SRS resource configuration based on medium access control (MAC) control elements

Abstract

Various aspects of the present disclosure provide methods and apparatus for controlling sounding reference signal (SRS) resources in wireless communications using a medium access control (MAC) control element (CE). A user equipment (UE) receives a MAC CE from a network, the MAC CE including information for activating or deactivating one or more SRS resources included in at least one SRS resource set. Based on the information in the MAC CE, the UE transmits SRS communications using the one or more SRS resources included in the at least one SRS resource set.

Description

Technical Field

[0001] In general, the technology discussed below relates to wireless communication systems, and more particularly, to methods and apparatus for controlling and configuring sounding reference signals (SRS) in wireless communications. Background Art

[0002] In wireless communication systems, a sounding reference signal (SRS) can be used to characterize the wireless channel between a mobile device and a network, enabling accurate and dynamic adaptation of communication signaling based on carrier characteristics. A mobile device can send an SRS on one or more symbols on an uplink carrier. The SRS provides a measurement reference that the network can use to discover information related to uplink carrier quality. The network can then use its SRS-based measurements or calculations for any channel-dependent scheduling (e.g., frequency selective resource allocation) that it can send to a mobile device to schedule uplink transmissions. In addition, the network can use the SRS for uplink power control, time tracking, or adaptive antenna switching for transmit diversity.

[0003] In fifth-generation (5G) New Radio (NR) access networks, the format and configuration of SRS may differ from those of existing access networks. Specifically, because NR access networks may use different and / or more frequency bands than legacy access networks, may have different timing and latency requirements, and may use different transmission schemes and channel structures, the sounding procedures and SRS configurations in those earlier standards may not be appropriate. Research and development continue to advance wireless communication technologies, not only to meet the growing demand for mobile broadband access, but also to advance and enhance the user experience of mobile communications. Summary of the Invention

[0004] To provide a basic understanding of one or more aspects of the present disclosure, a brief summary of these aspects is provided below. This summary is not an exhaustive overview of all anticipated features of the present disclosure, nor is it intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a simplified form as a prelude to the detailed description presented later.

[0005] Aspects of the present disclosure provide methods and apparatus for controlling sounding reference signal (SRS) resources in wireless communications using a medium access control (MAC) control element (CE).

[0006] A first embodiment of wireless communication at a scheduled entity includes: receiving a medium access control (MAC) control element (CE) from a network, the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set; and based on the information of the MAC CE, using the one or more SRS resources included in the at least one SRS resource set to send SRS communication.

[0007] In combination with a second embodiment of the first embodiment, the MAC CE further includes an SRS slot offset field, which is configured to indicate a slot offset between triggering downlink control information (DCI) and the at least one SRS resource set activated. In combination with a third embodiment of the second embodiment, the MAC CE further includes a content field, which is configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field. In combination with a fourth embodiment of the first embodiment, the MAC CE further includes a channel state information reference signal (CSI-RS) field, which is configured to indicate a CSI-RS associated with the at least one SRS resource set.

[0008] In a fifth embodiment in combination with any one of the first to fourth embodiments, the MAC CE includes: an SRS resource set field configured to indicate an SRS resource set; and an SRS resource field configured to indicate the one or more SRS resources included in the at least one SRS resource set. In a sixth embodiment in combination with the fifth embodiment, the SRS resource field is configured to activate or deactivate the one or more SRS resources based on a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the at least one SRS resource set.

[0009] In combination with the seventh embodiment of any one of the first to fourth embodiments, the MAC CE includes: an SRS resource set bitmap including a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and an SRS resource field being configured to indicate the one or more SRS resources included in the activated SRS resource set of the at least one SRS resource set based on the SRS resource set bitmap. In combination with the eighth embodiment of the seventh embodiment, the SRS resource field is configured to activate or deactivate the one or more SRS resources according to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the activated SRS resource set.

[0010] In combination with a ninth embodiment of any one of the first to fourth embodiments, the MAC CE includes: a downlink control information (DCI) code point bitmap, which is configured to indicate one or more activated DCI code points for triggering aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, which is configured to indicate an SRS resource set in the at least one SRS resource set; and an SRS resource field, which is configured to indicate the one or more SRS resources included in the SRS resource set. In combination with a tenth embodiment of the ninth embodiment, the SRS resource field is configured to activate or deactivate the one or more SRS resources according to the one or more activated DCI code points.

[0011] In combination with the eleventh embodiment of any one of the first to fourth embodiments, the MAC CE includes: an SRS resource set field, which is configured to indicate an SRS resource set in the at least one SRS resource set; and a plurality of SRS resource triggering status fields associated with the SRS resource set, the plurality of SRS resource triggering status fields being configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling. In combination with the twelfth embodiment of the eleventh embodiment, the plurality of SRS resource triggering status fields respectively correspond to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent or periodic SRS resources included in the SRS resource set. In combination with the thirteenth embodiment of the eleventh embodiment, each of the plurality of SRS resource triggering states indicates activation or deactivation of each of the one or more SRS resources for the SRS resource set.

[0012] In combination with a fourteenth embodiment of any one of the first to fourth embodiments, the MAC CE includes: an SRS resource set field configured to indicate an SRS resource set in the at least one SRS resource set; and an SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state of the SRS resource set in a plurality of SRS triggering states pre-configured by radio resource control signaling. In combination with a fifteenth embodiment of the fourteenth embodiment, the activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the SRS resource set.

[0013] In combination with the sixteenth embodiment of any one of the first to fourth embodiments, the MAC CE comprises: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set of the at least one SRS resource set; and a plurality of SRS resource triggering status fields associated with the corresponding SRS resource set, the plurality of SRS resource triggering status fields being configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling. In combination with the seventeenth embodiment of the sixteenth embodiment, the plurality of SRS resource triggering status fields respectively correspond to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

[0014] In combination with the eighteenth embodiment of any one of the first to fourth embodiments, the MAC CE includes: an SRS resource set bitmap including a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and an SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state in a plurality of SRS triggering states pre-configured by radio resource control signaling for the corresponding SRS resource set. In combination with the nineteenth embodiment of the eighteenth embodiment, the activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

[0015] In combination with the twentieth embodiment of any one of the first to fourth embodiments, the MAC CE includes: a downlink control information (DCI) code point bitmap, which is configured to indicate one or more activated DCI code points for triggering aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, which is configured to indicate an SRS resource set in the at least one SRS resource set; and one or more SRS resource triggering status fields associated with the SRS resource set, each SRS resource triggering status field being configured to indicate a resource triggering status pre-configured by radio resource control signaling. In combination with the twenty-first embodiment of the twentieth embodiment, each of the one or more SRS resource triggering status fields corresponds to one of the activated DCI code points.

[0016] A twenty-second embodiment at a scheduled entity, comprising: receiving a medium access control (MAC) control element (CE) from a network, the MAC CE comprising: a sounding reference signal (SRS) resource set field configured to indicate an SRS resource set for SRS communication; and a channel state information reference signal (CSI-RS) field configured to indicate a CSI-RS resource for receiving a CSI-RS signal from the network. In combination with the twenty-third embodiment of the twenty-second embodiment, the CSI-RS resource is associated with the SRS resource set. In combination with the twenty-fourth embodiment of the twenty-second embodiment, the SRS resource set field is configured to indicate a periodic SRS resource set, a semi-persistent SRS resource set, or an aperiodic SRS resource set. In combination with the twenty-fifth embodiment of the twenty-second or twenty-fourth embodiment, the CSI-RS field is configured to indicate a CSI-RS from a non-zero power CSI-RS resource space.

[0017] A twenty-sixth embodiment at a scheduling entity includes: sending a medium access control (MAC) control element (CE) to a user equipment (UE), the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set; and receiving SRS communication from the UE using the one or more SRS resources included in the at least one SRS resource set based on the information in the MAC CE. In combination with the twenty-sixth embodiment, the twenty-seventh embodiment further includes an SRS slot offset field configured to indicate a slot offset between triggering downlink control information (DCI) and activating the at least one SRS resource set.

[0018] In combination with the twenty-eighth embodiment of the twenty-sixth embodiment, the MAC CE further includes a content field configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field. In combination with the twenty-ninth embodiment of the twenty-sixth embodiment, the MAC CE further includes a channel state information reference signal (CSI-RS) field configured to indicate a CSI-RS associated with the at least one SRS resource set.

[0019] A thirtieth embodiment at a scheduling entity includes: sending a medium access control (MAC) control element (CE) to a user equipment (UE), wherein the MAC CE includes: a sounding reference signal (SRS) resource set field, which is configured to indicate an SRS resource set for SRS communication, and a channel state information reference signal (CSI-RS) field, which is configured to indicate a CSI-RS resource for sending CSI-RS; and sending the CSI-RS to the UE using the CSI-RS resource.

[0020] In a thirty-first embodiment in combination with the thirtieth embodiment, the CSI-RS resource is associated with the SRS resource set. In a thirty-second embodiment in combination with the thirtieth embodiment, the SRS resource set field is configured to indicate a periodic SRS resource set, a semi-persistent SRS resource set, or an aperiodic SRS resource set. In a thirty-third embodiment in combination with the thirtieth embodiment or the thirty-second embodiment, the CSI-RS field is configured to indicate a CSI-RS from a non-zero power CSI-RS resource space.

[0021] These and other aspects of the present invention will become more fully understood after reviewing the following detailed description. Other aspects, features, and embodiments will become apparent to those of ordinary skill in the art after reviewing the following description of specific, exemplary embodiments in conjunction with the accompanying drawings. Although features are discussed with respect to certain embodiments and drawings below, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments are discussed as having certain advantageous features, one or more of these features may also be used in accordance with the various embodiments discussed herein. In a similar manner, although exemplary embodiments are discussed below as device, system, or method embodiments, it should be understood that these exemplary embodiments may be implemented with a variety of devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a wireless communication system according to some aspects of the present disclosure.

[0023] Figure 2 is a conceptual diagram of an example of a radio access network according to some aspects of the present disclosure.

[0024] Figure 3 is a block diagram illustrating a wireless communication system supporting Multiple-Input Multiple-Output (MIMO) communication.

[0025] Figure 4 is a diagram illustrating the organization of radio resources in an air interface utilizing orthogonal frequency division multiplexing (OFDM) according to some aspects of the present disclosure.

[0026] Figure 5 is a diagram showing a first design of a medium access control (MAC) control element (CE) for sounding reference signal (SRS) resource control, in accordance with some aspects of the present disclosure.

[0027] Figure 6 is a diagram showing a second design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0028] Figure 7 is a diagram showing a third design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0029] Figure 8 is a diagram showing a fourth design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0030] Figure 9 is a diagram showing a fifth design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0031] Figure 10 is a diagram showing a sixth design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0032] Figure 11 is a diagram showing a seventh design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0033] Figure 12 is a diagram showing an eighth design of a MAC CE for SRS resource control in accordance with some aspects of the present disclosure.

[0034] Figure 13 is a diagram showing a design of a MAC CE for updating aperiodic SRS resource slot offsets in accordance with some aspects of the present disclosure.

[0035] Figure 14 is a diagram showing a first design of a MAC CE for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure.

[0036] Figure 15 is a diagram showing a second design of a MAC CE for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure.

[0037] Figure 16 is a diagram showing a third design of a MAC CE for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure.

[0038] Figure 17 is a diagram showing a fourth design of a MAC CE for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure.

[0039] Figure 18 is a diagram showing a fifth design of a MAC CE for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure.

[0040] Figure 19 is a diagram showing a design of a MAC CE for updating associated channel state information reference signal (CSI-RS) information for an SRS resource set, in accordance with some aspects of the present disclosure.

[0041] Figure 20 is a block diagram conceptually illustrating an example of a hardware implementation for a scheduled entity according to some aspects of the present disclosure.

[0042] Figure 21 is a flow chart illustrating an example process for wireless communication at a scheduled entity using MAC CE according to some aspects of the present disclosure.

[0043] Figure 22 is a flow chart illustrating another example process for wireless communication at a scheduled entity using MAC CE according to some aspects of the present disclosure.

