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WO2023104287A1 - Rapport rlf permettant la mobilité l1/l2 - Google Patents

Rapport rlf permettant la mobilité l1/l2 Download PDF

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Publication number
WO2023104287A1
WO2023104287A1 PCT/EP2021/084487 EP2021084487W WO2023104287A1 WO 2023104287 A1 WO2023104287 A1 WO 2023104287A1 EP 2021084487 W EP2021084487 W EP 2021084487W WO 2023104287 A1 WO2023104287 A1 WO 2023104287A1
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WO
WIPO (PCT)
Prior art keywords
cell
terminal
identifier
layer
mobility
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2021/084487
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English (en)
Inventor
Guillaume DECARREAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
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 Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2021/084487 priority Critical patent/WO2023104287A1/fr
Priority to EP21830989.6A priority patent/EP4437758A1/fr
Publication of WO2023104287A1 publication Critical patent/WO2023104287A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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

Definitions

  • the present disclosure relates to L1/L2 mobility, in particular to reporting in case of L1/L2 mobility.
  • L1/L2 mobility is a new feature being studied in RAN WG.
  • the change of the serving cell of the UE is not triggered/managed by the gNB-Cll but by the gNB- Dll only if the gNB-Dll provides both the source cell and the target cell.
  • the gNB-Cll is not involved in the UE Mobility between the cells concerned by L1/L2 mobility.
  • the gNB-CU is not aware of the location of the UE (whether UE is in Cell 1 or in Cell 2 of gNB-DU).
  • the UE is configured for L1/L2 Mobility.
  • a HO is triggered by the gNB-DU without involvement of gNB-CU.
  • the UE performs mobility (Handover) but the gNB-CU is not informed about it because the radio link (i.e. the physical layer and the data link layer (MAC), Layers 1 and 2 of OSI model) are handled by the gNB-DU.
  • the radio link i.e. the physical layer and the data link layer (MAC), Layers 1 and 2 of OSI model
  • C-RNTI is a cell-specific identifier.
  • Fig. 1 shows a flowchart explaining a principle of L1/L2 mobility.
  • the messages are as follows:
  • the UE is connected to cell 1 of gNB-DU.
  • gNB-CU configures the UE for L1/L2 mobility (here (and in some further messages of Figs. 1 and 4) denoted as “L1 mobility” for simplicity).
  • gNB-CU configures the DU for L1/L2 mobility for the UE.
  • the UE being connected to cell 1 measures also cell 2 and reports the measurements to gNB DU.
  • gNB-DU Based on the reported measurements, gNB-DU decides to handover the UE from cell 1 to cell 2.
  • L1/L2 handover is different from (conventional) L3 handover because there is no L3 (RRC) message exchange.
  • RRC L3
  • gNB-CU triggers the handover by L3 RRCReconfiguration, and UE confirms by RRCReconfigurationComplete.
  • L3 messages are not used in L1/L2 handover.
  • the RLC and PDCP channels are kept, while in L3 handover, the RLC and PDCP channels are reset.
  • RLF Report When UE encounters a Radio Link failure, it creates a Report (RLF Report) which is delivered to the Network when UE is connected again.
  • This report contains information that helps the network to identify the cause and the failure. Thus, the network may potentially amend some parameters to avoid another occurrence of the RLF.
  • Fig. 2 shows an extract of 3GPP TS 38.331 specifying the RLF report
  • Fig. 3 shows a corresponding ASN.1 pseudocode.
  • the cell is identified by cell global identity (CGI) and, if available, tracking area code, or by physical cell identity and carrier frequency of the physical cell.
  • CGI cell global identity
  • a UE context is a block of information stored in a gNB associated to one active UE.
  • the block of information contains information required to maintain the E-UTRAN services towards the active UE.
  • At least one of (typically: all of) UE state information, security information, UE capability information and the identities of the UE-associated logical Si- connection may be included in the UE context.
  • a UE context is established when the transition to active state for a UE is completed or in target gNB after completion of handover resource allocation during handover preparation.
  • an apparatus comprising: one or more processors, and memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform: monitoring whether a terminal is configured for layer 1/layer 2 mobility while the terminal is being connected to a first cell and is being identified by a first cell-related terminal identifier, wherein the first cell-related terminal identifier is related to the first cell; storing an identifier of the first cell and the first cell-related terminal identifier if the terminal is configured for the layer 1 /layer 2 mobility while the terminal is being connected to the first cell and is being identified by the first cell-related terminal identifier; supervising whether the terminal experiences a radio link failure while the terminal is being connected to a second cell and is being identified by a second cell- related terminal identifier, wherein the second cell-related terminal identifier is related to the second cell, and the second cell is different from the first cell; providing a report on the radio link failure to a third cell if the terminal experiences the radio
