SRS; means for transmitting, to the UE, a SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots; and means for receiving, in response to the SRS trigger, the multi-slot A-SRS transmitted using at least a portion of the set of A-SRS resources in one or more of the plurality of candidate slots.

[0018] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and / or processing system as substantially described with reference to and as illustrated by the drawings and specification.

[0019] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows can be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be readily utilized as bases for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions are not to be regarded as a departure from the scope of the accompanying claims. The illustrative features and the operations described herein are combinable unless otherwise indicated. The characteristics of the concepts disclosed herein, both their organization and their method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each figure is provided by way of explanation and is not to be construed as a limitation. The figures are not necessarily drawn to scale. BRIEF DESCRIPTION OF DRAWINGS

[0021] For a more complete understanding of the above-described features of the present disclosure, reference is made to the following detailed description and claims, taken in connection with the following illustrative figures. Wherever applicable and as towards the practice of the disclosure, embodiments disclosed herein can suffer from alternative forms without departing from the scope of the present disclosure. Like reference numerals can refer to like elements throughout the figures.

[0022] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.

[0023] Figure 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.

[0024] Figure 3 is a diagram illustrating an example of transmitting an aperiodic sounding reference signal (A-SRS), in accordance with various aspects of the present disclosure.

[0025] Figure 4 and 5 is a diagram illustrating an example of transmitting a multi-slot aperiodic sounding reference signal, in accordance with various aspects of the present disclosure.

[0026] Figure 6 is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure.

[0027] Figure 7 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.

[0028] DETAILED DESCRIPTION

[0029] Current NR specifications support transmitting A-SRS in only one slot after a trigger. As such, a base station can trigger A-SRS multiple times to evaluate uplink channels associated with different antennas, different UEs, different channels, different aggregated carriers, and the like. Additionally, under current specifications, slot offset is the only A-SRS parameter that can be dynamically configured.

[0030] In some aspects, the techniques described herein can enable a base station to trigger A-SRS for transmission over more than one slot (referred to herein as “multi-slot A-SRS”). In some aspects, the techniques described herein for triggering multi-slot A-SRS using a single DCI transmission can facilitate enhanced SRS usefulness without increasing overhead. In some aspects, a base station can be able to dynamically configure a duration of A-SRS transmission, a periodicity of A-SRS transmission, and selection of SRS resources from a SRS resource set to be transmitted. Some aspects of this increased functionality can facilitate more efficient evaluation and scheduling of uplink channels, improving uplink reliability, quality of service, and the like.

[0031] Various aspects of the disclosure are described more fully below. However, the disclosure can be practiced with many types of electronic circuits and therefore the disclosure should not be construed as limited to any specific structures or functions unless explicitly stated otherwise. Rather, aspects are presented so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, others skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of, or combined with, any other aspect of the disclosure. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using, as alternative to, in combination with, or in addition to, the aspects set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be implemented by one or more elements of a claim.

[0032] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends on the specific application and design constraints imposed on the overall system.

[0033] It should be noted that while aspects can be described herein using terminology commonly associated with 3G and / or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.

[0034] Figure 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure can be practiced. The wireless network 100 can be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 can include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities. A BS is an entity that communicates with user equipment (UEs) and can also be referred to as a base station, a NR BS, a NodeB, a gNB, a 5G NB (NB), an access point, a transmit receive point (TRP), and / or the like. Each BS can provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used. In some aspects, a UE can be configured to transmit multi-slot aperiodic sounding reference signals (A-SRS) to a BS to facilitate uplink signal evaluation by the BS.

[0035] BSs can be referred to as a macro BS, a pico BS, a femto BS, and / or a Figure 1 In an example shown in FIG. 1, BS 110a can be a macro BS for a macro cell 102a, BS 110b can be a pico BS for a pico cell 102b, and BS 110c can be a femto BS for a femto cell 102c. A BS can support one or multiple (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” can be used interchangeably herein.

[0036] In some examples, a cell can not necessarily be stationary, and the geographic area of the cell can move, as the BS moves. In some examples, the BSs can be interconnected to one another 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 a direct physical connection, a virtual network, and / or the like using any suitable transport network.

[0037] Wireless network 100 can also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay station 1 lOd can communicate with macro BS 110a and a UE 120d in order to facilitate communications between the BS 110a and UE 120d. A relay station can also be referred to as a relay BS, a relay base station, a relay, and / or the like.

[0038] Wireless network 100 can be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and / or the like. These different types of BSs can have different transmit power levels, different coverage areas, and different impacts on interference. For example, macro BSs can have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs can have relatively lower transmit power levels (e.g., 0.1 to 2 Watts).

[0039] A network controller 130 can couple to a set of BSs and can provide coordination and control for these BSs. Network controller 130 can be in communication with the BSs via a backhaul. The BSs can also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.

[0040] The UEs 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE can 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

[0041] Some UEs can be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, e.g., robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that can communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node can provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet-of-Things (IoT) devices, and / or can be implemented as NB-IoT (narrowband

[0042] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a particular RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, etc. A frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency can support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0043] In some examples, access to an air interface can be scheduled, where a scheduling entity (e.g., a base station) allocates resources for communication among some or all of the devices and equipment within its service area or cell. Within the present disclosure, as further discussed below, a scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, a subordinate entity utilizes resources allocated by the scheduling entity.

[0044] A base station is not the only entity that can function as a scheduling entity. That is, in some examples, a UE can function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs). In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication. A UE can function as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh networking example, UEs can optionally communicate directly with one another in addition to communicating with the scheduling entity.

[0045] Thus, in a wireless communication network with scheduled access to time- frequency resources and having a cellular configuration, a P2P configuration, and a mesh configuration, a scheduling entity and one or more subordinate entities can utilize scheduled resources for communication.

[0046] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with one another). For example, UEs 120 can communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which can include vehicle-to- vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), a mesh network, and / or the like. In this case, UEs 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0047] As indicated above, Figure 1 are provided merely by way of example. Other examples can differ from what is described Figure 1 with respect to the examples described.

[0048] Figure 2 A block diagram of a design 200 of base station 110 and UE 120 is shown, which can be one of the base stations and one of the UEs in Figure 1 FIG. 1. Base station 110 can be equipped with T antennas 234a through 234t, and UE 120 can be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.

[0049] At base station 110, a transmit processor 220 can receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmit processor 220 can 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. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and can provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t can be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in more detail below, location encoding can be utilized to generate the synchronization signals to convey additional information.