[0044] Figure 23 is a block diagram conceptually illustrating an example of a hardware implementation for a scheduling entity according to some aspects of the present disclosure.

[0045] Figure 24 is a flow chart illustrating an example process for scheduling wireless communications at an entity using MAC CE according to some aspects of the present disclosure.

[0046] Figure 25 is a flow chart illustrating another example process for scheduling wireless communications at an entity using MAC CE according to some aspects of the present disclosure. DETAILED DESCRIPTION

[0047] The detailed description of the embodiments described below in conjunction with the accompanying drawings is intended to be a description of various configurations and is not intended to represent that the concepts described herein can be practiced only in these configurations. In order to provide a thorough understanding of the various concepts, the detailed description includes specific details. However, it is obvious to those skilled in the art that these concepts can be practiced without these specific details. In some instances, to avoid obscuring these concepts, well-known structures and components are shown in block diagram form.

[0048] Although various aspects and embodiments are described in this application by way of illustration of some examples, it will be understood by those skilled in the art that additional implementations and use cases can be implemented in many different arrangements and scenarios. The innovations described herein can be implemented across multiple different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, various embodiments and / or uses can be implemented by integrated chip embodiments and other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / purchase devices, medical devices, AI-enabled devices, etc.). Although some examples may or may not be specifically targeted at use cases or applications, a variety of applicability of the described innovations may occur. The scope of implementation can range from chip-level or modular components to non-modular, non-chip-level implementations, and can also be aggregated, distributed, or OEM devices or systems that include one or more aspects of the described innovations. In some actual settings, the devices including the described aspects and features may also necessarily include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals must include multiple components for both analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / accumulators, etc.) The innovations described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, and the like, having different sizes, shapes, and configurations.

[0049] Various aspects of the present disclosure provide methods and apparatus for controlling and configuring a sounding reference signal (SRS) in wireless communications. An SRS is an uplink (UL) reference signal sent by a user equipment (UE) to a base station or a scheduling entity. Based on the SRS, the scheduling entity can determine or estimate the channel quality between the UE and the scheduling entity. Some aspects of the present disclosure provided herein are generally directed to SRS control, updating, and configuration using a medium access control (MAC) control element (CE). Some aspects of the present disclosure are generally directed to channel state information reference signal (CSI-RS) configuration using a MAC CE.

[0050] The various concepts presented throughout this disclosure may be implemented in a wide variety of telecommunication systems, network architectures, and communication standards. Figure 1 By way of illustrative example and not limitation, various aspects of the present disclosure are described with reference to a wireless communication system 100. The wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106. The wireless communication system 100 enables the UE 106 to perform data communications with an external data network 110, such as, but not limited to, the Internet.

[0051] The RAN 104 may implement any suitable wireless communication technology or techniques to provide radio access for the UE 106. For example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specifications, which are commonly referred to as 5G. For another example, the RAN 104 may operate in accordance with a hybrid of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, which are commonly referred to as LTE. 3GPP refers to this hybrid RAN as the Next Generation RAN, or NG-RAN. Of course, many other examples may be used within the scope of the present disclosure.

[0052] As shown, the RAN 104 includes a plurality of base stations 108. In a broad sense, a base station is a network element in a radio access network that is responsible for radio transmission and reception to or from UEs in one or more cells. In different technologies, standards, or contexts, a base station may be referred to variously by those of ordinary skill in the art as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a Node B (NB), an evolved Node B (eNB), a gNode B (gNB), or some other appropriate terminology.

[0053] The radio access network 104 is further shown as supporting wireless communications for multiple mobile devices. In the 3GPP standard, a mobile device may be referred to as a user equipment (UE), but those skilled in the art may also refer to it as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other appropriate terminology. A UE may be a device (e.g., a mobile device) that provides a user with access to network services.

[0054] In this document, a "mobile" device does not necessarily have the ability to move; it can be stationary. The term mobile device or mobile device broadly refers to a wide variety of devices and technologies. A UE may include many hardware structural components whose size, shape, and arrangement facilitate communication; such components may include antennas, antenna arrays, RF chains, amplifiers, one or more processors, and the like electrically coupled to each other. For example, some non-limiting examples of mobile devices include mobile stations, cellular (cell) phones, smartphones, Session Initiation Protocol (SIP) phones, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablet devices, personal digital assistants (PDAs), and a wide range of embedded systems, such as those corresponding to the "Internet of Things" (IoT). In addition, a mobile device may be a car or other transportation vehicle, a remote sensor or actuator, a robot or robotic device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a quadcopter, a multi-purpose helicopter, a quadcopter, a remote control device, a consumer device and / or a wearable device such as glasses, a wearable camera, a virtual reality device, a smartwatch, a health or fitness tracker, a digital audio player (e.g., an MP3 player), a camera, a game console, and the like. In addition, the mobile device can be a digital home or smart home device such as home audio, video and / or multimedia equipment, home appliances, vending machines, smart lighting, home security systems, smart meters, and the like. In addition, the mobile device can be a smart energy device, security equipment, solar panels or solar arrays, municipal infrastructure equipment that controls electricity (e.g., smart grid), lighting, water, and the like; industrial automation and enterprise equipment; logistics controllers; agricultural equipment; military defense equipment, vehicles, aircraft, ships, and weapons, and the like. In addition, the mobile device can provide connected medicine or telemedicine support (e.g., telehealth care). Telemedicine devices can include telemedicine monitoring devices and telemedicine management devices, whose communications can be prioritized or given priority access relative to other types of information, for example, priority access for the transmission of critical service data and / or associated QoS for the transmission of critical service data.

[0055] The wireless communications between the RAN 104 and the UE 106 may be described as using an air interface. Transmissions over the air interface from a base station (e.g., base station 108) to one or more UEs (e.g., UE 106) may be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink may refer to point-to-multipoint transmissions originating from a scheduling entity (described further below; e.g., base station 108). Another way to describe this scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) may be referred to as uplink (UL) transmissions. According to further aspects of the present disclosure, the term uplink may refer to point-to-point transmissions originating from a scheduled entity (described further below; e.g., UE 106).

[0056] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., base station 108) allocates resources for communications between some or all devices and equipment within its service area or cell. In the present disclosure, as discussed further below, a scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communications, a UE 106 (which may be a scheduled entity) may utilize resources allocated by the scheduling entity 108.

[0057] Base station 108 is not the only entity that can serve as a scheduling entity. That is, in some examples, a UE can serve as a scheduling entity, scheduling resources for one or more scheduled entities (eg, one or more other UEs).

[0058] like Figure 1 , a scheduling entity 108 may broadcast downlink traffic 112 to one or more scheduled entities 106. Broadly speaking, a scheduling entity 108 is a node or device responsible for scheduling traffic in a wireless communication network, including downlink traffic 112 and, in some examples, uplink traffic 116 from one or more scheduled entities 106 to the scheduling entity 108. On the other hand, a scheduled entity 106 is a node or device that receives downlink control information 114, which includes, but is not limited to, scheduling information (e.g., grants), synchronization or timing information, or other control information from another entity in the wireless communication network, such as the scheduling entity 108.

[0059] Typically, base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of the wireless communication system. Backhaul 120 may provide a link between base stations 108 and core network 102. Additionally, in some examples, a backhaul network may provide interconnections between base stations 108. Various types of backhaul interfaces may be employed, such as a direct physical connection using any suitable transport network, a virtual network, and the like.

[0060] The core network 102 can be part of the wireless communication system 100 and can be independent of the radio access technology used in the RAN 104. In some examples, the core network 102 can be configured according to 5G standards (e.g., 5GC). In other examples, the core network 102 can be configured according to 4G Evolved Packet Core (EPC) or any other suitable standard or configuration.

[0061] Figure 2 is a conceptual diagram of an example radio access network (RAN) 200 according to some aspects. In some examples, the RAN 200 can be similar to that described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into cellular regions (cells), which may be uniquely identified by a user equipment (UE) based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206, as well as small cell 208, are shown, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors within a cell are served by the same base station. Radio links within a sector can be identified by a single logical identifier belonging to that sector. In a cell divided into sectors, multiple sectors within the cell may be formed by antenna groups, each of which is responsible for communicating with UEs in a portion of the cell.

[0062] exist Figure 2 , two base stations 210 and 212 are shown in cells 202 and 204; a third base station 214 is shown controlling a remote radio head (RRH) 216 in cell 206. That is, the base stations may have integrated antennas or may be connected to antennas or RRHs via feeder cables. In the example shown, cells 202, 204, and 216 may be referred to as macro cells because base stations 210, 212, and 214 support cells having large sizes. Additionally, base station 218 is shown in a small cell 208 (e.g., a micro cell, pico cell, femto cell, home base station, home node B, home eNode B, etc.) that may overlap with one or more macro cells. In this example, cell 208 may be referred to as a small cell because base station 218 supports cells having relatively small sizes. Cell sizing may be accomplished based on system design and component constraints.

[0063] It should be understood that the radio access network 200 may include any number of wireless base stations and cells. In addition, relay nodes may be deployed to extend the size or coverage area of ​​a given cell. Base stations 210, 212, 214, 218 provide wireless access points to the core network for any number of mobile devices. In some examples, base stations 210, 212, 214, and / or 218 may be similar to those described above and described in Figure 1 The base station / scheduling entity 108 shown in FIG.

[0064] Figure 2 Also included is a quadcopter or drone 220 configured to act as a base station. That is, in some examples, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of a mobile base station such as the quadcopter 220.

[0065] Within the RAN 200, cells may include UEs that may communicate with one or more sectors of each cell. In addition, each base station 210, 212, 214, 218, and 220 may be configured to provide connectivity to the core network 102 (see FIG. 1 ) for all UEs in the respective cell. Figure 1 ) access point. For example, UEs 222 and 224 can communicate with base station 210; UEs 226 and 228 can communicate with base station 212; UEs 230 and 232 can communicate with base station 214 via RRH 216; UE 234 can communicate with base station 218; and UE 236 can communicate with base station 220. In some examples, UEs 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, and / or 242 can communicate with the base stations described above and in Figure 1 The UE / scheduled entity 106 shown in FIG. 1 is the same as that shown in FIG.

[0066] In some examples, a mobile network node (eg, quadcopter 220 ) can be configured to function as a UE. For example, quadcopter 220 can operate within cell 202 by communicating with base station 210 .

[0067] In another aspect of RAN 200, sidelink signals can be used between UEs without having to rely on scheduling or control information from a base station. For example, two or more UEs (e.g., UE 226 and 228) can use peer-to-peer (P2P) or sidelink signals 227 to communicate with each other without having to relay the communication through a base station (e.g., base station 212). In another example, UE 238 is shown as communicating with UEs 240 and 242. Here, UE 238 can serve as a scheduling entity or primary sidelink device, while UEs 240 and 242 can serve as scheduled entities or non-primary (e.g., auxiliary) sidelink devices. In another example, a UE can act as a scheduling entity in a device-to-device (D2D), peer-to-peer (P2P), or vehicle-to-vehicle (V2V) network and / or a mesh network. In the mesh network example, in addition to communicating with scheduling entity 238, UE 240 and UE 242 can also optionally communicate directly with each other. Thus, in a wireless communication system with scheduled access to time-frequency resources and having a cellular configuration, a P2P configuration, or a mesh configuration, a scheduling entity and one or more scheduled entities may communicate using the scheduled resources.

[0068] The air interface in the radio access network 200 can utilize one or more duplex algorithms. Duplex refers to a point-to-point communication link in which two endpoints can communicate with each other in both directions. Full-duplex means that two endpoints can communicate with each other simultaneously. Half-duplex means that only one endpoint can send information to the other endpoint at a time. In wireless links, full-duplex channels generally rely on physical isolation of the transmitter and receiver and appropriate interference cancellation techniques. Full-duplex emulation is often achieved for wireless links by utilizing frequency division duplex (FDD) or time division duplex (TDD). In FDD, transmissions in different directions operate on different carrier frequencies. In TDD, transmissions in different directions on a given channel are separated from each other using time division multiplexing. That is, at certain times, the channel is dedicated to transmissions in one direction, while at other times, the channel is dedicated to transmissions in the other direction, where the direction can change very quickly (e.g., several times per time slot).

