WO2024064399A1 - Gestion de fonctionnement de protocole de commande de liaison radio pour un changement rapide de cellule de desserte - Google Patents

Gestion de fonctionnement de protocole de commande de liaison radio pour un changement rapide de cellule de desserte Download PDF

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Publication number
WO2024064399A1
WO2024064399A1 PCT/US2023/033564 US2023033564W WO2024064399A1 WO 2024064399 A1 WO2024064399 A1 WO 2024064399A1 US 2023033564 W US2023033564 W US 2023033564W WO 2024064399 A1 WO2024064399 A1 WO 2024064399A1
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configuration
implementations
cell
message
rlc
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PCT/US2023/033564
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English (en)
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Chih-Hsiang Wu
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Google Llc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H04W12/037—Protecting confidentiality, e.g. by encryption of the control plane, e.g. signalling traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • This disclosure relates to wireless communications and, more particularly, to enabling a fast serving cell change for a user equipment (UE) using a control signaling of a protocol layer lower than a radio resource control (RRC) protocol layer.
  • RRC radio resource control
  • the Packet Data Convergence Protocol (PDCP) sublayer of the radio protocol stack provides services such as transfer of user-plane data, ciphering, integrity protection, etc.
  • the PDCP layer defined for the Evolved Universal Terrestrial Radio Access (EUTRA) radio interface (see 3GPP specification TS 36.323) and New Radio (NR) (see 3GPP specification TS 38.323) provides sequencing of protocol data units (PDUs) in the uplink direction (from a user device, also known as a user equipment (UE), to a base station) as well as in the downlink direction (from the base station to the UE).
  • EUTRA Evolved Universal Terrestrial Radio Access
  • NR New Radio
  • the PDCP sublayer provides signaling radio bearers (SRBs) and data radio bearers (DRBs) to the Radio Resource Control (RRC) sublayer.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • RRC Radio Resource Control
  • the UE and a base station use SRBs to exchange RRC messages as well as non-access stratum (NAS) messages.
  • NAS non-access stratum
  • the UE and base station use DRBs to transport data on a user plane.
  • PATENT APPLICATION Attorney Docket No.: 31730/304655-00 [0005]
  • UEs use several types of SRBs and DRBs.
  • the cells associated with the base station operating the master node (MN) define a master cell group (MCG), and the cells associated with the base station operating as the secondary node (SN) define the secondary cell group (SCG).
  • SRB1 resources carry RRC messages, which in some cases include NAS messages over the dedicated control channel (DCCH), and SRB2 resources support RRC messages that include logged measurement information or NAS messages, also over the DCCH but with lower priority than SRB1 resources. More generally, SRB1 and SRB2 resources allow the UE and the MN to exchange RRC messages related to the MN and embed RRC messages related to the SN and can be referred to as MCG SRBs.
  • SRB3 resources allow the UE and the SN to exchange RRC messages related to the SN and can be referred to as SCG SRBs.
  • Split SRBs allow the UE to exchange RRC messages directly with the MN via lower layer resources of the MN and the SN.
  • DRBs using the lower-layer resources of only the MN can be referred as MCG DRBs
  • DRBs using the lower-layer resources of only the SN can be referred as SCG DRBs
  • DRBs using the lower-layer resources of both the MCG and the SCG can be referred to as split DRBs.
  • the UE in some scenarios, concurrently utilizes resources of multiple radio access network (RAN) nodes (e.g., base stations or components of a distributed base station), interconnected by a backhaul.
  • RAN radio access network
  • RATs radio access technologies
  • this type of connectivity is referred to as Multi-Radio Dual Connectivity (MR-DC).
  • MN master node
  • SN secondary node
  • PSCell primary secondary cell
  • the UE communicates with the MN (via the PCell) and the SN (via the PSCell).
  • the UE utilizes resources of one base station at a time.
  • One base station and/or the UE determine that the UE should establish a radio connection with another base station. For example, one base station determines to hand the UE over to the second base station and initiates a handover procedure.
  • the RAN configures the UE to transmit Layer 3 (L3) measurement results.
  • L3 Layer 3
  • the RAN Based on L3 measurement results received from the UE, the RAN transmits an RRC reconfiguration message configuring Reconfiguration with Synchronization (e.g., the RRC reconfiguration message includes a ReconfigurationWithSync IE) for change of the serving cell (e.g., PCell or PATENT APPLICATION Attorney Docket No.: 31730/304655-00 PSCell).
  • the serving cell e.g., PCell or PATENT APPLICATION Attorney Docket No.: 31730/304655-00 PSCell.
  • CA carrier aggregation
  • SCell secondary cell
  • the serving cell change involves complete L2 (and L1) resets, leading to longer latency, larger overhead, and longer interruption time.
  • One example embodiment of these techniques is a method implemented in a user equipment (UE), the method comprising: communicating with a radio access network (RAN) according to a first configuration, including using an radio link control (RLC) entity; receiving, from the RAN, a second configuration for use subsequent to receiving an activation command; receiving the activation command from the RAN; and in response to the activation command: using the second configuration to communicate with the RAN, including determining whether to reestablish the RLC entity in accordance with an indication from the RAN.
  • RAN radio access network
  • RLC radio link control
  • Another example embodiment of these techniques is a method implemented in a radio access network (RAN) node, the method comprising: communicating with a user equipment (UE) in accordance with a first configuration; generating a second configuration, including refraining from including a reestablishment indication for a radio link control (RLC) bearer in the second configuration, when the second configuration is to be activated at the UE via a command from the RAN; and transmitting, to the UE, the second configuration.
  • RAN radio access network
  • One example embodiment of these techniques is a method, implemented in a RAN node, for managing radio link control operations during a cell change.
  • the method includes communicating, at the RAN node, with a UE in accordance with a first configuration; generating, at the RAN node, a second configuration by refraining from including a reestablishment indication for a radio link control entity in the second configuration when the second configuration is to be activated at a later time; and transmitting, from the RAN node, the second configuration without the reestablishment indication.
  • Another example embodiment of these techniques is a method for managing radio link control operations during a cell change, the method implemented in a RAN node.
  • the method includes communicating, at the RAN node, with a user equipment (UE) in accordance with a first configuration; and causing, at the RAN node, the UE to execute at PATENT APPLICATION Attorney Docket No.: 31730/304655-00 least one of the following based at least on a timing for a configuration activation of a second configuration for the cell change: performing a radio link control reestablishment operation, or refraining from performing the radio link control reestablishment operation.
  • Another example embodiment of these techniques is a method for managing radio link control operations during a cell change, the method implemented in a UE.
  • the method includes: communicating, at the UE, with a radio access network (RAN) node in accordance with a first configuration; receiving, at the UE and from the RAN node, a second configuration to be activated at a later time and excluding a reestablishment indication for a radio link control entity; and refraining, at the UE, from reestablishing the radio link control entity in response to receiving the second configuration.
  • RAN radio access network
  • Fig.1A is a block diagram of an example system in which a radio access network (RAN) and a user device can implement the techniques of this disclosure for managing conditional procedures related to a secondary node (SN);
  • Fig.1B is a block diagram of an example base station including a centralized unit (CU) and a distributed unit (DU) that can operate in the system of Fig.1A;
  • Fig.2 is a block diagram of an example protocol stack according to which the UE of Fig.1A communicates with base stations;
  • Fig.3 is a messaging diagram of an example scenario where a base station configures a UE to perform a lower layer procedure for a cell change operation;
  • Fig.4 is a messaging diagram of an example scenario where a base station configures a UE to perform a lower layer procedure for an inter-DU cell change operation;
  • Fig.5A is a messaging diagram of
  • Fig.1A depicts an example wireless communication system 100 in which communication devices can implement these techniques.
  • the wireless communication system 100 includes a UE 102, a base station (BS) 104, a base station 106 and a core network (CN) 110.
  • the UE 102 initially connects to the base station 104.
  • the base station 104 can perform an SN addition to configure the UE 102 to operate in dual connectivity (DC) with the base station 104 and the base station 106.
  • the base stations 104 and 106 operate as an MN and an SN for the UE 102, respectively.
  • the base station 104 can be implemented as a master eNB (MeNB) or a master gNB (MgNB), and the base station 106 can be implemented as a secondary gNB (SgNB).
  • the UE 102 can communicate with the base station 104 and the base station 106 via the same RAT such as EUTRA or NR, or different RATs.
  • the base station 104 is an MeNB and the base station 106 is a SgNB
  • the UE 102 can be in EUTRA-NR DC (EN-DC) with the MeNB and the SgNB.
  • an MeNB or an SeNB is implemented as an ng-eNB rather than an eNB.
  • the UE 102 can be in next generation (NG) EUTRA-NR DC (NGEN-DC) with the Mng-eNB and the SgNB.
  • NG next generation
  • NGEN-DC next generation
  • the base station 104 is an MgNB and the base station 106 is an SgNB
  • the UE 102 may be in NR-NR DC (NR-DC) with the MgNB and the SgNB.
  • NR-DC NR-NR DC
  • the base station 104 is an MgNB and the base station 106 is a Secondary ng-eNB (Sng-eNB)
  • the UE 102 may be in NR-EUTRA DC (NE-DC) with the MgNB and the Sng-eNB.
  • NE-DC NR-EUTRA DC
  • the base stations 104 and 106 operate as the source base station (S-BS) and a target base station (T-BS), respectively.
  • the UE 102 can operate in DC with the base station 104 and an additional base station (not shown in Fig.1A) for example prior to the handover.
  • the UE 102 can continue to operate in DC with the base station 106 and the additional base station or operate in single connectivity (SC) with the base station 106, after completing the handover.
  • the base stations 104 and 106 in this case operate as a source MN (S-MN) and a target MN (T-MN), respectively.
  • a core network (CN) 110 can be an evolved packet core (EPC) 111 or a fifth- generation core (5GC) 160, both of which are depicted in Fig.1A.
  • the base station 104 can be an eNB supporting an S1 interface for communicating with the EPC 111, an ng-eNB PATENT APPLICATION Attorney Docket No.: 31730/304655-00 supporting an NG interface for communicating with the 5GC 160, or a gNB that supports an NR radio interface as well as an NG interface for communicating with the 5GC 160.
  • the base stations 104 and 106 can support an X2 or Xn interface.
  • the EPC 111 can include a Serving Gateway (SGW) 112, a Mobility Management Entity (MME) 114, and a Packet Data Network Gateway (PGW) 116.
  • SGW Serving Gateway
  • MME Mobility Management Entity
  • PGW Packet Data Network Gateway
  • the SGW 112 is generally configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc.
  • MME Mobility Management Entity
  • PGW Packet Data Network Gateway
  • the SGW 112 is generally configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc.
  • the MME 114 is configured to manage authentication, registration, paging, and other related functions.
  • the PGW 116 provides connectivity from the UE to one or more external packet data networks, e.g., an Internet network and/or an Internet Protocol (IP) Multimedia Subsystem (IMS) network.
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • the 5GC 160 includes a User Plane Function (UPF) 162 and an Access and Mobility Management (AMF) 164, and/or Session Management Function (SMF) 166.
  • the UPF 162 is generally configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc.
  • the AMF 164 is configured to manage authentication, registration, paging, and other related functions
  • the SMF 166 is configured to manage PDU sessions.
  • the base station 104 supports cell 124A
  • the base station 106 supports a cell 126.
  • the cells 124A and 126 can partially overlap, so that the UE 102 can communicate in DC with the base station 104 and the base station 106, where one of the base stations 104 and 106 is an MN and the other is an SN.
  • the base station 104 can support additional cell(s) such as cells 124B and 124C, and the base station 106 can support additional cell(s) (not shown in Fig.1A).
  • the cells 124A, 124B and 124C can partially overlap, so that the UE 102 can communicate in carrier aggregation (CA) with the base station 104.
  • CA carrier aggregation
  • the base station 104 can operate the cells 124A, 124B and 124C via one or more transmit and receive points (TRPs).
  • the wireless communication network 100 can include any suitable number of base stations supporting NR cells and/or EUTRA cells. More particularly, the EPC 111 or the 5GC 160 can be connected to any suitable number of base stations supporting NR cells and/or EUTRA cells.
  • the base station 104 is equipped with processing hardware 130 that can include one or more general-purpose processors (e.g., CPUs) and a non-transitory computer-readable memory storing instructions that the one or more general-purpose processors execute. Additionally or alternatively, the processing hardware 130 can include special-purpose processing units.
  • general-purpose processors e.g., CPUs
  • non-transitory computer-readable memory storing instructions that the one or more general-purpose processors execute.
  • the processing hardware 130 can include special-purpose processing units.
  • the processing hardware 130 can include a PHY controller 132 configured to transmit data and control signal on physical downlink (DL) channels and DL reference signals with one or more user devices (e.g., UE 102) via one or more cells (e.g., the cell(s) 124A, 124B and/or 124C) and/or one or more TRPs.
  • the PHY controller 132 is also configured to receive data and control signal on physical uplink (UL) channels and/or UL reference signals with the one or more user devices via one or more cells (e.g., the cell(s) 124A, 124B and/or 124C) and/or one or more TRPs.
  • DL physical downlink
  • UL physical uplink
  • the processing hardware 130 in an example implementation includes a MAC controller 134 configured to perform MAC functions with one or more user devices.
  • the MAC functions includes a random access (RA) procedure, managing UL timing advance for the one or more user devices, and/or communicating UL/DL MAC PDUs with the one or more user devices.
  • the processing hardware 130 can further include an RRC controller 136 to implement procedures and messaging at the RRC sublayer of the protocol communication stack.
  • the RRC controller 132 may be configured to support RRC messaging associated with handover procedures, and/or to support the necessary operations when the base station 104 operates as an MN relative to an SN or as an SN relative to an MN.
  • the base station 106 can include processing hardware 140 that is similar to processing hardware 130.
  • components 142, 144, and 146 can be similar to the components 132, 134, and 136, respectively.
  • the UE 102 is equipped with processing hardware 150 that can include one or more general-purpose processors such as CPUs and non-transitory computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and/or special-purpose processing units.
  • the PHY controller 152 is also configured to receive data and control signal on physical DL channels and/or DL reference signals with the base station 104 or 106 via one or more cells (e.g., the cell(s) 124A, 124B, 124C and/or 126) and/or one or more TRPs.
  • the PHY controller 152 is also configured to transmit data and control signal on physical UL channels and/or UL reference signals with PATENT APPLICATION Attorney Docket No.: 31730/304655-00 the base station 104 or 106 via one or more cells (e.g., the cell(s) 124A, 124B, 124C and/or 126) and/or one or more TRPs.
