Dynamic signaling of configured cell group for mobility inter layer 1 and layer 2

Abstract

Certain aspects of the present disclosure provide a method of wireless communication at a user equipment (UE), the method generally including receiving, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured for serving the UE and supporting mobility signaling; receiving signaling indicating that a cell group for the UE is removed from the set of cells; and releasing the indicated group from the cell set.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Patent Application No. 18 / 456,000, filed on August 25, 2023, which claims the benefit of and priority to U.S. Provisional Patent Application No. 63 / 409,074, filed on September 22, 2022, both of which are assigned to the assignee of this application and are incorporated herein by reference in their entirety as if fully set forth below and for all applicable purposes. Technical Field

[0003] Aspects of the present disclosure relate to wireless communications, and more particularly to techniques for dynamically signaling a user equipment (UE) to release a configured cell group for a cell, the techniques supporting cell changes via dynamic signaling.

[0004] Related technical description

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts or other similar types of services. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available wireless communication system resources with those users.

[0006] Although wireless communication systems have made tremendous technical progress over the years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Therefore, there is a continuous desire to improve the technical performance of wireless communication systems, including, for example: improving the speed and data carrying capacity of communications, improving the efficiency of using shared communication media, reducing the power used by transmitters and receivers when performing communications, improving the reliability of wireless communications, avoiding redundant transmission and / or reception and related processing, improving the coverage area of ​​wireless communications, increasing the number and types of devices that can access wireless communication systems, increasing the ability of different types of devices to communicate with each other, increasing the number and types of wireless communication media available for use, etc. Therefore, there is a need to further improve wireless communication systems to overcome the aforementioned technical challenges and other challenges. Summary of the invention

[0007] One aspect provides a method for wireless communication at a user equipment (UE). The method includes: receiving a configuration indicating a set of cells configured to serve the UE and support mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; receiving signaling indicating that a cell group for the UE is removed from the cell group; and releasing the indicated group from the cell group.

[0008] In another aspect, a method for wireless communication at a network entity is provided. The method includes: sending a configuration indicating a set of cells configured to serve a user equipment (UE) and support mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; sending a first signaling indicating that a cell group for the UE is removed from the cell set; and removing the indicated group from the cell set.

[0009] Other aspects provide: an apparatus operable to, configured to, or otherwise adapted to perform any one or more of the foregoing methods and / or those described elsewhere herein; a non-transitory computer-readable medium comprising instructions that, when executed by a processor of the apparatus, cause the apparatus to perform the foregoing methods and those described elsewhere herein; a computer program product embodied on a computer-readable storage medium, the computer-readable storage medium comprising code for performing the foregoing methods and those described elsewhere herein; and / or an apparatus comprising components for performing the foregoing methods and those described elsewhere herein. By way of example, an apparatus may include a processing system, a device having a processing system, or a processing system cooperating through one or more networks.

[0010] For purposes of illustration, the following description and drawings set forth certain features. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings depict certain features of the various aspects described herein and should not be considered to limit the scope of the disclosure.

[0012] Figure 1 An example wireless communication network is depicted.

[0013] Figure 2 An example disaggregated base station architecture is depicted.

[0014] Figure 3 Aspects of an example base station and example user equipment are depicted.

[0015] Figure 4A , Figure 4B , Figure 4C and Figure 4D Various example aspects of data structures for a wireless communication network are described.

[0016] Figure 5

[0013] Examples of UE mobility in accordance with some aspects of the present disclosure are depicted.

[0017] Figure 6 Depicted are examples of carrier aggregation (CA) configurations in accordance with some aspects of the present disclosure.

[0018] Figure 7Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0019] Figure 8 Depicted are fields of an exemplary Medium Access Control (MAC) Control Element (MAC-CE) in accordance with aspects of the present disclosure.

[0020] Fig. 9 A method for wireless communication is described.

[0021] Fig.10 A method for wireless communication is described.

[0022] Fig.11 Aspects of an exemplary communications device are depicted.

[0023] Fig.12 Aspects of an exemplary communications device are depicted. DETAILED DESCRIPTION

[0024] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for dynamically signaling a user equipment (UE) to release a configured cell group for a cell, which support cell changes via dynamic signaling.

[0025] In advanced wireless systems, when user equipment (UE) moves between coverage areas of different cells, mobility management procedures appropriately help maintain the network connection of the user equipment. Mobility procedures generally refer to mechanisms that allow UEs to transition from being served by a source cell to being served by a target cell. Dynamic signaling-based mobility is referred to herein as L1 / L2-based inter-cell mobility because it is typically based on layer 1 (L1) communications (i.e., physical (PHY) layer signaling, such as downlink control information (DCI)) or layer 2 (L2) communications (i.e., medium access control (MAC) layer signaling, such as MAC control elements (MAC-CE)) to guide the UE to transition from being served by a source cell to being served by a target cell.

[0026] When the UE moves, some cells may no longer be suitable for L1 / L2 mobility. For example, when the UE moves too far from some cells, those cells are no longer suitable for L1 / L2 mobility because the UE will not be able to activate those cells without being close to those cells. Although unused cells may be stored in a deactivated cell set in the configured L1 / L2 mobility cell set, the UE may be configured to perform measurements on the deactivated cell set, resulting in power consumption.

[0027] In this case, it may be preferable to remove those cells from the UE's L1 / L2 mobility cell set, thereby freeing up UE resources (e.g., memory).Even if the UE is configured not to perform measurements on deactivated cells, the UE may have a capability limitation on the maximum number of cells supported in the configured L1 / L2 mobility cell set.

[0028] Various aspects of the present disclosure provide techniques for using DCI or MAC-CE signaling to indicate to a UE to release one or more cells or cell groups from a L1 / L2 mobility configuration. When a UE moves between cells, the mechanisms proposed herein can help reduce latency, achieve efficient use of signaling resources, and reduce power consumption caused by the UE.

[0029] Introduction to wireless communication networks

[0030] The techniques and methods described herein can be used in various wireless communication networks. Although various aspects may be described herein using terms commonly associated with 3G, 4G and / or 5G wireless technologies, various aspects of the present disclosure may also be applicable to other communication systems and standards not explicitly mentioned herein.

[0031] Figure 1 An example of a wireless communication network 100 is depicted in which various aspects described herein may be implemented.

[0032] In general, the wireless communication network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is typically a communication device and / or a communication function performed by a communication device (e.g., user equipment (UE), base station (BS), component of a BS, server, etc.). For example, various functions of a network and various devices associated with and interacting with the network may be considered network entities. In addition, the wireless communication network 100 includes ground aspects, such as ground-based network entities (e.g., BS 102), and non-ground aspects, such as satellites 140 and aircraft 145, which may include airborne network entities (e.g., one or more BSs) capable of communicating with other network elements (e.g., ground BSs) and user equipment.

[0033] In the depicted example, the wireless communication network 100 includes a BS 102, a UE 104, and one or more core networks (such as an evolved packet core (EPC) 160 and a 5G core (5GC) network 190) that interoperate to provide communication services over various communication links (including wired links and wireless links).

