Coordination of cell measurements and mobility cross reference

Abstract

Certain aspects of the present disclosure provide a method of wireless communication. One example method performed at a first network entity includes receiving a measurement report from a user equipment (UE) supporting dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, wherein the measurement report includes at least one of a PHY layer measurement or a MAC layer measurement; and sending the measurement report to the second network entity based on the event trigger.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. patent application serial number 18 / 347,196 filed on July 5, 2023, which claims the benefit of and priority to U.S. Provisional Application No. 63 / 396,211 filed on August 8, 2022, and U.S. Provisional Application No. 63 / 370,779 filed on August 8, 2022, which applications are assigned to the assignee of this application and are hereby expressly incorporated by reference in their entirety as if fully set forth below and for all applicable purposes. Background Art Technical Field

[0003] Aspects of the present disclosure relate to wireless communications, and more particularly to techniques to support mobility of user equipment (UE) between cells that support cell changes via dynamic signaling.

[0004] Related technologies

[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 first network entity. The method includes: receiving a measurement report from a user equipment (UE) supporting dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, wherein the measurement report includes at least one of a PHY layer measurement or a MAC layer measurement; and sending the measurement report to a second network entity based on an event trigger.

[0008] In another aspect, a method for wireless communication at a second network entity is provided. The method includes: configuring a user equipment (UE) for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; and receiving, based on an event trigger, a measurement report from a first network entity including at least one of a PHY layer measurement or a MAC layer measurement performed by the UE.

[0009] Another aspect provides a method for wireless communication at a first network entity. The method includes: sending information about one or more cell group configurations of the first network entity to a second network entity; and receiving signaling from the second network entity identifying at least a third network entity and one or more cells served by the at least third network entity.

[0010] Another aspect provides a method for wireless communication at a second network entity. The method includes: receiving information about one or more cell group configurations from at least a first network entity; determining a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling from the one or more cell group configurations; and sending signaling to at least a first network entity affiliated with the configured cell set to identify at least the first network entity and a cell served by the at least first network entity.

[0011] 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.

[0012] For purposes of illustration, the following detailed description and drawings set forth certain features. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings depict certain features of the various aspects described herein and should not be considered to limit the scope of the disclosure.

[0014] Figure 1 An example wireless communication network is depicted.

[0015] Figure 2 An example disaggregated base station architecture is depicted.

[0016] Figure 3 Aspects of an example base station and example user equipment are depicted.

[0017] Figure 4A , Figure 4B , Figure 4C and Figure 4D Various example aspects of data structures for a wireless communication network are described.

[0018] Figure 5

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

[0019] Figure 6 , Figure 7 , Figure 8 and Fig. 9 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0020] Fig.10 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0021] Fig.11

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

[0022] Fig.12 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0023] Fig.13 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0024] Fig.14

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

[0025] Fig.15 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0026] Fig.16 Depicted is an example call flow diagram for configuring mobility based on dynamic signaling in accordance with some aspects of the present disclosure.

[0027] Fig.17 A method for wireless communication is described.

[0028] Fig.18 A method for wireless communication is described.

[0029] Fig.19 A method for wireless communication is described.

[0030] Fig. 20 A method for wireless communication is described.

[0031] Fig.21 Aspects of an example communications device are depicted. DETAILED DESCRIPTION

[0032] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for supporting mobility of user equipment (UE) between cells, which support cell changes via dynamic signaling.

[0033] In advanced wireless systems, mobility and beam management procedures appropriately help maintain network connectivity for user equipment (UE) as it moves between coverage areas of different cells. Mobility procedures generally refer to mechanisms that allow a UE to transition from being served by a source cell to being served by a target cell. Beam management procedures generally refer to mechanisms for selecting beams suitable for communicating with network entities of one or more cells, such as transmit receive points (TRPs).

[0034] In multi-beam operation, more efficient uplink / downlink beam management may allow increased intra-cell and inter-cell mobility (e.g., L1 and / or L2-centric mobility) and / or a larger number of transmission configuration indicator (TCI) states. For example, these states may enable the use of common beams for transmission and reception of data and control for UL and DL operations and enhanced signaling mechanisms for improved latency and efficiency.

[0035] In some cases, one or more components of a base station may be disaggregated, including a central unit (CU), one or more distributed units (DUs), and one or more radio units (RUs). In such cases, the CU may communicate with one or more DUs via corresponding midhaul links (such as an F1 interface), and the DU may communicate with one or more RUs via corresponding fronthaul links. The RU may represent a cell and may communicate with a corresponding UE via one or more radio frequency (RF) access links.

[0036] One challenge in implementing L1 / L2 based inter-cell mobility in such a disaggregated system is how to communicate between different components when needed. For example, various types of information may need to be exchanged between CU and DU or between DUs to support L1 / L2 based inter-cell mobility.

[0037] Various aspects of the present disclosure provide various mechanisms and options for CU-DU interface signaling to support L1 / L2-based inter-cell mobility. The mechanisms proposed herein help define the responsibilities of each node during L1 / L2 mobility. These mechanisms also allow the DU to be informed of cells served by other DUs, which are part of a set of cells configured to support L1 / L2-based inter-cell mobility (referred to herein as a configured cell set); and also allow the CU and DU to be informed of changes in the inter-DU primary serving cell (PCell). When the UE moves between cells, the mechanisms proposed herein can help reduce latency and achieve efficient use of signaling resources.

[0038] Introduction to wireless communication networks

[0039] 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.

[0040] Figure 1 An example of a wireless communication network 100 is depicted in which various aspects described herein may be implemented.

[0041] 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.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] BS 102 may generally include: NodeB, enhanced NodeB (eNB), next generation enhanced NodeB (ng-eNB), next generation NodeB (gNB or gNodeB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmit and receive point, and / or other base stations. Each BS in BS 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 the 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 (relatively small geographic area (e.g., a home)), and / or other types of cells.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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).

