Method and apparatus of configuring user equipment (UE)
Predefined reference configurations for 5G UEs in RRC inactive/idle states simplify RRC reconfiguration, reducing complexity and overhead, and improving network access speed through delta configurations and state alignment.
Patent Information
- Application Number
- PCT/CN2025/087536
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-02-19
AI Technical Summary
Existing 5G RRC reconfiguration is complex and leads to significant signaling overhead and slow network access due to large reconfiguration sizes, especially when UEs transition to RRC inactive or idle states.
Implementing predefined or configured reference configurations for radio protocol layers that can be maintained by UEs in RRC inactive or idle states, allowing for delta configurations and alignment of configurations between UEs and the network upon state transitions.
Reduces RRC reconfiguration complexity and overhead, enhancing network access speed by maintaining basic configurations during state transitions and aligning configurations efficiently.
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Figure CN2025087536_19022026_PF_FP_ABST
Abstract
Description
METHOD AND APPARATUS OF CONFIGURING USER EQUIPMENT (UE)TECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to techniques of configuring user equipment (UE) .BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .SUMMARY
[0003] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0004] Some implementations of the methods and apparatuses described herein may further include a UE for wireless communication, which may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive, from a first network equipment (NE) , a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by the UE in radio resource control (RRC) connected state and can be maintained when the UE is in RRC inactive or RRC idle state; receive, from the first NE or a second NE, information indicating whether to keep or release the first configuration; and keep or release the first configuration based on the information indicating whether to keep or release the first configuration.
[0005] In some implementations of the methods and apparatuses described herein, the radio protocol layer operations include one or multiple of: physical (PHY) layer operations, media access control (MAC) layer operations, radio link control (RLC) layer operations, RRC layer operations, service data adaptation protocol (SDAP) layer operations or packet data convergence protocol (PDCP) layer operations.
[0006] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to cause the UE to: receive, from the first NE, a set of first configurations including the first configuration, wherein each first configuration is generated by radio access network (RAN) side, operations administration and maintenance (OAM) , or core network (CN) side.
[0007] In some implementations of the methods and apparatuses described herein, in the case that the first configuration is generated by the CN side and carried by a non-access stratum (NAS) message, the at least one processor is configured to further cause the UE to: indicate the first configuration to the first NE.
[0008] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to further cause the UE to receive from the first NE one or multiple of: information indicating where the first configuration is generated; information indicating whether the first configuration will be kept or released in the case that the UE transitions into RRC idle state or RRC inactive state from RRC connected state; information for identifying a servicing cell or RAN of the UE where the first configuration is configured; or information indicating an area or a list of cells where the first configuration can be applied.
[0009] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to further cause the UE to: determine a current configuration used for radio protocol layer operations based on the first configuration; and receive an updated configuration to update the current configuration used for radio protocol layer operations, wherein the updated configuration is: an updated self-contained configuration that will be used for radio protocol layer operations; a delta configuration compared with the first configuration; or a delta configuration compared with the current configuration.
[0010] In some implementations of the methods and apparatuses described herein, there is at least one predefined first configuration default in the UE, and at least one processor is configured to further cause the UE to: determine a current configuration used for radio protocol layer operations based on a predefined first configuration; and receive an updated configuration to update the current configuration used for radio protocol layer operations, wherein the updated configuration is: an updated self-contained configuration that will be used for radio protocol layer operations; a delta configuration compared with the predefined first configuration; or a delta configuration compared with the current configuration.
[0011] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to further cause the UE to: receive information indicating a type of the updated configuration.
[0012] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to further cause the UE to: receive, from the first NE, a message indicating to transition into the RRC inactive state or RRC idle state from the RRC connected state; and keep the first configuration in the case of receiving information indicating to keep the first configuration in the message or before the message.
[0013] In some implementations of the methods and apparatuses described herein, in the case that the UE transitions from the RRC inactive state or RRC idle state to the RRC connected state and is connected to the second NE, the at least one processor is configured to further cause the UE to: indicate the first configuration to the second NE during or after establishing a connection with the second NE.
[0014] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to further cause the UE to: release the first configuration in the case of receiving information indicating to release the first configuration from the second NE.
[0015] In some implementations of the methods and apparatuses described herein, in the case that the UE is handed over from the first NE to the second NE, the at least one processor is configured to further cause the UE to: release the first configuration in the case of receiving information indicating to release the first configuration from the second NE during or after receiving a handover command.
[0016] In some implementations of the methods and apparatuses described herein, in the case that the information indicating whether to keep or release the first configuration indicates to keep the first configuration, the message further indicates a time duration that the first configuration needs to be kept at the UE.
[0017] In some implementations of the methods and apparatuses described herein, different first configurations are indicated to be kept or released together or separately.
[0018] Some implementations of the methods and apparatuses described herein may further include a processor for wireless communication, which may include: at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a first NE, a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; receive, from the first NE or a second NE, information indicating whether to keep or release the first configuration; and keep or release the first configuration based on the information indicating whether to keep or release the first configuration.
[0019] Some implementations of the methods and apparatuses described herein may further include a NE for wireless communication, which may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the NE to: send, to a UE, a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by the UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; and determine whether the UE will keep or release the first configuration in the case of determining to send the UE to a RRC inactive state or RRC idle state from a RRC connected state.
[0020] In some implementations of the methods and apparatuses described herein, in the case of determining to send the UE to the RRC inactive state or RRC idle state and that the UE will keep the first configuration, the at least one processor is configured to cause the NE to:maintain the first configuration after sending the UE to the RRC inactive state or RRC idle state; and indicate the first configuration to a different NE in the case that the UE transitions to a RRC connected state and is connected to the different NE.
[0021] In some implementations of the methods and apparatuses described herein, in the case of determining to handover the UE to a different NE and that the UE will keep the first configuration, the at least one processor is configured to cause the NE to: indicate the first configuration to the different NE in a handover request message.
[0022] In some implementations of the methods and apparatuses described herein, the at least one processor is configured to cause the NE to: indicate the first configuration to a CN side before or in response to sending the UE to the RRC inactive state or RRC idle state.
[0023] Some implementations of the methods and apparatuses described herein may further include a NE for wireless communication, which may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the NE to: receive a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; determine whether the UE will keep or release the first configuration; and send to the UE information indicating whether to keep or release the first configuration based on a result of determining whether the UE will keep or release the first configuration.
[0024] In some implementations of the methods and apparatuses described herein, the first configuration is received from the UE, or a different NE last serving the UE or a CN side.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.
