WO2022151298A1 - 群组迁移方法、装置和系统 - Google Patents

群组迁移方法、装置和系统 Download PDF

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Publication number
WO2022151298A1
WO2022151298A1 PCT/CN2021/071957 CN2021071957W WO2022151298A1 WO 2022151298 A1 WO2022151298 A1 WO 2022151298A1 CN 2021071957 W CN2021071957 W CN 2021071957W WO 2022151298 A1 WO2022151298 A1 WO 2022151298A1
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WIPO (PCT)
Prior art keywords
connection
tnl address
donor
iab node
migrating
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PCT/CN2021/071957
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English (en)
French (fr)
Inventor
路杨
Original Assignee
富士通株式会社
路杨
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Publication date
Application filed by 富士通株式会社, 路杨 filed Critical 富士通株式会社
Priority to PCT/CN2021/071957 priority Critical patent/WO2022151298A1/zh
Priority to JP2023541094A priority patent/JP2024502450A/ja
Priority to CN202180085102.6A priority patent/CN116724589A/zh
Priority to EP21918506.3A priority patent/EP4280666A1/en
Publication of WO2022151298A1 publication Critical patent/WO2022151298A1/zh
Priority to US18/215,216 priority patent/US20230345326A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/30Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305Handover due to radio link failure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • H04W36/087Reselecting an access point between radio units of access points
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to the field of communications.
  • Ultra-dense network is one of the goals of 5G. Deploying an NR network without wired backhaul is very important to realize 5G's ultra-dense network. As 5G millimeter wave reduces the cell coverage, the wireless self-backhaul system also needs to be multi-hop to meet the deployment requirements. 5G's high bandwidth, massive MIMO and beam systems make 5G easier than LTE to develop wireless self-backhaul systems for ultra-dense NR cells, in order to develop this multi-hop system with wireless self-backhaul, 3GPP started IAB in R16 (Integrated access and backhaul, access and backhaul integration) project research and standardization.
  • R16 Integrated access and backhaul, access and backhaul integration
  • Figure 1 is a schematic diagram of the IAB system.
  • the relay node supports both access and backhaul functions, and the wireless transmission link of the relay node is in the time domain,
  • the access link and the backhaul link are multiplexed in the frequency domain or the space domain, and the access link and the backhaul link can use the same or different frequency bands.
  • the relay node refers to an IAB-node (IAB node), which supports both access and backhaul functions.
  • IAB node The last hop access node on the network side is called IAB-donnor (IAB host), which supports the gNB function and supports IAB-node access. All UE data can be sent back to IAB-donor via IAB-node through one or more hops.
  • the function of the IAB-node is divided into two parts, one part is the gNB-DU function, called IAB-DU, and the other part is the UE function, called IAB-MT.
  • the IAB-DU realizes the function of the network side device, connects to the downstream child IAB-node (child IAB node), provides NR air interface access to the UE and the downstream child IAB-node, and establishes an F1 connection with the IAB donor-CU.
  • IAB-MT implements some terminal equipment functions and is connected to the upstream parent IAB-node (parent IAB node) or IAB-donor DU.
  • IAB-MT includes physical layer, layer 2, RRC (Radio Resource Control, Radio Resource Control) and NAS (Non-Access Stratum, non-access layer) layer function, also indirectly connected to IAB donor-CU and core network (Core Network, CN).
  • the IAB-node can access the network in an independent networking (SA, Standalone) mode or a non-independent networking (EN-DC, E-UTRA-NRDual Connectivity) mode.
  • SA independent networking
  • EN-DC non-independent networking
  • FIG. 2 is a schematic diagram of an IAB architecture in SA mode.
  • Figure 3 is a schematic diagram of an IAB architecture in EN-DC mode.
  • FIG. 4 is a schematic diagram of an IAB node (IAB-node), a parent node (parent IAB-node) and a child node (child IAB-node).
  • IAB-node IAB node
  • parent IAB-node parent node
  • child IAB-node child node
  • the IAB-DU of the IAB node is connected to the IAB-MT of the child node as the network side
  • the IAB-MT of the IAB node is connected to the IAB-DU of the parent node as the terminal side.
  • Figure 5 is a schematic diagram of the F1 user plane (F1-U) protocol stack between the IAB-DU and the IAB-donor CU.
  • Figure 6 is a schematic diagram of the F1 control plane (F1-C) protocol stack between the IAB-DU and the IAB-donor CU.
  • F1-U and F1-C are built on the transport (IP) layer between IAB-DU and IAB-donor-CU. and one-hop wired backhaul.
  • IP transport
  • BAP backhaul adaptive protocol
  • BAP PDUs Protocol Data Units
  • RLC Radio Link Control
  • multiple RLC channels of the backhaul link can be configured by the IAB-donor to carry different priorities and QoS (Quality of Service) ) service
  • the BAP entity maps BAP PDUs to different return RLC channels.
  • R17 will introduce the mobility function of IAB-node between different Donors.
  • the IAB-node since the IAB-node is connected to the new Donor, it becomes the DU under the new Donor to serve its child IAB node or UE, Therefore, it is necessary to establish an F1-C connection with the new Donor and migrate the child IAB nodes or UEs under the IAB-node to the new Donor, so as to achieve load balancing among the donor devices.
  • Migrating IAB-node needs to know whether it is migrating between donors or whether to establish a new F1-C connection, but the existing technology cannot indicate whether Migrating IAB-node is migrating between donors and whether it needs to establish a new F1 connection -C connect.
  • the Migrating IAB-node can maintain the F1-C connection with the original Donor and the new Donor at the same time. It needs to redirect the old and new F1 connections at the same time to optimize the F1 forwarding path.
  • the existing technology cannot make the IAB-node distinguish between the redirection of the old F1-C connection or the new F1-C connection.
  • embodiments of the present application provide a group migration method, apparatus, and system.
  • a group migration apparatus which is configured on a second Donor device, and the apparatus includes:
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1-C connection is the DU of the migrated IAB node and the CU of the first Donor device.
  • F1 connection between the CUs of the second Donor device, the first TNL address and the third TNL address are TNL addresses routable to the DUs of the first Donor device, the second TNL address and
  • the fourth TNL address is the TNL address of the DU routable to the second Donor device.
  • a receiving unit which receives from the first Donor device a first RRC reconfiguration message sent by the second Donor device, where the first RRC reconfiguration message includes at least one of the following:
  • a second TNL address for the first F1-C to update the first TNL address of the first F1-C connection to the second TNL address, or to add the first F1-C connection to the Second TNL address;
  • Fourth TNL address for the second F1-C to update the third TNL address of the second F1-C connection to the fourth TNL address, or use the fourth TNL address with the second
  • the CU of the Donor device establishes the second F1-C connection, or adds the fourth TNL address for the second F1-C connection;
  • the third TNL address for the second F1-C connection to add the third TNL address for the second F1-C connection, or to use the third TNL address to establish a relationship with the CU of the second Donor device. the second F1-C connection;
  • a group migration apparatus which is configured on a first Donor device and moves an IAB node from the first Donor device to a second Donor device, wherein the apparatus includes:
  • a receiving unit which receives the second TNL address of the first F1-C connection of the migrated IAB node sent by the second Donor device;
  • a processing unit which updates the first TNL address of the first F1-C connection of the migrating IAB node to the second TNL address, or adds the second TNL address to the first F1-C connection of the migrating IAB node TNL address;
  • the target Donor when the Migrating IAB-node moves from the original Donor to the target donor, the target Donor can indicate whether the migrating IAB node is migrating between donors or whether to establish a new F1-C connection, so that the migration
  • the IAB node can establish a new F1-C connection with the target Donor when migrating between donors, and become the DU under the new Donor to serve its child IAB node or UE, and realize the migration of the child IAB node or UE under the migrated IAB node to the target Donor.
  • the load balancing between donor devices is completed.
  • the target Donor can redirect the original F1 connection and the new F1 connection at the same time, and move to the migrating IAB
  • the node indicates the redirection of the old F1-C connection or the new F1-C connection, thereby optimizing the forwarding path of the old F1-C connection as well as the new F1-C connection.
  • Fig. 1 is a schematic diagram of the IAB system
  • Fig. 2 is the schematic diagram of the IAB architecture of SA mode
  • Fig. 3 is the schematic diagram of the IAB framework of EN-DC mode
  • Figure 4 is a schematic diagram of a parent node (parent IAB-node) and a child node (child IAB-node);
  • Fig. 5 is the schematic diagram of the F1-U protocol stack of the IAB system
  • Fig. 6 is the schematic diagram of the F1-C protocol stack of the IAB system
  • Fig. 7 is a schematic diagram of an IAB node moving between different DUs under the same Donor
  • FIG. 8 is a schematic diagram of a group migration method according to an embodiment of the present application.
  • Fig. 10 is a schematic diagram of information interaction under the scenario shown in Fig. 9;
  • FIG. 11a and 11b are schematic diagrams of another scenario of the group migration method according to the embodiment of the present application.
  • Fig. 12 is a schematic diagram of information interaction under the scenarios shown in Fig. 11a and Fig. 11b;
  • FIG. 13a and 13b are schematic diagrams of still another scenario of the group migration method according to the embodiment of the present application.
  • Figure 14 is a schematic diagram of information interaction under the scenarios shown in Figures 13a and 13b;
  • 15 is a schematic diagram of still another scenario of the group migration method according to the embodiment of the present application.
  • Fig. 18 is a schematic diagram of information interaction under the scenarios shown in Fig. 17a and Fig. 17b;
  • Fig. 20 is a schematic diagram of information interaction under the scenarios shown in Fig. 19a and Fig. 19b;
  • 21 is a schematic diagram of a group migration apparatus according to an embodiment of the present application.
  • FIG. 22 is another schematic diagram of a group migration apparatus according to an embodiment of the present application.
  • FIG. 24 is another schematic diagram of a group migration apparatus according to an embodiment of the present application.
  • 25 is a schematic diagram of a communication system according to an embodiment of the present application.
  • 26 is a schematic diagram of an IAB node in an embodiment of the present application.
  • FIG. 27 is a schematic diagram of a Donor device according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements in terms of numelation, but do not indicate the spatial arrangement or temporal order of these elements, and these elements should not be referred to by these terms restricted.
  • the term “and/or” includes any and all combinations of one or more of the associated listed items.
  • the terms “comprising”, “including”, “having”, etc. refer to the presence of stated features, elements, elements or components, but do not preclude the presence or addition of one or more other features, elements, elements or components.
  • the term "communication network” or “wireless communication network” may refer to a network that conforms to any of the following communication standards, such as New Radio (NR, New Radio), Long Term Evolution (LTE, Long Term Evolution), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • High-Speed Packet Access High-Speed Packet Access
  • the communication between devices in the communication system can be carried out according to communication protocols at any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, 6G, etc., and/or other communication protocols currently known or to be developed in the future.
  • 1G generation
  • 2G 2.5G, 2.75G
  • 3G 3G
  • 4G 4.5G
  • future 5G, 6G, etc. and/or other communication protocols currently known or to be developed in the future.
  • the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), and 5G base station (gNB), etc., and may also include a remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low power node (eg femto, pico, etc.).
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low power node eg femto, pico, etc.
  • base station may include some or all of their functions, each base station may provide communication coverage for a particular geographic area.
  • the term "cell” may refer to a base station and/or its coverage area, depending on the context in which the term is used.
  • the term "User Equipment” refers to a device that accesses a communication network through a network device and receives network services, and may also be called “Terminal Equipment” (TE, Terminal Equipment).
  • a terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS, Mobile Station), a terminal, a user, a subscriber station (SS, Subscriber Station), an access terminal (AT, Access Terminal), a station, etc. Wait.
  • the terminal device may also be a machine or device that performs monitoring or measurement, such as but not limited to: Machine Type Communication (MTC, Machine Type Communication) terminals, In-vehicle communication terminals, device-to-device (D2D, Device to Device) terminals, machine-to-machine (M2M, Machine to Machine) terminals, etc.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • the embodiment of the present application provides a group migration method.
  • FIG. 8 is a schematic diagram of a group migration method according to an embodiment of the present application, which is described from the side of the second Donor device.
  • the migrating IAB node moves from the first Donor device to the second Donor device.
  • the first Donor device in this embodiment of the present application is the original Donor device, which is referred to as the first Donor or the original Donor for short.
  • the second Donor device is the target Donor device, referred to as the second Donor or the target Donor for short.
  • the method includes:
  • a fourth TNL address for the second F1-C connection is added for the migrating IAB node.
  • the migration of the IAB node from the first Donor device to the second Donor device means that when the backhaul RLC link of the migrated IAB node under the first Donor device fails, the radio link is re-established to the second Donor device.
  • the second Donor device; or, the migrating IAB node switches from the first Donor device to the second Donor device; or, the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device.
  • the first F1-C connection (referred to as the first F1-C or the original F1-C for short) is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1 -C connection (abbreviated as second F1-C or new F1-C) is the F1 connection between the DU of the migrated IAB node and the CU of the second Donor device.
  • the first TNL address, the third TNL address, and the fifth TNL address are the TNL addresses of the DUs routable to the first Donor device, the second TNL address, the fourth TNL address, and the sixth TNL address.
  • the TNL address is the TNL address of the DU routable to the second Donor device.
  • the second Donor instructs the migrating IAB node to establish a new F1-C by configuring the TNL address for the second F1-C to the migrating IAB node
  • the connection makes the migrated IAB node become the DU under the new Donor to serve its sub-IAB node or UE, so that the IAB system can realize the migration of the sub-IAB node or UE under the migrated IAB node to the target Donor and complete the load between the donor devices. balanced.
  • the second Donor updates the TNL address of the first F1-C or updates the first Donor.
  • the TNL address of the second F1-C redirects the F1-C connection, optimizes the forwarding path of the F1-C, and realizes more efficient signaling forwarding; -C increases the TNL address, increases the forwarding path of F1-C, and realizes more flexible signaling forwarding.
  • the second Donor device when a radio link failure occurs on the backhaul RLC link of the migrating IAB node under the first Donor device, it is re-established to the second Donor device.
  • the second Donor device causes the migrating IAB node to update the first TNL address of the first F1-C connection to the second TNL address, and configures the migrating IAB node with a fourth TNL address for establishing the second F1-C connection.
  • the second Donor device sends the first RRC reconfiguration message to the migrating IAB node.
  • the first RRC reconfiguration message contains the second TNL address for the first F1-C connection, whereby the migrating IAB node can update the first TNL address of the first F1-C connection to the second TNL address; or , the first RRC reconfiguration message contains the second TNL address for the first F1-C connection and the fourth TNL address for the second F1-C connection, whereby the migrating IAB node redistributes the first F1-C
  • the first TNL address of the C connection is updated to the second TNL address and the fourth TNL address is used to establish a second F1-C connection with the CU of the second Donor device.
  • the above-mentioned first RRC reconfiguration message may further include: the BAP address allocated to the relocated IAB node; and/or, the backhaul RLC channel configuration of the relocated IAB node, and the configuration for the F1-C and non-relocated IAB nodes.
  • the default BAP routing identifier and the default return RLC channel identifier of the F1 data and/or, for the migrating IAB node to update the fifth TNL address of its F1-U connection to the sixth TNL address of the sixth TNL address, so that F1 The -U connection may be forwarded through the DU of the second Donor; and/or, the BAP routing identifier and the backhaul RLC channel identifier used for the F1-U connection of the migrated IAB node.
  • the second Donor device may also send a third RRC reconfiguration message to the migrated IAB node; the third RRC reconfiguration message
  • the configuration message contains the fourth TNL address for the second F1-C connection. Therefore, after receiving the third RRC reconfiguration message, the migrating IAB node can establish a second F1-C connection with the CU of the second Donor device using the above-mentioned fourth TNL address.
  • the above-mentioned first message may include the above-mentioned first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context to establish the second context of the UE;
  • a message may be an F1 setup response or a UE context modification request message.
  • the foregoing first message may further include the serving cell configuration information of the foregoing UE, so that the migrating IAB node updates the foregoing serving cell configuration of the foregoing UE.
  • the migrating node only needs to obtain the first context of the UE according to the first context identifier and reuse the first context to establish the second context of the UE, without the need to go through the existing UE context establishment process, which can reduce the UE context Signaling overhead and delay during establishment to improve signaling efficiency.
  • the second Donor device may also send a second RRC reconfiguration message for the UE served by the migrated IAB node to the first Donor device, so that the first Donor device uses the foregoing second TNL address
  • the second RRC reconfiguration message is forwarded to the migrating IAB node through the above-mentioned first F1-C connection. Therefore, after receiving the second RRC reconfiguration message, the migrating IAB node can send the second RRC reconfiguration message to the UE it serves.
  • the migrating IAB node may also receive a second RRC reconfiguration complete message sent by the UE it serves, and use the fourth TNL address to send the second RRC reconfiguration complete message to the second Donor through the second F1-C connection equipment.
  • the second Donor device can also receive the second RRC reconfiguration complete message sent by the relocated IAB node using the aforementioned fourth TNL address through the aforementioned second F1-C connection.
  • the first Donor device may also use the first TNL address to send a second message to the migrating IAB node through the first F1-C connection, where the second message includes the first message for the F1-U connection of the migrating IAB node.
  • the second message includes the first message for the F1-U connection of the migrating IAB node.
  • the migrating IAB node can receive the second message and update the fifth TNL address of its F1-U connection to the sixth TNL address, so that the F1-U connection can be forwarded through the DU of the second Donor, which optimizes F1 -U The transmission path of the connection.
  • the first Donor device may also receive the second TNL address of the first F1-C connection of the migrating IAB node sent by the second Donor device, and send the first F1-C connection of the migrating IAB node to the first F1-C connection.
  • the TNL address is updated to the second TNL address, so that the first F1-C is redirected on the side of the first Donor device, and the transmission path of the first F1-C is optimized.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrated IAB node sent by the second Donor device, and update the fifth TNL address of the F1-U connection of the migrated IAB node For the sixth TNL address, F1-U is redirected on the side of the first Donor device, and the transmission path of F1-U is optimized.
  • FIG. 9 is an exemplary diagram of an application scenario of the foregoing embodiment
  • FIG. 10 is a schematic diagram of information interaction of the foregoing embodiment. The above embodiment will be described below with reference to FIG. 9 and FIG. 10 .
  • a radio link failure occurs on the backhaul (BH) link of the migrating node, causing the migrating node to select donor 2 for connection re-establishment. Since it is re-established to Donor 2, the migrating node can only establish F1-C with Donor 2 after connecting to Donor 2.
  • the original F1-C (old F1-C), that is, the F1-C of the Donor CU 1 and the migrating node, may also be updated from the original transmission path to the new transmission path.
  • the UE's RRC reconfiguration completion message needs to be sent to Donor 2 through the new F1-C (new F1-C), that is, the F1-C of Donor CU 2 and migrating node, so the migrating node migrates to Donor 2 before the UE.
  • new F1-C new F1-C
  • the information exchange process includes:
  • the Migrating node detects a radio link failure on the BH link, and selects a cell under IAB-node 2 to re-establish the RRC connection, during which Donor 2 obtains the context of the migrating node and the UE it serves from Donor 1.
  • the Donor CU 2 sends an RRCReconfiguration message to the migrating node. Because the change is connected to donor 2, the message also includes the BAP address assigned by donor 2 to migrating node. Since the backhaul link is changed to IAB-node 2, the message also includes from migrating node to IAB-node 2
  • the BH RLC channel configuration for F1-C and non-F1 data along with BAP routing (default routing) and new BH RLC channel (default BH channel ID).
  • the access anchor point of the Old F1 connection established between Donor CU 1 and migrating node is changed from IAB-node 1 to IAB-node 2
  • the original F1 data needs to pass through Donor DU 2 and IAB-node 2 under Donor 2 Forwarding, that is, the transmission is converted from the original path to the new path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU 1).
  • the migrating node needs to be configured with a subnet address suitable for Donor DU 2.
  • the signaling of the UE is still sent to the Donor CU 1 through the Old F1-C, but the Old F1-C needs to be transferred to the new path, so the RRC reconfiguration message also includes the TNL address of the Old F1-C to update the old F1-C. C's transmission path.
  • the DRB data of the UE is still sent to Donor CU 1 through F1-U (that is, F1-U established between migrating node and Donor CU1), and F1-U is transferred from the original path to the new path (that is, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU 1).
  • the RRC reconfiguration message can also contain the TNL address of F1-U, indicating to update the transmission path of F1-U, so that the migrating node can immediately switch F1-U to the new path for transmission ;
  • the RRC reconfiguration message can also include the BAP routing for F1-U and the BH RLC channel mapping relationship, for example, specifically, the RRC reconfiguration message includes the BAP used by the RLC channel of each UE Route, and the correspondence between UE ID, UE's RLC channel to the backhaul RLC channel of the migrating node.
  • Donor CU 2 initiates a core network path switch for the migrating node after receiving the RRC reconfiguration of the migrating node.
  • the above-mentioned operation of 1004 may be performed immediately after the above-mentioned operation of 1001, but this application does not limit it.
  • the migrating node can also use the updated TNL address to convert F1-U to the new path.
  • Migrating node establishes new F1-C with donor CU 2 using the TNL address instructing to establish new F1-C.
  • the Donor CU1 sends an F1AP message to the migrating node through the Old F1-C, that is, UE context modification, to update the F1-U's TNL address, make F1-U switch to a new path, and also modify the BAP route of F1-U and the mapping relationship of BH RLC channel, for example, specifically, configure the BAP route used by the RLC channel of each UE through the F1AP message, And configure the corresponding relationship between the UE ID and the RLC channel of the UE to the return RLC channel of the migrating node.