[0069] The air interface in the radio access network 200 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of various devices. For example, the 5G NR specification provides for multiple access using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) for UL transmissions from UEs 222 and 224 to the base station 210, and multiplexing for DL ​​transmissions from the base station 210 to one or more UEs 222 and 224. In addition, for UL transmissions, the 5G NR specification provides support for discrete Fourier transform spread OFDM (DFT-s-OFDM) with CP, which is also called single carrier FDMA (SC-FDMA). However, within the scope of the present disclosure, multiplexing and multiple access are not limited to the above schemes and can be provided using time division multiple access (TDMA), code division multiple access (CDMA), frequency division multiple access (FDMA), sparse code multiple access (SCMA), resource spread multiple access (RSMA), or other suitable multiple access schemes. In addition, multiplexed DL transmissions from the base station 210 to the UEs 222 and 224 can be provided using time division multiplexing (TDM), code division multiplexing (CDM), frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), sparse code multiplexing (SCM), or other suitable multiplexing schemes.

[0070] In some aspects of the present disclosure, the scheduling entity and / or the scheduled entity may be configured for beamforming and / or multiple-input multiple-output (MIMO) techniques. Figure 3 An example of a wireless communication system 300 supporting MIMO is shown. In a MIMO system, a transmitter 302 includes multiple transmit antennas 304 (e.g., N transmit antennas) and a receiver 306 includes multiple receive antennas 308 (e.g., M receive antennas). Thus, there are N×M signal paths 310 from the transmit antennas 304 to the receive antennas 308. Each of the transmitter 302 and the receiver 306 can be implemented, for example, within the scheduling entity 108, the scheduled entity 106, or any other suitable wireless communication device.

[0071] The use of this multi-antenna technology enables wireless communication systems to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to send different data streams (also called layers) simultaneously on the same time-frequency resources. Data streams can be sent to a single UE to increase the data rate, or to multiple UEs to increase the overall system capacity, the latter of which is called multi-user MIMO (MU-MIMO). This is achieved by spatially precoding each data stream (i.e., multiplying the data stream with different weights and phase shifts), and then transmitting each spatially precoded stream through multiple transmit antennas on the downlink. The spatially precoded data streams arrive at the UE with different spatial signatures, which enables each UE to recover one or more data streams destined for the UE. On the uplink, each UE sends a spatially precoded data stream, which enables the base station to identify the source of each spatially precoded data stream.

[0072] The number of data streams or layers corresponds to the rank of the transmission. Typically, the rank of the MIMO system 300 is limited by the number of transmit antennas 304 or receive antennas 308, whichever is lower. In addition, the channel conditions at the UE and other considerations (e.g., available resources at the base station) may also affect the transmission rank. For example, the rank (and therefore the number of data streams) assigned to a particular UE on the downlink can be determined based on a rank indicator (RI) sent from the UE to the base station. The RI can be determined based on the antenna configuration (e.g., the number of transmit and receive antennas) and the signal to interference plus noise ratio (SINR) measured on each receive antenna. For example, the RI can indicate the number of layers that can be supported under the current channel conditions. The base station can use the RI together with resource information (e.g., available resources and the amount of data to be scheduled for the UE) to assign a transmission rank to the UE.

[0073] In a time division duplex (TDD) system, the uplink and downlink are reciprocal because they each use different time slots of the same frequency bandwidth. Therefore, in a TDD system, the base station can assign a rank for DL ​​MIMO transmission based on UL SINR measurements (e.g., based on a sounding reference signal (SRS) or other pilot signal sent from the UE). Based on the assigned rank, the base station can then send a CSI-RS with a separate CSI-RS sequence for each layer to provide multi-layer channel estimation. Based on the CSI-RS, the UE can measure the channel quality across layers and resource blocks and feed back CQI and RI values ​​to the base station for updating the rank and allocating REs for future downlink transmissions.

[0074] In the simplest case, such as Figure 3As shown in , a rank-2 spatial multiplexing transmission on a 2x2 MIMO antenna configuration will transmit one data stream from each transmit antenna 304. Each data stream follows a different signal path 310 to each receive antenna 308. Receiver 306 can then reconstruct the data stream using the signals received from each receive antenna 309.

[0075] Reference Figure 4 Various aspects of the present disclosure are described using the OFDM waveforms schematically illustrated in FIG. It will be appreciated by those skilled in the art that various aspects of the present disclosure can be applied to DFT-s-OFDMA waveforms in substantially the same manner as described herein below. That is, while some examples of the present disclosure focus on OFDM links for clarity, it will be appreciated that the same principles can also be applied to DFT-s-OFDMA waveforms.

[0076] In this disclosure, a frame refers to a 10 ms duration of a wireless transmission, where each frame consists of 10 subframes, each 1 ms. On a given carrier, there may be one set of frames in the UL and another set of frames in the DL. Figure 4 , Figure 4 An expanded view of an exemplary DL subframe 402 is shown, illustrating an OFDM resource grid 404. However, as will be readily appreciated by those skilled in the art, the PHY transmission structure for any particular application may differ from the examples described herein depending on any number of factors. Here, time is the horizontal direction in units of OFDM symbols, and frequency is the vertical direction in units of subcarriers or tones.

[0077] Resource grid 404 can be used to schematically represent the time-frequency resources for a given antenna port. That is, in a MIMO implementation with multiple antenna ports available, corresponding multiple resource grids 404 can be used for communication. Resource grid 404 is divided into multiple resource elements (REs) 406. An RE, which is 1 subcarrier x 1 symbol, is the smallest discrete portion of the time-frequency grid and contains a single complex value representing data from a physical channel or signal. Depending on the modulation used in a particular implementation, each RE can represent one or more information bits. In some examples, a block of REs can be referred to as a physical resource block (PRB) or more simply a resource block (RB) 408, which contains any suitable number of consecutive subcarriers in the frequency domain. In one example, an RB can include 12 subcarriers, a number that does not depend on the digital scheme used. In some examples, depending on the digital scheme, an RB can include any suitable number of consecutive OFDM symbols in the time domain. In this disclosure, it is assumed that a single RB, such as RB 408, corresponds entirely to a single communication direction (transmission or reception for a given device).

[0078] A UE typically utilizes only a subset of the resource grid 404. An RB may be the smallest unit of resources allocated to a UE. Thus, the more RBs scheduled to a UE and the higher the modulation scheme selected for the air interface, the higher the data rate for the UE.

[0079] In this illustration, RB 408 is shown as occupying less than the entire bandwidth of subframe 402, with some subcarriers shown above and below RB 408. In a given implementation, subframe 402 may have a bandwidth corresponding to any number of RBs in one or more RBs 408. Furthermore, in this illustration, RB 408 is shown as occupying less than the entire duration of subframe 402, but this is merely one possible example.

[0080] Each subframe 402 (e.g., a 1 ms subframe) may be composed of one or more adjacent time slots. Figure 4 In the example shown, as an illustrative example, a subframe 402 includes four time slots 410. In some examples, time slots can be defined based on a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a time slot can include 7 or 14 OFDM symbols with a nominal CP. Other examples may include mini-slots with shorter durations (e.g., 1, 2, 4, or 7 OFDM symbols). In some cases, these mini-slots can be sent occupying resources scheduled for ongoing time slot transmissions for the same or different UEs.

[0081] An expanded view of one of the time slots 410 shows the time slot 410 including a control region 412 and a data region 414. In general, the control region 412 may carry a control channel (e.g., a PDCCH), and the data region 414 may carry a data channel (e.g., a PDSCH or a PUSCH). Of course, a time slot may contain all DL, all UL, or at least one DL portion and at least one UL portion. Figure 4 The simple structure shown in is merely exemplary in nature, and different slot structures may be employed, and may include one or more of each of the control region and the data region.

[0082] Although Figure 4 Although not shown, each RE 406 within an RB 408 may be scheduled to carry one or more physical channels, including a control channel, a shared channel, a data channel, etc. Other REs 406 within an RB 408 may also carry pilot or reference signals. These pilot or reference signals may be provided for a receiving device to perform channel estimation for the corresponding channel, which may enable coherent demodulation / detection of the control and / or data channels within the RB 408.

[0083] In a DL transmission, a transmitting device (e.g., a scheduling entity 108) may allocate one or more REs 406 (e.g., within a control region 412) to carry DL control information 114, including one or more DL control channels (which typically carry information originating from higher layers) (e.g., a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc.) to one or more scheduled entities 106. In addition, DL REs may be allocated to carry DL physical signals that typically do not carry information originating from higher layers. These DL physical signals may include a primary synchronization signal (PSS); a secondary synchronization signal (SSS); a demodulation reference signal (DM-RS); a phase tracking reference signal (PT-RS); a channel state information reference signal (CSI-RS), etc.

[0084] The synchronization signals PSS and SSS (collectively referred to as SS), and in some examples the PBCH, may be transmitted in an SS block, where an SS block includes four consecutive OFDM symbols numbered by time indices in increasing order from 0 to 3. In the frequency domain, an SS block may extend to 240 consecutive subcarriers, numbered by frequency indices in increasing order from 0 to 239. Of course, the present disclosure is not limited to this particular SS block configuration. Other non-limiting examples within the scope of the present disclosure may utilize more or less than two synchronization signals; may include one or more supplemental channels in addition to the PBCH; may omit the PBCH; and / or may utilize non-consecutive symbols of an SS block.

[0085] The PDCCH may carry downlink control information (DCI) for one or more UEs in a cell. This may include, but is not limited to, power control commands, scheduling information, grants, and / or RE allocations for DL ​​and UL transmissions.

[0086] In an UL transmission, a transmitting device (e.g., the scheduled entity 106) may utilize one or more REs 406 to carry UL control information 118 (UCI). The UCI may originate from higher layers to the scheduling entity 108 via one or more UL control channels (e.g., the physical uplink control channel (PUCCH), the physical random access channel (PRACH), etc.). Furthermore, the UL REs may carry UL physical signals that typically do not carry information originating from higher layers, such as a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), a sounding reference signal (SRS), etc. In some examples, the control information 118 may include a scheduling request (SR), i.e., a request by the scheduling entity 108 to schedule an uplink transmission. Here, in response to the SR sent on the control channel 118, the scheduling entity 108 may transmit downlink control information 114, wherein the downlink control information 114 schedules resources for uplink packet transmission.

[0087] The UL control information may also include hybrid automatic repeat request (HARQ) feedback, such as an acknowledgment (ACK) or negative acknowledgment (NACK), channel state information (CSI), or any other suitable UL control information. HARQ is a technique known to those skilled in the art in which the integrity of a packet transmission may be checked for accuracy on the receiving side, for example, using any suitable integrity check mechanism such as a checksum or a cyclic redundancy check (CRC). If the integrity of the transmission is confirmed, an ACK may be sent, whereas if not, a NACK may be sent. In response to the NACK, the transmitting device may send a HARQ retransmission, which may implement chase combining, incremental redundancy, and the like.

[0088] In addition to control information, one or more REs 406 may also be allocated for user data or traffic data (e.g., within the data region 414). The traffic may be carried on one or more traffic channels (e.g., a physical downlink shared channel (PDSCH) for DL ​​transmissions or a physical uplink shared channel (PUSCH) for UL transmissions).

[0089] The channels or carriers described above are not necessarily all of the channels or carriers that may be used between the scheduling entity 108 and the scheduled entity 106, and one of ordinary skill in the art will recognize that other channels or carriers (e.g., other traffic, control, and feedback channels) may be used in addition to the channels or carriers shown.

