WO2021212316A1 - Procédés et appareil de commutation de chemin pour relais ue-à-réseau de couche 3 - Google Patents

Procédés et appareil de commutation de chemin pour relais ue-à-réseau de couche 3 Download PDF

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Publication number
WO2021212316A1
WO2021212316A1 PCT/CN2020/085895 CN2020085895W WO2021212316A1 WO 2021212316 A1 WO2021212316 A1 WO 2021212316A1 CN 2020085895 W CN2020085895 W CN 2020085895W WO 2021212316 A1 WO2021212316 A1 WO 2021212316A1
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WO
WIPO (PCT)
Prior art keywords
remote
relay
gnb
link
n3iwf
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Application number
PCT/CN2020/085895
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English (en)
Inventor
Xuelong Wang
Original Assignee
Mediatek Singapore Pte. Ltd.
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Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2020/085895 priority Critical patent/WO2021212316A1/fr
Priority to PCT/CN2021/088677 priority patent/WO2021213436A1/fr
Publication of WO2021212316A1 publication Critical patent/WO2021212316A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • 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
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present disclosure relates generally to wireless communication, and more particularly, the method to enable the support of path switch for Layer-3 UE-to-Network Relay operation.
  • 3GPP Rel-13 specified the support for ProSe UE-to-Network Relay.
  • Relay UE forwards the traffic between Remote UE and Base Station at IP layer, as the Relay UE works as a Layer-3 Relay.
  • the requirement of service continuity for LTE ProSe UE-to-Network Relay is not a stringent requirement.
  • the path switch based service continuity was not specified from perspective of AS layer.
  • N3IWF non-3GPP interwork function
  • a method is provided to support path switch for the (Remote) UE from relay link to cell link or from cell link to relay link to enable service continuity for N3IWF based Layer-3 UE-to-Network Relay architecture.
  • the radio measurement is configured from Relay UE to Remote UE.
  • Remote UE reports the measurement result to Relay UE.
  • the path switch for Remote UE is coordinated among Relay UE, Relay UE’s serving gNB and Remote UE’s target gNB.
  • the PDU session of Remote UE is kept, as there is no change for the IP address for Remote UE.
  • the AMF/SMF signals UPF to switch the user plane path from N3IWF to gNB in order to enable the new use plane path for the Remote UE.
  • the radio measurement is configured from gNB to Remote UE.
  • Remote UE reports the measurement result to gNB.
  • the path switch for Remote UE is decided by its serving gNB.
  • the PDU session of Remote UE is kept, as there is no change for the IP address for Remote UE.
  • the AMF/SMF signals UPF to switch the user plane path from gNB to N3IWF in order to enable the new use plane path for the Remote UE.
  • FIG. 1 is a schematic system diagram illustrating an exemplary Base Station (i.e. BS) in accordance with embodiments of the current invention.
  • BS Base Station
  • Figure 1 (b) is a schematic system diagram illustrating an exemplary UE in accordance with embodiments of the current invention.
  • Figure 2 illustrates an exemplary NR wireless system in accordance with embodiments of the current invention.
  • Figure 3 illustrates an exemplary UE-to-Network Relay architecture in accordance with embodiments of the current invention.
  • Figure 4 illustrates an exemplary Intra-gNB path switch scenario from relay link to cell link in accordance with embodiments of the current invention.
  • Figure 5 illustrates an exemplary Intra-gNB path switch scenario from cell link to relay link in accordance with embodiments of the current invention.
  • Figure 6 illustrates an exemplary Inter-gNB path switch scenario from relay link to cell link in accordance with embodiments of the current invention.
  • Figure 7 illustrates an exemplary Inter-gNB path switch scenario from cell link to relay link in accordance with embodiments of the current invention.
  • Figure 8 illustrates an exemplary Inter-gNB path switch procedure from relay link to cell link in accordance with embodiments of the current invention.
  • Figure 9 illustrates an exemplary Intra-gNB path switch procedure from cell link to relay link in accordance with embodiments of the current invention.
  • FIG. 1 (a) is a schematic system diagram illustrating an exemplary Base Station (i.e. BS) in accordance with embodiments of the current invention.
  • the BS may also be referred to as an access point, an access terminal, a base station, a Node-B, an eNode-B, a gNB, or by other terminology used in the art.
  • base stations serve a number of mobile stations within a serving area, for example, a cell, or within a cell sector.
  • the Base Station has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signals, and sends them to processor.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functions.
  • Memory stores program instructions and data to control the operations of Base Station.
  • FIG. 1 (b) is a schematic system diagram illustrating an exemplary UE in accordance with embodiments of the current invention.
  • the UE may also be referred to as a mobile station, a mobile terminal, a mobile phone, smart phone, wearable, an IoT device, a table let, a laptop, or other terminology used in the art.