  • an apparatus comprising: one or more processors, and memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform: receiving a report on a radio link failure experienced by a terminal, wherein the report comprises an identifier of a first cell and a first cell-related terminal identifier, the identifier of the first cell indicates that the terminal was configured for layer 1 /layer 2 mobility while the terminal was being connected to the first cell, and the first cell-related terminal identifier indicates that the terminal was being identified by the first cell-related terminal identifier when the terminal was configured for the layer 1/layer 2 mobility; retrieving a context of the terminal based on the identifier of the first cell and the first cell-related terminal identifier; inhibiting interpreting the identifier of the first cell and the first cell-related terminal identifier comprised in the report such that the identifier of the first cell and the first cell- related terminal identifier indicate that the terminal experienced the radio link failure when the terminal was being connected
  • a method comprising: monitoring whether a terminal is configured for layer 1/layer 2 mobility while the terminal is being connected to a first cell and is being identified by a first cell-related terminal identifier, wherein the first cell-related terminal identifier is related to the first cell; storing an identifier of the first cell and the first cell-related terminal identifier if the terminal is configured for the layer 1 /layer 2 mobility while the terminal is being connected to the first cell and is being identified by the first cell-related terminal identifier; supervising whether the terminal experiences a radio link failure while the terminal is being connected to a second cell and is being identified by a second cell- related terminal identifier, wherein the second cell-related terminal identifier is related to the second cell, and the second cell is different from the first cell; providing a report on the radio link failure to a third cell if the terminal experiences the radio link failure, wherein the report comprises the identifier of the first cell and the first cell-related terminal identifier.
  • a method comprising: receiving a report on a radio link failure experienced by a terminal, wherein the report comprises an identifier of a first cell and a first cell-related terminal identifier, the identifier of the first cell indicates that the terminal was configured for layer 1 /layer 2 mobility while the terminal was being connected to the first cell, and the first cell-related terminal identifier indicates that the terminal was being identified by the first cell-related terminal identifier when the terminal was configured for the layer 1/layer 2 mobility; retrieving a context of the terminal based on the identifier of the first cell and the first cell-related terminal identifier; inhibiting interpreting the identifier of the first cell and the first cell-related terminal identifier comprised in the report such that the identifier of the first cell and the first cell- related terminal identifier indicate that the terminal experienced the radio link failure when the terminal was being connected to the first cell and was being identified by the first cell- related terminal identifier.
  • Each of the methods of the third and fourth aspects may be a method of L1/L2 mobility.
  • a computer program product comprising a set of instructions which, when executed on an apparatus, is configured to cause the apparatus to carry out the method according to any of the third and fourth aspects.
  • the computer program product may be embodied as a computer-readable medium or directly loadable into a computer. According to some embodiments of the invention, at least one of the following advantages may be achieved:
  • Fig. 1 shows a flowchart explaining a principle of L1/L2 mobility
  • Fig. 2 shows an extract of 3GPP TS 38.331 ;
  • Fig. 3 shows ASN.1 pseudocode corresponding to Fig. 2;
  • Fig. 4 shows a message flow according to some example embodiments of the invention
  • Fig. 5 shows an apparatus according to an example embodiment of the invention
  • Fig. 6 shows a method according to an example embodiment of the invention
  • Fig. 7 shows an apparatus according to an example embodiment of the invention
  • Fig. 8 shows a method according to an example embodiment of the invention
  • Fig. 9 shows an apparatus according to an example embodiment of the invention.
  • C-RNTI may change during the L1/L2 Handover process from one cell to another cell.
  • the gNB-CU is not aware of the change of C-RNTI.
  • the network gNB-CU cannot retrieve the UE context stored in gNB-CU based on these indications (i.e. based on the identities of cell 2 and related C-RNTI of the UE).
  • the UE when UE experiences a RLF when being configured for L1/L2 mobility, the UE may indicate in the RLF Report:
  • the gNB- CU may store the UE context with the following attribute:
  • This cell and the corresponding C-RNTI may be different from the cell and the corresponding C-RNTI, respectively, to which the UE is connected after the UE performed a L1/L2 handover.
  • Fig. 4 shows a message flow chart according to some example embodiments of the invention.
  • the messages and actions are as follows:
  • gNB stores UE context with the reference:
  • gNB-CU configures the UE for L1/L2 mobility between cell 1 and cell 2 and (not shown in Fig. 4) instructs gNB-DU accordingly.
  • UE stores the ID of the cell (cell 1) it is connected to and its current C-RNTI when it is configured for L1/L2 mobility.
  • UE performs successfully L1/L2 mobility handover between cell 1 and cell 2.
  • UE gets a C-RNTI related to cell 2. Nevertheless, UE keeps the ID of cell 1 and the corresponding C-RNTI stored.
  • gNB-CU is not aware of the handover.
  • Cell 3 could be any cell including Cell 1 or Cell 2).
  • the RLF report is forwarded to the gNB-CU.
  • the gNB-CU can identify the UE and read the context of the UE when it receives the RLF report. The gNB-CU can then take action to correct the problem and/or inform a OSS on the RLF such that the OSS may take action.
  • C-RNTI UE ID
  • gNB-CU or OSS can identify the type of UE or the configuration of the UE. Thus, some actions may be taken even if the place of the RLF (here: cell 2) is not known. For example, gNB or OSS may evaluate if RLFs in L1/L2 mobility based handover take place often for a certain type of UEs. Then, this type of UEs may be excluded from L1/L2 mobility. In such a scenario, gNB-CU need not even to know the place of the RLF (action 7b in Fig. 4). Also, for such an analysis and corrective action, the cell (cell 1) where the UE was configured for L1/L2 mobility may be irrelevant.
  • the gNB-Cll gets information about the place of the RLF, too.
  • gNB-Cll or the OSS may take the appropriate correction measures in the cell (here: cell 2) because gNB-Cll knows where the RLF happened from UE point of view.
  • the information on the place of the RLF (7b in Fig. 4) and the reference to the UE context (7c in Fig. 4) may be reported in a single (common) report or in separate reports. In the latter case, the format of the conventional RLF report not comprising the reference to the UE context may be maintained.
  • the presence of the reference of the UE context may be considered as an implicit indication that the UE was configured for L1/L2 mobility.
  • the explicit indication (7a in Fig. 4) may be omitted.
  • the explicit indication may be omitted if both the place of the RLF and the reference of the UE context are reported (in a common report or in separate reports).
  • the UE checks if the cell ID and the C-RNTI at the time when it experiences a RLF are the same as the cell ID and C-RNTI at the time when it was configured for L1/L2 mobility. This may happen if the UE has not moved away from the cell (cell 1 of Fig. 4) or moved forth and back. In this case, the UE may report, in the RLF report, only one pair of cell ID and C-RNTI because the place of the RLF (7b of Fig. 4) and the reference of the UE context (7c of Fig. 4) are the same. Such a RLF report may or may not comprise an indication that the UE was configured for L1/L2 mobility (7a of Fig. 4).
  • gNB-CU may retrieve the UE context and use it when the UE attempts to re-establish the RRC connection.
  • Fig. 5 shows an apparatus according to an example embodiment of the invention.
  • the apparatus may be a terminal, such as a UE or an MTC device, or an element thereof.
  • Fig. 6 shows a method according to an example embodiment of the invention.
  • the apparatus according to Fig. 5 may perform the method of Fig. 6 but is not limited to this method.
  • the method of Fig. 6 may be performed by the apparatus of Fig. 5 but is not limited to being performed by this apparatus.
  • the apparatus comprises means for monitoring 110, means for storing 120, means for supervising 130, and means for providing 140.
  • the means for monitoring 110, means for storing 120, means for supervising 130, and means for providing 140 may be a monitoring means, storing means, supervising means, and providing means, respectively.
  • the means for monitoring 110, means for storing 120, means for supervising 130, and means for providing 140 may be a monitor, storage device, supervisor, and provider, respectively.
  • the means for monitoring 110, means for storing 120, means for supervising 130, and means for providing 140 may be a monitoring processor, storing processor, supervising processor, and providing processor, respectively.
  • the means for monitoring 110 monitors whether a terminal is configured for L1/L2 mobility while the terminal is being connected to a first cell and is being identified by a first cell-related terminal identifier (S110).
  • the first cell-related terminal identifier is related to the first cell.
  • the means for supervising 130 supervises whether the terminal experiences a RLF while the terminal is being connected to a second cell (S130).
  • the terminal may experience the RLF some arbitrary time later than at the time when it was configured for L1/L2 mobility.
  • the terminal is being identified by a second cell-related terminal identifier related to the second cell.