[0034] Figure 1Various example UEs 104 are depicted, which may more generally include: a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player, a camera, a game console, a tablet computer, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, an Internet of Things (IoT) device, an Always-On (AON) device, an edge processing device, or other similar devices. UE 104 may also be more generally referred to as a mobile device, a wireless device, a wireless communication 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 other user equipment.

[0035] BS 102 wirelessly communicates with (e.g., transmits signals to or receives signals from) UE 104 via communication link 120. Communication link 120 between BS 102 and UE 104 may include uplink (UL) (also referred to as a reverse link) transmissions from UE 104 to BS 102 and / or downlink (DL) (also referred to as a forward link) transmissions from BS 102 to UE 104. In various aspects, communication link 120 may employ multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity.

[0036] BS 102 may generally include: a Node B, an enhanced Node B (eNB), a next generation enhanced Node B (ng-eNB), a next generation Node B (gNB or gNodeB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a transmit / receive point, and / or other base stations. Each of BSs 102 may provide communication coverage for a corresponding geographic coverage area 110, which may sometimes be referred to as a cell, and may overlap in some cases (e.g., a small cell 102' may have a coverage area 110' that overlaps with a coverage area 110 of a macro cell). For example, a BS may provide communication coverage for a macro cell (covering a relatively large geographic area), a pico cell (covering a relatively small geographic area, such as a stadium), a femto cell (a relatively small geographic area (e.g., a home)), and / or other types of cells.

[0037] Although BS102 is depicted as a single communication device in various aspects, BS102 can be implemented in various configurations. For example, one or more components of the base station may be decomposed, including a central unit (CU), one or more distributed units (DU), one or more radio units (RU), 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 the base station may be virtualized. More generally, a base station (e.g., BS102) may include components located at a single physical location or components located at various physical locations. In an example in which the base station includes components located at various physical locations, the various components may each perform a function so that the various components together implement functionality similar to that of a base station located at a single physical location. In some aspects, a base station including components located at various physical locations may be referred to as a decomposed radio access network architecture (such as an open RAN (O-RAN) or virtualized RAN (VRAN) architecture). Figure 2 An example decomposed base station architecture is depicted and described.

[0038] Different BSs 102 within the wireless communication network 100 may also be configured to support different radio access technologies (such as 3G, 4G, and / or 5G). For example, a BS 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 via a first backhaul link 132 (e.g., an S1 interface). A BS 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a second backhaul link 184. The BSs 102 may communicate with each other directly or indirectly (e.g., via the EPC 160 or the 5GC 190) over a third backhaul link 134 (e.g., an X2 interface), which may be wired or wireless.

[0039] The wireless communication network 100 may subdivide the electromagnetic spectrum into various categories, frequency bands, channels, or other characteristics. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, subcarrier, channel, tone, or subband. For example, 3GPP currently defines frequency range 1 (FR1) as including 410 MHz to 7125 MHz, which is often (interchangeably) referred to as "below 6 GHz". Similarly, 3GPP currently defines frequency range 2 (FR2) as including 24,250 MHz to 52,600 MHz, which is sometimes (interchangeably) referred to as "millimeter wave" ("mmW" or "mmWave"). A base station (e.g., a mmWave base station such as BS180) configured to communicate using mmWave / near mmWave radio bands may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.

[0040] The communication link 120 between the BS 102 and, for example, the UE 104 may be through one or more carriers, which may have different bandwidths (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, and / or other MHz) and may be aggregated in various aspects. The carriers may or may not be adjacent to each other. The 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).

[0041] Communications using higher frequency bands may have higher path loss and shorter range than communications at lower frequencies. Figure 1 180) may utilize beamforming 182 with UE 104 to improve path loss and range. For example, BS 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. In some cases, BS 180 may send beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from BS 180 in one or more receive directions 182". UE 104 may also send beamformed signals to BS 180 in one or more transmit directions 182". BS 180 may also receive beamformed signals from UE 104 in one or more receive directions 182'. BS 180 and UE 104 may then perform beam training to determine an optimal receive direction and an optimal transmit direction for each of BS 180 and UE 104. It is noteworthy that the transmit direction and receive direction of BS 180 may be the same or different. Similarly, the transmit direction and receive direction of UE 104 may be the same or different.

[0042] Wireless communication network 100 also includes Wi-Fi AP 150 that communicates with Wi-Fi station (STA) 152 via communication link 154 in, for example, the 2.4 GHz and / or 5 GHz unlicensed spectrum.

[0043] Certain UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication 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).

[0044] The 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. The MME 162 may communicate with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management.

[0045] Generally speaking, user Internet Protocol (IP) packets are delivered through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation and other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176, which may include, for example, the Internet, an Intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) streaming media service, and / or other IP services.

[0046] The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS delivery, 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 delivery. The MBMS Gateway 168 may be used to distribute MBMS services to BSs 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a specific service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.

[0047] 5GC 190 may include various functional components, including: access and mobility management function (AMF) 192, other AMFs 193, session management function (SMF) 194, and user plane function (UPF) 195. AMF 192 may communicate with unified data management (UDM) 196.

[0048] AMF 192 is a control node that handles signaling between UE 104 and 5GC 190. AMF 192 provides, for example, Quality of Service (QoS) flow and session management.

[0049] Internet Protocol (IP) packets are delivered through UPF 195, which is connected to IP Services 197 and provides IP address allocation for UEs and other functions for 5GC 190. IP Services 197 may include, for example, the Internet, Intranet, IMS, PS streaming services, and / or other IP services.

[0050] In various aspects, a network entity or network node may be implemented as a converged base station, a decomposed base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0051] Figure 2 An example disaggregated base station 200 architecture is depicted. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that may 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. The CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DU 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RU 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 240.

[0052] Each of these units (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO framework 205) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of these units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units via a wired transmission medium. Additionally or alternatively, these units may include a wireless interface that may include a receiver, transmitter, or transceiver (such as a radio frequency (RF) transceiver) configured to receive signals on a wireless transmission medium or send signals to one or more of the other units, or both.

[0053] In some aspects, CU 210 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), or service data adaptation protocol (SDAP), etc. Each control function can be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 210. CU210 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 specific implementations, CU 210 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 210 may be implemented to communicate with DU 230 for network control and signal transmission.

[0054] DU 230 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 240. In some aspects, 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, etc.) at least in part according to functional divisions such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, DU 230 may further host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 230 or with control functions hosted by CU 210.

[0055] The lower layer functionality may be implemented by one or more RUs 240. In some deployments, the RU 240 controlled by the 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 or physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, the RU 240 may be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 240 may be controlled by the corresponding DU 230. In some scenarios, this configuration may enable the implementation of the DU 230 and the CU 210 in a cloud-based RAN architecture (such as a vRAN architecture).

[0056] The SMO framework 205 may be configured to support RAN deployment and provisioning of non-virtualized network elements 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 operation and maintenance interface (such as an O1 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 lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 210, DU 230, RU 240, and near-RT RIC 225. In some specific implementations, the SMO framework 205 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 211) via the O1 interface. Additionally, in some specific implementations, the SMO framework 205 may communicate directly with one or more RUs 240 via the O1 interface. The SMO framework 205 may also include a non-RT RIC 215 configured to support the functionality of the SMO framework 205 .