  • UE has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signal, and sends them to processor.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functional modules to perform features in UE.
  • Memory stores program instructions and data to control the operations of mobile station.
  • FIG. 2 illustrates an exemplary NR wireless system in accordance with embodiments of the current invention.
  • Different protocol split options between Central Unit and Distributed Unit of gNB nodes may be possible.
  • SDAP and PDCP layer are located in the central unit, while RLC, MAC and PHY layers are located in the distributed unit.
  • Figure 3 illustrates an exemplary layer-3 UE-to-Network Relay architecture in accordance with embodiments of the current invention.
  • the design of “untrusted non-3GPP access to 5GC via N3IWF” in Rel-15 5GC is leveraged.
  • Remote UE follows the procedures defined in TS 23.502 to register to 5GC via N3IWF and establish corresponding PDU sessions.
  • the data traffic over the PDU sessions are protected by IPSec security between the Remote UE and N3IWF.
  • the N3IWF is enhanced to support NAS connectivity to the 5GC and end-to-end security for Remote UEs via UE-to-NW Relay Access as another access type.
  • Remote UE accessing the data network take the Relay UE as an IP router and the traffic goes across gNB-2, UPF-1, N3IWF and UPF-2.
  • UPF-1 is used as the agent to connect to N3IWF from gNB-2.
  • FIG. 4 illustrates an exemplary Intra-gNB path switch scenario from relay link to cell link in accordance with embodiments of the current invention.
  • Figure 5 illustrates an exemplary Intra-gNB path switch scenario from cell link to relay link in accordance with embodiments of the current invention.
  • Figure 6 illustrates an exemplary Inter-gNB path switch scenario from relay link to cell link in accordance with embodiments of the current invention.
  • FIG 7 illustrates an exemplary Inter-gNB path switch scenario from cell link to relay link in accordance with embodiments of the current invention.
  • Relay UE is assumed to operate as Layer-3 UE-to-Network Relay as shown in Figure 3.
  • Relay UE is equivalent to UE-to-Network Relay.
  • FIG. 8 illustrates an exemplary Inter-gNB path switch procedure from relay link to cell link in accordance with embodiments of the current invention.
  • Relay UE configures the radio measurement.
  • the HO decision is made at Relay UE.
  • the PDU session of Remote UE is kept after switch, as there is no change for the IP address for Remote UE.
  • the AMF/SMF signals UPF to switch the user plane path from N3IWF to gNB in order to enable the new use plane path for the Remote UE.
  • the PC5 link is released after activation of Uu path.
  • Step 0 of Figure 8 there is ongoing relaying traffic between Remote UE and UPF (traversing N3IWF) .
  • Relay UE sends the Measurement configuration to Remote UE to measure cell (s) and/or other potential Relay UE (s) .
  • a list of frequency is included in the Measurement configuration. Based on the measurement result, Relay reselection procedure may be triggered. Alternatively, the Measurement configuration can be preconfigured.
  • Remote UE makes the radio measurements on the frequency following the measurement configuration on Uu and/or PC5.
  • Remote UE Selects the best Uu link.
  • Remote UE selects a number of Uu links. In this case, the exact Uu link selection is subject to Relay UE decision in Step 4 of Figure 8.
  • Step 3 of Figure 8 Remote UE reports the measurement result to Relay UE.
  • the CGI and/or PCI of the target cell may be included in order for Relay UE’s gNB to identify the cell.
  • Step 4 of Figure 8 Relay UE decides the path switch from PC5 to Uu link. However, before the Relay UE initiates the path switch for the Remote UE, Relay UE needs to get the acknowledgement from the target gNB.
  • Step 5 of Figure 8 Relay UE reports a handover request to its serving gNB carrying the Identity of the Remote UE, and the CGI and/or PCI of the target cell for Remote UE’s path switch.
  • Relay UE’s serving gNB sends Handover request to target gNB hosting the target cell carrying the Identity of the Remote UE and indicating the purpose of path switch for the Remote UE.
  • Step 7 of Figure 8 Remote UE’s target gNB performs access control and allocate access resources for the Remote UE (e.g. random access resources) .
  • Remote UE’s target gNB acknowledges the handover request to Relay UE’s serving gNB carrying (e.g. random access resources) .
  • Step 8 of Figure 8 Relay UE’s serving gNB forwards the handover acknowledgement from Remote UE’s target gNB to Relay UE.
  • Relay UE, Relay UE’s gNB and target gNB perform the Handover request/response coordination.
  • Relay UE’s gNB is the target gNB, the coordination is not needed.
  • Step 9 of Figure 8 Relay UE sends the handover command to Remote UE via PC5 RRC message.
  • the access resources allocated by Remote UE’s target gNB is included.
  • the cell ID of acknowledged cell can be included.
  • Step 10 of Figure 8 Remote UE accesses the target cell following the access resources allocated by Remote UE’s target gNB.
  • Step 11 of Figure 8 Remote UE sends RRC message e.g. RRCReconfigurationComplete to target gNB. Note that there is no traditional user plane path change triggered by target gNB after Step 11 since we assume it is the same UPF after the path switch from PC5 to cell link.