[0090] These physical channels described above are typically multiplexed and mapped onto transport channels for processing at the Medium Access Control (MAC) layer. Transport channels carry blocks of information called transport blocks (TBs). The transport block size (TBS) may correspond to the number of information bits and may be a controlled parameter based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0091] Example Implementation

[0092] In wireless networks such as LTE or NR, SRS antenna switching can enable downlink (DL) beamforming in the TDD band by leveraging channel reciprocity and UL sounding (e.g., for PUSCH scheduling / beamforming). A UE may have more receive (Rx) antennas than transmit (Tx) antennas. In SRS antenna switching operation, the UE can use the Rx antennas to transmit SRS to sound the channel so that the scheduling entity can determine the DL channel quality of each RX antenna for DL ​​beamforming. During antenna switching, the UE can switch between Rx antennas when transmitting SRS. NR Release 15 supports SRS antenna switching for up to four receive (Rx) antennas, depending on the capabilities of the UE. Some exemplary antenna switching configurations are 1T2R, 1T4R, 2T4R, and T=R. The 1T2R antenna configuration indicates that one transmit antenna is selected from two receive antennas. The 1T4R antenna configuration indicates that one transmit antenna is selected from four receive antennas. The 2T4R antenna configuration indicates that two transmit antennas are selected from four receive antennas. The NR specification currently supports NR SRS resources that can span 1, 2, or 4 adjacent symbols, with up to 4 antenna ports per SRS resource. The NR specification may allow the use of multiple SRS resource sets for SRS sounding with antenna switching.

[0093] In some aspects of the present disclosure, a UE may have more than four antennas that can be used for SRS antenna switching. For example, a UE may have eight Rx antennas that can be used for various SRS antenna switching schemes (e.g., 1T8R, 2T8R, 4T8R, etc.). Therefore, in some aspects of the present disclosure, an SRS resource set may contain up to eight SRS resources, or more than two SRS resource sets may be defined, with a total of eight resources across all resource sets for SRS antenna switching. It is also contemplated in the present disclosure that the SRS antenna switching scheme can be extended to support more than four antenna ports.

[0094] A given SRS resource can be configured as aperiodic, periodic, or semi-persistent. According to the periodic configuration, the SRS resource is configured with slot-level periodicity and slot offset. According to the semi-persistent configuration, the SRS resource is configured with slot-level periodicity and slot offset, and a medium access control (MAC) control element (CE) can be used to control (e.g., activate or deactivate) the semi-persistent SRS resource set. According to the aperiodic configuration, downlink control information (DCI) in a downlink control channel (e.g., PDCCH) can be used to trigger SRS transmission, and the DCI triggers the aperiodic SRS resource on a per-set basis.

[0095] The current version 15NR specification uses a 2-bit SRS request field included in the DCI to trigger the transmission of aperiodic SRS. Each (non-zero) code point of the SRS request field can correspond to an SRS trigger state. For example, the code points of the 2-bit field are 0 (bit 00), 1 (bit 10), 2 (bit 10), and 3 (bit 11). Each SRS resource set belongs to one or more SRS trigger states. In some examples, the SRS trigger state can be stored in a list or table (e.g., AperiodicSRS-ResourceTriggerList), where each entry (e.g., AperiodicSRS-ResourceTrigger) corresponds to an SRS trigger state. Therefore, the AperiodicSRS-ResourceTriggerList indicates the association between the aperiodic SRS trigger state and the SRS resource set. When the SRS trigger state is triggered, all SRS resources of the resource set associated with the trigger state are triggered.

[0096] While the SRS triggering scheme described above works well with up to four antennas for SRS antenna switching, it can be inefficient and result in undesirably high overhead when more antennas are used. For example, for a UE with eight Rx antennas, up to eight SRS resources in a resource set associated with the triggering state are triggered at once. If all eight SRS resources are enabled simultaneously, this results in undesirably high overhead.

[0097] Some aspects of the present disclosure provide various MAC CE-based SRS resource control schemes that can provide an efficient way to configure and control SRS resources for SRS antenna switching and triggering aperiodic SRS. In some aspects of the present disclosure, a scheduling entity may send a MAC CE command to a UE or a scheduled entity to perform dynamic activation and deactivation of SRS resources for one or more SRS resource sets. In one aspect, for all periodic, semi-persistent, and aperiodic SRS resource sets, the MAC CE may include an N-bit field (N is the number of SRS resources available in the SRS resource set) to control which SRS resources in the set are turned on (activated) or off (deactivated). In one aspect, for an aperiodic SRS resource set, the MAC CE may indicate whether to activate or deactivate the SRS resources of the SRS resource set for a subset of the configured DCI code points. In one example, if a non-periodic SRS resource set with four SRS resources (e.g., first, second, third, and fourth SRS resources) can be triggered using DCI code points 1 and 2, the MAC CE command can indicate that for code point 1, the first and third SRS resources are activated; and for code point 2, the second and fourth SRS resources are activated.

[0098] Figure 5 is a diagram showing a design of a MAC CE 500 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 500 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 500 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 5 MAC CE 500 has an SRS resource set cell ID field (in Figure 5 MAC CE 500 has an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 5 The BWP ID of the SRS resource set is shown in FIG, which identifies the bandwidth part (BWP) configured with the SRS resource set associated with the MAC CE.

[0099] MAC CE 500 also includes one or more SRS resource set ID fields. Each SRS resource set ID field indicates the following SRS resource (S i,j ) belongs to the SRS resource set ID. Figure 5 Two exemplary SRS resource set ID fields (eg, SRS resource set ID0 and SRS resource set ID1) are shown in FIG. An SRS resource set may be configured with one of the resource set types (eg, periodic, semi-persistent, or aperiodic). i,j The SRS resource set ID field indicates the SRS resource in the corresponding SRS resource set identified by the SRS resource set ID field. For example, for SRS resource set ID0, the multiple groups of SRS resources following the SRS resource set ID0 field in the MAC CE are i,j To indicate SRS resources. i,j Can be arranged in multiple octets, S i,j Each octet of S corresponds to a DCI code point. i,j If it is set to 1, the corresponding SRS resource is activated (ie, turned on or enabled); otherwise, the SRS resource is deactivated (ie, turned off or disabled).

[0100] In this example, a maximum of eight SRS resources can be included in one resource set. i,j The subscript i indicates the corresponding DCI code point, S i,jThe subscript j indicates the corresponding SRS resource j configured for SRS antenna switching, for example, the SRS-ResourceIdList of the RRC parameter SRS-ResourceSet of the SRS resource set has the "antennaSwitching" purpose set. If more than one SRS resource set is activated (for example, SRS resource set ID0 and SRS resource set ID1), the MAC CE 500 may include multiple groups of SRS corresponding to the same DCI code point. i,j For example, S at octet 3 and octet N+2 0,7 ,S 0,6 …S 0,0 Corresponds to DCI code point 0, while S at octet 4 and octet N+3 1,7 ,S 1,6 …S 1,0 Corresponding to DCI code point 1. For one DCI code point, up to 8 RS resources in all resource sets can be activated (by S i,j For example, if X SRS resources of SRS resource set ID0 are activated for a certain DCI codepoint, then a maximum of 8-X SRS resources can be activated for SRS resource set ID1 for the same codepoint. The number of DCI codepoints depends on the length of the SRS request field in the DCI.

[0101] Figure 6 is a diagram showing a design of a MAC CE 600 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 600 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 600 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 6 MAC CE 600 has an SRS resource set cell ID field (in Figure 6 MAC CE 600 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 6 , which is shown as the BWP ID of the SRS resource set in the figure, identifying the BWP configured with the SRS resource set associated with the MACCE.

[0102] MAC CE 600 uses the SRS resource set bitmap to indicate whether to activate the SRS resource set. Figure 6An exemplary 8-bit (in octet 2) SRS resource set bitmap (RS7, RS6, RS5, RS4, RS3, RS2, RS1, RS0) is shown in FIG. For example, if bit RS0 is set to 1, the corresponding SRS resource set is activated; otherwise, if bit RS0 is set to 0, the corresponding SRS resource set is deactivated. One or more groups of SRS resource sets following the SRS resource set bitmap may be used to determine the resource set type. i,j The SRS resource of the activated SRS resource set is indicated in i,j Corresponds to an activated SRS resource set. If multiple SRS resource sets are activated, the SRS resource sets of these groups are arranged in the MAC CE according to the bit order of the SRS resource set bitmap. i,j For example, if two SRS resource sets are activated (e.g., RS6=1 and RS4=1), the SRS resources indicated from octet 3 to octet N correspond to the first activated SRS resource set (e.g., RS6); the SRS resources indicated from octet N+1 to octet M correspond to the second activated SRS resource set (e.g., RS4). Figure 5 The MAC CE 500 described in FIG. 5 may activate a total of eight SRS resources in the set of all activated SRS resources in the MAC CE 600 .

[0103] Figure 7 is a diagram showing a design of a MAC CE 700 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 700 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 700 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 7 MAC CE 700 has an SRS resource set cell ID field (in Figure 7 MAC CE 700 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 7 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0104] MAC CE 700 includes one or more SRS resource set ID fields, which are similar to those described above in MAC CE 500. Each SRS resource set ID field indicates the following SRS resource (defined by S i,jIndicates the SRS resource set ID to which the DCI code point bitmap belongs. For each SRS resource set ID, the MAC CE 700 also includes a DCI code point bitmap indicating the configured DCI code points. For example, for a 2-bit DCI SRS request field, the DCI code point bitmap may include four bits (D3, D2, D1, and D0), each bit corresponding to a code point. For example, the D0 bit corresponds to code point 0, the D1 bit corresponds to code point 1, the D2 bit corresponds to code point 2, and the D3 bit corresponds to code point 3. When any bit (D3, D2, D1, and D0) of the DCI code point bitmap is activated (e.g., set to 1), the corresponding SRS resource activation and deactivation states are triggered; otherwise, if the bit of the DCI code point bitmap is deactivated (e.g., set to 0), the corresponding SRS resource activation and deactivation states are not triggered. The MAC CE may use the DCI code point bitmap to indicate a subset of DCI code points activated or configured for SRS communication. Based on the activated DCI codepoints, the activated / deactivated SRS resources associated with each activated codepoint are indicated in one or more octets following the associated SRS resource set ID field (e.g., Figure 7 For example, for SRS resource set ID0, if the first DCI code point bit activated is D2 (e.g., D2=1) when counting from bit position D3, then the SRS resource S in octet 3 is indicated. i,j (For example, S 0,7 ,S 0,6 ,S 0,5 ,S 0,4 ,S 0,3 ,S 0,2 ,S 0,1 ,S 0,0 ) indicates the associated SRS resources activated or deactivated for code point D2. In this example, eight SRS resources can be controlled for a certain SRS resource set. The SRS resource bit group S associated with each SRS resource set is i,j The number of bits depends on the number of activated code point bits.

[0105] Similarly, the SRS Resource Set ID1 field has an associated DCI code point bitmap and one or more sets of SRS resource bits S according to the activation code point of the code point field (D3, D2, D1 and D0). i,j Although Figure 7 Two SRS resource set ID fields are shown in FIG, but in other examples, the MAC CE 700 may include more or fewer SRS resource set ID fields.

[0106] Figure 88 is a diagram showing a design of a MAC CE 800 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 800 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 800 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 8 MAC CE 800 has an SRS resource set cell ID field (in Figure 8 800 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 8 , which is shown as the BWP ID of the SRS resource set in the figure, identifying the BWP configured with the SRS resource set associated with the MACCE.

[0107] MAC CE 800 includes one or more SRS resource set ID fields, which are similar to those described above in MAC CE 500. Each SRS resource set ID field indicates the following SRS resource triggering state (in Figure 8 Displayed as SRS resource trigger status ID i,j ) belongs to the SRS resource set ID. Figure 8 , SRS resource set ID 0 and SRS resource set ID 1 are illustrated. In other examples, MAC CE 800 may include more or fewer SRS resource set ID fields. A scheduling entity (e.g., a gNB) may use semi-persistent or semi-static scheduling (e.g., radio resource control (RRC) signaling) to pre-configure an SRS-ResourceTriggerState list that includes the number of SRS resource triggering states for each configured SRS resource set ID. The number of SRS resource triggering states depends on the number of bits used in the SRS-ResourceTriggerState ID or index used to indicate the desired SRS resource triggering state. For example, an 8-bit SRS-ResourceTriggerState ID can indicate up to 256 SRS resource triggering states.

