Synchronization signaling in cell discontinuous communications
Patent Information
- Application Number
- PCT/CN2024/073582
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-07-31
Smart Images

Figure CN2024073582_31072025_PF_FP_ABST
Abstract
Description
SYNCHRONIZATION SIGNALING IN CELL DISCONTINUOUS COMMUNICATIONS
[0001] INTRODUCTION
[0002] Field of the Disclosure
[0003] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for communicating synchronization signals for cell discontinuous communications.
[0004] Description of Related Art
[0005] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users.
[0006] Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and type of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others.SUMMARY
[0007] One aspect provides a method for wireless communications by an apparatus. The method includes obtaining an indication to activate a first configuration for cell discontinuous transmission (DTX) , wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; obtaining a first reference signal via the cell during the second time period; and communicating with a network entity based at least in part on one or more measurements associated with the first reference signal.
[0008] Another aspect provides a method for wireless communications by an apparatus. The method includes sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; sending a first reference signal via the cell during the second time period; and communicating with a user equipment based at least in part the first reference signal.
[0009] Another aspect provides a method for wireless communications by an apparatus. The method includes obtaining an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; and refraining from monitoring for a first reference signal via the cell during the second time period in response to the first configuration being activated.
[0010] Another aspect provides a method for wireless communications by an apparatus. The method includes sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; and refraining from sending a first reference signal via the cell during the second time period in response to the first configuration being activated.
[0011] Another aspect provides a method for wireless communications by an apparatus. The method includes obtaining a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal; sending a request for the on-demand reference signal; obtaining the on-demand reference signal in a time window; and refraining from monitoring for the reference signal in the time window in response to sending the request.
[0012] Another aspect provides a method for wireless communications by an apparatus. The method includes sending a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal; obtaining a request for the on-demand reference signal; sending the on-demand reference signal in a time window; and refraining from sending the reference signal in the time window in response to sending the on-demand reference signal.
[0013] Other aspects provide: one or more apparatuses operable, configured, or otherwise adapted to perform any portion of any method described herein (e.g., such that performance may be by only one apparatus or in a distributed fashion across multiple apparatuses) ; one or more non-transitory, computer-readable media comprising instructions that, when executed by one or more processors of one or more apparatuses, cause the one or more apparatuses to perform any portion of any method described herein (e.g., such that instructions may be included in only one computer-readable medium or in a distributed fashion across multiple computer-readable media, such that instructions may be executed by only one processor or by multiple processors in a distributed fashion, such that each apparatus of the one or more apparatuses may include one processor or multiple processors, and / or such that performance may be by only one apparatus or in a distributed fashion across multiple apparatuses) ; one or more computer program products embodied on one or more computer-readable storage media comprising code for performing any portion of any method described herein (e.g., such that code may be stored in only one computer-readable medium or across computer-readable media in a distributed fashion) ; and / or one or more apparatuses comprising one or more means for performing any portion of any method described herein (e.g., such that performance would be by only one apparatus or by multiple apparatuses in a distributed fashion) . By way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks. An apparatus may comprise one or more memories; and one or more processors configured to cause the apparatus to perform any portion of any method described herein. In some examples, one or more of the processors may be preconfigured to perform various functions or operations described herein without requiring configuration by software.
[0014] The following description and the appended figures set forth certain features for purposes of illustration.BRIEF DESCRIPTION OF DRAWINGS
[0015] The appended figures depict certain features of the various aspects described herein and are not to be considered limiting of the scope of this disclosure.
[0016] FIG. 1 depicts an example wireless communications network.
[0017] FIG. 2 depicts an example disaggregated base station architecture.
[0018] FIG. 3 depicts aspects of an example base station and an example user equipment (UE) .
[0019] FIGS. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communications network.
[0020] FIG. 5 illustrates an example of synchronization signal communications.
[0021] FIG. 6 illustrates an example synchronization signal block in time-frequency domains.
[0022] FIGS. 7A-7C illustrate example discovery reference signals (DRSs) in time-frequency domains.
[0023] FIG. 8 illustrates an example of certain synchronization signaling for a cell discontinuous transmission (DTX) cycle.
[0024] FIG. 9 illustrates an example of certain cell wake-up signaling for a cell discontinuous reception (DRX) cycle.
[0025] FIG. 10 depicts a process flow for synchronization signaling in cell discontinuous communications.
[0026] FIG. 11 depicts an example of DRS termination.
[0027] FIG. 12 depicts a process flow for DRS termination in a wireless communications system.
[0028] FIG. 13 depicts a method for wireless communications.
[0029] FIG. 14 depicts another method for wireless communications.
[0030] FIG. 15 depicts another method for wireless communications.
[0031] FIG. 16 depicts another method for wireless communications.
[0032] FIG. 17 depicts another method for wireless communications.
[0033] FIG. 18 depicts another method for wireless communications.
[0034] FIG. 19 depicts aspects of an example communications device.
[0035] FIG. 20 depicts aspects of an example communications device.DETAILED DESCRIPTION
[0036] Aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable mediums for communicating synchronization signals for cell discontinuous communications.
[0037] In certain wireless communication systems (e.g., 5G New Radio (NR) and any future wireless communication system) , a network entity (e.g., a base station) may communicate with a user equipment (UE) via a cell, which may correspond to a specific carrier frequency and / or coverage area of one or more transmission-reception points (TRPs) of the network entity. In order to implement energy savings for wireless communications, the network entity may configure certain time periods where a cell is active and non-active for downlink and / or uplink traffic. For example, during a cell discontinuous transmission (DTX) cycle, there is an active time period during which the network entity can transmit downlink traffic via the cell, and a non-active time period during which the network entity refrains from transmitting certain downlink traffic via the cell. The network entity may inform the UE of the cell DTX cycle, which may recur with a periodicity upon activation of the cell DTX cycle. In response to the cell DTX cycle being activated, the UE may also refrain monitoring for certain downlink traffic via the cell in the non-active time period. Likewise, during a cell discontinuous reception (DRX) cycle, there is an active time period during which the network entity can receive uplink traffic via the cell, and a non-active time period during which the network entity refrains from receiving certain uplink traffic via the cell. In response to a cell DRX cycle being activated, the UE may also refrain sending certain uplink traffic via the cell in the non-active time period. Accordingly, for cell DTX / DRX cycles, the respective terms transmission and reception derive their meaning from the perspective of the network entity (e.g., a base station, TRP, any disaggregated entity thereof, etc. ) .
[0038] Technical problems for cell DTX / DRX cycle (s) include, for example, how to apply the respective non-active time periods to certain synchronization signals. A network entity may transmit time-frequency synchronization and / or cell acquisition information via certain synchronization signals and / or a broadcast channel. As an example, the network entity may transmit this information in a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) , and a physical broadcast channel (PBCH) in a synchronization signal / physical broadcast channel block (SSB) , which is further described herein with respect to FIG. 6. In some cases, the network entity may be configured to transmit an SSB in response to a request from a UE, for example, in order to reduce energy consumption and / or channel usage on broadcast channel communications. Such an SSB may be referred to as an on-demand SSB. In order to facilitate an on-demand SSB and continue to provide synchronization information, the network entity may periodically transmit certain synchronization signals, for example, in a discovery reference signal (DRS) . The DRS may carry one or more synchronization signals and / or a configuration for requesting the on-demand SSB, for example, via a cell-wake-up-signal (C-WUS) in an uplink channel. In some cases, the DRS may be transmitted without the PBCH or reduced system information, and thus, a DRS transmission may consume less energy and channel capacity than an SSB. Accordingly, the network entity may transmit the DRS periodically and an on-demand SSB in response to a C-WUS from a UE. However, in certain wireless communication systems (e.g., 5G NR and any future wireless communication system) , it is not established how to apply the non-active time period associated with cell DTX / DRX cycles to the DRS, on-demand SSB, and / or C-WUS.
[0039] Aspects described herein overcome the aforementioned technical problem (s) by providing certain schemes for communicating synchronization signals in cell DTX / DRX cycles, and more particularly, in the respective non-active time periods. In certain aspects, the network entity may send the DRS in the non-active time period of a cell DTX cycle. In certain cases, the periodicity of the DRS may increase in the non-active time period of the cell DTX cycle. In certain aspects, the network entity may refrain from sending the DRS in the non-active time period of the cell DTX cycle. For the C-WUS, the network entity may monitor for any C-WUSs in the non-active time period of a cell DRX cycle, and thus, a UE may be permitted to request an on-demand SSB in the non-active time period of the cell DRX cycle. In certain aspects, the network entity may refrain from monitoring for any C-WUSs in the non-active time period of the cell DRX cycle. For the on-demand SSB, the network entity may send the on-demand SSB in the non-active time period of a cell DTX cycle. In certain aspects, the network entity may send the on-demand SSB if the on-demand SSB is a cell-defining SSB as further described herein. In certain aspects, the network entity may refrain from sending the on-demand SSB in the non-active time period of the cell DTX cycle.
[0040] The schemes for communicating synchronization signals in cell DTX / DRX cycles described herein may provide various beneficial effects and / or advantages. The techniques for communicating synchronization signals in cell DTX / DRX cycles may enable improved wireless communication performance, such as increased channel capacity and / or reduced energy consumption at a network entity and / or UE. The improved wireless communication performance may be attributable to the reduced energy consumption and / or channel usage used for DRS and / or on-demand SSB transmissions described herein.
[0041] In certain aspects, communication of the DRS in a non-active time period of a cell DTX cycle may allow UE (s) to perform various wireless communications operations, such as time-frequency synchronization, path loss measurements, channel estimation, beam management (including beam refinement, beam failure detection, beam selection, etc. ) , etc. Accordingly, the transmission of the DRS in a non-active time period of a cell DTX cycle may enable improved wireless communication performance due to the performance of the various wireless communications operations described above. In certain aspects, dropping the DRS and / or on-demand SSB in the non-active time period of a cell DTX cycle may enable power savings at the network entity and / or UE.
[0042] In certain aspects, communication of the C-WUS in a non-active time period of a cell DRX cycle may allow a UE to receive an on-demand SSB and perform cell acquisition with reduced latency. Dropping the C-WUS in the non-active time period of the cell DRX cycle may enable power savings at the network entity and / or UE.
[0043] Introduction to Wireless Communications Networks
[0044] The techniques and methods described herein may be used for various wireless communications networks. While aspects may be described herein using terminology commonly associated with 3G, 4G, 5G, 6G, and / or other generations of wireless technologies, aspects of the present disclosure may likewise be applicable to other communications systems and standards not explicitly mentioned herein.
