WO2024146185A1 - Ltm basé sur une condition - Google Patents

Ltm basé sur une condition Download PDF

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Publication number
WO2024146185A1
WO2024146185A1 PCT/CN2023/121627 CN2023121627W WO2024146185A1 WO 2024146185 A1 WO2024146185 A1 WO 2024146185A1 CN 2023121627 W CN2023121627 W CN 2023121627W WO 2024146185 A1 WO2024146185 A1 WO 2024146185A1
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WO
WIPO (PCT)
Prior art keywords
ltm
ran
candidate cell
condition
target
Prior art date
Application number
PCT/CN2023/121627
Other languages
English (en)
Inventor
Lianhai WU
Shuigen Yang
Congchi ZHANG
Original Assignee
Lenovo (Beijing) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lenovo (Beijing) Limited filed Critical Lenovo (Beijing) Limited
Priority to PCT/CN2023/121627 priority Critical patent/WO2024146185A1/fr
Publication of WO2024146185A1 publication Critical patent/WO2024146185A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the present disclosure relates to wireless communications, and more specifically to radio access network (RAN) units, methods, apparatuses, and computer readable medium for condition based layer 1/layer 2 triggered mobility (LTM) .
  • RAN radio access network
  • LTM condition based layer 1/layer 2 triggered mobility
  • a target RAN CU comprises at least one memory; and at least one processor coupled with the at least one memory and configured to cause the target RAN CU to: receive, from a RAN CU, a first request message indicates condition based LTM and an LTM candidate cell associated with the condition based LTM, wherein the condition based LTM will be performed based on an evaluation of conditions by a UE; transmit, to a target RAN DU, a second request message indicates the condition based LTM and the LTM candidate cell; receive, from the target RAN DU, a second response message comprising a second configuration associated with the LTM candidate cell; and transmit, to the RAN CU, a first response message comprising a first configuration for the LTM candidate cell, wherein the first configuration at least comprises the second configuration.
  • a method performed by the target RAN DU comprises: receiving, from a RAN CU or a target RAN CU, a second request message indicates condition based LTM and an LTM candidate cell associated with the condition based LTM, wherein the condition based LTM will be performed based on an evaluation of conditions by a UE; and transmitting, to the RAN CU or the target RAN CU, a second response message comprising second configuration associated with the LTM candidate cell.
  • a method performed by the UE comprises: receiving, from a RAN CU, a first configuration for an LTM candidate cell associated with condition based LTM and one or more corresponding conditions for triggering LTM; and in accordance with a determination that one of the one or more corresponding conditions is met, performing a switching to the LTM candidate cell.
  • a processor for wireless communication comprises at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a RAN CU or a target RAN CU, a second request message indicates condition based LTM and an LTM candidate cell associated with the condition based LTM, wherein the condition based LTM will be performed based on an evaluation of conditions by a UE; and transmit, to the RAN CU or the target RAN CU, a second response message comprising second configuration associated with the LTM candidate cell.
  • a processor for wireless communication comprises at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a RAN CU, a first configuration for an LTM candidate cell associated with condition based LTM and one or more corresponding conditions for triggering LTM; and in accordance with a determination that one of the one or more corresponding conditions is met, perform a switching to the LTM candidate cell.
  • the second request message further requests for a RACH resource for an early TA acquisition associated with the RAN CU, and wherein the second response message further indicates the RACH resource for an early TA acquisition associated with the RAN CU.
  • the first request message further comprises information of a RAN DU
  • the first request message further requests for a RACH resource for an early TA acquisition associated with the RAN DU
  • the second response message further indicates the RACH resource for an early TA acquisition associated with the RAN DU.
  • FIG. 2 illustrates a schematic diagram of an example communication network in which some embodiments of the present disclosure can be implemented
  • FIG. 5 illustrates a signalling chart illustrating communication process for determining RACH resource for early TA acquisition for inter-CU LTM in accordance with some example embodiments of the present disclosure
  • FIG. 7 illustrates an example of a processor that is suitable for implementing some embodiments of the present disclosure
  • FIG. 9 illustrates a flowchart of an example method implemented at a RAN CU in accordance with aspects of the present disclosure
  • FIG. 10 illustrates a flowchart of an example method implemented at a target RAN CU in accordance with aspects of the present disclosure
  • FIG. 11 illustrates a flowchart of an example method implemented at a target RAN DU in accordance with aspects of the present disclosure
  • FIG. 12 illustrates a flowchart of an example method implemented at a source RAN DU in accordance with aspects of the present disclosure.
  • FIG. 13 illustrates a flowchart of an example method implemented at a UE in accordance with aspects of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • FIG. 1 illustrates an example of a wireless communications system 100 in which some embodiments of the present disclosure can be implemented.
  • the wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as a long term evolution (LTE) network or an LTE-Advanced (LTE-A) network.
  • LTE long term evolution
  • LTE-A LTE-Advanced
  • the wireless communications system 100 may be a 5G network, such as a new radio (NR) network.
  • NR new radio
  • 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.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 The wireless communications system 100 may support radio access technologies beyond 5G. 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.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • a network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection.
  • a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • a network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, message, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112.
  • a network entity 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.
  • a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network.
  • different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102.
  • the one or more UEs 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 mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • 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.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be stationary in the wireless communications system 100.
  • a UE 104 may be mobile in the wireless communications system 100.
  • a UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link 114 may be referred to as a sidelink (SL) .
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) .
  • IAB integrated access backhaul
  • O-RAN open RAN
  • vRAN virtualized RAN
  • C-RAN cloud RAN
  • a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
  • CU central unit
  • DU distributed unit
  • RU radio unit