[0026] Figure 2 illustrates an exemplary procedure of configuring UE in accordance with aspects of the present disclosure.
[0027] Figure 3 illustrates another exemplary procedure of configuring UE under scheme 1 in accordance with aspects of the present disclosure.
[0028] Figure 4 illustrates an exemplary procedure of configuring UE under scheme 3 in accordance with aspects of the present disclosure.
[0029] Figure 5 illustrates an example of a UE in accordance with aspects of the present disclosure.
[0030] Figure 6 illustrates an example of a processor in accordance with aspects of the present disclosure.
[0031] Figure 7 illustrates an example of a NE in accordance with aspects of the present disclosure.
[0032] Figure 8 illustrates a flowchart of method performed by a UE in accordance with aspects of the present disclosure.
[0033] Figure 9 illustrates a flowchart of method performed by a NE in accordance with aspects of the present disclosure.
[0034] Figure 10 illustrates another flowchart of method performed by a NE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION
[0035] In real 5G deployments, RRC reconfiguration is usually over complicated and of large size, which will lead to several issues, e.g., signaling overhead in air interface, complex RRC processing at UE and slow access to the network due to the delay of reconfiguration etc. To reduce the signaling overhead, 5G introduced the concept of reference configuration for layer 1 (L1) / layer 2 (L2) triggered mobility (LTM) and subsequent conditional primary SCG cell (PSCell) addition and change (SCPAC) configuration, such that the candidate LTM cells or candidate SCPAC PSCells can be configured using delta configuration based on the given reference configuration. However, the reference configuration concept in 5G is only applied to the LTM and SCPAC configuration, and will be released upon LTM and SCPAC is released or if UE enters RRC inactive state or RRC idle state.
[0036] Thus, the industry desires to further to improve the techniques of configuring UE, especially reducing the RRC reconfiguration complex and overhead in control plane design.
[0037] Various aspects of the present disclosure propose that even if UE enters RRC inactive state or RRC idle state, it could be beneficial for the UE to maintain (or keep or store or the like) one or more basic configurations which is for radio protocol layer operations by UE in RRC connected state. Herein, for simplification and clarity, the following terminologies are introduced and illustrated in view of various aspects of the present disclosure, and their names should not be used to unduly limit the scope of the present disclosure. Complete configuration: a self-contained configuration that can be used by the UE for complete radio operations involving all radio protocol layers, including uplink (UL) and downlink (DL) operations (if any) . The complete configuration can be provided by the network side, e.g., RAN, or OAM or CN etc., or generated by the UE via applying a delta configuration on top of (or based on or the like) a default or configured reference configuration or a configuration in use. Reference configuration: a basic configuration for operations of part or all of the radio protocol layers by a UE in RRC connected state and can be maintained when the UE is in RRC inactive state or RRC idle state, which may also be referred to as a default configuration, or a predefined configuration or common configuration or configuration profile, or the like. A reference configuration may be configured or predefined (or default or the like) . Configured reference configuration: a reference configuration explicitly configured by the RAN, e.g., via RRC signaling or message or the like (e.g., SSB message etc. ) , or by OAM via protocol data unit (PDU) session over user plane (UP) , or by CN via NAS signaling or message over either CP (e.g., conveyed in RRC signaling) or via PDU session over UP. Default reference configuration: a reference configuration predefined or specified in 3GPP standard. Both UE and NW share the same understanding on the default reference configuration. Delta configuration: the delta part of a configuration (or, the new or different configuration) compared with either a default reference configuration or configured reference configuration or a configuration in use. Configuration in use: a configuration currently used by UE for radio protocol layer operations, including uplink (UL) and downlink (DL) operations (if any) .
[0038] Exemplary radio protocol layer operations may include one or multiple of: PHY layer operations, MAC layer operations, RLC layer operations, RRC layer operations, SDAP layer operations or PDCP layer operations etc., various layer operations.
[0039] In some implementations of the present disclosure, an exemplary reference configuration may contain a configuration related to operations in any radio protocol layer, e.g., one or multiple of the following: PHY operation related configuration: channel state information (CSI) report related configuration, or SSB periodicity etc. MAC operation related configuration: carrier aggregation cells, beam failure recovery configuration etc. RLC operation related configuration: RLC mode, or RLC sequence number (SN) length etc. PDCP operation related configuration: PDCP SN length, discard timer, or header compression etc. RRC operation related configuration: measurement configuration, or report configuration etc. SDAP operation related configuration: SDAP header or mapped quality of service (QoS) flow etc.
[0040] In some other implementations of the present disclosure, an exemplary reference configuration may contain a configuration related to operations only in some specific radio protocol layers, e.g., only PHY operation related configuration, RRC operation related configuration and / or SDAP operation related configuration.
[0041] Aspects of the present disclosure are described in the context of a wireless communications system.
[0042] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NE 102, one or more UE 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0043] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN) , a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
[0044] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) . In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102. In some embodiments, the NEs 102 may include one or more relay nodes, integrated access and backhaul (IAB) nodes or wireless access backhaul (WAB) nodes which can provide wireless access services for UEs 104. A relay node (or an IAB node or a WAB node) can directly connect to a BS or hop through one or more relay nodes (or one or more IAB or WAB nodes) before reaching the BS.
[0045] The one or more UE 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
[0046] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0047] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N3, or network interface) . In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other or indirectly (e.g., via the CN 106. In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0048] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.
[0049] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N3, or another network interface) . The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106) .
[0050] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0051] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0052] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0053] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0054] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0055] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0056] To reduce UE reconfiguration complexity and overhead, predefined and / or configured reference configurations may be provided for UE. Persons skilled in the art would understand that all reference configuration (s) existing at a UE may be predefined or default, or configured by the network side, or part of them are predefined or default and part of them are configured. Considering that the UE and the network side have the same understanding on the default reference configurations, herein, application of configured reference configurations are mainly considered.
[0057] In accordance with some aspects of the present disclosure, a NE or RAN node (hereinafter, a first NE or first RAN node or the like) , e.g., a gNB may send a set of (one or more) configured reference configurations to the UE in RRC connected state, e.g., RRC active state. When a NE or RAN node, e.g., the first NE or a NE different from the first NE due to UE mobility (hereinafter, the second NE or second RAN node or the like) determines to send the UE to a RRC unconnected state, e.g., RRC inactive state or RRC idle state from the RRC connected state, for each configured reference configuration, the NE may also determine whether the UE will keep or release the configured reference configuration and indicate to the UE whether to keep or release the configured reference configuration. At the UE side, for a configured reference configuration, when the UE receives the information indicating to keep the configured reference configuration, the UE may keep the configured reference configuration, and when the UE receives the information indicating to release the configured reference configuration, the UE may release the configured reference configuration. Accordingly, when UE enters RRC connected state from the RRC inactive state or RRC idle state again (including the case that a radio link failure (RLF) occurs) , the UE and the network side, e.g., the RAN side may align the available reference configuration.