[0045] FIG. 1 depicts an example of a wireless communications network 100, in which aspects described herein may be implemented.
[0046] Generally, wireless communications network 100 includes various network entities (alternatively, network elements or network nodes) . A network entity is generally a communications device and / or a communications function performed by a communications device (e.g., a user equipment (UE) , a base station (BS) , a component of a BS, a server, etc. ) . As such communications devices are part of wireless communications network 100, and facilitate wireless communications, such communications devices may be referred to as wireless communications devices. For example, various functions of a network as well as various devices associated with and interacting with a network may be considered network entities. Further, wireless communications network 100 includes terrestrial aspects, such as ground-based network entities (e.g., BSs 102) , and non-terrestrial aspects (also referred to herein as non-terrestrial network entities) , such as satellite 140 and / or aerial or spacebome platform (s) , which may include network entities on-board (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and UEs.
[0047] In the depicted example, wireless communications network 100 includes BSs 102, UEs 104, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and 5G Core (5GC) network 190, which interoperate to provide communications services over various communications links, including wired and wireless links.
[0048] FIG. 1 depicts various example UEs 104, which may more generally include: a cellular phone, smart phone, session initiation protocol (SIP) phone, laptop, personal digital assistant (PDA) , satellite radio, global positioning system, multimedia device, video device, digital audio player, camera, game console, tablet, smart device, wearable device, vehicle, electric meter, gas pump, large or small kitchen appliance, healthcare device, implant, sensor / actuator, display, internet of things (IoT) devices, always on (AON) devices, edge processing devices, data centers, or other similar devices. UEs 104 may also be referred to more generally as a mobile device, a wireless device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and others.
[0049] BSs 102 wirelessly communicate with (e.g., transmit signals to or receive signals from) UEs 104 via communications links 120. The communications links 120 between BSs 102 and UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a BS 102 and / or downlink (DL) (also referred to as forward link) transmissions from a BS 102 to a UE 104. The communications links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.
[0050] BSs 102 may generally include: a NodeB, enhanced NodeB (eNB) , next generation enhanced NodeB (ng-eNB) , next generation NodeB (gNB or gNodeB) , access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmission reception point, and / or others. Each of BSs 102 may provide communications coverage for a respective coverage area 110, which may sometimes be referred to as a cell, and which may overlap in some cases (e.g., small cell 102’ may have a coverage area 110’ that overlaps the coverage area 110 of a macro cell) . A BS may, for example, provide communications coverage for a macro cell (covering relatively large geographic area) , a pico cell (covering relatively smaller geographic area, such as a sports stadium) , a femto cell (relatively smaller geographic area (e.g., a home) ) , and / or other types of cells.
[0051] Generally, a cell may refer to a portion, partition, or segment of wireless communication coverage served by a network entity within a wireless communication network. A cell may have geographic characteristics, such as a geographic coverage area, as well as radio frequency characteristics, such as time and / or frequency resources dedicated to the cell. For example, a specific geographic coverage area may be covered by multiple cells employing different frequency resources (e.g., bandwidth parts) and / or different time resources. As another example, a specific geographic coverage area may be covered by a single cell. In some contexts (e.g., a carrier aggregation scenario and / or multi-connectivity scenario) , the terms “cell” or “serving cell” may refer to or correspond to a specific carrier frequency (e.g., a component carrier) used for wireless communications, and a “cell group” may refer to or correspond to multiple carriers used for wireless communications. As examples, in a carrier aggregation scenario, a UE may communicate on multiple component carriers corresponding to multiple (serving) cells in the same cell group, and in a multi-connectivity (e.g., dual connectivity) scenario, a UE may communicate on multiple component carriers corresponding to multiple cell groups.
[0052] While BSs 102 are depicted in various aspects as unitary communications devices, BSs 102 may be implemented in various configurations. For example, one or more components of a base station may be disaggregated, including a central unit (CU) , one or more distributed units (DUs) , one or more radio units (RUs) , a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) , or a Non-Real Time (Non-RT) RIC, to name a few examples. In another example, various aspects of a base station may be virtualized. More generally, a base station (e.g., BS 102) may include components that are located at a single physical location or components located at various physical locations. In examples in which a base station includes components that are located at various physical locations, the various components may each perform functions such that, collectively, the various components achieve functionality that is similar to a base station that is located at a single physical location. In some aspects, a base station including components that are located at various physical locations may be referred to as a disaggregated radio access network architecture, such as an Open RAN (O-RAN) or Virtualized RAN (VRAN) architecture. FIG. 2 depicts and describes an example disaggregated base station architecture.
[0053] Different BSs 102 within wireless communications network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, BSs 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) ) may interface with the EPC 160 through first backhaul links 132 (e.g., an S1 interface) . BSs 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN) ) may interface with 5GC 190 through second backhaul links 184. BSs 102 may communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interface) , which may be wired or wireless.
[0054] Wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other features. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz -7125 MHz, which is often referred to (interchangeably) as “Sub-6 GHz” . Similarly, 3GPP currently defines Frequency Range 2 (FR2) as including 24,250 MHz -71,000 MHz, which is sometimes referred to (interchangeably) as a “millimeter wave” ( “mmW” or “mmWave” ) . In some cases, FR2 may be further defined in terms of sub-ranges, such as a first sub-range FR2-1 including 24,250 MHz -52,600 MHz and a second sub-range FR2-2 including 52,600 MHz -71,000 MHz. A base station configured to communicate using mmWave / near mmWave radio frequency bands (e.g., a mmWave base station such as BS 180) may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.
[0055] The communications links 120 between BSs 102 and, for example, UEs 104, may be through one or more carriers, which may have different bandwidths (e.g., 5, 10, 15, 20, 100, 400, and / or other MHz) , and which may be aggregated in various aspects. Carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) .
[0056] Communications using higher frequency bands may have higher path loss and a shorter range compared to lower frequency communications. Accordingly, certain base stations (e.g., 180 in FIG. 1) may utilize beamforming 182 with a UE 104 to improve path loss and range. For example, BS 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate the beamforming. In some cases, BS 180 may transmit a beamformed signal to UE 104 in one or more transmit directions 182’. UE 104 may receive the beamformed signal from the BS 180 in one or more receive directions 182” . UE 104 may also transmit a beamformed signal to the BS 180 in one or more transmit directions 182” . BS 180 may also receive the beamformed signal from UE 104 in one or more receive directions 182’. BS 180 and UE 104 may then perform beam training to determine the best receive and transmit directions for each of BS 180 and UE 104. Notably, the transmit and receive directions for BS 180 may or may not be the same. Similarly, the transmit and receive directions for UE 104 may or may not be the same.
[0057] Wireless communications network 100 further includes a Wi-Fi AP 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in, for example, a 2.4 GHz and / or 5 GHz unlicensed frequency spectrum.
[0058] Certain UEs 104 may communicate with each other using device-to-device (D2D) communications link 158. D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink control channel (PSCCH) , and / or a physical sidelink feedback channel (PSFCH) .
[0059] EPC 160 may include various functional components, including: a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and / or a Packet Data Network (PDN) Gateway 172, such as in the depicted example. MME 162 may be in communication with a Home Subscriber Server (HSS) 174. MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, MME 162 provides bearer and connection management.
[0060] Generally, user Internet protocol (IP) packets are transferred through Serving Gateway 166, which itself is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation as well as other functions. PDN Gateway 172 and the BM-SC 170 are connected to IP Services 176, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a Packet Switched (PS) streaming service, and / or other IP services.
[0061] BM-SC 170 may provide functions for MBMS user service provisioning and delivery. BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and / or may be used to schedule MBMS transmissions. MBMS Gateway 168 may be used to distribute MBMS traffic to the BSs 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.
[0062] 5GC 190 may include various functional components, including: an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. AMF 192 may be in communication with Unified Data Management (UDM) 196.
[0063] AMF 192 is a control node that processes signaling between UEs 104 and 5GC 190. AMF 192 provides, for example, quality of service (QoS) flow and session management.
[0064] Internet protocol (IP) packets are transferred through UPF 195, which is connected to the IP Services 197, and which provides UE IP address allocation as well as other functions for 5GC 190. IP Services 197 may include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.
[0065] In various aspects, a network entity or network node can be implemented as an aggregated base station, as a disaggregated base station, a component ora base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.
[0066] FIG. 2 depicts an example disaggregated base station 200 architecture. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that can communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a Non-Real Time (Non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) Framework 205, or both) . A CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DUs 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RUs 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 240.
[0067] Each of the units, e.g., the CUs 210, the DUs 230, the RUs 240, as well as the Near-RT RICs 225, the Non-RT RICs 215 and the SMO Framework 205, may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communications interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally or alternatively, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
[0068] In some aspects, the CU 210 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC) , packet data convergence protocol (PDCP) , service data adaptation protocol (SDAP) , or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 210. The CU 210 may be configured to handle user plane functionality (e.g., Central Unit -User Plane (CU-UP) ) , control plane functionality (e.g., Central Unit -Control Plane (CU-CP) ) , or a combination thereof. In some implementations, the CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP trait via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 210 can be implemented to communicate with the DU 230, as necessary, for network control and signaling.
[0069] The DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. In some aspects, the DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rd Generation Partnership Project (3GPP) . In some aspects, the DU 230 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 230, or with the control functions hosted by the CU 210.
[0070] Lower-layer functionality can be implemented by one or more RUs 240. In some deployments, an RU 240, controlled by a DU 230, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like) , or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU (s) 240 can be implemented to handle over the air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU (s) 240 can be controlled by the corresponding DU 230. In some scenarios, this configuration can enable the DU (s) 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0071] The SMO Framework 205 may be configured to support RAN deployment and provisioning ofnon-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an O 1 interface) . For virtualized network elements, the SMO Framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface) . Such virtualized network elements can include, but are not limited to, CUs 210, DUs 230, RUs 240 and Near-RT RICs 225. In some implementations, the SMO Framework 205 can communicate with a hardware aspect ofa 4G RAN, such as an open eNB (O-eNB) 211, via an O1 interface. Additionally, in some implementations, the SMO Framework 205 can communicate directly with one or more DUs 230 and / or one or more RUs 240 via an O1 interface. The SMO Framework 205 also may include a Non-RT RIC 215 configured to support functionality of the SMO Framework 205.
[0072] The Non-RT RIC 215 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near-RT RIC 225. The Non-RT RIC 215 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 225. The Near-RT RIC 225 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, or both, as well as an O-eNB, with the Near-RT RIC 225.