  • the processing hardware 150 in an example implementation includes a MAC controller 154 configured to perform MAC functions with base station 104 or 106.
  • the MAC functions includes a random access procedure, managing UL timing advance for the one or more user devices, and communicating UL/DL MAC PDUs with the base station 104 or 106.
  • the processing hardware 150 can further include an RRC controller 156 to implement procedures and messaging at the RRC sublayer of the protocol communication stack.
  • the UE 102 in DC can use a radio bearer (e.g., a DRB or an SRB) that at different times terminates at the MN 104 or the SN 106.
  • the UE 102 can apply one or more security keys when communicating on the radio bearer, in the uplink (UL) (from the UE 102 to a base station) and/or downlink (from a base station to the UE 102) direction.
  • Fig.1B depicts an example distributed implementation of a base station such as the base station 104 or 106.
  • the base station in this implementation can include a centralized unit (CU) 172 and one or more distributed units (DUs) 174.
  • the CU 172 is equipped with processing hardware that can include one or more general-purpose processors such as CPUs and non-transitory computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and/or special-purpose processing units.
  • the CU 172 is equipped with the processing hardware 130.
  • the CU 172 is equipped with the processing hardware 140.
  • the processing hardware 140 in an example implementation includes an SN RRC controller 142 configured to manage or control one or more RRC configurations and/or RRC procedures when the base station 106 operates as an SN.
  • the DU 174 is also equipped with processing hardware that can include one or more general-purpose processors such as CPUs and non-transitory computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and/or special-purpose processing units.
  • the processing hardware in an example implementation includes a medium access control (MAC) controller configured to manage or control one or more MAC operations or procedures (e.g., a random access procedure) and a radio link control (RLC) controller configured to manage or control one or more RLC operations or procedures when the base station 106 operates as an MN or an SN.
  • the process hardware may include further a physical layer controller configured to manage or control one or more physical layer operations or procedures.
  • Fig.2 illustrates in a simplified manner a radio protocol stack according to which the UE 102 can communicate with an eNB/ng-eNB or a gNB.
  • Each of the base stations 104 or 106 can be the eNB/ng-eNB or the gNB.
  • the physical layer (PHY) 202A of EUTRA provides transport channels to the EUTRA Medium Access Control (MAC) sublayer 204A, which in turn provides logical channels to the EUTRA Radio Link Control (RLC) sublayer 206A, and the EUTRA RLC sublayer in turn provides RLC channels to the EUTRA PDCP sublayer 208 and, in some cases, NR PDCP sublayer 210.
  • the PHY 202B of NR provides transport channels to the NR MAC sublayer 204B, which in turn provides logical channels to the NR RLC sublayer 206B, and the NR RLC sublayer 206B in turn provides RLC channels to the NR PDCP sublayer 210.
  • the UE 102 in some implementations supports both the EUTRA and the NR stack, to support handover between EUTRA and NR base stations and/or DC over EUTRA and NR interfaces. Further, as illustrated in Fig.2A, the UE 102 can support layering of NR PDCP 210 over EUTRA RLC 206A.
  • the EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 receive packets (e.g., from the Internet Protocol (IP) layer, layered directly or indirectly over the PDCP layer 208 or 210) that can be referred to as service data units (SDUs), and output packets (e.g., to the RLC layer 206A or 206B) that can be referred to as protocol data units (PDUs).
  • IP Internet Protocol
  • PDUs protocol data units
  • the EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 provide SRBs to exchange Radio Resource Control (RRC) messages, for example.
  • RRC Radio Resource Control
  • the EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 provide DRBs to support data exchange.
  • the network can provide the UE 102 with an MN-terminated bearer that uses EUTRA PDCP 208 or MN-terminated bearer that uses NR PDCP 210.
  • the network in various scenarios also can provide the UE 102 with an SN-terminated bearer, which use only NR PDCP 210.
  • the MN-terminated bearer can be an MCG bearer or a split bearer.
  • the SN-terminated bearer can be a SCG bearer or a split bearer.
  • the MN-terminated bearer can be an SRB (e.g., SRB1 or SRB2) or a DRB.
  • the SN-terminated bearer can an SRB (e.g., SRB) or a DRB.
  • events in Figs.3- 7B that are similar are labeled with similar reference numbers (e.g., event 316 is similar to event 416 of Figs 4A and 4B, event 516 of Fig.5A, event 517 of Fig.5B, event 616 of Fig. 6A, event 617 of Fig.6B, event 716 of Fig.7A, and event 717 of Fig.7B), with differences discussed below where appropriate. With the exception of the differences shown in the figures and discussed below, any of the alternative implementations discussed with respect to a particular event (e.g., for messaging and processing) may apply to events labeled with similar reference numbers in other figures.
  • the base station 104 includes a CU 172 and a DU 174, and the DU 174 operates the cell 124A.
  • the UE 102 initially communicates 302 with the base station 104 on cell 124A using a first configuration.
  • the UE 102 in carrier aggregation (CA) communicates with the DU 174 on the cell 124A and other cell(s) (e.g., cell 124D not shown in Fig.1A) using the first configuration.
  • the DU 174 operates the other cell(s).
  • the UE 102 communicates with the DU 174 on the cell 124A only.
  • the UE 102 communicates with the DU 174 on the cell 124A and/or other cell(s) via one or multiple TRPs.
  • the cell 124A is a PCell.
  • the other cell(s) include SCell(s) and/or additional cell(s) associated with the PCell or an SCell.
  • the cell 124A is an SCell, and one of the other cell(s) is a PCell.
  • the other cell(s) include SCell(s) and/or additional cell(s) associated with the PCell or an SCell.
  • the base station 104 can be the DU 174, the CU 172, or the DU 174 and CU 172.
  • the UE 102 transmits UL PDUs and/or UL control signals to the base station 104 on the cell 124A and/or other cell(s) via one or multiple TRPs.
  • the UE 102 communicates UL PDUs and/or DL PDUs with the base station 104 via radio bearers, which include SRBs and/or DRB(s).
  • the base station 104 configures the radio bearers for the UE 102.
  • UL control signals include UL control information, channel state information, hybrid automatic repeat request (HARQ) acknowledgements (ACKs), HARQ negative ACKs, scheduling request(s), and/or sounding reference signal(s).
  • HARQ hybrid automatic repeat request
  • ACKs hybrid automatic repeat request acknowledgements
  • HARQ negative ACKs scheduling request(s)
  • the UE 102 receives DL PDUs and/or DL control signals from the PATENT APPLICATION Attorney Docket No.: 31730/304655-00 base station 104 on the cell 124A and/or other cell(s) via one or multiple TRPs.
  • the DL control signals include downlink control information (DCIs) and reference signals (e.g., synchronization signal block), channel state information reference signal(s) (CSI-RS(s)), and/or tracking reference signal(s)).
  • the base station 104 transmits the DCIs on physical downlink control channel(s) (PDCCH(s)) monitored by the UE 102 on the cell 124A and/or other cell(s) via one or multiple TRPs.
  • the first configuration includes physical layer configuration parameters, MAC configuration parameters, RLC configuration parameters, PDCP configuration parameters, measurement configuration parameters, and/or radio bearer configuration parameters.
  • the first configuration includes a CellGroupConfig IE (e.g., defined in 3GPP specification 38.331) or configuration parameters in the CellGroupConfig IE.
  • the first configuration includes a CSI- MeasConfig IE, a MeasConfig IE and/or a RadioBearerConfig IE (e.g., defined in 3GPP specification 38.331) or includes configuration parameters in the CSI-MeasConfig IE, MeasConfig IE and/or RadioBearerConfig IE.
  • the UE 102 receives the configuration parameters from the base station 104. In other implementations, the UE 102 receives a portion of the configuration parameters from a base station other than the base station 104 and the remaining portion of the configuration parameters from the base station 104.
  • the UE 102 While communicating with the base station 104, the UE 102 transmits 304 at least one measurement report to the DU 174.
  • the at least one measurement report includes Layer 1 (L1) measurement report(s) and/or Layer 3 (L3) measurement report(s) for at least one serving cell of the UE 102 and/or at least one non- serving cell.
  • the DU 174 transmits 306 a DU-to- CU message, including the L3 measurement report, to the CU 172.
  • the DU-to-CU message(s) of the event 306 are F1 application protocol (F1AP) message(s) (e.g., UL RRC Message Transfer message(s)).
  • F1AP F1 application protocol
  • the UE 102 does not transmit or refrains from transmitting the L1 measurement report(s) to the CU 172.
  • the at least one serving cell includes the cell 124A and/or other cell(s), and the at least one non- serving cell includes the cell 124B and/or cell 124C.
  • the first configuration includes at least one measurement configuration.
  • the UE 102 receives one or more RRC messages (e.g., RRCReconfiguration message(s)), including the at least one measurement configuration, from the CU 172 via the DU 174 in the PATENT APPLICATION Attorney Docket No.: 31730/304655-00 event 302.
  • the UE 102 performs measurements and transmits 304 the at least one measurement report to the DU 174.
  • the at least one measurement configuration includes L3 measurement configuration(s) (e.g., MeasConfig IE(s)) and/or L1 measurement configuration(s).
  • the L1 measurement configuration(s) e.g., CSI-MeasConfig IE(s)
  • the L1 measurement configuration(s) include CSI resource configuration(s) (e.g., CSI-ResourceConfig IE(s)) and/or CSI reporting configuration(s) (e.g., CSI-ReportConfig IE(s)).
  • the UE 102 transmits the L3 measurement report(s) to the CU 172 via the DU 174 in accordance with the L3 measurement configuration(s).
  • the UE 102 transmits the L1 measurement report(s) to the DU 174 in accordance with the L1 measurement configuration(s).
  • the at least one measurement configuration includes new-type measurement configuration(s) (e.g., new RRC IE(s) (e.g., as defined in 3GPP specification 38.331 v18.0.0 and/or later version)) for the fast serving cell change.
  • the new-type measurement configuration(s) include CSI resource configuration(s) (e.g., CSI-ResourceConfig IE(s)) and/or new-type reporting configuration(s).
  • the at least one measurement report includes new-type measurement report(s) associated with the new-type measurement configuration(s).
  • the UE 102 transmits the new-type measurement report(s) to the DU 174 in accordance with the new-type measurement configuration(s).
  • each of the new-type reporting configuration(s) includes a trigger event configuration configuring a trigger event to trigger the UE 102 to transmit a new-type measurement report. If the UE 102 detects the trigger event, the UE 102 transmits a new-type measurement report to the DU 174.
  • the L1 measurement report(s) include at least one L1 measurement result.
  • the at least one L1 measurement result includes at least one L1-reference signal received power (L1-RSRP) value and/or at least one L1-Signal to Interference Noise Ratio (L1-SINR) value.
  • L1-RSRP L1-reference signal received power
  • L1-SINR L1-Signal to Interference Noise Ratio
  • the UE 102 transmits a PUCCH transmission, including the L1 measurement report, to the DU 174, in some implementations. That is, the UE 102 transmits each of the L1 measurement report(s) on a PUCCH to the DU 174. In other implementations, for each of the L1 measurement report(s), the UE 102 transmits a PUSCH transmission, including the L1 measurement report, to the DU 174.
  • the UE 102 transmits each of the L1 measurement report(s) on a PUSCH to the DU 174.
  • the UE 102 transmits a portion of the L1 measurement report(s) on PUCCH(s) and the rest of the L1 PATENT APPLICATION Attorney Docket No.: 31730/304655-00 measurement report(s) on physical UL shared channel(s) (PUSCH(s)) to the DU 174.
  • each of the L1 measurement report(s) is a part of channel state information (CSI) (i.e., a CSI component) or CSI.
  • CSI channel state information
  • the UE 102 includes other CSI component(s) in the PUCCH transmission(s) and/or PUSCH transmission(s) described above.
  • the other CSI component(s) include components such as a channel quality indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a Synchronization Signal (SS)/Physical Broadcast Channel (PBCH) Resource Block Indicator (SSBRI), a Layer Indicator (LI), and/or a Rank Indicator (RI).
  • CQI channel quality indicator
  • PMI Precoding Matrix Indicator
  • CRI CSI-RS Resource Indicator
  • SS Synchronization Signal
  • PBCH Physical Broadcast Channel
  • SSBRI Resource Block Indicator
  • LI Layer Indicator
  • RI Rank Indicator
  • each of the L3 measurement report(s) includes at least one L3 measurement result.
  • the at least one L3 measurement result includes at least one RSRP (value) and/or at least one SINR (value).
  • each of the L3 measurement report(s) transmits each of the L3 measurement report(s) on a PUSCH to the CU 172 via the DU 174.
  • each of the L3 measurement report(s) is an RRC message (e.g., MeasurementReport message).
  • each of the L3 measurement configuration(s) includes a particular measurement identity (e.g., measId), and each of the L3 measurement report(s) includes a particular measurement identity in a particular L3 measurement configuration.
  • the CU 172 when the CU 172 receives an L3 measurement report including a measurement identity and an L3 measurement result from the UE 102 via the DU 174, the CU 172 determines that the L3 measurement report is associated with an L3 measurement configuration identified by the measurement identity. [0055] In some alternative implementations, for each of the at least one measurement report (e.g., L1 measurement report(s) and/or new-type measurement report(s)), the UE 102 transmits a MAC control element (CE) including the measurement report to the DU 174 in the event 304.
  • CE MAC control element
  • the UE 102 To transmit the MAC CE(s), the UE 102 generates one or more MAC PDUs, each including one or more of the MAC CE(s), for the DU 174 in the event 304.
  • the UE 102 performs measurements on one or more reference signals in accordance with the at least one measurement configuration.
  • the one or more reference signals include one or more Synchronization Signal (SS)/Physical Broadcast Channel (PBCH) Resource Blocks (SSBs) and/or one or more CSI-RSs.
  • SS Synchronization Signal
  • PBCH Physical Broadcast Channel
  • SSBs Resource Blocks
  • the UE 102 obtains the at least one L1 measurement result and/or at least one L3 measurement result from the measurements.
  • the DU 174 transmits the one or more reference signals on the cells 124A and 124B, and, in some implementations, the cell 124C and/or other cell(s).
  • the base station 104 i.e., the CU 172 or DU 174 determines to prepare the cell 124B for the UE 102.
  • the base station 104 determines to prepare the cell 124B for the UE 102 because the at least one measurement report indicates that the cell 124B could be used by the base station 104 to communicate with the UE 102.