[0108] In some aspects of the present disclosure, an SRS resource triggering state may indicate a predetermined SRS resource activation / deactivation combination pre-configured using RRC. For example, SRS resources may be configured for SRS antenna switching, e.g., by setting the "antennaSwitching" purpose within the SRS-ResourceIdList of the RRC parameter SRS-ResourceSet for the SRS resource set. The MAC CE 800 maps the SRS resource triggering state to a DCI code point for each SRS resource set. If multiple SRS resource sets are activated, the MAC CE may map multiple SRS resource triggering states for different SRS resource sets to the same DCI code point.

[0109] For example, if the MAC CE 800 has two activated SRS resource sets (eg, SRS resource set ID0 and SRS resource set ID1), each DCI code point is associated with two SRS resource triggering states corresponding to different SRS resource sets, respectively. Figure 8 In the example shown, SRS-Resource Trigger Status ID 0,0 (in octet 3) and SRS - Resource Trigger Status ID 1,0 (at octet N+2) are mapped to DCI code point 0. Therefore, DCI code point 0 can trigger two states in SRS communication. In this example, for each DCI code point, up to 8 SRS resources across all resource sets can be activated.

[0110] Figure 9 1 is a diagram showing a design of a MAC CE 900 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 900 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 900 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 9 MAC CE 900 has an SRS resource set cell ID field (in Figure 9 MAC CE 900 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 9 , which is shown as the BWP ID of the SRS resource set in the figure, identifying the BWP configured with the SRS resource set associated with the MACCE.

[0111] MAC CE 900 includes one or more SRS resource set ID fields (in Figure 9 Displayed as SRS resource set ID i), which are similar to those described above in MAC CE 500. Each SRS resource set ID field indicates an SRS resource set that can be used for SRS communication in one or more SRS resource triggering states. Figure 9 In the example, SRS resource set ID 0 and SRS resource set ID 1 are illustrated. In other examples, MAC CE 900 may include more or fewer SRS resource set ID fields. The scheduling entity (e.g., gNB) may use semi-static or semi-persistent control (e.g., RRC signaling) to pre-configure an SRS-ResourceTriggerState list that includes multiple SRS resource trigger states for SRS communication.

[0112] In this example, the maximum number of SRS resource triggering states depends on the number of bits in the SRS resource triggering bitmap included in the MAC CE (T i ). The SRS resource triggering bitmap indicates the SRS resource triggering status for the associated SRS resource set. For example, bits T0 to T K exist Figure 9 Each bit T is shown as an example. i Represents an SRS-ResourceTriggerState in the SRS-ResourceTriggerState list of the associated SRS resource set. i When the bit is activated (e.g., set to 1), the corresponding SRS resource trigger state i is mapped to the corresponding code point of the DCI SRS request field. The code point to which the SRS resource trigger state is mapped is determined by its activation T i The sequential position of all SRS resource triggering states in the Ti field is determined. For example, if only T0 and T4 are activated for a certain SRS resource set, then if counting starts from T0, the sequential position of T0 is earlier than T4. In this case, the SRS resource triggering state of T0 can be mapped to code point 0, and the SRS resource triggering state of T4 can be mapped to the next code point 1. The same concept can be used to map more activated SRS resource triggering states to code points based on the sequential position of the Ti bit. When multiple SRS resource sets (for example, SRS resource set ID0 and SRS resource set ID1) are activated in the MAC CE, each activated T i The SRS resource triggering state i representing the corresponding SRS resource set is mapped to the DCI code point as described above (based on the activated T i The sequential position in the SRS resource trigger bitmap).

[0113] Figure 101 is a diagram showing a design of a MAC CE 1000 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1000 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 1000 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 10 MAC CE 1000 has an SRS resource set cell ID field (in Figure 10 The MAC CE 1000 also includes an SRS resource set BWP ID field (shown as a cell ID of the SRS resource set in FIG). Figure 10 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0114] The MAC CE 1000 uses the SRS resource set bitmap to indicate whether to activate the SRS resource set. Figure 10 An exemplary 8-bit (in octet 2) SRS resource set bitmap (RS7, RS6, RS5, RS4, RS3, RS2, RS1, RS0) is shown in FIG. For example, if bit RS0 is set to 1, the corresponding SRS resource set is activated for SRS communication; otherwise, if bit RS0 is set to 0, the corresponding SRS resource set is deactivated for SRS communication.

[0115] The scheduling entity (e.g., gNB) can use semi-persistent or semi-static control (e.g., RRC signaling) to pre-configure an SRS-ResourceTriggerState list that includes the number of SRS resource triggering states for each SRS resource set. The number of SRS resource triggering states depends on the number of bits used in the SRS-ResourceTriggerState ID or index used to indicate the desired SRS resource triggering state. For example, an 8-bit SRS-ResourceTriggerState ID can indicate up to 256 SRS resource triggering states.

[0116] In some aspects of the present disclosure, an SRS resource triggering state may be associated with a predetermined SRS resource activation / deactivation combination pre-configured using RRC. For example, available SRS resources may be configured for SRS antenna switching, e.g., the "antennaSwitching" purpose may be set in the SRS-ResourceIdList of the RRC parameter SRS-ResourceSet for the SRS resource set. The MAC CE 1000 may map one SRS resource triggering state to each DCI code point for each activated SRS resource set. If multiple SRS resource sets are activated according to the SRS resource set bitmap, the MAC CE may map multiple SRS resource triggering states for different SRS resource sets to the same DCI code point.

[0117] In one example, if the MAC CE 1000 has two activated SRS resource sets (e.g., RS6 and RS4 are both set to 1), the MAC CE 1000 provides two sets of SRS resource triggering status ID fields after the SRS resource set bitmap at octet 2 (in Figure 10 Displayed as SRS resource trigger status ID i,j ). Each set of SRS resource triggering state ID fields corresponds to an activated SRS resource set. Therefore, each DCI code point is associated with two SRS resource triggering states. For example, SRS resource triggering state ID 0,0 (in octet 3) and the SRS resource trigger status ID 1,0 (in octet N+1) corresponds to DCI code point 0. For one DCI code point, a maximum of 8 SRS resources across all resource sets may be activated.

[0118] Figure 11 1 is a diagram showing a design of a MAC CE 1100 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1100 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communication. The MAC CE 1100 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 11 MAC CE 1100 has an SRS resource set cell ID field (in Figure 11 The MAC CE 1100 also includes an SRS resource set BWP ID field (shown as a cell ID of the SRS resource set in FIG). Figure 11 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set described in this MAC CE.

[0119] MAC CE 1100 uses the SRS resource set bitmap to indicate which resource set to activate or deactivate. Figure 11 An exemplary 8-bit SRS resource set bitmap (RS7, RS6, RS5, RS4, RS3, RS2, RS1, RS0) is shown in FIG. For example, if bit RS0 is set to 1, the corresponding SRS resource set is activated; otherwise, if bit RS0 is set to 0, the corresponding SRS resource set is deactivated.

[0120] The scheduling entity (e.g., gNB) may use semi-persistent or semi-static control (e.g., RRC signaling) to pre-configure an SRS-ResourceTriggerState list that includes the number of SRS resource triggering states for each SRS resource set. The number of SRS resource triggering states depends on the number of bits (T) used to indicate the available SRS resource triggering states in the SRS resource triggering bitmap in the MAC CE 1100. i ).For example, Figure 11 Two groups of bits T0 to T are shown in K Each bit of the SRS resource trigger bitmap is T i Indicates an SRS-ResourceTriggerState in the SRS-ResourceTriggerState list for the associated SRS resource set. i When the bit is set to 1, the corresponding SRS resource trigger state i is mapped to the corresponding code point of the DCI SRS request field. The code point to which the SRS resource trigger state is mapped is activated by the T i The SRS resource triggering status of T0 can be mapped to code point 0 and the SRS resource triggering status of T4 can be mapped to the next code point 1. The same concept can be used to determine the sequential position of the bits in all SRS resource triggering status of T4 based on T0. i The sequential position of the bits in the bitmap maps more activated SRS resource triggering states to code points.

[0121] When multiple SRS resource sets are activated in the MAC CE 1100, the MAC CE includes a separate SRS resource triggering bitmap for each activated SRS resource set. Figure 11 Two exemplary SRS resource triggering bitmaps are shown in FIG. In each SRS resource triggering bitmap, the activated T i The field indicates the SRS resource triggering status of the corresponding SRS resource set i based on the activated T i The sequential positions are mapped to DCI code points.

[0122] Figure 12 1 is a diagram showing a design of a MAC CE 1200 for SRS resource control according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1200 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for configuring and controlling SRS communications. The MAC CE 1200 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 12 MAC CE 1200 has an SRS resource set cell ID field (in Figure 12 1200 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 12 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0123] MAC CE 1200 includes one or more SRS resource set ID fields similar to those described above, for example, in MAC CE 500. Each SRS resource set ID field indicates the SRS resource set to which the subsequent SRS resource triggering state belongs. For each SRS resource set ID, MAC CE 1200 includes a DCI code point bitmap indicating the configured DCI code point. For example, for a 2-bit DCI SRS request field, the DCI code point bitmap includes four bits (D3, D2, D1, and D0), each bit corresponding to a code point. For example, the D0 bit corresponds to code point 0, the D1 bit corresponds to code point 1, the D2 bit corresponds to code point 2, and the D3 bit corresponds to code point 3. When any bit of the DCI code point bitmap is activated (e.g., set to 1), the corresponding SRS state is triggered; otherwise, if a bit of the DCI code point bitmap is deactivated (e.g., set to 0), the corresponding SRS state is not triggered. The MAC CE 1200 may use a DCI code point bitmap to indicate a subset of DCI code points that are activated or configured for SRS communication. Based on the activated DCI code points, the activated / deactivated SRS resources associated with each activated code point are indicated in one or more SRS resource triggering states following the associated SRS resource set ID field.

[0124] The scheduling entity (e.g., gNB) may use semi-persistent or semi-static control (e.g., RRC signaling) to pre-configure an SRS-ResourceTriggerState list that includes the number of SRS resource trigger states for each SRS resource set ID. For example, MAC CE 1200 provides SRS-ResourceTriggerState ID for SRS resource set ID 0.0,0 To SRS-Resource Trigger Status ID 0,K MAC CE 1200 also provides SRS-resource triggering state ID for SRS resource set ID1 1,0 To SRS-Resource Trigger Status ID 1,K Each SRS resource triggering state corresponds to a predetermined SRS resource activation / deactivation combination. MAC CE 1200 provides one SRS resource triggering state mapped to each active DCI code point for each SRS resource set included in the MAC CE. Therefore, if multiple SRS resource sets are activated, the MAC CE contains multiple SRS resource triggering states corresponding to the same DCI code point.

[0125] The code point to which the SRS resource trigger state is mapped is determined by the ordinal position of the code point in the bitmap. For example, if only D0 and D3 are activated for SRS resource set ID0, then D0 is earlier in the ordinal position than D3 (if counting starts from D0). In this case, the SRS resource trigger state ID 0,0 Can be mapped to code point 0, SRS resource trigger state ID 0,1 can be mapped to the next code point 3. The same concept can be used to map more activated SRS resource triggering states to code points based on the sequential position of the activated code points in the bitmap.

[0126] In some aspects of the present disclosure, a scheduling entity (e.g., a gNB) may send a MAC CE to a scheduled entity (e.g., a UE) to change a slot offset associated with an SRS resource set (e.g., aperiodic SRS). The SRS slot offset is the number of slots between the triggering DCI and the actual transmission of the corresponding SRS. Using a MAC CE to change the SRS slot offset may achieve lower latency than using semi-static control (e.g., RRC signaling, etc.). In some examples, the scheduling entity may use RRC to configure a default or initial SRS slot offset and use a MAC CE to update the slot offset as needed. In some examples, the MAC CE may include a slot offset field that provides a desired slot offset value. In some examples, the slot offset field may have a value of 0 or any predetermined value to indicate that there is no change to the default or current SRS slot offset. In some examples, information for updating the SRS slot offset may include information described above regarding Figure 5-Figure 12 In any MAC CE described.