  • the Old F1-C that is, UE context modification
  • the BAP route of F1-U and the mapping relationship of BH RLC channel for example, specifically, configure the BAP route used by the RLC channel of each UE through the F1AP message, And configure the corresponding relationship between the UE ID and the RLC channel of the UE to the return RLC channel of the migrating node.
  • operation 1007 may be performed immediately after operation 1005, but this application does not limit it.
  • the Migrating node can allocate a C-RNTI to the UE, and send the C-RNTI to the Donor CU2 through the UE context setup response.
  • the UE contxt setup request includes the F1-U configuration for the UE DRB.
  • the F1-U can be configured on the donor CU1 side, and the UE's DRB uses the UL TNL address of the Donor CU 1; it can also be configured on the donor DU 2 side.
  • the DRB of the UE uses the UL TNL address of Donor CU 2, and then the migrating node converts the F1-U of the UE from Donor CU 1 to Donor CU 2.
  • the UE context modification carries the context identifier of the UE in the Old F1-C, and the migrating node can obtain the UE context in the Old F1-C according to the context identifier of the UE and use it to create a new UE in the New F1-C. context. Since the migrating node switches to donor 2 to change the serving cell identifier, the UE context modification can contain the serving cell identifier of the UE, and the migrating node replaces the serving cell identifier in the original UE context with the cell identifier.
  • the C-RNTI may also be changed when the UE changes the serving cell, so the Migrating node allocates a new C-RNTI to the UE and replaces the original C-RNTI with the new C-RNTI.
  • the Migrating node can send the new C-RNTI to the Donor CU2 through the UE context setup response.
  • the F1-U configuration can be modified in the UE contxt modification, the modified F1-U can still be on the donor CU1 side, and the DRB of the UE uses the UL TNL address of the Donor CU1; or the F1-U can be changed from the Donor CU1 side.
  • CU 1 switches to the donor DU 2 side, the UE DRB uses the UL TNL address of the Donor CU 2, and then the migrating node sends the UE's DRB data to the Donor CU 2.
  • a new context is created by using the original UE context, which can save signaling overhead.
  • Method 3 Donor CU 2 establishes a new context of the UE by sending an F1 setup response message (F1 Setup Response) when establishing a new F1-C with the migrating node.
  • F1 setup response message F1 Setup Response
  • the F1 Setup Response can carry the context identifiers of multiple UEs in the old F1-C, and the migrating node can obtain the UE context in the old F1-C according to the context identifiers of the UE and use it in the new F1-C. Create a new context for the UE.
  • the F1 Setup Response may also contain the serving cell identifiers of multiple UEs, and the migrating node replaces the serving cell identifiers in the original UE context with the cell identifiers. In this way, when F1 is established, a new context is created by using the original context of the UE, which saves the process of establishing a context for each UE individually, and can save signaling overhead and signaling delay.
  • the UE sends an RRC reconfiguration complete message to Donor CU 2 through New F1-C, and the sending path is: migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU 2.
  • the second Donor device configures the TNL address of the first F1-C connection through the RRC message, so that the first F1-C connection can be forwarded through the DU of the second Donor device, and the first F1-C connection is optimized.
  • the second Donor device can also configure the TNL address of the second F1-C connection through the RRC message, so that the migrating IAB node is re-established to the second Donor device and immediately establishes the second F1-C connection. Migrate to the second Donor device to achieve load balancing between donors.
  • the migrating node when establishing the UE context in the second F1-C connection, the migrating node only needs to obtain the first context of the UE through the first context identifier of the UE in the first F1-C connection and reuse the first context to establish the UE's first context.
  • the second context does not need to use the existing UE context establishment process, which can reduce signaling overhead and delay in UE context establishment, and improve signaling efficiency.
  • the migrating IAB node switches from the first Donor device to the second Donor device, and the migrating node establishes the second F1-C connection after switching to the second Donor device.
  • the second Donor device may configure the migrating IAB node with a fourth TNL address for establishing the second F1-C connection; or, the second Donor device may configure the migrating IAB node with a fourth TNL address for establishing the second F1-C connection the fourth TNL address, and cause the migrating IAB node to update the first TNL address of the first F1-C connection to the second TNL address.
  • the first RRC reconfiguration message contains a handover command and a fourth TNL address for the second F1-C connection, whereby the migrating IAB node can use the fourth TNL address to establish a second F1 with the CU of the second Donor device -C connect.
  • the first RRC reconfiguration message contains a handover command and a second TNL address for the first F1-C connection, whereby the migrating IAB node can update the first TNL address of the first F1-C connection to the second TNL address for the first F1-C connection Two TNL addresses.
  • the second Donor device configures the TNL address of the first F1-C connection through an RRC message, and instructs to update the TNL address of the first F1-C connection, so that the first F1-C connection can pass through the DU of the second Donor Forwarding is performed to optimize the transmission path of the first F1-C connection, or the second Donor device can configure the TNL address of the second F1-C connection through an RRC message, so that the migrating IAB node is switched to the second Donor device immediately after the establishment of the second Donor device.
  • Two F1-C connections, so that the subsequent migration of the UE can be realized.
  • the above-mentioned first RRC reconfiguration message may further include: the BAP address allocated to the migrating IAB node; and/or, the backhaul RLC channel configuration of the migrating IAB node, and for F1-C and non-F1 data
  • the default BAP routing identifier and the default return RLC channel identifier and/or, for the migrating IAB node to update the fifth TNL address of its F1-U connection to the sixth TNL address of the sixth TNL address, so that the F1-U connection It can be forwarded through the DU of the second Donor; and/or, the BAP route identifier and the backhaul RLC channel identifier used to migrate the F1-U connection of the IAB node.
  • the second Donor device may also send a third RRC reconfiguration message to the migrating IAB node, where the third RRC reconfiguration message contains information for the second F1 - The fourth TNL address of the C connection. Therefore, after receiving the third RRC reconfiguration message, the migrating IAB node can establish a second F1-C connection with the CU of the second Donor device using the above-mentioned fourth TNL address.
  • the CU of the second Donor device can use the above-mentioned fourth TNL address
  • a first message is sent to the DU of the relocated IAB node through the second F1-C connection, so that the relocated IAB node establishes a second context for the UE served by the relocated IAB node; the first message may be an F1 establishment response, a UE context establishment request or a UE context Modify the request message.
  • the first message may include the first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context to establish the second context of the UE.
  • the first message may further include the serving cell configuration information of the UE, so that the migrating IAB node updates the serving cell configuration of the UE.
  • the migrating node only needs to obtain the first context of the UE according to the first context identifier and reuse the first context to establish the second context of the UE, without going through the existing UE context establishment process, which can reduce the UE context Signaling overhead and delay during establishment to improve signaling efficiency.
  • the migrating IAB node may also receive a second RRC reconfiguration complete message sent by the UE it serves, and use the fourth TNL address to send the second RRC reconfiguration complete message to the second Donor through the second F1-C connection equipment.
  • the second Donor device can also receive the second RRC reconfiguration complete message sent by the relocated IAB node using the aforementioned fourth TNL address through the aforementioned second F1-C connection.
  • the first Donor device may also use the foregoing second TNL address to send a second message to the migrating IAB node through the first F1-C connection, where the second message includes the F1-U connection used for migrating the IAB node or the sixth TNL address used for migrating the F1-U connection of the IAB node and the BAP routing identifier and the backhaul RLC channel identifier of the F1-U connection used for migrating the IAB node.
  • the migrating IAB node can update the fifth TNL address of its F1-U connection to the sixth TNL address, so that the F1-U connection can be forwarded through the DU of the second Donor, and the transmission path of the F1-U connection is optimized.
  • the first Donor device may also receive the second TNL address of the first F1-C connection of the migrating IAB node sent by the second Donor device, and send the first F1-C connection of the migrating IAB node to the first F1-C connection.
  • the TNL address is updated to the second TNL address, so that the first F1-C is redirected on the side of the first Donor device, and the transmission path of the first F1-C is optimized.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrated IAB node sent by the second Donor device, and update the fifth TNL address of the F1-U connection of the migrated IAB node For the sixth TNL address, F1-U is redirected on the side of the first Donor device, and the transmission path of F1-U is optimized.
  • the first Donor device updates the first TNL address of the first F1-C connection of the migrating IAB node to the first TNL address of the first F1-C connection of the migrating IAB node.
  • the first Donor device can receive the second RRC reconfiguration message sent by the second Donor device for the UE serving the migrating IAB node; use the first TNL address to pass the second RRC reconfiguration message through the first F1 -C connection is sent to the migrating IAB node so that the migrating IAB node forwards the second RRC reconfiguration message to the UE it serves.
  • FIG. 11a and FIG. 11b are exemplary diagrams of application scenarios of the foregoing embodiment
  • FIG. 12 is a schematic diagram of information interaction of the foregoing embodiment. The above embodiment will be described below with reference to FIGS. 11 a , 11 b and 12 .
  • the migrating node switches from Donor 1 to Donor 2. Since it is switching to Donor 2, F1-C needs to be established with Donor 2 in the end.
  • New F1-C uses a new transmission path from migrating node to donor 2. Old F1-C may be updated from the original transmission path to the new transmission path. Since New F1-C is established through a new transmission path, the migrating node must first connect to Donor 1, and then establish New F1-C with Donor 2. The UE's handover complete (reconfiguration complete) message needs to be sent to Donor 2 through the new F1-C, so the migrating node migrates to Donor 2 before the UE.
  • the information exchange process includes:
  • Migrating node sends a measurement report to Donor CU 1
  • Donor CU 1 determines to initiate a handover request to Donor CU 2 according to the measurement report
  • Donor CU 1 sends the context of the migrating node and the UE it serves to Donor CU 2
  • Donor CU 2 is in
  • the IAB-node 2 establishes a context for the Migrating node, and then sends a handover request response to the Donor CU 1, which carries an RRCReconfiguration message.
  • the Donor CU 1 after receiving the handover request response, the Donor CU 1 sends an RRCReconfiguration message for the migrating node carried in the handover request response to the migrating node. Because the change is connected to donor 2, the message contains the BAP address assigned to the migrating node by donor 2. Since the backhaul link is changed to IAB-node 2, it also contains the BH RLC channel from migrating node to IAB-node 2. configuration, and BAP routing (default routing) and BH RLC channel (default BH channel) for F1-C and non-F1 data.
  • the access anchor of the Old F1 connection established between Donor CU 1 and migrating node is changed from IAB-node 1 to IAB-node 2
  • the original F1 data can pass through Donor DU 2 and IAB-node 2 under Donor 2 Forwarding, that is, the transmission is converted from the original path to the new path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU ⁇ Donor CU 1)
  • the migrating node needs to be configured with a subnet address adapted to Donor DU 2, so Donor CU 2 is migrating
  • the node updates the F1TNL address.
  • the RRC reconfiguration message to the UE may have been sent to the migrating node through the original F1-C at this time, so the original F1-C C may not need to move to the new path, so it is optional to include the TNL address of Old F1-C in the RRC reconfiguration message.
  • the DRB data of the UE is still sent to Donor CU1 through F1-U (that is, F1-U established between migrating node and Donor CU1), and F1-U is transferred from the original path to the new path (that is, migrating node).
  • the TNL address of F1-U can also be included in the message, indicating to update the transmission path of F1-U, so that the migrating node can immediately switch F1-U to the new path for transmission.
  • the RRC reconfiguration message can also be used to update the mapping relationship between the BAP route for F1-U and the BH RLC channel.
  • BAP routing and configure the correspondence between UE ID and UE's RLC channel to the backhaul RLC channel of the migrating node.
  • Scenario 2 UE does not migrate immediately after migrating node is switched to Donor 2, so New F1-C can be established after migrating node is completed for a period of time, then the TNL address of New F1-C is included in the subsequent RRC reconfiguration message, as shown in the figure RRC reconfiguration procedure after operation 1205 of 12.
  • the implementation of 1203 to 1211 is the same as that of 1003 to 1011 in FIG. 10 , and the description is omitted here. It should be noted that the old F1-C redirection is optional, and in the example of FIG. 12 , 1210 (that is, sending an RRC reconfiguration message to the UE through the old F1-C) can be performed immediately after 1201.
  • the second Donor device can configure the TNL address of the first F1-C connection through an RRC message, instructing to update the TNL address of the first F1-C connection, so that the first F1-C connection can pass through the second Donor device.
  • the DU is forwarded to optimize the transmission path of the first F1-C connection, or the second Donor device configures the TNL address of the second F1-C connection through an RRC message, so that the migrating IAB node is switched to the second Donor device immediately after the establishment of the second Donor device.
  • Two F1-C connections are made to migrate the UE to the second Donor device to achieve load balancing between the donors.
  • the migrating node when establishing the UE context in the second F1-C connection, the migrating node only needs to obtain the first context of the UE through the first context identifier of the UE in the first F1-C connection and reuse the first context to establish the UE's first context.
  • the second context does not need to use the existing UE context establishment message, which can reduce signaling overhead and delay in UE context establishment, and improve signaling efficiency.
  • the migrating IAB node switches from the first Donor device to the second Donor device, and the migrating node establishes the second F1-C connection before switching to the second Donor device.
  • the second Donor device causes the migrating IAB node to update the third TNL address for the second F1-C connection to the fourth TNL address.
  • the second Donor device sends the first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node.
  • the first RRC reconfiguration message contains a handover command and a fourth TNL address for the second F1-C connection.
  • the migrating IAB node can update the third TNL address of the second F1-C connection to the fourth TNL address.
  • the second Donor device configures the TNL address of the second F1-C connection through an RRC message, and instructs to update the TNL address of the second F1-C connection, so that the second F1-C connection can pass through the DU of the second Donor Forwarding is performed to optimize the transmission path of the second F1-C connection.
  • the above-mentioned first RRC reconfiguration message may further include: the BAP address allocated to the migrating IAB node; and/or, the backhaul RLC channel configuration of the migrating IAB node, and for F1-C and non-F1 data
  • the default BAP routing identifier and the default return RLC channel identifier and/or, for the migrating IAB node to update the fifth TNL address of its F1-U connection to the sixth TNL address of the sixth TNL address, so that the F1-U connection It can be forwarded through the DU of the second Donor; and/or, the BAP route identifier and the backhaul RLC channel identifier of the F1-U connection used to migrate the IAB node.
  • the CU of the second Donor device may use the third TNL address through the second F1-
  • the C connection sends a first message to the DU of the migrating IAB node, so that the migrating IAB node establishes a second context for the UE it serves according to the first message.
  • the first message may include the first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context to establish the second context of the UE.
  • the first message may be an F1 setup response or a UE context modification request message.
  • the first message may further include the serving cell configuration information of the UE, so that the migrating IAB node updates the serving cell configuration of the UE.
  • the migrating node only needs to obtain the first context of the UE according to the first context identifier and reuse the first context to establish the second context of the UE, without using the existing UE context establishment message, which can reduce the UE context Signaling overhead and delay during establishment to improve signaling efficiency.
  • the first Donor device before the migrating IAB node receives the first RRC reconfiguration message, the first Donor device also sends a third RRC reconfiguration message to the migrating IAB node, where the third RRC reconfiguration message contains information for the second F1- The third TNL address of the C connection.
  • the relocated IAB node can use the third TNL address to establish a second F1-C connection with the CU of the second Donor device, thereby realizing the relocation of the UE.
  • the second Donor device may also send a second RRC reconfiguration message for the UE served by the migrated IAB node to the first Donor device, so that the first Donor device uses the above-mentioned first TNL address
  • the second RRC reconfiguration message is forwarded to the migrating IAB node over the first F1-C connection. Therefore, after receiving the second RRC reconfiguration message, the migrating IAB node can send the second RRC reconfiguration message to the UE it serves.
  • the migrating IAB node may also receive the second RRC reconfiguration complete message sent by the UE it serves, and use the third TNL address or the fourth TNL address to use the second RRC reconfiguration complete message through the second F1-C connection Sent to the second Donor device.
  • the second Donor device can also receive that the migrating IAB node uses the aforementioned third TNL address to connect through the aforementioned second F1-C The second RRC reconfiguration complete message sent; or, after the relocation IAB node is switched, an RRC reconfiguration complete message for the UE served by the relocation IAB node is sent, and the second Donor device receives the relocation IAB node using the fourth TNL address through the second The second RRC reconfiguration complete message sent by the F1-C connection.
  • the first Donor device since the first Donor device allocates the third TNL address, the first Donor device may also send the third TNL address to the second Donor device for migrating the IAB node to establish the second F1-C connection. Thereby, the second Donor device can establish a second F1-C connection with the migrating IAB node.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrated IAB node sent by the second Donor device, and update the fifth TNL address of the F1-U connection of the migrated IAB node to The sixth TNL address is used to redirect F1-U on the side of the first Donor device to optimize the transmission path of F1-U.
  • FIGS. 13a and 13b are exemplary diagrams of application scenarios of the foregoing embodiments
  • FIG. 14 is a schematic diagram of information interaction of the foregoing embodiments. The above embodiment will be described below with reference to FIGS. 13 a , 13 b and 14 .
  • the migrating node switches from Donor 1 to Donor 2.
  • Donor 1 Same as the example of Figure 11a, Figure 11b and Figure 12, because it is switching to Donor 2, it is finally necessary to establish F1-C with Donor 2.
  • New F1-C is established through the original transmission path, and then the new transmission path is updated. Old F1-C may also be updated from the original transmission path to the new transmission path. Since New F1-C is established through the original transmission path, the migrating node needs to establish New F1-C before accessing Donor 2. In this case, the UE can migrate to donor 2 before the migrating node.
  • the information exchange process includes:
  • Migrating node sends a measurement report to Donor CU 1
  • Donor CU 1 determines to initiate a handover request to Donor CU 2 according to the measurement report
  • Donor CU 1 sends the context of the migrating node and the UE it serves to Donor CU 2
  • Donor CU 2 is in
  • the IAB-node 2 establishes a context for the Migrating node, and then sends a handover request response to the Donor CU 1, which carries an RRCReconfiguration message.
  • the Donor CU 1 sends the RRCReconfiguration message for the migrating node to the migrating node, which is used to establish the New F1-C.
  • the RRC reconfiguration message contains the TNL address for the New F1-C to indicate the establishment of the new F1-C.
  • the migrating node sends an RRC reconfiguration complete message to Donor CU 1.
  • New F1-C is established with Donor CU 2 through the original path (ie, migrating node ⁇ IAB-node 1 ⁇ Donor DU 1 ⁇ Donor CU 2), after Donor CU 1 receives the RRC reconfiguration of the migrating node, the The nodes on the original path configure the BH RLC channel, BAP layer routing, and BH RLC channel mapping relationship.
  • operation 1403 may be performed immediately after operation 1401, but the present application is not limited thereto.
  • the Migrating node establishes New F1-C with donor CU 2 using the TNL address instructing to establish New F1-C.
  • the UE in order to migrate the UE to donor 2, establish the context of the UE in the migrating node New F1-C.
  • the UE has a set of contexts in the Old F1-C and the New F1-C respectively, that is, for the UE, there is an F1AP signaling connection between the migrating node and the donor CU 1 and the donor CU 2 respectively.
  • the F1AP signaling connection with the donor CU1 is used to send an RRC reconfiguration message to the UE, and the F1AP signaling connection with the donor CU2 is used to receive the UE's RRC reconfiguration complete message.
  • Method 1 Donor CU 2 sends an F1AP message to the migrating node through New F1-C, that is, a UE context setup request.
  • the Migrating node can allocate a C-RNTI to the UE, and send the C-RNTI and the UE context setup response to the Donor CU 2.
  • the UE contxt setup request includes the F1-U configuration for the UE DRB, and the F1-U can be configured on the donor CU1 side.
  • the UE's DRB uses the UL TNL address of the Donor CU 1; it can also be configured on the donor DU 2.
  • the UE DRB uses the UL TNL address of Donor CU 2, and then the migrating node converts the UE's F1-U from Donor CU 1 to Donor CU 2.
  • Method 2 Donor CU2 sends an F1AP message to the migrating node through New F1-C, that is, UE context modification.
  • the UE context modification carries the context identifier of the UE in the Old F1-C
  • the migrating node can obtain the UE context in the Old F1-C according to the context identifier of the UE and use it to create a new UE in the New F1-C. context.
  • the UE context modification message can configure the serving cell identifier of the UE, and the migrating node replaces the serving cell identifier in the original UE context with the serving cell identifier.
  • the UE may change the C-RNTI when it migrates to a new serving cell, so the Migrating node allocates a new C-RNTI to the UE and replaces the original C-RNTI with the new C-RNTI.
  • the Migrating node sends the new C-RNTI to Donor CU2 through the UE context setup response. In this way, a new context is created by using the original UE context, which can save signaling overhead.
  • the F1-U configuration can be modified in the UE contxt modification.
  • the modified F1-U can still be on the donor CU1 side.
  • the DRB of the UE uses the UL TNL address of the Donor CU1; Switch from Donor CU 1 to donor DU 2.
  • the UE DRB uses the UL TNL address of Donor CU 2, and then the migrating node sends the UE's DRB data to Donor CU 2.
  • the F1-U of the UE is switched from Donor CU 1 to Donor CU 2, it is necessary to transmit F1-U with Donor CU 2 through the original path (that is, the transmission path is: migrating node ⁇ IAB-node 1 ⁇ Donor DU 1 ⁇ Donor CU 2).