  • the base station 104 determines to prepare the cell 124B for the UE 102 because the at least one measurement report indicates that the cell 124B qualifies to be used for communication with the UE 102. In some implementations, if the L3 measurement report(s) indicate that signal strength and/or quality of the cell 124B is above a first predetermined threshold and/or is better (e.g., higher) than the cell 124A, the CU 172 determines to prepare the cell 124B for the UE 102.
  • the DU 174 determines to prepare the cell 124B for the UE 102.
  • the base station 104 determines to prepare the cell 124B for the UE 102 regardless of whether a measure report is received from the UE 102 or not.
  • the CU 172 transmits 308 a first CU-to-DU message to the DU 174 to prepare the cell 124B for the UE 102.
  • the CU 172 includes a cell identity (ID) of the cell 124B in the first CU-to-DU message.
  • the cell ID is cell global identity (CGI).
  • the cell ID is a physical cell ID (PCI).
  • the DU 174 generates a second configuration (referred to herein as configuration 1) configuring the cell 124B and transmits 310 a first DU-to-CU message including the second configuration to the CU 172.
  • the DU 174 if the DU 174 determines to prepare the cell 124B, the DU 174 initiates transmission of the first DU-to-CU message to the CU 172.
  • PATENT APPLICATION Attorney Docket No.: 31730/304655-00 [0059]
  • the CU 172 After receiving the first DU-to-CU message, the CU 172 generates an RRC reconfiguration message (e.g., an RRCReconfiguration message), including the configuration 1, and transmits 316 a second CU-to-DU message including the RRC reconfiguration message to the DU 174.
  • the DU 174 transmits 318 the RRC reconfiguration message to the UE 102.
  • the UE 102 transmits 320 an RRC reconfiguration complete message (e.g., an RRCReconfigurationComplete message) to the DU 174, which in turn transmits 322 a second DU-to-CU message including the RRC reconfiguration complete message to the CU 172.
  • the CU 172 performs security protection (e.g., integrity protection and/or encryption) on the RRC reconfiguration message.
  • the CU 172 generates a message authentication code for integrity (MAC-I) for the RRC reconfiguration message, encrypts the RRC reconfiguration message and the MAC-I to obtain an encrypted RRC reconfiguration message and an encrypted MAC-I, and transmits a PDCP PDU including the encrypted RRC reconfiguration message and encrypted MAC-I to the UE 102 via the DU 174 in the events 316 and 318.
  • MAC-I message authentication code for integrity
  • the UE 102 When the UE 102 receives the PDCP PDU from the CU 172 via the DU 174 (i.e., events 316 and 318), the UE 102 decrypts the encrypted RRC reconfiguration and encrypted MAC-I to obtain the RRC reconfiguration message and MAC-I, and the UE 102 verifies whether the MAC-I is valid. If the UE 102 verifies the MAC-I is invalid, the UE 102 discards or ignores the RRC reconfiguration message. In some implementations, the UE 102 performs an RRC connection reestablishment procedure in response to the invalid MAC-I. Otherwise, in further implementations, if the UE 102 verifies the MAC-I is valid, the UE 102 processes the RRC reconfiguration.
  • the UE 102 refrains from applying (i.e., executing) the configuration 1 until receiving a configuration activation command activating the configuration 1 (e.g., event 330).
  • the first CU-to-DU message is a UE Context Modification Request message
  • the first DU-to-CU message is a UE Context Modification Response message or UE Context Modification Required message.
  • the CU 172 transmits a UE Context Modification Confirm message to the DU 174 in response to the UE Context Modification Required message.
  • the second CU-to-DU message is a DL RRC Message Transfer message.
  • the second CU-to-DU message is a UE Context Modification Request message
  • the DU 174 transmits a second DU-to-CU message (e.g., UE Context Modification Response message) to the CU 172 in response to the second CU-to-DU message.
  • PATENT APPLICATION Attorney Docket No.: 31730/304655-00
  • the events 308 and 310 are collectively referred to in Fig.3 as a serving cell preparation procedure 390.
  • the CU 172 includes a field or an IE in the RRC reconfiguration message of the events 316 and 318 to indicate to the UE 102 not to apply the configuration 1 immediately.
  • the field or IE is currently defined (e.g., in 3GPP specification 38.331 v18.0.0 and/or later versions). In further implementations, the field or IE is newly defined (e.g., in a 3GPP 6G specification). In some implementations, the field or IE is an indicator. If the RRC reconfiguration message of the event 318 includes the indicator, the UE 102 refrains from immediately applying the configuration 1. Otherwise, if the RRC reconfiguration message of the event 318 does not include the indicator, the UE 102 applies the configuration 1 immediately. In other implementations, the field or IE is a container (e.g., the first container and/or second container described below).
  • the UE 102 receives an RRC reconfiguration message (e.g., the RRC reconfiguration message of the event 318) including a configuration (e.g., configuration 1). If the configuration is included in the container, the UE 102 refrains from immediately applying the configuration. Otherwise, if the configuration is not included in the container, the UE 102 applies the configuration immediately. [0063] In some implementations, after receiving the configuration 1 in the event 310, the CU 172 generates a first container including the configuration 1, includes the first container in the RRC reconfiguration message, and transmits the RRC reconfiguration message to the UE 102 in the event 316. Alternatively, the DU 174 generates the first container and includes the first container in the first DU-to-CU message.
  • the first container is a first addition or modification list (e.g., ConfigToAddModList IE, CellConfigToAddModList IE, MobilityToAddModList IE, MobilityConfigToAddModList IE, or CellGroupConfigToAddModList IE).
  • the base station 104 includes the configuration 1 in a first element (referred to herein as element 1) of the first addition or modification list.
  • the element 1 is an addition or modification IE (e.g., ConfigToAddMod IE, CellConfigToAddMod IE, MobilityToAddMod IE, MobilityConfigToAddMod IE, or CellGroupConfigToAddMod IE).
  • the CU 172 when the UE 102 receives the first addition or modification list, the UE 102 stores the first addition or modification list (e.g., in a variable in a random access memory (RAM)).
  • PATENT APPLICATION Attorney Docket No.: 31730/304655-00 the CU 172 includes, in the RRC reconfiguration message, a first ID (referred to herein as ID 1) for identifying the configuration 1.
  • the CU 172 includes the ID 1 in the first container or element 1.
  • the CU 172 assigns the ID 1 for the configuration 1.
  • the CU 172 receives the ID 1 from the DU 174 in the first DU-to-CU message, as described below.
  • the CU 172 transmits the ID 1 to the DU 174, so that the DU 174 associates the ID 1 with the configuration 1.
  • the CU 172 includes the ID 1 in the first CU-to-DU message.
  • the CU 172 transmits 312 a third CU-to-DU message including the ID 1 to the DU 174.
  • the CU 172 includes the configuration 1 in the third CU-to-DU message to indicate the association between the ID 1 and configuration 1.
  • the DU 174 transmits 314 a third DU-to-CU message to the CU 172 in response to the third CU-to-DU message.
  • the DU 174 includes the ID 1 in the configuration 1. In such cases, the CU 172 does not include the ID 1 in the RRC reconfiguration message, first container and/or element 1.
  • the DU 174 assigns the ID 1 for identifying the configuration 1.
  • the DU 174 includes the ID 1 in the first DU- to-CU message.
  • the CU 172 includes the ID 1 in the RRC reconfiguration message.
  • the DU 174 includes the ID 1 in the configuration 1.
  • the CU 172 does not include an ID identifying the configuration 1 in the RRC reconfiguration message, first container, and/or element 1.
  • the configuration 1 includes a plurality of configurations for the UE 102 to communicate with the DU 174 on the cell 124B.
  • the plurality of configurations includes physical layer configuration parameters (e.g., PhysicalCellGroupConfig IE), MAC layer configuration parameters (e.g., MAC- CellGroupConfig IE), and/or RLC configuration parameters (e.g., RLC-BearerConfig IE(s)).
  • the plurality of configurations includes a special cell PATENT APPLICATION Attorney Docket No.: 31730/304655-00 configuration (e.g., SpCellConfig IE) and/or one or more SCell configurations (e.g., SCellConfig IE(s)).
  • the DU 174 includes a random access configuration in the configuration 1. In other implementations, the DU 174 does not include a random access configuration in the configuration 1. In some implementations, if the cell 124A and cell 124B are not synchronized, the DU 174 determines to include the random access configuration in the configuration 1.
  • the DU 174 determines to not include the random access configuration in the configuration 1. In other implementations, if the DU 174 determines that the UE 102 has not synchronized in UL with the cell 124B, the DU 174 determines to include the random access configuration in the configuration 1. Otherwise, if the DU 174 determines that the UE 102 has synchronized in UL with the cell 124B, the DU 174 determines to not include the random access configuration in the configuration 1. If the configuration 1 includes the random access configuration, the UE 102 performs the random access procedure in the event 332 in accordance with the random access configuration, as described below.
  • the DU 174 includes a random access configuration in the configuration 1 regardless of whether the cells 124A and 124B are synchronized or not. In some implementations, if the cell 124A and cell 124B are synchronized, the DU 174 determines to include, in the configuration 1, a first indication configuring the UE 102 not to perform a random access procedure on the cell 124B. Otherwise, if the cell 124A and cell 124B are not synchronized, the DU 174 determines to not include the first indication in the configuration 1.
  • the DU 174 determines to include the first indication in the configuration 1. Otherwise, if the DU 174 determines that the UE 102 has not synchronized in UL with the cell 124B, the DU 174 determines to not include the first indication in the configuration 1. If the configuration 1 includes the first indication, the UE 102 skips the random access procedure of the event 332 in accordance with or in response to the first indication.
  • the UE 102 performs the random access procedure in accordance with the random access PATENT APPLICATION Attorney Docket No.: 31730/304655-00 procedure in the event 332, in response to the configuration 1 excluding the first indication, as described below.
  • the DU 174 includes a reconfiguration with sync configuration (e.g., ReconfigurationWithSync IE) in the configuration 1 or special cell configuration.
  • the DU 174 does not include a reconfiguration with sync configuration (e.g., ReconfigurationWithSync IE) in the configuration 1 or special cell configuration.
  • the base station 104 determines to include the reconfiguration with sync configuration in the configuration 1. Otherwise, if the cell 124A and cell 124B are synchronized, the DU 174 determines to not include the reconfiguration with sync configuration in the configuration 1. In other implementations, if the DU 174 determines that the UE 102 has not synchronized in UL with the cell 124B, the DU 174 determines to include the reconfiguration with sync configuration in the configuration 1. Otherwise, if the DU 174 determines that the UE 102 has synchronized in UL with the cell 124B, the DU 174 determines to not include the reconfiguration with sync configuration in the configuration 1.
  • the UE 102 if the configuration 1 includes the reconfiguration with sync configuration, the UE 102 performs the random access procedure in the event 332, as described below, in response to or in accordance with the reconfiguration with sync configuration. Otherwise, if the configuration 1 does not include the reconfiguration with sync configuration, the UE 102 skips the random access procedure of the event 332.
  • the DU 174 includes a cell ID (i.e., cell ID 1) of cell 1 (i.e., the cell 124B) in the configuration 1.
  • the cell ID 1 is a PCI.
  • the cell ID 1 is a CGI.
  • the configuration 1 includes a cell index 1 (e.g., a serving cell index) indexing the cell ID 1 or the cell 124B.
  • the base station 104 i.e., the CU 172 or DU 174 determines to prepare other cell(s) of the base station 104 for the UE 102.
  • the base station 104 determines to prepare the other cell(s) because the at least one measurement report indicates that the other cell(s) could be used by the base station 104 to communicate with the UE 102.
  • the other cell(s) include the cell 124C and/or cells other than the cells 124A, 124B, and 124C.
  • the L3 measurement report(s) indicate that signal strength and/or quality of a particular cell of the other cell(s) is above a respective predetermined threshold and/or is better (e.g., higher) PATENT APPLICATION Attorney Docket No.: 31730/304655-00 than the cell 124A, the CU 172 determines to prepare the particular cell for the UE 102.
  • the DU 174 determines to prepare the particular cell for the UE 102.
  • the respective predetermined threshold(s) for the other cells are different from the first predetermined threshold.
  • the respective predetermined threshold(s) for the other cell(s) are the same as the first predetermined threshold.
  • the respective predetermined thresholds for the other cells are the same or different.
  • the base station 104 determines to prepare the other cell(s) for the UE 102 regardless of whether a measure report is received from the UE 102 or not.
  • the CU 172 and DU 174 perform at least one other serving cell preparation procedure to prepare the other cell(s), where each of the at least one other serving cell preparation procedure is similar to the procedure 390.
  • the CU 172 includes cell ID(s) of the other cell(s) in at least one CU-to-DU message of the at least one serving cell preparation procedure, similar to the first CU-to-DU message.
  • the CU 172 and DU 174 perform an additional serving cell preparation procedure to prepare each of the other cell(s), similar to the procedure 390.
  • the CU 172 includes a cell ID of a particular cell of the other cell(s) in a CU-to-DU message of the serving cell preparation procedure, similar to the first CU-to-DU message.
  • the DU 174 generates configuration(s) 2, ..., N, each configuring a particular cell of the other cell(s), and transmits the configuration(s) 2, ..., N to the CU 172, as described for the configuration 1.
  • N is an integer and larger than one. For example, “N” is 2, 4, 6, 8, 10, 12, 14 or 16.
  • the CU 172 determines to prepare the other cell(s) in the procedure 390. In some such cases, the CU 172 includes a cell ID for each of the other cell(s) in the first CU-to-DU message, and the DU 174 includes the configuration(s) 2, ..., N in the first DU-to-CU message. In yet other implementations, the DU 174 determines to prepare the other cell(s) in the procedure 390 and includes the configuration(s) 2, ..., N in the first DU-to-CU message.
  • the CU 172 after receiving the configuration(s) 2, ..., N from the DU 174, the CU 172 includes the configuration(s) 2, ..., N in the first container. In some implementations, the CU 172 includes the configuration(s) 2, ..., N in element(s) 2, ..., N and includes the element(s) 2, ..., N in the first container. In some implementations, the CU 172 includes, in the RRC reconfiguration message, ID(s) 2, ..., N for identifying the configuration(s) 2, ..., N, respectively. In some implementations, the CU 172 includes the ID(s) 2, ..., N in the first container.
  • the CU 172 includes the ID(s) 2, ..., N and configuration(s) 2, ..., N in the element(s) 2, ..., N in the first addition or modification list. [0076] In some implementations, the CU 172 assigns the ID(s) 2, ..., N for the configuration(s) , ..., N. In other implementations, the CU 172 receives the ID(s) 2, ..., N from the DU 174 in the first DU-to-CU message of the procedure 390 or in DU-to-CU message(s) of the at least one other serving cell preparation procedure or additional serving cell preparation procedure(s).