[0057] The non-RT RIC 215 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, 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 the near-RT RIC 225 (such as via an A1 interface). The near-RT RIC 225 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 210, one or more DUs 230, or both, and the O-eNB with the near-RT RIC 225.

[0058] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 225, the non-RT RIC 215 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 225 and may be received from a non-network data source or from a network function at the SMO framework 205 or the non-RT RIC 215. 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 of performance and employ AI / ML models to perform corrective actions through the SMO framework 205 (such as via reconfiguration of O1) or via creation of RAN management policies (such as A1 policies).

[0059] Figure 3 Aspects of an example BS 102 and UE 104 are depicted.

[0060] In general, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a to 334t (collectively 334), transceivers 332a to 332t (collectively 332) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). For example, BS 102 can transmit and receive data between BS 102 and UE 104. BS 102 includes a controller / processor 340 that can be configured to implement various functions described herein related to wireless communication.

[0061] In general, the UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a to 352r (collectively 352), transceivers 354a to 354r (collectively 354) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., retrieved from a data source 362) and wireless reception of data (e.g., provided to a data sink 360). The UE 104 includes a controller / processor 380 that can be configured to implement various functions described herein related to wireless communications.

[0062] Regarding example downlink transmissions, BS 102 includes a transmit processor 320 that can receive data from a data source 312 and control information from a controller / processor 340. The control information can be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical HARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), and / or other channels. In some examples, the data can be for a physical downlink shared channel (PDSCH).

[0063] The transmit processor 320 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 320 may also generate reference symbols (such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS)).

[0064] The transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, and / or reference symbols, where applicable, and may provide an output symbol stream to a modulator (MOD) in transceivers 332a to 332t. Each modulator in transceivers 332a to 332t may process a corresponding output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators in transceivers 332a to 332t may be transmitted via antennas 334a to 334t, respectively.

[0065] To receive downlink transmissions, UE 104 includes antennas 352a to 352r that can receive downlink signals from BS 102 and can provide received signals to demodulators (DEMODs) in transceivers 354a to 354r, respectively. Each demodulator in transceivers 354a to 354r can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples to obtain received symbols.

[0066] A MIMO detector 356 may obtain received symbols from all demodulators in transceivers 354a through 354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0067] With respect to example uplink transmissions, the UE 104 also includes a transmit processor 364 that may receive and process data from a data source 362 (e.g., for a PUSCH) and control information from a controller / processor 380 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 364 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 364 may be pre-decoded by a TX MIMO processor 366, if applicable, further processed by modulators in the transceivers 354a to 354r (e.g., for SC-FDM), and transmitted to the BS 102.

[0068] At BS 102, uplink signals from UE 104 may be received by antennas 334 a through 334 t, processed by demodulators in transceivers 332 a through 332 t, detected by MIMO detector 336 if applicable, and further processed by receive processor 338 to obtain decoded data and decoded control information transmitted by UE 104. Receive processor 338 may provide the decoded data to a data sink 339 and the decoded control information to controller / processor 340.

[0069] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.

[0070] The scheduler 344 may schedule UEs to transmit data on the downlink and / or uplink.

[0071] In various aspects, BS 102 may be described as sending and receiving various types of data associated with the methods described herein. In these contexts, "sending" may refer to various mechanisms for outputting data, such as outputting data from a data source 312, a scheduler 344, a memory 342, a transmit processor 320, a controller / processor 340, a TX MIMO processor 330, transceivers 332a to 332t, antennas 334a to 334t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from antennas 334a to 334t, transceivers 332a to 332t, RX MIMO detectors 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0072] In various aspects, the UE 104 may also be described as sending and receiving various types of data associated with the methods described herein. In these contexts, "sending" may refer to various mechanisms for outputting data, such as outputting data from a data source 362, a memory 382, ​​a transmit processor 364, a controller / processor 380, a TX MIMO processor 366, a transceiver 354a to 354t, an antenna 352a to 352t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from an antenna 352a to 352t, a transceiver 354a to 354t, a RX MIMO detector 356, a controller / processor 380, a receive processor 358, a memory 382, ​​and / or other aspects described herein.

[0073] In some aspects, the processor may be configured to perform various operations (such as those associated with the methods described herein) and respectively send (output) data to another interface configured to send data or receive (obtain) data from another interface configured to receive data.

[0074] Figure 4A , Figure 4B , Figure 4C and Figure 4D Describes a method for use in a wireless communication network such as Figure 1 Various aspects of the data structure of the wireless communication network 100).

[0075] Specifically, Figure 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, Figure 4B is a diagram 430 illustrating an example of a DL channel within a 5G subframe, Figure 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and Figure 4D FIG480 is a diagram illustrating an example of UL channels within a 5G subframe.

[0076] Wireless communication systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. Such systems may also support half-duplex operation using time division duplex (TDD). OFDM and single carrier frequency division multiplexing (SC-FDM) will (for example, Figure 4B and Figure 4D The system bandwidth (as depicted in FIG. 1 ) is divided into multiple orthogonal subcarriers. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and / or in the time domain using SC-FDM.

[0077] The wireless communication frame structure may be frequency division duplex (FDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to either DL or UL. The wireless communication frame structure may also be time division duplex (TDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to both DL and UL.

[0078] exist Figure 4A and Figure 4C In the wireless communication frame structure, TDD is used, where D is DL, U is UL, and X is used flexibly between DL / UL. The UE can configure the time slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through the received time slot format indicator (SFI). In the depicted example, the 10ms frame is divided into 10 equally sized 1ms subframes. Each subframe may include one or more time slots. In some examples, each time slot may include 7 or 14 symbols, depending on the time slot format. The subframe may also include micro-slots, which typically have fewer symbols than the entire time slot. Other wireless communication technologies may have different frame structures and / or different channels.

[0079] In certain aspects, the number of slots within a subframe is based on the slot configuration and parameter set. For example, for slot configuration 0, different parameter sets (μ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow for 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and parameter set μ, there are 14 symbols / slot and 2μ slots / subframe. The subcarrier spacing and symbol length / duration are a function of the parameter set. The subcarrier spacing may be equal to 2 μ × 15kHz, where μ is parameter set 0 to 5. Thus, parameter set μ=0 has a subcarrier spacing of 15kHz, and parameter set μ=5 has a subcarrier spacing of 480kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figure 4A , Figure 4B , Figure 4C and Figure 4D An example is provided for slot configuration 0 with 14 symbols per slot and parameter set μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

[0080] like Figure 4A , Figure 4B , Figure 4C and Figure 4DAs depicted in , a resource grid may be used to represent a frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending, for example, over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0081] like Figure 4A As illustrated in FIG. , some of the REs carry data for UEs (eg, Figure 1 and Figure 3 The RS may include a demodulation RS (DMRS) and / or a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and / or a phase tracking RS (PT-RS).

[0082] Figure 4B Examples of various DL channels within a subframe of a frame are illustrated.The Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs), each CCE comprising, for example, nine RE Groups (REGs), each REG comprising, for example, four consecutive REs in an OFDM symbol.

[0083] The primary synchronization signal (PSS) may be in symbol 2 of a particular subframe of a frame. The PSS is transmitted by a UE (e.g., Figure 1 and Figure 3 104) is used to determine subframe / symbol timing and physical layer identification.