[0058] In the case that the NE or RAN node to which the UE is connected when enters the RRC connected state again is the same as that sent the UE to the RRC unconnected state, e.g., RRC inactive state or RRC idle state, the NE may still store the information related to the configured reference configuration maintained at the UE and there is no need to transfer or retrieve the configured reference configuration maintained at the UE.
[0059] However, in some scenarios of RRC state transition, the NE or RAN node, e.g., the first NE which sent the UE to RRC unconnected state (e.g., RRC inactive state or idle state) and indicated the UE to maintain part or all of the existing configured reference configurations may be different from the NE or RAN node, e.g., the second NE to which the UE is connected when transitioning to the RRC connected state, e.g., RRC active state again. To align the available reference configurations at the UE and RAN side, the second NE needs to know the configured reference configuration (s) maintained at the UE. A similar issue also occurs when the UE is handed over between different RANs (inter-RAN handover, e.g., inter-gNB handover) , e.g., from the first NE to the second NE.
[0060] In accordance with aspects of the present disclosure, there are various manners to support the second NE to obtain the information related to the configured reference configurations maintained or stored at the UE.
[0061] For example, in accordance with some aspects of the present disclosure (hereinafter, scheme 1 for simplification and clarity) , the second NE may receive the configured reference configurations maintained at the UE from the first NE if a RRC state transition or inter-RAN handover occurs.
[0062] In an exemplary scenario under scheme 1, when the first NE sends the UE to the RRC inactive or RRC idle state, the first NE may also configure or indicate the UE to keep part or all of the configured reference configurations. The first NE may also store the configured reference configuration which is indicated to be kept in the UE. If the UE enters RRC connected state again and connects to a new NE, e.g., the second NE, the second NE will obtain the information related to the configured reference configurations maintained at the UE from the first NE, e.g., via a UE context retrieve procedure over a network interface (e.g., Xn or the like) between the first NE and the second NE.
[0063] In another exemplary scenario under scheme 1, when the first NE hands over the UE to the second NE, the first NE may include the information related to the existing configured reference configurations at the UE in an Xn or the like interface message, e.g., a handover request message or the like. The second NE may determine whether the UE to keep or release the configured reference configurations at the UE. For example, when the second NE provides the configuration related to UE operations (e.g., radio protocol layer operations) after handover, if the second NE determines that the UE needs to release part or all of the existing configured reference configurations, the second NE may indicate the UE (e.g., with an explicit indicator) to release the part or all of the existing configured reference configurations in the corresponding Xn or the like interface message, e.g., a handover request acknowledge message or the like.
[0064] In accordance with some other aspects of the present disclosure (hereinafter, scheme 2 for simplification and clarity) , the second NE may receive the configured reference configurations maintained at UE from the UE, e.g., during or after establishing a connection with the UE.
[0065] In an exemplary scenario under scheme 2, when the first NE sends the UE to the RRC inactive or RRC idle state, the first NE may also configure or indicate the UE to keep part or all of the existing configured reference configurations. If the UE enters RRC connected state again and connects to a new NE, e.g., the second NE, the UE may indicate the information related to the configured reference configuration maintained at UE to the second NE, e.g., over air interface via RRC message or the like during or after establishing a connection with the second NE.
[0066] In accordance with some yet other aspects of the present disclosure (hereinafter, scheme 3 for simplification and clarity) , the second NE may receive the configured reference configurations maintained at the UE from the CN side, e.g., the AMF or the like.
[0067] In an exemplary scenario under scheme 3, when the first NE sends the UE to the RRC idle state, the first NE may also configure or indicate the UE to keep part or all of the existing configured reference configurations. In addition, the first NE may transmit the information related to the configured reference configurations at the UE to the CN, e.g., to the AMF or the like before or in response to sending the UE to the RRC idle state. If the UE enters RRC connected state again and connects to a new NE, e.g., the second NE, the second NE may receive information related to the configured reference configuration at UE from the CN, e.g., from the AMF or the like. If the reference configuration is configured by the CN, it may be unnecessary to indicate the related reference configuration to the CN by the first NE.
[0068] Some detailed implementations in accordance with various aspects of the present disclosure are illustrated below respectively in view of schemes 1-3.
[0069] Persons skilled in the art would understand that UE may frequently suffer RRC state transitions and handovers due to the mobility, and the first NE or RAN node and the second NE or RAN node can be a NE or RAN node or the like during any RRC state transition or handover as illustrated herein. In some scenarios, RLF may occur when UE is in RRC connected state, which is also covered by the present disclosure. The first NE may also be referred to as an old NE or last serving NE or source NE or an old RAN node or last serving RAN node or source RAN node etc. The second NE may also be referred to as a new NE or serving NE or target NE or a new RAN node or serving RAN node or target RAN node etc.
[0070] In addition, although the detailed implementations of the present disclosure are illustrated mainly in view of the UE side, persons skilled in the art would clearly determine the corresponding operations on the network side considering the consistency between UE side and network side.
[0071] Figure 2 illustrates an exemplary procedure of configuring UE in accordance with aspects of the present disclosure, where scheme 1 or scheme 2 may be applied.
[0072] Referring to Figure 2, at step 201, UE may be configured with a set of reference configurations by network side (that is, the set of reference configurations are configured reference configurations) , which are received from a first NE or RAN node acting as the serving RAN node, e.g., gNB#1 over CP or UP. The UE may receive the set of reference configurations via RRC message (s) , synchronization signal (SS) / PBCH block (SSB) message (s) , NAS message (s) conveyed in RRC signaling or PDU session (s) (e.g., UP based rather than RRC signaling based) etc. In some scenarios, part or all of the set of reference configurations may be transparent for the first RAN node. Each reference configuration may be associated with an index or identifier, e.g., configuration#1 or #2 etc. Different reference configurations of the set of reference configurations may be configured by the same apparatus or different apparatuses with the same or different manners.