[0050] 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.

[0051] 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.

[0052] 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).

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 (converged or decomposed) base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0060] 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.

[0061] Each of the 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, 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.

[0062] 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), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface 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 signaling.

[0063] 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 a functional split such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, DU 230 may also 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.

[0064] The lower layer functionality may be implemented by one or more RUs 240. In some deployments, a RU 240 controlled by a DU 230 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing Fast Fourier Transform (FFT), Inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on a functional split (such as a lower layer functional split). 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 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).

[0065] 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 to instantiate 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 .

[0066] 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 in communication 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.

[0067] 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 the creation of RAN management policies (such as A1 policies).

[0068] Figure 3 Aspects of an example BS 102 and UE 104 are depicted.

[0069] 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.

[0070] 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.

[0071] 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).

[0072] 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)).

[0073] 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.

[0074] 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.

[0075] 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 the UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0076] 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.

[0077] 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 decoded data to data sink 339 and decoded control information to controller / processor 340.

[0078] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.

[0079] The scheduler 344 may schedule UEs to transmit data on the downlink and / or uplink.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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).

[0084] 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.

[0085] 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 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] like Figure 4A , Figure 4B , Figure 4C and Figure 4DAs depicted, a resource grid may be used to represent a frame structure. Each 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.

[0090] like Figure 4A As illustrated in FIG. 1 , some of the REs carry data for the UE (eg, FIG. 10 and FIG. 11 ). 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).

[0091] 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.

[0092] 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.

[0093] The Secondary Synchronization Signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing.

[0094] Based on the physical layer identifier and the physical layer cell identifier 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 number of RBs in the system bandwidth and the system frame number (SFN). 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.

[0095] like Figure 4CAs illustrated in , some of the REs carry DMRS for channel estimation at the base station (indicated as R for a specific 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. UE104 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.

[0096] 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 be used to carry, among other things, buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0097] Overview of CA Cell Group

[0098] 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.

[0099] There can be many different types of cells under MCG. One cell used for initial access is called the 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, for which initial access is initiated 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.

[0100] Overview of Mobility Based on Dynamic Signaling

[0101] Dynamic mobility signaling (e.g., L1 and / or L2-centric mobility) may lead to more efficient beam management and may facilitate intra-cell and inter-cell mobility with reduced latency.

[0102] For reference Figure 5 To understand the general concept of L1 / L2-based mobility signaling. As illustrated, the network may configure a cell set 510 (referred to herein as the L1 / L2 mobility configured cell set) for L1 / L2 mobility (e.g., via RRC signaling). At any given time, the network may also configure (via L1 / L2 signaling) an L1 / L2 mobility activated cell set 512, which refers to a set of cells in the configured set that are activated and can be easily used for data and control transfer. The network may also configure (signal) an L1 / L2 mobility deactivated cell set, which refers to a set of cells in the configured set that are deactivated and can be easily activated by L1 / L2 signaling.

[0103] 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.

[0104] 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 230 associated with the CU 210. 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.

[0105] In some cases, the UE may be provided with a subset of deactivated cells as a candidate cell set 514 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.

[0106] like Figure 5As illustrated in , 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).

[0107] 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.

[0108] Overview of configuration for dynamic signaling based mobility

[0109] How the UE and network components (eg, DU) are specifically configured for dynamic signaling (L1 / L2) based mobility may depend on a specific procedure for transmitting corresponding configuration information.

[0110] For example, Figure 6 As illustrated in call flow diagram 600 of , during the initial access process of the UE, the DU may generate cell group configuration information. The DU may transmit this information to the CU, for example, via the DU to CU RRC container IE in the initial UL RRC message transfer (at step 2). Then at steps 3-4, the CU may signal the L1 / L2 mobility configuration to the UE in an RRC setup message, which may be transparent to the DU. In some cases, at step 11, the DU may also generate cell group configuration information and transmit the information to the CU (e.g., via the DU to CU RRC information IE in the UE context setup response). As illustrated in the figure, at steps 14-15, the CU may then signal the L1 / L2 mobility configuration information to the UE, for example, in an RRC reconfiguration message (which may be transparent to the DU because the DU may simply forward the message).

[0111] like Figure 7 As illustrated in the call flow diagram 700 of FIG. 7 , during the RRC reestablishment process, the DU may generate and transmit the cell group configuration information to the CU. For example, the cell group configuration information may be transmitted via the DU to CU RRC Information IE in the UE Context Modification Response message (step 10) or the UE Context Modification Request message (step 9'). At steps 11-12, the CU may then signal the L1 / L2 mobility configuration information to the UE (e.g., in an RRC reconfiguration message) (which may be transparent to the DU).

[0112] like Figure 8 As illustrated in the call flow diagram 800 of , during the RRC recovery process, the DU may generate cell group configuration information and transmit the information to the CU (e.g., via the DU to CU RRC Information IE in the UE context setup response). At steps 7-8, the CU may then signal the L1 / L2 mobility configuration information to the UE (e.g., in an RRC reconfiguration message, transparent to the DU).

[0113] like Fig. 9 As illustrated in the call flow diagram 900 of FIG. 1 , during the inter-DU mobility update procedure (where the UE moves from a source DU to a target DU), at step 4, the target DU may update the cell group configuration information and transmit the information to the CU (e.g., via a UE context setup response DU to CU RRC information IE). At steps 5-6, the CU may signal the L1 / L2 mobility configuration information to the UE (e.g., in an RRC reconfiguration message, transparent to the DU).

[0114] Aspects related to coordination of L1 / L2 measurements for L1 / L2 based mobility

[0115] Various aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for supporting UE mobility between cells, which support cell changes via dynamic signaling. Mobility based on dynamic signaling is referred to herein as L1 / L2-based inter-cell mobility because it is based on a physical (PHY) layer (Layer 1 / L1) or medium access control (MAC) layer (Layer 2 / L2) signaling mechanism. These mechanisms may include PDCCH / DCI for L1 and MAC control element (MAC CE) for L2.