  • Step 12 of Figure 8 when the Uu link is established with target cell, Remote UE exchanges with AMF/SMF to modify the previously established PDU session traversing N3IWF. The coordination is based on the old link.
  • Step 13 of Figure 8 the AMF/SMF signals UPF to switch the user plane path from N3IWF to target gNB for the previously established PDU session. After switching the user plane path, the data flow of the PDU session is not traversing N3IWF any longer.
  • Step 14 of Figure 8 the UPF forwards the data packet to the new path (not traversing N3IWF any more) . Meanwhile, the buffered data at old path may be sent to the UE simultaneously.
  • Step 15 of Figure 8 the AMF/SMF releases the GTP-U Tunnel established between N3IWF and UPF for the previous PDU session.
  • the AMF/SMF may release the GTP-U Tunnel when UPF indicates that the buffered data has been already forwarded to the UE via old path.
  • Step 16 of Figure 8 the PC5 link between Relay UE and Remote UE is released and the old path is teared down.
  • Figure 9 illustrates an exemplary Intra-gNB path switch procedure from cell link to relay link in accordance with embodiments of the current invention.
  • the radio measurement is configured by source gNB.
  • the HO decision is made at gNB.
  • the Path switch is controlled by AMF/SMF.
  • the PDU session of Remote UE is kept after switch, as there is no change for the IP address for Remote UE.
  • the AMF/SMF signals UPF to switch the user plane path from gNB to N3IWF in order to enable the new use plane path for the Remote UE.
  • the Uu link is released after activation of PC5 path.
  • Step 1 of Figure 9 Before Step 1 of Figure 9, there is ongoing traffic between Remote UE and UPF and the Remote UE is served by source cell. Basically, Step 1-8 of Figure 9 follows the normal procedure to establish Relaying link for Remote UE within the cellular coverage.
  • Step 1 of Figure 9 the Base Station (i.e. source gNB) sends the Measurement Configuration to Remote UE including the frequency list to be measured for Cellular link and/or Relay link.
  • the Base Station sends Uu RRC message, e.g. Relay Discovery Command to Remote UE. This can be triggered by an indication previously sent from Remote UE to Base Station showing the interest to operate as Remote UE via UE-to-Network Relay in a certain frequency list.
  • Step 2 of Figure 9 Remote UE performs radio measurement.
  • Step 3 of Figure 9 Remote UE discovers Relay UE and selects the Relay UE via PC5-S signaling.
  • the trigger of Step 3 of Figure 9 can be based on the measurement event as configured by Base Station in Step 1 of Figure 9, or the criteria configured via system information or (pre-) configuration for Relay selection.
  • Step 4 of Figure 9 Remote UE sends Uu RRC message e.g. Measurement Report to the Base Station.
  • the Relay UE Identity information e.g. Relay UE ID is reported to the Base Station.
  • Step 5 of Figure 9 based on the received RRC message in Step 4, the Base Station decides to handover the Remote UE from the serving gNB to the UE-to-Network Relay.
  • Step 6 of Figure 9 the Base Station sends RRCReconfiguration message to Remote UE.
  • Step 6 of Figure 9 also instructs Remote UE to establish the unicast link with Relay UE at Step 8 of Figure 9. Then the security may be activated after the establishment of the unicast link between Remote UE and Relay UE.
  • Step 7 of Figure 9 the Base Station orders Relay UE to prepare relaying.
  • the Base Station can send an RRCReconfiguration message to the UE-to-Network Relay to configure the PHY, MAC, RLC, PDCP, SDAP layers or any combination among them for the relaying bearer (s) between Relay UE and Base Station.
  • Step 8 of Figure 9 Remote UE and Relay UE establish the unicast link.
  • Step 9 of Figure 9 Remote UE establishes signaling IPsec tunnel using IKE procedures with N3IWF. Then Remote UE may perform NAS Registration update.
  • Step 10 of Figure 9 after the IPSec tunnel is established, Remote UE can perform PDU session modification or new PDU Session establishment, or any required NAS procedures.
  • Step 10 of Figure 9 when the Uu link is established with target cell, Remote UE exchanges with AMF/SMF to modify the previously established PDU session traversing N3IWF. The coordination is based on the old link. Note that there is no traditional user plane path change triggered by target gNB after Step 10 since we assume it is the same UPF after the path switch from PC5 to cell link.
  • Step 11 of Figure 9 the AMF/SMF signals UPF to switch the user plane path from source gNB to N3IWF for the previously established PDU session. After switching the user plane path, the data flow of the PDU session is traversing N3IWF.
  • Step 12 of Figure 9 the UPF forwards the data packet to the new path (traversing N3IWF) . Meanwhile, the buffered data at old path may be sent to the UE simultaneously.
  • Step 13 of Figure 9 the AMF/SMF releases the GTP-U Tunnel established between source gNB and UPF for the previous PDU session.
  • the AMF/SMF may release the GTP-U Tunnel when UPF indicates that the buffered data has been already forwarded to the UE via old path.
  • Step 14 of Figure 9 the Remote UE may send RRCReconfigurationComplete message to the Base Station. It indicates that Remote UE will not use the direct Uu PHY radio resource anymore and release the corresponding air interface resources.
  • Step 15 of Figure 9 the source gNB to release Uu connection with the Remote UE. Alternatively, the release can be done autonomously.