[0073] In the case that a reference configuration received at the UE is configured or generated by RAN side, e.g., a first RAN node, gNB#1, it may be updated or reconfigured by the same RAN node or another RAN node, e.g., second RAN node, e.g., gNB#2 to which the UE is connected after being disconnected with the first RAN node. The UE may receive the reference configuration generated by the RAN via a RRC message or the like, e.g., RRC reconfiguration message or the like.
[0074] In the case that a reference configuration received at the UE is configured or generated by the OAM (not shown) , it may be updated or reconfigured by the OAM and is expected to be the same within the same public land mobile network (PLMN) . UE may receive the configured reference configuration from the OAM, e.g., via PDU session over UP via the first RAN node. RAN nodes within the same PLMN can be aware of the OAM configured reference configuration via the interface between the OAM and RAN nodes.
[0075] In the case that a reference configuration received at the UE is configured or generated by the CN side or CN entity (not shown) , e.g., the AMF or the like, it may be updated or reconfigured by the CN side, e.g., the AMF or the like. UE may receive the configured reference configuration from the CN side via NAS messages either carried in RRC messages over CP or over UP PDU session. The serving RAN node of UE, e.g., the first RAN node may be aware of the reference configuration configured to the UE in various manners. For example, the CN entity may inform the first RAN node of the CN configured reference configuration via the interface between the CN entity and the first RAN node, or the UE may inform the first RAN node of the CN configured reference configuration via a UL RRC message (not shown in the figure) .
[0076] Besides the parameters of each configured reference configuration, the UE may also receive some other information associated with the set of reference configurations.
[0077] For example, in some implementations of the present disclosure, for a configured reference configuration, the UE may also receive information indicating the type of the configured reference configuration (e.g., where the configuration is generated or which entity generates the configuration or the like) . For example, for a reference configuration configured or generated by RAN side, e.g., gNB#1, UE may receive information indicating that the reference configuration is RAN generated or gNB#1 generated. For a reference configuration configured or generated by OAM, UE may receive information indicating that the reference configuration is OAM generated and is expected to remain the same within the same PLMN unless reconfigured. For a reference configuration configured or generated by CN side, e.g., the AMF or the like, UE may receive information indicating that the reference configuration is CN generated or AMF generated or the like.
[0078] In some implementations of the present disclosure, for a configured reference configuration, the UE may also receive information indicating whether the configured reference configuration will be kept or released in the case that the UE transitions into a RRC unconnected state, e.g., RRC idle state or RRC inactive state from a RRC connected state, e.g., RRC active state. For example, when receiving a reference configuration, the UE may also receive information indicates that the reference configuration will be kept when the UE transitions into RRC idle state or RRC inactive state from RRC connected state or RRC reestablishment is triggered. In some cases, if the information indicates that a configured reference configuration will be kept when enters RRC unconnected state, it may also indicate how long the configured reference configuration will be kept.
[0079] In some implementations of the present disclosure, for a configured reference configuration, the UE may also receive information for identifying a servicing cell or RAN of the UE where the reference configuration is configured (e.g., the information that can be used to identify the serving cell or RAN where the reference configuration is configured) , e.g., by an inactive-radio network temporary identifier (I-RNTI) etc.
[0080] In some implementations of the present disclosure, for a configured reference configuration, the UE may also receive information indicating an area or a list of cells where the first configuration can be applied, e.g., area#1, or Cell#1, Cell#3 and Cell#4 etc.
[0081] The aforementioned information associated with the configured reference configurations may be separately used or in any combination in various implementations of the present disclosure. For example, gNB#1 may explicitly indicate to the UE that the UE should release all of the existing configured reference configurations when the UE enters RRC inactive state or RRC idle state or RRC reestablishment is triggered by an indicator indicating the UE to release all configured reference configurations. In addition, gNB#1 may further send to the UE the information that can be used to identify the serving cell or RAN where the reference configuration is configured.
[0082] Besides the configured reference configurations, there may be one or multiple default reference configurations specified and supported by the UE by default in some cases.
[0083] Based on a configured or predefined reference configuration, the first RAN node, e.g., gNB#1 may determine a complete configuration used for radio protocol layer operations, e.g., a configuration in use.
[0084] In some scenarios, reference configurations can be used for e.g., including but not limited to LTM, or handover (e.g., intra-RAN handover) , or conditional handover (e.g., conditional intra-RAN handover) or SCPAC etc., and part or all of the existing reference configurations (configured or default) may be updated or regenerated by the corresponding entity, which is the same as or similar to that illustrated at step 201. Accordingly, at step 203, the UE may receive one or multiple updated configurations (or new configurations or the like) to update the current configuration in use, which may be related to operations in any radio protocol layer or some specific radio protocol layer. There are various types of updated configuration.
[0085] For example, an exemplary updated configuration may be an updated complete configuration that will be used for radio protocol layer operations, which is self-contained and not related to any reference configuration. After receiving the updated complete configuration, UE may directly apply or use the updated complete configuration for UE operations as an updated configuration in use.
[0086] Another exemplary updated configuration may be a delta configuration compared with or based on a predefined reference configuration, e.g., configuration#A. The UE may also receive the information related to the predefined reference configuration, e.g., the index or identifier of configuration#A. UE may apply the delta configuration on top of or based on the related default reference configuration to form a complete configuration for UE operations as an updated configuration in use.
[0087] Yet another exemplary updated configuration may be a delta configuration compared with or based on a configured reference configuration, e.g., configuration#1. UE may also receive the information related to the configured reference configuration, e.g., the index or identifier of configuration#1. UE may apply the delta configuration on top of or based on the related configured reference configuration to form a complete configuration for UE operations as an updated configuration in use.
[0088] Further yet another exemplary updated configuration may be a delta configuration compared with or based on a currently used complete configuration or configuration in use at the UE. UE may apply the delta configuration on top of or based on the current configuration in use at the UE to determine or generate a new or updated configuration in use. In some cases, the current configuration in use at UE may be previously configured by the RAN, OAM or CN side using the same method described herein, e.g., by a complete configuration, or a delta configuration based on default or configured reference configuration etc. An updated configuration in use may be further used to determine a new updated configuration in use with another delta configuration.
[0089] In some cases, the UE may also receive information explicitly or implicitly indicating the type of the updated configuration at step 203. For example, when the first RAN node, e.g., gNB#1 configures the UE with an updated radio protocol layer operation related configuration, e.g., via a RRC message (e.g., RRC reconfiguration message or the like) , gNB#1 may explicitly or implicitly indicate the type of the updated reference configuration to be a complete configuration, or a delta configuration compared with a predefined or configured reference configuration or a delta configuration compared with a configuration in use.