[0084] A Secondary Synchronization Signal (SSS) may be within symbol 4 of a specific subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing.

[0085] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DMRS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the system frame number (SFN) and the number of RBs in the system bandwidth. The physical downlink shared channel (PDSCH) carries user data, broadcast system information (such as system information blocks (SIBs)) that is not sent via the PBCH, and / or paging messages.

[0086] like Figure 4CAs illustrated in , some of the REs carry DMRS for channel estimation at the base station (indicated as R for a particular configuration, but other DMRS configurations are possible). The UE may send a DMRS for the PUCCH and a DMRS for the PUSCH. The PUSCH DMRS may be sent, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. UE 104 may send a sounding reference signal (SRS). The SRS may be sent, for example, in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0087] Figure 4D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), 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.

[0088] Overview of CA Cell Group

[0089] In carrier aggregation (CA), cells may be divided into groups referred to as a primary cell group (MCG) and a secondary cell group (SCG). A UE supporting dual connectivity (DC) may establish connections with cells in both the MCG and the SCG. The MCG may be a group including cells in which the UE first initiates a random access channel (RACH) procedure.

[0090] There can be many different types of cells under MCG. A cell used for initial access is called a primary cell (PCell). CA is used to effectively combine the PCell in MCG and the secondary cell (SCell) in MCG. There is also a primary cell called PSCell in SCG, and initial access is initiated for this primary cell under SCG. The PSCell and SCell under SCG can also be effectively combined through CA. Because most signaling messages are transmitted only on PCell and PSCell, the protocol also defines the concept of special cell (SpCell), which refers to PCell and PSCell.

[0091] Overview of Mobility Based on Dynamic Signaling

[0092] Dynamic mobility signaling (eg, L1 and / or L2-centric mobility) can facilitate intra-cell and inter-cell mobility and reduce latency.

[0093] For reference Figure 5 To understand the general concept of L1 / L2-based mobility signaling. As illustrated in the figure, the network can configure (e.g., via RRC signaling) a set of cells for L1 / L2 mobility (referred to herein as the L1 / L2 mobility configured cell set). At any given time, the network can also configure (via L1 / L2 signaling) an L1 / L2 mobility activated cell set, which refers to a group of cells in the configured set that are activated and can be easily used for data and control transfer. The network can also configure (signal) an L1 / L2 mobility deactivated cell set, which refers to a group of cells in the configured set that are deactivated and can be easily activated by L1 / L2 signaling.

[0094] L1 / L2 signaling can be used for mobility management of the active set. For example, L1 / L2 signaling can be used to activate / deactivate cells in the set, select beams within the activated cells, and update / switch PCells. This dynamic signaling can help provide seamless mobility within the activated cells in the set. In other words, as the UE moves, cells from the set are deactivated and activated by L1 / L2 signaling. The cells to be activated and deactivated can be based on various factors, such as signal quality (measurements) and load.

[0095] As in Figure 5 In the example illustrated in , in some cases, all cells in the L1 / L2 mobility configuration cell set may belong to the same DU. This may be similar to carrier aggregation (CA), but the cells may be on the same carrier frequency. The size of the cell set configured for L1 / L2 mobility signaling may vary. In general, the cell set size may be selected to be large enough to cover a meaningful mobility area.

[0096] In some cases, the UE may be provided with a subset of deactivated cells as a candidate cell set from which the UE may autonomously select cells to add to the activated cell set. The decision whether to add a cell from the candidate cell set to the activated cell set may be based on various factors, such as measured channel quality and load information. In some cases, the UE's ability to autonomously select cells to add to the activated cell set may be similar to the UE decision when configured for conditional handover (CHO) to quickly and efficiently add prepared cells.

[0097] Each cell may be served by a RU. Each RU in the RU may have multi-carrier (N CCs) support. In this case, each CC may be a cell (e.g., cell 2 and cell 2' may be different CCs of the same RU). In this case, activation / deactivation may be performed in a carrier group (cell).

[0098] For primary cell (PCell) management, L1 / L2 signaling can be used to set (select) the PCell from pre-configured options within the activated cell set. In some cases, when the new PCell is not from the activated cell set for L1 / L2 mobility, L3 mobility can be used for PCell change (L3 handover). In this case, at L3 handover, RRC signaling can update the cell set for L1 / L2 mobility.

[0099] like Figure 5 As illustrated in , a cell group may be configured for a UE, wherein cell activation and / or deactivation and SpCell updates for the UE are performed at the cell group level. For each cell group eligible to activate the UE via L1 / L2 signaling, the cell group configuration is provided to the UE. The L1 / L2 signaling transmitted by the network to the UE determines the activation state of the configured cell group. If only one cell group may be active at a time (e.g., because the UE may have only one active cell group), the L1 / L2 signaling may guide the UE to perform a cell group switch. If multiple cell groups may be active at a time (based on UE capabilities supporting this feature), the L1 / L2 signaling may guide the UE to perform a cell group update.

[0100] In various aspects of the present disclosure, the configuration of cell groups may support cells belonging to multiple groups. In the simplest case, each cell may be restricted to belonging to only a single cell group.

[0101] According to aspects of the present disclosure, a cell group configuration for L1 / L2 mobility may be provided as a set of various changes (eg, δ) from a configuration of a reference cell group or a reference cell to a new configuration.

[0102] In various aspects of the present disclosure, one or more cells in a cell group may be configured to act as a SpCell for a UE. In these aspects, the SpCell for a UE may be changed through L1 / L2 signaling, while the activated cell group for the UE remains unchanged.

[0103] When the UE moves, some cells may no longer be suitable for L1 / L2 mobility. For example, when the UE moves too far away from some cells, those cells are no longer suitable for L1 / L2 mobility because the UE will not be able to activate those cells without being close to those cells. Although unused cells can be stored in the deactivated cell set in the configured L1 / L2 mobility cell set, the UE may be configured to perform measurements on the deactivated cell set, resulting in power consumption. In this case, it may be preferable to remove those cells from the L1 / L2 mobility cell set, thereby freeing up resources (e.g., memory) of the UE. Even if the UE may be configured not to perform measurements on deactivated cells, the UE may have a capability limitation on the maximum number of cells supported in the configured L1 / L2 mobility cell set.

[0104] Therefore, it is desirable to develop L1 / L2 signaling to remove a cell group from a UE's configured L1 / L2 mobility cell set.

[0105] Aspects related to dynamically signaling a UE to release a configured cell group

[0106] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for L1 / L2 signaling to remove a cell group from a configured L1 / L2 mobility cell set of a UE.

[0107] In various aspects of the present disclosure, techniques are provided for a network entity to signal a UE to utilize a CA configuration with additional configuration elements in order to facilitate L1 / L2 mobility within the configured CA set.

[0108] According to aspects of the present disclosure, the L1 / L2 mobility set configured for a UE may be a subset or may cover the entire CA set at the UE configuration.

[0109] In various aspects of the present disclosure, a cell in a L1 / L2 configured cell set may have a SpCell and / or SCell configuration.

[0110] According to aspects of the present disclosure, when a UE is connected to one cell in a cell group, the UE is connected to the entire cell group.