  • Method 3 Donor CU 2 establishes a new UE context by sending an F1 setup response message (F1 Setup Response) when establishing a new F1-C with the migrating node.
  • F1 setup response message F1 Setup Response
  • the F1 Setup Response can carry the context identifiers of multiple UEs in the old F1-C, and the migrating node can obtain the UE context in the old F1-C according to the context identifiers of the UE and use it in the new F1-C. Create a new UE context.
  • the F1 Setup Response may also contain the serving cell identifiers of multiple UEs, and the migrating node replaces the serving cell identifiers in the original UE context with the cell identifiers. In this way, when F1 is established, a new context is created by using the original context of the UE, which saves the process of separately establishing each UE context, and can save signaling overhead and signaling delay.
  • Donor CU 1 Migrate the UE that established the context to Donor 2, and Donor CU 1 sends an RRC reconfiguration message to the UE through the Old F1-C.
  • operation 1406 may also be performed immediately after operation 1401, but the present application is not limited thereto.
  • the RRC reconfiguration sending path of the UE is Donor CU 1 ⁇ Donor DU 1 ⁇ IAB-node 1 ⁇ migrating node.
  • the UE can send the RRC reconfiguration completion to Donor CU 2 through New F1-C, since New F1-C is between the migrating node and Donor CU 2, passing through Donor DU 1 and IAB-node 1 under Donor 1 Forwarding, that is, the transmission path is: migrating node ⁇ IAB-node 1 ⁇ Donor DU 1 ⁇ Donor CU 2.
  • the Donor CU 2 After receiving the completion of the RRC reconfiguration of the UE, the Donor CU 2 initiates a core network path switch for the UE.
  • Donor CU 1 sends an RRCReconfiguration message for the migrating node carried in the handover request response to the migrating node to switch the migrating node to Donor 2, including the target cell and key update information under IAB-node 2.
  • the access anchor point of the F1 connection of the migrating node is changed from IAB-node 1 to IAB-node 2
  • the original F1 data needs to be forwarded through Donor DU 2 and IAB-node 2 under Donor 2, that is, the transmission is converted from the original path.
  • the migrating node needs to be configured with a subnet address suitable for Donor DU 2. Therefore, Donor CU 2 needs to update the TNL address of F1 for the migrating node.
  • To go to the new route for New F1-C update the TNL address of new F1-C.
  • the Old F1-C does not need to move to the new path.
  • operation 1410 may be performed immediately after operation 1401, but the present application is not limited thereto.
  • New F1-C uses the updated TNL address to convert New F1-C to the new path.
  • F1-U can also use the updated TNL address to convert F1-U to the new path.
  • the second Donor device configures the TNL address of the second F1-C connection through an RRC message before the switching of the migrating IAB node, so that the migrating IAB node establishes the second F1-C connection, thereby migrating the UE to the second Donor.
  • the device implements load balancing between donors, and at the same time configures the TNL address of the second F1-C connection through an RRC message when the IAB node is switched to instruct to update the TNL address of the second F1-C connection, so that the second F1-C connection It can be forwarded through the DU of the second Donor, which optimizes the transmission path of the second F1-C connection.
  • the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device, wherein the migrating node does not need to work as a DU under the second Donor device, that is, the UE served by the migrating IAB node There is no need to migrate to the second Donor device, and there is no need to establish a second F1-C to migrate the IAB node.
  • the second Donor device adds the second TNL address for the first F1-C connection for the migrating IAB node.
  • the second Donor device sends the first RRC reconfiguration message for the migrating IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrating IAB node.
  • the first RRC reconfiguration message contains secondary cell group (SCG) configuration information and a second TNL address for the first F1-C connection.
  • SCG secondary cell group
  • the migrating IAB node can add a second TNL address to the first F1-C connection.
  • the second Donor device configures the TNL address of the first F1-C connection through an RRC message to instruct to add the TNL address of the first F1-C connection, so that the first F1-C connection can pass through the first Donor at the same time Forwarding with the DU of the second Donor improves the forwarding flexibility of the first F1-C connection.
  • the first RRC reconfiguration message may further include: the BAP address allocated to the relocated IAB node; and/or, the backhaul RLC channel configuration for the secondary cell group of the relocated IAB node; and/or, BAP routing identification and backhaul RLC channel identification for the second F1-C connection; and/or, a sixth TNL address added for the F1-U connection of the migrating IAB node, so that the F1-U connection can pass through the first Donor at the same time and forwarding with the DU of the second Donor; and/or, the BAP routing identifier and the return RLC channel identifier of the F1-U connection used for migrating the IAB node.
  • the first Donor device may receive the second TNL address of the first F1-C connection of the migrated IAB node sent by the second Donor device, and add the second TNL address to the first F1-C connection of the migrated IAB node TNL address, so as to redirect the first F1-C on the first Donor device side, and increase the transmission path of the first F1-C.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrating IAB node sent by the second Donor device, and add the sixth TNL address to the F1-U connection of the migrating IAB node.
  • the first Donor device may send a second message to the migrating IAB node over the first F1-C connection using the first TNL address or using the second TNL address, the second message may include a sixth TNL for the F1-U connection address; and/or, the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection.
  • FIG. 15 is an example diagram of an application scenario of the foregoing embodiment
  • FIG. 16 is a schematic diagram of information interaction of the foregoing embodiment. The above embodiment will be described below with reference to FIG. 15 and FIG. 16 .
  • the migrating node moves from Donor 1 to Donor 2, a new transmission path is added to maintain a dual-connection with Donor 1 and Donor 2, that is, an SCG connection is established with Donor 2.
  • the connection with Donor 1 becomes the MCG connection.
  • the migrating IAB node does not establish F1-C with Donor 2, and F1-C 2 adds a new transmission path (or updates to the new transmission path).
  • the F1AP messages of some UEs are transmitted through the original path, and the F1AP messages of some UEs are updated to the new path for transmission.
  • the information exchange process includes:
  • Migrating node sends a measurement report to Donor CU 1
  • Donor CU 1 determines to initiate a request to add Secondary node to Donor CU 2 according to the measurement report, and Donor CU 1 sends Donor CU 2 the context of the migrating node and the UE it serves
  • Donor CU 2 2 Establish a context for the Migrating node in IAB-node 2, and then send a response to the request to add a Secondary node to Donor CU 1, which carries an RRCReconfiguration message.
  • the message contains the BAP address assigned by Donor 2 to the migrating node.
  • the two transmission modes for F1-C through the new path are:
  • Mode 1 transmit F1-C through signaling access bearer SRB;
  • Mode 2 F1-C is transmitted through the BH RLC channel.
  • the message also includes the BH RLC channel configuration from migrating node to IAB-node 2.
  • this message also adds (or updates) BAP routing and BH RLC for F1-C and non-F1 data channel configuration.
  • IAB-node 2 is to be added as the access anchor of F1 connection (or the access anchor is switched to IAB-node 2)
  • F1 data is forwarded through Donor DU 2 and IAB-node 2 under Donor 2, and it is necessary to provide
  • the migrating node configuration is adapted to the subnet address of Donor DU 2. Therefore, Donor CU 2 needs to add the TNL address of F1-C to the migrating node to increase the transmission path of F1-C.
  • the F1AP signaling of the UE is sent to the Donor CU 1 through the Old F1-C. After the F1-C adds a transmission path, the signaling of some UEs is sent through the original path, and the signaling of some UEs can be sent through the new path.
  • the F1-U of some UEs or all UEs are also transferred from the original path to the new path (migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1 or Donor CU2).
  • the RRC message can also include the TNL address of the F1-U, so that the migrating node can immediately switch the F1-U to the new path for transmission.
  • the mapping relationship between the BAP route for F1-U and the BH RLC channel can also be configured. For example, specifically, configure the BAP route used by the RLC channel of each UE in the message, and configure the UE ID, UE's The correspondence between the RLC channel and the return RLC channel of the migrating node.
  • the Migrating node sends the RRC reconfiguration completion to Donor CU 1, and the Donor CU 1 sends the Secondary node reconfiguration completion to Donor CU 2.
  • Donor CU 2 initiates a core network path update for the migrating node after receiving the completion of the secondary node reconfiguration and the random access of the migrating node.
  • Donor CU 2 updates the BH RLC channel for the node on the new path after receiving the secondary node reconfiguration complete message and the random access of the migrating node.
  • Configuration, BAP layer routing and BH RLC channel mapping relationship configuration because the data of F1-C and F1-U of the migrating node need to be transmitted through the new path.
  • operation 1605 may be performed immediately after operation 1601, but the present application is not limited thereto.
  • F1-C is transmitted through the signaling access bearer SRB from migrating node to IAB-node 2; or F1-C is transmitted through the BH RLC channel from migrating node to IAB-node 2.
  • 1602 contains the TNL configuration of the F1-U, add a TNL address for the F1-U, and convert the F1-U part of the UE DRB to the new path.
  • the second Donor device configures the TNL address of the first F1-C connection through an RRC message to instruct to add the TNL address of the first F1-C connection, so that the first F1-C connection can pass through the first Donor at the same time Forwarding with the DU of the second Donor improves the forwarding flexibility of the first F1-C connection.
  • the migrating IAB node maintains the connection with the first Donor device and adds an air interface connection with the second Donor device, and the migrating IAB node establishes the second F1-C after adding the air interface connection with the second Donor device.
  • the second Donor device configures the migrating IAB node with the fourth TNL address or the third TNL address used for establishing the second F1-C connection, or the second Donor device adds the third TNL address for the first F1-C connection for the migrating IAB node. Two TNL addresses.
  • the second Donor device sends the first RRC reconfiguration message for the migrating IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrating IAB node.
  • the first RRC reconfiguration message contains secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address for the second F1-C connection, whereby the migrating IAB node can use the fourth TNL address or The third TNL address establishes a second F1-C connection with the CU of the second Donor device; or, the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a second F1-C connection for the first F1-C connection. TNL address, whereby the migrating IAB node can add a second TNL address to the first F1-C.
  • SCG secondary cell group
  • the second Donor device configures the TNL address of the first F1-C connection through an RRC message, and instructs to update the TNL address of the first F1-C connection, so that the first F1-C connection can pass through the DU of the second Donor Forwarding is performed to optimize the transmission path of the first F1-C connection.
  • the second Donor device can configure the TNL address of the second F1-C connection through an RRC message, so that the migrating IAB node adds an air interface connection to the second Donor device.
  • the second F1-C connection is established immediately, so that the relocation of the UE can be realized.
  • the first RRC reconfiguration message may further include: the BAP address allocated to the relocated IAB node; and/or the backhaul RLC channel configuration for the secondary cell group of the relocated IAB node; for the second F1- The BAP routing identifier and the return RLC channel identifier of the C connection; the sixth TNL address added for the F1-U connection of the migrating IAB node, so that the F1-U connection can be forwarded through the DUs of the first Donor and the second Donor at the same time; use BAP routing identifier and backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the second Donor device may also send a third RRC reconfiguration message to the migrating IAB node, where the third RRC reconfiguration message includes a The fourth TNL address connected to the second F1-C. Therefore, after receiving the third RRC reconfiguration message, the migrating IAB node can establish a second F1-C connection with the CU of the second Donor device using the above-mentioned fourth TNL address.
  • the CU of the second Donor device can use the above-mentioned third TNL address or the above-mentioned fourth TNL address to send a first message to the migrating IAB node through the second F1-C connection, so that the migrating IAB node establishes a second context for the UE it serves according to the first message.
  • the above-mentioned first message includes the first context identifier of the UE, so that the migrating IAB node obtains the first context of the above-mentioned UE according to the first context identifier and reuses the first context to establish the second context of the UE;
  • a message may be an F1 setup response or a UE context modification request message.
  • the above-mentioned first message further includes the serving cell configuration information of the UE, so that the migrating IAB node updates the serving cell configuration of the above-mentioned UE.
  • the migrating node only needs to obtain the first context of the UE according to the first context identifier and reuse the first context to establish the second context of the UE, without going through the existing UE context establishment process, which can reduce the UE context Signaling overhead and delay during establishment to improve signaling efficiency.
  • the second Donor device when migrating the UE, may also send a second RRC reconfiguration message for the UE served by the migrated IAB node to the first Donor device, so that the first Donor device uses the above-mentioned first TNL address or The above-mentioned second TNL address forwards the second RRC reconfiguration message to the migrating IAB node through the first F1-C connection. Therefore, after receiving the second RRC reconfiguration message, the migrating IAB node can send the second RRC reconfiguration message to the UE it serves.
  • the migrating IAB node may also receive the second RRC reconfiguration complete message sent by the UE it serves, and use the third TNL address or the fourth TNL address to use the second RRC reconfiguration complete message through the second F1-C connection Sent to the second Donor device.
  • the second Donor device can also receive the second RRC reconfiguration complete message sent by the relocated IAB node using the above-mentioned third TNL address through the second F1-C connection; or, receive the above-mentioned fourth TNL address by the relocated IAB node The second RRC reconfiguration complete message sent through the second F1-C connection.
  • the first Donor device may also send the third TNL for migrating the second F1-C connection of the IAB node to the second Donor device address.
  • the second Donor device can establish a second F1-C connection with the migrating IAB node.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrating IAB node sent by the second Donor device, and add a sixth TNL address for the F1-U connection of the migrating IAB node.
  • the first Donor device may send a second message to the migrating IAB node over the first F1-C connection using the first TNL address or using the second TNL address, the second message may include a sixth TNL for the F1-U connection address; and/or, the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection.
  • the migrating IAB node can update the fifth TNL address of its F1-U connection to the sixth TNL address, so that the first Donor device side adds a transmission path of the F1-U connection, and the transmission of the F1-U connection is more flexible.
  • the first A Donor device may also send a third RRC reconfiguration message to the migrating IAB node, where the third RRC reconfiguration message includes the above-mentioned third TNL address.
  • the migrating IAB node may establish a second F1-C connection with the CU of the second Donor device.
  • FIGS. 17a and 17b are exemplary diagrams of application scenarios of the foregoing embodiment
  • FIG. 18 is a schematic diagram of information interaction of the foregoing embodiment. The above embodiment will be described below with reference to FIGS. 17 a , 17 b and 18 .
  • the Migrating node when the migrating node moves from Donor 1 to Donor 2, a new transmission path is added, maintaining a dual-connection with Donor 1 and Donor 2, that is, establishing a dual-connection with Donor 2
  • the SCG connection the connection with Donor 1 becomes the MCG connection.
  • the Migrating node establishes New F1-C with Donor 2 through the new transmission path or the original path.
  • Old F1-C can add a new transmission path.
  • the migrating node first establishes an SCG connection with donor 2, and then establishes New F1-C. Since the UE's handover completion message needs to be sent to donor 2 through New F1-C, the UE can only migrate to donor 2 after the migrating node establishes an SCG connection with donor 2.
  • the information exchange process includes:
  • Migrating node sends a measurement report to Donor CU 1
  • Donor CU 1 determines to initiate a request to add Secondary node to Donor CU 2 according to the measurement report, and Donor CU 1 sends Donor CU 2 the context of the migrating node and the UE it serves
  • Donor CU 2 2 Establish a context for the Migrating node in IAB-node 2, and then send a response to the request to add a Secondary node to Donor CU 1, which carries an RRCReconfiguration message.
  • the Donor CU 1 after receiving the response to the request for adding a secondary node, the Donor CU 1 sends an RRCReconfiguration message for the migrating node carried in the response to the migrating node.
  • New F1-C (New F1-C) can be established through a new transmission path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2), and the backhaul link from migrating node to IAB-node 2 needs to be added, so the message is still Contains the BH RLC channel configuration from migrating node to IAB-node 2; since a new transmission path needs to be added (ie migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1), this message is also added (or updated) with BAP routing and BH RLC channel configuration for F1-C and non-F1 data. If the Old F1-C is transmitted through the new path, there are two transmission methods:
  • Mode 2 F1-C is transmitted through the BH RLC channel.
  • the Old F1 data is forwarded through Donor DU 2 and IAB-node 2 under Donor 2, and Donor 2 configures the migrating node to adapt to the subnet address of Donor DU 2 . Therefore, Donor CU 2 adds the TNL address of Old F1-C to the migrating node.
  • the F1AP signaling of the UE is sent through the Old F1-C. After the Old F1-C adds a transmission path, part of the UE's signaling can be sent through the original path, and part of the UE's signaling can be sent through the new path.
  • the F1-U of some or all UEs are also transferred from the original path to the new path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1 or Donor CU2).
  • the RRC message can also include the TNL address of the F1-U, so that the migrating node can immediately switch the F1-U to the new path for transmission.
  • the mapping relationship between the BAP route for F1-U and the BH RLC channel can also be configured. For example, specifically, configure the BAP route used by the RLC channel of each UE in the message, and configure the UE ID, UE's The correspondence between the RLC channel and the return RLC channel of the migrating node.
  • Scenario 1 The new F1-C is established immediately after the migrating node is connected to Donor 2. Then the above RRC reconfiguration message also includes the TNL address of the new F1-C to indicate the establishment of the new F1-C.
  • the Migrating node sends the RRC reconfiguration to Donor CU 1 to complete, and the Donor CU 1 sends the Secondary node to Donor CU 2 to complete the reconfiguration.
  • Donor CU 2 initiates a core network path update for the migrating node after receiving the completion of the secondary node reconfiguration and the random access of the migrating node.
  • Donor CU2 receives the secondary node reconfiguration completion message, that is, the random access of the migrating node, to the new Nodes on the path update BH RLC channel configuration, BAP layer routing, and BH RLC channel mapping relationship configuration.
  • operation 1805 may be performed immediately after operation 1801, but the present application is not limited thereto.
  • the Old F1-C transmits through the original path and the new path at the same time, the Old F1-C increases the TNL address, and part or all of the UE signaling in the Old F1-C is converted to the new path.
  • Old F1-C is transmitted through the signaling access bearer SRB from migrating node to IAB-node 2; or, Old F1-C is transmitted through the BH RLC channel from migrating node to IAB-node 2.
  • the Donor CU 1 sends an F1AP message to the migrating node through the Old F1-C, that is, UE context modification.
  • the TNL address of F1-U is increased through this message, so that F1-U can add a new path, and the BAP route and BH RLC channel mapping relationship of F1-U can also be modified through this message.
  • configure the RLC of each UE The BAP route used by the channel, and the corresponding relationship between the configured UE ID and the UE's RLC channel to the backhaul RLC channel of the migrating node.
  • operation 1809 may be performed immediately after operation 1805, but the present application is not limited thereto.
  • the context of the UE is established in the New F1-C of the migrating node, so that the UE has a set of contexts in the Old F1-C and the New F1-C respectively, that is, for the UE, the migrating node and the donor
  • the F1AP signaling connection with the donor CU1 is used to send an RRC reconfiguration message to the UE
  • the F1AP signaling connection with the donor CU2 is used to receive the UE's RRC reconfiguration complete message.
  • Donor CU 2 sends F1AP message UE context setup request to migrating node through New F1-C to establish a new UE context.
  • the Migrating node allocates a C-RNTI to the UE, and sends the C-RNTI and the UE context setup response to the Donor CU2.
  • the UE contxt setup includes the F1-U configuration for the UE DRB, and the F1-U can be configured on the donor CU1 side.
  • the UE's DRB uses the UL TNL address of the Donor CU 1; it can also be configured on the donor DU 2 side.
  • the UE DRB uses the UL TNL address of Donor CU 2, and then the migrating node switches the UE's F1-U from Donor CU 1 to Donor CU 2.
  • the UE context modification carries the context identifier of the UE in the Old F1-C
  • the migrating node can obtain the UE context in the Old F1-C according to the context identifier of the UE and use it to create a new UE in the New F1-C. context.
  • the UE may change the C-RNTI when it changes the serving cell, so the Migrating node allocates a new C-RNTI to the UE and replaces the original C-RNTI with the new C-RNTI.
  • the Migrating node sends the new C-RNTI to Donor CU2 along with the UE context setup response. In this way, a new context is created by using the original UE context, which can save signaling overhead.
  • Method 3 Donor CU2 establishes a new context of the UE by sending an F1 setup response message (F1 Setup Response) when establishing a new F1-C with the migrating node.
  • F1 setup response message F1 Setup Response
  • the F1 Setup Response can carry the context identifiers of multiple UEs in the old F1-C, and the migrating node can obtain the UE context in the old F1-C according to the context identifiers of the UE and use it in the new F1-C. Create a new context for the UE.
  • the F1 Setup Response may also contain the serving cell identifiers of multiple UEs, and the migrating node replaces the serving cell identifiers in the original UE context with the cell identifiers. In this way, when F1 is established, a new context is created by using the original context of the UE, which saves the process of establishing a context for each UE individually, and can save signaling overhead and signaling delay.
  • operation 1811 may be performed immediately after operation 1801, but the present application is not limited thereto.
  • Old F1-C can be forwarded through the original path or through the new path.
  • the sending path of the UE's RRC reconfiguration message is Donor CU 2 ⁇ Donor CU 1 ⁇ Donor DU 2 ⁇ IAB-node 2 ⁇ migrating node.
  • the RRC reconfiguration completion message of the UE after migration is forwarded to Donor CU 2 through the original path or new path of New F1-C, for example, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU 2.
  • the Donor CU 2 after receiving the completion of the RRC reconfiguration of the UE, the Donor CU 2 initiates a core network path switch for the UE.
  • the migrating node when establishing the UE context in the second F1-C connection, the migrating node only needs to obtain the first context of the UE through the first context identifier of the UE in the first F1-C connection and reuse the first context to establish the UE's first context.