[0127] Figure 13FIG2 is a diagram illustrating two exemplary MAC CE designs for updating the time slot offset of an SRS resource set according to some aspects of the present disclosure. The scheduling entity 108 may send a MAC CE 1300 or a MAC CE 1302 to a scheduled entity 106 (e.g., a UE) in the NR RAN 200 for updating the time slot offset of an aperiodic SRS resource set. The MAC CE 1300 / 1302 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in the Figure 13 MAC CE 1300 can provide one slot offset for one aperiodic SRS resource set. MAC CE 1302 can provide multiple slot offsets for multiple aperiodic SRS resource sets. MAC CE 1300 / 1302 has an SRS resource set cell ID field (in Figure 13 The MAC CE 1300 / 1302 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 13 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP associated with the SRS resource set associated with the MAC CE.

[0128] The MAC CE 1300 / 1302 includes one or more SRS resource set ID fields. Two exemplary SRS resource set ID fields are shown for the MAC CE 1302 (eg, AP SRS resource set ID0 and AP SRS resource set ID1). N In some examples, each SRS resource set ID field may correspond to an aperiodic SRS resource set. For each SRS resource set ID field, the MAC CE 1300 / 1302 includes a slot offset field that may indicate the slot offset of the associated SRS resource set. Two exemplary slot offset fields (e.g., slotOffset0 and slotOffset N When the SRS resource set includes a large number of SRS resources, the MAC CE 1300 / 1302 enables the scheduling entity to dynamically update or change the SRS slot offset so that the scheduled entity can use various slot formats and dynamic slot format changes to improve multiplexing of the SRS resource set with other UL channels.

[0129] In one example, the slot offset field (e.g., slotOffset0) may be a 5-bit field. In other examples, the slot offset field may have more or less than 5 bits. The MAC CE 1300 may have a C field (e.g., Figure 13 C0 and C shown in N) to modify the range or value indicated by the corresponding SRS Slot Offset field. The C field (which may be referred to as the content field in this disclosure) allows the Slot Offset field to represent an alternative value that depends on the value of the C field. In one aspect, if C is set to a first value (e.g., 1), the 5-bit Slot Offset field may indicate a value from 1 to 32; and if C is set to a second value (e.g., 0), the SRS Slot Offset field may indicate 0. In another aspect, if C is set to a first value (e.g., 1), the 5-bit Slot Offset field may indicate a value from 0 to 31; and if C is set to a second value (e.g., 0), the SRS Slot Offset field may indicate 32. In some examples, the scheduling entity may use MAC CE 1300 to update the SRS slot offsets of one or more non-periodic SRS resource sets. To this end, MAC CE 1300 may include one or more pairs of C fields and SRS slot offset fields (e.g., C0 / slotOffset0, C1 / slotOffset1, ..., C0 / slotOffset0, C1 / slotOffset1, ..., C0 / slotOffset1) corresponding to multiple SRS resource sets, respectively. N / slotOffset N ).

[0130] In some aspects of the present disclosure, Figure 5-Figure 12 Any MAC CE described includes all or some of the above information of MAC CE 1300.

[0131] Figure 14 is a diagram showing a design of a MAC CE 1400 for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1400 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for triggering aperiodic SRS and / or updating the slot offset of one or more aperiodic SRS resource sets. The MAC CE 1400 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 14 MAC CE 1400 has an SRS resource set cell ID field (in Figure 14 1400 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 14 , which is shown as the BWP ID of the SRS resource set in the figure, identifying the BWP configured with the SRS resource set associated with the MACCE.

[0132] MAC CE 1400 also includes one or more SRS resource set ID fields (shown as AP SRS resource set IDi Each SRS resource set ID field indicates the subsequent SRS resource (S i,j ) belongs to the aperiodic SRS resource set. Figure 14 Two exemplary SRS resource set ID fields (eg, AP SRS resource set ID0 and AP SRS resource set ID1) are shown in FIG. In other examples, the MAC CE 1400 may have more than Figure 14 More or fewer SRS resource set ID fields are shown in S i,j The SRS resource set ID field indicates the SRS resource within the corresponding SRS resource set (e.g., aperiodic SRS resource set) identified by the SRS resource set ID field. i,j If it is set to 1, the corresponding SRS resource is activated (ie, turned on or enabled); otherwise, the SRS resource is deactivated (ie, turned off or disabled).

[0133] For each SRS resource set configured in the MAC CE, the MAC CE 1400 also includes the C field and the slot offset field as described above. Figure 14 Two exemplary C fields (e.g., C0 and C1) and two exemplary slot offset fields (e.g., slotOffset0 and slotOffset1) are shown in FIG. Each slot offset field indicates the value of the SRS slot offset of the associated SRS resource set. Each C field indicates how to interpret the value of the SRS slot offset field. The C field and the slot offset field are similar to Figure 13 Those described in are basically the same, and their redundant descriptions are not repeated here.

[0134] Figure 15 1 is a diagram showing a design of a MAC CE 1500 for SRS resource control and slot offset update according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1500 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for triggering aperiodic SRS and / or updating the slot offset of one or more SRS resource sets. The MAC CE 1500 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 15 MAC CE 1500 has an SRS resource set cell ID field (in Figure 15 15. The MAC CE 1500 further includes an SRS resource set BWPID field (shown as a cell ID of an SRS resource set) that identifies a cell configured with an SRS resource set associated with the MAC CE. The MAC CE 1500 also includes an SRS resource set BWPID field (as shown) that identifies a BWP configured with an SRS resource set associated with the MAC CE.

[0135] MAC CE 1500 is similar to MAC CE 600 in terms of SRS resource control (e.g., activation / deactivation) for each configured SRS resource set. Therefore, their redundant descriptions are not repeated here. Unlike MAC CE 600, MAC CE 1500 also includes multiple C fields (C0 to C1). M ) and the slot offset field (e.g. slotOffset0 to slotOffset M ), these fields correspond to the activated aperiodic SRS resource sets based on bitmaps RS0, RS1, RS2, RS3, RS4, RS5, RS6, RS7. i When ON (e.g., set to 1), the corresponding non-periodic SRS resource set is activated. The C field and the slot offset field are Figure 13 Those described in are basically the same, and their redundant descriptions are not repeated here.

[0136] Figure 16 1 is a diagram showing a design of a MAC CE 1600 for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1600 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for triggering aperiodic SRS and / or updating the slot offset of one or more SRS resource sets. The MAC CE 1600 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 16 MAC CE 1600 has an SRS resource set cell ID field (in Figure 16 1600 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 16 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0137] MAC CE 1600 is similar to MAC CE 900 in terms of SRS resource control (e.g., activation / deactivation) for each configured SRS resource set. Therefore, their redundant descriptions are not repeated here. Unlike MAC CE 900, MAC CE 1600 also includes a C field and a slot offset field corresponding to each SRS resource set (e.g., aperiodic SRS resource set) included in MAC CE 1600. These C fields and slot offset fields are Figure 13 Those described in are basically the same, and their redundant descriptions are not repeated here.

[0138] Figure 17 1 is a diagram showing a design of a MAC CE 1700 for aperiodic SRS resource control and slot offset update according to some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1700 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 to trigger aperiodic SRS and / or update the slot offset of one or more SRS resource sets. The MAC CE 1700 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 17 MAC CE 1700 has an SRS resource set cell ID field (in Figure 17 1700 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 17 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0139] MAC CE 1700 is configured to receive a resource set ID field (e.g., Figure 17 0 and AP SRS resource set ID1) are similar to the MAC CE 800 in terms of SRS resource control (e.g., activation / deactivation) for each configured SRS resource set identified by the AP SRS resource set ID0 and AP SRS resource set ID1 shown in FIG. Therefore, their redundant descriptions are not repeated here. Unlike the MAC CE 800, the MAC CE 1700 also includes a C field and a slot offset field corresponding to each non-periodic SRS resource set included in the MAC CE 1700. For example, the MAC CE 1700 includes a C0 field and a slotOffset0 field for the AP SRS resource set ID0, and a C1 field and a slotOffset1 field for the AP SRS resource set ID1. These C fields and slot offset fields are the same as those in FIG. Figure 13 Those described in are basically the same, and their redundant descriptions are not repeated here.

[0140] Figure 181 is a diagram showing a design of a MAC CE 1800 for aperiodic SRS resource control and slot offset update in accordance with some aspects of the present disclosure. The scheduling entity 108 may send the MAC CE 1800 to the scheduled entity 106 (e.g., UE) in the NR RAN 200 for triggering aperiodic SRS and / or updating the slot offset of one or more aperiodic SRS resource sets. The MAC CE 1800 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 18 MAC CE 1800 has an SRS resource set cell ID field (in Figure 18 MAC CE 1800 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 18 , which is shown as the BWP ID of the SRS resource set in the figure, identifying the BWP configured with the SRS resource set associated with the MACCE.

[0141] MAC CE 1800 is configured to receive a resource set ID field (e.g., Figure 18 0 and AP SRS resource set ID1 in the MAC CE 1800. Therefore, their redundant descriptions are not repeated here. Unlike the MAC CE 1200, the MAC CE 1800 also includes a C field and a slot offset field corresponding to each non-periodic SRS resource set included in the MAC CE 1800. For example, the MAC CE 1800 includes a C0 field and a slotOffset0 field for the AP SRS resource set ID0, and a C1 field and a slotOffset1 field for the AP SRS resource set ID1. These C fields and slot offset fields are the same as those in the MAC CE 1200. Figure 13 Those described in are basically the same, and their redundant descriptions are not repeated here.

[0142] In Release 15 of the NR specification, when periodic or semi-persistent SRS resource sets are configured, the NZP-CSI-RS-ResourceId parameter used for measurement is indicated by the higher-layer RRC parameter associatedCSI-RS in the SRS resource set. In this case, the associatedCSI-RS parameter provides spatial information (e.g., beam direction / information for SRS transmission) for the SRS resources within the SRS resource set. The spatial relationship information for the SRS resources can be based on SS blocks (SSBs), CSI-RS, or SRS. In NR networks, the scheduling entity can use RRC to configure the associatedCSI-RS parameters associated with the SRS resource set. However, this approach is inflexible and may result in undesirable delays if the network needs to reconfigure the association. In some aspects of the present disclosure, the scheduling entity (e.g., gNB) can send a MAC CE to the scheduled entity (e.g., UE) to update the associated CSI-RS parameters with lower latency than using RRC signaling.

[0143] Figure 19 is a diagram illustrating two exemplary MAC CE designs for updating associated CSI-RS information for an SRS resource set according to some aspects of the present disclosure. The scheduling entity 108 may send a MAC CE 1900 / 1902 to a scheduled entity 106 (e.g., a UE) in the NR RAN 200 to update associated CSI-RS information for one or more periodic, semi-persistent, or aperiodic SRS resource sets configured to use antenna switching. The MAC CE 1900 has a predetermined number of bits arranged in various bit fields. Some bits may be reserved (in Figure 19 MAC CE 1900 can provide one CSI-RS information for one SRS resource set. MAC CE 1902 can provide multiple CSI-RS information for multiple SRS resource sets. MAC CE 1900 / 1902 has an SRS resource set cell ID field (in Figure 19 The MAC CE 1900 / 1902 also includes an SRS resource set BWP ID field (shown as a cell ID of an SRS resource set in FIG). Figure 19 The BWP ID of the SRS resource set is shown in FIG, which identifies the BWP configured with the SRS resource set associated with the MAC CE.

[0144] The MAC CE 1900 / 1902 also includes one or more SRS resource set ID fields. Two exemplary SRS resource set ID fields (eg, SRS resource set ID0 and SRS resource set ID1) are shown in the MAC CE 1902. N ). Each SRS resource set ID field indicates the SRS resource set to which the following CSI-RS ID field belongs. In one example, the CSI-RS ID indicates an updated associated CSI-RS from the non-zero power (NZP) CSI-RS (NZP-CSI-RS) resource space. In MAC CE 1902, the CSI-RS ID0 field provides the ID of the associated CSI-RS for the SRS resource set indicated by SRS resource set ID0. Similarly, the CSI-RS ID N The field is the SRS resource set ID N The indicated SRS resource set provides the ID of the associated CSI-RS.

[0145] In some aspects of the present disclosure, the MAC CE may include the above Figure 5-Figure 19 Various combinations of information of the described MAC CEs enable the MAC CEs to be configured to control, update, or change SRS resource activation / deactivation, aperiodic SRS slot offset, and / or associated CSI-RS information.