[0090] In some scenarios, the first RAN node, e.g., gNB#1 may decide to send the UE to RRC inactive or idle state at step 205. The first RAN node may also decide whether the UE will keep or release the existing configured reference configurations, wherein different reference configurations may be associated with the same or different decisions. For the configured reference configurations that the first RAN node decides that the UE will keep, the first RAN node may also determine a time duration or how long the configured reference configurations will be kept and indicate it to the UE. If a configured reference configuration has been provided for or configured with the information related to whether the configured reference configuration will be kept or released in the case that the UE transitions into a RRC unconnected state, the first RAN node may rely on the provided or configured the information to make the decision. For the configured reference configurations that the first RAN node decides that the UE will keep, the first RAN node may also maintain them even after sending the UE to RRC inactive or idle state.
[0091] At step 207, when sending the UE to RRC inactive or idle state, e.g., via a RRC release message (may contain a suspend configuration if UE is sent to RRC inactive state) , the first RAN node may indicate to UE which configured reference configurations should be kept and / or which configured reference configurations should be released, which may be in explicit or implicit manners. In some cases, the first RAN node may also send to the UE the information for identifying the servicing cell or RAN of the UE where the reference configuration is configured.
[0092] For example, in some implementations of the present disclosure, when sending the UE to RRC inactive or idle state, the first RAN node may explicitly indicate to UE the configured reference configurations that should be kept after entering RRC unconnected state and the configured reference configurations that should be released after entering RRC unconnected state.
[0093] In some implementations of the present disclosure, the first RAN node may send an indicator to the UE when sending the UE to RRC inactive or idle state, indicating UE to release all configured reference configurations or keep all configured reference configurations after entering RRC unconnected state.
[0094] In some implementations of the present disclosure, the RAN node may only indicate the configured reference configurations to be kept after UE enters RRC unconnected state. If no explicit information indicating keeping part or all of the existing configured reference configurations, as a default behavior, UE is expected to release the existing configured reference configurations after entering RRC unconnected state. Alternatively, the RAN node may only indicate the configured reference configurations to be released after UE enters RRC unconnected state. If no explicit information indicating releasing part or all of the existing configured reference configurations, as a default behavior, UE is expected to keep the existing configured reference configurations after entering RRC unconnected state.
[0095] In some implementations of the present disclosure, e.g., in the case that the information indicating whether the configured configuration will be kept or released in the case that the UE transitions into RRC idle state or RRC inactive state from RRC connected state has been provided for each existing configured reference configuration at UE, e.g., at step 201, the RAN node may not send to UE the information related to whether the existing configured configuration will be kept or released after enters RRC inactive or idle state.
[0096] When entering RRC unconnected state, e.g., RRC inactive or idle state at step 209, UE may keep and / or release the existing configured reference configurations as the first RAN node indicates or as originally configured.
[0097] Herein, it is assumed that at least one configured reference configuration is kept or stored at the UE, which is also kept and stored at the first RAN node. It is also assumed that UE may attempt to enter RRC connected state again by sending an RRC message to the second RAN node, e.g., gNB#2 at step 211, which may be a RRC setup request message (e.g., in the case that UE is in RRC idle state) or RRC resume request message (e.g., in the case that UE is in RRC inactive state) or a RRC reestablishment request (e.g., in the case that a RLF occurs) . The UE may further indicate to the second RAN node the information for identifying a servicing cell or RAN of the UE where the first configuration is configured, e.g., I-RNTI.
[0098] The second RAN node may identify the last serving RAN node of the UE, e.g., the first RAN based on the information provided by the UE, and trigger an Xn interface procedure or the like to retrieve UE context, e.g., by sending a UE context retrieve request message or the like at step 213. At step 215, the first RAN node may send a corresponding Xn interface message or the like, e.g., a UE context retrieve response message or the like, providing the UE context for the second RAN node.
[0099] In accordance with scheme 1, the first RAN node may also indicate to the second RAN node the information related to the configured reference configuration kept at the UE at step 215, e.g., in the UE context retrieve response message or the like. The information related to the configured reference configuration kept at the UE may indicate the full reference configuration with detailed configuration parameters. In some cases, e.g., the reference configuration is an OAM or CN entity configured reference configuration and it is assumed that all RAN nodes managed by the same OAM or CN entity share the same understanding of the reference configuration configured by OAM or CN entity and represented by the same ID or index, the information related to the configured reference configuration kept at the UE may indicate the ID or index of the OAM or CN entity configured reference configuration without providing the detailed configuration parameters.
[0100] If the second RAN node accepts the UE entering RRC connected state, at step 217, the second RAN node may send a relevant DL RRC message in response to the RRC request received at step 211, e.g., a RRC setup message in response to a RRC setup request, a RRC resume message in response to a RRC resume request, or a RRC reestablishment message in response to a RRC reestablishment request. Accordingly, at step 219, the UE may send a RRC message to acknowledge that the RRC connection between the UE and the second RAN node is completed, e.g., by a RRC setup complete message corresponding to the RRC setup message, a RRC resume complete message corresponding to the RRC resume message, or a RRC reestablishment complete message corresponding to the RRC reestablishment message.
[0101] Regarding the configured reference configurations maintained at the UE, the second RAN node may also determine whether to update or keep or release part or all of them. For example, if the second RAN node decides that the UE needs to keep or release one or multiple configured reference configurations, the second RAN node may indicate to the UE in the same or similar manner as the first RAN node at step 207, e.g., by an explicit indicator to the UE indicating releasing all existing configured reference configurations at UE (may consider whether into the RRC unconnected state or not) . The information indicating keeping and / or releasing configured reference configurations may be included in the same message sent at step 217, or by a separate message, e.g., RRC reconfiguration message at step 219 after establishing the connection with the UE. The manners of updating the configuration in use in the UE is identical to that illustrated at step 203, and will not repeat.
[0102] Similar to the first RAN node performed at step 201, at step 211, the second RAN node may further configure or reconfigure the UE. Thus, in the case of the second RAN node as the serving RAN node, the configured reference configurations at the UE may also include those received from the first RAN node. In fact, the same or similar cases may also occur at the time that the first RAN node acts as the serving RAN node at step 201, the UE may also have reference configurations received from other RAN nodes, e.g., a last serving or source or old NE compared with the first NE due to last RRC state transition or inter-RAN handover etc., which will be handled in the same or similar way as other reference configurations received via the first RAN node, e.g., at step 201 or updated at step 203.