[0073] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 225, the Non-RT RIC 215 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 225 and may be received at the SMO Framework 205 or the Non-RT RIC 215 from non-network data sources or from network functions. In some examples, the Non-RT RIC 215 or the Near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 215 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 205 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies) .
[0074] FIG. 3 depicts aspects of an example BS 102 and a UE 104.
[0075] Generally, BS 102 includes various processors (e.g., 318, 320, 330, 338, and 340) , antennas 334a-t (collectively 334) , transceivers 332a-t (collectively 332) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 314) . For example, BS 102 may send and receive data between BS 102 and UE 104. BS 102 includes controller / processor 340, which may be configured to implement various functions described herein related to wireless communications. Note that the BS 102 may have a disaggregated architecture as described herein with respect to FIG. 2.
[0076] Generally, UE 104 includes various processors (e.g., 358, 364, 366, 370, and 380) , antennas 352a-r (collectively 352) , transceivers 354a-r (collectively 354) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., retrieved from data source 362) and wireless reception of data (e.g., provided to data sink 360) . UE 104 includes controller / processor 380, which may be configured to implement various functions described herein related to wireless communications.
[0077] In regards to an example downlink transmission, BS 102 includes a transmit processor 320 that may receive data from a data source 312 and control information from a controller / processor 340. The control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , and / or others. The data may be for the physical downlink shared channel (PDSCH) , in some examples.
[0078] Transmit processor 320 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 320 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , PBCH demodulation reference signal (DMRS) , and channel state information reference signal (CSI-RS) .
[0079] Transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a-332t may process a respective output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 332a-332t may be transmitted via the antennas 334a-334t, respectively.
[0080] In order to receive the downlink transmission, UE 104 includes antennas 352a-352r that may receive the downlink signals from the BS 102 and may provide received signals to the demodulators (DEMODs) in transceivers 354a-354r, respectively. Each demodulator in transceivers 354a-354r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples to obtain received symbols.
[0081] RX MIMO detector 356 may obtain received symbols from all the demodulators in transceivers 354a-354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.
[0082] In regards to an example uplink transmission, UE 104 further includes a transmit processor 364 that may receive and process data (e.g., for the PUSCH) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH) ) from the controller / processor 380. Transmit processor 364 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) . The symbols from the transmit processor 364 may be precoded by a TX MIMO processor 366 if applicable, further processed by the modulators in transceivers 354a-354r (e.g., for SC-FDM) , and transmitted to BS 102.
[0083] At BS 102, the uplink signals from UE 104 may be received by antennas 334a-t, processed by the demodulators in transceivers 332a-332t, detected by a RX MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information sent by UE 104. Receive processor 338 may provide the decoded data to a data sink 314 and the decoded control information to the controller / processor 340.
[0084] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.
[0085] Scheduler 344 may schedule UEs for data transmission on the downlink and / or uplink.
[0086] In various aspects, BS 102 may be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 312, scheduler 344, memory 342, transmit processor 320, controller / processor 340, TX MIMO processor 330, transceivers 332a-t, antenna 334a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 334a-t, transceivers 332a-t, RX MIMO detector 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.
[0087] In various aspects, UE 104 may likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 362, memory 382, transmit processor 364, controller / processor 380, TX MIMO processor 366, transceivers 354a-t, antenna 352a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 352a-t, transceivers 354a-t, RX MIMO detector 356, controller / processor 380, receive processor 358, memory 382, and / or other aspects described herein.
[0088] In some aspects, a processor may be configured to perform various operations, such as those associated with the methods described herein, and transmit (output) to or receive (obtain) data from another interface that is configured to transmit or receive, respectively, the data.
[0089] In various aspects, artificial intelligence (AI) processors 318 and 370 may perform AI processing for BS 102 and / or UE 104, respectively. The AI processor 318 may include AI accelerator hardware or circuitry such as one or more neural processing units (NPUs) , one or more neural network processors, one or more tensor processors, one or more deep learning processors, etc. The AI processor 370 may likewise include AI accelerator hardware or circuitry. As an example, the AI processor 370 may perform AI-based beam management, AI-based channel state feedback (CSF) , AI-based antenna tuning, and / or AI-based positioning (e.g., non-line of sight positioning prediction) . In some cases, the AI processor 318 may process feedback from the UE 104 (e.g., CSF) using hardware accelerated AI inferences and / or AI training. The AI processor 318 may decode compressed CSF from the UE 104, for example, using a hardware accelerated AI inference associated with the CSF. In certain cases, the AI processor 318 may perform certain RAN-based functions including, for example, network planning, network performance management, energy-efficient network operations, etc.
[0090] FIGS. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, such as wireless communications network 100 of FIG. 1.
[0091] In particular, FIG. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, FIG. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, FIG. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and FIG. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.
[0092] Wireless communications systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such systems may also support half-duplex operation using time division duplexing (TDD) . OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth (e.g., as depicted in FIGS. 4B and 4D) into multiple orthogonal subcarriers. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and / or in the time domain with SC-FDM.
[0093] A wireless communications frame structure may be frequency division duplex (FDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for either DL or UL. Wireless communications frame structures may also be time division duplex (TDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for both DL and UL.
[0094] In FIG. 4A and 4C, the wireless communications frame structure is TDD where D is DL, U is UL, and X is flexible for use between DL / UL. UEs may be configured with a slot format through a received slot format indicator (SFI) (dynamically through DL control information (DCI) , or semi-statically / statically through radio resource control (RRC) signaling) . In the depicted examples, a 10 ms frame is divided into 10 equally sized 1 ms subframes. Each subframe may include one or more time slots. In some examples, each slot may include 12 or 14 symbols, depending on the cyclic prefix (CP) type (e.g., 12 symbols per slot for an extended CP or 14 symbols per slot for a normal CP) . Subframes may also include mini-slots, which generally have fewer symbols than an entire slot. Other wireless communications technologies may have a different frame structure and / or different channels.
[0095] In certain aspects, the number of slots within a subframe (e.g., a slot duration in a subframe) is based on a numerology, which may define a frequency domain subcarrier spacing and symbol duration as further described herein. In certain aspects, given a numerology μ, there are 2μ slots per subframe. Thus, numerologies (μ) 0 to 6 may allow for 1, 2, 4, 8, 16, 32, and 64 slots, respectively, per subframe. In some cases, the extended CP (e.g., 12 symbols per slot) may be used with a specific numerology, e.g., numerology 2 allowing for 4 slots per subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing may be equal to 2μ x 15 kHz, where μ is the numerology 0 to 6. As an example, the numerology μ = 0 corresponds to a subcarrier spacing of 15 kHz, and the numerology μ = 6 corresponds to a subcarrier spacing of 960 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIGS. 4A, 4B, 4C, and 4D provide an example of a slot format having 14 symbols per slot (e.g., a normal CP) and a numerology μ = 2 with 4 slots per subframe. In such a case, the slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.
[0096] As depicted in FIGS. 4A, 4B, 4C, and 4D, a resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme including, for example, quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM) .
[0097] As illustrated in FIG. 4A, some of the REs carry reference (pilot) signals (RS) for a UE (e.g., UE 104 of FIGS. 1 and 3) . The RS may include demodulation RS (DMRS) and / or channel state information reference signals (CSI-RS) for channel estimation at the UE.The RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and / or phase tracking RS (PT-RS) .
[0098] FIG. 4B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including, for example, nine RE groups (REGs) , each REG including, for example, four consecutive REs in an OFDM symbol.
[0099] A primary synchronization signal (PSS) may be within symbol 2 of particular subframes ora frame. The PSS is used by a UE (e.g., 104 of FIGS. 1 and 3) to determine subframe / symbol timing and a physical layer identity.
[0100] A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
[0101] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DMRS. The physical broadcast channel (PBCH) , which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (SSB) , and in some cases, referred to as a synchronization signal block (SSB) . The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and / or paging messages.
[0102] As illustrated in FIG. 4C, some of the REs carry DMRS (indicated as R for one particular configuration, but other DMRS configurations are possible) for channel estimation at the base station. The UE may transmit DMRS for the PUCCH and DMRS for the PUSCH. The PUSCH DMRS may be transmitted, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. UE 104 may transmit sounding reference signals (SRS) . The SRS may be transmitted, for example, in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
[0103] FIG. 4D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK / NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and / or UCI.
[0104] Example Synchronization Signal Communications
[0105] FIG. 5 illustrates an example of synchronization signal communications 500 using a DRS, C-WUS, and an on-demand SSB via downlink (DL) and an uplink (UL) channels. In this example, a network entity (e.g., the BS 102) sends a DRS 502 periodically in accordance with a periodicity 504. The periodicity 504 may be five milliseconds (ms) , 10 ms, 20 ms, 40 ms, 80 ms, or 160 ms, for example. The DRS 502 may include one or more synchronization signals, in some cases without a PBCH or certain system information, for example, as further described herein with respect to FIGS. 7A-7C. A UE (e.g., the UE 104) may use the DRS 502 for time-frequency synchronization and / or channel state measurements (e.g., path loss estimation) . In certain aspects, the DRS 502 may carry a configuration for a C-WUS 506. For example, the DRS 502 may indicate one or more transmission occasions (including time-frequency resource (s) ) for a UE to send the C-WUS 506 to request an on-demand SSB 508. The UE sends the C-WUS 506 that indicates to the network entity to send the on-demand SSB 508. The network entity sends the on-demand SSB 508 in response to the C-WUS 506. Note that the on-demand SSB 508 may be representative of certain on-demand system information (e.g., the MIB and / or SIB1) that may not be conveyed via the DRS 502.