[0050] At the UE 120, the antennas 252a through 252r can receive the downlink signals from the base station 110 and / or other base stations and can provide received signals to the demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor can determine 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 of UE 120 can be included in a housing.

[0051] On the uplink, at the UE 120, a transmit processor 264 can receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.) from the controller / processor 280. Transmit processor 264 can also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 can be precoded by a 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 UE 120 and other UEs can be received by the antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. The receive processor 238 can provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. The base station 110 can include a communication unit 244 and communicate to the network controller 130 via the communication unit 244. The network controller 130 can include a communication unit 294, a controller / processor 290, and a memory 292.

[0052] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component may perform one or more techniques associated with transmitting multi-slot aperiodic probe reference signals, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 6 Process 600 Figure 7 The operation of process 700, and / or other processes as described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. Scheduler 246 may schedule the UE for data transmission on downlink and / or uplink.

[0053] The stored program code, when executed by processor 280 and / or other processors and modules at UE 120, enables UE 120 to perform actions related to... Figure 6 The process 600 and / or other processes described herein. The stored program code, when executed by the processor 240 and / or other processors and modules at base station 110, enables base station 110 to perform operations related to... Figure 7 The process 700 and / or other processes described herein. Scheduler 246 can schedule the UE for data transmission on the downlink and / or uplink.

[0054] In some aspects, UE 120 may include: means for receiving a probe reference signal (SRS) configuration from a base station (BS), the SRS configuration indicating a plurality of candidate time slots for transmitting a multi-slot aperiodic SRS (A-SRS); means for receiving an SRS trigger from the BS, the SRS trigger including an indication of an aperiodic SRS (A-SRS) resource set, the A-SRS resource set including a plurality of A-SRS resources corresponding to the plurality of candidate time slots; means for transmitting the multi-slot A-SRS in one or more of the plurality of candidate time slots using at least a portion of the A-SRS resource set in response to the SRS trigger; and so on. In some aspects, such means may include combinations of Figure 2 One or more components of the described UE 120.

[0055] In some aspects, base station 110 may include: means for transmitting an SRS configuration to a UE, the SRS configuration indicating a plurality of candidate time slots for transmitting multi-slot A-SRS; means for transmitting an SRS trigger to the UE, the SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including a plurality of A-SRS resources corresponding to the plurality of candidate time slots; means for receiving the multi-slot A-SRS in response to the SRS trigger, the multi-slot A-SRS being transmitted using at least a portion of the A-SRS resource set in one or more of the plurality of candidate time slots; and so on. In some aspects, such means may include a combination of Figure 2 One or more components of the described base station 110.

[0056] although Figure 2 The boxes in the diagram are interpreted as different components, but the functions described above with respect to these boxes can be implemented by a single hardware component, software component, or combination of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by processor 280 or under the control of processor 280.

[0057] As indicated above, Figure 2 This is provided merely as an example. Other examples may differ from those provided. Figure 2 The example described.

[0058] Figure 3 This is a diagram illustrating Example 300 of transmitting an aperiodic probe reference signal (A-SRS) according to various aspects of this disclosure.

[0059] To estimate the uplink (UL) channel, the UE (e.g., Figure 1 The UE 120 shown can transmit a probe reference signal (SRS). Base station 110 can configure one or more SRS resource sets for UE 120 to allocate resources for SRS transmission by UE 120. For example, the configuration for the SRS resource set can be indicated in Radio Resource Control (RRC) messages (e.g., RRC configuration messages, and RRC reconfiguration messages, etc.). As shown by reference numeral 305, an SRS resource set may include one or more resources (e.g., shown as SRS resource AE), which may include time resources and / or frequency resources (e.g., time slots, symbols, resource blocks, periodicity of time resources, etc.).

[0060] In some aspects, a SRS resource can include one or more antenna ports (e.g., in a time-frequency resource) on which a SRS is to be transmitted. As such, a configuration for a set of SRS resources can indicate one or more time-frequency resources in which a SRS is to be transmitted, and can indicate one or more antenna ports in those time-frequency resources on which a SRS is to be transmitted. In some aspects, a configuration for a set of SRS resources can indicate a use case for the set of SRS resources (e.g., in a SRS-SetUse information element). For example, a set of SRS resources can have an antenna switching, codebook, non-codebook, beam management, and / or the like use case.

[0061] An antenna switching set of SRS resources can be used to indicate downlink channel state information (CSI) with reciprocity between an uplink channel and a downlink channel. For example, when reciprocity exists between an uplink channel and a downlink channel, a base station 110 can use antenna switching SRS (e.g., SRS transmitted using resources in an antenna switching set of SRS resources) to capture downlink CSI (e.g., to determine a downlink precoder to be used to communicate with a UE 120).

[0062] A codebook set of SRS resources can be used to indicate uplink CSI when a base station 110 indicates an uplink precoder to a UE 120. For example, when a base station 110 is configured to indicate an uplink precoder to a UE 120 (e.g., using a precoder codebook), the base station 110 can use codebook SRS (e.g., SRS transmitted using resources in a codebook set of SRS resources) to capture uplink CSI (e.g., to determine an uplink precoder to indicate to the UE and to use by the UE 120 to communicate with the base station 110).

[0063] A non-codebook set of SRS resources can be used to indicate uplink CSI when a UE 120 selects an uplink precoder (e.g., rather than the base station 110 indicating an uplink precoder to be used by the UE 120). For example, when a UE 120 is configured to select an uplink precoder, a base station 110 can use non-codebook SRS (e.g., SRS transmitted using resources in a non-codebook set of SRS resources) to capture uplink CSI. In this case, the non-codebook SRS can be precoded using a precoder selected by the UE 120 (e.g., can indicate the precoder to the base station 110).

[0064] A beam management set of SRS resources can be used to indicate CSI for millimeter wave communications.

[0065] SRS resource set transmissions can be aperiodic, semi-persistent, or periodic. As shown by reference number 310, an SRS trigger can be carried in downlink control information (DCI) and can be used to trigger transmission of an A-SRS in a slot 315. NR supports an NR SRS resource that can occupy 1, 2, or 4 contiguous symbols in time domain, with up to 4 ports per SRS resource. As shown by reference number 320, an SRS can be transmitted only in the last 6 symbols of slot 315, after a slot offset 325. Additionally, under existing specifications, an SRS can be transmitted only after PUSCH in the slot.