[0116] As described above, one potential challenge in implementing L1 / L2-based inter-cell mobility in a decomposed system is how to communicate between different network entities (e.g., components of a decomposed base station). For example, various types of information may need to be exchanged between a CU and a DU, between DUs, or between CUs to support L1 / L2-based inter-cell mobility. Various aspects of the present disclosure provide various mechanisms and options for signaling between network entities (e.g., via a CU-DU interface, a DU-DU interface, or a CU-CU interface) to support L1 / L2-based inter-cell mobility.

[0117] In a system supporting L1 / L2-based inter-cell mobility, components in a decomposed base station (gNB), such as DU and CU, may have different responsibilities.

[0118] For example, the DU may be responsible for obtaining L1 / L2 measurements from the UE. The DU may use these measurements to determine which cells to activate / deactivate within the configured cell set. The DU may also use these measurements to determine when to switch PCells within the activated cell set. The mechanism proposed herein may help ensure that the DU is able to obtain L1 / L2 measurement reports from the UE.

[0119] Various aspects of the present disclosure provide options for signaling between network entities to support L1 / L2 mobility. According to certain aspects, the mechanisms provided herein may help the CU collect L1 / L2 measurements from the DU. According to certain aspects, the mechanisms provided herein may allow the DU to subscribe to L1 / L2 measurements.

[0120] It may be beneficial for the DU to be able to transmit L1 / L2 measurement reports obtained from the UE to the CU in a transparent container.There are various options for how the DU may transmit the measurement reports, for example based on one or more event triggers.

[0121] Fig.10 An example of signaling between network entities for supporting L1 / L2 mobility is illustrated. Fig.10 The call flow diagram 1000 involves signaling between a CU and a DU, but the technology may be applied to signaling between other types of network entities, such as signaling between DUs (DU-DU) or between CUs (CU-CU).

[0122] like Fig.10 As illustrated in the call flow diagram 1000 of FIG. 1 , according to the first option, the event trigger may correspond to a request from the CU, or the event trigger may occur periodically, once, upon a certain condition event trigger, or upon receiving a measurement report from the UE. The measurement report may be transmitted in response to the request. As illustrated in the figure, the DU may include other information with the measurement report, such as a timestamp of the L1 / L2 measurement and a DU ID and a target cell ID. In some cases, the DU ID and the target cell ID may be determined as part of the cell group configuration process (e.g., as described below for Fig.13 , Fig.19 and Fig. 20 discussed).

[0123] like Fig.11 As illustrated in the call flow diagram 1100 of FIG. 11 , according to the second option, the DU may autonomously transmit the measurement report to the CU. In the case of autonomous reporting by the DU, the DU may also indicate, for example, the target DU ID and the target cell ID to which the L1 / L2 measurement report is to be forwarded. An example of an event trigger condition or a condition for triggering autonomous reporting may be based on radio quality. For example, if the absolute channel quality or the relative channel quality exceeds or falls below a threshold, a report may be triggered.

[0124] In some cases, the measurement report may be transmitted in a non-response message of the basic procedure (EP) (such messages may be referred to as type 2 messages) or in an application protocol (AP) message. For example, the measurement may be transmitted in a new type 2 message or in an existing F1 AP message (reused for this purpose).

[0125] like Fig.12 As illustrated in call flow diagram 1200 of , in some cases, a DU can selectively request or subscribe to L1 / L2 measurement reports from a subset of certain cells or SSB beams belonging to one or more other DUs.

[0126] exist Fig.12 In the example illustrated in , the first DU (DU3 2303) transmits a request (to subscribe) to the CU 210 to receive L1 / L2 measurements from other DUs (DU1 2301 and DU2 2302).

[0127] As illustrated in the figure, in such a case, the CU can effectively act as a transparent relay node and forward the L1 / L2 measurements received from different DUs (DU1 and DU2) to the requesting DU (e.g., DU3 in the case of reservation). The CU can also forward the measurement reports to the target DU (in the case of autonomous collection at the CU) or autonomously forward them to the "primary serving DU" based on the CU's own knowledge to assist PCell switching.

[0128] The DU may use the measurements to determine which cells to activate / deactivate within the configured cell set, and / or when to switch PCells within the activated cell set.

[0129] The mechanisms proposed in this article can also help define the responsibilities of various nodes during L1 / L2 mobility. These mechanisms can allow network entities to be informed of cells served by other network entities, which are part of a set of cells configured to support L1 / L2-based inter-cell mobility (referred to as a configured cell set in this article). For example, these mechanisms can allow DUs to be informed of cells served by other DUs, which are part of a set of cells configured to support L1 / L2-based inter-cell mobility; and also allow CUs and DUs to be informed of changes in the inter-DU primary serving cell (PCell). When the UE moves between cells, the mechanisms proposed in this article can help reduce latency and achieve efficient use of signaling resources.

[0130] In a system supporting L1 / L2-based inter-cell mobility, components in a decomposed base station (gNB), such as DU and CU, may have different responsibilities.

[0131] For example, the DU may be responsible for obtaining L1 / L2 measurements from the UE and determining which cells to activate / deactivate (from the configured cell set) and when to switch the PCell within the activated cell set. The DU may also be responsible for providing the CU with the cell group configuration of its serving cells (e.g., via the CellGroupConfig information element-IE). The configuration may also indicate the cell set of interest for configuring L1 / L2 mobility during initial access, reestablishment, recovery, and inter-DU mobility (e.g., reference 1 to 1). Figure 6 , Figure 7 , Figure 8 and Fig. 9 described above).

[0132] In some cases, the DU may also provide the CU with multiple cell group configurations (which may constitute a set of configured cells for L1 / L2 mobility). After receiving the cell group configurations from the DU(s), the CU may be responsible for deciding the final set of cells configured for L1 / L2-based mobility.