[0111] In various aspects of the present disclosure, a configuration of an L1 / L2 mobility configuration set (also referred to as L1L2MobilityConfig) includes a SpCell configuration, an SCell configuration, and an L1 measurement configuration for use when a cell is in a deactivated state. More than one SpCell or SCell configuration may be provided for a cell. For example, a list of configurations may be provided for a cell. The actual configuration of the cell to be activated is specified by L1 / L2 signaling.

[0112] According to aspects of the present disclosure, when a cell is updated from an SCell to an SpCell through an L1 / L2 mobility procedure, the SpCell configuration of the cell may be activated.

[0113] In various aspects of the present disclosure, when a cell is updated from a PCell to a SCell through an L1 / L2 mobility procedure, the SCell configuration of the cell may be activated.

[0114] Figure 6 An exemplary set of cell groups configured for a UE according to various aspects of the present disclosure is depicted. As illustrated, the cell group set includes two cell groups, which are labeled "Cell Group 1" and "Cell Group 2". As described herein, the two cell groups may be included in a CA set for the UE, or may cover the entire CA set for the UE. As described herein, when a UE is connected to a cell within a group, the UE connects to each cell within the group. For example, when the UE is connected to a PCell in cell group 1, the UE is also connected to SCell 1 and SCell 2 in cell group 1. As illustrated, each cell is provided with an L1L2MobilityConfig. The L1L2MobilityConfig for each cell includes an SCell configuration and an SpCell configuration. And as described herein, each cell may have more than one SCell configuration and more than one SpCell configuration. For example, a PCell in cell group 1 may be provided with a list of SCell configurations and another list of SpCell configurations. If the PCell in cell group 1 is activated as the SpCell for the UE, the UE will apply the SpCell configuration to connect to the PCell in cell group 1. Similarly, if the PCell in cell group 1 is activated as the SCell for the UE (and, for example, SCell 1 is a new SpCell for the UE), the UE will apply the SCell configuration to connect to the PCell in cell group 1.

[0115] In various aspects of the present disclosure, when a cell group is added to the L1 / L2 mobility cell set, a position in a bitmap is assigned to the cell group and then used by a network entity (e.g., a gNB) to activate and deactivate cells in the cell group. The network entity sets the value of a bit in a DCI or MAC-CE transmitted to the UE to activate and deactivate cells in the cell group corresponding to the bit.

[0116] According to aspects of the present disclosure, another MAC control element or DCI format may include a bit in a bitmap to release a cell group, wherein each cell group corresponds to the same position in the bitmap as the cell group, the position corresponding to the position in the bitmap in the MAC-CE or DCI transmitted to activate and deactivate cells in the cell group. However, the cell is not deactivated, but released and removed from the configuration set for the UE.

[0117] Figure 7 An exemplary call flow 700 between a UE 704 and a network entity 702 according to aspects of the present disclosure is depicted. The network entity 702 may be a Figure 1 and Figure 3 Examples of BS 102 depicted and described or with respect to Figure 2 Similarly, UE 704 may be a node of a decomposed base station. Figure 1 and Figure 3 An example of a UE 104 is depicted and described. However, in other aspects, the UE 104 may be another type of wireless communication device and the BS 102 may be another type of network entity or network node, such as those described herein.

[0118] At 710, via physical (PHY) layer or medium access control (MAC) layer signaling, the network entity sends and the UE receives a configuration including a set of cells configured to serve the UE and support mobility signaling, which is also referred to herein as L1L2MobilityConfig.

[0119] At 720, the network entity sends, and the UE receives, signaling indicating that the cell group for the UE is removed from the set of cells (eg, from the L1L2MobilityConfig of the UE).

[0120] At 730, the UE releases the indicated cell group from the cell set (eg, from the UE's L1L2MobilityConfig).

[0121] At 740, the network entity removes the cell group from the set of cells (eg, from the network record of the UE's L1L2MobilityConfig).

[0122] According to various aspects of the present disclosure, a network entity may send a separate MAC-CE or DCI to release one or more cell groups from a set of configured cells of a UE. Such a separate MAC-CE or DCI may be an example of signaling indicating that a cell group for a UE is removed from a set of cells, such as in Figure 7 At 720 , the UE sends the packet to the network entity and receives the packet from the UE.

[0123] In various aspects of the present disclosure, a network entity may send a bit in L1 / L2 signaling (e.g., a bit reserved in a typical communication system) that is intended to activate or deactivate a cell or cell group in an L1 / L2 mobility process in a typical communication system. Such a bit may be set to a value indicating release of a cell.

[0124] Figure 8 Depicted are exemplary bitmaps 800 and 850 in a MAC-CE for indicating the use of L1 / L2 signaling to release a configured cell in accordance with aspects of the present disclosure. As illustrated, the bitmap 800 or 850 in the MAC-CE may include a plurality of octets, which are labeled as octets 1 to octets M in the bitmap 800. The first octet may include a reserved bit (which is the lowest order bit, denoted as "R") and a set of C fields. In the exemplary bitmap 800, each C field is a bit corresponding to a cell group index configured in the L1 / L2 mobility cell set. In the bitmap 800, the C fields are bits corresponding to the cell group index configured in the L1 / L2 mobility cell set. i =1 indicates the release of the cell group with index i. In addition, there may be an additional octet indicating whether the entire cell group is removed from the CA configuration for the UE or the L1 / L2 mobility configuration is removed only from the cells in the group. In the additional octet, each bit corresponds to a cell group indicated as being released (in ascending order). In the additional octet, 1 may represent an instruction to remove the entire cell group, while 0 may represent an instruction to remove the L1 / L2 mobility configuration only from the cells in the group. The exemplary bitmap 850 has two octets. In the first octet, the C fields C1, C2, and C5 have a value of 1, indicating that the receiving UE will release the cell groups with indices 1, 2, and 5. The second octet in the exemplary bitmap 850 indicates whether the entire cell group is removed from the CA configuration or the L1 / L2 mobility configuration is removed only from the cells. The second octet in the exemplary bitmap 850 does not have any reserved bits, and thus the lowest order bit of the second octet corresponds to the cell group with index 1. The second octet of the exemplary bitmap 850 indicates that the receiving UE should release the entire cell group with index 1, and the UE should only release the L1 / L2 mobility configuration for the cell groups with indices 2 and 5.

[0125] According to aspects of the present disclosure, any errors in such L1 / L2 configuration release signaling described herein will not be catastrophic (i.e., will not result in loss of user data) since the network entity (e.g., gNB) is in full control when the message is sent. For example, if the UE does not receive L1 / L2 signaling indicating the release of one or more cells from the L1 / L2 configuration, then in future signaling indicating the release of the cells, the network entity will simply not utilize the bits for the released cells even if the UE does not receive the MAC message. Most of the time, the signaling is expected to be received by the UE, and the UE can release the memory occupied by the information linked to the released cells. When adding new cells, the network entity can utilize the previously released positions in the bitmap.

[0126] In aspects of the present disclosure, the network entity and the UE do not necessarily need to be synchronized with the released cells, but the network entity and the UE will always be synchronized with respect to the configured cells because these configured cells are signaled by RRC.