[0066] Current NR specifications support transmission of an A-SRS in only one slot after a trigger. As such, a base station can trigger an A-SRS multiple times to evaluate uplink channels associated with different antennas, different UEs, different channels, different aggregated carriers, and / or the like. Additionally, under current specifications, slot offset is the only A-SRS parameter that can be dynamically configured.

[0067] In some aspects, the techniques described herein can enable a base station to configure a number of candidate slots for transmitting an A-SRS and trigger the A-SRS for transmission in one or more of the number of candidate slots (referred to herein as “multi-slot A-SRS”). In some aspects, the number of candidate slots can be greater than one. In some aspects, the techniques described herein for triggering a multi-slot A-SRS using a single DCI transmission can facilitate enhanced SRS usefulness without increasing overhead. In some aspects, the base station can be able to dynamically configure a duration of A-SRS transmission, a periodicity of A-SRS transmission, and selection of SRS resources from an SRS resource set to be transmitted. Some aspects of this increased functionality can facilitate more efficient evaluation and scheduling of uplink channels, thereby improving uplink reliability, quality of service, and / or the like.

[0068] As indicated above, Figure 3 are provided merely as examples. Other examples can differ from what is described with respect to at least one of the Figure 3 described examples.

[0069] Figure 4 FIG. 4 is a diagram illustrating an example 400 of transmitting a multi-slot A-SRS, in accordance with various aspects of the present disclosure. As shown, a base station 110 and a UE 120 can communicate with one another.

[0070] As shown by reference number 405, the base station 110 can transmit, and the UE 120 can receive, an SRS configuration. The SRS configuration can indicate a number of candidate slots for transmitting a multi-slot A-SRS. The SRS configuration can include one or more configuration indications that, for example, indicate a number of the plurality of candidate slots to use for transmitting the multi-slot A-SRS. The term multi-slot A-SRS refers to an A-SRS for which multiple slots are configured, although in some aspects the multi-slot A-SRS can be transmitted in only one of the plurality of candidate slots.

[0071] For example, in some aspects, the SRS configuration can include an indication to attempt to transmit the A-SRS in a first slot of the plurality of candidate slots, and if that attempt is unsuccessful, to attempt to transmit the A-SRS in a second slot of the plurality of candidate slots. In some aspects, the first slot and the second slot can be adjacent to each other. In some aspects, the second slot can be separated in time from the first slot by one or more slots. In some aspects, the SRS configuration can include an indication to transmit the A-SRS in a first available slot of the plurality of candidate slots, to transmit the A-SRS in a number of slots of the plurality of candidate slots, and / or the like.

[0072] As shown by reference number 405, the base station 110 can transmit, and the UE 120 can receive, one or more configuration indications that indicate one or more parameters. In some aspects, the one or more parameters can include an A-SRS duration indication that indicates a specified number of slots to use for transmitting the multi-slot A-SRS. In some aspects, the one or more parameters can include a maximum duration indication that indicates a maximum number of consecutive slots that can be used to transmit the multi-slot A-SRS. In some aspects, the one or more parameters can include a periodicity indication that indicates a periodicity of slots to use for transmitting the multi-slot A-SRS.

[0073] In some aspects, the one or more parameters can include a default number of slots of the plurality of candidate slots in which to transmit the A-SRS. For example, in some aspects, the configuration indication can indicate the default number of slots to be equal to one. In this case, the UE 120 can be configured to attempt to transmit the A-SRS in a first slot of the plurality of candidate slots, and if that attempt is unsuccessful, to attempt to transmit the A-SRS in a second slot of the plurality of candidate slots. If the second attempt is unsuccessful, the UE 120 can be configured to attempt to transmit the A-SRS in a third slot of the plurality of candidate slots, and so on. Upon determining that the UE 120 has successfully transmitted the A-SRS, the default configuration of one transmission can include an indication for the UE 120 to refrain from further attempts to transmit the A-SRS.

[0074] In some aspects, the one or more configuration indications can be carried in a radio resource control message, a medium access control (MAC) control element, or DCI. In some aspects, the one or more configuration indications can be preconfigured, thereby reducing configuration overhead.

[0075] As shown by reference number 410, the base station 110 can transmit, and the UE 120 can receive, an SRS trigger. The trigger can include an indication of a set of A-SRS resources. The set of SRS resources can include a plurality of A-SRS resources. In some aspects, the SRS trigger can be carried in DCI.

[0076] As shown by reference number 415, the UE 120 can transmit, and the base station 110 can receive, a multi-slot A-SRS in one or more of a plurality of candidate slots. The multi-slot A-SRS can be transmitted in response to the SRS trigger and can be transmitted based at least in part on at least a portion of the set of A-SRS resources. In some aspects, transmitting the multi-slot A-SRS in one or more of the plurality of candidate slots can be based at least in part on the set of A-SRS resources (e.g., including all SRS resources in the set of A-SRS resources). In some aspects, transmitting the multi-slot A-SRS can include using a subset of the plurality of A-SRS resources.

[0077] In some aspects, the UE 120 can transmit the multi-slot A-SRS in accordance with a priority associated with the multi-slot A-SRS. The priority associated with the multi-slot A-SRS can be lower or higher relative to any number of other priorities associated with transmissions. In some aspects, the priority associated with the multi-slot A-SRS can be lower relative to a priority associated with a single-slot A-SRS. Examples of additional priority options are depicted in Table 1 below and described in further detail below in connection with Figure 6 and 7 In Table 1, the lower portion corresponds to carrier aggregation (CA) communications, and the upper portion corresponds to non-CA communications. In some aspects, multi-slot A-SRS can not be enabled for CA-based communications.

[0078]

[0079]

[0080]

[0081] Table 1

[0082] In some aspects, the techniques described herein can enable a base station to trigger A-SRS for transmission over more than one slot (referred to herein as “multi-slot A-SRS”). In some aspects, the techniques described herein for triggering multi-slot A-SRS using a single DCI transmission can facilitate enhanced SRS usefulness without increasing overhead.

[0083] As indicated above, Figure 4 are provided merely for purposes of example and illustration. Other examples can differ from Figure 4 the examples described herein.

[0084] Figure 5 FIG. 5 is a diagram illustrating an example 500 of transmitting multi-slot aperiodic sounding reference signals, in accordance with various aspects of the present disclosure. As shown, a base station 110 and a UE 120 can communicate with one another.