[0133] The CU-DU signaling mechanism proposed herein may enable a CU to inform different DUs (whose cells constitute the configured cell set for L1 / L2 mobility) of their neighbor DU identities and the corresponding cell identities served by those corresponding DUs.

[0134] An example of the CU-DU signaling mechanism proposed in this paper can be found in Fig.13 1300 for understanding.

[0135] As illustrated, the CU may receive information about one or more cell group configurations from one or more distributed units (DUs). In the illustrated example, the CU receives a first cell group configuration from a first DU (DU1) identifying cell 1, cell 2, and cell 3. The CU receives a second cell group configuration from a second DU (DU2) identifying cell 4 and cell 5.

[0136] The CU may then decide from one or more cell group configurations to configure a first set of cells for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling. In the illustrated example, the CU decides to configure cell 1, cell 2, and cell 4 for L1 / L2-based inter-cell mobility.

[0137] The CU may then send signaling to one or more DUs attached to the configured cell set to identify the one or more DUs and the cells served by the one or more DUs. In some cases, the signaling may indicate the identities of the DUs and the configured cell sets served by those DUs.

[0138] In the illustrated example, the CU sends L1 / L2 mobility assistance information, which informs DU2 of DU1 and cell 1 and cell 2 configured for L1 / L2 mobility, and informs DU1 of DU2 and cell 4 configured for L1 / L2 mobility. In some cases, the signaling may include a basic procedure (EP) unresponsive message (such a message may be referred to as a Class 2 message) or an application protocol (AP) message. For example, the assistance information may be transmitted in a new Class 2 message or in an existing F1 AP message (reused for this purpose).

[0139] The CU-DU signaling mechanism proposed in this article can also enable the communication of information about DU Pcell changes. Fig.14 The information of the PCell change shown in diagram 1400 is communicated from the source PCell (cell 2 attached to DU1) to the target PCell (cell 4 attached to DU2).

[0140] There are various options for how the CU can be notified after the inter-cell DU PCell switching. According to the first option, Fig.15 As illustrated in the call flow diagram 1500 of , the source DU (the DU with the source PCell) can inform the CU of the PCell switch. As illustrated in the figure, the information flow in this example is from DU1 to CU to DU2.

[0141] As illustrated, DU1 may decide to switch PCell (eg, switch to cell 4 of DU2 based on L1 / L2 measurement reports). DU1 may trigger the switch via a MAC CE or DCI transmitted to the UE. The UE may explicitly or implicitly acknowledge (ACK) the PCell switch.

[0142] In this example, DU1 informs the CU of the PCell switch via a PCell switch indication message. As illustrated, the indication may include UE ID, source DU ID, source PCell ID, target DU ID, and target PCell ID. The CU may then inform the target DU of the switch (e.g., by forwarding the PCell switch indication). In some cases, the PCell switch indication may be transmitted in a new Class 2 message or in an existing F1AP message (reused for this purpose).

[0143] According to the second option, Fig.16 As illustrated in the call flow diagram 1600 of FIG. 1600 , the target DU (the DU with the target PCell) may inform the CU of the PCell switch. As illustrated in the figure, the information flow in this example is from DU2 to CU to DU1.

[0144] and Fig.15As in the example of , DU1 may decide to switch PCell and may trigger the switch via a MAC CE or DCI transmitted to the UE. The UE may explicitly or implicitly acknowledge (ACK) the PCell switch.

[0145] However, in this example, the UE may confirm the PCell switch to the target DU (DU2). In some cases, to allow the UE to inform the target DU, dedicated resources (eg, scheduling request SR resources) may be used to confirm the PCell switch.

[0146] After receiving the confirmation, DU2 may inform the CU of the PCell switch via a PCell switch indication message. As described above, the indication may include UE ID, source DU ID, source PCell ID, target DU ID, and target PCell ID. The CU may then inform the source DU (DU1) of the switch (e.g., by forwarding the PCell switch indication).

[0147] Example Operation

[0148] Fig.17 It is shown that at a first network entity (such as Figure 1 and Figure 3 BS102 or as for Figure 2 An example of a method 1700 for performing wireless communications at a decomposed base station) as discussed.

[0149] Method 1700 begins at step 1705, where a measurement report is received from a user equipment (UE) that supports dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, where the measurement report includes at least one of a PHY layer measurement or a MAC layer measurement. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0150] Method 1700 then proceeds to step 1710, where, based on the event trigger, a measurement report is sent to the second network entity. In some cases, the operation of this step refers to the following example. Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0151] In some aspects, the measurement report is sent via: a non-response message of an elementary procedure (EP); or an application protocol (AP) message.

[0152] In some aspects, the measurement report includes at least one timestamp associated with a PHY layer measurement or a MAC layer measurement.

[0153] In some aspects, the event trigger comprises receipt of a measurement report from the UE.

[0154] In some aspects, the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

[0155] In some aspects, the first network entity includes a first distributed unit (DU); and the second network entity includes a centralized unit (CU).

[0156] In some aspects, the event trigger comprises receiving a request from the CU; and the measurement report is sent in response to the request.

[0157] In some aspects, the method 1700 further comprises subscribing to receive measurement reports having at least one of PHY layer measurements or MAC layer measurements from at least a second DU. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuit for booking and / or code for booking, or executable by the circuit and / or the code.

[0158] In some aspects, the method 1700 further includes receiving from the CU a measurement report that the first DU has subscribed to receive from at least the second DU. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0159] In some aspects, the method 1700 further includes receiving, from the CU, a measurement report having at least one of a PHY layer measurement or a MAC layer measurement from at least a second DU. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0160] In some aspects, the method 1700 further includes making a primary serving cell (PCell) switching decision based on the measurement report from at least the second DU. In some cases, the operation of this step refers to the Fig.21 The described circuits for performing actions and / or codes for performing actions may be performed by or may be executed by the circuits and / or codes.