[0103] If scheme 2 is applied, in accordance with some aspects of the present disclosure, the second RAN node may receive from the UE the information related to the configured reference configuration at UE over air interface via a RRC message at step 211 or via a RRC message at step 219, rather than from the first RAN node via an Xn interface message or the like at step 215. Other details are the same or similar to those illustrated in view of scheme 1, and will not repeat.
[0104] In some scenarios under scheme 1, an inter-RAN handover, rather than RRC state transition may occur as illustrated in Figure 3, which illustrates another exemplary procedure of configuring UE under scheme 1 in accordance with aspects of the present disclosure.
[0105] Referring Figure 3, step 301 and step 303 are identical or similar to step 201 and step 203, and thus will not repeat.
[0106] It is assumed that the first RAN node, e.g., gNB#1 may determine to hand over the UE to the second RAN node, e.g., gNB#2. For example, at step 305, the first RAN node may trigger a handover procedure by sending to the second RAN node an Xn interface message or the like, e.g., a handover request or the like. The second RAN node may send a corresponding Xn interface message or the like, e.g., a handover request acknowledge message or the like to the first RAN node at step 307, including a RRC reconfiguration message or the like to the UE, which will be transparently sent to the UE by the second RAN node at step 309.
[0107] In accordance with scheme 1, to reduce UE reconfiguration complexity and overhead, the first RAN node may also indicate the information related to the existing configured reference configurations at UE at step 305, which may be the full reference configuration with detailed configuration parameters or not as illustrated in view of Figure 2 and thus will not repeat.
[0108] Regarding the existing configured reference configurations at the UE, the second RAN node may also determine whether to update or keep or release part or all of them, e.g., during the handover procedure, e.g., at step 307 and 309 or after the handover procedure, e.g., at step 311 after step 309. For example, when the second RAN node provides the configuration related to UE operation after handover for UE at step 307, the second RAN node may also indicate the UE to release one or multiple existing configured reference configurations, e.g., by an explicit indicator. For another example, after the RRC connection establishment between the UE and the second RAN node is completed, at step 311, the second RAN node may send to the UE the information related to updating, or keeping or releasing one or multiple configured reference configurations (even if some configured reference configurations have been updated or released at step 307 and 309) .
[0109] Similarly, the second RAN node may further configure or reconfigure the UE as illustrated in view of Figure 2 and will not repeat.
[0110] Figure 4 illustrates an exemplary procedure of configuring UE under scheme 3 in accordance with aspects of the present disclosure. The messages between RAN (e.g., the first and second RAN node) and CN, e.g., the AMF or the like may be various, e.g., a stream control transmission protocol (SCTP) based message, e.g., NG or the like, or a hypertext transfer protocol (HTTP) protocol based message, e.g., service based interface (SBI) or the like.
[0111] Referring Figure 4, step 401, 403, 405, 407 and 409 are identical or similar to step 201, 203, 205, 207 and 209, and thus will not repeat. Different from schemes 1 and 2, for the reference configurations configured for the UE, the first RAN node, e.g., gNB#1 may also keep the CN side informed, which may be a CN entity of maintaining or storing UE context, e.g., an AMF or the like. The AMF or the like may store the informed reference configuration as a part of the UE context. In the case that the reference configuration is configured by the CN entity as the same as the one maintaining or storing UE context, e.g., the AMF or the like, the first RAN node may not inform the CN entity of the reference configuration configured for the UE.
[0112] There are various opportunities that the first RAN node informs the configured reference configuration to the CN side. For example, in some implementations of the present disclosure, when or after sending the configured reference configuration to the UE at step 401 (or receiving the configured reference configuration from the UE) , the first RAN node may indicate the information related to the configured reference configurations to the corresponding CN entity at step 401a. In some implementations of the present disclosure, when or after sending the updated configuration to the UE at step 403 (or receiving the updated reference configuration from the UE) , the first RAN node may indicate the information related to the updated configurations to the corresponding CN entity at step 403a. In some implementations of the present disclosure, when the first RAN node sends a UE context release message to the CN entity in response to sending the UE to a RRC idle state (e.g., by a RRC release message) at step 407, the first RAN node may indicate the information related to the configured reference configurations to the corresponding CN entity at step 407a. Accordingly, even if the UE context is released at the first RAN node, the configured reference configurations at the UE will still be stored at the CN entity, e.g., the AMF or the like.
[0113] In some cases, if the first RAN node has informed the configured reference configurations before step 407a, in the UE context release message at step 407a, the first RAN node may indicate the configured reference configurations kept at the UE, so that the CN entity may correspondingly update the UE context. If it is default that UE will keep all configured reference configurations when entering RRC idle state, then the first RAN node may not inform the kept configured reference configurations.
[0114] In some cases, the first RAN node may still store the configured reference configurations kept at the UE, e.g., for a time duration, so that if the UE is still connected to the first RAN node when returns RRC connected state, the first RAN node may directly apply the configured reference configurations.
[0115] Similarly, it is assumed that at least one configured reference configuration is kept or stored at the UE. It is also assumed that UE may enter RRC connected state again and connect with the second RAN node, e.g., gNB#2 by a RRC setup procedure at step 411. Then, at step 413, the second RAN node may send an initial UE message to the CN side, e.g., the AMF or the like that stores the UE context. The AMF or the like may provide the UE context for the second RAN node at step 415, which may include the configured reference configurations kept at the UE side.
[0116] Regarding the existing configured reference configurations at the UE, the second RAN node may also determine whether to update or keep or release part or all of them as illustrated in view of Figure 2. For example, at step 417, the second RAN node may indicate the UE to release one or multiple existing configured reference configurations, e.g., by an explicit indicator or not. Similarly, the second RAN node may further configure or reconfigure the UE as illustrated in view of Figure 2 and will not repeat.
[0117] Figure 5 illustrates an example of a UE 500 in accordance with aspects of the present disclosure. The UE 500 may include a processor 502, a memory 504, a controller 506, and a transceiver 508. The processor 502, the memory 504, the controller 506, or the transceiver 508, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0118] The processor 502, the memory 504, the controller 506, or the transceiver 508, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0119] The processor 502 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 502 may be configured to operate the memory 504. In some other implementations, the memory 504 may be integrated into the processor 502. The processor 502 may be configured to execute computer-readable instructions stored in the memory 504 to cause the UE 500 to perform various functions of the present disclosure.