  • RIC RAN Intelligent Controller
  • RIC e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC)
  • SMO Service Management and Orchestration
  • Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU.
  • functions e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof
  • a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack.
  • a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack.
  • the DU may support one or multiple different cells (e.g., via one or more RUs) .
  • a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
  • the core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions.
  • the core network 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) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management functions
  • S-GW serving gateway
  • PDN gateway Packet Data Network gateway
  • UPF user plane function
  • the network entities 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) .
  • the network entities 102 and the UEs 104 may support different resource structures.
  • the network entities 102 and the UEs 104 may support different frame structures.
  • the network entities 102 and the UEs 104 may support a single frame structure.
  • Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) .
  • the number (e.g., quantity) of slots for a subframe may depend on a numerology.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • the UE accesses the serving gNB, and the UE reports L3 measurement results based on the configuration from the serving gNB. If the gNB (e.g. CU of gNB) decides to switch the UE to a candidate cell based on the measurement results, the serving gNB requests the target DU (s) to prepare the configuration for one or more than one candidate cell. After receiving the candidate cell configuration from target DU, the serving gNB transmits RRC reconfiguration message including one or more than one candidate cell to UE. For example, CU of the serving gNB transmits the RRC reconfiguration message to UE via source DU.
  • the gNB e.g. CU of gNB
  • the RAN CU 210 may be a base station, such as a gNB; or the RAN CU 210 may be considered as a CU of the base station (such as gNB) , and the RAN DUs 230 and 241 may be considered as DUs of the base station (such as gNB) .
  • the base station may serve multiple UEs which may include the UE 250 as shown in FIG. 2.
  • the UE may switch to the RAN DU 242, for example, the UE 250 may move to a location 252, in this case, the RAN CU 220 is a target CU and the RAN DU 242 is a target DU, and the mobility is an inter-CU (inter-gNB) mobility.
  • inter-gNB inter-CU
  • LTM Reference Configuration A configuration provided by the network to the UE that is common to all the configured LTM candidate cells. It is used by the UE to generate a complete LTM candidate cell configuration (i.e., by applying an LTM candidate cell configuration on top of an LTM reference configuration) .
  • FIG. 3 illustrates a signalling chart illustrating communication process 300 for inter-CU condition based LTM in accordance with some example embodiments of the present disclosure.
  • the process 300 may involve the UE 250, the RAN DU (source DU) 230, the RAN CU (source CU) 210, the RAN CU (target CU) 220, and the RAN DU (target DU) 242, as show in FIG. 2. It would be appreciated that the process 300 may be applied to other communication scenarios, which will not be described in detail.
  • the source CU 210 transmits a first request message to the target CU 220 at 310.
  • the first request message may indicate condition based LTM and an LTM candidate cell associated with the condition based LTM.
  • the LTM candidate cell associated with the condition based LTM may be called as a candidate cell associated with the condition based LTM.
  • the LTM candidate cell or the candidate cell may be a target cell.
  • the first request message may further indicate whether at least one subsequent LTM is supported by condition based LTM.
  • the first request message may include information of subsequent LTM (s) , for example, the formation may indicate that the prepared LTM should support (or apply for) subsequent LTM (s) .
  • the target CU 220 transmits a second request message to the target DU 242 at 320.
  • the second request message may indicate condition based LTM and an LTM candidate cell.
  • condition based LTM For example, if the indication of condition based LTM is set to be condition LTM initiation, the target DU 242 which receives the second request message shall consider that the request concerns a conditional LTM for MCG or SCG associated with a candidate cell.
  • condition based LTM if the indication of condition based LTM is set to be condition LTM replace, the target DU 242 which receives the second request message shall replace the existing prepared conditional LTM identified by the UE ID (e.g., gNB-DU UE F1 application protocol (F1AP) ID) and the candidate cell ID.
  • UE ID e.g., gNB-DU UE F1 application protocol (F1AP) ID
  • F1AP application protocol
  • condition based LTM For example, if the indication of condition based LTM is set to be condition LTM cancel, the target DU 242 which receives the second request message shall consider that the RAN CU 220 is about to remove any reference to, and release any resources previously reserved for the candidate cells associated to the UE.
  • the second response message may include a second configuration associated with the LTM candidate cell.
  • the second configuration will be used by the UE 250 to access the LTM candidate cell (i.e. LTM target cell) .
  • the second configuration may also be called as an RRC configuration for the LTM candidate cell (i.e. LTM target cell) .
  • the first configuration may include the second configuration determined by the target DU 242 and a further configuration determined by the target CU 220.
  • the target CU 220 transmits a second request message to the target DU 242 at 530.
  • the second request message may
  • the processor 700 may support wireless communication in accordance with examples as disclosed herein.
  • the processor 700 may be configured to or operable to support a means for operations described in some embodiments of the present disclosure.
  • the method may include receiving, from a RAN CU, a first request message indicates condition based LTM and an LTM candidate cell associated with the condition based LTM, wherein the condition based LTM will be performed based on an evaluation of conditions by a UE.
  • the operations of 1010 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1010 may be performed by the RAN CU 220 as described with reference to FIG. 2.
  • the method may include transmitting, to a target RAN DU, a second request message indicates the condition based LTM and the LTM candidate cell.
  • the operations of 1020 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1020 may be performed by the RAN CU 220 as described with reference to FIG. 2.
  • the method may include receiving, from the target RAN DU, a second response message comprising a second configuration associated with the LTM candidate cell.
  • the operations of 1030 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1030 may be performed by the RAN CU 220 as described with reference to FIG. 2.
  • FIG. 12 illustrates a flowchart of a method 1200 performed by a RAN DU in accordance with aspects of the present disclosure.
  • the operations of the method 1200 may be implemented by a device or its components as described herein.
  • the operations of the method 1200 may be performed by the RAN DU 230 in FIG. 2.
  • the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