  • the second context does not need to use the existing UE context establishment message, which can reduce signaling overhead and delay in UE context establishment, and improve signaling efficiency.
  • the migrating IAB node maintains the air interface connection with the first Donor device and adds the air interface connection with the second Donor device, and the migrating node establishes the second F1-C connection before adding the air interface connection with the second Donor device.
  • the second Donor device adds a fourth TNL address for the second F1-C connection for the migrating IAB node; alternatively, adds a fourth TNL address for the second F1-C connection for the migrating IAB node, and adds a fourth TNL address for the migrating IAB node Second TNL address for the first F1-C connection.
  • the second Donor device sends the first RRC reconfiguration message for the migrating IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrating IAB node.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address for the second F1-C connection, whereby the migrating IAB node can add a fourth TNL address for the second F1-C connection ; or, the first RRC reconfiguration message includes secondary cell group (SCG) configuration information, a fourth TNL address for the second F1-C connection, and a second TNL address for the first F1-C connection, thereby , the migrating IAB node may add a fourth TNL address for the second F1-C connection and a second TNL address for the first F1-C.
  • SCG secondary cell group
  • the second Donor device configures the TNL address of the second F1-C connection through an RRC message, and instructs to add the TNL address of the second F1-C connection, so that the second F1-C connection can pass through the first Donor and the second F1-C connection at the same time.
  • the DU of the second Donor is forwarded, which improves the forwarding flexibility of the second F1-C; in addition, the second Donor also configures the TNL address of the first F1-C connection through an RRC message, instructing to add the first F1-C connection TNL address, so that the first F1-C connection can be forwarded through the DUs of the first Donor and the second Donor at the same time, which improves the forwarding flexibility of the second F1-C.
  • the first RRC reconfiguration message may further include: the BAP address allocated to the relocated IAB node; and/or the backhaul RLC channel configuration for the secondary cell group of the relocated IAB node; for the second F1- The BAP routing identifier and the return RLC channel identifier of the C connection; the sixth TNL address added for the F1-U connection of the migrating IAB node, so that the F1-U connection can be forwarded through the DUs of the first Donor and the second Donor at the same time; use BAP routing identifier and backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the CU of the second Donor device may also use the foregoing third TNL address or the foregoing fourth TNL address
  • a first message is sent to the DU of the migrating IAB node through the second F1-C connection, so that the migrating IAB node establishes a second context for the UE it serves according to the first message.
  • the first message includes the first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context to establish the second context of the UE.
  • the first message may be an F1 setup response or a UE context modification request message.
  • the first Donor device before the migrating IAB node receives the above-mentioned first RRC reconfiguration message, the first Donor device further sends a third RRC reconfiguration message to the migrating IAB node, where the third RRC reconfiguration message includes information for the first RRC reconfiguration message.
  • Second TNL address of the F1-C connection Therefore, after receiving the third RRC reconfiguration message, the migrating IAB node can use the third TNL address to establish a second F1-C connection with the CU of the second Donor device, thereby realizing the migration of the UE.
  • the relocated IAB node can also receive a second RRC reconfiguration complete message sent by the UE served by the relocated IAB node.
  • the third TNL address sends the second RRC reconfiguration complete message to the second Donor device through the second F1-C connection; if the second RRC reconfiguration for the UE served by the IAB node is sent after the relocation node adds the air interface connection completion message, the second RRC reconfiguration completion message is sent to the second Donor device through the second F1-C connection using the third TNL address or the fourth TNL address.
  • the first Donor device since the first Donor device allocates the third TNL address, the first Donor device may also send the third TNL address used for migrating the second F1-C connection of the IAB node to the second Donor device . Thereby, the second Donor device can establish a second F1-C connection with the migrating IAB node.
  • the first Donor device may send to the second Donor device the third TNL address used for migrating the second F1-C connection of the IAB node, and receive the address sent by the second Donor device for The second TNL address of the first F1-C connection of the migrating IAB node is migrated, and the second TNL address is added for the first F1-C connection of the migrating IAB node.
  • the second Donor device can establish a second F1-C connection with the migrating IAB node, and increase the transmission path of the first F1-C on the side of the first Donor device, thereby improving the flexibility of forwarding the first F1-C.
  • the first Donor device may also receive the sixth TNL address of the F1-U connection of the migrating IAB node sent by the second Donor device, and add a sixth TNL address for the F1-U connection of the migrating IAB node.
  • the first Donor device may send a second message to the migrating IAB node over the first F1-C connection using the first TNL address or using the second TNL address, the second message may include a sixth TNL for the F1-U connection address; and/or, the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection. Therefore, the migrating IAB node can update the fifth TNL address of its F1-U connection to the sixth TNL address, and increase the F1-U transmission path on the first Donor device side, thereby improving the flexibility of F1-U forwarding.
  • Fig. 19a and Fig. 19b are exemplary diagrams of application scenarios of the foregoing embodiment
  • Fig. 20 is a schematic diagram of information interaction of the foregoing embodiment. The above-mentioned embodiment will be described below with reference to FIGS. 19 a , 19 b and 20 .
  • the information exchange process includes:
  • the Migrating node sent a measurement report to Donor CU 1, and Donor CU 1 determined to initiate a request to add a Secondary node to Donor CU 2 according to the measurement report.
  • Donor CU 1 would send Donor CU 2 the context of the migrating node and the UE it served, and Donor CU 2 2 Establish a context for the Migrating node in IAB-node 2, and then send a response to the request to add a Secondary node to Donor CU 1, which carries the RRCReconfigurationg message.
  • Migrating node established New F1-C with donor CU 2 using the TNL address instructed to establish New F1-C.
  • New F1-C has two types of transmission through the new path, namely:
  • F1-C is transmitted through the BH RLC channel.
  • the context of the UE was established in the New F1-C of the migrating node, so that the UE has a set of contexts in the original F1-C and the new F1-C respectively, that is, for the UE, the migrating node and the donor CU
  • the F1AP signaling connection with the donor CU1 is used to send an RRC reconfiguration message to the UE
  • the F1AP signaling connection with the donor CU2 is used to receive the UE's RRC reconfiguration complete message.
  • Donor CU 2 sends an F1AP message, that is, a UE context setup request (UE context setup request), to the migrating node through New F1-C to establish a new context for the UE.
  • F1AP message that is, a UE context setup request (UE context setup request)
  • the Migrating node allocates a C-RNTI to the UE, and sends the C-RNTI and the UE context setup response to the Donor CU2.
  • the UE contxt setup includes the F1-U configuration for the UE DRB, and the F1-U can be configured on the donor CU1 side.
  • the UE's DRB uses the UL TNL address of the Donor CU 1; it can also be configured on the donor DU 2 side.
  • the UE DRB uses the UL TNL address of Donor CU 2
  • the migrating node converts the UE's F1-U from Donor CU 1 to Donor CU 2.
  • Donor CU2 sends an F1AP message to the migrating node through New F1-C, that is, UE context modification (UE context modification) to establish a new UE context.
  • UE context modification UE context modification
  • the UE context modification carries the context identifier of the UE in the Old F1-C
  • the migrating node can obtain the UE context in the Old F1-C according to the context identifier of the UE and use it to create a new UE in the New F1-C. context.
  • the UE context modification message can configure the serving cell identifier of the UE, and the migrating node replaces the serving cell identifier in the original UE context with the cell identifier.
  • the UE may change the C-RNTI when it changes the serving cell, so the Migrating node allocates a new C-RNTI to the UE and replaces the original C-RNTI with the new C-RNTI.
  • the Migrating node sends the new C-RNTI to Donor CU2 through the UE context setup response. In this way, a new context is created by using the original UE context, which can save signaling overhead.
  • the F1-U configuration can be modified in the UE contxt modification.
  • the modified F1-U can still be on the donor CU1 side.
  • the DRB of the UE uses the UL TNL address of the Donor CU1; Switch from Donor CU 1 to donor DU 2.
  • the UE DRB uses the UL TNL address of Donor CU 2, and then the migrating node sends the UE's DRB data to Donor CU 2.
  • the F1-U of the UE is switched from the Donor CU 1 to the Donor CU 2, the F1-U needs to be transmitted through the original path and the Donor CU 2, that is, the transmission path is: migrating node ⁇ IAB-node 1 ⁇ Donor DU 1 ⁇ Donor CU 2.
  • Method 3 Donor CU2 establishes a new context for the UE by sending an F1 setup response message (F1 Setup Response) when establishing a new F1-C with the migrating node.
  • F1 setup response message F1 Setup Response
  • the F1 Setup Response can carry the context identifiers of multiple UEs in the old F1-C, and the migrating node can obtain the UE context in the old F1-C according to the context identifiers of the UE and use it in the new F1-C. Create a new UE context.
  • the F1 Setup Response may also include the serving cell identifiers of multiple UEs, and the migrating node replaces the serving cell identifier in the original UE context with the cell identifier of the UE. In this way, when F1 is established, a new context is created by using the original context of the UE, which saves the process of separately establishing each UE context, and can save signaling overhead and signaling delay.
  • Donor CU 1 sent an RRC reconfiguration message to the UE through the original path of Old F1-C, namely Donor CU 1 ⁇ Donor DU 1 ⁇ IAB-node 1 ⁇ migrating node.
  • operation 2006 may be performed immediately after operation 2001, but the present application is not limited thereto.
  • the UE sends the RRC reconfiguration completion to Donor CU 2 through New F1-C. If the RRC reconfiguration completion is sent before adding a new air interface connection, it must go through Donor DU 1 and IAB-node 1 under Donor 1. Forwarding, that is, the transmission path is: migrating node ⁇ IAB-node 1 ⁇ Donor DU 1 ⁇ Donor CU 2; if the RRC reconfiguration is completed after adding a new air interface connection, it can be forwarded through the DUs of Donor 1 and Donor2 at the same time.
  • Donor CU 2 After receiving the RRC reconfiguration of the UE, Donor CU 2 initiates a core network path switch for the UE.
  • Donor CU 1 sent the RRCReconfiguration message carried in the response to the request to increase the secondary node to the migrating node.
  • the message contains the BAP address assigned by Donor 2 to the migrating node.
  • New F1-C is transmitted through the new transmission path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2), adding a backhaul link from migrating node to IAB-node 2, so the message also includes from migrating node to IAB-node 2 BH RLC channel configuration for node 2.
  • this message also adds (or updates) BAP routing and routing for F1-C and non-F1 data due to the need to add new transmission paths (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1).
  • BH RLC channel configuration ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1.
  • Mode 1 transmit F1-C through signaling access bearer SRB;
  • Mode 2 F1-C is transmitted through the BH RLC channel.
  • F1 data is forwarded through Donor DU 2 and IAB-node 2 under Donor 2, and the migrating node needs to be configured with a subnet address suitable for Donor DU 2. Therefore, Donor CU 2 needs to add the TNL address of F1-C to the migrating node.
  • the UE's F1AP signaling is sent through the New F1-C
  • the TNL address should be added to the New F1-C
  • the new F1-C should add a path
  • part of the UE's signaling can be sent through the original path, and some UE's signaling can be sent through the original path.
  • the new route is sent.
  • the F1-U of some or all UEs are also transferred from the original path to the new path (ie, migrating node ⁇ IAB-node 2 ⁇ Donor DU 2 ⁇ Donor CU1 or Donor CU2).
  • the RRC message can also include the TNL address of the F1-U, so that the migrating node can immediately switch the F1-U to the new path for transmission.
  • the mapping relationship between the BAP route for F1-U and the BH RLC channel can also be configured. For example, specifically, configure the BAP route used by the RLC channel of each UE in the message, and configure the UE ID, UE's The correspondence between the RLC channel and the return RLC channel of the migrating node.
  • the Migrating node sent the RRC reconfiguration to Donor CU 1 to complete, and Donor CU 1 sent the Secondary node to Donor CU 2 to complete the reconfiguration.
  • Donor CU 2 initiated the core network path update for the migrating node after receiving the reconfiguration of the Secondary node and the random access of the migrating node.
  • Donor CU 2 updates the nodes on the new path after receiving the secondary node reconfiguration completion message, that is, the random access of the migrating node.
  • BH RLC channel configuration, BAP layer routing and BH RLC channel mapping relationship configuration
  • operation 2011 may be performed immediately after operation 2001, but the present application is not limited thereto.
  • New F1-C added TNL address, and part of UE signaling or all UE signaling of New F1-C was converted to the new path. If the Old F1-C can be transmitted through the new path, the Old F1-C increases the TNL address, and part or all of the UE signaling of the Old F1-C is converted to the new path.
  • the second Donor device configures the TNL address of the second F1-C connection through an RRC message, instructing to add the TNL address of the second F1-C connection,
  • the second F1-C connection can be forwarded through the DUs of the first Donor and the second Donor at the same time, which improves the forwarding flexibility of the second F1-C;
  • the second Donor device also configures the first F1-C through an RRC message
  • the TNL address of the connection indicates adding the TNL address of the first F1-C connection, so that the first F1-C connection can be forwarded through the DUs of the first Donor and the second Donor at the same time, which improves the forwarding flexibility of the second F1-C.
  • the migrating node when establishing the UE context in the second F1-C connection, the migrating node only needs to obtain the first context of the UE through the first context identifier of the UE in the first F1-C connection and reuse the first context to establish the UE's first context.
  • the second context does not need to use the existing UE context establishment message, which can reduce signaling overhead and delay in UE context establishment, and improve signaling efficiency.
  • An embodiment of the present application provides a group migration apparatus.
  • the group migration apparatus 2100 includes:
  • the processing unit 2101 when migrating the IAB node from the first Donor and moving to the second Donor device, the second Donor device performs at least one of the following processes:
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1-C connection is the DU of the migrated IAB node and the CU of the first Donor device.
  • F1 connection between the CUs of the second Donor device, the first TNL address and the third TNL address are TNL addresses routable to the DUs of the first Donor device, the second TNL address and
  • the fourth TNL address is the TNL address of the DU routable to the second Donor device.
  • the migration of the IAB node from the first Donor device to the second Donor device refers to one of the following situations:
  • Scenario 1 when the relocated IAB node has a radio link failure on the backhaul RLC link under the first Donor device, it is re-established to the second Donor device;
  • the processing unit 2101 performs the following processing:
  • a fourth TNL address for establishing a second F1-C connection is configured for the migrating IAB node.
  • the processing unit 2101 sends a first RRC reconfiguration message to the migrated IAB node, where the first RRC reconfiguration message includes a second TNL address for the first F1-C connection, or the first RRC reconfiguration message contains a second TNL address for the first F1-C connection and a second TNL address for the second F1 - The fourth TNL address of the C connection.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the processing unit sends a third RRC reconfiguration message to the IAB node, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the processing unit 2101 (eg, the CU configured in the second Donor device) uses the The fourth TNL address sends a first message to the DU of the migrating IAB node through the second F1-C connection, so that the migrating IAB node establishes a second context for the UE it serves.
  • the first message includes the first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context establishment the second context.
  • the first message further includes serving cell configuration information of the UE.
  • the processing unit 2101 sends a second RRC reconfiguration message for the UE served by the migrating IAB node to the first Donor device, so that the first Donor device uses the second TNL address
  • the second RRC reconfiguration message is forwarded to the migrating IAB node through the first F1-C connection; in addition, the processing unit 2101 further receives that the migrating IAB node uses the fourth TNL address to pass the The second RRC reconfiguration complete message sent by the second F1-C connection.
  • the processing unit 2101 performs the following processing:
  • a fourth TNL address for establishing the second F1-C connection is configured for the migrating IAB node, and the migrating IAB node is caused to update the first TNL address of the first F1-C connection to the second TNL address.
  • the processing unit 2101 sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node an RRC reconfiguration message;
  • the first RRC reconfiguration message includes a handover command and a fourth TNL address for the second F1-C connection, or the first RRC reconfiguration message includes a handover command and a fourth TNL address for the second F1-C connection The second TNL address of the first F1-C connection.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the The processing unit 2101 sends a third RRC reconfiguration message to the migrating IAB node, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the processing unit 2101 uses the The fourth TNL address sends a first message to the DU of the migrating IAB node through the second F1-C connection, so that the migrating IAB node establishes a second context for the UE it serves.
  • the first message further includes serving cell configuration information of the UE.
  • the processing unit 2101 sends a second RRC reconfiguration message for the UE served by the migrating IAB node to the first Donor device, so that the first Donor device uses the second TNL address Or use the first TNL address to forward the second RRC reconfiguration message to the migrated IAB node through the first F1-C connection;
  • the second Donor device performs the following processing:
  • the migrating IAB node is caused to update the third TNL address for the second F1-C connection to the fourth TNL address.
  • the processing unit 2101 sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node
  • the first RRC reconfiguration message further includes at least one of the following:
  • the processing unit 2101 (for example, configured in the second Donor The CU) of the device sends a first message to the migrating IAB node DU over the second F1-C connection using the third TNL address, so that the migrating IAB node establishes a second context for the UE it serves.
  • the first message includes a first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context establishment the second context.
  • the first message further includes serving cell configuration information of the UE.
  • the processing unit 2101 performs the following processing:
  • a second TNL address for the first F1-C connection is added for the migrating IAB node.
  • the processing unit 2101 sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node
  • An RRC reconfiguration message; the first RRC reconfiguration message contains secondary cell group (SCG) configuration information and a second TNL address for the first F1-C connection.
  • SCG secondary cell group
  • the first RRC reconfiguration message further includes at least one of the following:
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the processing unit 2101 performs the following processing:
  • a second TNL address for the first F1-C connection is added for the migrating IAB node.
  • the processing unit 2101 sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node
  • An RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address for the second F1-C connection, or the first RRC
  • the reconfiguration message contains Secondary Cell Group (SCG) configuration information and a second TNL address for the first F1-C connection.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the processing unit 2101 sends a third RRC reconfiguration message to the migrating IAB node, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the processing unit 2101 uses the The third TNL address or the fourth TNL address sends a first message to the migrating IAB node through the second F1-C connection, so that the migrating IAB node establishes a second context for the UE it serves.
  • the first message includes a first context identifier of the UE, so that the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context establishment the second context.
  • the first message further includes serving cell configuration information of the UE.
  • the processing unit 2101 sends a second RRC reconfiguration message for the UE to the first Donor device, so that the first Donor device uses the first TNL address or the second RRC reconfiguration message
  • the TNL address forwards the second RRC reconfiguration message to the migrating IAB node through the first F1-C connection; the processing unit 2101 further receives that the migrating IAB node uses the third TNL address to pass the A second RRC reconfiguration complete message sent by the second F1-C connection; or, receiving a second RRC reconfiguration complete message sent by the migrating IAB node through the second F1-C connection using the fourth TNL address.
  • a fourth TNL address for the second F1-C connection is added to the migrating IAB node, and a second TNL address for the first F1-C connection is added to the migrating IAB node.
  • the processing unit 2101 sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node
  • An RRC reconfiguration message the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address for the second F1-C connection, or the first RRC reconfiguration message It includes secondary cell group (SCG) configuration information, a fourth TNL address for the second F1-C connection, and a second TNL address for the first F1-C connection.
  • SCG secondary cell group
  • SCG secondary cell group
  • the first RRC reconfiguration message further includes at least one of the following:
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the processing unit 2101 before the second Donor device sends the first RRC reconfiguration message for the migrated IAB node to the first Donor device, uses the third TNL address or the fourth TNL address to send a first message to the DU of the migrating IAB node through the second F1-C connection, so that the migrating IAB node serves the The UE establishes the second context.
  • the first message further includes serving cell configuration information of the UE.
  • the group migration apparatus 2100 in this embodiment of the present application may further include other components or modules, and for the specific content of these components or modules, reference may be made to the related art.
  • FIG. 21 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc. The implementation of this application does not limit this.
  • An embodiment of the present application provides a group migration apparatus.
  • FIG. 22 is a schematic diagram of a group migration apparatus according to an embodiment of the present application.
  • the apparatus may be, for example, an IAB node in an IAB system, or one or some components or components configured in the IAB node.
  • the IAB system includes a Donor device and an IAB node.
  • the IAB node moves from a first Donor device to a second Donor device.
  • the IAB node is called a migration IAB node, and the embodiment of this application is described from one side of the migration IAB node.
  • the implementation principle of the group migration apparatus in the embodiment of the present application is similar to the implementation of the migration of the IAB node in the embodiment of the first aspect, and the same content will not be repeated.
  • the group migration apparatus 2200 includes:
  • a receiving unit 2201 which receives, from the first Donor device, a first RRC reconfiguration message sent by the second Donor device, where the first RRC reconfiguration message includes at least one of the following:
  • a second TNL address for the first F1-C to update the first TNL address of the first F1-C connection to the second TNL address, or to add the first F1-C connection to the Second TNL address;
  • Fourth TNL address for the second F1-C to update the third TNL address of the second F1-C connection to the fourth TNL address, or use the fourth TNL address with the second
  • the CU of the Donor device establishes the second F1-C connection, or adds the fourth TNL address for the second F1-C connection;
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1-C connection is the DU of the migrated IAB node and the CU of the first Donor device.
  • F1 connection between the CUs of the second Donor device, the first TNL address and the third TNL address are TNL addresses routable to the DUs of the first Donor device, the second TNL address and
  • the fourth TNL address is the TNL address of the DU routable to the second Donor device.