[0120] The memory 504 may include volatile or non-volatile memory. The memory 504 may store computer-readable, computer-executable code including instructions when executed by the processor 502 cause the UE 500 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 504 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0121] In some implementations, the processor 502 and the memory 504 coupled with the processor 502 may be configured to cause the UE 500 to perform one or more of the functions described herein (e.g., executing, by the processor 502, instructions stored in the memory 504) . For example, the processor 502 may support wireless communication at the UE 500 in accordance with examples as disclosed herein. The UE 500 may be configured to support a means for receiving, from a first NE, a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; means for receiving, from the first NE or a second NE, information indicating whether to keep or release the first configuration; and means for keeping or releasing the first configuration based on the information indicating whether to keep or release the first configuration.
[0122] The controller 506 may manage input and output signals for the UE 500. The controller 506 may also manage peripherals not integrated into the UE 500. In some implementations, the controller 506 may utilize an operating system such as or other operating systems. In some implementations, the controller 506 may be implemented as part of the processor 502.
[0123] In some implementations, the UE 500 may include at least one transceiver 508. In some other implementations, the UE 500 may have more than one transceiver 508. The transceiver 508 may represent a wireless transceiver. The transceiver 508 may include one or more receiver chains 510, one or more transmitter chains 512, or a combination thereof.
[0124] A receiver chain 510 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 510 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 510 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 510 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 510 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0125] A transmitter chain 512 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 512 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 512 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 512 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0126] Figure 6 illustrates an example of a processor 600 in accordance with aspects of the present disclosure. The processor 600 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 600 may include a controller 602 configured to perform various operations in accordance with examples as described herein. The processor 600 may optionally include at least one memory 604, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 600 may optionally include one or more arithmetic-logic units (ALUs) 606. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0127] The processor 600 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 600) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0128] The controller 602 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein. For example, the controller 602 may operate as a control unit of the processor 600, generating control signals that manage the operation of various components of the processor 600. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0129] The controller 602 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 604 and determine subsequent instruction (s) to be executed to cause the processor 600 to support various operations in accordance with examples as described herein. The controller 602 may be configured to track memory address of instructions associated with the memory 604. The controller 602 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 602 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 602 may be configured to manage flow of data within the processor 600. The controller 602 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 600.
[0130] The memory 604 may include one or more caches (e.g., memory local to or included in the processor 600 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 604 may reside within or on a processor chipset (e.g., local to the processor 600) . In some other implementations, the memory 604 may reside external to the processor chipset (e.g., remote to the processor 600) .
[0131] The memory 604 may store computer-readable, computer-executable code including instructions that, when executed by the processor 600, cause the processor 600 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 602 and / or the processor 600 may be configured to execute computer-readable instructions stored in the memory 604 to cause the processor 600 to perform various functions. For example, the processor 600 and / or the controller 602 may be coupled with or to the memory 604, the processor 600, the controller 602, and the memory 604 may be configured to perform various functions described herein. In some examples, the processor 600 may include multiple processors and the memory 604 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0132] The one or more ALUs 606 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 606 may reside within or on a processor chipset (e.g., the processor 600) . In some other implementations, the one or more ALUs 606 may reside external to the processor chipset (e.g., the processor 600) . One or more ALUs 606 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 606 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 606 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 606 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 606 to handle conditional operations, comparisons, and bitwise operations.
[0133] The processor 600 may support wireless communication in accordance with examples as disclosed herein. The processor 600 may be configured to or operable to support a means for receiving, from a first NE, a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; means for receiving, from the first NE or a second NE, information indicating whether to keep or release the first configuration; and means for keeping or releasing the first configuration based on the information indicating whether to keep or release the first configuration.
[0134] Figure 7 illustrates an example of a NE 700 in accordance with aspects of the present disclosure. The NE 700 may include a processor 702, a memory 704, a controller 706, and a transceiver 708. The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0135] The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0136] The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 702 may be configured to operate the memory 704. In some other implementations, the memory 704 may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in the memory 704 to cause the NE 700 to perform various functions of the present disclosure.
[0137] The memory 704 may include volatile or non-volatile memory. The memory 704 may store computer-readable, computer-executable code including instructions when executed by the processor 702 cause the NE 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 704 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0138] In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to cause the NE 700 to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) . For example, the processor 702 may support wireless communication at the NE 700 in accordance with examples as disclosed herein. The NE 700, e.g., act as the first NE may be configured to support a means for sending, to a UE, a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by the UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; and means for determining whether the UE will keep or release the first configuration in the case of determining to send the UE to a RRC inactive state or RRC idle state from a RRC connected state. The NE 700, e.g., act as the second NE may be configured to support a means for receiving a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state; means for determining whether the UE will keep or release the first configuration; and means for sending to the UE information indicating whether to keep or release the first configuration based on a result of determining whether the UE will keep or release the first configuration.
[0139] The controller 706 may manage input and output signals for the NE 700. The controller 706 may also manage peripherals not integrated into the NE 700. In some implementations, the controller 706 may utilize an operating system such as or other operating systems. In some implementations, the controller 706 may be implemented as part of the processor 702.
[0140] In some implementations, the NE 700 may include at least one transceiver 708. In some other implementations, the NE 700 may have more than one transceiver 708. The transceiver 708 may represent a wireless transceiver. The transceiver 708 may include one or more receiver chains 710, one or more transmitter chains 712, or a combination thereof.
[0141] A receiver chain 710 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 710 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 710 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 710 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 710 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0142] A transmitter chain 712 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 712 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 712 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 712 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0143] Figure 8 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions.
[0144] At step 801, the method may include receiving, from a first NE, a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state. The operations of step 801 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 801 may be performed by a UE as described with reference to Figure 5.
[0145] At step 803, the method may include receiving, from the first NE or a second NE, information indicating whether to keep or release the first configuration. The operations of step 803 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 803 may be performed by a UE as described with reference to Figure 5.
[0146] At step 805, the method may include keeping or releasing the first configuration based on the information indicating whether to keep or release the first configuration. The operations of step 805 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 805 may be performed by a UE as described with reference to Figure 5.
[0147] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0148] Figure 9 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a NE as described herein, e.g., a first NE. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions.
[0149] At step 901, the method may include sending, to a UE, a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by the UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state. The operations of step 901 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 901 may be performed by a NE as described with reference to Figure 7.
[0150] At step 903, the method may include determining whether the UE will keep or release the first configuration in the case of determining to send the UE to a RRC inactive state or RRC idle state from a RRC connected state. The operations of step 903 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 903 may be performed by a NE as described with reference to Figure 7.