[0161] In some aspects, the measurement report includes at least one target DU identifier and at least one target cell identifier.

[0162] In some aspects, the method 1700 further includes sending information about one or more cell group configurations of the first DU to the CU. In some cases, the operation of this step refers to the following Fig.21The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0163] In some aspects, the method 1700 further includes receiving signaling from the CU identifying at least a second DU associated with the target DU identifier, and one or more cells served by the at least one second DU, the one or more cells including the cell associated with the target cell identifier. In some cases, the operation of this step refers to as described in reference to Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0164] In some aspects, the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

[0165] In one aspect, method 1700 or any aspect related thereto may be performed by an apparatus such as Fig.21 The method 1700 is performed by a communication device 2100 that includes various components that are operable, configured, or adapted to perform the method 1700. The communication device 2100 is described in more detail below.

[0166] Please note that Fig.17 This is merely one example of a method, and other methods including fewer, additional, or alternative steps may also be consistent with the present disclosure.

[0167] Fig.18 In the second network entity (such as Figure 1 and Figure 3 BS102 or as for Figure 2 An example of a method 1800 for performing wireless communications at a decomposed base station) as discussed.

[0168] Method 1800 begins at step 1805, where a user equipment (UE) is configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling. In some cases, the operation of this step refers to the Fig.21 The described circuits for configuration and / or codes for configuration may be executed by the circuits and / or the codes.

[0169] Method 1800 then proceeds to step 1810, where, based on the event trigger, a measurement report including at least one of a PHY layer measurement or a MAC layer measurement performed by the UE is received from the first network entity. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0170] In some aspects, the measurement report is received via: an elementary procedure (EP) non-response message; or an application protocol (AP) message.

[0171] In some aspects, the measurement report includes at least one timestamp associated with a PHY layer measurement or a MAC layer measurement.

[0172] In some aspects, the first network entity includes a first distributed unit (DU); and the second network entity includes a centralized unit (CU).

[0173] In some aspects, the event trigger comprises receiving a request from the CU; and the measurement report is sent in response to the request.

[0174] In some aspects, the event trigger comprises receipt, by the first DU, of a measurement report from the UE.

[0175] In some aspects, the method 1800 further includes sending to the first DU a measurement report that the first DU has subscribed to receive from at least the second DU. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0176] In some aspects, the measurement report includes at least one target DU identifier and at least one target cell identifier.

[0177] In some aspects, the method 1800 further includes receiving information about one or more cell group configurations from one or more DUs. In some cases, the operation of this step refers to the Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0178] In some aspects, the method 1800 further includes determining, from the one or more cell group configurations, a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuit for deciding and / or code for deciding may be performed by the circuit and / or the code.

[0179] In some aspects, the method 1800 further includes sending signaling to at least the first DU identifying at least a second DU associated with the target DU identifier, and one or more cells served by at least one second DU, the one or more cells including the cell associated with the target cell identifier. In some cases, the operation of this step refers to as described in reference to Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0180] In one aspect, method 1800 or any aspect related thereto may be performed by an apparatus such as Fig.21 The method 1800 is performed by a communication device 2100 that includes various components that are operable, configured, or adapted to perform the method 1800. The communication device 2100 is described in more detail below.

[0181] Please note that Fig.18 This is merely one example of a method, and other methods including fewer, additional, or alternative steps may also be consistent with the present disclosure.

[0182] Fig.19 It is shown that at a first network entity (such as Figure 1 and Figure 3 BS102 or as for Figure 2 An example of a method 1900 for performing wireless communications at a decomposed base station) as discussed.

[0183] Method 1900 begins at step 1905, where information about one or more cell group configurations of a first network entity is sent to a second network entity. In some cases, the operation of this step refers to the following steps. Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0184] Method 1900 then proceeds to step 1910, where signaling identifying at least a third network entity and one or more cells served by the at least third network entity is received from the second network entity. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0185] In some aspects, at least the first network entity includes a first distributed unit (DU); the second network entity includes a centralized unit (CU); and the third network entity includes a second DU.

[0186] In some aspects, the method 1900 further includes sending an indication to the second network entity of a primary serving cell (PCell) handover of a user equipment (UE), the handover being from a first cell served by the first network entity to a second cell served by the third network entity, or from a second cell served by the third network entity to a first cell served by the first network entity. In some cases, the operation of this step refers to as described in reference to Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0187] In some aspects, the indication includes: an ID of the UE, an ID of the first network entity, an ID of the first cell, an ID of the third network entity, and an ID of the second cell.

[0188] In one aspect, method 1900 or any aspect related thereto may be performed by an apparatus such as Fig.21 The method 1900 is performed by a communication device 2100 that includes various components that are operable, configured, or adapted to perform the method 1900. The communication device 2100 is described in more detail below.

[0189] Please note that Fig.19 This is merely one example of a method, and other methods including fewer, additional, or alternative steps may also be consistent with the present disclosure.

[0190] Fig. 20 In the second network entity (such as Figure 1 and Figure 3 BS102 or as for Figure 2 An example of a method 2000 for performing wireless communications at a decomposed base station) as discussed.

[0191] Method 2000 begins at step 2005, where information about one or more cell group configurations is received from at least a first network entity. In some cases, the operation of this step refers to the operation described in reference to Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0192] Method 2000 then proceeds to step 2010, where a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling is determined from one or more cell group configurations. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuit for deciding and / or code for deciding may be performed by the circuit and / or the code.

[0193] Method 2000 then proceeds to step 2015, where signaling is sent to at least a first network entity affiliated with the configured cell set to identify at least the first network entity and the cell served by the at least first network entity. In some cases, the operation of this step refers to as described in reference Fig.21 The described circuits for transmitting and / or codes for transmitting, or may be executed by the circuits and / or the codes.