[0085] As shown by reference number 505, the base station 110 can transmit, and the UE 120 can receive, one or more configuration indications indicating one or more parameters. In some aspects, the one or more parameters can include an A-SRS duration indication indicating a designated number of slots to be used for transmitting multi-slot A-SRS. In some aspects, the one or more parameters can include a maximum duration indication indicating a maximum number of consecutive slots that can be used for transmitting multi-slot A-SRS. In some aspects, the one or more parameters can include a periodicity indication indicating a periodicity of slots to be used for transmitting multi-slot A-SRS.

[0086] In some aspects, the one or more configuration indications can be carried in a radio resource control message, a medium access control (MAC) control element, or a DCI. In some aspects, one or more indications can be preconfigured, thereby reducing configuration overhead.

[0087] As shown by reference number 510, the base station 110 can transmit, and the UE 120 can receive, an SRS trigger. The trigger can include an indication of a set of A-SRS resources (which can include multiple A-SRS resources). As shown by reference number 515, the UE 120 can transmit, and the base station 110 can receive, multi-slot A-SRS. As shown, the A-SRS can be transmitted in one or more of a plurality of candidate slots using at least a portion of the set of A-SRS resources. As further shown, the plurality of candidate slots in which the A-SRS is transmitted can be based at least in part on the one or more parameters discussed above. For example, if only a duration is configured, the A-SRS can be transmitted in all slots indicated by the duration, while if only a slot periodicity is configured, the A-SRS can be transmitted in a predefined number of candidate slots.

[0088] As shown by reference number 520, in some aspects, a duration parameter can be used to configure a total number of three candidate slots (with each considered to be "one slot") for transmitting A-SRS, while a periodicity parameter can indicate that A-SRS is to be transmitted every other slot. As shown by reference number 525, a maximum duration parameter can indicate a maximum number of three slots, while a periodicity can indicate that A-SRS is to be transmitted every other slot, resulting in a total of two slots carrying A-SRS.

[0089] In some aspects, a base station can be capable of dynamically configuring a duration of A-SRS transmissions, a periodicity of A-SRS transmissions, and selection of SRS resources from a set of SRS resources to transmit. Some aspects of this increased functionality can facilitate more efficient evaluation and scheduling of uplink channels, improving uplink reliability, quality of service, and the like.

[0090] As indicated above, Figure 5 are provided by way of example only. Other examples can differ from what is described Figure 5 without departing from the spirit of the disclosure.

[0091] Figure 6 is a diagram illustrating an example process 600 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 600 is an example where the UE (e.g., UE 120 and / or the like) performs operations associated with transmitting multi-slot A-SRS.

[0092] As Figure 6 shown in FIG. 15, in some aspects, process 600 can include receiving, from a BS, an SRS configuration indicating a number of candidate slots for transmission of multi-slot A-SRS (block 610). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, and / or the like) can receive an SRS configuration indicating a number of candidate slots for transmission of multi-slot A-SRS, as described above.

[0093] As Figure 6 further shown in FIG. 15, in some aspects, process 600 can include receiving, from the BS, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots (block 620). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, and / or the like) can receive, from the BS, an SRS trigger including an indication of a set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots, as described above.

[0094] As Figure 6As further described below, in some aspects, process 600 can include transmitting the multi-slot A-SRS in one or more of the plurality of candidate slots using at least a portion of the A-SRS resource set in response to the SRS trigger (block 630). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, and / or the like) can transmit the multi-slot A-SRS in one or more of the plurality of candidate slots using at least a portion of the A-SRS resource set in response to the SRS trigger, as described above.

[0095] Process 600 can include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0096] In a first aspect, the SRS trigger is carried in a DCI.

[0097] In a second aspect, alone or in combination with the first aspect, transmitting the multi-slot A-SRS in the plurality of slots is based at least in part on a set of A-SRS resources.

[0098] In a third aspect, alone or in combination with one or more of the first and second aspects, transmitting the multi-slot A-SRS includes transmitting the multi-slot A-SRS in the plurality of slots using a subset of the plurality of A-SRS resources.

[0099] In a fourth aspect, alone or in combination with one or more of the first through third aspects, a set of parameters is preconfigured, and the plurality of slots is based at least in part on one or more parameters of the set of parameters, the set of parameters including at least one of an A-SRS duration indication indicating a specified number of slots to use for transmitting the multi-slot A-SRS, a maximum duration indication indicating a maximum number of consecutive slots that can be used to transmit the multi-slot A-SRS, a periodicity indication indicating a periodicity to use for transmitting the multi-slot A-SRS, a default number of slots to use for transmitting the multi-slot A-SRS, or a combination thereof.

[0100] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process 600 includes receiving, from the BS, an A-SRS duration indication indicating a specified number of slots to use for transmitting the multi-slot A-SRS, wherein the plurality of slots includes the specified number of slots.

[0101] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the duration indication is carried in a radio resource control message, a MAC control element, or a DCI.

[0102] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 600 includes receiving, from the BS, a periodicity indication indicating a periodicity of time slots to be used for transmitting the multi-slot A-SRS, where the plurality of time slots is based at least in part on the duration indication and the periodicity indication.

[0103] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 600 includes receiving, from the BS, a maximum duration indication indicating a maximum number of consecutive time slots that can be used for transmitting the multi-slot A-SRS.

[0104] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the maximum duration indication is carried in a radio resource control message, a MAC control element, or downlink control information.

[0105] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, process 600 includes receiving, from the BS, a periodicity indication indicating a periodicity of time slots to be used for transmitting the multi-slot A-SRS, where the plurality of time slots is based at least in part on the maximum duration indication and the periodicity indication.

[0106] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 600 includes receiving, from the base station, a periodicity indication indicating a periodicity of time slots to be used for transmitting the multi-slot A-SRS.

[0107] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the periodicity indication is carried in a radio resource control message, a MAC control element, or downlink control information.

[0108] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, process 600 includes transmitting the multi-slot A-SRS in accordance with a priority associated with the multi-slot A-SRS, where the priority associated with the multi-slot A-SRS is lower relative to a priority associated with a single-slot A-SRS.

[0109] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, process 600 includes transmitting the multi-slot A-SRS according to a priority associated with the multi-slot A-SRS, where the priority associated with the multi-slot A-SRS is lower relative to a priority associated with a physical uplink control channel (PUCCH) transmission carrying a hybrid automatic repeat request acknowledgement, a priority associated with a PUCCH transmission carrying a scheduling request, a priority associated with a PUCCH transmission carrying SP channel state information (CSI), a priority associated with a PUCCH transmission carrying periodic CSI, a priority associated with a PUCCH transmission carrying SP layer 1 reference signal received power (RSRP) reporting, a priority associated with a PUCCH transmission carrying periodic layer 1 RSRP reporting, or a combination thereof.