[0106] FIG. 6 illustrates an example SSB 600 in time-frequency domains. In this example, the SSB 600 occupies twenty resource blocks 602 in the frequency domain and 4 symbols 604a-d (collectively “the symbols 604” ) in the time domain. The symbols 604 may form a sequence of consecutive symbols. The SSB 600 may have a center frequency 606 that corresponds to a global synchronization channel number (GSCN) and an SSREF (e.g., a specific frequency position of an SSB) according to a synchronization raster as specified in a wireless communications standard, such as 3GPP technical specifications. The SSB 600 may include a primary synchronization signal (PSS) 608, a secondary synchronization signal (SSS) 610, and a physical broadcast channel (PBCH) 612. The PSS 608 occupies a first portion of the resource blocks 602 (e.g., 127 subcarriers) in the first symbol 604a; the SSS 610 occupies the first portion of the resource blocks 602 (e.g., 127 subcarriers) in the third symbol 604c; the PBCH 612 occupies the resource blocks 602 in the second symbol 604b and the fourth symbol 604d; and the PBCH 612 occupies a second portion of the resource blocks 602 (e.g., 8 resource blocks) in the fourth symbol 604c. Thus, there may be empty time-frequency resources 614 arranged in the first symbol 604a and the third symbol 604c. Note that the SSB 600 is merely an example structure for synchronization signaling, and other structures (e.g., different time and / or frequency domain arrangements for the PSS, SSS, and / or PBCH) may be used in addition to or instead of the structure depicted for the SSB 600. In some cases, synchronization signaling may be conveyed via a discovery reference signal (DRS) having one or more synchronization signals, such as a PSS, a SSS, and / or a tertiary synchronization signal (TSS) , as described herein with respect to FIGS. 7A-7C. In certain cases, certain synchronization signaling may be transmitted without a PBCH or certain system information (e.g., the MIB and / or SIB 1) .
[0107] A UE may use the PSS 608 and the SSS 610 for time and frequency synchronization for wireless communications with a network entity. As discussed herein, the PBCH 612 may carry certain system information (e.g., the MIB) that enables a UE to communicate with a network entity. Note that, in some cases, the term “SSB” may refer to a synchronization signal (SS) / physical broadcast channel (PBCH) block.
[0108] FIGS. 7A-7C illustrate example DRSs 700A-C in time-frequency domains. Referring to FIG. 7A, the DRS 700A includes a PSS 702 (e.g., the PSS 608) and an SSS 704 (e.g., the SSS 610) . As shown, the PSS 702 is arranged in a first symbol 706a, and the SSS 704 is arranged in a third symbol 706c. A second symbol 706b is arranged between the PSS 702 and the SSS 704. The first symbol 706a, second symbol 706b, and third symbol 706c may represent a sequence of consecutive symbols. In certain aspects, the PSS 702 and the SSS 704 may be arranged in the same symbol locations in the time domain as described herein with respect to an SSB in FIG. 6. The PSS 702 and SSS 704 may occupy a frequency bandwidth 708 in the frequency domain. For example, the PSS 702 and SSS 704 may occupy the same frequency bandwidth (e.g., 127 subcarriers) ora PSS and SSS in an SSB, respectively, as described herein with respect to FIG. 6.
[0109] As shown in FIG. 7B, the DRS 700B includes the PSS 702 and SSS 704 arranged in the first symbol 706a and second symbol 706b, respectively, and occupying the frequency bandwidth 708.
[0110] As depicted in FIG. 7C, the DRS 700C includes the PSS 702, the SSS 704, and one or more TSSs 710 (hereinafter “the TSS 710” ) . The PSS 702 and SSS 704 are arranged in the first symbol 706a and second symbol 706b, respectively. The TSS 710 may be arranged in the first symbol 706a and / or the second symbol 706b. In the frequency domain, the DRS 700C may have a frequency bandwidth 712, which may occupy the same frequency bandwidth as an SSB (e.g., 20 RBs) .
[0111] The DRS 700A-C may convey certain information, such as a physical cell identifier (PCI) associated with the cell in which the DRS is transmitted. The DRS 700A-C may convey certain time-frequency synchronization information, such as symbol timing and / or a GSCN corresponding to the DRS. In certain aspects, the DRS 700C may convey certain beamforming or spatial information, for example, via the TSS 710. Note that the DRS 700A-C may be transmitted without certain system information, such as the MIB and / or SIB1, which can be obtained via an on-demand SSB, for example, as described herein with respect to FIG. 5.
[0112] Aspects Related to Synchronization Signaling in Cell Discontinuous Communications
[0113] Aspects of the present disclosure provide certain schemes for communicating synchronization signals in cell DTX / DRX cycles, and more particularly, in the respective non-active time periods.
[0114] FIG. 8 illustrates an example of certain synchronization signaling 800 for a cell DTX cycle. In this example, a network entity (e.g., the BS 102 and / or any disaggregated entity thereof) may send synchronization signal (s) including a DRS 802 and / or an on-demand SSB 804 while a cell DTX cycle 810 is deactivated in a corresponding deactivated time period 806. At a specific occasion 808 (e.g., a particular symbol or slot) , a cell DTX cycle 810 may be activated. The network entity may configure one or more UEs with one or more parameters associated with the cell DTX cycle 810. The parameters may include, for example, a periodicity of the cell DTX cycle 810, a duration of a non-active time period 812, and / or a duration of an active time period 814. The network entity may send to the UE (s) an indication that the cell DTX cycle 810 is activated, for example, at the specific occasion 808. The network entity may inform the UE(s) that the cell DTX cycle 810 is activated and / or deactivated via control signaling, such as radio resource control (RRC) signaling, medium access control (MAC) signaling, downlink control information (DCI) (e.g., a group-common DCI) , etc.
[0115] The cell DTX cycle 810 may have a periodic sequence of time periods including a non-active time period 812 followed by an active time period 814. Note that cell DTX cycle 810 may have multiple non-active time periods and / or active time periods. In the non-active time period 812, the network entity may refrain from sending certain downlink traffic including, for example, semi-persistent scheduling (SPS) transmissions, downlink control information via a UE-specific search space set (USS) , periodic or semi-persistent reference signal (s) (e.g., CSI-RS) , certain DCI formats (e.g., PDCCH with DCI format 2_X, where X = 0, 1, . . ., 5) , etc. In the active time period 814, the network entity may send any traffic, and in particular, the traffic dropped in the non-active time period 812.
[0116] In certain aspects, the DRS 802 may not be dropped in the non-active time period 812 of the cell DTX cycle 810. For example, the network entity may send the DRS 802 in the non-active time period 812, and any UE (e.g., the UE 104) with the cell DTX cycle activated may monitor for the DRS 802 in the non-active time period 812. Transmission of the DRS 802 in the non-active time period may allow UEs to perform various wireless communications operations, such as time-frequency synchronization, path loss measurements, channel estimation, beam management (including beam refinement, beam failure detection, beam selection, etc. ) , etc. In some cases, the periodicity of the DRS 802 (e.g., the periodicity 504) may be increased in the non-active time period 812 compared to the active time period 814. The periodicity of the DRS 802 may have a first duration in the non-active time period 812 and a second duration in the active time period 814, where the first duration is longer than the second duration. For example, the periodicity of the DRS 802 may be 80 ms in the non-active time period 812 and 20 ms in the active time period 814. Such an increased periodicity in the non-active time period may enable power savings at the network entity and / or the UE.
[0117] In certain aspects, the DRS 802 may be dropped in the non-active time period 812. That is, the network entity may refrain from sending the DRS 802 in the non-active time period 812, and any UE with the cell DTX cycle 810 activated may refrain from monitoring for the DRS 802 in the non-active time period 812. Dropping the DRS 802 in the non-active time period 812 beneficially saves power at the network entity and / or the UE.
[0118] In certain aspects, an on-demand SSB 804 may not be dropped in the non-active time period of the cell DTX cycle 810. The network entity may send the on-demand SSB 804 in the non-active time period 812, and any UE with the cell DTX cycle 810 activated may monitor for the on-demand SSB 804 in the non-active time period 812. Transmission of the on-demand SSB in the non-active time period 812 enables a UE to perform cell acquisition with beneficially reduced latency.
[0119] In certain aspects, an on-demand SSB 804 may be dropped in the non-active time period of the cell DTX cycle 810. The network entity may refrain from sending the on-demand SSB 804 in the non-active time period 812, and any UE with the cell DTX cycle 810 activated may refrain from monitoring for the on-demand SSB 804 in the non-active time period 812. In some cases, the on-demand SSB 804 may be dropped in the non-active time period 812 ifthe on-demand SSB is non-cell-defining; otherwise, a cell-defining SSB may not be dropped in the non-active time period 812. A cell-defining SSB (CD-SSB) is an SSB that is associated with certain system information, for example, an RMSI. For example, the CD-SSB is transmitted with the RMSI. A non-cell-defining SSB (NCD-SSB) is an SSB that is not associated with an RMSI, and thus, the NCD-SSB may be transmitted without an RMSI. As an example, the network entity may refrain from sending the on-demand SSB 804 in the non-active time period 812 ifthe on-demand SSB 804 is a NCD-SSB, and any UE with the cell DTX cycle 810 activated may refrain from monitoring for a NCD-SSB in the non-active time period 812.
[0120] FIG. 9 illustrates an example of certain cell wake-up signaling 900 for a cell DRX cycle. In this example, a network entity (e.g., the BS 102 and / or any disaggregated entity thereof) may receive wake-up signal (s) including a C-WUS 902 while a cell DRX cycle 910 is deactivated in a corresponding deactivated time period 906. At a specific occasion 908 (e.g., a particular symbol or slot) , the cell DRX cycle 910 may be activated. As described herein with respect to the FIG. 8, the network entity may configure one or more UEs with one or more parameters associated with the cell DRX cycle 910. The parameters may include, for example, a periodicity of the cell DRX cycle 910, a duration of a non-active time period 912, and / or a duration of an active time period 914. The network entity may send, to the UE (s) , an indication that the cell DRX cycle 910 is activated, for example, at the specific occasion 908. The network entity may inform the UE (s) that the cell DRX cycle 910 is activated and / or deactivated via control signaling, such as RRC signaling, MAC signaling, DCI (e.g., a group-common DCI) , etc.
[0121] The cell DRX cycle 910 may have a periodic sequence of time periods including a non-active time period 912 followed by an active time period 914. Note that cell DRX cycle 910 may have multiple non-active time periods and / or active time periods. In the non-active time period 912, the network entity may refrain from receiving or monitoring for certain uplink traffic including, for example, configured grant (CG) transmission (s) , a scheduling request (SR) , periodic or semi-persistent sounding reference signal (s) , periodic or semi-persistent CSI report (s) , etc. In the active time period 914, the network entity may receive or monitor for any uplink traffic, and in particular, the traffic dropped in the non-active time period 912.
[0122] In certain aspects, the C-WUS 902 may not be dropped in the non-active time period 912 of the cell DRX cycle 910. For example, the network entity may monitor for or receive the C-WUS 902 in the non-active time period 912, and any UE (e.g., the UE 104) with the cell DRX cycle activated may send the C-WUS 902 in the non-active time period 912, for example, as described herein with respect to FIG. 5. Communication of the C-WUS 902 in the non-active time period 912 may allow a UE to receive an on-demand SSB (or SIB1) and perform cell acquisition, for example.