[0127] According to various aspects of the present disclosure, a network entity may use enhanced cross-layer signaling for error handling. The network entity may record the PDSCH TB identifier (ID) of the transport block (TB) of the cell that contains the release MAC-CE sent to the UE. When the UE transmits an acknowledgment (ACK) for the corresponding PDSCH TB, the network entity may extract the acknowledged (ACKed) content in the TB and determine that the UE successfully received the MAC-CE. If the UE does not receive (and therefore does not ACK) the MAC CE, the network entity may resend the MAC-CE at a later time.

[0128] Example Operation

[0129] Fig. 9 The method for using a UE (such as Figure 1 and Figure 3 An example of a method 900 for performing wireless communications at a UE 104).

[0130] Method 900 begins at step 905, where a configuration indicating a set of cells configured to serve a UE and support mobility signaling is received via physical (PHY) layer or medium access control (MAC) layer signaling. In some cases, the operation of this step refers to the following steps. Fig.11 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0131] Then, the method 900 proceeds to step 910, in which a signaling indicating that the cell group for the UE is removed from the cell set is received. In some cases, the operation of this step refers to the operation of Fig.11The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0132] Then, the method 900 proceeds to step 915, in which the indicated cell group is released from the cell set. In some cases, the operation of this step refers to the operation of Fig.11 The described circuit for releasing and / or code for releasing may be executed by the circuit and / or the code.

[0133] In one aspect, method 900 or any aspect related thereto may be performed by an apparatus such as Fig.11 The method 900 is performed by a communication device 1100, which includes various components that are operable, configured, or adapted to perform the method 900. The communication device 1100 is described in more detail below.

[0134] It should be noted that Fig. 9 This is merely one example of a method, and other methods including fewer, additional, or alternative steps are also possible consistent with the present disclosure.

[0135] Fig.10 shows a method for use by a network entity such as Figure 1 and Figure 3 BS104) or as regards Figure 2 An example of a method 1000 for wireless communication by a node (such as a DU) of a decomposed base station is discussed.

[0136] Method 1000 begins at step 1005, in which a configuration indicating a set of cells configured to serve a user equipment (UE) and support mobility signaling is sent via physical (PHY) layer or medium access control (MAC) layer signaling. In some cases, the operation of this step refers to the following. Fig.12 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0137] Then, the method 1000 proceeds to step 1010, in which a first signaling is sent to indicate that the cell group for the UE is removed from the cell set. In some cases, the operation of this step refers to the operation of Fig.12 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0138] Then, the method 1000 proceeds to step 1015, in which the indicated cell group is removed from the cell set. In some cases, the operation of this step refers to the operation of Fig.12 The described circuit for removing and / or code for removing, or can be executed by the circuit and / or the code.

[0139] In one aspect, method 1000 or any aspect related thereto may be performed by an apparatus such as Fig.12 The method 1000 is performed by a communication device 1200, which includes various components that are operable, configured, or adapted to perform the method 1000. The communication device 1200 is described in more detail below.

[0140] It should be noted that Fig.10 This is merely one example of a method, and other methods including fewer, additional, or alternative steps are also possible consistent with the present disclosure.

[0141] Example Communication Device

[0142] Fig.11 Depicted are aspects of an exemplary communication device 1100 configured for wireless communication. In some aspects, the communication device 1100 is a user equipment, such as described above with respect to Figure 1 and Figure 3 UE 104 is described.

[0143] The communication device 1100 includes a processing system 1102 coupled to a transceiver 1108 (e.g., a transmitter and / or a receiver). The transceiver 1108 is configured to transmit and receive signals for the communication device 1100, such as the various signals described herein, via an antenna 1110. The processing system 1102 may be configured to perform processing functions for the communication device 1100, including processing signals received by the communication device 1100 and / or to be transmitted by the communication device.

[0144] The processing system 1102 includes one or more processors 1120. In various aspects, such as with respect to Figure 3 As depicted, the one or more processors 1120 may represent one or more of the receive processor 358, the transmit processor 364, the TX MIMO processor 366, and / or the controller / processor 380. The one or more processors 1120 are coupled to the computer-readable medium / memory 1130 via the bus 1106. In certain aspects, the computer-readable medium / memory 1130 is configured to store instructions (e.g., computer-executable code or computer-executable instructions) that, when executed by the one or more processors 1120, cause the one or more processors 1120 to perform operations related to the processing of the computer-readable medium / memory 1130. Fig. 9 The method 900 described herein or any aspect related thereto. It should be noted that reference to a processor performing a function of the communication device 1100 may include one or more processors performing that function of the communication device 1100.

[0145] In the depicted example, the computer readable medium / memory 1130 stores code 1131 (eg, executable instructions) for receiving and code 1132 for releasing. Processing of the codes 1131 to 1132 may cause the communication device 1100 to perform operations related to Fig. 9 The described method 900 or any aspect related thereto.

[0146] The one or more processors 1120 include circuits configured to implement (e.g., execute) code stored in the computer-readable medium / memory 1130, including circuits 1121 for receiving and circuits 1122 for releasing. Processing using circuits 1121-1122 may cause the communication device 1100 to perform operations related to Fig. 9 The described method 900 or any aspect related thereto.

[0147] The various components of the communication device 1100 may provide for performing Fig. 9 Components of the described method 900 or any aspect thereof. For example, components for sending, transmitting, or outputting for sending may include Figure 3 The transceiver 354 and / or antenna 352 and / or Fig.11 The transceiver 1108 and antenna 1110 of the communication device 1100 in FIG. 1 may include Figure 3 The transceiver 354 and / or antenna 352 and / or Fig.11 The transceiver 1108 and antenna 1110 of the communication device 1100 in FIG. Components for releasing may include Figure 3 The receiving processor 358, the controller / processor 380 and / or the memory 382 and / or the UE 104 illustrated in Fig.11 The processor 1120 and the memory 1130 of the communication device 1100.

[0148] Fig.12 Depicted are aspects of an exemplary communication device 1200 configured for wireless communication. In some aspects, the communication device 1200 is a network entity such as Figure 1 and Figure 3 BS102, or as per Figure 2 The node of the decomposed base station in question.

[0149] The communication device 1200 includes a processing system 1205 coupled to a transceiver 1265 (e.g., a transmitter and / or a receiver). In some aspects (e.g., when the communication device 1200 is a network entity), the processing system 1205 can be coupled to a network interface 1275 that is configured to communicate with the communication device 1200 via a communication link (such as, for example, as described herein with respect to Figure 2The processing system 1205 may be configured to perform processing functions for the communication device 1200, including processing signals received by the communication device 1200 and / or to be sent by the communication device 1200.

[0150] The processing system 1205 includes one or more processors 1210. In various aspects, such as with respect to Figure 3 As described, the one or more processors 1210 may represent one or more of the receive processor 338, the transmit processor 320, the TX MIMO processor 330, and / or the controller / processor 340. The one or more processors 1210 are coupled to the computer-readable medium / memory 1235 via the bus 1260. In certain aspects, the computer-readable medium / memory 1235 is configured to store instructions (e.g., computer-executable code or computer-executable instructions) that, when executed by the one or more processors 1210, cause the one or more processors 1210 to perform operations related to the processing of the computer-readable medium / memory 1235. Fig.10 The method 1000 is described. It should be noted that references to a processor performing a function of the communication device 1200 may include one or more processors 1210 performing that function of the communication device 1200.