[0110] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, process 600 includes transmitting the multi-slot A-SRS according to a priority associated with the multi-slot A-SRS, where the priority associated with the multi-slot A-SRS is higher relative to a priority associated with a semi-persistent (SP) SRS, a priority associated with a periodic SRS, a priority associated with a PUCCH transmission carrying SP CSI, a priority associated with a PUCCH transmission carrying periodic CSI, a priority associated with a PUCCH transmission carrying SP layer 1 RSRP reporting, a priority associated with a PUCCH transmission carrying periodic layer 1 RSRP reporting, or a combination thereof.

[0111] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, process 600 includes transmitting the multi-slot A-SRS according to a priority associated with the multi-slot A-SRS using carrier aggregation, where the priority associated with the multi-slot A-SRS is lower relative to a priority associated with a physical uplink shared channel (PUSCH) transmission carrying a hybrid automatic repeat request acknowledgement, a priority associated with a PUSCH transmission carrying a positive scheduling request (SR), a priority associated with a PUSCH transmission carrying a rank indicator (RI), a priority associated with a PUSCH transmission carrying a channel state information reference signal resource indicator (CRI), a priority associated with a PUSCH transmission carrying aperiodic CSI, a priority associated with a PUCCH transmission carrying a positive SR, a priority associated with a PUCCH transmission carrying an RI, a priority associated with a PUCCH transmission carrying a CRI, a priority associated with a physical random access channel transmission, or a combination thereof.

[0112] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, process 600 includes transmitting the multi-slot A-SRS using carrier aggregation and in accordance with a priority associated with the multi-slot A-SRS, where the priority associated with the multi-slot A-SRS is higher relative to a priority associated with a PUSCH transmission carrying periodic CSI with only a channel quality indicator (CQI), a priority associated with a PUSCH transmission carrying periodic CSI with only a precoding matrix indicator (PMI), a priority associated with a PUSCH transmission carrying aperiodic CSI, a priority associated with a PUSCH transmission carrying aperiodic CSI with only a CQI, a priority associated with a PUSCH transmission carrying aperiodic CSI with only a PMI, a priority associated with a PUCCH transmission carrying periodic CSI with only a CQI, a priority associated with a PUCCH transmission carrying periodic CSI with only a PMI, SRS transmission on a serving cell that is different from a serving cell on which the multi-slot A-SRS is transmitted, or a combination thereof.

[0113] Although Figure 6 Example blocks of the process 600 are illustrated, but in some aspects, the process 600 can include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Figure 6 Additionally or alternatively, two or more of the blocks of the process 600 can be performed in parallel.

[0114] Figure 7 FIG. 7 is a diagram illustrating an example process 700 performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process 700 is an example where a BS (e.g., BS 110 and / or the like) performs operations associated with transmitting multi-slot A-SRS.

[0115] As Figure 7 In some aspects, the process 700 can include transmitting, to a UE, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS (block 710), as described in FIG. 7. For example, the BS (e.g., using transmit processor 220, controller / processor 240, memory 242, and / or the like) can transmit, to a UE, an SRS configuration indicating a number of candidate slots for transmission of a multi-slot A-SRS, as described above.

[0116] As Figure 7As shown in FIG. 7, in some aspects, process 700 can include transmitting, to the UE, an SRS trigger including an indication of a set of A-SRS resources, the set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots (block 720). For example, the BS (e.g., using transmit processor 220, controller / processor 240, memory 242, and / or the like) can transmit, to the UE, an SRS trigger including an indication of a set of A-SRS resources, the set of A-SRS resources including a plurality of A-SRS resources corresponding to the number of candidate slots, as described above.

[0117] As Figure 7 As further shown in FIG. 7, in some aspects, process 700 can include receiving, in response to the SRS trigger, the multi-slot A-SRS transmitted in one or more of the plurality of candidate slots using at least a portion of the set of A-SRS resources (block 730). For example, the BS (e.g., using receive processor 238, controller / processor 240, memory 242, and / or the like) can receive, in response to the SRS trigger, the multi-slot A-SRS transmitted in one or more of the plurality of candidate slots using at least a portion of the set of A-SRS resources, as described above.

[0118] Process 700 can include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0119] In a first aspect, the SRS trigger is carried in downlink control information.

[0120] In a second aspect, alone or in combination with the first aspect, the multi-slot A-SRS transmitted in one or more of the plurality of slots is based at least in part on the set of A-SRS resources.

[0121] In a third aspect, alone or in combination with one or more of the first and second aspects, the multi-slot A-SRS is transmitted in the plurality of slots using a subset of the plurality of A-SRS resources.

[0122] In a fourth aspect, alone or in combination with one or more of the first through third aspects, a set of parameters is preconfigured, and the plurality of slots is based at least in part on one or more parameters of the set of parameters, the set of parameters including at least one of an A-SRS duration indication indicating a designated number of slots to use for transmission of the multi-slot A-SRS, a maximum duration indication indicating a maximum number of consecutive slots that can be used to transmit the multi-slot A-SRS, a periodicity indication indicating a periodicity of slots to use for transmission of the multi-slot A-SRS, a default number of slots to use for transmission of the multi-slot A-SRS, or a combination thereof.

[0123] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the process 700 includes transmitting, to the UE, an A-SRS duration indication indicating a designated number of slots to be used for transmission of the multi-slot A-SRS, where the plurality of slots includes the designated number of slots.

[0124] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the duration indication is carried in a radio resource control message, a MAC control element, or downlink control information.

[0125] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 700 includes transmitting, to the UE, a periodicity indication indicating a slot periodicity to be used for transmission of the multi-slot A-SRS, where the plurality of slots is based at least in part on the duration indication and the periodicity indication.

[0126] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the process 700 includes transmitting, to the UE, a maximum duration indication indicating a maximum number of consecutive slots that can be used for transmission of the multi-slot A-SRS.

[0127] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the maximum duration indication is carried in a radio resource control message, a MAC control element, or downlink control information.

[0128] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the process 700 includes transmitting, to the UE, a periodicity indication indicating a slot periodicity to be used for transmission of the multi-slot A-SRS, where the plurality of slots is based at least in part on the maximum duration indication and the periodicity indication.

[0129] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 700 includes transmitting, to the UE, a periodicity indication indicating a slot periodicity to be used for transmission of the multi-slot A-SRS.

[0130] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the periodicity indication is carried in a radio resource control message, a MAC control element, or downlink control information.