[0151] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0152] Figure 10 illustrates another flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a NE as described herein, e.g., a second NE. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions.
[0153] At step 1001, the method may include receiving a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by a UE in RRC connected state and can be maintained when the UE is in RRC inactive or RRC idle state. The operations of step 901 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 1001 may be performed by a NE as described with reference to Figure 7.
[0154] At step 1003, the method may include determining whether the UE will keep or release the first configuration. The operations of step 1003 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 1003 may be performed by a NE as described with reference to Figure 7.
[0155] At step 1005, the method may include sending to the UE information indicating whether to keep or release the first configuration based on a result of determining whether the UE will keep or release the first configuration. The operations of step 1005 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of step 1005 may be performed by a NE as described with reference to Figure 7.
[0156] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0157] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the UE to:receive, from a first network equipment (NE) , a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by the UE in radio resource control (RRC) connected state and can be maintained when the UE is in RRC inactive or RRC idle state;receive, from the first NE or a second NE, information indicating whether to keep or release the first configuration; andkeep or release the first configuration based on the information indicating whether to keep or release the first configuration.2.The UE of claim 1, wherein the radio protocol layer operations comprise one or multiple of: physical (PHY) layer operations, media access control (MAC) layer operations, radio link control (RLC) layer operations, RRC layer operations, service data adaptation protocol (SDAP) layer operations or packet data convergence protocol (PDCP) layer operations.3.The UE of claim 1, wherein the at least one processor is configured to cause the UE to:receive, from the first NE, a set of first configurations including the first configuration, wherein each first configuration is generated by radio access network (RAN) side, operations administration and maintenance (OAM) , or core network (CN) side.4.The UE of claim 3, wherein in the case that the first configuration is generated by the CN side and carried by a non-access stratum (NAS) message, the at least one processor is configured to further cause the UE to:indicate the first configuration to the first NE.5.The UE of claim 1, wherein the at least one processor is configured to further cause the UE to receive from the first NE one or multiple of:information indicating where the first configuration is generated;information indicating whether the first configuration will be kept or released in the case that the UE transitions into RRC idle state or RRC inactive state from RRC connected state;information for identifying a servicing cell or radio access network (RAN) of the UE where the first configuration is configured; orinformation indicating an area or a list of cells where the first configuration can be applied.6.The UE of claim 1, wherein the at least one processor is configured to further cause the UE to:determine a current configuration used for radio protocol layer operations based on the first configuration; andreceive an updated configuration to update the current configuration used for radio protocol layer operations, wherein the updated configuration is:an updated self-contained configuration that will be used for radio protocol layer operations;a delta configuration compared with the first configuration; ora delta configuration compared with the current configuration.7.The UE of claim 1, wherein there is at least one predefined first configuration default in the UE, and at least one processor is configured to further cause the UE to:determine a current configuration used for radio protocol layer operations based on a predefined first configuration; andreceive an updated configuration to update the current configuration used for radio protocol layer operations, wherein the updated configuration is:an updated self-contained configuration that will be used for radio protocol layer operations;a delta configuration compared with the predefined first configuration; ora delta configuration compared with the current configuration.8.The UE of claim 6 or 7, wherein the at least one processor is configured to further cause the UE to:receive information indicating a type of the updated configuration.9.The UE of claim 1, wherein the at least one processor is configured to further cause the UE to:receive, from the first NE, a message indicating to transition into the RRC inactive state or RRC idle state from the RRC connected state; andkeep the first configuration in the case of receiving information indicating to keep the first configuration in the message or before the message.10.The UE of claim 9, wherein in the case that the UE transitions from the RRC inactive state or RRC idle state to the RRC connected state and is connected to the second NE, the at least one processor is configured to further cause the UE to:indicate the first configuration to the second NE during or after establishing a connection with the second NE.11.The UE of claim 9, wherein the at least one processor is configured to further cause the UE to:release the first configuration in the case of receiving information indicating to release the first configuration from the second NE.12.The UE of claim 1, wherein in the case that the UE is handed over from the first NE to the second NE, the at least one processor is configured to further cause the UE to:release the first configuration in the case of receiving information indicating to release the first configuration from the second NE during or after receiving a handover command.13.The UE of claim 1, wherein in the case that the information indicating whether to keep or release the first configuration indicates to keep the first configuration, the message further indicates a time duration that the first configuration needs to be kept at the UE.14.A processor for wireless communication, comprising:at least one controller coupled with at least one memory and configured to cause the processor to:receive, from a first network equipment (NE) , a first configuration, wherein the first configuration is a basic configuration for radio protocol layer operations by a user equipment (UE) in radio resource control (RRC) connected state and can be maintained when the UE is in RRC inactive or RRC idle state;receive, from the first NE or a second NE, information indicating whether to keep or release the first configuration; andkeep or release the first configuration based on the information indicating whether to keep or release the first configuration.15.A network equipment (NE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the NE to:send, to a user equipment (UE) , a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by the UE in radio resource control (RRC) connected state and can be maintained when the UE is in RRC inactive or RRC idle state; anddetermine whether the UE will keep or release the first configuration in the case of determining to send the UE to a RRC inactive state or RRC idle state from a RRC connected state.16.The NE of claim 15, wherein in the case of determining to send the UE to the RRC inactive state or RRC idle state and that the UE will keep the first configuration, the at least one processor is configured to cause the NE to:maintain the first configuration after sending the UE to the RRC inactive state or RRC idle state; andindicate the first configuration to a different NE in the case that the UE transitions to a RRC connected state and is connected to the different NE.17.The NE of claim 15, wherein in the case of determining to handover the UE to a different NE and that the UE will keep the first configuration, the at least one processor is configured to cause the NE to:indicate the first configuration to the different NE in a handover request message.18.The NE of claim 15, wherein the at least one processor is configured to cause the NE to:indicate the first configuration to a core network (CN) side before or in response to sending the UE to the RRC inactive state or RRC idle state.19.A network equipment (NE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the NE to:receive a first configuration, wherein the first configurations is a basic configuration for radio protocol layer operations by a user equipment (UE) in radio resource control (RRC) connected state and can be maintained when the UE is in RRC inactive or RRC idle state;determine whether the UE will keep or release the first configuration; andsend to the UE information indicating whether to keep or release the first configuration based on a result of determining whether the UE will keep or release the first configuration.20.The NE of claim 19, wherein the first configuration is received from the UE, or a different NE last serving the UE or a core network (CN) side.
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