[0123] In certain aspects, the C-WUS 902 may be dropped in the non-active time period 912. The network entity may refrain from monitoring for or receiving the C-WUS 902 in the non-active time period 912, and any UE with the cell DRX cycle 910 activated may refrain from sending the C-WUS 902 in the non-active time period 912. Dropping the C-WUS 902 in the non-active time period 912 may enable power savings at the network entity and / or any UE with the cell DRX cycle 910 activated.
[0124] Example Operations of Synchronization Signaling in Cell Discontinuous Communications
[0125] FIG. 10 depicts a process flow 1000 for synchronization signaling in cell discontinuous communications in a system between a network entity 1002 and a user equipment (UE) 1004. In some aspects, the network entity 1002 may be an example of the BS 102 depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2. Similarly, the UE 1004 may be an example of UE 104 depicted and described with respect to FIG. 1 and 3. However, in other aspects, UE 1004 may be another type of wireless communications device and network entity 1002 may be another type of network entity or network node, such as those described herein. Note that any operations or signaling illustrated with dashed lines indicates that that operation or signaling may be optional or an alternative example. Note that the length of the example time periods and spacing between the operations or signaling are not indicative of exact timing in the process flow 1000.
[0126] At 1006, the UE 1004 obtains, from the network entity 1002, one or more configurations for a cell DTX cycle (e.g., the cell DTX cycle 810 of FIG. 8) and / or a cell DRX cycle (e.g., the cell DRX cycle 910 of FIG. 9) . The UE 1004 may receive a separate configuration for each of the cell DTX cycle and the cell DRX cycle. The configuration (s) may indicate a periodicity of the cell DTX / DRX cycle, a duration of a non-active time period (e.g., the non-active time period 812, 912 of FIGS. 8 and 9, respectively) , and / or a duration of an active time period (e.g., the active time period 814, 914 of FIGS. 8 and 9, respectively) . As an example, the cell DTX cycle may have an active time period 1018 followed by a non-active time period 1020, and the cell DRX cycle may have an active time period 1022 followed by a non-active time period 1024. In some cases, the configuration (s) may indicate that the cell DTX / DRX cycle is activated. The UE 1004 may receive the configuration via RRC signaling and / or system information.
[0127] At 1008, the UE 1004 obtains an indication that the cell DTX / DRX cycle (s) are activated. For example, the cell DTX / DRX cycle (s) may be activated via MAC signaling and / or DCI (e.g., a group-common DCI) .
[0128] At 1010, the UE 1004 obtains, from the network entity 1002, a DRS in the non-active time period 1020 of the cell DTX cycle. The DRS may carry a configuration for requesting an on-demand SSB or SIB1, as discussed above. Transmission of the DRS in the non-active time period 1020 of the cell DTX cycle may allow the UE 1004 to perform various operations, such as time-frequency synchronization, path loss measurements, channel estimation, beam management (including beam refinement, beam failure detection, beam selection, etc. ) , etc.
[0129] At 1012, the UE 1004 sends, to the network entity 1002, a C-WUS to request transmission of an on-demand SSB or SIB1. The UE 1004 sends the C-WUS in the non-active time period 1024 of the cell DRX cycle. Allowing the C-WUS in the non-active time period 1024 of the cell DRX cycle may enable the UE 1004 to perform cell acquisition.
[0130] At 1014, the UE 1004 obtains, from the network entity 1002, an on-demand SSB or SIB1 in the non-active time period 1020 of the cell DTX cycle. Transmission of the on-demand SSB or SIB1 in the non-active time period 1020 may enable the UE 1004 to perform cell acquisition, for example, using the system information carried in the on-demand SSB.
[0131] At 1016, the UE 1004 communicates with the network entity 1002 based at least in part on the synchronization signaling communicated at 1010, 1012, and 1014. For example, the UE 1004 may determine time and frequency pre-compensations based on measurements of the synchronization signals received in the DRS and / or on-demand SSB. The UE 1004 may use the DRS to identify the cell and perform time / frequency synchronization, for example, before the UE 1004 transmits the C-WUS. In certain aspects, the DRS may carry or indicate spatial beam information that can be used by the UE for configuring a spatial filter (e.g., beamforming) for the C-WUS transmission. In certain aspects, the on-demand SSB may provide certain system information (e.g., the RMSI and / or SIB1) that enables the UE 1004 to establish a communication link (e.g., an RRC connection) with the network entity 1002.
[0132] Example DRS Termination
[0133] In certain aspects, a network entity may refrain from sending a DRS in a time window (e.g., a time period) ifa corresponding on-demand SSB is transmitted in the time window, such as a synchronization signal burst (or SSB burst set) . A sequence of SSBs and / or DRSs arranged in a half frame may be referred to as a synchronization signal burst or SSB burst set. Such an operation of refraining from communicating the DRS may be referred to as DRS termination. The DRS termination enables efficient channel usage and reduced power consumption at a network entity and / or UE.
[0134] FIG. 11 depicts an example of DRS termination 1100. In this example, a DRS 1102a-d may have a periodic transmission occasion arranged in time windows 1104a-d, which may correspond to a synchronization signal burst. Note that one or more other DRSs may be arranged in the respective time windows 1104a-d. In the first time window 1104a, the first DRS 1102a is transmitted without an SSB.
[0135] In the time windows 1104b-d, an SSB 1106b-d (e.g., an on-demand SSB or SIB) associated with the DRS 1102b-d may be transmitted, and a network entity may refrain from transmitting or sending the DRS 1102b-d (e.g., a terminated DRS) in the respective time window 1104b-d. In certain aspects, a UE may refrain from monitoring for or obtaining the terminated DRS 1102b-d. The dashed lines shown for the DRSs 1102b-d indicate that that DRS is not communicated. An SSB may be associated with (or correspond to) a DRS when the SSB includes, indicates, or represents at least the same information as the DRS including, for example, the same cell identifier, time-frequency synchronization information, quasi-colocation information, spatial transmit-receive information, etc. In certain aspects, the SSB and corresponding DRS may be communicated via the same frequency resources. In the second time window 1104b, the transmission occasion of the SSB 1106b may be offset earlier in time from the transmission occasion of the DRS 1102b. In the third time window 1104c, the transmission occasion of the SSB 1106c may overlap in time with the transmission occasion of the DRS 1102c. In the fourth time window 1104d, the transmission occasion of the SSB 1104d may be offset later in time from the transmission occasion of the DRS 1102d. Accordingly, the terminated DRSs 1102b-d may enable reduced power consumption and / or efficient channel usage at the network entity and / or UE.
[0136] Example Operations of DRS Termination
[0137] FIG. 12 depicts a process flow 1200 for DRS termination in a system including a network entity 1202 and a UE 1204. In some aspects, the network entity 1202 may be an example of the BS 102 depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2. Similarly, the UE 1204 may be an example of UE 104 depicted and described with respect to FIG. 1 and 3. However, in other aspects, UE 1204 may be another type of wireless communications device and network entity 1202 may be another type of network entity or network node, such as those described herein. Note that any operations or signaling illustrated with dashed lines indicates that that operation or signaling may be optional or an alternative example.
[0138] At 1206, the UE 1204 obtains, from the network entity 1202, a DRS without a corresponding SSB, for example as depicted in the first time window 1104a in FIG. 11.
[0139] At 1208, the UE 1204 sends, to the network entity 1202, a C-WUS that requests transmission of an on-demand SSB or certain system information (e.g., SIB1) .
[0140] At 1210, the UE 1204 obtains, from the network entity 1202, an on-demand SSB without a corresponding DRS in a time window, for example, as depicted in FIG. 11.
[0141] At 1212, UE 1204 communicates with the network entity based at least in part on the DRS and / or the SSB, for example, as discussed above with respect to FIG. 10.
[0142] Example Operations
[0143] FIG. 13 shows a method 1300 for wireless communications by an apparatus, such as UE 104 of FIGS. 1 and 3.
[0144] Method 1300 begins at block 1305 with obtaining an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period (e.g., the active time period 814 of FIG. 8) during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period (e.g., the non-active time period 812 of FIG. 8) during which at least one downlink transmission via the cell is unavailable (e.g., denied, ignored, or disallowed) . In certain aspects, the cell corresponds to a carrier frequency and / or a wireless communications coverage area of a network entity (e.g., a transmission-reception point or radio unit) .
[0145] Method 1300 then proceeds to block 1310 with obtaining a first reference signal via the cell during the second time period. In certain aspects, the first reference signal comprises a DRS that indicates a configuration for requesting transmission of a second reference signal. In certain aspects, the DRS comprises one or more synchronization signals without a PBCH; and the second reference signal comprises a SSB. In certain aspects, the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity. For example, the first reference signal may be transmitted with the first periodicity during the first time period, and the first reference signal may be transmitted with the second periodicity during the second time period.
[0146] Method 1300 then proceeds to block 1315 with communicating with a network entity based at least in part on one or more measurements associated with the first reference signal. For example, the apparatus may determine time and / or frequency pre-compensations based on measurements of the first reference signal. In some cases, the apparatus may determine spatial filtering (e.g., beamforming) based on measurements of the first reference signal.
[0147] In certain aspects, method 1300 further includes obtaining the first reference signal via the cell during the first time period.
[0148] In certain aspects, method 1300 further includes obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period (e.g., the active time period 914 of FIG. 9) during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period (e.g., the non-active time period 912 of FIG. 9) during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1300 further includes sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0149] In certain aspects, method 1300 further includes obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1300 further includes refraining from sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal in response to the second configuration being activated. In certain aspects, the second reference signal comprises a SSB.
[0150] In certain aspects, method 1300 further includes obtaining the second reference signal via the cell during the second time period. In certain aspects, the second reference signal is a cell-defining SSB.
[0151] In certain aspects, method 1300 further includes refraining from monitoring for a second reference signal during the second time period in response to the first configuration for cell DTX being activated. In certain aspects, the second reference signal is a non-cell-defining SSB.
[0152] In certain aspects, the first reference signal comprises a SSB; and the method 1300 further comprises refraining from monitoring for a second reference signal in a time window in which the first reference signal is obtained. In certain aspects, method 1300 further includes sending, via the cell, a signal that requests transmission of the first reference signal, wherein the second reference signal comprises a DRS that indicates a configuration to request transmission of the first reference signal.
[0153] In certain aspects, method 1300, or any aspect related to it, may be performed by an apparatus, such as communications device 1900 of FIG. 19, which includes various components operable, configured, or adapted to perform the method 1300. Communications device 1900 is described below in further detail.