[0131] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS, and the priority associated with the multi-slot A-SRS is lower relative to a priority associated with a single-slot A-SRS.

[0132] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS that is lower relative to a priority associated with a PUCCH transmission carrying a hybrid automatic repeat request acknowledgement, a priority associated with a PUCCH transmission carrying a scheduling request, a priority associated with a PUCCH transmission carrying SP CSI, a priority associated with a PUCCH transmission carrying periodic CSI, a priority associated with a PUCCH transmission carrying SP layer 1 RSRP reporting, a priority associated with a PUCCH transmission carrying periodic layer 1 RSRP reporting, or a combination thereof.

[0133] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS that is higher relative to a priority associated with an SP SRS, a priority associated with a periodic SRS, a priority associated with a PUCCH transmission carrying SP CSI, a priority associated with a PUCCH transmission carrying periodic CSI, a priority associated with a PUCCH transmission carrying SP layer 1 RSRP reporting, a priority associated with a PUCCH transmission carrying periodic layer 1 RSRP reporting, or a combination thereof.

[0134] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with the multi-slot A-SRS that is lower relative to a priority associated with a PUSCH transmission carrying a hybrid automatic repeat request acknowledgement, a priority associated with a PUSCH transmission carrying a positive SR, a priority associated with a PUSCH transmission carrying an RI, a priority associated with a PUSCH transmission carrying a CRI, a priority associated with a PUSCH transmission carrying aperiodic CSI, a priority associated with a PUCCH transmission carrying a positive SR, a priority associated with a PUCCH transmission carrying an RI, a priority associated with a PUCCH transmission carrying a CRI, a priority associated with a physical random access channel transmission, or a combination thereof.

[0135] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with the multi-slot A-SRS that is higher relative to a priority associated with a PUSCH transmission carrying periodic CSI with only CQI, a priority associated with a PUSCH transmission carrying periodic CSI with only PMI, a priority associated with a PUSCH transmission carrying aperiodic CSI, a priority associated with a PUSCH transmission carrying aperiodic CSI with only CQI, a priority associated with a PUSCH transmission carrying aperiodic CSI with only PMI, a priority associated with a PUCCH transmission carrying periodic CSI with only CQI, a priority associated with a PUCCH transmission carrying periodic CSI with only PMI, SRS transmission on a serving cell that is different from a serving cell on which the multi-slot A-SRS is transmitted, or a combination thereof.

[0136] Although Figure 7 Example blocks of the process 700 are illustrated, but in some aspects, the process 700 can include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the figure. Additionally, or alternatively, two or more of the blocks of the process 700 can be performed concurrently. Figure 7

[0137] The foregoing disclosure provides explanation and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations can be made in light of the above disclosure or can be acquired from practice of the aspects.

[0138] As used herein, the term “component” is intended to be broadly interpreted to include hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software.

[0139] As used herein, depending on the context, satisfying a threshold can refer to a value being 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, and / or the like.

[0140] It will be apparent to those skilled in the art that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods were 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 based, at least in part, on the description herein.​

[0141] Although 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 various aspects. In fact, many of these features can be combined in ways not specifically recited in the claims and / or disclosed in the specification. Although each dependent claim listed below can stand on its own as a separate embodiment, the disclosure of the aspects can include each dependent claim in combination with every other claim in the group. A phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an 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 multiples of the same element (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).

[0142] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and can be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and / or the like), and can be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

Claims

1. A method for performing wireless communication by a user equipment (UE), comprising: Receive a probe reference signal (SRS) configuration from a network entity, the SRS configuration indicating several candidate time slots for transmitting multi-slot aperiodic SRS (A-SRS); A first SRS trigger is received from the network entity, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as In response to the first SRS trigger, at least a portion of the A-SRS resource set is used to transmit the multi-slot A-SRS in multiple time slots.

2. The method as described in claim 1, wherein, The first SRS trigger is carried in the downlink control information.

3. The method as described in claim 1, wherein, The transmission of the multi-slot A-SRS in the plurality of time slots is at least partially based on the A-SRS resource set.

4. The method of claim 1, wherein, Transmitting the multi-slot A-SRS includes: using a subset of the multiple A-SRS resources to transmit the multi-slot A-SRS in the multiple time slots.

5. The method of claim 1, wherein, A parameter set is pre-configured, and wherein the plurality of time slots are at least partially based on one or more parameters in the parameter set, the parameter set including at least one of the following: An A-SRS duration indication indicating the number of specified time slots to be used for transmitting the multi-slot A-SRS. The indicator is a maximum duration indicator that can be used to transmit the maximum number of consecutive time slots of the multi-time slot A-SRS. The indication is a periodic indication of the time slot periodicity to be used for transmitting the multi-time-slot A-SRS. The default number of time slots to be used for transmitting the multi-time slot A-SRS, or Its combination.

6. The method of claim 1, further comprising: Receive from the network entity an A-SRS duration indication indicating a specified number of time slots to be used for transmitting the multi-slot A-SRS, wherein the multiple time slots include the specified number of time slots.

7. The method of claim 6, wherein, The A-SRS duration indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

8. The method of claim 6, further comprising: Receive from the network entity a periodic indication of the time slot periodicity for transmitting the multi-slot A-SRS, wherein the multiple time slots are at least partially based on the A-SRS duration indication and the periodic indication.

9. The method of claim 1, further comprising: Receive from the network entity a maximum duration indication indicating the maximum number of consecutive time slots that can be used to transmit the multi-slot A-SRS.

10. The method of claim 9, wherein, The maximum duration indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

11. The method of claim 9, further comprising: Receive from the network entity a periodic indication of the time slot periodicity for transmitting the multi-slot A-SRS, wherein the multiple time slots are at least partially based on the maximum duration indication and the periodic indication.

12. The method of claim 1, further comprising: Receive from the network entity a periodic indication of the time slot periodicity to be used for transmitting the multi-slot A-SRS.

13. The method of claim 11, wherein, The periodic indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

14. The method of claim 1, further comprising: The multi-slot A-SRS is transmitted according to a priority associated with it, wherein the priority associated with the multi-slot A-SRS is lower than the priority associated with the single-slot A-SRS.