  • Scenario 1 when the relocated IAB node has a radio link failure on the backhaul RLC link under the first Donor device, it is re-established to the second Donor device;
  • the receiving unit 2201 receives the first RRC reconfiguration message
  • the first RRC reconfiguration message contains a second TNL address for the first F1-C connection
  • the migrating IAB node updates the first TNL address of the first F1-C connection to the second TNL address
  • the first RRC reconfiguration message includes a second TNL address for the first F1-C connection and a fourth TNL address for the second F1-C connection
  • the migrating IAB node The first TNL address of an F1-C connection is updated to the second TNL address and the second F1-C connection is established with the CU of the second Donor device using the fourth TNL address.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the receiving unit 2201 receives the first RRC reconfiguration message, A third RRC reconfiguration message sent by the second Donor device is also received, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the apparatus 2200 further includes:
  • a first establishing unit 2202 which establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the first establishing unit 2202 establishes a second F1-C connection with the second Donor device; the receiving unit 2201 receives the CU of the second Donor device using the fourth TNL address through the second The first message sent by the F1-C connection.
  • the apparatus 2200 further includes:
  • a second establishing unit 2203 which establishes a second context for the UE serving the UE according to the first message.
  • the first message includes a first context identifier of the UE, and the migrating IAB node obtains the first context of the UE according to the first context identifier and reuses the first context to establish the the second context.
  • the first message further includes serving cell configuration information of the UE.
  • the apparatus 2200 further includes: a sending unit 2204 .
  • the receiving unit 2201 receives the second RRC replay for the UE served by the migrating IAB node and forwarded by the first Donor device through the first F1-C connection using the second TNL address configuration message, the sending unit 2204 sends the second RRC reconfiguration message to the UE it serves.
  • the receiving unit 2201 also receives the second RRC reconfiguration complete message sent by the UE served by the receiving unit 2201, and the sending unit 2204 uses the fourth TNL address to send the second F1-C connection to the The second RRC reconfiguration complete message is sent to the second Donor device.
  • the receiving unit 2201 receives a second message sent by the first Donor device through the first F1-C connection using the second TNL address, the second message including a message for F1-C
  • the sixth TNL address of U or contains the sixth TNL address for F1-U and the BAP routing identifier and backhaul RLC channel identifier for F1-U.
  • the apparatus 2200 further includes:
  • the first RRC reconfiguration message includes a handover command and a second TNL address for the first F1-C connection
  • the processing unit 2205 converts the first F1-C connection to the first The TNL address is updated to the second TNL address.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the receiving unit 2201 receives a third RRC reconfiguration message sent by the second Donor device, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection; the first establishment Unit 2202 establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the receiving unit 2201 receives the migration IAB service forwarded by the first Donor device using the second TNL address or using the first TNL address through the first F1-C connection the second RRC reconfiguration message of the UE, the sending unit 2204 sends the second RRC reconfiguration message to the UE served by the second RRC reconfiguration message.
  • the receiving unit 2201 receives the second RRC reconfiguration complete message sent by the UE served by the IAB node, and the sending unit 2204 uses the fourth TNL address to connect through the second F1-C Send the second RRC reconfiguration complete message to the second Donor device.
  • the processing unit 2205 updates the fifth TNL address of the F1-U to the sixth TNL address.
  • the receiving unit 2201 receives the first RRC reconfiguration message, the first RRC reconfiguration message
  • the reconfiguration message contains a handover command and a fourth TNL address for the second F1-C connection; the processing unit 2205 updates the third TNL address of the second F1-C connection to the fourth TNL address.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the receiving unit 2201 receives a third RRC reconfiguration message sent by the first Donor device, wherein the third RRC reconfiguration message is sent by the first Donor device.
  • the RRC reconfiguration message contains a third TNL address for the second F1-C; the first establishment unit 2202 uses the third TNL address to establish the second F1-C with the CU of the second Donor device C connection.
  • the receiving unit 2201 receives the second RRC replay for the UE served by the migrating IAB node and forwarded by the first Donor device through the first F1-C connection using the first TNL address configuration message, the sending unit 2204 sends the second RRC reconfiguration message to the UE it serves.
  • the receiving unit 2201 receives the second RRC reconfiguration complete message sent by the UE served by the IAB node, and the sending unit 2204 uses the third TNL address or the fourth TNL address to pass the The second F1-C connection sends the second RRC reconfiguration complete message to the second Donor device.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the receiving unit 2201 receives the first RRC reconfiguration information.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address for the second F1-C connection, the first establishing unit 2202
  • SCG secondary cell group
  • the second F1-C connection is established with the CU of the second Donor device using the fourth TNL address or the third TNL address.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a second TNL address for the first F1-C connection, and the processing unit 2205 is the first F1-C increments the second TNL address.
  • SCG secondary cell group
  • the first RRC reconfiguration message further includes at least one of the following:
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the receiving unit 2201 receives a third RRC reconfiguration message sent by the second Donor device, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C;
  • a establishing unit 2202 establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the receiving unit 2201 receives the service for the migrated IAB node forwarded by the first Donor device through the first F1-C connection using the first TNL address or the second TNL address the second RRC reconfiguration message of the UE, and send the second RRC reconfiguration message to the UE it serves.
  • the receiving unit 2201 receives the second RRC reconfiguration complete message sent by the UE served by the IAB node, and the sending unit 2204 uses the third TNL address or the fourth TNL address to pass the The second F1-C connection sends the second RRC reconfiguration complete message to the second Donor device.
  • the receiving unit 2201 receives the first RRC reconfiguration information.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information, a fourth TNL address for the second F1-C connection, and a fourth TNL address for the first F1-C connection
  • SCG secondary cell group
  • the processing unit 2205 adds the fourth TNL address for the second F1-C connection and the second TNL address for the first F1-C.
  • the first RRC reconfiguration message further includes at least one of the following:
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the receiving unit 2201 before the receiving unit 2201 receives the first RRC reconfiguration message, the receiving unit 2201 receives a third RRC reconfiguration message sent by the first Donor device, wherein the third RRC reconfiguration message is The RRC reconfiguration message includes a third TNL address for the second F1-C connection; the first establishing unit 2201 uses the third TNL address to establish the second TNL address with the CU of the second Donor device F1-C connection.
  • the receiving unit 2201 receives the second RRC replay for the UE served by the migrating IAB node and forwarded by the first Donor device through the first F1-C connection using the first TNL address configuration message, the sending unit 2204 sends the second RRC reconfiguration message to the UE it serves.
  • the receiving unit 2201 receives the second RRC reconfiguration complete message sent by the UE served by the IAB node, and the sending unit 2204 uses the third TNL address or the fourth TNL address to pass the The second F1-C connection sends the second RRC reconfiguration complete message to the second Donor device.
  • the resource allocation apparatus 2200 in this embodiment of the present application may further include other components or modules, and for the specific content of these components or modules, reference may be made to the related art.
  • FIG. 22 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc. The implementation of this application does not limit this.
  • An embodiment of the present application provides a group migration apparatus.
  • the apparatus may be a Donor device in the IAB system, or may be one or some components or components configured in the Donor device.
  • the IAB system includes a Donor device and an IAB node.
  • the IAB node moves from the first Donor device to the second Donor device.
  • the embodiment of this application is described from the side of the first Donor device.
  • the implementation principle of the group migration apparatus in the embodiment of the present application is similar to the implementation of the first Donor device in the embodiment of the first aspect, and the same content will not be repeated.
  • FIG. 23 is a schematic diagram of a group migration apparatus according to an embodiment of the present application.
  • a group migration apparatus 2300 according to an embodiment of the present application includes:
  • a receiving unit 2301 which receives the second TNL address of the first F1-C connection of the migrated IAB node sent by the second Donor device;
  • a processing unit 2302 which updates the first TNL address of the first F1-C connection of the migrated IAB node to the second TNL address, or adds the first TNL address to the first F1-C connection of the migrated IAB node. 2. TNL address;
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the first Donor device CU
  • the first TNL address is the DU that can be routed to the first Donor device
  • the TNL address of the second TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the migration of the IAB node from the first Donor device to the second Donor device refers to one of the following situations:
  • Scenario 1 The relocated IAB node re-establishes to the second Donor device when a radio link failure occurs in the backhaul RLC link under the first Donor device;
  • the receiving unit 2301 receives the sixth TNL address of the F1-U connection of the migrated IAB node sent by the second Donor device;
  • the processing unit 2302 updates the fifth TNL address of the F1-U connection of the migrated IAB node to the sixth TNL address, or adds the sixth TNL address to the F1-U connection of the migrated IAB node;
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the apparatus 2300 further includes:
  • Sending unit 2303 which uses the first TNL address to send a second message to the migrating IAB node through the first F1-C connection, the second message including the F1-U connection for the migrating IAB node
  • the sixth TNL address and/or the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are used to send a second message to the migrating IAB node through the first F1-C connection, the second message including the F1-U connection for the migrating IAB node.
  • the receiving unit 2301 receives a second RRC reconfiguration message sent by the second Donor device for the UE served by the migrating IAB node; the sending unit 2303 uses the second TNL address to The second RRC reconfiguration message is sent to the migrating IAB node through the first F1-C connection, so that the migrating IAB node forwards the second RRC reconfiguration message to the UE it serves.
  • the processing unit 2302 converts the first F1-C of the migrating IAB node to Before the first TNL address of the connection is updated to the second TNL address, the receiving unit 2301 receives a second RRC reconfiguration message sent by the second Donor device for the UE served by the migrating IAB node; the sending Unit 2303 uses the first TNL address to send the second RRC reconfiguration message to the migrating IAB node through the first F1-C connection, so that the migrating IAB node sends the second RRC reconfiguration message forwarded to the UE it serves.
  • FIG. 24 is another schematic diagram of the group migration apparatus according to the embodiment of the present application. As shown in FIG. 24 , the group migration apparatus 2400 according to the embodiment of the present application includes:
  • a sending unit 2401 which sends, to the second Donor device, a third TNL address used by the migrated IAB node to establish a second F1-C connection; wherein the second F1-C connection is the DU of the IAB node With the F1 connection between the CU of the second Donor device, the third TNL address is the TNL address of the DU that can be routed to the first Donor device.
  • the migrating IAB node from the first Donor device to the second Donor device refers to one of the following:
  • the apparatus 2400 further includes:
  • a receiving unit 2402 which receives the second TNL address sent by the second Donor and used for the first F1-C connection of the migrated IAB node;
  • processing unit 2403 which adds the second TNL address for the first F1-C connection of the migrated IAB node
  • the second TNL address is the TNL address of the DU that can be routed to the second Donor device
  • the first F1-C connection is between the DU of the IAB node and the CU of the first Donor device the F1 connection.
  • the receiving unit 2402 receives the sixth TNL address of the F1-U connection of the migrated IAB node sent by the second Donor device; the processing unit 2403 sends the F1-U connection of the migrated IAB node;
  • the fifth TNL address of the U connection is updated to the sixth TNL address or the sixth TNL address is added for the F1-U connection of the migrated IAB node; wherein the fifth TNL address is routable to the first TNL address.
  • the TNL address of the DU of the second Donor device, and the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the sending unit 2401 sends a third RRC reconfiguration message to the migrating IAB node, wherein the third RRC reconfiguration message includes the third TNL address, so that the migrating IAB node A second F1-C connection is established with the CU of the second Donor device.
  • the receiving unit 2402 receives a second RRC reconfiguration message sent by the second Donor device for the UE served by the migrating IAB node; the sending unit 2401 uses the first TNL address or the second RRC reconfiguration message.
  • the TNL address sends the second RRC reconfiguration message to the relocated IAB node through the first F1-C connection, so that the relocated IAB node forwards the second RRC reconfiguration message to the UE it serves; wherein,
  • the first TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the second TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device (case 3), the sending unit 2401 uses the first TNL address or uses the The second TNL address sends a second message to the migrating IAB node through the first F1-C connection, and the second message contains at least one of the following: a sixth TNL address for F1-U; for F1 -U's BAP route ID and backhaul RLC channel ID.
  • the resource allocation apparatus 2300/2400 in this embodiment of the present application may further include other components or modules, and for the specific content of these components or modules, reference may be made to the related art.
  • FIG. 23 and FIG. 24 only exemplarily show the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used .
  • the above-mentioned components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc. The implementation of this application does not limit this.
  • FIG. 25 is a schematic diagram of the communication system 2500.
  • the communication system 2500 includes Donor devices 2501 and 2502, IAB nodes 2503 and 2504, and a terminal device 2505, wherein , the IAB node 2503 is the migrating IAB node, the Donor device 2501 is the source Donor device (the first Donor device) of the IAB node 2503, the Donor device 2502 is the target Donor device (the second Donor device) of the IAB node 2503, the IAB node 2504 and the terminal Device 2505 is served by IAB node 2503.
  • the Donor device 2501 is configured to perform the method performed by the first Donor device in the embodiments of the first aspect, and may include the apparatus of FIG. 23 or FIG. 24 .
  • the Donor device 2502 is configured to perform the method performed by the second Donor device in the embodiments of the first aspect, and may include the apparatus of FIG. 21 .
  • the IAB node 2503 is configured to perform the method performed by migrating the IAB node in the implementation of the first aspect, and may include the apparatus of FIG. 22 .
  • the related content of the Donor devices 2501 and 2502 and the IAB node 2503 please refer to the embodiments of the first aspect to the fourth aspect, and the description is omitted here.
  • the embodiment of the present application also provides an IAB node.
  • FIG. 26 is a schematic diagram of an IAB node according to an embodiment of the present application.
  • the IAB node 2600 may include a processor 2601 and a memory 2602 ; the memory 2602 stores data and programs, and is coupled to the processor 2601 .
  • this figure is exemplary; other types of structures may be used in addition to or in place of this structure to implement telecommunication functions or other functions.
  • the processor 2601 may be configured to execute a program to implement the method performed by migrating an IAB node in the embodiment of the first aspect.
  • the embodiment of the present application also provides a Donor device.
  • FIG. 27 is a schematic diagram of a Donor device according to an embodiment of the present application.
  • the Donor device 2700 may include: a processor (eg, a central processing unit CPU) 2701 and a memory 2702 ; the memory 2702 is coupled to the processor 2701 .
  • the memory 2702 can store various data; in addition, it also stores information processing programs, and the programs are executed under the control of the central processing unit 2701 .
  • the processor 2701 may be configured to execute a program to implement the method performed by the first Donor device or the second Donor device in the embodiment of the first aspect.
  • the Donor device 2700 may further include: a transceiver 2703, an antenna 2704, and the like; wherein, the functions of the above components are similar to those in the prior art, and are not repeated here. It is worth noting that the Donor device 2700 does not necessarily include all the components shown in FIG. 27 ; in addition, the Donor device 2700 may also include components not shown in FIG. 27 , and reference may be made to the prior art.
  • the embodiments of the present application also provide a computer-readable program, wherein when the program is executed in an IAB node, the program causes the computer to migrate the program executed by the IAB node in the embodiment of the first aspect in the IAB node. method.
  • Embodiments of the present application further provide a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the method executed by the IAB node in the embodiment of the first aspect in the IAB node.
  • An embodiment of the present application further provides a computer-readable program, wherein when the program is executed in a Donor device, the program causes a computer to execute the first Donor device or the first Donor device in the embodiment of the first aspect in the Donor device. Two methods performed by the Donor device.
  • An embodiment of the present application further provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the first Donor device or the second Donor device in the embodiment of the first aspect in a Donor device.
  • the apparatuses and methods above in the present application may be implemented by hardware, or may be implemented by hardware combined with software.
  • the present application relates to a computer-readable program that, when executed by logic components, enables the logic components to implement the above-described apparatus or constituent components, or causes the logic components to implement the above-described various methods or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.
  • the method/apparatus described in conjunction with the embodiments of this application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams shown in the figures and/or one or more combinations of the functional block diagrams may correspond to either software modules or hardware modules of the computer program flow.
  • These software modules may respectively correspond to the various steps shown in the figure.
  • These hardware modules can be implemented by, for example, solidifying these software modules using a Field Programmable Gate Array (FPGA).
  • FPGA Field Programmable Gate Array
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
  • a storage medium can be coupled to the processor, such that the processor can read information from, and write information to, the storage medium; or the storage medium can be an integral part of the processor.
  • the processor and storage medium may reside in an ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • the functional blocks and/or one or more combinations of the functional blocks described in the drawings it can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in this application. ), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof.
  • DSP digital signal processor
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • One or more of the functional blocks and/or one or more combinations of the functional blocks described with respect to the figures can also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors processor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • a group migration method wherein the method comprises:
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1-C connection is the DU of the migrated IAB node and the CU of the first Donor device.
  • F1 connection between the CUs of the second Donor device, the first TNL address and the third TNL address are TNL addresses routable to the DUs of the first Donor device, the second TNL address and
  • the fourth TNL address is the TNL address of the DU routable to the second Donor device.
  • the relocated IAB node is re-established to the second Donor device when a radio link failure occurs on the backhaul RLC link under the first Donor device;
  • the migrating IAB node is switched from the first Donor device to the second Donor device;
  • the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device.
  • a fourth TNL address for establishing a second F1-C connection is configured for the migrating IAB node.
  • the second Donor device After the migrated IAB node is re-established to the second Donor device, the second Donor device sends a first RRC reconfiguration message to the migrated IAB node, where the first RRC reconfiguration message includes information for the second Donor device.
  • a second TNL address for an F1-C connection, or the first RRC reconfiguration message includes a second TNL address for the first F1-C connection and a second TNL address for the second F1-C connection Four TNL addresses.
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the second Donor device sends a third RRC reconfiguration message to the IAB node, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the CU of the second Donor device uses the fourth TNL address to send a first message to the DU of the migrated IAB node through the second F1-C connection, so that the migrated IAB node establishes a first message for the UE served by the migrated IAB node.
  • the second Donor device sends a second RRC reconfiguration message for the UE served by the migrating IAB node to the first Donor device, so that the first Donor device uses the second TNL address through the first Donor device
  • the F1-C connection forwards the second RRC reconfiguration message to the migrating IAB node
  • the second Donor device receives a second RRC reconfiguration complete message sent by the migrating IAB node through the second F1-C connection using the fourth TNL address.
  • a fourth TNL address for establishing the second F1-C connection is configured for the migrating IAB node, and the migrating IAB node is caused to update the first TNL address of the first F1-C connection to the second TNL address.
  • the migrating IAB node is caused to update the third TNL address for the second F1-C connection to the fourth TNL address.
  • the second Donor device sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node ;
  • the first RRC reconfiguration message includes a handover command and a fourth TNL address for the second F1-C connection, or the first RRC reconfiguration message includes a handover command and a fourth TNL address for the first F1-C connection
  • the second TNL address of the connection is
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the second Donor device sends a third RRC reconfiguration message to the migrating IAB node, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection.
  • the second Donor device receives a second RRC reconfiguration complete message sent by the migrating IAB node through the second F1-C connection using the fourth TNL address.
  • the second Donor device sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node , the first RRC reconfiguration message includes a handover command and the fourth TNL address for the second F1-C connection.
  • the CU of the second Donor device uses the third TNL address to send a first message to the relocated IAB node DU through the second F1-C connection, so that the relocated IAB node establishes a second message for the UE served by the relocated IAB node. context.
  • the second Donor device sends a second RRC reconfiguration message for the UE to the first Donor device, so that the first Donor device uses the first TNL address to reconfigure the UE through the first F1-C connection. forwarding the second RRC reconfiguration message to the migrating IAB node;
  • the second Donor device receives the second RRC reconfiguration complete message sent by the relocated IAB node using the third TNL address through the second F1-C connection; or receives the relocated IAB node using the third TNL address.
  • a second TNL address for the first F1-C connection is added for the migrating IAB node.
  • a fourth TNL address for the second F1-C connection is added to the migrating IAB node, and a second TNL address for the first F1-C connection is added to the migrating IAB node.
  • the second Donor device sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node ;
  • the first RRC reconfiguration message contains secondary cell group (SCG) configuration information and a second TNL address for the first F1-C connection.
  • SCG secondary cell group
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the second Donor device sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node ;
  • the first RRC reconfiguration message contains secondary cell group (SCG) configuration information and the fourth TNL address or the third TNL address for the second F1-C connection, or the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address for the second F1-C connection Cell Group (SCG) configuration information and a second TNL address for the first F1-C connection.
  • the CU of the second Donor device sends a first message to the migrating IAB node through the second F1-C connection using the third TNL address or the fourth TNL address, so that the migrating IAB node is its
  • the serving UE establishes a second context.
  • the second Donor device sends a second RRC reconfiguration message for the UE to the first Donor device, so that the first Donor device uses the first TNL address or the second TNL address to pass the the first F1-C connection forwards the second RRC reconfiguration message to the migrating IAB node;
  • the second Donor device receives the second RRC reconfiguration complete message sent by the relocated IAB node using the third TNL address through the second F1-C connection; or receives the relocated IAB node using the third TNL address.
  • the second Donor device sends a first RRC reconfiguration message for the migrated IAB node to the first Donor device, so that the first Donor device forwards the first RRC reconfiguration message to the migrated IAB node , the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address for the second F1-C connection, or the first RRC reconfiguration message includes a secondary cell group (SCG) SCG) configuration information, a fourth TNL address for the second F1-C connection and a second TNL address for the first F1-C connection.
  • SCG secondary cell group
  • SCG secondary cell group
  • the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node are identical to the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node.
  • the CU of the second Donor device uses the third TNL address or the fourth TNL address to send a first message to the DU of the migrating IAB node through the second F1-C connection, so that the migrating IAB node A second context is established for the UE it serves.