[0151] In the depicted example, the computer readable medium / memory 1235 stores code (e.g., executable instructions) for sending 1240, code for removing 1245, and code for monitoring 1250. Processing of the code for sending 1240, the code for removing 1245, and the code for monitoring 1250 may cause the communication device 1200 to perform operations related to Fig.10 The method 1000 described herein or any aspect related thereto.

[0152] The one or more processors 1210 include circuits configured to implement (e.g., execute) code stored in the computer-readable medium / memory 1235, including circuits for sending 1215, circuits for removing 1220, and circuits for monitoring 1225. Processing performed by the circuits for sending 1215, the circuits for removing 1220, and the circuits for monitoring 1225 may cause the communication device 1200 to perform operations related to the communication. Fig.10 The method 1000 described herein or any aspect related thereto.

[0153] The various components of the communication device 1200 may provide for performing Fig.10Components of the method 1000 described herein. For example, components for sending, transmitting, or outputting for sending may include Figure 3 The transceiver 332 and / or antenna 334 of the BS 102 and / or Fig.12 The transceiver 1265 and antenna 1270 of the communication device 1200 in FIG. Components for receiving, monitoring or obtaining may include Figure 3 The transceiver 332 and / or antenna 334 of the BS 102 and / or Fig.12 The transceiver 1265 and antenna 1270 of the communication device 1200 in FIG. The components for removal may include Figure 3 The receiving processor 338, the controller / processor 340, the memory 342 and / or the transmitting processor 320 of the BS 102 illustrated in FIG. Fig.12 The processor 1210 and the memory 1235 of the communication device 1200 are illustrated in FIG.

[0154] Sample Clauses

[0155] Specific implementation examples are described in the following numbered clauses:

[0156] Clause 1: A method for wireless communication at a user equipment (UE), the method comprising: receiving, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured to serve the UE and to support mobility signaling; receiving signaling indicating that a cell group for the UE is removed from the cell set; and releasing the indicated cell group from the cell set.

[0157] Clause 2: The method of clause 1, wherein the signaling comprises at least one of downlink control information (DCI) or a MAC control element (MAC CE).

[0158] Clause 3: A method as described in any of clauses 1 to 2, wherein the signaling comprises a first set of bits, each bit in the first set indicating whether to release a cell in a corresponding cell group in the set of cells.

[0159] Clause 4: A method according to clause 3, wherein: the signaling also includes a second set of bits; each bit in the second set corresponds to a cell group in the set; and each bit in the second set indicates at least one of the following: removing the corresponding cell group from the carrier aggregation (CA) configuration for the UE, or releasing the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

[0160] Clause 5: The method of clause 4, wherein releasing the corresponding group of cells comprises removing each cell in the group from the configuration for serving the UE.

[0161] Clause 6: A method according to clause 3, wherein: the signaling also includes a second set of bits; each bit in the second set corresponds to a cell group in the set; and each bit in the second set indicates the release of the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

[0162] Clause 7: A method for wireless communication at a network entity, the method comprising: sending a configuration indicating a set of cells configured to serve a user equipment (UE) and to support mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; sending a first signaling indicating that a cell group for the UE is removed from the cell set; and removing the indicated cell group from the cell set.

[0163] Clause 8: The method of clause 7, wherein the first signaling comprises at least one of downlink control information (DCI) or a MAC control element (MAC CE).

[0164] Clause 9: A method according to any of clauses 7 to 8, wherein the first signalling comprises a first set of bits, each bit in the first set indicating whether a corresponding cell group in the set of cells is released.

[0165] Clause 10: A method according to clause 9, wherein: the first signaling also includes a second set of bits; each bit in the second set corresponds to a cell group in the set; and each bit in the second set indicates at least one of the following: removing the corresponding cell group from the CA configuration for the UE, or releasing the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

[0166] Clause 11: A method according to clause 9, wherein: the first signaling also includes a second set of bits; each bit in the second set corresponds to a cell group in the set; and each bit in the second set indicates the release of the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

[0167] Clause 12: A method according to any one of clauses 7 to 11, the method further comprising: monitoring an acknowledgment (ACK) from the UE during a period of time, the acknowledgment (ACK) acknowledging a transport block (TB) identifier (ID) associated with the first signaling; and sending a second signaling indicating that the cell group for the UE is removed from the cell set in response to a failure to detect the ACK during the period of time.

[0168] Clause 13: An apparatus comprising: a memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the apparatus to perform the method of any one of clauses 1 to 12.

[0169] Clause 14: An apparatus comprising: means for performing the method according to any one of clauses 1 to 12.

[0170] Clause 15: A non-transitory computer readable medium comprising executable instructions which, when executed by a processor of an apparatus, cause the apparatus to perform the method of any one of clauses 1 to 12.

[0171] Clause 16: A computer program product embodied on a computer readable storage medium, the computer readable storage medium comprising code for performing the method according to any one of clauses 1 to 12.

[0172] Additional considerations

[0173] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein do not limit the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Each example may ignore, replace, or add each process or component as appropriate. For example, the described method may be performed in a different order than that described, and various actions may be added, omitted, or combined. Moreover, features equivalent to the descriptions of some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functionality, or structures and functionality that are supplementary or alternative to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the present claims.

[0174] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed using a general purpose processor, a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic components, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.

[0175] The functions described herein can be implemented using hardware, software executed by a processor, or any combination thereof. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, processes, or functions, whether they are described in software, firmware, middleware, microcode, hardware description languages, or other terms. If implemented using software executed by a processor, these functions can be stored as one or more instructions or codes of a computer-readable medium, or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software, firmware, hard wiring, or any combination thereof executed by a processor. The features that implement the functions can also be physically located at different locations, including being distributed so that the parts that implement the functions are implemented at different physical locations.

[0176] Computer-readable medium includes both non-transient computer storage medium and communication medium, and the communication medium includes any medium that promotes the transfer of computer programs from one location to another location.Non-transient storage medium can be any available medium that can be accessed by a general or special computer.As an example and not limited to, non-transient computer-readable medium may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, phase change memory, compact disk (CD) ROM or other optical disk storage device, disk storage device or other magnetic storage device or can be used to carry or store instruction or data structure form of desired program code parts and can be accessed by general or special computer or general or special processor any other non-transient medium.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disks and optical disks include CDs, laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks. Disks can reproduce data magnetically, and optical disks can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0177] 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, ab, ac, bc, and abc, as well as any combination with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0178] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching 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.

[0179] As used herein, "processor," "at least one processor," or "one or more processors" generally refers to a single processor configured to perform one or more operations or multiple processors configured to perform one or more operations together. In the case of multiple processors, the execution of one or more operations may be divided between different processors, but a processor may perform multiple operations, and multiple processors may perform a single operation together. Similarly, "memory," "a memory," "at least one memory," or "one or more memories" generally refers to a single memory configured to store data and / or instructions, or multiple memories configured to store data and / or instructions together.

[0180] The method disclosed herein includes one or more actions for implementing the method. The method actions are interchangeable with each other 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. In addition, the various operations of the method described above may be performed by any appropriate component capable of performing the corresponding function. The component may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors.