  • the CU 172 performs an ID allocation procedure with the DU 174 for each of the configuration(s) 2, ..., N, similar to the procedure 392.
  • the DU 174 includes the ID(s) 2, ..., N in the configuration(s) 2, ..., N.
  • the CU 172 does not include the ID(s) 2, ..., N in the RRC reconfiguration message, first container, and/or element(s) 2, ..., N.
  • the DU 174 assigns the ID(s) 2, ..., N in the configuration(s) 2, ..., N.
  • the DU 174 includes the ID(s) 2, ..., N in the first DU-to-CU message of the procedure 390 or in DU-to-CU message(s) of the at least one other serving cell preparation procedure or additional serving cell preparation procedure(s).
  • the CU 172 includes the ID(s) 2, ..., M in the RRC reconfiguration message.
  • the DU 174 includes the ID(s) 2, ..., N in the configuration(s) 2, ..., N.
  • the CU 172 does not include an ID identifying each of configuration(s) 2, ..., N in the RRC reconfiguration message, first container and/or element 1.
  • the CU 172 generates a second container including the configuration(s) 2, ..., N or element(s) 2, ..., N instead of using the first container.
  • the DU 174 generates the second container and includes the second container in the first DU-to-CU message or a DU-to-CU message of the other serving cell preparation procedure.
  • the CU 172 transmits an additional RRC reconfiguration message, including the second container, to the UE 102 via the DU 174, similar to the events PATENT APPLICATION Attorney Docket No.: 31730/304655-00 316 and 318.
  • the UE 102 transmits an additional RRC reconfiguration complete message to the CU 172 via the DU 174, similar to the events 320 and 322.
  • the second container is a second addition or modification list (e.g., ConfigToAddModList IE, CellConfigToAddModList IE, MobilityToAddModList IE, MobilityConfigToAddModList IE, or CellGroupConfigToAddModList IE), and each of the element(s) 2, ..., N is an addition or modification IE (e.g., ConfigToAddMod IE, ReconfigToAddMod IE, CellConfigToAddMod IE, MobilityToAddMod IE, MobilityConfigToAddMod IE, or CellGroupConfigToAddMod IE).
  • the UE 102 when the UE 102 receives the second addition or modification list, the UE 102 stores the second addition or modification list together with the first addition or modification list (e.g., in a variable in the RAM).
  • the DU 174 includes cell ID(s) 2, ..., N in the configuration(s) 2, ..., N, respectively.
  • the cell ID(s) 2, ..., N identify cell(s) 2, ..., N, respectively.
  • each of the cell ID(s) 2, ..., N is a PCI.
  • the configuration(s) 2, ..., N include cell index(es) 2 , ..., N (e.g., service cell index(es)) indexing the cell ID(s) 2, ..., N or the cell(s) 2, ..., N, respectively.
  • each of the configuration(s) 1 and/or 2, ..., N is a CellGroupConfig IE.
  • the following are example structures of the first or second addition or modification list (e.g., CellGroupConfigToAddModList IE), and CellGroupConfigToAddMod IE is an element of the first or second addition or modification list.
  • the CU 172 transmits, to the UE 102, a release list to release one or more configurations of the configuration(s) 1, ..., N via the DU 174.
  • the CU 172 transmits an RRC reconfiguration message including the release list to the UE 102 via the DU 174.
  • the UE 102 transmits an RRC reconfiguration complete message to the CU 172 via the DU 174.
  • the base station 104 includes ID(s) of the one or more configurations in the release list to indicate the one or more of the configurations to be released.
  • the UE 102 identifies the one or more of the configurations in accordance with the ID(s) and releases the one or more of the configurations in response to the release list.
  • the base station 104 transmits, to the UE 102, a third addition or modification list, which is empty or does not include a configuration, to release all PATENT APPLICATION Attorney Docket No.: 31730/304655-00 of the configuration(s) 1, ..., N.
  • the base station 104 transmits an RRC reconfiguration message, including the third addition or modification list, to the UE 102.
  • the UE 102 transmits an RRC reconfiguration complete message to the CU 172 via the DU 174.
  • the UE 102 releases all of the configuration(s) 1, ..., N in response to the third addition or modification list.
  • the CU 172 determines to release one configuration, more configurations, or all of the configuration(s) 1, ..., N, and transmits a CU-to-DU message to the DU 174 to indicate to the DU 174 to release the one, more, or all of the configuration(s) 1, ..., N.
  • the CU 172 includes one, more, or all of the ID(s) 1, ..., N in the CU-to-DU message to indicate to the DU 174 to release the one, more, or all of the configuration(s) 1, ..., N.
  • each of the cell ID(s) 1, ..., N is a CGI or PCI.
  • the DU 174 releases the one, more, or all of configuration(s) 1, ..., N and transmits a DU-to-CU message to the CU 172.
  • the DU 174 determines to release one, more, or all of the configuration(s) 1, ..., N and transmits a DU-to-CU message including ID(s) of the one, more, or all of the configuration(s) 1, ..., N to the CU 172.
  • the CU 172 After (e.g., in response to) receiving the DU-to-CU message, the CU 172 generates the release list or the third addition or modification list to release the one, more, or all of the configuration(s) 1, ..., N. [0085] In yet other implementations, the DU 174 generates the release list or the third addition or modification list. In some such cases, the DU 174 transmits a DU-to-CU message, including the release list or the third addition or modification list, to the CU 172. In some implementations, the CU 172 transmits a CU-to-DU message to the DU 174 in response. In some implementations the DU 174 determines to release the one, more, or all of the configuration(s) 1, ..., N.
  • the DU 174 receives, from the CU 172, a CU-to-DU message including the ID(s) of the one, more, or all of the configuration(s) 1, ..., N to indicate to release the one, more, or all of the configuration(s) 1, ..., N.
  • the first addition or modification list is a first CellGroupConfigToAddModList IE
  • the second addition or modification list is a second CellGroupConfigToAddModList IE.
  • the element 1 is a CellGroupConfigToAddMod IE 1
  • the element(s) 2, ..., N is/are CellGroupConfigToAddMod IE(s) 2, ..., N, respectively.
  • the ID 1 and configuration 1 are a ConfigId and a CellGroupConfig IE in the CellGroupConfigToAddMod IE 1, respectively.
  • the ID(s) 2, ..., N and configuration(s) 2, ..., N are a ConfigId and a CellGroupConfig IE in the CellGroupConfigToAddMod IE(s) 2, ..., N, respectively.
  • the first CellGroupConfigToAddModList IE includes the CellGroupConfigToAddMod IE 1
  • the second CellGroupConfigToAddModList IE includes the CellGroupConfigToAddMod IE(s) 2, ..., N.
  • the first CellGroupConfigToAddModList IE includes the CellGroupConfigToAddMod IE(s) 1, ..., N.
  • the release list is a CellGroupConfigToReleaseList IE.
  • the base station 104 includes one or more ConfigID IEs in the CellGroupConfigToReleaseList IE to release one or more CellGroupConfigToAddMod IEs of the CellGroupConfigToAddMod IE(s) 1, ..., N.
  • the one or more CellGroupConfigToAddMod IEs are identified by the one or more ConfigID IEs.
  • Example Implementation 2 is similar to Example Implementation 1, except that the CellGroupConfigToAddMod IE does not include a ConfigId.
  • the ID(s) 1, ..., N are implicitly indicated by the order of the CellGroupConfigToAddMod IE(s) 1, ..., N in the first or second CellGroupConfigToAddModList.
  • the CellGroupConfigToAddMod IE 1 is the first IE in the first CellGroupConfigToAddModList IE, which implicitly indicates that the ID 1 has value X.
  • X can be zero or one.
  • the first CellGroupConfigToAddModList IE includes PATENT APPLICATION Attorney Docket No.: 31730/304655-00 the CellGroupConfigToAddMod IE(s) 1, ..., N in sequence, the ID(s) 1, ..., N have values X, X+1, ...., X+(N-1).
  • the base station 104 transmits the second CellGroupConfigToAddModList IE to the UE 102, the UE 102 and base station 104 replace the first CellGroupConfigToAddModList IE with the second CellGroupConfigToAddModList IE.
  • the second CellGroupConfigToAddModList IE includes the CellGroupConfigToAddMod IE(s) 2, ..., N in sequence, the ID(s) 2, ..., N are values X, X+1, ...., X+N-2. If the second CellGroupConfigToAddModList IE includes the CellGroupConfigToAddMod IE(s) 1, ..., N in sequence, the ID(s) 1, ..., N are values X, X+1, ...., X+N-1. In some alternative implementations, the ID(s) 1, ..., N are the cell ID(s) 1, ..., N.
  • the base station 104 transmits a CellGroupConfigToAddModList IE including zero CellGroupConfigToAddMod IE to release all of the CellGroupConfigToAddMod IE(s) 1, ..., N.
  • the “CellGroupConfigToAddModList”, “CellGroupConfigToAddMod”, “configId”, “ConfigId” “cellGroupConfig”, “CellGroupConfigToReleaseList”, and “maxNrofConfigCells” are exemplary only and should not be considered to restrict scope and application of the invention.
  • each of the configuration(s) 1 and/or 2, ..., N is an RRCReconfiguration message.
  • Example Implementations 3-6 are example structures of the first or second addition or modification list.
  • the first or second addition or modification list is a CondReconfigToAddModList-r16 IE (e.g., as defined in 3GPP specification 38.331 from Release 16), and a CondReconfigToAddMod IE is an element of the list.
  • CondReconfigToAddModList-r16 :: SEQUENCE (SIZE (1..
  • the first addition or modification list is a first CondReconfigToAddModList-r16 IE and a second CondReconfigToAddModList-r16 IE.
  • the element 1 is a CondReconfigToAddMod-r16 IE 1
  • the element(s) 2, ..., N are CondReconfigToAddMod- r16 IE(s) 2, ..., N, respectively.
  • the ID 1 and configuration 1 are a CondReconfigId and an RRCReconfiguration message in the CondReconfigToAddMod IE 1, respectively.
  • the ID(s) 2, ..., N and configuration(s) 2, ..., N are a CondReconfigId and an RRCReconfiguration message in the CondReconfigToAddMod IE(s) 2, ..., N, respectively.
  • the first CondReconfigToAddModList-r16 IE includes the CondReconfigToAddMod-r16 IE 1
  • the second CondReconfigToAddModList-r16 IE includes the CondReconfigToAddMod-r16 IE(s) 2, ..., N.
  • the first CondReconfigToAddModList-r16 IE includes the CondReconfigToAddMod-r16 IE(s) 1, ..., N.
  • the base station 104 includes a condition configuration (i.e., condExecutionCond-r16) in at least one of the CondReconfigToAddMod- r16 IE(s).
  • a conditional procedure e.g., conditional handover (CHO), conditional PSCell addition (CPA), or conditional PSCell change (CPC)
  • the UE 102 evaluates one or more conditions configured in the condExecutionCond-r16 field for the conditional procedure.
  • the UE 102 If the UE 102 detects that at least one or all of the one or more conditions in the condExecutionCond-r16 field in a particular CondReconfigToAddMod-r16 IE is met, the UE 102 immediately applies configurations in an RRCReconfiguration message in the CondReconfigToAddMod-r16 IE (e.g., as described in 3GPP specification 38.331). In some implementations, the base station 104 does not include a condition configuration (i.e., condExecutionCond-r16) in any one or some of the CondReconfigToAddMod-r16 .
  • a condition configuration i.e., condExecutionCond-r16
  • the UE 102 is not configured to perform or does not perform any evaluation (i.e., detection or determination) of a condition for a conditional procedure (e.g., conditional handover) for the CondReconfigToAddMod-r16 IE(s) not including a condition configuration (i.e., condExecutionCond-r16).
  • a condition for a conditional procedure e.g., conditional handover
  • the CondReconfigToAddMod-r16 IE(s) not including a condition configuration i.e., condExecutionCond-r16.
  • PATENT APPLICATION Attorney Docket No.: 31730/304655-00 [0094]
  • the release list is a CondReconfigToRemoveList-r16 IE.
  • the base station 104 includes one or more CondReconfigID IEs in the release one or more CondReconfigToAddMod-r16 IEs of the CondReconfigToAddMod-r16 IE(s) 1, ..., N.
  • the one or more CondReconfigToAddMod-r16 IEs are identified by the one or more CondReconfigID IEs.
  • Example Implementation 4 is similar to Example Implementation 3, except that, in some implementations, a new indicator (e.g., fastServingCellChange-r18 field) is optionally included in a CondReconfigToAddMod-r16 IE.
  • the new indicator indicates that the CondReconfigToAddMod-r16 IE (i.e., an RRCReconfiguration message or condRRCReconfig-r16 in the IE) is configured for fast serving cell change (i.e., see description for event 312). If the base station 104 does not include the new indicator in a CondReconfigToAddMod-r16 IE, the CondReconfigToAddMod-r16 IE is not configured for fast serving cell change.
  • CondReconfigToAddModList-r16 :: SEQUENCE (SIZE (1..
  • the first addition or modification list is a first ReconfigToAddModList IE and the second addition or modification list is a second ReconfigToAddModList IE.
  • the element 1 is a ReconfigToAddMod IE 1, and the element(s) 2, ..., N are ReconfigToAddMod IE(s) 2, ..., N, respectively.
  • the ID 1 and configuration 1 are a ConfigId and an RRCReconfiguration IE in the ReconfigToAddMod IE 1.
  • the ID(s) 2, ..., N and configuration(s) 2, ..., N are a ConfigId and an RRCReconfiguration IE in the ReconfigToAddMod IE(s) 2, ..., N, respectively.
  • the first ReconfigToAddModList IE includes the ReconfigToAddMod IE 1
  • the second ReconfigToAddModList IE includes the ReconfigToAddMod IE(s) 2, ..., N.
  • the first ReconfigToAddModList IE includes the ReconfigToAddMod IE 1, ..., N.
  • the release list is a ReconfigToReleaseList IE.
  • the base station 104 includes one or more ConfigID IEs in the ReconfigToReleaseList IE to release one or more ReconfigToAddMod IEs of the ReconfigToAddMod IE(s) 1, ..., N.
  • the one or more ReconfigToAddMod IEs are identified by the one or more ConfigID IEs.
  • Example Implementation 6 ReconfigToAddModList :: SEQUENCE (SIZE (0...
  • Example Implementation 6 is similar to Example Implementation 5, except that the ReconfigToAddMod IE does not include a ConfigId.
  • the ID(s) 1, ..., N are implicitly indicated by the order of the ReconfigToAddMod IE(s) 1, ..., N in the first or second ReconfigToAddModList.