  • the second Donor device sends a second RRC reconfiguration message for the UE to the first Donor device, so that the first Donor device uses the first TNL address to reconfigure the UE through the first F1-C connection. forwarding the second RRC reconfiguration message to the migrating IAB node;
  • the second Donor device receives a second RRC reconfiguration complete message sent by the migrating IAB node using the third TNL address through the second F1-C connection; or receives the migrating IAB node using the fourth TNL address the second RRC reconfiguration complete message sent through the second F1-C connection.
  • a group migration method the method being applied to migrating an IAB node, the migrating IAB node being moved from a first Donor device to a second Donor device, wherein the method comprises:
  • the migrating IAB node receives, from the first Donor device, a first RRC reconfiguration message sent by the second Donor device, where the first RRC reconfiguration message includes at least one of the following:
  • a second TNL address for the first F1-C to update the first TNL address of the first F1-C connection to the second TNL address, or to add the first F1-C connection to the Second TNL address;
  • Fourth TNL address for the second F1-C to update the third TNL address of the second F1-C connection to the fourth TNL address, or use the fourth TNL address with the second
  • the CU of the Donor device establishes the second F1-C connection, or adds the fourth TNL address for the second F1-C connection;
  • the third TNL address for the second F1-C connection to add the third TNL address for the second F1-C connection, or to use the third TNL address to establish a relationship with the CU of the second Donor device. the second F1-C connection;
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the CU of the first Donor device
  • the second F1-C connection is the DU of the migrated IAB node and the CU of the first Donor device.
  • F1 connection between the CUs of the second Donor device, the first TNL address and the third TNL address are TNL addresses routable to the DUs of the first Donor device, the second TNL address and
  • the fourth TNL address is the TNL address of the DU routable to the second Donor device.
  • the relocated IAB node is re-established to the second Donor device when a radio link failure occurs on the backhaul RLC link under the first Donor device;
  • the migrating IAB node is switched from the first Donor device to the second Donor device;
  • the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device.
  • the first RRC reconfiguration message contains a second TNL address for the first F1-C connection
  • the migrating IAB node updates the first TNL address of the first F1-C connection to the second TNL address
  • the first RRC reconfiguration message includes a second TNL address for the first F1-C connection and a fourth TNL address for the second F1-C connection
  • the migrating IAB node The first TNL address of an F1-C connection is updated to the second TNL address and the second F1-C connection is established with the CU of the second Donor device using the fourth TNL address.
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the migrating IAB node receiving, by the migrating IAB node, a third RRC reconfiguration message sent by the second Donor device, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C connection;
  • the migrating IAB node establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the migrating IAB node establishes a second F1-C connection with the second Donor device, and receives the first F1-C connection sent by the CU of the second Donor device using the fourth TNL address through the second F1-C connection information;
  • the migrating IAB node establishes a second context for the UE it serves based on the first message.
  • the migrating IAB node acquires the first context of the UE according to the first context identifier and reuses it The first context establishes the second context.
  • the migrating IAB node receives the second RRC reconfiguration message for the UE served by the migrating IAB node that is forwarded by the first Donor device using the second TNL address through the first F1-C connection, and reconfigures the sending the second RRC reconfiguration message to the UE it serves;
  • the migrating IAB node receives the second RRC reconfiguration complete message sent by the UE it serves, and uses the fourth TNL address to send the second RRC reconfiguration complete message to the second RRC reconfiguration complete message through the second F1-C connection.
  • the second Donor device is described.
  • the migrating IAB node receives a second message sent by the first Donor device over the first F1-C connection using the second TNL address, the second message containing a sixth TNL address for the F1-U , or contains the sixth TNL address for F1-U and the BAP routing identifier and backhaul RLC channel identifier for F1-U;
  • the migrating IAB node updates the fifth TNL address of the F1-U to the sixth TNL address.
  • the first RRC reconfiguration message contains a handover command and a fourth TNL address for the second F1-C connection, and the migrating IAB node uses the fourth TNL address to establish the CU of the second Donor device.
  • the first RRC reconfiguration message contains a handover command and a second TNL address for the first F1-C connection, and the migrating IAB node updates the first TNL address of the first F1-C connection to the the second TNL address.
  • the migrating IAB node establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the migrating IAB node receives the second RRC reconfiguration complete message sent by the UE it serves, and uses the fourth TNL address to send the second RRC reconfiguration complete message to the second RRC reconfiguration complete message through the second F1-C connection.
  • the migrating IAB node updates the fifth TNL address of the F1-U to the sixth TNL address.
  • the migrating IAB node receives the first RRC reset. a configuration message, where the first RRC reconfiguration message includes a handover command and a fourth TNL address for the second F1-C connection;
  • the migrating IAB node updates the third TNL address of the second F1-C connection to the fourth TNL address.
  • the migrating IAB node receiving, by the migrating IAB node, a third RRC reconfiguration message sent by the first Donor device, where the third RRC reconfiguration message includes a third TNL address for the second F1-C;
  • the migrating IAB node establishes the second F1-C connection with the CU of the second Donor device using the third TNL address.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address for the second F1-C connection, and the migrating IAB node uses the fourth TNL address or the third TNL address to establish the second F1-C connection with the CU of the second Donor device;
  • SCG secondary cell group
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a second TNL address for the first F1-C connection, and the migrating IAB node adds for the first F1-C the second TNL address.
  • SCG secondary cell group
  • the method further includes:
  • the migrating IAB node receiving, by the migrating IAB node, a third RRC reconfiguration message sent by the second Donor device, wherein the third RRC reconfiguration message includes a fourth TNL address for the second F1-C;
  • the migrating IAB node establishes the second F1-C connection with the CU of the second Donor device using the fourth TNL address.
  • the migrating IAB node receives the second RRC for the UE served by the migrating IAB node and forwarded by the first Donor device using the first TNL address or the second TNL address through the first F1-C connection a reconfiguration message, and send the second RRC reconfiguration message to the UE it serves;
  • the migrating IAB node receives the second RRC reconfiguration complete message sent by the UE it serves, and uses the third TNL address or the fourth TNL address to connect the second RRC to the second RRC through the second F1-C connection.
  • a reconfiguration complete message is sent to the second Donor device.
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and a fourth TNL address for the second F1-C connection, and the relocated IAB node adds all the information for the second F1-C connection.
  • SCG secondary cell group
  • the first RRC reconfiguration message includes secondary cell group (SCG) configuration information, a fourth TNL address for the second F1-C connection, and a second TNL address for the first F1-C connection,
  • SCG secondary cell group
  • the migrating IAB node adds the fourth TNL address for the second F1-C connection and the second TNL address for the first F1-C.
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the migrating IAB node receiving, by the migrating IAB node, a third RRC reconfiguration message sent by the first Donor device, wherein the third RRC reconfiguration message includes a third TNL address for the second F1-C connection;
  • the migrating IAB node establishes the second F1-C connection with the CU of the second Donor device using the third TNL address.
  • the migrating IAB node receives the second RRC reconfiguration message for the UE served by the migrating IAB node and forwarded by the first Donor device using the first TNL address through the first F1-C connection, and reconfigures the sending the second RRC reconfiguration message to the UE it serves;
  • the migrating IAB node receives the second RRC reconfiguration complete message sent by the UE it serves, and uses the third TNL address or the fourth TNL address to connect the second RRC to the second RRC through the second F1-C connection.
  • a reconfiguration complete message is sent to the second Donor device.
  • a group migration method the method is applied to a first Donor device, and a migration IAB node is moved from the first Donor device to a second Donor device, wherein the method comprises:
  • the first Donor device updates the first TNL address of the first F1-C connection of the migrating IAB node to the second TNL address, or adds the first TNL address to the first F1-C connection of the migrating IAB node Second TNL address;
  • the first F1-C connection is the F1 connection between the DU of the migrated IAB node and the first Donor device CU
  • the first TNL address is the DU that can be routed to the first Donor device
  • the TNL address of the second TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the relocated IAB node re-establishes to the second Donor device when a radio link failure occurs in the backhaul RLC link under the first Donor device;
  • the migrating IAB node is switched from the first Donor device to the second Donor device
  • the above-mentioned migrated IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device.
  • the first Donor device updates the fifth TNL address of the F1-U connection of the migrated IAB node to the sixth TNL address, or adds the sixth TNL address to the F1-U connection of the migrated IAB node ;
  • the fifth TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the first Donor device sends a second message to the migrating IAB node using the first TNL address over the first F1-C connection, the second message containing the F1-U for the migrating IAB node
  • the sixth TNL address of the connection and/or the BAP routing identifier and the backhaul RLC channel identifier for the F1-U connection of the migrating IAB node
  • the first Donor device uses the second TNL address to send the second RRC reconfiguration message to the migrating IAB node through the first F1-C connection, so that the migrating IAB node sends the second RRC reconfiguration message to the migrating IAB node.
  • the RRC reconfiguration message is forwarded to the UE it serves.
  • a group migration method the method is applied to a first Donor device, and a migration IAB node is moved from the first Donor device to the second Donor device, wherein the method comprises:
  • the second F1-C connection is the F1 connection between the DU of the IAB node and the CU of the second Donor device
  • the third TNL address is the DU that can be routed to the first Donor device the TNL address.
  • the migrating IAB node is switched from the first Donor device to the second Donor device;
  • the migrating IAB node maintains the connection with the first Donor device and increases the air interface connection with the second Donor device.
  • the first Donor device receives the second TNL address sent by the second Donor for the first F1-C connection of the migrated IAB node, and adds the address for the first F1-C connection of the migrated IAB node. said second TNL address,
  • the second TNL address is a TNL address that can be routed to the DU of the second Donor device, and the first F1-C connection is between the DU of the IAB node and the CU of the first Donor device the F1 connection.
  • the first Donor device updates the fifth TNL address of the F1-U connection of the migrating IAB node to the sixth TNL address or adds the sixth TNL address for the F1-U connection of the migrating IAB node;
  • the fifth TNL address is the TNL address of the DU that can be routed to the second Donor device
  • the sixth TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the first Donor device sends a third RRC reconfiguration message to the migrating IAB node, wherein the third RRC reconfiguration message includes the third TNL address, so that the migrating IAB node and the second The CU of the Donor device establishes a second F1-C connection.
  • the first Donor device uses the first TNL address or the second TNL address to send the second RRC reconfiguration message to the migrating IAB node through the first F1-C connection, so that the migrating IAB node sends the second RRC reconfiguration message to the migrating IAB node.
  • the RRC reconfiguration message is forwarded to the UE it serves;
  • the first TNL address is the TNL address of the DU that can be routed to the first Donor device
  • the second TNL address is the TNL address of the DU that can be routed to the second Donor device.
  • the first Donor device uses the first TNL address or uses the second TNL address to send a second message to the migrating IAB node through the first F1-C connection, where the second message at least includes at least one of the following items :
  • a Donor device comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor is configured to execute the computer program to implement any one of Supplements 1 to 31 and 57 to 68 the method described.
  • An IAB node comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor is configured to execute the computer program to implement the method according to any one of appendixes 32 to 56 .
  • a communication system comprising a Donor device, an IAB node and a terminal device, wherein the Donor device is configured to execute the method according to any one of Supplements 1 to 31 and 57 to 68, the IAB node is configured To execute the method described in any one of Supplementary Notes 32 to 56.

Abstract

本申请实施例提供了一种群组迁移方法、装置和系统,所述群组迁移方法包括:在迁移IAB节点从第一Donor和移动到第二Donor设备时,所述第二Donor设备进行以下处理的至少一种:使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;以及为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址。