[0154] Note that FIG. 13 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0155] FIG. 14 shows a method 1400 for wireless communications by an apparatus, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0156] Method 1400 begins at block 1405 with sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable. In certain aspects, the cell corresponds to a carrier frequency and / or a wireless communications coverage area of a network entity (e.g., a transmission-reception point or radio unit) .
[0157] Method 1400 then proceeds to block 1410 with sending a first reference signal via the cell during the second time period. In certain aspects, the first reference signal comprises a DRS that indicates a configuration for requesting transmission of a second reference signal. In certain aspects, the DRS comprises one or more synchronization signals without a PBCH; and the second reference signal comprises a SSB.
[0158] Method 1400 then proceeds to block 1415 with communicating with a user equipment based at least in part on the first reference signal.
[0159] In certain aspects, method 1400 further includes sending the first reference signal via the cell during the first time period.
[0160] In certain aspects, the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity.
[0161] In certain aspects, method 1400 further includes sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1400 further includes obtaining, via the cell during the fourth time period, a signal that requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0162] In certain aspects, method 1400 further includes sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1400 further includes refraining from monitoring for a signal via the cell during the fourth time period in response to the second configuration being activated, wherein the signal requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0163] In certain aspects, method 1400 further includes sending the second reference signal via the cell during the second time period. In certain aspects, the second reference signal is a cell-defining SSB.
[0164] In certain aspects, method 1400 further includes refraining from sending a second reference signal during the second time period in response to the first configuration for cell DTX being activated. In certain aspects, the second reference signal is a non-cell-defining SSB.
[0165] In certain aspects, the first reference signal comprises a SSB; and the method 1400 further comprises refraining from sending a second reference signal in a time window in which the first reference signal is sent. In certain aspects, method 1400 further includes obtaining, via the cell, a signal that requests transmission of the first reference signal, wherein the second reference signal comprises a DRS that indicates a configuration to request transmission of the first reference signal.
[0166] In certain aspects, method 1400, or any aspect related to it, may be performed by an apparatus, such as communications device 2000 of FIG. 20, which includes various components operable, configured, or adapted to perform the method 1400. Communications device 2000 is described below in further detail.
[0167] Note that FIG. 14 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0168] FIG. 15 shows a method 1500 for wireless communications by an apparatus, such as UE 104 of FIGS. 1 and 3.
[0169] Method 1500 begins at block 1505 with obtaining an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable.
[0170] Method 1500 then proceeds to block 1510 with refraining from monitoring for a first reference signal via the cell during the second time period in response to the first configuration being activated. In certain aspects, the first reference signal comprises a DRS without a PBCH.
[0171] In certain aspects, method 1500 further includes obtaining the first reference signal via the cell during the first time period. In certain aspects, method 1500 further includes communicating with a network entity based at least in part on one or more measurements associated with the first reference signal.
[0172] In certain aspects, method 1500 further includes obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1500 further includes sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0173] In certain aspects, method 1500 further includes obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1500 further includes refraining from sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal in response to the second configuration being activated. In certain aspects, the second reference signal comprises a SSB.
[0174] In certain aspects, method 1500 further includes obtaining the second reference signal via the cell during the second time period. In certain aspects, the second reference signal is a cell-defining SSB.
[0175] In certain aspects, method 1500 further includes refraining from monitoring for a second reference signal during the second time period in response to the first configuration being activated. In certain aspects, the second reference signal is a non-cell-defining SSB.
[0176] In certain aspects, method 1500, or any aspect related to it, may be performed by an apparatus, such as communications device 1900 of FIG. 19, which includes various components operable, configured, or adapted to perform the method 1500. Communications device 1900 is described below in further detail.
[0177] Note that FIG. 15 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0178] FIG. 16 shows a method 1600 for wireless communications by an apparatus, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0179] Method 1600 begins at block 1605 with sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable.
[0180] Method 1600 then proceeds to block 1610 with refraining from sending a first reference signal via the cell during the second time period in response to the first configuration being activated. In certain aspects, the first reference signal comprises a DRS without a PBCH.
[0181] In certain aspects, method 1600 further includes sending the first reference signal via the cell during the first time period.
[0182] In certain aspects, method 1600 further includes sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1600 further includes obtaining, via the cell during the fourth time period, a signal that requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0183] In certain aspects, method 1600 further includes sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable. In certain aspects, method 1600 further includes refraining from monitoring for a signal via the cell during the fourth time period in response to the second configuration being activated, wherein the signal requests transmission of a second reference signal. In certain aspects, the second reference signal comprises a SSB.
[0184] In certain aspects, method 1600 further includes sending the second reference signal via the cell during the second time period. In certain aspects, the second reference signal is a cell-defining SSB.
[0185] In certain aspects, method 1600 further includes refraining from sending a second reference signal during the second time period in response to the first configuration being activated. In certain aspects, the second reference signal is a non-cell-defining SSB.
[0186] In certain aspects, method 1600, or any aspect related to it, may be performed by an apparatus, such as communications device 2000 of FIG. 20, which includes various components operable, configured, or adapted to perform the method 1600. Communications device 2000 is described below in further detail.
[0187] Note that FIG. 16 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0188] FIG. 17 shows a method 1700 for wireless communications by an apparatus, such as UE 104 of FIGS. 1 and 3.
[0189] Method 1700 begins at block 1705 with obtaining a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal. In certain aspects, a C-WUS configuration may be predefined or preconfigured, such that the reference signal may implicitly indicate the configuration, for example, via an indication of a physical cell identifier or any other suitable information conveyed in the reference signal. In certain aspects, the reference signal comprises a DRS comprising one or more synchronization signals without a PBCH or certain system information. In certain aspects, the one or more synchronization signals comprises a PSS and a SSS.
[0190] Method 1700 then proceeds to block 1710 with sending a request for the on-demand reference signal. In certain aspects, the request includes a C-WUS.
[0191] Method 1700 then proceeds to block 1715 with obtaining the on-demand reference signal in a time window. In certain aspects, the on-demand reference signal comprises a SSB. In certain aspects, the SSB comprises a PSS and a SSS.
[0192] Method 1700 then proceeds to block 1720 with refraining from monitoring for the reference signal in the time window in response to sending the request.
[0193] In certain aspects, a first transmission occasion for the reference signal in the time window overlaps with a second transmission occasion for the on-demand reference signal.
[0194] In certain aspects, a first transmission occasion for the reference signal in the time window is offset in time from a second transmission occasion for the on-demand reference signal.
[0195] In certain aspects, method 1700, or any aspect related to it, may be performed by an apparatus, such as communications device 1900 of FIG. 19, which includes various components operable, configured, or adapted to perform the method 1700. Communications device 1900 is described below in further detail.
[0196] Note that FIG. 17 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0197] FIG. 18 shows a method 1800 for wireless communications by an apparatus, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0198] Method 1800 begins at block 1805 with sending a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal. In certain aspects, the reference signal comprises a DRS comprising one or more synchronization signals without a PBCH. In certain aspects, the one or more synchronization signals comprises a PSS and a SSS.
[0199] Method 1800 then proceeds to block 1810 with obtaining a request for the on-demand reference signal. In certain aspects, the request includes a C-WUS.
[0200] Method 1800 then proceeds to block 1815 with sending the on-demand reference signal in a time window. In certain aspects, the on-demand reference signal comprises a SSB. In certain aspects, the SSB comprises a PSS and a SSS.
[0201] Method 1800 then proceeds to block 1820 with refraining from sending the reference signal in the time window in response to sending the on-demand reference signal.
[0202] In certain aspects, a first transmission occasion for the reference signal in the time window overlaps with a second transmission occasion for the on-demand reference signal.
[0203] In certain aspects, a first transmission occasion for the reference signal in the time window is offset in time from a second transmission occasion for the on-demand reference signal.
[0204] In certain aspects, method 1800, or any aspect related to it, may be performed by an apparatus, such as communications device 2000 of FIG. 20, which includes various components operable, configured, or adapted to perform the method 1800. Communications device 2000 is described below in further detail.
[0205] Note that FIG. 18 is just one example of a method, and other methods including fewer, additional, or alternative operations are possible consistent with this disclosure.
[0206] Example Communications Devices
[0207] FIG. 19 depicts aspects of an example communications device 1900. In some aspects, communications device 1900 is a user equipment, such as UE 104 described above with respect to FIGS. 1 and 3.
[0208] The communications device 1900 includes a processing system 1905 coupled to a transceiver 1965 (e.g., a transmitter and / or a receiver) . The transceiver 1965 is configured to transmit and receive signals for the communications device 1900 via an antenna 1970, such as the various signals as described herein. The processing system 1905 may be configured to perform processing functions for the communications device 1900, including processing signals received and / or to be transmitted by the communications device 1900.
[0209] The processing system 1905 includes one or more processors 1910. In various aspects, the one or more processors 1910 may be representative of one or more of receive processor 358, transmit processor 364, TX MIMO processor 366, and / or controller / processor 380, as described with respect to FIG. 3. The one or more processors 1910 are coupled to a computer-readable medium / memory 1935 via a bus 1960. In certain aspects, the computer-readable medium / memory 1935 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1910, enable and cause the one or more processors 1910 to perform the method 1300 described with respect to FIG. 13, or any aspect related to it, including any operations described in relation to FIG. 13; the method 1500 described with respect to FIG. 15, or any aspect related to it, including any operations described in relation to FIG. 15; and the method 1700 described with respect to FIG. 17, or any aspect related to it, including any operations described in relation to FIG. 17. Note that reference to a processor performing a function of communications device 1900 may include one or more processors performing that function of communications device 1900, such as in a distributed fashion.
[0210] In the depicted example, computer-readable medium / memory 1935 stores code for obtaining 1940, code for communicating 1945, code for sending 1950, and code for refraining 1955. Processing of the code 1940-1955 may enable and cause the communications device 1900 to perform the method 1300 described with respect to FIG. 13, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it.
[0211] The one or more processors 1910 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1935, including circuitry for obtaining 1915, circuitry for communicating 1920, circuitry for sending 1925, and circuitry for refraining 1930. Processing with circuitry 1915-1930 may enable and cause the communications device 1900 to perform the method 1300 described with respect to FIG. 13, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it.