[0194] In some aspects, at least the first network entity includes at least a first distributed unit (DU); and the second network entity includes a centralized unit (CU).

[0195] In some aspects, the method 2000 also includes receiving an indication of a primary serving cell (PCell) switch for a user equipment (UE) from a first cell served by a first DU to a second cell served by a second DU. In some cases, the operation of this step refers to the following steps: Fig.21 The described circuits for receiving and / or codes for receiving may be or may be executed by the circuits and / or codes.

[0196] In some aspects, the method 2000 further includes forwarding an indication of the PCell switching to the first DU or the second DU. In some cases, the operation of this step refers to the operation of Fig.21 The described circuit for forwarding and / or code for forwarding may be performed by the circuit and / or the code.

[0197] In some aspects, the indication of the PCell switch is received from the first DU; and the method further includes sending the indication of the PCell switch to the second DU.

[0198] In one aspect, method 2000 or any aspect related thereto may be performed by an apparatus such as Fig.21 The method 2000 is performed by a communication device 2100 that includes various components that are operable, configured, or adapted to perform the method 2000. The communication device 2100 is described in more detail below.

[0199] Please note that Fig. 20 This is merely one example of a method, and other methods including fewer, additional, or alternative steps may also be consistent with the present disclosure.

[0200] Example Communication Device

[0201] Fig.21 Various aspects of an example communication device 2100 are depicted. In some aspects, the communication device 2100 is a network entity such as Figure 1 and Figure 3 BS102 or as for Figure 2 The decomposed base station in question.

[0202] The communication device 2100 includes a processing system 2102 coupled to a transceiver 2138 (e.g., a transmitter and / or a receiver) and / or a network interface 2142. The transceiver 2138 is configured to transmit and receive signals of the communication device 2100 via an antenna 2140, such as the various signals described herein. The network interface 2142 is configured to transmit and receive signals of the communication device 2100 via a communication link (such as the various signals described herein). Figure 2The processing system 2102 may be configured to obtain and transmit signals for the communication device 2100 using the backhaul link, midhaul link, and / or fronthaul link described herein. The processing system 2102 may be configured to perform processing functions of the communication device 2100, including processing signals received and / or to be transmitted by the communication device 2100.

[0203] The processing system 2102 includes one or more processors 2104. In various aspects, such as for Figure 3 As described, the one or more processors 2104 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 2104 are coupled to the computer-readable medium / memory 2120 via the bus 2136. In some aspects, the computer-readable medium / memory 2120 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 2104, cause the one or more processors 2104 to perform operations for the Fig.17 The method 1700 described herein or any aspect thereof; Fig.18 The method 1800 described herein or any aspect thereof; Fig.19 The method 1900 described herein or any aspect thereof; and Fig. 20 The described method 2000 or any aspect related thereto. Note that references to a processor of the communication device 2100 that performs a function may include one or more processors 2104 of the communication device 2100 that perform the function.

[0204] In the depicted example, the computer-readable medium / memory 2120 stores code (e.g., executable instructions), such as code for receiving 2122, code for sending 2124, code for subscribing 2126, code for taking action 2128, code for configuring 2130, code for deciding 2132, and code for forwarding 2134. The processing of the code for receiving 2122, code for sending 2124, code for subscribing 2126, code for taking action 2128, code for configuring 2130, code for deciding 2132, and code for forwarding 2134 may cause the communication device 2100 to perform the Fig.17 The method 1700 described herein or any aspect thereof; Fig.18 The method 1800 described herein or any aspect thereof; Fig.19 The method 1900 described herein or any aspect thereof; and Fig. 20 The described method 2000 or any aspect related thereto.

[0205] The one or more processors 2104 include circuits configured to implement (e.g., execute) code stored in the computer-readable medium / memory 2120, including circuits such as circuits for receiving 2106, circuits for sending 2108, circuits for subscribing 2110, circuits for taking actions 2112, circuits for configuring 2114, circuits for deciding 2116, and circuits for forwarding 2118. Processing by the circuits for receiving 2106, the circuits for sending 2108, the circuits for subscribing 2110, the circuits for taking actions 2112, the circuits for configuring 2114, the circuits for deciding 2116, and the circuits for forwarding 2118 may cause the communication device 2100 to perform operations for the communication device 2100. Fig.17 The method 1700 described herein or any aspect thereof; Fig.18 The method 1800 described herein or any aspect thereof; Fig.19 The method 1900 described herein or any aspect thereof; and Fig. 20 The described method 2000 or any aspect related thereto.

[0206] The various components of the communication device 2100 may provide means for performing the following: Fig.17 The method 1700 described herein or any aspect thereof; Fig.18 The method 1800 described herein or any aspect thereof; Fig.19 The method 1900 described herein or any aspect thereof; and Fig. 20 The method 2000 described herein or any aspect related thereto. The means for sending, transmitting or outputting for sending may include Figure 3 The transceiver 332 and / or antenna 334 and / or Fig.21 The transceiver 2138 and antenna 2140 of the communication device 2100 in FIG. 1 may include Figure 3 The transceiver 332 and / or antenna 334 and / or Fig.21 The transceiver 2138 and antenna 2140 of the communication device 2100.

[0207] Sample Clauses

[0208] Specific implementation examples are described in the following numbered clauses:

[0209] Clause 1: A method for wireless communication at a first network entity, the method comprising: receiving a measurement report from a user equipment (UE) that supports dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, wherein the measurement report includes at least one of a PHY layer measurement or a MAC layer measurement; and sending the measurement report to a second network entity based on an event trigger.

[0210] Clause 2: The method of clause 1, wherein the measurement report is sent via: a no response message of an elementary procedure (EP); or an application protocol (AP) message.

[0211] Clause 3: A method as described in any of clauses 1 to 2, wherein the measurement report includes at least one timestamp associated with the PHY layer measurement or the MAC layer measurement.