Description

群组迁移方法、装置和系统 技术领域
本申请涉及通信领域。
背景技术
未来无缝的蜂窝网络部署需要非常灵活和超密集的NR小区部署,超密集网络是5G的目标之一,部署一个无需有线回传的NR网络对于实现5G的超密集网络非常重要。由于5G毫米波使小区覆盖范围缩小,无线自回传系统还需要是多跳的才能满足部署需求。5G的高带宽、大规模MIMO和波束系统使5G比LTE更容易开发超密集NR小区的无线自回传系统,为了开发这种带有无线自回传的多跳系统,3GPP在R16开始了IAB(Integrated access and backhaul,接入回传一体化)项目的研究和标准化。
图1是IAB系统的一个示意图,如图1所示,在IAB系统中,中继节点同时支持接入(access)和回传(backhaul)功能,中继节点的无线传输链路在时域、频域或空域上复用接入链路(access link)和回传链路(backhaul link),接入链路和回传链路可以使用相同或不同的频段。
在IAB网络架构如下,中继节点指的是IAB-node(IAB节点),其同时支持接入和回传功能。网络侧最后一跳接入节点称为IAB-donnor(IAB宿主),其支持gNB功能并支持IAB-node接入。所有的UE数据可以通过一跳或多跳经IAB-node回传到IAB-donor。
IAB-node的功能分为两部分,一部分是gNB-DU功能,称作IAB-DU,另一部分是UE功能,称作IAB-MT。IAB-DU实现网络侧设备功能,连接到下游的child IAB-node(子IAB节点),对UE以及下游child IAB-node提供NR空口接入并与IAB donor-CU之间建立有F1连接。IAB-MT实现部分终端设备功能,连接到上游的parent IAB-node(父IAB节点)或IAB-donor DU,IAB-MT包括物理层、层二、RRC(Radio Resource Control,无线资源控制)和NAS(Non-Access Stratum,非接入层)层功能,还间接的连接到IAB donor-CU以及核心网(Core Network,CN)。
在IAB系统中,IAB-node可以通过独立组网(SA,Standalone)模式或非独立组网(EN-DC,E-UTRA-NRDualConnectivity)模式接入网络。图2是SA模式的IAB 架构的示意图。图3是EN-DC模式的IAB架构的示意图。
图4是一个IAB节点(IAB-node)与父节点(parent IAB-node)和子节点(child IAB-node)的示意图。如图4所示,IAB节点的IAB-DU作为网络侧与子节点的IAB-MT连接,IAB节点的IAB-MT作为终端侧与父节点的IAB-DU连接。。
图5是IAB-DU和IAB-donor CU之间的F1用户面(F1-U)协议栈的示意图。图6是IAB-DU和IAB-donor CU之间的F1控制面(F1-C)协议栈的示意图。
如图5和图6所示,F1-U和F1-C是建立在IAB-DU和IAB-donor-CU之间的传输(IP)层之上,图5和图6中经过两跳无线回传和一跳有线回传。在回传链路上,传输(IP)层承载在回传自适应协议(BAP)子层上,IAB-node中的BAP实体实现IAB系统的路由功能,由IAB-donor CU提供路由表。BAP PDU(协议数据单元)在回传链路的RLC(无线链路控制)信道中传输,回传链路的多个RLC信道可以被IAB-donor配置为承载不同的优先级和QoS(服务质量)的业务,由BAP实体将BAP PDU映射到不同的回传RLC信道上。
应该注意,上面对技术背景的介绍只是为了方便对本申请的技术方案进行清楚、完整的说明,并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本申请的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
发明人发现,在R16中,IAB系统已经支持了IAB-node在同一个Donor下的不同DU之间移动时引起的拓扑和路由的自适应改变。IAB-node在同一个Donor下移动时(此时,该IAB-node称为Migrating IAB-node),还保持与下游child IAB-node和UE的拓扑关系。虽然IAB-node经过新的Donor的DU接入Donor的CU,可能被分配能够通向新Donor的DU的TNL(传输网络层)地址,也即IP地址,但是,Migrating IAB-node服务的子节点或UE无需迁移,因此migrating node无需与Donor建立新的F1-C连接,如图7所示,Migrating IAB-node从IAB-node 1移动到IAB-node 2后,只是更新或增加了F1-C的传输路径,此过程称为F1重定向。
此外,发明人发现,R17将引入IAB-node在不同Donor之间的移动功能,这种情况下由于IAB-node连接到新的Donor后,成为新Donor下的DU服务其子IAB节点或UE,因此要与新的Donor建立F1-C连接并将IAB-node下的子IAB节点或UE 迁移至新Donor,以实现donor设备之间的负载均衡。此时,Migrating IAB-node需要知道是否在进行donor间的迁移或者是否建立新的F1-C连接,但现有技术无法指示Migrating IAB-node是否正在进行donor间的迁移以及是否需要建立新的F1-C连接。另一方面,Migrating IAB-node在不同的Donor之间移动时,Migrating IAB-node可与原Donor和新Donor同时保持有F1-C连接,需要同时重定向新旧F1连接以优化F1的转发路径,但现有技术无法使IAB-node区分旧F1-C连接或新F1-C连接的重定向。
为了解决上述问题的至少一种或其它类似问题,本申请实施例提供了一种群组迁移方法、装置和系统。
根据本申请实施例的一方面,提供一种群组迁移装置,配置于第二Donor设备,所述装置包括:
处理单元,在迁移IAB节点从第一Donor和移动到第二Donor设备时,所述处理单元进行以下处理的至少一种:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;
使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
根据本申请实施例的一方面,提供一种群组迁移装置,所述装置配置于迁移IAB节点,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,其中,所述装置包括:
接收单元,其从所述第一Donor设备接收所述第二Donor设备发送的第一RRC重配置消息,所述第一RRC重配置消息包括以下至少一项:
用于第一F1-C的第二TNL地址,以将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址,或为所述第一F1-C连接增加所述第二TNL地址;
用于第二F1-C的第四TNL地址,以将所述第二F1-C连接的第三TNL地址更新至所述第四TNL地址,或使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接,或为所述第二F1-C连接增加所述第四TNL地址;
用于第二F1-C连接的第三TNL地址,以为所述第二F1-C连接增加所述第三TNL地址,或使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
根据本申请实施例的一方面,提供一种群组迁移装置,配置于第一Donor设备,迁移IAB节点从所述第一Donor设备移动到第二Donor设备,其中,所述装置包括:
接收单元,其接收所述第二Donor设备发送的所述迁移IAB节点的第一F1-C连接的第二TNL地址;
处理单元,其将所述迁移IAB节点的第一F1-C连接的第一TNL地址更新为所述第二TNL地址,或者为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备CU之间的F1连接,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
本申请实施例的有益效果之一在于:当Migrating IAB-node从原Donor移动至目标donor时,目标Donor可指示迁移IAB节点是否在进行donor间迁移或者是否建立新的F1-C连接,使得迁移IAB节点可以在donor间迁移时与目标Donor建立新F1-C连接,成为新Donor下的DU服务其子IAB节点或UE,实现将迁移IAB节点下的子IAB节点或UE迁移至目标Donor,从而完成了donor设备之间的负载均衡。另一方面,当Migrating IAB-node从原Donor移动至目标donor并与原Donor或目标Donor 同时保持有F1-C连接时,目标Donor可以同时重定向原F1连接和新F1连接,并向迁移IAB节点指示原F1-C连接或新F1-C连接的重定向,从而优化了原F1-C连接以及新F1-C连接的转发路径。
参照后文的说明和附图,详细公开了本申请的特定实施方式,指明了本申请的原理可以被采用的方式。应该理解,本申请的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内,本申请的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用,与其它实施方式中的特征相组合,或替代其它实施方式中的特征。
应该强调,术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在,但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
附图说明
在本申请实施例的一个附图或一种实施方式中描述的元素和特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外,在附图中,类似的标号表示几个附图中对应的部件,并可用于指示多于一种实施方式中使用的对应部件。
所包括的附图用来提供对本申请实施例的进一步的理解,其构成了说明书的一部分,用于例示本申请的实施方式,并与文字描述一起来阐释本申请的原理。显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其它的附图。在附图中:
图1是IAB系统的一个示意图;
图2是SA模式的IAB架构的示意图;
图3是EN-DC模式的IAB架构的示意图;
图4是父节点(parent IAB-node)和子节点(child IAB-node)的示意图;
图5是IAB系统的F1-U协议栈的示意图;
图6是IAB系统的F1-C协议栈的示意图;
图7是IAB节点在同一个Donor下的不同DU之间移动的一个示意图;
图8是本申请实施例的群组迁移方法的一个示意图;
图9是本申请实施例的群组迁移方法的一个场景的示意图;
图10是图9所示场景下的信息交互示意图;
图11a和图11b是本申请实施例的群组迁移方法的另一个场景的示意图;
图12是图11a和图11b所示的场景下的信息交互示意图;
图13a和图13b是本申请实施例的群组迁移方法的又一个场景的示意图;
图14是图13a和图13b所示的场景下的信息交互示意图;
图15是本申请实施例的群组迁移方法的再一个场景的示意图;
图16是图15所示的场景下的信息交互示意图;
图17a和图17b是本申请实施例的群组迁移方法的再一个场景的示意图;
图18是图17a和图17b所示的场景下的信息交互示意图;
图19a和图19b是本申请实施例的群组迁移方法的再一个场景的示意图;
图20是图19a和图19b所示的场景下的信息交互示意图;
图21是本申请实施例的群组迁移装置的一个示意图;
图22是本申请实施例的群组迁移装置的另一个示意图;
图23是本申请实施例的群组迁移装置的又一个示意图;
图24是本申请实施例的群组迁移装置的再一个示意图;
图25是本申请实施例的通信系统的一个示意图;
图26是本申请实施例的IAB节点的一个示意图;
图27是本申请实施例的Donor设备的一个示意图。
具体实施方式
参照附图,通过下面的说明书,本申请的前述以及其它特征将变得明显。在说明书和附图中,具体公开了本申请的特定实施方式,其表明了其中可以采用本申请的原则的部分实施方式,应了解的是,本申请不限于所描述的实施方式,相反,本申请包括落入所附权利要求的范围内的全部修改、变型以及等同物。
在本申请实施例中,术语“第一”、“第二”等用于对不同元素从称谓上进行区分,但并不表示这些元素的空间排列或时间顺序等,这些元素不应被这些术语所限制。术语“和/或”包括相关联列出的术语的一种或多个中的任何一个和所有组合。术语“包含”、“包括”、“具有”等是指所陈述的特征、元素、元件或组件的存在,但并不排除存在或添加一个或多个其他特征、元素、元件或组件。
在本申请实施例中,单数形式“一”、“该”等包括复数形式,应广义地理解为“一种”或“一类”而并不是限定为“一个”的含义;此外术语“所述”应理解为既包括单数形式也包括复数形式,除非上下文另外明确指出。此外术语“根据”应理解为“至少部分根据……”,术语“基于”应理解为“至少部分基于……”,除非上下文另外明确指出。
在本申请实施例中,术语“通信网络”或“无线通信网络”可以指符合如下任意通信标准的网络,例如新无线(NR,New Radio)、长期演进(LTE,Long Term Evolution)、增强的长期演进(LTE-A,LTE-Advanced)、宽带码分多址接入(WCDMA,Wideband Code Division Multiple Access)、高速报文接入(HSPA,High-Speed Packet Access)等等。
并且,通信系统中设备之间的通信可以根据任意阶段的通信协议进行,例如可以包括但不限于如下通信协议:1G(generation)、2G、2.5G、2.75G、3G、4G、4.5G以及未来的5G、6G等等,和/或其他目前已知或未来将被开发的通信协议。
在本申请实施例中,术语“网络设备”例如是指通信系统中将终端设备接入通信网络并为该终端设备提供服务的设备。网络设备可以包括但不限于如下设备:基站(BS,Base Station)、接入点(AP、Access Point)、发送接收点(TRP,Transmission Reception Point)、广播发射机、移动管理实体(MME、Mobile Management Entity)、网关、服务器、无线网络控制器(RNC,Radio Network Controller)、基站控制器(BSC,Base Station Controller)等等。
其中,基站可以包括但不限于:节点B(NodeB或NB)、演进节点B(eNodeB或eNB)以及5G基站(gNB),等等,此外还可包括远端无线头(RRH,Remote Radio Head)、远端无线单元(RRU,Remote Radio Unit)、中继(relay)或者低功率节点(例如femto、pico等等)。并且术语“基站”可以包括它们的一些或所有功能,每个基站可以对特定的地理区域提供通信覆盖。术语“小区”可以指的是基站和/或其覆盖区域,这取决于使用该术语的上下文。
在本申请实施例中,术语“用户设备”(UE,User Equipment)例如是指通过网络设备接入通信网络并接收网络服务的设备,也可以称为“终端设备”(TE,Terminal Equipment)。终端设备可以是固定的或移动的,并且也可以称为移动台(MS,Mobile Station)、终端、用户、用户台(SS,Subscriber Station)、接入终端(AT,Access Terminal)、 站,等等。
其中,终端设备可以包括但不限于如下设备:蜂窝电话(Cellular Phone)、个人数字助理(PDA,Personal Digital Assistant)、无线调制解调器、无线通信设备、手持设备、机器型通信设备、膝上型计算机、无绳电话、智能手机、智能手表、数字相机,等等。
再例如,在物联网(IoT,Internet of Things)等场景下,终端设备还可以是进行监控或测量的机器或装置,例如可以包括但不限于:机器类通信(MTC,Machine Type Communication)终端、车载通信终端、设备到设备(D2D,Device to Device)终端、机器到机器(M2M,Machine to Machine)终端,等等。
下面结合附图对本申请的各种实施方式进行说明。这些实施方式只是示例性的,不是对本申请的限制。
第一方面的实施例
本申请实施例提供一种群组迁移方法。
图8是本申请实施例的群组迁移方法的一个示意图,从第二Donor设备的一侧进行说明。其中迁移IAB节点从第一Donor设备移动到第二Donor设备,从迁移IAB节点移动的方向的角度,本申请实施例的第一Donor设备为原Donor设备,简称为第一Donor或原Donor,第二Donor设备为目标Donor设备,简称为第二Donor或目标Donor。如图8所示,该方法包括:
801:在迁移IAB节点从第一Donor设备移动到第二Donor设备时,所述第二Donor设备进行以下处理的至少一种:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;
使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;以及
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址。
在本申请实施例中,迁移IAB节点从第一Donor设备移动到第二Donor设备,是指,迁移IAB节点在第一Donor设备下的回传RLC链路发生无线链路失败时,重 建立到第二Donor设备;或者是,迁移IAB节点从第一Donor设备切换到第二Donor设备;或者是,迁移IAB节点保持与第一Donor设备的连接并增加与第二Donor设备的空口连接。
下面分别进行说明。
在上面和下面的说明中,第一F1-C连接(简称为第一F1-C或原F1-C)为迁移IAB节点的DU与第一Donor设备的CU之间的F1连接,第二F1-C连接(简称为第二F1-C或新F1-C)为迁移IAB节点的DU与第二Donor设备的CU之间的F1连接。此外,在上面和下面的说明中,第一TNL地址、第三TNL地址和第五TNL地址是可路由至第一Donor设备的DU的TNL地址,第二TNL地址、第四TNL地址和第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在上述实施例中,当迁移IAB节点从第一Donor移动至第二donor时,第二Donor通过向迁移IAB节点配置用于第二F1-C的TNL地址指示迁移IAB节点建立新的F1-C连接,使得迁移IAB节点成为新Donor下的DU服务其子IAB节点或UE,从而可以使IAB系统实现了将迁移IAB节点下的子IAB节点或UE迁移至目标Donor,完成donor设备之间的负载均衡。另一方面,当迁移IAB节点从第一Donor移动至第二donor并与第一Donor和第二Donor保持有F1-C连接时,第二Donor通过更新第一F1-C的TNL地址或更新第二F1-C的TNL地址,重定向了F1-C连接,优化了F1-C的转发路径,实现了更高效的信令转发;以及,第二Donor通过为第一F1-C或第二F1-C增加TNL地址,增加了F1-C的转发路径,实现了更灵活的信令转发。
在一些实施例中,迁移IAB节点在第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到第二Donor设备。第二Donor设备使迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址,并且为迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址。
例如,在迁移IAB节点重建立到第二Donor设备之后,第二Donor设备向迁移IAB节点发送第一RRC重配置消息。
该第一RRC重配置消息包含用于第一F1-C连接的第二TNL地址,由此,迁移IAB节点可以将第一F1-C连接的第一TNL地址更新至该第二TNL地址;或者,该第一RRC重配置消息包含用于第一F1-C连接的第二TNL地址以及用于所述第二F1-C连接的第四TNL地址,由此,迁移IAB节点将第一F1-C连接的第一TNL地址 更新至该第二TNL地址并且使用该第四TNL地址与第二Donor设备的CU建立第二F1-C连接。
通过上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,使得第一F1-C连接可经过第二Donor的DU进行转发,优化了第一F1-C连接的传输路径,同时,第二Donor设备通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点重建立到第二Donor设备后可立即建立第二F1-C连接,从而可实现后续对UE的迁移。
在上述实施例中,上述第一RRC重配置消息还可以包含:分配给该迁移IAB节点的BAP地址;和/或,该迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;和/或,用于该迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址,使得F1-U连接可经过第二Donor的DU进行转发;和/或,用于该迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,如果上述第一RRC重配置消息中不包含上述用于第二F1-C连接的第四TNL地址,也即不指示迁移IAB节点重建立到第二Donor设备后立即建立第二F1-C连接,在第二Donor设备向迁移IAB节点发送第一RRC重配置消息一段时间之后,该第二Donor设备还可以向迁移IAB节点发送第三RRC重配置消息;该第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。由此,迁移IAB节点在接收到该第三RRC重配置消息后,可以使用上述第四TNL地址与第二Donor设备的CU建立第二F1-C连接。
在上述实施例中,第二Donor设备与迁移IAB节点建立第二F1-C连接后,为了将迁移IAB节点服务的UE迁移至第二Donor设备,该第二Donor设备的CU可以使用上述第四TNL地址通过该第二F1-C连接向迁移IAB节点的DU发送第一消息,以便该迁移IAB节点根据该第一消息为其服务的UE建立第二上下文。
作为一个示例,上述第一消息可以包含上述UE的第一上下文标识,以便迁移IAB节点根据该第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文;该第一消息可以是F1建立响应或UE上下文修改请求消息。
作为另一个示例,上述第一消息还可以包含上述UE的服务小区配置信息,以便迁移IAB节点更新上述UE的服务小区配置。
通过上述实施例的方法,迁移节点仅需要根据第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,无需通过现有的UE上下文建立过程,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在上述实施例中,迁移UE时,第二Donor设备还可以向第一Donor设备发送针对上述迁移IAB节点服务的UE的第二RRC重配置消息,以便该第一Donor设备使用上述第二TNL地址通过上述第一F1-C连接将该第二RRC重配置消息转发至迁移IAB节点。由此,该迁移IAB节点在接收到该第二RRC重配置消息后,可以将该第二RRC重配置消息发送给其服务的UE。
此外,该迁移IAB节点还可以接收其服务的UE发送的第二RRC重配置完成消息,并使用第四TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备。
由此,第二Donor设备还可以接收该迁移IAB节点使用前述第四TNL地址通过前述第二F1-C连接发送的第二RRC重配置完成消息。
在上述实施例中,第一Donor设备还可以使用第一TNL地址通过第一F1-C连接向迁移IAB节点发送第二消息,该第二消息包含用于迁移IAB节点的F1-U连接的第六TNL地址,或者包含用于迁移IAB节点的F1-U连接的第六TNL地址以及用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。由此,迁移IAB节点可以接收该第二消息,并将其F1-U连接的第五TNL地址更新为第六TNL地址,使得F1-U连接可经过第二Donor的DU进行转发,优化了F1-U连接的传输路径。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的第一F1-C连接的第二TNL地址,并将迁移IAB节点的第一F1-C连接的第一TNL地址更新为第二TNL地址,从而在第一Donor设备侧重定向第一F1-C,优化第一F1-C的传输路径。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的F1-U连接的第六TNL地址,并将该迁移IAB节点的F1-U连接的第五TNL地址更新为该第六TNL地址,从而在第一Donor设备侧重定向F1-U,优化F1-U的传输路径。
图9是上述实施例的应用场景的示例图,图10是上述实施例的信息交互示意图。下面结合图9和图10对上述实施例进行说明。
如图9所示,Migrating node的回传(BH)链路出现无线链路失败(RLF)导致migrating node选择donor 2进行连接重建立。由于是重建立到Donor 2,migrating node只能在连接到donor 2之后与Donor 2建立F1-C。原F1-C(old F1-C),也即Donor CU 1与migrating node的F1-C,可能也从原传输路径更新至新传输路径。UE的RRC重配置完成消息需要通过新F1-C(new F1-C),也即Donor CU 2与migrating node的F1-C,发送给Donor 2,因此migrating node先于UE迁移到Donor 2。
如图10所示,该信息交互过程包括:
1001,Migrating node检测BH链路发生无线链路失败,选择IAB-node 2下的小区进行RRC连接重建立,其间Donor 2会向Donor 1获取migrating node及其服务的UE的上下文。
1002,Migrating node完成RRC重建立过程后,Donor CU 2向migrating node发送RRCReconfiguration消息。因为改变连接到donor 2下,该消息内还包含有donor 2分配给migrating node的BAP address,由于回传链路改变到IAB-node 2下,所以该消息还包含从migrating node到IAB-node 2的BH RLC信道配置,以及用于F1-C和非F1数据的BAP路由(默认路由)和新BH RLC信道(默认BH信道ID)。
此外,由于Donor CU 1与migrating node之间建立的Old F1连接的接入锚点从IAB-node 1变为IAB-node 2,原F1数据需要经过Donor 2下的Donor DU 2和IAB-node 2转发,即传输由原路径转换至新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1),此时,需要给migrating node配置适应Donor DU 2的子网地址。此时UE的信令仍然是通过Old F1-C发送至Donor CU 1,但是Old F1-C需要转移至新路径,所以RRC重配置消息还包含Old F1-C的TNL address,以更新old F1-C的传输路径。
此外,此时UE的DRB数据仍然是通过F1-U(即migrating node与Donor CU1之间建立的F1-U)发送到Donor CU 1,F1-U由原路径转到新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1)。为了最小化F1-U传输的中断时间,该RRC重配置消息内还可以包含F1-U的TNL address,指示更新F1-U的传输路径,使得migrating node可将F1-U立即转换到新路径传输;除此之外,该RRC重配置消息还可以包含用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说该RRC重配置消息中包含每个UE的RLC信道使用的BAP路由,以及UE ID、UE的 RLC信道到migrating node的回传RLC信道的对应关系。
其中,对于New F1-C的建立有两种情况:
情况一:New F1-C在migrating node重建立到Donor 2之后立刻建立。则上述RRC重配置消息还包含用于New F1-C的TNL address,以指示建立new F1-C。
情况二:migrating node重建立到Donor 2之后不立刻迁移UE,因此New F1-C可以在migrating node重建立到Donor 2一段时间之后才建立。则在后续RRC重配置消息中包含New F1-C的TNL address,见图10的操作1005之后的RRC重配置过程。
1003,Donor CU 2收到migrating node的RRC重配置完成后,发起针对migrating node的核心网路径切换。
1004,因为migrating node的New F1-C、Old F1-C以及F1-U的数据都需要经过新路径传输,Donor CU 2收到migrating node的RRC重配置完成后,对新路径上的节点配置BH RLC信道、BAP层路由以及BH RLC信道映射关系。
上述1004的操作可以在前述1001的操作之后立刻执行,但本申请对此不做限制。
1005,migrating node使用更新的TNL address将Old F1-C转换到新路径。
其中,migrating node还可以使用更新的TNL address将F1-U转换到新路径。
1006,Migrating node使用指示建立new F1-C的TNL address与donor CU 2建立new F1-C。
1007,如果操作1002中RRC重配置消息不包含F1-U的配置信息,Donor CU 1通过Old F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification),以更新F1-U的TNL address,使得F1-U转换到新路径,还可修改F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,通过该F1AP消息配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
其中,操作1007可以在操作1005后立即执行,但本申请对此不做限制。
1008:为了将UE迁移至donor 2,在migrating node New F1-C中建立UE的上下文。这样UE在Old F1-C和New F1-C中分别有一套上下文,即对于UE,migrating node与donor CU 1和donor CU 2之间分别有一条F1AP信令连接。与donor CU 1的F1AP信令连接用于向UE发送RRC重配置消息,与donor CU2的F1AP信令连接用于接收UE的RRC重配置完成消息。
其中,在migrating node的New F1-C中建立UE的上下文的方法有三种:
方法一:Donor CU 2通过New F1-C向migrating node发送F1AP消息,即UE上下文建立请求(UE context setup request)。
在方法一中,Migrating node可以为UE分配C-RNTI,将C-RNTI通过UE context setup response发送给Donor CU2。
在方法一中,UE contxt setup request包含对UE DRB的F1-U配置,F1-U可以配置在donor CU1侧,UE的DRB使用Donor CU 1的UL TNL address;也可以配置在donor DU 2侧,UE的DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的F1-U从Donor CU 1转换至Donor CU 2。
方法二:Donor CU2通过New F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification)。
在方法二中,UE context modification中携带UE在Old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取Old F1-C下的UE上下文并利用其在New F1-C中创建新UE上下文。由于migrating node切换到donor 2下要改变服务小区标识,UE context modification中可以包含UE的服务小区标识,migrating node用该小区标识替换原UE上下文中的服务小区标识。此外,UE改变服务小区时也可能改变C-RNTI,因此Migrating node为UE分配新C-RNTI,并用新C-RNTI替换原C-RNTI。其中,Migrating node可以将新C-RNTI通过UE context setup response发送给Donor CU2。
在方法二中,UE contxt modification中可以对F1-U配置进行修改,修改的F1-U可以仍然在donor CU1侧,UE的DRB使用Donor CU 1的UL TNL address;也可以将F1-U从Donor CU 1切换至donor DU 2侧,UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的DRB数据发送到Donor CU 2。这样利用原UE上下文创建新的上下文,可以节省信令开销。
方法三:Donor CU 2通过与migrating node建立new F1-C时发送F1建立响应消息(F1 Setup Response)来建立UE的新上下文。
在方法三中,F1 Setup Response中可携带多个UE在old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取old F1-C下的UE上下文并利用其在new F1-C中创建UE的新上下文。F1 Setup Response中还可以包含多个UE的服务小 区标识,migrating node用该小区标识替换原UE上下文中的服务小区标识。这样在F1建立时利用UE原来的上下文创建新的上下文,省去了单独为每个UE建立上下文的过程,可以节省信令开销以及信令时延。
1009,将建立上下文的UE迁移至Donor 2,通过原F1-C向UE发送RRC重配置消息。
由于Old F1-C在migrating node与Donor CU 1之间,并且经过Donor 2下的Donor DU 2和IAB-node 2转发,因此针对UE的RRC重配置消息的发送路径是:Donor CU 2→Donor CU 1→Donor DU 2→IAB-node 2→migrating node。
1010,切换后UE通过New F1-C发送RRC重配置完成消息给Donor CU 2,发送路径为:migrating node→IAB-node 2→Donor DU 2→Donor CU 2。