[0181] The following claims are not intended to be limited to the various aspects shown herein, but should be given the full scope consistent with the language of the claims. Within the claims, unless otherwise specified, reference to an element in the singular form is not intended to mean "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. Any claim element is not interpreted according to the provisions of 35 U.S.C. § 112 (f) unless the element is explicitly stated using the phrase "parts for...". All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are known or will be known later to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims.

Claims

1. A method for wireless communication at a user equipment (UE), the method comprising: receiving, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured to serve the UE and to support mobility signaling; receiving signaling indicating that a cell group for the UE is removed from the set of cells; as well as The indicated cell group is released from the cell set.

2. The method of claim 1, wherein the signaling comprises at least one of downlink control information (DCI) or a MAC control element (MAC CE). 3 . The method according to claim 1 , wherein the signaling comprises a first set of bits, each bit in the first set indicating whether a corresponding cell group in the set of cells is released.

4. The method according to claim 3, wherein: The signaling further includes a second set of bits; Each bit in the second set corresponds to a group of cells in the set; and Each bit in the second set indicates that the corresponding cell group is removed from a carrier aggregation (CA) configuration for the UE.

5. The method of claim 4, wherein releasing the corresponding group of cells comprises removing each cell in the group from the configuration for serving the UE.

6. The method according to claim 3, wherein: The signaling further includes a second set of bits; Each bit in the second set corresponds to a group of cells in the set; and Each bit in the second set indicates releasing the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

7. A method for wireless communication at a network entity, the method comprising: sending, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured to serve a user equipment (UE) and to support mobility signaling; sending first signaling indicating that a cell group for the UE is removed from the cell set; as well as The indicated group is removed from the set of cells.

8. The method of claim 7, wherein the first signaling comprises at least one of downlink control information (DCI) or a MAC control element (MAC CE). 9 . The method according to claim 7 , wherein the first signaling comprises a first bit set, each bit in the first set indicating whether a corresponding cell group in the cell set is released.

10. The method according to claim 9, wherein: The first signaling further includes a second bit set; Each bit in the second set corresponds to a group of cells in the set; and Each bit in the second set indicates that the corresponding cell group is removed from a carrier aggregation (CA) configuration for the UE.

11. The method according to claim 9, wherein: The first signaling further includes a second bit set; Each bit in the second set corresponds to a group of cells in the set; and Each bit in the second set indicates releasing the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group.

12. The method according to claim 7, further comprising: monitoring, during a period of time, an acknowledgement (ACK) from the UE, the acknowledgement (ACK) acknowledging a transport block (TB) identifier (ID) associated with the first signaling; and Second signaling indicating that the cell group for the UE is removed from the set of cells is sent in response to a failure to detect the ACK during the period of time.

13. A user equipment (UE) configured for wireless communication, the user equipment (UE) comprising: a memory including computer executable instructions; and at least one processor configured to execute the computer-executable instructions and cause the UE to: receiving, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured to serve the UE and to support mobility signaling; receiving signaling indicating that a cell group for the UE is removed from the set of cells; as well as The indicated group is released from the set of cells.

14. The UE of claim 13, wherein the at least one processor is configured to execute the computer-executable instructions and causes the UE to receive the signaling, comprising the at least one processor being configured to execute the computer-executable instructions and causes the UE to receive at least one of downlink control information (DCI) or a MAC control element (MAC CE).

15. The UE according to claim 13, wherein the at least one processor is configured to execute the computer-executable instructions and cause the UE to receive the signaling, including the at least one processor being configured to execute the computer-executable instructions and cause the UE to receive a first set of bits, each bit in the first set indicating whether to release a corresponding cell group in the cell set.

16. The UE according to claim 15, wherein: The at least one processor being configured to execute the computer-executable instructions and causing the UE to receive the signaling includes the at least one processor being configured to execute the computer-executable instructions and further causing the UE to receive a second set of bits; and The at least one processor is configured to execute the computer-executable instructions and further cause the UE to remove a corresponding cell group from a carrier aggregation (CA) configuration for the UE for each bit in the second set, wherein each bit in the second set corresponds to a cell group in the set.

17. The UE according to claim 16, wherein the at least one processor is configured to execute the computer-executable instructions and cause the UE to release the corresponding cell group, including the at least one processor being configured to execute the computer-executable instructions and cause the UE to deactivate each cell in the group so that it stops serving the UE.

18. The UE according to claim 15, wherein: The at least one processor being configured to execute the computer-executable instructions and causing the UE to receive the signaling includes the at least one processor being configured to execute the computer-executable instructions and further causing the UE to receive a second set of bits; and The at least one processor is configured to execute the computer-executable instructions and further cause the UE to release the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group for each bit in the second set, wherein each bit in the second set corresponds to a cell group in the set.

19. A network entity configured for wireless communication, the network entity comprising: a memory including computer executable instructions; and at least one processor configured to execute the computer executable instructions and cause the network entity to: sending, via physical (PHY) layer or medium access control (MAC) layer signaling, a configuration indicating a set of cells configured to serve a user equipment (UE) and to support mobility signaling; sending first signaling indicating that a cell group for the UE is removed from the cell set; as well as The indicated group is removed from the set of cells.

20. The network entity of claim 19, wherein the at least one processor is configured to execute the computer-executable instructions and cause the network entity to send the first signaling comprises the at least one processor being configured to execute the computer-executable instructions and cause the network entity to send at least one of downlink control information (DCI) or a MAC control element (MAC CE).

21. The network entity of claim 19, wherein the at least one processor is configured to execute the computer-executable instructions and cause the network entity to send the first signaling, comprising the at least one processor being configured to execute the computer-executable instructions and cause the network entity to send a first set of bits, each bit in the first set indicating whether to release a corresponding cell group in the cell set.

22. The network entity according to claim 21, wherein: The at least one processor being configured to execute the computer-executable instructions and causing the network entity to transmit the first signaling comprises the at least one processor being configured to execute the computer-executable instructions and further causing the network entity to transmit a second set of bits; and The at least one processor is configured to execute the computer-executable instructions and further cause the network entity to indicate to the UE that a corresponding cell group is removed from a carrier aggregation (CA) configuration for the UE, wherein each bit in the second set corresponds to a cell group in the set.

23. The network entity according to claim 21, wherein: The at least one processor being configured to execute the computer-executable instructions and causing the network entity to transmit the first signaling comprises the at least one processor being configured to execute the computer-executable instructions and further causing the network entity to transmit a second set of bits; and The at least one processor is configured to execute the computer-executable instructions and further cause the network entity to indicate to the UE to release the PHY layer or MAC layer mobility signaling configuration for each cell in the corresponding cell group, wherein each bit in the second set corresponds to a cell group in the set.

24. The network entity of claim 19, wherein the at least one processor is configured to execute the computer executable instructions and further cause the network entity to: monitoring, during a period of time, an acknowledgement (ACK) from the UE, the acknowledgement (ACK) acknowledging a transport block (TB) identifier (ID) associated with the first signaling; and Second signaling indicating that the cell group for the UE is removed from the set of cells is sent in response to a failure to detect the ACK during the period of time.

Images