[0146] Figure 20 is a block diagram illustrating an example of a hardware implementation for a scheduled entity 2000 employing a processing system 2014. For example, the scheduled entity 2000 may be Figure 1 、 Figure 2 and / or Figure 3 Any one or more of the shown UEs or scheduled entities.

[0147] The scheduled entity 2000 may be implemented using a processing system 2014 including one or more processors 2004. Examples of processors 2004 include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. In various examples, the scheduled entity 2000 may be configured to perform any one or more of the functions described herein. That is, as used in the scheduled entity 2000, the processor 2004 may be used to implement Figure 21 and Figure 22 Any one or more of the processes and procedures described and illustrated in.

[0148] In this example, processing system 2014 can be implemented using a bus architecture, generally represented by bus 2002. Depending on the specific application and overall design constraints of processing system 2014, bus 2002 can include any number of interconnecting buses and bridges. Bus 2002 communicatively couples various circuits, including one or more processors (generally represented by processor 2004), memory 2005, and computer-readable media (generally represented by computer-readable media 2006). Furthermore, bus 2002 may also link various other circuits, such as clock sources, peripherals, voltage regulators, and power management circuits, all of which are well known in the art and are not described in any further detail. Bus interface 2008 provides an interface between bus 2002 and transceiver 2010. Transceiver 2010 provides a communication interface or unit for communicating with various other devices via a transmission medium. Depending on the nature of the device, a user interface 2012 (e.g., a keyboard, display, speaker, microphone, joystick) may also be provided. Of course, such a user interface 2012 is optional and may be omitted in some examples (eg, base stations).

[0149] In some aspects of the present disclosure, the processor 2004 may include processing circuitry 2040 configured for various data and signal processing functions used in wireless communications (e.g., including the functions and processes described in this disclosure). The processor 2004 may also include communication circuitry 2042 configured for various functions, including, for example, uplink and downlink communication functions via the transceiver 2010, for implementing the functions and processes described in this disclosure. In some examples, the transceiver 2010 may be coupled to an antenna array 2011 that includes one or more antennas configured for uplink and / or downlink communications (e.g., SRS communications with antenna switching).

[0150] Processor 2004 is responsible for managing bus 2002 and general processing, including executing software stored on computer-readable medium 2006. When executed by processor 2004, this software causes processing system 2014 to perform the various functions described below for any particular device. Computer-readable medium 2006 and memory 2005 may also be used to store data that is manipulated when processor 2004 executes the software.

[0151] One or more processors 2004 in the processing system can execute software. Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms. The software may be located on a computer-readable medium 2006. The computer-readable medium 2006 may be a non-transitory computer-readable medium. For example, non-transitory computer-readable media include magnetic storage devices (e.g., hard disks, floppy disks, magnetic tapes), optical disks (e.g., compact discs (CDs) or digital versatile discs (DVDs)), smart cards, flash memory devices (e.g., cards, sticks, or key drives), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electronically erasable PROM (EEPROM), registers, removable disks, and any other suitable medium for storing software and / or instructions that can be accessed and read by a computer. Computer-readable medium 2006 can be located within processing system 2014, external to processing system 2014, or distributed across multiple entities including processing system 2014. Computer-readable medium 2006 can be embodied in a computer program product. For example, a computer program product can include a computer-readable medium in packaging material. One of ordinary skill in the art will recognize that how best to implement the functionality described throughout this disclosure depends on the specific application and the design constraints imposed on the overall system.

[0152] In one or more examples, the computer-readable storage medium 2006 may include software configured for various functions, including the wireless communication functions and processes described in this disclosure. In some aspects of the present disclosure, the computer-readable storage medium 2006 may include processing instructions 2052 configured for various data and signal processing functions used in wireless communications, including, for example, the functions and processes described in this disclosure. The computer-readable storage medium 2006 may also include communication instructions 2054 configured for various functions, including, for example, the uplink and downlink communication functions described in this disclosure.

[0153] Figure 21is a flow chart illustrating an example process 2100 for wireless communication using MAC CE between a scheduling entity and a scheduled entity according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required for implementation of all embodiments. In some examples, process 2100 may be performed by Figure 20 In some examples, the process 2100 can be performed by any suitable device or unit for performing the functions or algorithms described below.

[0154] At block 2102, a scheduled entity (e.g., a UE) may receive a medium access control (MAC) control element (CE) from a network (e.g., a scheduling entity or a gNB). The MAC CE includes information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set. In some aspects of the present disclosure, the scheduled entity may use the communication circuit 2042 and the transceiver 2010 to receive the MAC CE in a DL transmission from the scheduling entity (e.g., a gNB or a base station) via one or more antennas.

[0155] In some aspects of the present disclosure, the MAC CE may be a combination of the above Figure 5-Figure 19 Any of the MAC CEs described herein. In some examples, the MAC CE may further include an SRS slot offset field configured to indicate a slot offset in the at least one SRS resource set. In some examples, the MAC CE may further include a channel state information reference signal (CSI-RS) field configured to indicate a CSI-RS associated with the SRS resource set.

[0156] At block 2104, the scheduled entity transmits SRS communications using one or more SRS resources included in at least one SRS resource set based on the information in the MAC CE. In some aspects of the present disclosure, the scheduled entity may use the communication circuit 2042 and the transceiver 2010 to transmit SRS communications via one or more antennas (e.g., using antenna switching for transmitting SRS).

[0157] Figure 22 is a flow chart illustrating an example process 2200 for wireless communication using MAC CE between a scheduling entity and a scheduled entity according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required for implementation of all embodiments. In some examples, the process 2200 may be performed by Figure 20In some examples, the process 2200 can be performed by any suitable device or unit for performing the functions or algorithms described below.

[0158] At block 2202, a scheduled entity (e.g., a UE) receives a MAC CE from the network. In some aspects of the present disclosure, the scheduled entity may use communication circuitry 2042 and transceiver 2010 to receive the MAC CE in a DL transmission from a scheduling entity (e.g., a gNB or base station) via one or more antennas. In some aspects of the present disclosure, the MAC CE includes an SRS resource set field configured to indicate an SRS resource set for SRS communication and a CSI-RS field configured to indicate a CSI-RS associated with the SRS resource set.

[0159] At block 2204, the scheduled entity receives CSI-RS associated with the SRS resource set from the network. The scheduled entity may use the communication circuit 2042 and the transceiver 2010 to receive the CSI-RS associated with the SRS resource set from the network (e.g., a gNB) via one or more antennas.

[0160] Figure 23 is a conceptual diagram illustrating an example of a hardware implementation for an example scheduling entity 2300 employing a processing system 2314. According to various aspects of the present disclosure, an element or any portion of an element or any combination of elements may be implemented using a processing system 2314 including one or more processors 2304. For example, the scheduling entity 2300 may be such as Figure 1 、 Figure 2 and / or Figure 3 Any one or more of the base stations or scheduling entities shown.

[0161] Processing system 2314 can be used with Figure 20 The processing system 2014 shown is substantially the same and includes a bus interface 2308, a bus 2302, a memory 2305, a processor 2304, and a computer readable medium 2306. In addition, the scheduling entity 2300 may include a user interface 2312 and a transceiver 2310, which are substantially similar to those described above in Figure 20 That is, as used in the scheduling entity 2300, the processor 2304 can be used to implement any one or more of the processes described in this disclosure.

[0162] In some aspects of the present disclosure, processor 2304 may include processing circuitry 2340 configured for various data and signal processing functions used in wireless communications (e.g., including the functions and processes described in this disclosure). Processor 2304 may also include communication circuitry 2342 configured for various functions, including, for example, uplink and downlink communication functions and processes via transceiver 2310. In some examples, transceiver 2310 may be coupled to antenna array 2311, which includes one or more antennas configured for uplink and / or downlink communications (e.g., SRS communications using antenna switching).

[0163] In one or more examples, the computer-readable storage medium 2306 may include software configured for various functions, including the functions and processes described in this disclosure. In some aspects of the present disclosure, the computer-readable storage medium 2306 may include processing instructions 2352 configured for various data and signal processing functions used in wireless communications, including, for example, the functions and processes described in this disclosure. The computer-readable storage medium 2306 may also include communication instructions 2354 configured for various functions, including, for example, uplink and downlink communication functions (e.g., SRS communication with antenna switching).

[0164] Figure 24 is a flow chart illustrating an example process 2400 for wireless communication using MACCE between a scheduling entity and a scheduled entity according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required for implementation of all embodiments. In some examples, the process 2400 may be performed by Figure 23 In some examples, process 2400 can be performed by any suitable device or unit for performing the functions or algorithms described below.

[0165] At block 2402, a scheduling entity (e.g., a gNB) sends a medium access control (MAC) control element (CE) to a scheduled entity (e.g., a UE). The MAC CE includes information for controlling (e.g., activating or deactivating) one or more sounding reference signal (SRS) resources included in at least one sounding reference signal (SRS) resource set. In some aspects of the present disclosure, the scheduling entity may use the communication circuit 2342 and the transceiver 2310 to send the MAC CE to the scheduled entity in a DL transmission via one or more antennas.

[0166] In some aspects of the present disclosure, the MAC CE may be a combination of the above Figure 5-Figure 19 Any of the MAC CEs described herein. In some examples, the MAC CE may further include an SRS slot offset field configured to indicate a slot offset in the at least one SRS resource set. In some examples, the MAC CE may further include a CSI-RS field configured to indicate a CSI-RS associated with the SRS resource set.

[0167] At block 2404, the scheduling entity receives SRS communications from the scheduled entity using one or more SRS resources included in the at least one SRS resource set based on the information in the MAC CE. In some aspects of the present disclosure, the scheduling entity may use the communication circuit 2342 and the transceiver 2310 to receive SRS communications (e.g., UL SRS with antenna switching) via one or more antennas.

[0168] Figure 25 is a flow chart illustrating an example process 2500 for wireless communication using MACCE between a scheduling entity and a scheduled entity according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required for implementation of all embodiments. In some examples, the process 2500 may be performed by Figure 23 In some examples, process 2500 can be performed by any suitable device or unit for performing the functions or algorithms described below.

[0169] At block 2502, a scheduling entity (e.g., a gNB) sends a MAC CE to a scheduled entity (UE). In some aspects of the present disclosure, the scheduling entity may use communication circuitry 2342 and transceiver 2310 to send the MAC CE to the scheduled entity in a DL transmission via one or more antennas. In some aspects of the present disclosure, the MAC CE includes an SRS resource set field configured to indicate an SRS resource set for SRS communication and a CSI-RS field configured to indicate a CSI-RS associated with the SRS resource set.

[0170] At block 2504, the scheduling entity transmits the CSI-RS associated with the SRS resource set to the scheduled entity. The scheduling entity may use the communication circuitry 2342 and the transceiver 2310 to transmit the CSI-RS associated with the SRS resource set to the scheduled entity (e.g., UE) via one or more antennas.

[0171] In one configuration, the apparatus 2000 and / or 2300 for wireless communication includes various means for performing the functions and processes described in the present disclosure. In one aspect, the aforementioned means may be Figure 20 / Figure 23 The processor 2004 / 2304 shown in FIG is configured to execute the functions described by the aforementioned units. In another aspect, the aforementioned units may be circuits or any devices configured to execute the functions described by the aforementioned units.

[0172] Of course, in the above examples, the circuits included in the processor 2004 / 2304 are only provided as examples, and other units for performing the functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 2006 / 2306, or Figure 1 、 Figure 2 and / or Figure 3 and any other suitable means as described in any of the foregoing. Figure 20 、 Figure 21 、 Figure 24 and / or Figure 25 Describe the process and / or algorithm.

[0173] Some aspects of wireless communication networks are presented with reference to exemplary implementations. As those skilled in the art will readily appreciate, various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures, and communication standards.

[0174] For example, various aspects may be implemented in other systems specified by 3GPP, such as Long Term Evolution (LTE), Evolved Packet System (EPS), Universal Mobile Telecommunications System (UMTS), and / or Global System for Mobile Communications (GSM). Various aspects may also be extended to systems specified by the 3rd Generation Partnership Project 2 (3GPP2), such as CDMA2000 and / or Evolution-Data Optimized (EV-DO). Other examples may be implemented in systems using IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth, and / or other suitable systems. The actual telecommunication standard, network architecture, and / or communication standard used depends on the specific application and all design constraints imposed on the system.