15. The method of claim 1, further comprising: The multi-slot A-SRS is transmitted according to the priority associated with it, wherein the priority associated with the multi-slot A-SRS is lower than the following: The priority associated with Physical Uplink Control Channel (PUCCH) transmissions carrying Hybrid Automatic Repeat Request Acknowledgment (HACCP). The priority associated with the PUCCH transmission carrying the scheduling request. The priority associated with PUCCH transmissions carrying SP channel state information (CSI). Priority associated with PUCCH transmissions carrying periodic CSI. The priority associated with PUCCH transmissions carrying SP layer 1 reference signals and receiving power RSRP reports. The priority associated with PUCCH transmissions carrying periodic Layer 1 RSRP reports, or Its combination.

16. The method of claim 1, further comprising: The multi-slot A-SRS is transmitted according to the priority associated with it, wherein the priority associated with the multi-slot A-SRS is higher than the following: Priorities associated with semi-persistent SP SRS Priorities associated with periodic SRS The priority associated with the transmission of the Physical Uplink Control Channel (PUCCH) carrying Channel Status Information (CSI). Priority associated with PUCCH transmissions carrying periodic CSI. The priority associated with PUCCH transmissions carrying SP layer 1 reference signals and receiving power RSRP reports. The priority associated with PUCCH transmissions carrying periodic Layer 1 RSRP reports, or Its combination.

17. The method of claim 1, further comprising: The multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with it, wherein the priority associated with the multi-slot A-SRS is lower than the following: Priority associated with Physical Uplink Shared Channel (PUSCH) transmissions carrying Hybrid Automatic Repeat Request Acknowledgment (HQRE). The priority associated with a PUSCH transport carrying a positive scheduling request (SR). The priority associated with a PUSCH transfer carrying the rank indicator RI. The priority associated with PUSCH transmissions carrying Channel State Information Reference Signal Resource Indicator (CRI). The priority associated with PUSCH transmissions carrying aperiodic CSI. Priority associated with physical uplink control channel (PUCCH) transmissions carrying positive SR (Signal Rate). Priority associated with PUCCH transmissions carrying RI Priority associated with PUCCH transmissions carrying CRI The priority associated with physical random access channel transmission, or Its combination.

18. The method of claim 1, further comprising: The multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with it, wherein the priority associated with the multi-slot A-SRS is higher than the following: Priority associated with Physical Uplink Shared Channel (PUSCH) transmissions carrying periodic Channel State Information (CSI) consisting only of Channel Quality Indicator (CQI). The priority associated with PUSCH transmissions carrying periodic CSIs containing only the precoded matrix indicator PMI. The priority associated with PUSCH transmissions carrying aperiodic CSI. The priority associated with PUSCH transmissions carrying only aperiodic CSI with CQI, The priority associated with PUSCH transmissions carrying only aperiodic CSI with PMI is... The priority associated with physical uplink control channel (PUCCH) transmissions carrying periodic CSIs with only CQI. Priority associated with PUCCH transmissions carrying periodic CSIs with only PMI. SRS transmission on a different serving cell than the serving cell on which the multi-slot A-SRS is transmitted, configured for PUSCH and PUCCH transmission, or Its combination.

19. A method for performing wireless communication by a network entity, comprising: Transmit a probe reference signal (SRS) configuration to the user equipment (UE), the SRS configuration indicating several candidate time slots for transmitting multi-slot aperiodic SRS (A-SRS); A first SRS trigger is transmitted to the UE, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as The multi-slot A-SRS is received in response to the first SRS triggering, the multi-slot A-SRS being transmitted in multiple time slots using at least a portion of the A-SRS resource set.

20. The method of claim 19, wherein, The first SRS trigger is carried in the downlink control information.

21. The method of claim 19, wherein, The multi-slot A-SRS transmitted in the plurality of time slots is at least partially based on the A-SRS resource set.

22. The method of claim 19, wherein, The multi-slot A-SRS is transmitted in the multiple time slots using a subset of the multiple A-SRS resources.

23. The method of claim 19, wherein, A parameter set is pre-configured, and wherein the plurality of time slots are at least partially based on one or more parameters in the parameter set, the parameter set including at least one of the following: An A-SRS duration indication indicating the number of specified time slots to be used for transmitting the multi-slot A-SRS. The indicator is a maximum duration indicator that can be used to transmit the maximum number of consecutive time slots of the multi-time slot A-SRS. The indication is a periodic indication of the time slot periodicity to be used for transmitting the multi-time-slot A-SRS. The default number of time slots to be used for transmitting the multi-time slot A-SRS, or Its combination.

24. The method of claim 19, further comprising: The UE is transmitted an A-SRS duration indication indicating a specified number of time slots to be used for transmitting the multi-slot A-SRS, wherein the multiple time slots include the specified number of time slots.

25. The method of claim 24, wherein, The A-SRS duration indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

26. The method of claim 24, further comprising: The UE is transmitted a periodic indication indicating the time slot periodicity for transmitting the multi-slot A-SRS, wherein the multiple time slots are at least partially based on the A-SRS duration indication and the periodic indication.

27. The method of claim 19, further comprising: The maximum duration indication is transmitted to the UE, indicating the maximum number of consecutive time slots that can be used to transmit the multi-slot A-SRS.

28. The method of claim 27, wherein, The maximum duration indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

29. The method of claim 27, further comprising: The UE is transmitted a periodic indication indicating the time slot periodicity for transmitting the multi-slot A-SRS, wherein the multiple time slots are at least partially based on the maximum duration indication and the periodic indication.

30. The method of claim 19, further comprising: A periodic indication is transmitted to the UE to indicate the time slot periodicity for transmitting the multi-slot A-SRS.

31. The method of claim 30, wherein, The periodic indication is carried in radio resource control messages, media access control (MAC) control elements, or downlink control information.

32. The method of claim 19, wherein, The multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS, wherein the priority associated with the multi-slot A-SRS is lower than the priority associated with the single-slot A-SRS.

33. The method of claim 19, wherein, The multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS, wherein the priority associated with the multi-slot A-SRS is lower than the following: The priority associated with Physical Uplink Control Channel (PUCCH) transmissions carrying Hybrid Automatic Repeat Request Acknowledgment (HACCP). The priority associated with the PUCCH transmission carrying the scheduling request. The priority associated with PUCCH transmissions carrying SP channel state information (CSI). Priority associated with PUCCH transmissions carrying periodic CSI. The priority associated with PUCCH transmissions carrying SP layer 1 reference signals and receiving power RSRP reports. The priority associated with PUCCH transmissions carrying periodic Layer 1 RSRP reports, or Its combination.