  • the ReconfigToAddMod IE 1 is the first IE in the first ReconfigToAddModList IE, which implicitly indicates that the ID 1 has value X.
  • X can be zero or one.
  • the first ReconfigToAddModList IE includes the ReconfigToAddMod IE(s) 1, ..., N in sequence, the ID(s) 1, ..., N have values X, X+1, ...., X+(N-1).
  • the base station 104 transmits the second ReconfigToAddModList IE to the UE 102, the UE 102 and base station 104 replace the first ReconfigToAddModList IE with the second ReconfigToAddModList IE.
  • the second ReconfigToAddModList IE includes the ReconfigToAddMod IE(s) 2, ..., N in sequence, the ID(s) 2, ..., N are values X, X+1, ...., X+N-2. If the second ReconfigToAddModList IE includes the ReconfigToAddMod IE(s) 1, ..., N in sequence, the ID(s) 1, ..., N have values X, X+1, ...., X+N-1. In some alternative implementations, the ID(s) 1, ..., N are the cell ID(s) 1, ..., N.
  • the base station 104 transmits a ReconfigToAddModList IE including zero ReconfigToAddMod IE to release all of the ReconfigToAddMod IE(s) 1, ..., N.
  • the “ReconfigToAddModList”, “ReconfigToAddMod”, “configId”, “ConfigId”, “cellGroupConfig”, “ReconfigToReleaseList”, and “maxNrofConfigCells” are exemplary and should not restrict scope and application of the invention.
  • Example Implementation 7 Example Implementation 7 is a combination of the Example Implementations 1 and 5, as shown below.
  • any of the configuration(s) 1, ..., N is a CellGroupConfig IE or an RRCReconfiguration message. Examples and implementations described for the Example Implementations 1 and 5 can apply to Example Implementation 7.
  • ReconfigToAddModList :: SEQUENCE (SIZE (1..
  • the UE 102 After receiving the RRC reconfiguration message in the event 318 or transmitting the RRC reconfiguration complete message in the event 320, the UE 102 transmits 324 at least one measurement report to the DU 174, similar to the event 304. In some implementations, the DU 174 transmits 326 a DU-to-CU message, including the at least one measurement report, to the CU 172, similar to the event 306. In other implementations, the DU 174 does not transmit the at least one measurement report to the CU 172.
  • the at least one measurement report of the event 324 includes L1 measurement report(s), L3 measurement repot(s), and/or new-type measurement report(s), as described for the event 304.
  • the UE 102 transmits 324 the at least one measurement report on PUCCH(s) and/or PUSCH(s) to the DU 174, similar to the event 304.
  • the UE 102 transmits 324 at least one MAC CE, including the at least one measurement report, to the DU 174, similar to the event 304.
  • each of the at least one measurement report of the event 324 is not an RRC message.
  • the UE 102 transmits 324 the at least one measurement report to the DU 174 in accordance with at least one measurement configuration.
  • the at least one measurement configuration configures the UE 102 to perform measurements and report measurement results.
  • the CU 172 transmits the at least one measurement configuration to the UE 102 via the DU 174.
  • the CU 172 transmits one or more RRC messages (e.g., RRCReconfiguration message(s)), including the at least one measurement configuration, to the UE 102 via the DU 174 after the event 306 or 316.
  • the one or more RRC messages do or do not include the RRC reconfiguration message of the event 316.
  • the UE 102 performs measurements on one or more reference signals.
  • the one or more reference signals include one or more SSBs and/or one or more CSI-RSs.
  • the UE 102 obtains the at least one L1 measurement result and/or at least one L3 measurement result from the measurements and includes the at least one L1 PATENT APPLICATION Attorney Docket No.: 31730/304655-00 measurement result and/or at least one L3 measurement result in the measurement report of the event 324.
  • the DU 174 transmits the one or more reference signals on the cells 124A and 124B, and, in some implementations, the cell 124C and/or other cell(s).
  • the measurement configuration(s) include L3 measurement configuration(s) (e.g., MeasConfig IE(s)), L1 measurement configuration(s) (e.g., CSI-MeasConfig IE(s)), and/or new-type measurement configuration(s), as described for the event 304.
  • the new-type measurement configuration(s) as described for the events 304 and 324 are similar to the L3 measurement configuration(s).
  • the new-type measurement configuration includes a portion of configuration parameters defined in a MeasConfig IE.
  • the new-type measurement configuration(s) as described for the events 304 and 324 are similar to the L1 measurement configuration(s).
  • the new-type measurement configuration includes a portion of configuration parameters (e.g., CSI-ResourceConfig IE(s) and/or CSI-ReportConfig IE(s)) defined in a CSI-MeasConfig IE.
  • the DU 174 transmits 330 a first configuration activation command to the UE 102 to activate the configuration 1.
  • the base station 104 transmits the first configuration activation command on the cell 124A.
  • the base station 104 transmits the first configuration activation command on the cell 124D.
  • the DU 174 includes the ID 1 of in the first configuration activation command.
  • the UE 102 determines and activates the configuration 1, in accordance with the first configuration activation command and ID 1.
  • the DU 174 includes, in the first configuration activation command, the cell index 1 (e.g., a serving cell index) or cell ID 1 included in the configuration 1.
  • the UE 102 determines and activates the configuration 1, in accordance with the first configuration activation command and the cell index 1 or cell ID 1.
  • the DU 174 includes a bit map in the first configuration activation command to activate the configuration 1, instead of the ID 1, cell ID 1, or cell index 1. The number of bits in the bit map is larger than or equal to “N”.
  • bit 1, ..., N corresponds to the configuration(s) 1, ..., N, respectively, and the DU 174 sets a corresponding bit (e.g., bit 1) in the bit map to a first value to indicate the ID 1 or the configuration 1.
  • bit 0, ..., N-1 corresponds to the PATENT APPLICATION Attorney Docket No.: 31730/304655-00 configuration(s) 1, ..., N, respectively, and the DU 174 sets a corresponding bit (e.g., bit 0) in the bit map to a first value to indicate the ID 1 or the configuration 1.
  • the UE 102 can determine the particular ID or particular configuration in accordance with the bit 1 or bit 0 set to the first value in the bit map.
  • the DU 174 sets the remaining bits in the bit map to a second value to indicate that the reset of the configuration(s) 1, ..., N is not activated.
  • the first value is one and the second value is zero. In other implementations, the first value is zero and the second value is one.
  • the at least one measurement report (e.g., L1 measurement report(s) or new-type measurement report(s)) of the event 324 includes at least one measurement result for the cell 124B.
  • the DU 174 determines to activate the configuration 1 because the at least one measurement result indicates that signal strength or quality of the cell 124B is above a second predetermined threshold.
  • the second predetermined threshold is different from the first predetermined threshold.
  • the second predetermined threshold is larger than the first predetermined threshold.
  • the at least one measurement report of the event 324 indicates that signal strength or quality of the cell 124B is suitable for communication with the UE 102.
  • the second predetermined threshold is equal to the first predetermined threshold.
  • the at least one measurement report of the event 324 indicates that signal strength or quality of the cell 124B has been continuously above the second predetermined threshold or the first predetermined threshold. This also indicates that the cell 124B is suitable for communication with the UE 102.
  • the DU 174 determines to activate the configuration 1 (i.e., fast serving cell change to the cell 124B) in response to determining that signal strength or quality of the cell 124B is above the second predetermined threshold.
  • the at least one measurement report (e.g., L3 measurement report(s)) of the events 324 and 326 includes at least one measurement result for the cell 124B.
  • the CU 172 determines to activate the configuration 1 because the at least one measurement result indicates that signal strength or quality of the cell 124B is above a second predetermined threshold.
  • the second predetermined threshold is different from the first predetermined threshold.
  • the second predetermined threshold PATENT APPLICATION Attorney Docket No.: 31730/304655-00 is larger than the first predetermined threshold.
  • the at least one measurement report of the event 326 indicates that signal strength or quality of the cell 124B is suitable for communication with the UE 102.
  • the second predetermined threshold is equal to the first predetermined threshold.
  • the at least one measurement report of the event 326 indicates that signal strength or quality of the cell 124B has been continuously above the second predetermined threshold or the first predetermined threshold. This also indicates that the cell 124B is suitable for communication with the UE 102.
  • the CU 172 determines to activate the configuration 1 (i.e., fast serving cell change to the cell 124B) in response to determining that signal strength or quality of the cell 124B is above the second predetermined threshold.
  • the CU 172 transmits 328 a fourth CU-to-DU message to the DU 174 to activate the configuration 1.
  • the DU 174 transmits 330 the first configuration activation command to the UE 102 and optionally transmits a fourth DU-to-CU message to the CU 172.
  • the CU 172 includes the cell index 1 (e.g., a serving cell index) in the fourth CU-to-DU message.
  • the DU 174 can determine to activate the configuration 1 in accordance with the (serving) cell index 1.
  • the CU 172 includes the cell ID 1 in the fourth CU-to-DU message.
  • the DU 174 can determine to activate the configuration 1 in accordance with the cell ID.
  • the CU 172 includes the ID 1 in the fourth CU-to-DU message.
  • the DU 174 can determine to activate the configuration 1 in accordance with the ID 1.
  • the fourth CU-to-DU message and fourth DU-to-CU message are a UE Context Modification Request message and a UE Context Modification Response message, respectively.
  • the fourth CU-to-DU message is a new interface message (e.g., an F1 application protocol (F1AP) message (e.g., defined in 3GPP specification 38.473 v18.0.0 and/or later versions)).
  • F1AP F1 application protocol
  • the fourth DU-to-CU message is a new interface message (e.g., a new F1AP message (e.g., defined in 3GPP specification 38.473 v18.0.0 and/or later versions)).
  • the first configuration activation command is a MAC CE included in a MAC PDU that the UE 102 receives from the DU 174 in the event 330.
  • the MAC CE is a new MAC CE (e.g., defined in 3GPP specification 38.321 v18.0.0 and/or later versions).
  • the DU 174 includes a subheader identifying the MAC CE in the MAC PDU, and the UE 102 identifies the MAC PATENT APPLICATION Attorney Docket No.: 31730/304655-00 CE in the MAC PDU in accordance with the subheader.
  • the subheader includes a logical channel ID or extended logical channel ID (e.g., defined in a 3GPP specification) to identify the MAC CE.
  • the logical channel ID or extended logical channel ID are newly defined (e.g., in 3GPP specification 38.321 v18.0.0 and/or later versions).
  • the first configuration activation command is a DCI that the UE 102 receives on a PDCCH in the event 330.
  • the DU 174 generates a CRC for the DCI, scrambles the CRC with a first C-RNTI of the UE 102, and transmits the DCI and scrambled CRC on the PDCCH in the event 330.
  • a format of the DCI is an existing DCI format (e.g., defined in a 3GPP specification (e.g., 38.212)).
  • the format of the DCI is a new DCI format (e.g., defined in a 3GPP specification (e.g., 38.212 v18.0.0 or later versions)).
  • the DU 174 does not perform security protection (e.g., integrity protection and/or encryption) on the first configuration activation command. This speeds up processing the first configuration activation command in the UE 102 because the UE 102 does not spend time to perform a security check (e.g., decryption and/or integrity check) on the first configuration activation command.
  • the UE 102 transmits 331 an acknowledgement to the DU 174 on the cell 124A or cell 124D to indicate that the UE 102 receives the first configuration activation command.
  • the acknowledgement is a HARQ ACK.
  • the acknowledgement is a MAC CE.
  • the MAC CE is an existing MAC CE (e.g., defined in 3GPP specification 38.321 v17.1.0).
  • the MAC CE is a new MAC CE (e.g., defined in 3GPP specification 38.321 v18.0.0 and/or later versions).
  • the acknowledgement is a PUCCH transmission.
  • the CU 172 transmits 316 the RRC reconfiguration message in response to the L3 measurement report for the cell 124B that the CU 172 receives in the event 306.
  • the CU 172 transmits a first RRC reconfiguration message, including a MeasConfig IE, to the UE 102 to configure the UE 102 to transmit the L3 measurement report.
  • the DU 174 transmits 330 the first configuration activation command in response to the L1 measurement report for the cell 124B that the DU 174 receives in the event 324.
  • the CU 172 transmits a second RRC reconfiguration message, including a CSI-MeasConfig IE, to the UE PATENT APPLICATION Attorney Docket No.: 31730/304655-00 102 to configure the UE 102 to transmit the L1 measurement report.
  • the first and second RRC reconfiguration messages are the same message (i.e., the same instance). In other implementations, the first and second RRC reconfiguration messages are different messages. In some implementations, the second RRC reconfiguration message is the RRC reconfiguration message of the event 316. In other implementations, the second RRC reconfiguration message is different from the RRC reconfiguration message of the event 316. [0114] After (e.g., in response to) receiving the first configuration activation command, the UE 102 identifies the particular configuration (e.g., the configuration 1) in accordance with the particular ID (e.g., the ID 1) and immediately applies the configuration 1.
  • the particular configuration e.g., the configuration 1
  • the particular ID e.g., the ID 1
  • the UE 102 performs 332 a random access procedure on the cell 124B with the DU 174 in response to applying the configuration 1.
  • the UE 102 disconnects from the cell 124A after (e.g., in response to) receiving the first configuration activation command or transmitting the acknowledgement.
  • the UE 102 stops communicating on the cell 124A (e.g., in response to) receiving 330 the first configuration activation command or transmitting 331 the acknowledgement.
  • the UE 102 performs 332 the random access procedure after disconnecting from the cell 124A.
  • the UE 102 determines whether to perform the random access procedure in accordance with the configuration 1.
  • the UE 102 if the configuration 1 configures the UE 102 to perform a random access procedure, the UE 102 performs the random access procedure in the event 332.
  • the configuration 1 includes a reconfiguration with sync configuration (e.g., ReconfigurationWithSync IE) to configure the UE 102 to perform a random access procedure. Otherwise, if the configuration 1 does not configure the UE 102 to perform a random access procedure or configures the UE 102 to skip a random access procedure, the UE 102 refrains from performing a random access procedure with the DU 174 upon receiving the first configuration activation command. In such cases, the UE 102 skips the event 316.
  • a reconfiguration with sync configuration e.g., ReconfigurationWithSync IE
  • the configuration 1 configures the UE 102 not to perform a random access procedure.
  • the random access procedure is a four-step random access procedure.
  • the random access procedure is a two-step random access procedure.
  • the random access procedure is a contention-free random access procedure.
  • the random access procedure is a contention-based random access procedure.
  • the UE 102 communicates 336 with the DU 174 on cell 124B using the configuration 1 and communicates with the CU 172 via the DU 174 after successfully completing the random access procedure.