[0175] As used herein, the word "exemplary" means "serving as an example, instance, or illustration." Any implementation or aspect described herein as "exemplary" should not be construed as preferred or advantageous over other aspects of the disclosure. Similarly, the term "aspect" does not require that all aspects of the disclosure include the features, advantages, or modes of operation discussed. The term "coupled" is used herein to refer to a direct or indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C can still be considered to be coupled to each other, even if they are not in direct physical contact with each other. For example, a first object can be coupled to a second object, even if the first object has never been in direct physical contact with the second object. The terms "circuit" and "electronic circuit" are used broadly and are intended to include hardware implementations of electronic devices and conductors (wherein, when connected and configured, these electronic devices and conductors enable the execution of the functions described in the disclosure, without limiting the type of electronic circuit) and software implementations of information and instructions (wherein, when these information and instructions are executed by a processor, the execution of the functions described in the disclosure).

[0176] Can Figure 1-Figure 25 One or more of the components, steps, features, and / or functions shown in the drawings may be rearranged and / or combined into a single component, step, feature, or function, or may be embodied in several components, steps, or functions. In addition, additional elements, components, steps, and / or functions may be added without departing from the novel features disclosed herein. Figure 1-Figure 25 The devices, apparatuses and / or components shown in the can be configured to perform one or more of the methods, features or steps described herein. The novel algorithms described herein can also be efficiently implemented using software and / or embedded in hardware.

[0177] It should be understood that the specific order or hierarchy of steps in the disclosed methods is merely an illustration of exemplary processes. It should be understood that the specific order or hierarchy of steps in these methods may be rearranged based on design preferences. The accompanying method claims present elements of the various steps in an example order and are not intended to be limited to the specific order or hierarchy presented unless expressly stated herein.

[0178] The foregoing description is provided to enable anyone of ordinary skill in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to one of ordinary skill in the art, and the overall principles defined herein may also apply to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown herein, but rather to the full scope consistent with the language of the claims, wherein, unless otherwise specified, reference to an element in the singular is not intended to mean "one and only one," but rather "one or more." Unless otherwise specified, the term "some" refers to one or more. A phrase referring to "at least one of" a list item refers to any combination of these items, including individual members. For example, "at least one of a, b, or c" is intended to cover: a; b; c; a and b; a and c; b and c; and a and b and c. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure are expressly incorporated herein by reference and are intended to be covered by the claims, as are known or later known to those of ordinary skill in the art. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

Claims

1. A method for wireless communication at a scheduled entity, comprising: receiving a medium access control (MAC) control element (CE) from a network, the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set, wherein the MAC CE further includes an SRS slot offset field configured to indicate a slot offset between triggering downlink control information (DCI) and the at least one SRS resource set being activated; and Based on the information of the MAC CE, SRS communication is sent using the one or more SRS resources included in the at least one SRS resource set.

2. The method according to claim 1, wherein The MAC CE further includes: A content field is configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field.

3. The method according to claim 1, wherein The MAC CE further includes: A channel state information reference signal (CSI-RS) field is configured to indicate a CSI-RS associated with the at least one SRS resource set.

4. The method according to claim 1, wherein The MAC CE includes: An SRS resource set field configured to indicate an SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the at least one SRS resource set.

5. The method according to claim 4, wherein The SRS resource field is configured to activate or deactivate the one or more SRS resources according to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the at least one SRS resource set.

6. The method according to claim 1, wherein The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the activated SRS resource set in the at least one SRS resource set based on the SRS resource set bitmap.

7. The method according to claim 6, wherein: The SRS resource field is configured to activate or deactivate the one or more SRS resources according to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the activated SRS resource set.

8. The method according to claim 1, wherein The MAC CE includes: a downlink control information (DCI) code point bitmap configured to indicate DCI code points for triggering one or more activations of aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, configured to indicate an SRS resource set in the at least one SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the SRS resource set.

9. The method according to claim 8, wherein The SRS resource field is configured to activate or deactivate the one or more SRS resources according to the one or more activated DCI code points.

10. The method according to claim 1, wherein The MAC CE includes: an SRS resource set field configured to indicate an SRS resource set in the at least one SRS resource set; and A plurality of SRS resource triggering status fields are associated with the SRS resource set, and the plurality of SRS resource triggering status fields are configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling.

11. The method according to claim 10, wherein: The multiple SRS resource triggering status fields respectively correspond to multiple downlink control information (DCI) code points for triggering aperiodic, semi-persistent or periodic SRS resources included in the SRS resource set.

12. The method according to claim 10, wherein: Each of the plurality of SRS resource triggering states indicates activation or deactivation of each of the one or more SRS resources for the SRS resource set.

13. The method according to claim 1, wherein The MAC CE includes: an SRS resource set field configured to indicate an SRS resource set in the at least one SRS resource set; and An SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state of the SRS resource set among a plurality of SRS triggering states preconfigured by radio resource control signaling.

14. The method according to claim 13, wherein The activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the SRS resource set.

15. The method according to claim 1, wherein The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and A plurality of SRS resource triggering status fields are associated with the corresponding SRS resource set, and the plurality of SRS resource triggering status fields are configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling.

16. The method according to claim 15, wherein The multiple SRS resource triggering status fields respectively correspond to multiple downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

17. The method according to claim 1, wherein The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and An SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state of the corresponding SRS resource set among a plurality of SRS triggering states preconfigured by radio resource control signaling.

18. The method according to claim 17, wherein: The activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

19. The method according to claim 1, wherein The MAC CE includes: a downlink control information (DCI) code point bitmap configured to indicate DCI code points for triggering one or more activations of aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, configured to indicate an SRS resource set in the at least one SRS resource set; and One or more SRS resource triggering status fields are associated with the SRS resource set, each SRS resource triggering status field being configured to indicate a resource triggering status preconfigured by radio resource control signaling.

20. The method according to claim 19, wherein Each of the one or more SRS resource triggering status fields corresponds to one of the activated DCI code points.

21. A method of scheduling wireless communications at an entity, comprising: sending a medium access control (MAC) control element (CE) to a user equipment (UE), the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set, wherein the MAC CE further includes an SRS slot offset field configured to indicate a slot offset between triggering downlink control information (DCI) and the at least one SRS resource set being activated; and Based on the information of the MAC CE, SRS communication is received from the UE using the one or more SRS resources included in the at least one SRS resource set.

22. The method according to claim 21, wherein The MAC CE further includes: A content field is configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field.

23. The method according to claim 21, wherein The MAC CE further includes: A channel state information reference signal (CSI-RS) field is configured to indicate a CSI-RS associated with the at least one SRS resource set.

24. An apparatus for wireless communication at a scheduled entity, comprising: Memory; as well as a processor coupled to the memory, wherein the processor is configured to: receiving a medium access control (MAC) control element (CE) from a network, the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set, wherein the MAC CE further includes an SRS slot offset field configured to indicate a slot offset between triggering downlink control information (DCI) and the at least one SRS resource set being activated; and Based on the information of the MAC CE, SRS communication is sent using the one or more SRS resources included in the at least one SRS resource set.

25. The apparatus according to claim 24, wherein The MAC CE further includes: A content field is configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field.

26. The apparatus according to claim 24, wherein The MAC CE further includes: A channel state information reference signal (CSI-RS) field is configured to indicate a CSI-RS associated with the at least one SRS resource set.

27. The apparatus according to claim 24, wherein The MAC CE includes: An SRS resource set field configured to indicate an SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the at least one SRS resource set.

28. The apparatus according to claim 27, wherein The SRS resource field is configured to activate or deactivate the one or more SRS resources according to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the at least one SRS resource set.

29. The apparatus according to claim 24, wherein The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the activated SRS resource set in the at least one SRS resource set based on the SRS resource set bitmap.

30. The apparatus according to claim 29, wherein The SRS resource field is configured to activate or deactivate the one or more SRS resources according to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the activated SRS resource set.

31. The apparatus according to claim 24, wherein The MAC CE includes: a downlink control information (DCI) code point bitmap configured to indicate DCI code points for triggering one or more activations of aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, configured to indicate an SRS resource set in the at least one SRS resource set; and The SRS resource field is configured to indicate the one or more SRS resources included in the SRS resource set.

32. The apparatus according to claim 31, wherein The SRS resource field is configured to activate or deactivate the one or more SRS resources according to the one or more activated DCI code points.

33. The apparatus of claim 24, wherein: The MAC CE includes: an SRS resource set field configured to indicate an SRS resource set in the at least one SRS resource set; and A plurality of SRS resource triggering status fields are associated with the SRS resource set, and the plurality of SRS resource triggering status fields are configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling.

34. The apparatus according to claim 33, wherein The multiple SRS resource triggering status fields respectively correspond to multiple downlink control information (DCI) code points for triggering aperiodic, semi-persistent or periodic SRS resources included in the SRS resource set.

35. The apparatus of claim 33, wherein: Each of the plurality of SRS resource triggering states indicates activation or deactivation of each of the one or more SRS resources for the SRS resource set.

36. The apparatus of claim 24, wherein: The MAC CE includes: an SRS resource set field configured to indicate an SRS resource set in the at least one SRS resource set; and An SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state of the SRS resource set among a plurality of SRS triggering states preconfigured by radio resource control signaling.

37. The apparatus according to claim 36, wherein The activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the SRS resource set.

38. The apparatus of claim 24, wherein: The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and A plurality of SRS resource triggering status fields are associated with the corresponding SRS resource set, and the plurality of SRS resource triggering status fields are configured to indicate a plurality of SRS resource triggering states pre-configured by radio resource control signaling.

39. The apparatus according to claim 38, wherein The multiple SRS resource triggering status fields respectively correspond to multiple downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

40. The apparatus of claim 24, wherein The MAC CE includes: an SRS resource set bitmap comprising a plurality of bits, each bit being configured to indicate activation or deactivation of a corresponding SRS resource set in the at least one SRS resource set; and An SRS triggering state bitmap, wherein each bit indicates activation or deactivation of a corresponding SRS triggering state of the corresponding SRS resource set among a plurality of SRS triggering states preconfigured by radio resource control signaling.

41. The apparatus according to claim 40, wherein The activated SRS triggering state corresponds to a plurality of downlink control information (DCI) code points for triggering aperiodic, semi-persistent, or periodic SRS resources included in the corresponding activated SRS resource set.

42. The apparatus of claim 24, wherein: The MAC CE includes: a downlink control information (DCI) code point bitmap configured to indicate DCI code points for triggering one or more activations of aperiodic, semi-persistent, or periodic SRS; an SRS resource set field associated with the DCI code point bitmap, configured to indicate an SRS resource set in the at least one SRS resource set; and One or more SRS resource triggering status fields are associated with the SRS resource set, each SRS resource triggering status field being configured to indicate a resource triggering status preconfigured by radio resource control signaling.

43. The apparatus according to claim 42, wherein Each of the one or more SRS resource triggering status fields corresponds to one of the activated DCI code points.

44. An apparatus for wireless communication at a scheduling entity, comprising: Memory; as well as a processor coupled to the memory, wherein the processor is configured to: sending a medium access control (MAC) control element (CE) to a user equipment (UE), the MAC CE including information for activating or deactivating one or more sounding reference signal (SRS) resources included in at least one SRS resource set, wherein the MAC CE further includes an SRS slot offset field configured to indicate a slot offset between triggering downlink control information (DCI) and the at least one SRS resource set being activated; and Based on the information of the MAC CE, SRS communication is received from the UE using the one or more SRS resources included in the at least one SRS resource set.

45. The apparatus of claim 44, wherein: The MAC CE further includes: A content field is configured to indicate an alternative value represented by the SRS slot offset field according to a value of the content field.

46. ​​The apparatus of claim 44, wherein: The MAC CE further includes: A channel state information reference signal (CSI-RS) field is configured to indicate a CSI-RS associated with the at least one SRS resource set.

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