[0212] Clause 4: A method as described in any of clauses 1 to 3, wherein the event trigger comprises receiving the measurement report from the UE.

[0213] Clause 5: A method as set forth in any one of clauses 1 to 4, wherein the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

[0214] Clause 6: A method as described in any of clauses 1 to 5, wherein: the first network entity comprises a first distributed unit (DU); and the second network entity comprises a centralized unit (CU).

[0215] Clause 7: The method of clause 6, wherein: the event trigger comprises receiving a request from the CU; and the measurement report is sent in response to the request.

[0216] Clause 8: The method of clause 6, further comprising subscribing to receive measurement reports having at least one of PHY layer measurements or MAC layer measurements from at least a second DU.

[0217] Clause 9: The method of clause 8, further comprising receiving from the CU a measurement report that the first DU has subscribed to receive from the at least second DU.

[0218] Clause 10: The method according to Clause 8 further includes: receiving from the CU a measurement report having at least one of a PHY layer measurement or a MAC layer measurement from at least a second DU; and making a primary serving cell (PCell) switching decision based on the measurement report from the at least second DU.

[0219] Clause 11: A method as set forth in clause 6, wherein the measurement report comprises at least one target DU identifier and at least one target cell identifier.

[0220] Clause 12: The method according to Clause 11 further includes: sending information about one or more cell group configurations of the first DU to the CU; and receiving signaling from the CU identifying the following items: at least a second DU associated with the target DU identifier, and one or more cells served by at least one second DU, the one or more cells including a cell associated with the target cell identifier.

[0221] Clause 16: The method of clause 11, wherein the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

[0222] Clause 13: A method for wireless communication at a second network entity, the method comprising: configuring a user equipment (UE) for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; and based on an event trigger, receiving a measurement report from a first network entity including at least one of a PHY layer measurement or a MAC layer measurement performed by the UE.

[0223] Clause 14: The method of clause 13, wherein the measurement report is received via: an elementary procedure (EP) no response message; or an application protocol (AP) message.

[0224] Clause 15: A method as set forth in any of clauses 13 to 14, wherein the measurement report comprises at least one timestamp associated with the PHY layer measurement or the MAC layer measurement.

[0225] Clause 17: A method as described in any of clauses 13 to 16, wherein: the first network entity comprises a first distributed unit (DU); and the second network entity comprises a centralized unit (CU).

[0226] Clause 18: The method of clause 17, wherein: the event trigger comprises receiving a request from the CU; and the measurement report is sent in response to the request.

[0227] Clause 19: The method of clause 17, wherein the event trigger comprises receipt, by the first DU, of the measurement report from the UE.

[0228] Clause 20: The method of clause 17, further comprising sending to the first DU measurement reports that the first DU has subscribed to receive from at least a second DU.

[0229] Clause 21: A method as set out in Clause 17, wherein the measurement report comprises at least one target DU identifier and at least one target cell identifier.

[0230] Clause 22: The method according to clause 17 further includes: receiving information about one or more cell group configurations from one or more DUs; determining a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling from the one or more cell group configurations; and sending signaling to at least the first DU identifying the following items: at least a second DU associated with the target DU identifier, and one or more cells served by at least one second DU, the one or more cells including a cell associated with the target cell identifier.

[0231] Clause 23: A method of wireless communication at a first network entity, the method comprising: sending information about one or more cell group configurations of the first network entity to a second network entity; and receiving signaling from the second network entity identifying at least a third network entity and one or more cells served by the at least third network entity.

[0232] Clause 24: The method of clause 23, wherein: the at least first network entity comprises a first distributed unit (DU); the second network entity comprises a centralized unit (CU); and the third network entity comprises a second DU.

[0233] Clause 25: According to the method described in any one of clauses 23 to 24, the method further includes: sending an indication of switching of a primary serving cell (PCell) of a user equipment (UE) to the second network entity, the switching being from a first cell served by the first network entity to a second cell served by the third network entity, or from the second cell served by the third network entity to the first cell served by the first network entity.

[0234] Clause 26: A method as described in clause 25, wherein the indication includes: an ID of the UE, an ID of the first network entity, an ID of the first cell, an ID of the third network entity, and an ID of the second cell.

[0235] Clause 27: A method for wireless communication at a second network entity, the method comprising: receiving information about one or more cell group configurations from at least a first network entity; determining a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling from the one or more cell group configurations; and sending signaling to the at least first network entity attached to the configured cell set to identify the at least first network entity and the cells served by the at least first network entity.

[0236] Clause 28: The method of clause 27, wherein: the at least first network entity comprises at least a first distributed unit (DU); and the second network entity comprises a centralized unit (CU).

[0237] Clause 29: The method according to Clause 28 further includes: receiving an indication of a primary serving cell (PCell) switch for a user equipment (UE), the switch being from a first cell served by the first DU to a second cell served by a second DU; and forwarding the indication of the PCell switch to the first DU or the second DU.

[0238] Clause 30: The method of clause 29, wherein: the indication of the PCell switch is received from the first DU; and the method further comprises sending the indication of the PCell switch to the second DU.

[0239] Clause 31: An apparatus, the apparatus comprising: a memory including executable instructions; and a processor configured to execute the executable instructions and cause the apparatus to perform the method according to any one of clauses 1 to 30.

[0240] Clause 32: An apparatus comprising means for performing the method of any of clauses 1 to 30.

[0241] Clause 33: 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 30.

[0242] Clause 34: 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 30.

[0243] Additional considerations

[0244] 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. Various examples may omit, replace or add various processes or components as appropriate. For example, the described methods may be performed in a different order from the described order, and various actions may be added, omitted or combined. In addition, the features described with respect to 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 other than the various aspects of the present disclosure set forth herein or different from 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 claims.

[0245] The various illustrative logic blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. Although a general purpose processor may be a microprocessor, 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.