  • the UE 102 communicates UL PDUs, DL PDUs, and/or physical layer signals (e.g., PUCCH transmissions and PDCCH transmissions) with the base station 104 in the event 318.
  • the UE 102 successfully completes the random access procedure when the UE 102 receives a contention resolution from the DU 174.
  • the UE 102 transmits a Message 3, including a UE identity, to the DU 174 via the cell 124B in the random access procedure.
  • the UE 102 transmits a Message A, including the UE identity, to the DU 174 via the cell 124B in the random access procedure.
  • the UE identity is the second C-RNTI of the UE 102. Otherwise, if the configuration 1 does not include a C-RNTI, the UE identity is the first C-RNTI.
  • the UE 102 transmits the dedicated random access preamble to the DU 174 via the cell 124B.
  • the configuration 1 includes the dedicated random access preamble.
  • the DU 174 identifies or determines that the UE 102 connects to the cell 124B upon receiving the UE identity or the dedicated preamble from the UE 102 in the random access procedure.
  • the UE 102 transmits an RRC message (e.g., RRC reconfiguration complete message) to the CU 172 via the DU 174 and the cell 124B to indicate that the UE 102 applies the configuration 1.
  • RRC message e.g., RRC reconfiguration complete message
  • the UE 102 includes the RRC message in the Message 3. In further implementations, the UE 102 includes the RRC message in the Message A. In yet further implementations, the UE 102 transmits the RRC message after completing the random access procedure. In other implementations, if the UE 102 maintains communication on the cell 124A with the base station 104 (i.e., the UE 102 does not disconnect from the cell 124A), the UE 102 transmits the RRC message to the base station 104 via the cell 124A. In yet other implementations, the UE 102 refrains from transmitting the RRC message to the base station 104 in response to applying the configuration 1 or receiving the first configuration activation command.
  • the UE 102 directly communicates 336 with the base station 104 on cell 124B in accordance with the configuration 1 after (e.g., in response to) receiving the first configuration activation command.
  • the UE 102 communicates UL PDUs, DL PDUs, and/or physical layer signals (e.g., PUCCH transmissions and PDCCH transmissions) with the base station 104 in the event 318.
  • the UE 102 transmits 336 at least one PUCCH transmission on the cell 124B to the DU 174 in accordance with the configuration 1, after (e.g., in response to) receiving the first configuration activation command.
  • the DU 174 transmits at least one DCI on a PDCCH on the cell 124B to the UE 102 to command the UE 102 to transmit the at least one PUCCH or PUSCH transmission after transmitting the first configuration activation command.
  • the DU 174 identifies or determines that the UE 102 connects to the cell 124B upon receiving the PUCCH or PUSCH transmission.
  • the UE 102 transmits the at least one PUCCH or PUSCH transmission regardless of receiving a DCI on a PDCCH on the cell 124B.
  • the DU 174 identifies or determines that the UE 102 connects to the cell 124B upon receiving the PUCCH or PUSCH transmission.
  • the UE 102 transmits an RRC message (e.g., RRC reconfiguration complete message) to the CU 172 via the DU 174 and the cell 124B to indicate that the UE 102 applies the configuration 1.
  • the CU 172 identifies or determines that the UE 102 connects to the cell 124B upon receiving the RRC message.
  • the UE 102 if the UE 102 maintains communication on the cell 124A with the base station 104 (i.e., the UE 102 does not disconnect from the cell 124A), the UE 102 transmits the RRC message to the base station 104 via the cell 124A. In yet other implementations, the UE 102 refrains from transmitting the RRC message to the base station 104 in response to applying the configuration 1 or receiving the first configuration activation command. [0119] In some implementations, when the DU 174 determines that the UE 102 successfully connects to the cell 124B in the event 332 or 336, the DU 174 transmits 334 a DU-to-CU message (e.g., Access Success message) to the CU 172.
  • a DU-to-CU message e.g., Access Success message
  • the DU 174 includes a cell ID of the cell 124B in the DU-to-CU message of the event 334.
  • the cell ID can be a PCI or a CGI.
  • the CU 172 determines that the UE 102 connects to the cell 124B upon receiving the DU-to-CU message of the event 334.
  • the DU 174 determines that the UE 102 successfully connect PATENT APPLICATION Attorney Docket No.: 31730/304655-00 to the cell 124B in the event 332 or 336
  • the DU 174 transmits a DL Data Delivery Status message or frame to the CU 172.
  • the DU 174 when determining that the UE 102 connects to the cell 124B, transmitting 330 the first configuration activation command, or receiving 331 the acknowledgement, the DU 174 stops communicating with the UE 102 on the cell 124A. In some implementations, when determining that the UE 102 connects to the cell 124B, transmitting 330 the first configuration activation command, or receiving 331 the acknowledgement, the DU 174 releases resources of cell 124A configured for the UE 102.
  • the events 304, 306, 390, 392, 316, 318, 320, 322, 324, 326, 328, 330, 331, 332, 334, 336, 394 are collectively referred to in Fig.3 as a fast serving cell configuration procedure 380.
  • the DU 174 generates the configuration 1 and/or configuration(s) 2, ..., N as full configuration(s) replacing the first configuration or a particular configuration in the first configuration.
  • the UE 102 and DU 174 communicate 336 with each other in accordance with the configuration 1 instead of the first configuration or particular configuration.
  • the DU 174 includes an indication that the configuration 1 is a full configuration in the configuration 1.
  • the RRC reconfiguration message of the events 316, 318 includes an indication that the configuration 1 is a full configuration.
  • the first container includes an indication that the configuration 1 is a full configuration.
  • the element 1 e.g., ConfigToAddMod IE, CellGroupConfigToAddMod, MobilityToAddMod IE, MobilityConfigToAddMod IE, or CellGroupConfigToAddMod IE
  • the UE 102 determines that configuration 1 is a full configuration based on the indication that the configuration 1 is a full configuration.
  • the indication that the configuration 1 is different from a fullConfig field (e.g., defined in the current 3GPP specifications). In other implementations, the indication that the configuration 1 is a fullConfig field in an RRCReconfiguration message (e.g., defined in the current 3GPP specifications).
  • the DU 174 generates the configuration 1 and/or configuration(s) 2, ..., N as delta configuration(s) augmenting at least a portion of the first PATENT APPLICATION Attorney Docket No.: 31730/304655-00 configuration. In other words, the DU 174 generates the configuration(s) 1, ..., N on top of the first configuration.
  • the UE 102 and DU 174 augment at least the portion of the first configuration with the configuration 1.
  • the UE 102 and base station 104 communicate 336 with each other in accordance with the configuration 1 and unaugmented portion of the first configuration.
  • the configuration 1 includes an indication that the configuration 1 is a delta configuration.
  • the first container includes an indication that the configuration 1 is a delta configuration.
  • the element 1 includes an indication that the configuration 1 is a delta configuration.
  • the UE 102 determines that configuration 1 is a full configuration based on the indication that the configuration 1 is a delta configuration.
  • the configuration 1, first container, or element 1 excludes an indication that the configuration 1 is a full configuration to indicate that the configuration 1 is a delta configuration.
  • the UE 102 determines that the configuration 1 is a delta configuration based on the exclusion of the indication in the configuration 1, first container, or element 1. [0124] In some implementations, if the configuration 1 is a full configuration, the UE 102 releases the first configuration or the particular configuration in the first configuration after (e.g., in response to) receiving 330 the first configuration activation command, transmitting 331 the acknowledgement, successfully performing the 332 the random access procedure, or receiving the first DCI on a PDCCH addressed to the UE identity of the UE 102 on the cell 124B.
  • the DU 174 releases the first configuration or the particular configuration in the first configuration after (e.g., in response to) transmitting 330 the first configuration activation command, receiving 331 the acknowledgement, successfully performing the 332 the random access procedure, or receiving a particular transmission from the UE 102 on the cell 124B.
  • the particular transmission is a PUCCH transmission.
  • the transmission is a PUSCH transmission.
  • the DU 174 after transmitting the first configuration activation command, the DU 174 generates a DCI and a CRC of the DCI, scrambles the CRC with the UE identity of the UE 102, and transmits the DCI and scrambled CRC on a PDCCH on the cell 124B.
  • the UE 102 receives the DCI and scrambled CRC and verifies that the scrambled CRC is valid using the UE identity, the UE 102 transmits the PUSCH transmission to the DU 174 on the cell 124B.
  • the first configuration or the particular configuration is a first CellGroupConfig IE (i.e., the first configuration includes configuration parameters defined in the first CellGroupConfig IE), and the configuration 1 is a second CellGroupConfig IE.
  • the UE 102 uses a UE MAC entity (e.g., MAC 204B) to communicate with the DU 174 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331).
  • the base station 104 configures whether the UE 102 resets the UE MAC entity upon receiving the first configuration activation command.
  • the base station 104 includes a MAC reset indication in the configuration 1 or element 1 to configure the UE 102 to reset the UE MAC entity, and the base station 104 excludes the MAC reset indication in the configuration 1 or element 1 to configure the UE 102 not to reset the UE MAC entity. If the configuration 1 or element 1 includes the MAC reset indication, the UE 102 resets the UE MAC entity in response to the MAC reset indication upon receiving the first configuration activation command.
  • the UE 102 refrains from resetting the UE MAC entity upon or when receiving the first configuration activation command.
  • the configuration 1 or element 1 does not include the MAC reset indication and includes an indication that the configuration is a full configuration
  • the UE 102 resets the UE MAC entity upon or when receiving 330 the first configuration activation command.
  • the configuration 1 or element 1 does not include the MAC reset indication and the indication that the configuration is a full configuration
  • the UE 102 refrains from resetting the UE MAC entity upon or when receiving 330 the first configuration activation command.
  • the base station 104 uses a DU MAC entity (e.g., NR MAC 204B) to communicate with the UE 102 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331). If the base station 104 includes the MAC reset indication in the configuration 1 or element 1, the DU 174 resets the DU MAC entity in response to the MAC reset indication after transmitting 330 the first configuration activation command, receiving 331 the acknowledgement, or determining that the UE 102 connects to the cell 124B in the event 332 or 336.
  • a DU MAC entity e.g., NR MAC 204B
  • the DU 174 refrains from resetting the DU MAC entity after (e.g., in response to) PATENT APPLICATION Attorney Docket No.: 31730/304655-00 transmitting 330 the first configuration activation command.
  • the DU 174 continues to use the retained (i.e., un-reset) DU MAC entity to communicate with the UE 102 after transmitting 330 the first configuration activation command, receiving 331 the acknowledgement, or determining that the UE 102 connects to the cell 124B in the event 332 or 336.
  • the DU 174 includes the MAC reset indication in a MAC- CellGroupConfig IE in the configuration 1 (e.g., CellGroupConfig IE). In other implementations, the DU 174 includes the MAC reset indication in the CellGroupConfig IE and outside the MAC-CellGroupConfig IE. In yet other implementations, the DU 174 includes the MAC reset indication in the element 1 and outside the configuration 1.
  • the DU 174 resets the DU MAC entity after transmitting 330 the first configuration activation command, receiving 331 the acknowledgement, or determining that the UE 102 connects to the cell 124B in the event 332 or 336.
  • the DU 174 releases the DU MAC entity and establishes a new DU MAC entity for communication with the UE 102 via the cell 124B instead of resetting the DU MAC entity.
  • the DU 174 refrains from resetting the DU MAC entity after transmitting (e.g., in response to) 330 the first configuration activation command.
  • the base station 104 e.g., the DU 174 or CU 172 includes a MAC retention indication in a configuration or element (e.g., the configuration 1 or element 1) to configure the UE 102 to not reset the UE MAC entity, and excludes the MAC retention indication in the configuration or element to configure the UE 102 to reset the UE MAC entity.
  • the UE 102 refrains from resetting the UE MAC entity in response to the MAC retention indication upon receiving a configuration activation command (e.g., the first configuration activation command). Otherwise, if the configuration or element does not include the MAC retention indication, the UE 102 resets the UE MAC entity upon or when receiving the configuration activation command.
  • the DU 174 uses a DU MAC entity (e.g., NR MAC 204B) to communicate with the UE 102 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331).
  • the DU 174 refrains from resetting a DU MAC entity in response to the MAC retention indication after transmitting the configuration activation command (e.g., the first configuration activation command) to the UE 102.
  • the DU 174 continues to use the retained (i.e., un-reset) DU MAC entity to communicate with the UE 102 after transmitting 330 the first configuration activation command, receiving 331 the acknowledgement, or determining that the UE 102 connects to the cell 124B at event 332 or 336.
  • the DU 174 includes the MAC retention indication in a MAC-CellGroupConfig IE in the configuration 1 (e.g., CellGroupConfig IE). In other implementations, the DU 174 includes the MAC retention indication in the CellGroupConfig IE and outside the MAC-CellGroupConfig IE. In yet other implementations, the DU 174 includes the MAC retention indication in the element 1 and outside the configuration 1. [0135] Otherwise, if the configuration 1 or element 1 does not include the MAC retention indication, the DU 174 resets the DU MAC entity after (e.g., in response to) transmitting 330 the first configuration activation command.
  • base station 104 do or do not include an indication that the configuration 1 is a full configuration. If the base station 104 includes, in the configuration 1 or element 1, the indication that the configuration 1 is a full configuration, the base station 104 refrains from including the MAC retention indication in the configuration 1 or element 1. Otherwise, if the base station 104 does not include, in the configuration 1 or element 1, the indication that the configuration 1 is a full configuration, the base station 104 includes the MAC retention indication in the configuration 1 or element 1.
  • the base station 104 (e.g., the DU 174 or CU 172) includes a MAC partial reset indication in a configuration or element (e.g., the configuration 1 or element 1) to configure the UE 102 to partially reset the UE MAC entity, and excludes the MAC partial reset indication in the configuration or element to configure that the UE 102 fully resets the UE MAC entity. If the configuration or element includes the MAC partial reset indication, the UE 102 partially resets the UE MAC entity upon receiving a configuration activation command (e.g., the first configuration activation command).
  • a configuration activation command e.g., the first configuration activation command
  • the UE 102 fully resets the UE MAC entity after (e.g., in response to) receiving the configuration activation command.
  • the UE 102 retains (e.g., maintains or keeps) an operation state of the UE MAC entity or omits one or more actions that the UE 102 performs when the UE 102 fully resets the UE MAC entity.
  • the DU 174 partially resets the DU MAC entity in response to the MAC partial reset indication after transmitting the configuration activation command (e.g., the first configuration activation command) to the UE 102.