  • the second cell is different from the first cell.
  • the means for providing 140 provides a report on the RLF to a third cell (S140).
  • the report comprises the identifier of the first cell and the first cell-related terminal identifier.
  • the first, second, and third cells may be different from each other, or the third cell may be the same as one of the first cell and the second cell.
  • Fig. 7 shows an apparatus according to an example embodiment of the invention.
  • the apparatus may be a base station (in particular a gNB-Cll) or an element thereof.
  • Fig. 8 shows a method according to an example embodiment of the invention.
  • the apparatus according to Fig. 7 may perform the method of Fig. 8 but is not limited to this method.
  • the method of Fig. 8 may be performed by the apparatus of Fig. 7 but is not limited to being performed by this apparatus.
  • the apparatus comprises means for receiving 210, means for retrieving 220, and means for inhibiting 230.
  • the means for receiving 210, means for retrieving 220, and means for inhibiting 230 may be a receiving means, retrieving means, and inhibiting means, respectively.
  • the means for receiving 210, means for retrieving 220, and means for inhibiting 230 may be a receiver, retriever, and inhibitor, respectively.
  • the means for receiving 210, means for retrieving 220, and means for inhibiting 230 may be a receiving processor, retrieving processor, and inhibiting processor, respectively.
  • the means for receiving 210 receives a report on a RLF experienced by a terminal (S210).
  • the report comprises an identifier of a first cell and a first cell-related terminal identifier.
  • the identifier of the first cell indicates that the terminal was configured for L1/L2 mobility while the terminal was being connected to the first cell.
  • the first cell-related terminal identifier indicates that the terminal was being identified by the first cell-related terminal identifier when the terminal was configured for the L1/L2 mobility.
  • the first cell-related terminal identifier is a C-RNTI related to the first cell.
  • the means for retrieving 220 retrieves a context of the terminal based on the identifier of the first cell and the first cell-related terminal identifier (S220).
  • the means for inhibiting 230 inhibits interpreting the identifier of the first cell and the first cell-related terminal identifier comprised in the report such that the identifier of the first cell and the first cell-related terminal identifier indicate that the terminal experienced the RLF when the terminal was being connected to the first cell and was being identified by the first cell-related terminal identifier (S230).
  • Fig. 9 shows an apparatus according to an embodiment of the invention.
  • the apparatus comprises at least one processor 810, at least one memory 820 including computer program code, and the at least one processor 810, with the at least one memory 820 and the computer program code, being arranged to cause the apparatus to at least perform at least the method according to at least one of Figs. 6 and 8 and related description.
  • 5G 5th Generation
  • the invention is not limited to 5G. It may be used in other radio networks, too, e.g. in previous of forthcoming generations of 3GPP networks such as 4G, 6G, or 7G, etc. It may be used in non-3GPP networks providing L1/L2 mobility or a corresponding kind of mobility.
  • One piece of information may be transmitted in one or plural messages from one entity to another entity. Each of these messages may comprise further (different) pieces of information.
  • Names of network elements, network functions, protocols, and methods are based on current standards. In other versions or other technologies, the names of these network elements and/or network functions and/or protocols and/or methods may be different, as long as they provide a corresponding functionality.
  • CGI and PCI are examples of cell IDs used in RLF report.
  • each of the entities described in the present description may be based on a different hardware, or some or all of the entities may be based on the same hardware. It does not necessarily mean that they are based on different software. That is, each of the entities described in the present description may be based on different software, or some or all of the entities may be based on the same software.
  • Each of the entities described in the present description may be deployed in the cloud.
  • example embodiments of the present invention provide, for example, a terminal (such as a UE or a MTC device) or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • a terminal such as a UE or a MTC device
  • computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • example embodiments of the present invention provide, for example, a cell (represented by a base station such as a gNB or eNB) or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and
  • Implementations of any of the above described blocks, apparatuses, systems, techniques or methods include, as non-limiting examples, implementations as hardware,0 software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Each of the entities described in the present description may be embodied in the cloud.