[0212] More generally, means for communicating, transmitting, sending or outputting for transmission may include the transceivers 354, antenna (s) 352, transmit processor 364, TX MIMO processor 366, AI processor 370, and / or controller / processor 380 of the UE 104 illustrated in FIG. 3, transceiver 1965 and / or antenna 1970 of the communications device 1900 in FIG. 19, and / or one or more processors 1910 of the communications device 1900 in FIG. 19. Means for communicating, receiving or obtaining may include the transceivers 354, antenna (s) 352, receive processor 358, AI processor 370, and / or controller / processor 380 of the UE 104 illustrated in FIG. 3, transceiver 1965 and / or antenna 1970 of the communications device 1900 in FIG. 19, and / or one or more processors 1910 of the communications device 1900 in FIG. 19. Means for refraining may include the controller / processor 380 of the UE 104 illustrated in FIG. 3, and / or one or more processors 1910 of the communications device 1900 in FIG. 19.
[0213] FIG. 20 depicts aspects of an example communications device 2000. In some aspects, communications device 2000 is a network entity, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0214] The communications device 2000 includes a processing system 2005 coupled to a transceiver 2065 (e.g., a transmitter and / or a receiver) and / or a network interface 2075. The transceiver 2065 is configured to transmit and receive signals for the communications device 2000 via an antenna 2070, such as the various signals as described herein. The network interface 2075 is configured to obtain and send signals for the communications device 2000 via communications link (s) , such as a backhaul link, midhaul link, and / or fronthaul link as described herein, such as with respect to FIG. 2. The processing system 2005 may be configured to perform processing functions for the communications device 2000, including processing signals received and / or to be transmitted by the communications device 2000.
[0215] The processing system 2005 includes one or more processors 2010. In various aspects, one or more processors 2010 may be representative of one or more of receive processor 338, transmit processor 320, TX MIMO processor 330, and / or controller / processor 340, as described with respect to FIG. 3. The one or more processors 2010 are coupled to a computer-readable medium / memory 2035 via a bus 2060. In certain aspects, the computer-readable medium / memory 2035 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 2010, enable and cause the one or more processors 2010 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it, including any operations described in relation to FIG. 14; the method 1600 described with respect to FIG. 16, or any aspect related to it, including any operations described in relation to FIG. 16; and the method 1800 described with respect to FIG. 18, or any aspect related to it, including any operations described in relation to FIG. 18. Note that reference to a processor of communications device 2000 performing a function may include one or more processors of communications device 2000 performing that function, such as in a distributed fashion.
[0216] In the depicted example, the computer-readable medium / memory 2035 stores code for sending 2040, code for communicating 2045, code for obtaining 2050, and code for refraining 2055. Processing of the code 2040-2055 may enable and cause the communications device 2000 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1800 described with respect to FIG. 18, or any aspect related to it.
[0217] The one or more processors 2010 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 2035, including circuitry for sending 2015, circuitry for communicating 2020, circuitry for obtaining 2025, and circuitry for refraining 2030. Processing with circuitry 2015-2030 may enable and cause the communications device 2000 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1800 described with respect to FIG. 18, or any aspect related to it.
[0218] More generally, means for communicating, transmitting, sending or outputting for transmission may include the transceivers 332, antenna (s) 334, transmit processor 320, TX MIMO processor 330, AI processor 318, and / or controller / processor 340 of the BS 102 illustrated in FIG. 3, transceiver 2065, antenna 2070, and / or network interface 2075 of the communications device 2000 in FIG. 20, and / or one or more processors 2010 of the communications device 2000 in FIG. 20. Means for communicating, receiving or obtaining may include the transceivers 332, antenna (s) 334, receive processor 338, AI processor 318, and / or controller / processor 340 of the BS 102 illustrated in FIG. 3, transceiver 2065, antenna 2070, and / or network interface 2075 of the communications device 2000 in FIG. 20, and / or one or more processors 2010 of the communications device 2000 in FIG. 20. Means for refraining may include the controller / processor 340 of the BS 102 illustrated in FIG. 3, and / or one or more processors 2010 of the communications device 2000 in FIG. 20.
[0219] Example Clauses
[0220] Implementation examples are described in the following numbered clauses:
[0221] Clause 1: A method for wireless communications by an apparatus comprising: obtaining an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; obtaining a first reference signal via the cell during the second time period; and communicating with a network entity based at least in part on one or more measurements associated with the first reference signal.
[0222] Clause 2: The method of Clause 1, wherein the first reference signal comprises a DRS that indicates a configuration for requesting transmission of a second reference signal.
[0223] Clause 3: The method of Clause 2, wherein: the DRS comprises one or more synchronization signals without a PBCH; and the second reference signal comprises a SSB.
[0224] Clause 4: The method of any one of Clauses 1-3, wherein the cell corresponds to a carrier frequency.
[0225] Clause 5: The method of any one of Clauses 1-4, further comprising obtaining the first reference signal via the cell during the first time period.
[0226] Clause 6: The method of any one of Clauses 1-5, wherein the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity.
[0227] Clause 7: The method of any one of Clauses 1-6, further comprising: obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.
[0228] Clause 8: The method of any one of Clauses 1-7, further comprising: obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and refraining from sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal in response to the second configuration being activated.
[0229] Clause 9: The method of Clause 7 or 8, wherein the second reference signal comprises a SSB.
[0230] Clause 10: The method of Clause 7, further comprising obtaining the second reference signal via the cell during the second time period.
[0231] Clause 11: The method of Clause 10, wherein the second reference signal is a cell-defining SSB.
[0232] Clause 12: The method of any one of Clauses 1-11, further comprising refraining from monitoring for a second reference signal during the second time period in response to the first configuration for cell DTX being activated.
[0233] Clause 13: The method of Clause 12, wherein the second reference signal is a non-cell-defining SSB.
[0234] Clause 14: The method of any one of Clauses 1-13, wherein: the first reference signal comprises a SSB; and the method further comprises refraining from monitoring for a second reference signal in a time window in which the first reference signal is obtained.
[0235] Clause 15: The apparatus of Clause 14, further comprising: sending, via the cell, a signal that requests transmission of the first reference signal, wherein the second reference signal comprises a DRS that indicates a configuration to request transmission of the first reference signal.
[0236] Clause 16: A method for wireless communications by an apparatus comprising: sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; sending a first reference signal via the cell during the second time period; and communicating with a user equipment based at least in part the first reference signal.
[0237] Clause 17: The method of Clause 16, wherein the first reference signal comprises a DRS that indicates a configuration for requesting transmission of a second reference signal.
[0238] Clause 18: The method of Clause 17, wherein: the DRS comprises one or more synchronization signals without a PBCH; and the second reference signal comprises a SSB.
[0239] Clause 19: The method of any one of Clauses 16-18, wherein the cell corresponds to a carrier frequency.
[0240] Clause 20: The method of any one of Clauses 16-19, further comprising sending the first reference signal via the cell during the first time period.
[0241] Clause 21: The method of any one of Clauses 16-20, wherein the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity.
[0242] Clause 22: The method of any one of Clauses 16-21, further comprising: sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and obtaining, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.
[0243] Clause 23: The method of any one of Clauses 16-22, further comprising: sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and refraining from monitoring for a signal via the cell during the fourth time period in response to the second configuration being activated, wherein the signal requests transmission of a second reference signal.
[0244] Clause 24: The method of Clause 22 or 23, wherein the second reference signal comprises a SSB.
[0245] Clause 25: The method of Clause 22, further comprising sending the second reference signal via the cell during the second time period.
[0246] Clause 26: The method of Clause 25, wherein the second reference signal is a cell-defining SSB.
[0247] Clause 27: The method of any one of Clauses 16-26, further comprising refraining from sending a second reference signal during the second time period in response to the first configuration for cell DTX being activated.
[0248] Clause 28: The method of Clause 27, wherein the second reference signal is a non-cell-defining SSB.
[0249] Clause 29: The method of any one of Clauses 16-28, wherein: the first reference signal comprises a SSB; and the method further comprises refraining from sending a second reference signal in a time window in which the first reference signal is sent.
[0250] Clause 30: The apparatus of Clause 29, further comprising: obtaining, via the cell, a signal that requests transmission of the first reference signal, wherein the second reference signal comprises a DRS that indicates a configuration to request transmission of the first reference signal.
[0251] Clause 31: A method for wireless communications by an apparatus comprising: obtaining an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; and refraining from monitoring for a first reference signal via the cell during the second time period in response to the first configuration being activated.
[0252] Clause 32: The method of Clause 31, wherein the first reference signal comprises a DRS without a PBCH.
[0253] Clause 33: The method of any one of Clauses 31-32, further comprising: obtaining the first reference signal via the cell during the first time period; and communicating with a network entity based at least in part on one or more measurements associated with the first reference signal.
[0254] Clause 34: The method of any one of Clauses 31-33, further comprising: obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.
[0255] Clause 35: The method of any one of Clauses 31-34, further comprising: obtaining an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and refraining from sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal in response to the second configuration being activated.
[0256] Clause 36: The method of Clause 34 or 25, wherein the second reference signal comprises a SSB.
[0257] Clause 37: The method of Clause 34, further comprising obtaining the second reference signal via the cell during the second time period.
[0258] Clause 38: The method of Clause 37, wherein the second reference signal is a cell-defining SSB.
[0259] Clause 39: The method of any one of Clauses 31-38, further comprising refraining from monitoring for a second reference signal during the second time period in response to the first configuration being activated.
[0260] Clause 40: The method of Clause 39, wherein the second reference signal is a non-cell-defining SSB.
[0261] Clause 41: A method for wireless communications by an apparatus comprising: sending an indication to activate a first configuration for cell DTX, wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable; and refraining from sending a first reference signal via the cell during the second time period in response to the first configuration being activated.
[0262] Clause 42: The method of Clause 41, wherein the first reference signal comprises a DRS without a PBCH.
[0263] Clause 43: The method of any one of Clauses 41-42, further comprising sending the first reference signal via the cell during the first time period.
[0264] Clause 44: The method of any one of Clauses 41-43, further comprising: sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and obtaining, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.
[0265] Clause 45: The method of any one of Clauses 41-44, further comprising: sending an indication to activate a second configuration for cell DRX, wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; and refraining from monitoring for a signal via the cell during the fourth time period in response to the second configuration being activated, wherein the signal requests transmission of a second reference signal.
[0266] Clause 46: The method of Clause 44 or 45, wherein the second reference signal comprises a SSB.
[0267] Clause 47: The method of Clause 44, further comprising sending the second reference signal via the cell during the second time period.
[0268] Clause 48: The method of Clause 47, wherein the second reference signal is a cell-defining SSB.
[0269] Clause 49: The method of any one of Clauses 41-48, further comprising refraining from sending a second reference signal during the second time period in response to the first configuration being activated.