  • the DU 174 includes the MAC partial reset indication in a MAC-CellGroupConfig IE in the configuration 1 (e.g., CellGroupConfig IE).
  • the DU 174 includes the MAC partial reset indication in the CellGroupConfig IE and outside the MAC-CellGroupConfig IE.
  • the DU 174 includes the MAC partial reset indication in the element 1 and outside the configuration 1. [0140] Otherwise, if the configuration 1 or element 1 does not include the MAC partial reset indication, the DU 174 fully resets the DU MAC entity after (e.g., in response to) transmitting 330 the first configuration activation command. [0141] In some implementations, base station 104 does or does not include an indication that the configuration 1 is a full configuration. In some implementations, if the base station 104 includes, in the configuration 1 or element 1, the indication that the configuration 1 is a full configuration, the base station 104 refrains from including the MAC partial reset indication in the configuration 1 or element 1.
  • the base station 104 if the base station 104 does not include, in the configuration 1 or element 1, the indication that the configuration 1 is a full configuration, the base station 104 includes the MAC partial reset indication in the configuration 1 or element 1. In some alternative implementations, the base station 104 includes the MAC partial reset indication in cases where the base station 104 includes, in the configuration 1 or element 1, the indication that the configuration 1 is a full configuration.
  • the base station 104 (e.g., the DU 174 or CU 172) does not include, in a configuration or element (e.g., the configuration 1 or element 1) or an RRC message (e.g., events 316, 318) including the configuration or element, an indication related to resetting the UE MAC entity.
  • the UE 102 partially resets the UE MAC entity after (e.g., in response to) receiving the first configuration activation command.
  • the DU 174 partially resets the DU MAC entity after transmitting the first configuration activation command, receiving 331 the acknowledgement, performing 336 the random access procedure with the UE 102, or determining that the UE 102 connects to the cell 124B.
  • the UE 102 determines to reset or resets the UE MAC entity as described above, the UE 102 resets the UE MAC entity before performing 332 the random access procedure or communicating 336 with the base station 104 via the cell 124B.
  • the UE 102 when the UE 102 resets the UE MAC entity, the UE 102 performs at least one of the following actions for the UE MAC entity (i.e., UE MAC reset or full UE MAC reset): (i) initialize Bj for configured logical channel(s) to zero; (ii) stop one or more timers; (iii) consider timeAlignmentTimer(s) as expired, if the UE 102 is configured to perform the random access procedure (e.g., the event 332) in the configuration (e.g., the configuration 1); (iv) set new data indicator(s) (NDI(s)) for UL HARQ process(es) to value 0; (v) set NDI(s) for HARQ process ID(s) to value 0 for monitoring PDCCH in Sidelink resource allocation mode 1; (vi) flush Msg3 buffer; (vii) flush MSGA buffer; (viii) cancel, if any, triggered Scheduling Request procedure;
  • the DU 174 when the DU 174 resets the DU MAC entity, the DU 174 performs at least one of the following actions for the DU MAC entity (i.e., DU MAC reset or full DU MAC reset): (i) stop one or more timers; (ii) consider timeAlignmentTimer(s) that the DU 174 starts and/or maintains for the UE 102 as expired, if the UE 102 is configured to perform the random access procedure (e.g., the event 332) in the configuration (e.g., the configuration 1); (iii) set NDI(s) for DL HARQ process(es) to value 0; (iv) flush soft buffers for UL HARQ process(es); (v) for each of the UL HARQ process(es), consider the next received transmission for a TB as the very first transmission; (vi) reset one or more counters (e.g., BFI_COUNTERs and/or
  • the UE 102 determines to partially or fully reset the UE MAC entity.
  • the UE 102 when the UE 102 resets the UE MAC entity as described above, the UE 102 fully resets the UE MAC entity (i.e., a full UE MAC reset). In the full UE MAC reset, the UE 102 performs some or all of the actions described above.
  • the UE 102 when the UE 102 resets the UE MAC entity as described above, the UE 102 partially resets the UE MAC entity (i.e., a partial UE MAC reset).
  • the UE 102 performs a subset or portion of the some or all of the actions in the full UE MAC reset.
  • the partial UE MAC reset includes at least one of the following actions: (i) consider timeAlignmentTimer(s) of the UE 102 as expired, if the UE 102 is configured to perform the random access procedure (e.g., the event 332) in the configuration (e.g., the configuration 1); (ii) flush Msg3 buffer; (iii) flush MSGA buffer; (iv) release, if any, Temporary C-RNTI; and/or (v) reset one or more counters (e.g., BFI_COUNTERs and/or LBT_COUNTERs).
  • the partial UE MAC reset further includes at least one of the following actions: (i) cancel, if any, triggered Scheduling Request procedure; (ii) cancel, if any, triggered Buffer Status Reporting procedure; (iii) cancel, if any, triggered Power Headroom Reporting procedure; (iv) cancel, if any, triggered consistent LBT failure; (v) cancel, if any, triggered BFR; (vi) cancel, if any, triggered Sidelink Buffer Status Reporting procedure; (vii) cancel, if any, triggered Pre-emptive Buffer Status Reporting procedure; (viii) cancel, if any, triggered Timing Advance Reporting procedure; (ix) cancel, if any, PATENT APPLICATION Attorney Docket No.: 31730/304655-00 triggered Recommended bit rate query procedure; (x) cancel, if any, triggered configured uplink grant confirmation; (xi) cancel, if any, triggered configured sidelink grant confirmation; (xii) cancel,
  • the partial UE MAC reset further includes at least one of the following actions: (i) stop a first portion of the one or more timers and retain the rest of the one or more timers; (ii) set new data indicator(s) (NDI(s)) for UL HARQ process(es) to value 0; (iii) set NDI(s) for HARQ process ID(s) to value 0 for monitoring PDCCH in Sidelink resource allocation mode 1; (iv) flush soft buffers for DL HARQ process(es); and/or (v) for each of the DL HARQ process(es), consider the next received transmission for a TB as the very first transmission.
  • the DU 174 determines to partially or fully reset the DU MAC entity.
  • the DU 174 when the DU 174 resets the DU MAC entity as described above, the DU 174 fully resets the DU MAC entity (i.e., a full DU MAC reset). In the full DU MAC reset, the DU 174 performs some or all of the actions described above. In other implementations, when the DU 174 resets the DU MAC entity as described above, the DU 174 partially resets the DU MAC entity (i.e., a partial DU MAC reset).
  • the DU 174 performs a subset or portion of the some or all of the actions in the full DU MAC reset.
  • the partial DU MAC reset includes at least one of the following actions in the partial MAC reset: (i) consider timeAlignmentTimer(s), that the DU 174 starts and/or maintains for the UE 102, as expired, if the UE 102 is configured to perform the random access procedure (e.g., the event 332) in the configuration (e.g., the configuration 1); and/or (ii) reset one or more counters (e.g., BFI_COUNTERs and/or LBT_COUNTERs).
  • timeAlignmentTimer(s) that the DU 174 starts and/or maintains for the UE 102, as expired, if the UE 102 is configured to perform the random access procedure (e.g., the event 332) in the configuration (e.g., the configuration 1); and/or (ii) reset one or more counters (e.g
  • the partial DU MAC reset includes at least one of the following actions for the MAC entity (i.e., DU MAC reset): (i) stop a first portion of the one or more timers and retain the rest of the one or more timers; (ii) set NDI(s) for DL HARQ process(es) to value 0; (iii) flush soft buffers for UL HARQ process(es); (iv) for each of the UL HARQ process(es), consider the next received transmission for a TB as the very first transmission; and/or (v) reset one or more counters (e.g., BFI_COUNTERs and/or LBT_COUNTERs).
  • DU MAC reset one or more counters
  • the configuration 1 do or do not include one or more RLC reestablishment indications (e.g., reestablishRLC field(s)) configuring the UE 102 to reestablish one or more RLC entities (e.g., RLC 206B) that the UE 102 uses to communicate with the DU 174 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331).
  • RLC reestablishment indications e.g., reestablishRLC field(s)
  • RLC entities e.g., RLC 206B
  • the configuration 1 includes the RLC reestablishment indication configuring the UE 102 to reestablish an RLC entity (e.g., RLC 206B) that the UE 102 uses to communicate RLC PDU(s) with the base station 104 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331)
  • the UE 102 reestablishes the RLC entity in response to the RLC reestablishment indication.
  • the UE 102 reestablishes the RLC entity before performing 332 the random access procedure or communicating 336 with the base station 104 via the cell 124B.
  • the UE 102 reestablishes the RLC entity while or after performing 332 the random access procedure.
  • the UE 102 when the UE 102 reestablishes the RLC entity, the UE 102 performs at least one of the following actions for the RLC entity: (i) discard RLC SDU(s), RLC SDU segment(s), and RLC PDU(s), if any; (ii) stop and reset timer(s), if running; (iii) reset state variables to initial values.
  • the state variables and timer(s) are currently defined (e.g., in 3GPP specification 38.322).
  • the UE 102 refrains from reestablishing the RLC entity upon or when receiving the first configuration activation command. In other words, the UE 102 refrains from preforming the actions for reestablishing the RLC entity of the UE 102 upon or when receiving the first configuration activation command. In some implementations, if the configuration 1 or element 1 does not include the RLC reestablishment indication and includes an indication that the configuration 1 is a full configuration, the UE 102 reestablishes the RLC entity of the UE 102 upon or when receiving the first configuration activation command.
  • the UE 102 refrains from reestablishing the RLC entity upon or when receiving the first configuration activation command.
  • the DU 174 reestablishes an RLC entity (e.g., NR RLC 206B) that the DU 174 uses to communicate with the RLC entity of the UE 102 (e.g., the events 302, 304, 318, 320, 324, 330, and/or 331) in response to the RLC reestablishment indication.
  • an RLC entity e.g., NR RLC 206B
  • the DU 174 reestablishes the RLC entity after transmitting the first configuration activation command, receiving an acknowledgement for the first configuration PATENT APPLICATION Attorney Docket No.: 31730/304655-00 activation command from the UE 102, or determining that the UE 102 connects to the cell 124B.
  • the acknowledgement is a HARQ ACK.
  • the acknowledgement is a MAC CE.
  • the acknowledgement is a PUCCH transmission.
  • the DU 174 when the base station 104 reestablishes the RLC entity, the DU 174 performs at least one of the following actions for the RLC entity: (i) discard RLC SDU(s), RLC SDU segment(s), and RLC PDU(s), if any; (ii) stop and reset timer(s), if running; and/or (iii) reset state variables to initial values.
  • the state variables and timer(s) are currently defined (e.g., in 3GPP specification 38.322). [0155]
  • the description for the configuration 1 above applies to the configuration(s) 2, ..., N as well.
  • the CU 172 transmits 338 a CU-to-DU message (e.g., a UE Context Modification Request message) to the DU 174 to indicate to the DU 174 to stop communicating with the UE 102 and/or to release or suspend resources of the cell 124A configured for the UE 102.
  • a CU-to-DU message e.g., a UE Context Modification Request message
  • the DU 174 stops communicating on the cell 124A with the UE 102 and/or releases or suspends resources of the cell 124A configured for the UE 102, and transmits 340 a DU-to-CU message (e.g., a UE Context Modification Response message) to the CU-172.
  • the events 338 and 340 are collectively referred to in Fig.3 as procedure 394 (e.g., UE Context Modification procedure).
  • the base station 104 includes a CU 172, a source DU (S-DU) 174A, and a target DU (T-DU) 174B.
  • the S-DU 174A operates the cell 124A and, in some implementations, operates the cell 124B, while the T-DU 174B operates the cell 124C.
  • the scenario 400 is similar to the scenario 300.
  • the descriptions for the scenario 300 can generally apply to the scenario 400.
  • the descriptions for cell 124B in the scenario 300 can apply to the cell 124C.
  • some descriptions with regard to the scenario 300 can apply to the scenario 400, but to one or both of the S-DU 174A or the T-DU 174B (e.g., events 408, 410, 432, 434, etc.).
  • the CU 172 transmits 438 a CU-to-DU message (e.g., a UE Context Release Command message) to the S-DU 174A to release a UE context of the UE 102.
  • a CU-to-DU message e.g., a UE Context Release Command message
  • the S-DU 174A releases a UE context of the UE 102 and transmits 440 a PATENT APPLICATION Attorney Docket No.: 31730/304655-00 DU-to-CU message (e.g., a UE Context Release Complete message) to the CU-172.
  • the CU 172 transmits 438 a CU-to-DU message (e.g., a UE Context Modification Request message) to the S-DU 174A to indicate to the S-DU 174A to stop communicating with the UE 102 and/or to release or suspend resources, of the cell 124A, configured for the UE 102.
  • the S-DU 174A stops communicating on the cell 124A with the UE 102 and/or releases or suspends resources of the cell 124A, configured for the UE 102, and transmits 440 a DU-to-CU message (e.g., a UE Context Modification Response message) to the CU-172.
  • a DU-to-CU message e.g., a UE Context Modification Response message
  • a scenario 500A the base station 106 operates as an MN, and the base station 104 operates as an SN.
  • the SN 104 includes a CU 172 and a DU 174.
  • the scenario 500A is similar to the scenario 300, except that the scenario 500A is a DC scenario, and the scenario 300 is a single connectivity (SC) scenario.
  • the UE 102 in DC communicates with the MN 106 and with SN 104.
  • the UE 102 communicates with the DU 174 on cell 124A and communicates with the CU 172 via the DU 174 using a first configuration, similar to the event 302.
  • the UE 102 in DC communicates 502 UL PDUs and/or DL PDUs with the MN 106 and/or SN 104 via radio bearers, which include SRBs and/or DRB(s).
  • the MN 106 and/or the SN 104 configure the radio bearers for the UE 102.
  • the UE 102 in DC communicates 502 UL PDUs and/or DL PDUs with the SN 104 on an SCG that the SN 104 configures for communication with the UE 102.
  • the UE 102 in DC communicates UL PDUs and/or DL PDUs with the MN 106 on an MCG in accordance with an MN configuration (i.e., MCG configuration).
  • the first configuration is an SN configuration (i.e., SCG configuration).
  • the MN configuration the MN 106 configures the MCG, which includes at least one serving cell (e.g., the cell 126 and/or other cell(s)) operated by the MN 106.
  • the SN 106A configures the SCG, which includes at least one serving cell (e.g., the cell 124A and/or other cell(s)) operated by the SN 104.
  • the MN configuration includes multiple configuration parameters, and the UE 102 receives the configuration parameters in one or more RRC messages from the MN 106.