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

Abstract

Procédé consistant : à surveiller si un terminal est configuré pour une mobilité L1/L2 tandis que le terminal est connecté à une première cellule et est identifié par un identifiant associé à une première cellule; à stocker un identifiant de la première cellule et l'identifiant lié à la première cellule si le terminal est configuré pour permettre la mobilité L1/L2 tandis que le terminal est connecté à la première cellule et est identifié par l'identifiant lié à la première cellule; à surveiller si le terminal subit une fonction de liaison radioélectrique (RLF) tandis que le terminal est connecté à une deuxième cellule différente de la première cellule et est identifié par un identifiant associé à une deuxième cellule; à fournir un rapport sur la RLF à une troisième cellule si le terminal subit la RLF, le rapport comprenant l'identifiant de la première cellule et l'identifiant lié à la première cellule.
PCT/EP2021/084487 2021-12-07 2021-12-07 Rapport rlf permettant la mobilité l1/l2 Ceased WO2023104287A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2021/084487 WO2023104287A1 (fr) 2021-12-07 2021-12-07 Rapport rlf permettant la mobilité l1/l2
EP21830989.6A EP4437758A1 (fr) 2021-12-07 2021-12-07 Rapport rlf permettant la mobilité l1/l2

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/084487 WO2023104287A1 (fr) 2021-12-07 2021-12-07 Rapport rlf permettant la mobilité l1/l2

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Cited By (1)

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WO2025106008A1 (fr) * 2023-11-15 2025-05-22 Telefonaktiebolaget Lm Ericsson (Publ) Rapport d'informations de mobilité déclenchée par l1/l2 (ltm) conjointement avec une défaillance liée à la radio

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WO2018171582A1 (fr) * 2017-03-23 2018-09-27 Huawei Technologies Co., Ltd. Mobilité de couche 2 (l2) pour de nouveaux réseaux radio (nr)
WO2021175744A1 (fr) * 2020-03-02 2021-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Rapport de défaillance de groupe de cellules maîtresses (mcg) et de défaillance de liaison radio (rlf)

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WO2021175744A1 (fr) * 2020-03-02 2021-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Rapport de défaillance de groupe de cellules maîtresses (mcg) et de défaillance de liaison radio (rlf)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025106008A1 (fr) * 2023-11-15 2025-05-22 Telefonaktiebolaget Lm Ericsson (Publ) Rapport d'informations de mobilité déclenchée par l1/l2 (ltm) conjointement avec une défaillance liée à la radio

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