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

Abstract

Des modes de réalisation donnés à titre d'exemple de la présente divulgation concernent des unités RAN, des procédés, des appareils, et un support lisible par ordinateur pour un LTM basé sur une condition. Dans la solution, la CU RAN peut transmettre un premier message de demande à une CU RAN cible, le premier message de demande comprenant une indication de LTM basé sur une condition et une cellule candidate LTM. Ainsi, la CU RAN cible peut savoir que l'UE effectuera un LTM basé sur une condition, et par conséquent une DU RAN cible peut préparer une configuration, pour le LTM basé sur une condition, relative à la cellule candidate LTM. Par conséquent, une efficacité de commutation de l'UE peut être garantie.
PCT/CN2023/121627 2023-09-26 2023-09-26 Ltm basé sur une condition WO2024146185A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220022121A1 (en) * 2019-02-05 2022-01-20 Telefonaktiebolaget Lm Ericsson (Publ) Handling of Measurement Configuration Upon Conditional Mobility Execution
US20220191749A1 (en) * 2020-12-14 2022-06-16 Qualcomm Incorporated Layer 1 and layer 2 mobility in multiple distributed unit deployments
WO2022205034A1 (fr) * 2021-03-31 2022-10-06 Apple Inc. Mobilité inter-cellules basée sur l1 l2

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220022121A1 (en) * 2019-02-05 2022-01-20 Telefonaktiebolaget Lm Ericsson (Publ) Handling of Measurement Configuration Upon Conditional Mobility Execution
US20220191749A1 (en) * 2020-12-14 2022-06-16 Qualcomm Incorporated Layer 1 and layer 2 mobility in multiple distributed unit deployments
WO2022205034A1 (fr) * 2021-03-31 2022-10-06 Apple Inc. Mobilité inter-cellules basée sur l1 l2

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