  • the first configuration includes multiple configuration parameters, and the UE 102 receives the configuration parameters in one or more RRC messages from the SN 104 (e.g., via the MN 106) or on an SRB (e.g., SRB3) that the MN 106 or SN 104 configures to exchange RRC messages between the UE 102 and the SN 104.
  • the MN 106 while communicating in DC with the MN 106 and SN 104, the MN 106 performs 580 a fast serving cell configuration procedure with the UE 102, similar to the procedure 380. In some implementations, while communicating in DC with the MN 106 and SN 104, the UE 102 transmits the at least one measurement report to the CU 172 via the DU 174 and cell 124A in the events 504 and 506, similar to the events 304 and 306, respectively.
  • the UE 102 while communicating in DC with the MN 106 and SN 104, transmits 505 at least one measurement report to the MN 106 via the cell 126.
  • the MN 106 in turn transmits 507 the at least one measurement report to the CU 172.
  • the MN 106 generates at least one SN message including the at least one measurement report and transmits the at least one SN message to the CU 172 in the event 507.
  • the at least one SN message includes RRC Transfer message(s) and/or SN Modification Request message(s).
  • the base station 104 determines to prepare the cell 124B for the UE 102, as described for Fig.3.
  • the events 590, 592, 516, 518, 520, 522, 524, 526, 528, 530, 531, 532, 534, 536, and 594 are similar to the events 390, 392, 316, 318, 320, 322, 324, 326, 328, 330, 331, 332, 334, 336, and 394, respectively.
  • a scenario 500B is generally similar to the scenario 500A, except that the SN 104 transmits 517, 519 the RRC reconfiguration message to the UE 102 via the MN 106 and receives 521, 523 the RRC reconfiguration complete message from the UE 102 via the MN 106.
  • the SN 104 generates a first SN message (e.g., SN Modification Required message, SN Modification Required message, or RRC Transfer message), including the RRC reconfiguration message, and transmits the first SN message to the MN 106 in the event 517.
  • the MN 106 generates a second SN message (e.g., SN Reconfiguration Complete message or RRC Transfer message), including the RRC reconfiguration complete message, and transmits the second SN message to the SN 104 in the event 523.
  • a scenario 600A the base station 106 operates as an MN, and the base station 104 operates as an SN, similar to the scenarios 300-500B.
  • the SN 104 includes a CU 172, an S-DU 174A, and a T-DU 174B, similar to the base station 104 in the scenario 400.
  • some descriptions with regard to the scenarios 300-500B can apply to the scenario 600A, but to one or both of the S-DU 174A or the T-DU 174B (e.g., events 608, 610, 632, 634, etc.).
  • a scenario 600B similar to the scenarios 300-500B and 600A, except that that the SN 104 transmits 617, 619 the RRC reconfiguration message to the UE 102 via the MN 106 and receives 621, 623 the RRC reconfiguration complete message from the UE 102 via the MN 106.
  • the base station 104 operates as an MN and an SN, similar to the scenarios 300-600B.
  • the base station 104 includes a CU 172, a master DU (M-DU) 174A and a secondary DU (S-DU) 174B.
  • M-DU master DU
  • S-DU secondary DU
  • the CU 172 operates with the M-DU 174A as an MN, similar to the base station 104 in the Fig.3 or the MN 106 in Figs.5A-6B, and the CU 172 operates with the S-DU 174B as an SN, similar to the SN 104 in Figs.5A-6B.
  • the UE 102 initially communicates 702 in DC with the M-DU 174A and S-DU 174B, and the UE 102 communicates 702 with the CU 172 via the M-DU 174A and S-DU 174B.
  • the UE 102 communicates with the S-DU 174B on cell 124A and communicates with the CU 172 via the S-DU 174B, using a first configuration.
  • Events 704 and 706 are similar to the events 304 and 306.
  • the UE 102 transmits 705 at least one measurement report to the M-DU 174A, similar to the event 304.
  • the M-DU 174A in turn transmits 707 at least one DU-to-CU message, including the at least one measurement report, to the CU 172, similar to the event 306.
  • a scenario 700B similar to the scenarios 300-600B and 700A, except that the CU 172 transmits 717, 719 the RRC reconfiguration message to the UE 102 via the M-DU 174A and receives 721, 723 the RRC reconfiguration complete message from the UE 102 via the M-DU 174A.
  • the base station 104 operates as an MN and an SN, similar to the scenarios 300-700B.
  • the base station 104 includes a CU 172, a master DU (M-DU) 174A, a secondary DU (S-DU) 174B, and a T-DU 174C.
  • the CU 172 operates with the M-DU 174A as an MN and operates with the S-DU 174B as an SN.
  • some descriptions with regard to the scenarios 300-700B can apply to the scenario 800A, but to one or both of the S-DU 174A or the T-DU 174B (e.g., events 808, 810, 832, 834, etc.).
  • a scenario 800B similar to the scenarios 300-700B and 800A, except that that the CU 172 transmits 817, 819 the RRC reconfiguration message to the UE 102 via the M-DU 174A and receives 821, 823 the RRC reconfiguration complete message from the UE 102 via the M-DU 174A.
  • a UE e.g., the UE 102
  • a RAN node e.g., the base station 104 or 106, or the DU 174
  • Fig.9 illustrates a method 900, which can be implemented by a DU (e.g., the DU 174), for preventing the inclusion of an RLC reestablishment indication for a UE (e.g., the UE 102).
  • the method 900 begins at block 902, where the DU communicates with a UE using an RLC bearer and a first configuration (e.g., events 302, 380, 502, 580, 702, 780).
  • the DU generates a second configuration for later activation and refrains from including an RLC reestablishment indication for the RLC bearer in the second configuration.
  • the DU transmits a first DU-to-CU message, including the second configuration, to the CU (e.g., events 310, 390, 380, 510, 590, 580, 710, 790, 780).
  • the DU transmits the second configuration to the UE (e.g., events 316, 380, 516, 517, 580, 716, 717, 780).
  • the DU transmits a configuration activation command to the UE to activate the second configuration (e.g., events 330, 380, 530, 580, 730, 780).
  • Fig.10 illustrates a method 1000, which can be implemented by a RAN (e.g., the baes station 104/106 or DU 174), for configuring and activating a configuration for a UE (e.g., the UE 102).
  • a RAN e.g., the baes station 104/106 or DU 174
  • the method 1000 begins at block 1002, where the RAN node communicates with a UE using an RLC bearer and a first configuration (e.g., events 302, 380, 402, 480, 502, 580, 602, 680, 702, 780, 802, 880).
  • a first configuration e.g., events 302, 380, 402, 480, 502, 580, 602, 680, 702, 780, 802, 880.
  • the RAN node determines PATENT APPLICATION Attorney Docket No.: 31730/304655-00 whether the second configuration is to be activated later. If the RAN node determines that the second configuration is to be activated later, the flow proceeds to block 1008.
  • the RAN node refrains from including an RLC reestablishment indication for the RLC bearer in the second configuration. Otherwise, if the RAN node determines that the second configuration is not to be activated later, the flow proceeds to block 1010. That is, the RAN node determines that the second configuration is to be applied immediately by the UE when the UE receives the second configuration. At block 1010, the RAN node includes an RLC reestablishment indication for the RLC bearer in the second configuration. The flow proceeds to block 1012 from block 1010 as well as from block 1008.
  • the RAN node (e.g., a DU) transmits a first DU-to-CU message, including the second configuration, to a CU.
  • the RAN node transmits the second configuration to the UE (e.g., events 316, 318, 380, 416, 418, 480, 516, 518, 517, 519, 580, 616, 618, 617, 619, 716, 718, 717, 719, 780).
  • Fig.11A illustrates a method 1100A, which can be implemented by DU (e.g., the DU 174) for reestablishing an RLC entity for a UE (e.g., the UE 102).
  • the method 1100A begins at block 1102, where the DU communicates with a UE on a first cell using an RLC entity (e.g., events 302, 380, 502, 580, 702, 780).
  • the DU performs a serving cell change with the UE from the first cell to a second cell (e.g., events 332, 336, 380, 532, 536, 580, 732, 736, 780).
  • the DU determines whether the serving cell change is triggered by a configuration activation command. If the DU determines that the serving cell change is not triggered by a configuration activation command at block 1106, the flow proceeds to block 1108.
  • the DU reestablishes the RLC entity.
  • the DU communicates with the UE on the second serving cell using the RLC entity (e.g., events 332, 336, 380, 532, 536, 580, 732, 736, 780).
  • the DU indicates to the CU that the RLC entity is reestablished (i.e., an RLC reestablishment occurs for a radio bearer with which the RLC entity is associated).
  • the DU transmits a DU-to-CU message to the CU to indicate that the RLC entity is reestablished.
  • Fig.11B is a flow diagram of an example method 1100B similar to the method 1100A, except that method 1100B includes block 1107 instead of block 1106.
  • the DU determines whether the UE is configured to reestablish an RLC entity. If the DU determines that the UE is configured to reestablish an RLC entity, the flow proceeds to block 1108. Otherwise, if the DU determines that the UE is not configured to reestablish an RLC entity, the flow proceeds to block 1114.
  • Fig.12 illustrates a method 1200, which can be implemented by a UE (e.g., the UE 102), for reestablishing an RLC entity for communication with a RAN (e.g., the DU 174, CU 172, base station 104 or 106, or RAN 105).
  • a UE e.g., the UE 102
  • a RAN e.g., the DU 174, CU 172, base station 104 or 106, or RAN 105.
  • the method 1200 begins at block 1202, where the UE communicates with the RAN using a first configuration and an RLC entity (e.g., events 302, 402, 502, 602, 702, 802).
  • the UE receives an RRC message, including a second configuration, from the RAN (e.g., events 316, 318, 416, 418, 516, 518, 517, 519, 616, 618, 617, 619, 716, 718, 717, 719, 816, 818, 817, 819).
  • the UE receives a configuration activation command from the RAN to activate the second configuration (e.g., events 330, 380, 430, 530, 580, 630, 680, 730, 780, 830, 880).
  • the UE determines whether the second configuration includes an RLC reestablishment indication for the RLC entity. If the UE determines that the second configuration includes an RLC reestablishment indication for the RLC entity, the flow proceeds to blocks 1210.
  • the UE reestablishes the RLC entity in response to the configuration activation command.
  • the flow proceeds to block 1212.
  • the UE refrains from reestablishing the RLC entity in response to the configuration activation command.
  • the flow proceeds to block 1214 from block 1210 as well as from block 1112.
  • the UE performs a random access procedure with the RAN.
  • the UE communicates with the RAN using the second configuration and RLC entity.
  • Fig.13 illustrates a method 1300, which can be implemented by a UE (e.g., the UE 102), for reestablishing an RLC entity for communication with a RAN (e.g., the DU 174, CU 172, base station 104 or 106, or RAN 105).
  • the method 1300 begins at block 1302, where the UE communicates with the RAN using a first configuration and an RLC entity (e.g., events 302, 402, 502, 602, 702, 802).
  • the UE receives an RRC message including a second configuration from the RAN, wherein the second configuration includes an RLC reestablishment indication (e.g., events 316, 318, 416, 418, 516, 518, 517, 519, 616, 618, 617, 619, 716, 718, 717, 719, 816, 818, 817, 819).
  • the UE determines whether the RRC message configures such that the second configuration is to be activated by a configuration activation command. If the UE determines that the RRC message configures such that the second configuration is to be activated by a configuration activation command at block 1308, the flow proceeds to blocks 1308.
  • the UE refrains from reestablishing the RLC entity in response to the RRC message.
  • the UE receives a configuration activation command from the RAN to activate the second configuration (e.g., events 330, 380, 430, 480, 530, 580, 630, 680, 730, 780, 830, 880).
  • the UE reestablishes the RLC entity in response to the configuration activation command.
  • the flow proceeds to block 1314.
  • the UE reestablishes the RLC entity in response to the RRC message.
  • “message” is used and can be replaced by “information element (IE)”, and vice versa.
  • “IE” is used and can be replaced by “field”, and vice versa.
  • “configuration” can be replaced by “configurations” or “configuration parameters”, and vice versa.
  • the “configuration activation command” can be replaced by “serving cell change command”, “Layer 1/Layer 2 PATENT APPLICATION Attorney Docket No.: 31730/304655-00 switching command”, “lower layer switching command” or “ lower layer serving cell change command”.
  • the “fast serving cell configuration procedure” can be replaced by “fast serving cell change procedure”.
  • a user device in which the techniques of this disclosure can be implemented can be any suitable device capable of wireless communications such as a smartphone, a tablet computer, a laptop computer, a mobile gaming console, a point-of-sale (POS) terminal, a health monitoring device, a drone, a camera, a media-streaming dongle or another personal media device, a wearable device such as a smartwatch, a wireless hotspot, a femtocell, or a broadband router.
  • the user device in some cases may be embedded in an electronic system such as the head unit of a vehicle or an advanced driver assistance system (ADAS).
  • ADAS advanced driver assistance system
  • the user device can operate as an internet-of-things (IoT) device or a mobile-internet device (MID).
  • IoT internet-of-things
  • MID mobile-internet device
  • the user device can include one or more general-purpose processors, a computer-readable memory, a user interface, one or more network interfaces, one or more sensors, etc.
  • Modules may can be software modules (e.g., code, or machine- readable instructions stored on non-transitory machine-readable medium) or hardware modules.
  • a hardware module is a tangible unit capable of performing certain operations and may be configured or arranged in a certain manner.
  • a hardware module can comprise dedicated circuitry or logic that is permanently configured (e.g., as a special-purpose processor, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), a digital signal processor (DSP), etc.) to perform certain operations.
  • a hardware module may also comprise programmable logic or circuitry (e.g., as encompassed within a general-purpose processor or other programmable processor) that is temporarily configured by software to perform certain operations.
  • the decision to implement a hardware module in dedicated and permanently configured circuitry, or in temporarily configured circuitry may be driven by cost and time considerations.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un équipement utilisateur (UE) communique avec un réseau d'accès radio (RAN) selon une première configuration, comprenant l'utilisation d'une entité de commande de liaison radio (RLC) et la réception, en provenance du RAN, d'une seconde configuration destinée à être utilisée après la réception d'une instruction d'activation ; reçoit l'instruction d'activation en provenance du RAN ; et en réponse à l'instruction d'activation : utilise la seconde configuration pour communiquer avec le RAN, comprenant la détermination du fait qu'il faut ou non rétablir l'entité RLC conformément à une indication provenant du RAN.
PCT/US2023/033564 2022-09-23 2023-09-23 Gestion de fonctionnement de protocole de commande de liaison radio pour un changement rapide de cellule de desserte WO2024064399A1 (fr)

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