[0246] 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 one processor may perform multiple operations and multiple processors may perform a single operation together. Similarly, "memory", "at least one memory" or "one or more memories" generally refers to a single memory configured to store data and / or instructions, multiple memories configured to store data and / or instructions together.

[0247] 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).

[0248] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include computing, calculating, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, and the like. Additionally, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Additionally, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0249] The method disclosed herein includes one or more actions for implementing the method. The method actions may be interchangeable with each other without departing from the scope of the claims. In other words, unless a specified 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 above-mentioned method may be performed by any suitable component capable of performing the corresponding function. These components may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors.

[0250] 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 explicitly stated, 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. An apparatus for wireless communication at a first network entity, the apparatus comprising: a memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: receiving a measurement report from a user equipment (UE) supporting dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling, wherein the measurement report comprises at least one of a PHY layer measurement or a MAC layer measurement; as well as Based on an event trigger, the measurement report is sent to the second network entity.

2. The apparatus according to claim 1, wherein the measurement report is sent via: No response message from the EP; or Application Protocol (AP) messages. 3 . The apparatus of claim 1 , wherein the measurement report comprises at least one timestamp associated with the PHY layer measurement or the MAC layer measurement. The apparatus of claim 1 , wherein the event triggering comprises receiving the measurement report from the UE. The apparatus of claim 1 , wherein the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

6. The apparatus according to claim 1, wherein: The first network entity comprises a first distributed unit (DU); and The second network entity includes a Centralized Unit (CU).

7. The device according to claim 6, wherein: The event triggering includes receiving a request from the CU; and The measurement report is sent in response to the request.

8. The apparatus of claim 6, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to subscribe to receive measurement reports having at least one of PHY layer measurements or MAC layer measurements from at least a second DU.

9. The apparatus of claim 8, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to receive, from the CU, measurement reports that the first DU has subscribed to receive from the at least second DU.

10. The apparatus of claim 8, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: receiving, from the CU, a measurement report having at least one of a PHY layer measurement or a MAC layer measurement from at least a second DU; and A primary serving cell (PCell) handover decision is made based on the measurement report from the at least second DU.

11. The apparatus of claim 6, wherein the measurement report comprises at least one target DU identifier and at least one target cell identifier.

12. The apparatus of claim 11 , wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: sending information about one or more cell group configurations of the first DU to the CU; and Receive signaling from the CU identifying: at least a second DU associated with the target DU identifier, and One or more cells served by at least one second DU, the one or more cells including a cell associated with the target cell identifier.

13. An apparatus for wireless communication at a second network entity, the apparatus comprising: a memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: Configuring a user equipment (UE) for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; as well as Based on an event trigger, a measurement report including at least one of a PHY layer measurement or a MAC layer measurement performed by the UE is received from a first network entity.

14. The apparatus of claim 13, wherein the measurement report is received via: No response message from the EP; or Application Protocol (AP) messages.

15. The apparatus of claim 13, wherein the measurement report comprises at least one timestamp associated with the PHY layer measurement or the MAC layer measurement.

16. The apparatus of claim 11, wherein the event trigger is based on at least one of: a configuration period or a radio quality value relative to a threshold.

17. The apparatus of claim 13, wherein: The first network entity comprises a first distributed unit (DU); and The second network entity includes a Centralized Unit (CU).

18. The apparatus according to claim 17, wherein: The event triggering includes receiving a request from the CU; and The measurement report is sent in response to the request.

19. The apparatus of claim 17, wherein the event triggering comprises receiving, by the first DU, the measurement report from the UE.

20. The apparatus of claim 17, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to send, to the first DU, measurement reports that the first DU has subscribed to receive from at least a second DU.

21. The apparatus of claim 17, wherein the measurement report comprises at least one target DU identifier and at least one target cell identifier.

22. The apparatus of claim 17, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: receiving information about one or more cell group configurations from one or more DUs; determining a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling from the one or more cell group configurations; and Sending signaling to at least the first DU identifying: at least a second DU associated with the target DU identifier, and One or more cells served by at least one second DU, the one or more cells including a cell associated with the target cell identifier.

23. An apparatus for wireless communication at a first network entity, the apparatus comprising: a memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: sending information about one or more cell group configurations of the first network entity to a second network entity; as well as Signaling is received from the second network entity identifying at least a third network entity and one or more cells served by the at least third network entity.

24. The apparatus of claim 23, wherein: The at least first network entity comprises a first distributed unit (DU); The second network entity comprises a Centralized Unit (CU); and The third network entity includes a second DU.

25. The apparatus of claim 23, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: and sending, to the second network entity, an indication of a primary serving cell (PCell) handover of a user equipment (UE), the handover being from a first cell served by the first network entity to a second cell served by the third network entity, or from the second cell served by the third network entity to the first cell served by the first network entity.

26. The apparatus of claim 25, wherein the indication comprises: The ID of the UE, the ID of the first network entity, the ID of the first cell, the ID of the third network entity, and the ID of the second cell.

27. An apparatus for wireless communication at a second network entity, the apparatus comprising: a memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: receiving information about one or more cell group configurations from at least a first network entity; determining, from the one or more cell group configurations, a first set of cells to be configured for dynamic mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; as well as Signaling is sent to the at least first network entity affiliated with the configured cell set to identify the at least first network entity and cells served by the at least first network entity.

28. The apparatus of claim 27, wherein: The at least first network entity comprises at least a first distributed unit (DU); and The second network entity includes a Centralized Unit (CU).

29. The apparatus of claim 28, wherein the one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to: receiving an indication of a primary serving cell (PCell) handover of a user equipment (UE) from a first cell served by the first DU to a second cell served by a second DU; and Forward the indication of the PCell switching to the first DU or the second DU.

30. The apparatus of claim 29, wherein: The indication of the PCell switching is received from the first DU; and The one or more processors are further configured to execute the computer-executable instructions and cause the apparatus to send an indication of the PCell switching to the second DU.

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