[0270] Clause 50: The method of Clause 49, wherein the second reference signal is a non-cell-defining SSB.
[0271] Clause 51: A method for wireless communications by an apparatus comprising: obtaining a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal; sending a request for the on-demand reference signal; obtaining the on-demand reference signal in a time window; and refraining from monitoring for the reference signal in the time window in response to sending the request.
[0272] Clause 52: The method of Clause 51, wherein the reference signal comprises a DRS comprising one or more synchronization signals without a PBCH.
[0273] Clause 53: The method of Clause 52, wherein the one or more synchronization signals comprises a PSS and a SSS.
[0274] Clause 54: The method of any one of Clauses 51-53, wherein the request includes a C-WUS.
[0275] Clause 55: The method of any one of Clauses 51-54, wherein the on-demand reference signal comprises a SSB.
[0276] Clause 56: The method of Clause 55, wherein the SSB comprises a PSS and a SSS.
[0277] Clause 57: The method of any one of Clauses 51-56, wherein a first transmission occasion for the reference signal in the time window overlaps with a second transmission occasion for the on-demand reference signal.
[0278] Clause 58: The method of any one of Clauses 51-57, wherein a first transmission occasion for the reference signal in the time window is offset in time from a second transmission occasion for the on-demand reference signal.
[0279] Clause 59: A method for wireless communications by an apparatus comprising: sending a reference signal that indicates a configuration for requesting transmission of an on-demand reference signal; obtaining a request for the on-demand reference signal; sending the on-demand reference signal in a time window; and refraining from sending the reference signal in the time window in response to sending the on-demand reference signal.
[0280] Clause 60: The method of Clause 59, wherein the reference signal comprises a DRS comprising one or more synchronization signals without a PBCH.
[0281] Clause 61: The method of Clause 60, wherein the one or more synchronization signals comprises a PSS and a SSS.
[0282] Clause 62: The method of any one of Clauses 59-61, wherein the request includes a C-WUS.
[0283] Clause 63: The method of any one of Clauses 59-62, wherein the on-demand reference signal comprises a SSB.
[0284] Clause 64: The method of Clause 63, wherein the SSB comprises a PSS and a SSS.
[0285] Clause 65: The method of any one of Clauses 59-64, wherein a first transmission occasion for the reference signal in the time window overlaps with a second transmission occasion for the on-demand reference signal.
[0286] Clause 66: The method of any one of Clauses 59-65, wherein a first transmission occasion for the reference signal in the time window is offset in time from a second transmission occasion for the on-demand reference signal.
[0287] Clause 67: One or more apparatuses, comprising: one or more memories comprising executable instructions; and one or more processors configured to execute the executable instructions and cause the one or more apparatuses to perform a method in accordance with any one of Clauses 1-66.
[0288] Clause 68: One or more apparatuses, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the one or more apparatuses to perform a method in accordance with any one of Clauses 1-66.
[0289] Clause 69: One or more apparatuses, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to perform a method in accordance with any one of Clauses 1-66.
[0290] Clause 70: One or more apparatuses, comprising means for performing a method in accordance with any one of Clauses 1-66.
[0291] Clause 71: One or more non-transitory computer-readable media comprising executable instructions that, when executed by one or more processors of one or more apparatuses, cause the one or more apparatuses to perform a method in accordance with any one of Clauses 1-66.
[0292] Clause 72: One or more computer program products embodied on one or more computer-readable storage media comprising code for performing a method in accordance with any one of Clauses 1-66.
[0293] Clause 73: A user equipment (UE) , comprising: a processing system that includes processor circuitry and memory circuitry that stores code and is coupled with the processor circuitry, the processing system configured to cause the UE to perform a method in accordance with any one of Clauses 1-66.
[0294] Clause 74: A network entity, comprising: a processing system that includes processor circuitry and memory circuitry that stores code and is coupled with the processor circuitry, the processing system configured to cause the network entity to perform a method in accordance with any one of Clauses 1-66.
[0295] Additional Considerations
[0296] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting of the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various actions may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0297] The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, an AI processor, a digital signal processor (DSP) , an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD) , discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination ofa DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC) , or any other such configuration.
[0298] As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
[0299] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
[0300] As used herein, “coupled to” and “coupled with” generally encompass direct coupling and indirect coupling (e.g., including intermediary coupled aspects) unless stated otherwise. For example, stating that a processor is coupled to a memory allows for a direct coupling or a coupling via an intermediary aspect, such as a bus.
[0301] The methods disclosed herein comprise one or more actions for achieving the methods. The method actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. Further, the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component (s) and / or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
[0302] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Reference to an element in the singular is not intended to mean only one unless specifically so stated, but rather “one or more. ” The subsequent use of a definite article (e.g., “the” or “said” ) with an element (e.g., “the processor” ) is not intended to invoke a singular meaning (e.g., “only one” ) on the element unless otherwise specifically stated. For example, reference to an element (e.g., “a processor, ” “a controller, ” “a memory, ” “a transceiver, ” “an antenna, ” “the processor, ” “the controller, ” “the memory, ” “the transceiver, ” “the antenna, ” etc. ) , unless otherwise specifically stated, should be understood to refer to one or more elements (e.g., “one or more processors, ” “one or more controllers, ” “one or more memories, ” “one more transceivers, ” etc. ) . The terms “set” and “group” are intended to include one or more elements, and may be used interchangeably with “one or more. ” Where reference is made to one or more elements performing functions (e.g., steps of a method) , one element may perform all functions, or more than one element may collectively perform the functions. When more than one element collectively performs the functions, each function need not be performed by each of those elements (e.g., different functions may be performed by different elements) and / or each function need not be performed in whole by only one element (e.g., different elements may perform different sub-functions of a function) . Similarly, where reference is made to one or more elements configured to cause another element (e.g., an apparatus) to perform functions, one element may be configured to cause the other element to perform all functions, or more than one element may collectively be configured to cause the other element to perform the functions. Unless specifically stated otherwise, the term “some” refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are intended to be encompassed by the claims. 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.An apparatus configured for wireless communications, comprising:one or more memories; andone or more processors coupled to the one or more memories, the one or more processors being configured to cause the apparatus to:obtain an indication to activate a first configuration for cell discontinuous transmission (DTX) , wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable;obtain a first reference signal via the cell during the second time period; andcommunicate with a network entity based at least in part on one or more measurements associated with the first reference signal.2.The apparatus of claim 1, wherein the first reference signal comprises a discovery reference signal (DRS) that indicates a configuration for requesting transmission of a second reference signal.3.The apparatus of claim 2, wherein:the DRS comprises one or more synchronization signals without a physical broadcast channel (PBCH) ; andthe second reference signal comprises a synchronization signal block (SSB) .4.The apparatus of claim 1, wherein the one or more processors are configured to cause the apparatus to obtain the first reference signal via the cell during the first time period.5.The apparatus of claim 1, wherein the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity.6.The apparatus of claim 1, wherein the one or more processors are configured to cause the apparatus to:obtain an indication to activate a second configuration for cell discontinuous reception (DRX) , wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; andsend, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.7.The apparatus of claim 1, wherein the one or more processors are configured to cause the apparatus to:obtain an indication to activate a second configuration for cell discontinuous reception (DRX) , wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; andrefrain from sending, via the cell during the fourth time period, a signal that requests transmission of a second reference signal in response to the second configuration being activated.8.The apparatus of claim 6, wherein the one or more processors are configured to cause the apparatus to obtain the second reference signal via the cell during the second time period.9.The apparatus of claim 8, wherein the second reference signal is a cell-defining synchronization signal block (SSB) .10.The apparatus of claim 1, wherein the one or more processors are configured to cause the apparatus to refrain from monitoring for a second reference signal during the second time period in response to the first configuration for cell DTX being activated, wherein the second reference signal is a non-cell-defining synchronization signal block (SSB) .11.An apparatus configured for wireless communications, comprising:one or more memories; andone or more processors coupled to the one or more memories, the one or more processors being configured to cause the apparatus to:send an indication to activate a first configuration for cell discontinuous transmission (DTX) , wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable;send a first reference signal via the cell during the second time period; andcommunicate with a user equipment based at least in part the first reference signal.12.The apparatus of claim 11, wherein the first reference signal comprises a discovery reference signal (DRS) that indicates a configuration for requesting transmission of a second reference signal.13.The apparatus of claim 12, wherein:the DRS comprises one or more synchronization signals without a physical broadcast channel (PBCH) ; andthe second reference signal comprises a synchronization signal block (SSB) .14.The apparatus of claim 11, wherein the one or more processors are configured to cause the apparatus to send the first reference signal via the cell during the first time period.15.The apparatus of claim 11, wherein the first reference signal has a first periodicity associated with the first time period, and a second periodicity associated with the second time period, the second periodicity being longer in duration than the first periodicity.16.The apparatus of claim 11, wherein the one or more processors are configured to cause the apparatus to:send an indication to activate a second configuration for cell discontinuous reception (DRX) , wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; andobtain, via the cell during the fourth time period, a signal that requests transmission of a second reference signal.17.The apparatus of claim 11, wherein the one or more processors are configured to cause the apparatus to:send an indication to activate a second configuration for cell discontinuous reception (DRX) , wherein the second configuration indicates (i) a third time period during which one or more uplink receptions via the cell are allowed, and (ii) a fourth time period during which at least one uplink reception via the cell is unavailable; andrefrain from monitoring for a signal via the cell during the fourth time period in response to the second configuration being activated, wherein the signal requests transmission of a second reference signal.18.The apparatus of claim 16, wherein the one or more processors are configured to cause the apparatus to send the second reference signal via the cell during the second time period.19.The apparatus of claim 11, wherein the one or more processors are configured to cause the apparatus to refrain from sending a second reference signal during the second time period in response to the first configuration for cell DTX being activated, wherein the second reference signal is a non-cell-defining synchronization signal block (SSB) .20.A method for wireless communications by an apparatus comprising:obtaining an indication to activate a first configuration for cell discontinuous transmission (DTX) , wherein the first configuration indicates (i) a first time period during which one or more downlink transmissions via a cell are allowed, and (ii) a second time period during which at least one downlink transmission via the cell is unavailable;obtaining a first reference signal via the cell during the second time period; andcommunicating with a network entity based at least in part on one or more measurements associated with the first reference signal.
Citation Information
Patent Citations
Communication method and device
CN116367191A
Information transmission method and device, terminal equipment and network equipment
CN117014905A
Device in wireless communication system and method
US20170202052A1