34. The method of claim 19, wherein, The multi-slot A-SRS is transmitted according to a priority associated with the multi-slot A-SRS, wherein the priority associated with the multi-slot A-SRS is higher than the following: Priorities associated with semi-persistent SP SRS Priorities associated with periodic SRS The priority associated with the transmission of the Physical Uplink Control Channel (PUCCH) carrying Channel Status Information (CSI). Priority associated with PUCCH transmissions carrying periodic CSI. The priority associated with PUCCH transmissions carrying SP layer 1 reference signals and receiving power RSRP reports. The priority associated with PUCCH transmissions carrying periodic Layer 1 RSRP reports, or Its combination.

35. The method of claim 19, wherein, The multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with the multi-slot A-SRS, wherein the priority associated with the multi-slot A-SRS is lower than the following: Priority associated with Physical Uplink Shared Channel (PUSCH) transmissions carrying Hybrid Automatic Repeat Request Acknowledgment (HQRE). The priority associated with a PUSCH transport carrying a positive scheduling request (SR). The priority associated with a PUSCH transfer carrying the rank indicator RI. The priority associated with PUSCH transmissions carrying Channel State Information Reference Signal Resource Indicator (CRI). The priority associated with PUSCH transmissions carrying aperiodic CSI. Priority associated with physical uplink control channel (PUCCH) transmissions carrying positive SR (Signal Rate). Priority associated with PUCCH transmissions carrying RI Priority associated with PUCCH transmissions carrying CRI The priority associated with physical random access channel transmission, or Its combination.

36. The method of claim 19, wherein, The multi-slot A-SRS is transmitted using carrier aggregation and according to a priority associated with the multi-slot A-SRS, wherein the priority associated with the multi-slot A-SRS is higher than the following: Priority associated with Physical Uplink Shared Channel (PUSCH) transmissions carrying periodic Channel State Information (CSI) consisting only of Channel Quality Indicator (CQI). The priority associated with PUSCH transmissions carrying periodic CSIs containing only the precoded matrix indicator PMI. The priority associated with PUSCH transmissions carrying aperiodic CSI. The priority associated with PUSCH transmissions carrying only aperiodic CSI with CQI, The priority associated with PUSCH transmissions carrying only aperiodic CSI with PMI is... The priority associated with physical uplink control channel (PUCCH) transmissions carrying periodic CSIs with only CQI. Priority associated with PUCCH transmissions carrying periodic CSIs with only PMI. SRS transmission on a different serving cell than the serving cell on which the multi-slot A-SRS is transmitted, configured for PUSCH and PUCCH transmission, or Its combination.

37. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors are operatively coupled to the memory, and the memory and the one or more processors are configured to: Receive a probe reference signal (SRS) configuration from a network entity, the SRS configuration indicating several candidate time slots for transmitting a multi-slot aperiodic SRS (A-SRS); A first SRS trigger is received from the network entity, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as In response to the first SRS trigger, at least a portion of the A-SRS resource set is used to transmit the multi-slot A-SRS in multiple time slots.

38. The UE as claimed in claim 37, wherein, The memory and the one or more processors are further configured to perform the method as described in any one of claims 2-18.

39. A network entity for wireless communication, comprising: Memory; as well as One or more processors are operatively coupled to the memory, and the memory and the one or more processors are configured to: Transmit a probe reference signal (SRS) configuration to the user equipment (UE), the SRS configuration indicating several candidate time slots for transmitting multi-slot aperiodic SRS (A-SRS); A first SRS trigger is transmitted to the UE, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as The multi-slot A-SRS is received in response to the first SRS triggering, the multi-slot A-SRS being transmitted in multiple time slots using at least a portion of the A-SRS resource set.

40. The network entity as claimed in claim 39, wherein, The memory and the one or more processors are further configured to perform the method as described in any one of claims 20-36.

41. A non-transient computer-readable medium storing one or more instructions for wireless communication, said one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user-equipped UE, cause the one or more processors to perform the following operations: Receive a probe reference signal (SRS) configuration from a network entity, the SRS configuration indicating several candidate time slots for transmitting a multi-slot aperiodic SRS (A-SRS); A first SRS trigger is received from the network entity, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as In response to the first SRS trigger, at least a portion of the A-SRS resource set is used to transmit the multi-slot A-SRS in multiple time slots.

42. The non-transient computer-readable medium of claim 41, wherein, The one or more instructions further include: when executed by the one or more processors of the UE, causing the one or more processors to execute one or more instructions of the method as described in any one of claims 2-18.

43. A non-transient computer-readable medium storing one or more instructions for wireless communication, said one or more instructions comprising: One or more instructions that, when executed by one or more processors of a network entity, cause the one or more processors to perform the following operations: Transmit a probe reference signal (SRS) configuration to the user equipment (UE), the SRS configuration indicating several candidate time slots for transmitting multi-slot aperiodic SRS (A-SRS); A first SRS trigger is transmitted to the UE, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including multiple A-SRS resources corresponding to the plurality of candidate time slots; as well as The multi-slot A-SRS is received in response to the first SRS triggering, the multi-slot A-SRS being transmitted in multiple time slots using at least a portion of the A-SRS resource set.

44. The non-transient computer-readable medium of claim 43, wherein, The one or more instructions further include: when executed by the one or more processors of the network entity, causing the one or more processors to execute the one or more instructions of any one of claims 20-36.

45. A device for wireless communication, comprising: A means for receiving a probe reference signal (SRS) configuration from a network entity, the SRS configuration indicating several candidate time slots for transmitting a multi-slot aperiodic SRS (A-SRS). A means for receiving a first SRS trigger from the network entity, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including a plurality of A-SRS resources corresponding to the plurality of candidate time slots; as well as A means for transmitting the multi-slot A-SRS in multiple time slots using at least a portion of the A-SRS resource set in response to a first SRS trigger.

46. ​​The apparatus of claim 45, further comprising: Apparatus for performing the method as described in any one of claims 2-18.

47. A device for wireless communication, comprising: A means for transmitting a probe reference signal (SRS) configuration to a user equipment (UE), the SRS configuration indicating several candidate time slots for transmitting a multi-slot aperiodic SRS (A-SRS). A means for transmitting a first SRS trigger to the UE, the first SRS trigger including an indication of an A-SRS resource set, the A-SRS resource set including a plurality of A-SRS resources corresponding to the plurality of candidate time slots; as well as A means for receiving the multi-slot A-SRS in response to the first SRS triggering, the multi-slot A-SRS being transmitted in multiple time slots using at least a portion of the A-SRS resource set.

48. The apparatus of claim 47, further comprising: Apparatus for performing the method as described in any one of claims 20-36.

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