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

Abstract

L'invention concerne un appareil et des procédés prenant en charge une commutation de chemin pour l'UE (distant) depuis une liaison relais vers une liaison cellulaire, ou depuis une liaison cellulaire vers une liaison relais, de façon à assurer une continuité de service d'exploitation pour une architecture de relais de réseau UE-à-réseau de couche 3. Dans un nouvel aspect, pour la commutation de chemin depuis une liaison relais vers une liaison de cellule, la commutation de chemin pour l'UE distant est coordonnée entre l'UE relais, le gNB de desserte de l'UE relais et le gNB cible de l'UE distante. La session PDU de l'UE distant est conservée, étant donné qu'il n'y a pas de changement d'adresse IP pour l'UE distant. L'AMF/SMF signalise à l'UPF de commuter le chemin de plan d'utilisateur, de N3IWF à gNB afin d'activer le nouveau chemin de plan d'utilisateur pour l'UE distant.
PCT/CN2020/085895 2020-04-21 2020-04-21 Procédés et appareil de commutation de chemin pour relais ue-à-réseau de couche 3 WO2021212316A1 (fr)

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PCT/CN2020/085895 WO2021212316A1 (fr) 2020-04-21 2020-04-21 Procédés et appareil de commutation de chemin pour relais ue-à-réseau de couche 3
PCT/CN2021/088677 WO2021213436A1 (fr) 2020-04-21 2021-04-21 Commutation de chemin pour relais ue-à-réseau de couche 3

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PCT/CN2020/085895 WO2021212316A1 (fr) 2020-04-21 2020-04-21 Procédés et appareil de commutation de chemin pour relais ue-à-réseau de couche 3

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PCT/CN2021/088677 WO2021213436A1 (fr) 2020-04-21 2021-04-21 Commutation de chemin pour relais ue-à-réseau de couche 3

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CN114222341A (zh) * 2021-12-21 2022-03-22 中国联合网络通信集团有限公司 会话接续方法和会话管理功能实体
WO2023102693A1 (fr) * 2021-12-06 2023-06-15 Oppo广东移动通信有限公司 Procédé de communication sans fil, ue distant et dispositif de réseau
WO2024011639A1 (fr) * 2022-07-15 2024-01-18 北京小米移动软件有限公司 Procédé de commutation de trajet, appareil, dispositif et support de stockage
GB2623066A (en) * 2022-09-30 2024-04-10 Canon Kk Method and apparatus for use in managing handover of a relay user equipment
WO2024073888A1 (fr) * 2022-10-08 2024-04-11 Mediatek Inc. Gestion de changement de cellule par un ue relais dans un état de protocole au repos ou inactif
WO2024091565A1 (fr) * 2022-10-25 2024-05-02 Ofinno, Llc Chemins multiples

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WO2024036491A1 (fr) * 2022-08-16 2024-02-22 Zte Corporation Assurance de continuité de service par achèvement de transferts

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WO2023102693A1 (fr) * 2021-12-06 2023-06-15 Oppo广东移动通信有限公司 Procédé de communication sans fil, ue distant et dispositif de réseau
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WO2024073888A1 (fr) * 2022-10-08 2024-04-11 Mediatek Inc. Gestion de changement de cellule par un ue relais dans un état de protocole au repos ou inactif
WO2024091565A1 (fr) * 2022-10-25 2024-05-02 Ofinno, Llc Chemins multiples

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