1011,Donor CU 2收到UE的RRC重配置完成消息后,发起针对UE的核心网路径切换。
由上述实施例可知,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,使得第一F1-C连接可经过第二Donor设备的DU进行转发,优化了第一F1-C连接的传输路径,同时,第二Donor设备还可以通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点重建立到第二Donor设备后立即建立第二F1-C连接,从而将UE迁移至第二Donor设备,实现donor之间的负载均衡。另外,在第二F1-C连接中建立UE上下文时,迁移节点仅需通过在第一F1-C连接中UE的第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,而无需使用现有的UE上下文建立过程,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在一些实施例中,迁移IAB节点从第一Donor设备切换到第二Donor设备,迁移节点在切换到第二Donor设备之后建立第二F1-C连接。第二Donor设备可以为该迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;或者,该第二Donor设备可以为该迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址,并且,使该迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址。
例如,第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息,以便第一Donor设备向该迁移IAB节点转发该第一RRC重配置消息。
该第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,由此,该迁移IAB节点可以使用该第四TNL地址与第二Donor设备的CU建立第二F1-C连接。或者,该第一RRC重配置消息包含切换命令和用于第一F1-C连接的第二TNL地址,由此,该迁移IAB节点可以将第一F1-C连接的第一TNL地址更新至第二TNL地址。
通过上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,指示更新第一F1-C连接TNL地址,使得第一F1-C连接可经过第二Donor的DU进行转发,优化了第一F1-C连接的传输路径,或者,第二Donor设备可通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点切换至第二Donor设备后立即建立第二F1-C连接,从而可实现后续对UE的迁移。
在上述实施例中,上述第一RRC重配置消息还可以包含:分配给迁移IAB节点的BAP地址;和/或,迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;和/或,用于迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址,使得F1-U连接可经过第二Donor的DU进行转发;和/或,用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,如果上述第一RRC重配置消息中不包含上述用于第二F1-C连接的第四TNL地址,也即不指示迁移IAB节点切换至第二Donor设备后立即建立第二F1-C连接,当迁移IAB节点切换到第二Donor一段时间之后,该第二Donor设备还可以向迁移IAB节点发送第三RRC重配置消息,该第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。由此,迁移IAB节点在接收到该第三RRC重配置消息后,可以使用上述第四TNL地址与第二Donor设备的CU建立第二F1-C连接。
在上述实施例中,第二Donor设备与迁移IAB节点建立第二F1-C连接后,为了将迁移IAB节点服务UE迁移至第二Donor,该第二Donor设备的CU可以使用上述第四TNL地址通过该第二F1-C连接向迁移IAB节点的DU发送第一消息,以便迁移IAB节点为其服务的UE建立第二上下文;该第一消息可以是F1建立响应、UE上下文建立请求或UE上下文修改请求消息。
作为一个示例,该第一消息可以包含上述UE的第一上下文标识,以便迁移IAB节点根据该第一上下文标识获取该UE的第一上下文并重用该第一上下文建立该UE 的第二上下文。
作为另一个示例,该第一消息还可以包含上述UE的服务小区配置信息,以便迁移IAB节点更新上述UE的服务小区配置。
通过上述实施例的方法,迁移节点仅需要根据第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,无需通过现有的UE上下文建立流程,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在上述实施例中,在迁移UE时,第二Donor设备还可以向第一Donor设备发送针对迁移IAB节点服务的UE的第二RRC重配置消息,以便该第一Donor设备使用上述第二TNL地址或使用上述第一TNL地址通过第一F1-C连接将该第二RRC重配置消息转发至迁移IAB节点。由此,该迁移IAB节点在接收到该第二RRC重配置消息后,可以将该第二RRC重配置消息发送给其服务的UE。
此外,该迁移IAB节点还可以接收其服务的UE发送的第二RRC重配置完成消息,并使用第四TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备。
由此,第二Donor设备还可以接收该迁移IAB节点使用前述第四TNL地址通过前述第二F1-C连接发送的第二RRC重配置完成消息。
在上述实施例中,第一Donor设备还可以使用上述第二TNL地址通过第一F1-C连接向迁移IAB节点发送的第二消息,该第二消息包含用于迁移IAB节点的F1-U连接的第六TNL地址,或者包含用于迁移IAB节点的F1-U连接的第六TNL地址以及用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。由此,迁移IAB节点可以将其F1-U连接的第五TNL地址更新为第六TNL地址,使得F1-U连接可经过第二Donor的DU进行转发,优化了F1-U连接的传输路径。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的第一F1-C连接的第二TNL地址,并将迁移IAB节点的第一F1-C连接的第一TNL地址更新为第二TNL地址,从而在第一Donor设备侧重定向第一F1-C,优化第一F1-C的传输路径。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的F1-U连接的第六TNL地址,并将该迁移IAB节点的F1-U连接的第五TNL地址更新为该第六TNL地址,从而在第一Donor设备侧重定向F1-U,优化F1-U的 传输路径。
在上述实施例中,如果是切换之前发送用于迁移IAB节点服务的UE的RRC重配置消息,则在第一Donor设备将迁移IAB节点的第一F1-C连接的第一TNL地址更新为第二TNL地址之前,该第一Donor设备可接收第二Donor设备发送的针对迁移IAB节点服务的UE的第二RRC重配置消息;使用第一TNL地址将该第二RRC重配置消息通过第一F1-C连接发送给迁移IAB节点,以便迁移IAB节点将第二RRC重配置消息转发给其服务的UE。
图11a和图11b是上述实施例的应用场景的示例图,图12是上述实施例的信息交互示意图。下面结合图11a和图11b和图12对上述实施例进行说明。
如图11a和图11b所示,migrating node从Donor 1切换到Donor 2下。由于是切换到Donor 2,最终需要与Donor 2建立F1-C。在图11a和图11b和图12的示例中,New F1-C使用从migrating node到donor 2的新传输路径。Old F1-C可能由原传输路径更新至新传输路径。由于New F1-C通过新传输路径建立,migrating node要先接入到Donor 1,再与Donor 2建立New F1-C。UE的切换完成(重配置完成)消息需要通过新F1-C发送给Donor 2,因此migrating node先于UE迁移至Donor 2。
如图12所示,该信息交互过程包括:
1201,Migrating node向Donor CU 1发送测量报告,Donor CU 1根据测量报告确定向Donor CU 2发起切换请求,Donor CU 1会向Donor CU 2发送migrating node及其服务的UE的上下文,Donor CU 2在IAB-node 2中为Migrating node建立上下文,然后向Donor CU 1发送切换请求响应,该切换请求响应中携带有RRCReconfiguration消息。
1202,Donor CU 1接收到切换请求响应后,向migrating node发送切换请求响应中携带的针对migrating node的RRCReconfiguration消息。因为改变连接到donor 2下,该消息内包含有donor 2分配给migrating node的BAP address,由于回传链路改变到IAB-node 2,所以还包含从migrating node到IAB-node 2的BH RLC信道配置,以及用于F1-C和非F1数据的BAP路由(默认路由)和BH RLC信道(默认BH信道)。
此外,因为Donor CU 1与migrating node之间建立的Old F1连接的接入锚点从IAB-node 1变为IAB-node 2,原F1数据可经过Donor 2下的Donor DU 2和IAB-node 2转发,即传输由原路径转换至新路径(即,migrating node→IAB-node 2→Donor DU →Donor CU 1),需要给migrating node配置适应Donor DU 2的子网地址,因此Donor CU 2为migrating node更新F1TNL地址。
与图9和图10的实施例不同的是,由于是基于切换准备的inter-donor migration过程,给UE的RRC重配置消息此时可能已经通过原F1-C发送至migrating node,因此原F1-C可能不需要转移至新路径,所以RRC重配置消息中包含Old F1-C的TNL address是可选的。
此外,此时UE的DRB数据仍然是通过F1-U(即,migrating node与Donor CU1之间建立的F1-U)发送到Donor CU 1,F1-U由原路径转到新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1)。为了最小化F1-U传输的中断时间,该消息内还可以包含F1-U的TNL address,指示更新F1-U的传输路径,使得migrating node可将F1-U立即转换到新路径传输。除此之外,还可以用该RRC重配置消息更新用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,通过该RRC重配置消息配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
在图12的示例中,对于New F1-C的建立有两种情况:
情况一:New F1-C在migrating node切换到Donor 2之后立刻建立。则上述RRC重配置消息还同时包含用于New F1-C的TNL address,以指示建立new F1-C。
情况二:migrating node切换到Donor 2之后不立刻迁移UE,因此New F1-C可以在migrating node完成一段时间之后才建立,则在后续RRC重配置消息中包含New F1-C的TNL address,见图12的操作1205之后的RRC重配置过程。
1203~1211的实施与图10的1003~1011相同,此处省略说明。需要说明的是,old F1-C重定向是可选的,并且在图12的示例中,1210(也即通过old F1-C向UE发送RRC重配置消息)可在1201之后立刻执行。
由上述实施例可知,第二Donor设备可通过RRC消息配置第一F1-C连接的TNL地址,指示更新第一F1-C连接TNL地址,使得第一F1-C连接可经过第二Donor设备的DU进行转发,优化了第一F1-C连接的传输路径,或者,第二Donor设备通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点切换至第二Donor设备后立即建立第二F1-C连接,从而将UE迁移至第二Donor设备,实现donor之间的负载均衡。另外,在第二F1-C连接中建立UE上下文时,迁移节点仅需通过在第 一F1-C连接中UE的第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,而无需使用现有的UE上下文建立消息,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在一些实施例中,迁移IAB节点从第一Donor设备切换到第二Donor设备,迁移节点在切换到第二Donor设备之前建立第二F1-C连接。第二Donor设备使该迁移IAB节点将用于第二F1-C连接的第三TNL地址更新至第四TNL地址。
例如,第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息,以便第一Donor设备向该迁移IAB节点转发该第一RRC重配置消息。该第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址。由此,该迁移IAB节点可以将第二F1-C连接的第三TNL地址更新至第四TNL地址。
通过上述实施例的方法,第二Donor设备通过RRC消息配置第二F1-C连接的TNL地址,指示更新第二F1-C连接TNL地址,使得第二F1-C连接可经过第二Donor的DU进行转发,优化了第二F1-C连接的传输路径。
在上述实施例中,上述第一RRC重配置消息还可以包含:分配给迁移IAB节点的BAP地址;和/或,迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;和/或,用于迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址,使得F1-U连接可经过第二Donor的DU进行转发;和/或,用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,在第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息之前,该第二Donor设备的CU可以使用上述第三TNL地址通过该第二F1-C连接向迁移IAB节点的DU发送第一消息,以便迁移IAB节点根据该第一消息为其服务的UE建立第二上下文。
作为一个示例,该第一消息可以包含上述UE的第一上下文标识,以便迁移IAB节点根据该第一上下文标识获取该UE的第一上下文并重用该第一上下文建立该UE的第二上下文。该第一消息可以是F1建立响应或UE上下文修改请求消息。
作为另一个示例,该第一消息还可以包含上述UE的服务小区配置信息,以便迁移IAB节点更新上述UE的服务小区配置。
通过上述实施例的方法,迁移节点仅需要根据第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,无需通过现有的UE上下文建立消息,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在上述实施例中,在迁移IAB节点接收第一RRC重配置消息之前,第一Donor设备还向迁移IAB节点发送第三RRC重配置消息,该第三RRC重配置消息包含用于第二F1-C连接的第三TNL地址。由此,该迁移IAB节点在接收到该第三RRC重配置消息后,可以使用该第三TNL地址与第二Donor设备的CU建立第二F1-C连接,从而可实现对UE的迁移。
在上述实施例中,在迁移UE时,第二Donor设备还可以向第一Donor设备发送针对迁移IAB节点服务的UE的第二RRC重配置消息,以便该第一Donor设备使用上述第一TNL地址通过第一F1-C连接将该第二RRC重配置消息转发至迁移IAB节点。由此,该迁移IAB节点在接收到该第二RRC重配置消息后,可以将该第二RRC重配置消息发送给其服务的UE。
此外,该迁移IAB节点还可以接收其服务的UE发送的第二RRC重配置完成消息,并使用第三TNL地址或第四TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备。
由此,如果在迁移节点切换之前发送用于迁移IAB节点服务的UE的RRC重配置完成消息,第二Donor设备还可以接收该迁移IAB节点使用前述第三TNL地址通过前述第二F1-C连接发送的第二RRC重配置完成消息;或者,迁移IAB节点切换之后发送用于迁移IAB节点服务的UE的RRC重配置完成消息,第二Donor设备接收迁移IAB节点使用第四TNL地址通过该第二F1-C连接发送的第二RRC重配置完成消息。
在上述实施例中,由于第一Donor设备分配第三TNL地址,第一Donor设备还可以向第二Donor设备发送用于迁移IAB节点建立第二F1-C连接的第三TNL地址。由此,第二Donor设备可以与迁移IAB节点建立第二F1-C连接。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的F1-U连接的第六TNL地址,将该迁移IAB节点的F1-U连接的第五TNL地址更新为第六TNL地址,从而在第一Donor设备侧重定向F1-U,优化F1-U的传输路径。
图13a和图13b是上述实施例的应用场景的示例图,图14是上述实施例的信息交互示意图。下面结合图13a和图13b和图14对上述实施例进行说明。
如图13a和图13b所示,migrating node从Donor 1切换到Donor 2下。与图11a和图11b和图12的示例相同,由于是切换到Donor 2,最终需要与Donor 2建立F1-C。与图11a和图11b和图12的示例不同的是,在图13a和图13b和图14的示例中,New F1-C通过原传输路径建立,然后再更新新传输路径。Old F1-C也可能由原传输路径更新至新传输路径。由于New F1-C是通过原传输路径建立,migrating node要在接入Donor 2之前建立New F1-C。这种情况下,UE可以先于migrating node迁移至donor 2。
如图14所示,该信息交互过程包括:
1401,Migrating node向Donor CU 1发送测量报告,Donor CU 1根据测量报告确定向Donor CU 2发起切换请求,Donor CU 1会向Donor CU 2发送migrating node及其服务的UE的上下文,Donor CU 2在IAB-node 2中为Migrating node建立上下文,然后向Donor CU 1发送切换请求响应,该切换请求响应中携带有RRCReconfiguration消息。
1402,Donor CU 1接收到切换请求响应后,Donor CU 1向migrating node发送该针对migrating node的RRCReconfiguration消息,用于建立New F1-C。RRC重配置消息包含用于New F1-C的TNL address以指示建立new F1-C。migrating node发送RRC重配置完成消息给Donor CU 1。
1403,因为通过原路径与Donor CU 2建立New F1-C(即,migrating node→IAB-node 1→Donor DU 1→Donor CU 2),Donor CU 1收到migrating node的RRC重配置完成后,对原路径上的节点配置BH RLC信道、BAP层路由以及BH RLC信道映射关系。
其中,操作1403可以在操作1401之后立刻执行,但本申请不限于此。
1404,Migrating node使用指示建立New F1-C的TNL address与donor CU 2建立New F1-C。
1405,为了将UE迁移至donor 2,在migrating node New F1-C中建立UE的上下文。这样UE在Old F1-C和New F1-C中分别有一套上下文,即对于UE,migrating node与donor CU 1和donor CU 2之间分别有一条F1AP信令连接。与donor CU 1的F1AP 信令连接用于向UE发送RRC重配置消息,与donor CU2的F1AP信令连接用于接收UE的RRC重配置完成消息。
其中,在migrating node的New F1-C中建立UE的上下文的方法有三种:
方法一:Donor CU 2通过New F1-C向migrating node发送F1AP消息,即UE上下文建立请求(UE context setup request)。
在方法一中,Migrating node可以为UE分配C-RNTI,将C-RNTI以及通过UE context setup response发送给Donor CU 2。
在方法一中,UE contxt setup request包含对UE DRB的F1-U配置,F1-U可以配置在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以配置在donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的F1-U从Donor CU 1转换至Donor CU 2。
方法二:Donor CU2通过New F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification)。
在方法二中,UE context modification中携带UE在Old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取Old F1-C下的UE上下文并利用其在New F1-C中创建新UE上下文。
在方法二中,由于migrating node切换到donor 2下要改变服务小区标识,所以UE context modification消息可以配置UE的服务小区标识,migrating node用该服务小区标识替换原UE上下文中的服务小区标识。
在方法二中,UE迁移到新服务小区可能更改C-RNTI,因此Migrating node为UE分配新C-RNTI,用新C-RNTI替换原C-RNTI。Migrating node将新C-RNTI通过UE context setup response发送给Donor CU2。这样利用原UE上下文创建新的上下文,可以节省信令开销。
在方法二中,UE contxt modification中可以对F1-U配置进行修改,修改的F1-U可以仍然在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以将F1-U从Donor CU 1切换至donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的DRB数据发送到Donor CU 2。
如果在1405中,UE的F1-U从Donor CU 1切换至Donor CU 2,则需要通过原路径与Donor CU 2传输F1-U(即传输路径为:migrating node→IAB-node 1→Donor DU  1→Donor CU 2)。
方法三:Donor CU 2通过与migrating node建立new F1-C时发送F1建立响应消息(F1 Setup Response)来建立新的UE上下文。
在方法三中,F1 Setup Response中可携带多个UE在old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取old F1-C下的UE上下文并利用其在new F1-C中创建新UE上下文。F1 Setup Response中还可以包含多个UE的服务小区标识,migrating node用该小区标识替换原UE上下文中的服务小区标识。这样在F1建立时利用UE原来的上下文创建新的上下文,省去了单独建立每个UE上下文的过程,可以节省信令开销以及信令时延。
1406,将建立上下文的UE迁移至Donor 2,Donor CU 1通过Old F1-C向UE发送RRC重配置消息。
其中,操作1406也可以在操作1401之后立即执行,但本申请不限于此。UE的RRC重配置发送路径是Donor CU 1→Donor DU 1→IAB-node 1→migrating node。
在操作1406中,UE可以通过New F1-C发送RRC重配置完成给Donor CU 2,由于New F1-C在migrating node与Donor CU 2之间,经过Donor 1下的Donor DU 1和IAB-node 1转发,即传输路径为:migrating node→IAB-node 1→Donor DU 1→Donor CU 2。
1407,Donor CU 2收到UE的RRC重配置完成后,发起针对UE的核心网路径切换。
1408,Donor CU 1向migrating node发送切换请求响应中携带的针对migrating node的RRCReconfiguration消息,用于将Migrating node切换至Donor 2,包含IAB-node 2下的目标小区和密钥更新信息。
其中,因为改变连接到donor 2下,该消息内还包含有donor 2分配给migrating node的BAP address,由于回传链路改变到IAB-node 2下,所以该消息还包含从migrating node到IAB-node 2的BH RLC信道配置,以及用于F1-C和非F1数据的BAP路由(默认路由)和新BH RLC信道(默认BH信道)。
其中,因为migrating node的F1连接的接入锚点从IAB-node 1变为IAB-node 2,原F1数据需要经过Donor 2下的Donor DU 2和IAB-node 2转发,即传输由原路径转换至新路径(即,migrating node→IAB-node 2→Donor DU 2),需要给migrating node 配置适应Donor DU 2的子网地址。因此Donor CU 2需为migrating node更新F1的TNL地址。New F1-C要转至新路径,更新new F1-C的TNL address。此外,因为此时UE已完成切换,所以Old F1-C无需转移至新路径。
其中,F1-U也由原路径转到新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1或Donor CU2)。为了最小化F1-U传输的中断时间,该消息内还可以包含F1-U的TNL address,使得migrating node可将F1-U立即转换到新路径传输。除此之外,还可以重新配置用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,该消息中配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
1409,Donor CU 2收到migrating node的RRC重配置完成后,发起针对migrating node的核心网路径切换。
1410,因为migrating node的New F1-C、Old F1-C以及F1-U的数据都需要经过新路径传输,Donor CU 2收到migrating node的RRC重配置完成后,对新路径上的节点配置BH RLC信道、BAP层路由以及BH RLC信道映射关系。
其中,操作1410可以在操作1401之后立刻执行,但本申请不限于此。
1411,New F1-C使用更新的TNL address,将New F1-C转换到新路径。此外,F1-U也可以使用更新后的TNL address将F1-U转换到新路径。
由上述实施例可知,第二Donor设备在迁移IAB节点切换之前通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点建立第二F1-C连接,从而将UE迁移至第二Donor设备,实现donor之间的负载均衡,同时在迁移IAB节点切换时通过RRC消息配置第二F1-C连接的TNL地址,以指示更新第二F1-C连接TNL地址,使得第二F1-C连接可经过第二Donor的DU进行转发,优化了第二F1-C连接的传输路径。另外,在第二F1-C连接中建立UE上下文时,迁移节点仅需通过在第一F1-C连接中UE的第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,而无需使用现有的UE上下文建立消息,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在一些实施例中,迁移IAB节点保持与第一Donor设备的连接并增加与第二Donor设备的空口连接,其中,迁移节点无需作为第二Donor设备下的DU工作,即 迁移IAB节点服务的UE无需迁移至第二Donor设备,迁移IAB节点无需建立第二F1-C。第二Donor设备为迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
例如,第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息,以便第一Donor设备向迁移IAB节点转发该第一RRC重配置消息。该第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第一F1-C连接的第二TNL地址。由此,迁移IAB节点可以为第一F1-C连接增加第二TNL地址。
根据上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,以指示增加第一F1-C连接TNL地址,使得第一F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第一F1-C连接转发的灵活性。
在上述实施例中,所述第一RRC重配置消息还可以包括:分配给迁移IAB节点的BAP地址;和/或,针对迁移IAB节点的辅小区组的回传RLC信道配置;和/或,用于第二F1-C连接的BAP路由标识和回传RLC信道标识;和/或,为迁移IAB节点的F1-U连接增加的第六TNL地址,使得F1-U连接可同时经过第一Donor和第二Donor的DU进行转发;和/或,用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,第一Donor设备可以接收第二Donor设备发送的迁移IAB节点的第一F1-C连接的第二TNL地址,并为迁移IAB节点的第一F1-C连接增加该第二TNL地址,从而在第一Donor设备侧重定向第一F1-C,增加第一F1-C的传输路径。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的F1-U连接的第六TNL地址,并为迁移IAB节点的F1-U连接增加该第六TNL地址。例如,第一Donor设备可以使用第一TNL地址或使用第二TNL地址通过第一F1-C连接向迁移IAB节点发送第二消息,该第二消息可以包括用于F1-U连接的第六TNL地址;和/或,用于F1-U连接的BAP路由标识和回传RLC信道标识。由此,迁移IAB节点可以将其F1-U连接的第五TNL地址更新为第六TNL地址,使得F1-U连接可同时经过第一Donor和第二Donor的DU进行转发,优化了F1-U连接的传输路径。
图15是上述实施例的应用场景的示例图,图16是上述实施例的信息交互示意图。下面结合图15和图16对上述实施例进行说明。
如图15所示,migrating node在从Donor 1移动到Donor 2下时,增加了一条新的传输路径,与Donor 1和Donor 2保持双连接(Dual-connection),即与Donor 2建立SCG连接,与Donor 1连接变为MCG连接。在图15和图16的示例中,迁移IAB节点不与Donor 2建立F1-C,且F1-C 2增加一条新的传输路径(或更新至新传输路径)。部分UE的F1AP消息通过原路径传输,部分UE的F1AP消息更新至新路径传输。
如图16所示,该信息交互流程包括:
1601,Migrating node向Donor CU 1发送测量报告,Donor CU 1根据测量报告确定向Donor CU 2发起增加Secondary node请求,Donor CU 1会向Donor CU 2发送migrating node及其服务的UE的上下文,Donor CU 2在IAB-node 2中为Migrating node建立上下文,然后向Donor CU 1发送增加Secondary node请求响应,该响应中携带有RRCReconfiguration消息。
1602,Donor CU 1接收到增加Secondary node请求响应后,向migrating node发送该响应中携带的针对migrating node的RRCReconfiguration消息。
其中,因为增加到Donor 2的SCG连接,该消息内包含有donor 2分配给migrating node的BAP address。F1-C通过新路径的两种传输方式为:
方式一:通过信令接入承载SRB传输F1-C;
方式二:通过BH RLC信道传输F1-C。
方式一的情况下无需增加回传链路配置,方式二的情况下需增加migrating node到IAB-node 2的回传链路,所以消息还包含从migrating node到IAB-node 2的BH RLC信道配置,以及需要增加新的传输路径(即,migrating node→IAB-node 2→Donor DU→Donor CU1),因此该消息还增加(或更新)用于F1-C和非F1数据的BAP路由和BH RLC信道配置。
此外,因为要增加IAB-node 2作为F1连接的接入锚点(或接入锚点切换至IAB-node 2),F1数据经过Donor 2下的Donor DU 2和IAB-node 2转发,需要给migrating node配置适应Donor DU 2的子网地址。因此Donor CU 2需为migrating node增加F1-C的TNL地址以增加F1-C的传输路径。其中,UE的F1AP信令通过Old F1-C发送至Donor CU 1,F1-C增加传输路径后,则部分UE的信令通过原路径发送,部分UE的信令可通过新路径发送。
此外,部分UE或所有UE的F1-U也由原路径转到新路径(migrating node→IAB-node 2→Donor DU 2→Donor CU 1或Donor CU2)。为了减少信令传输时延,最小化F1-U传输的中断时间,该RRC消息还可包含F1-U的TNL address,使得migrating node可将F1-U立即转换到新路径传输。除此之外,还可以配置用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,消息中配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
1603,Migrating node向Donor CU 1发送RRC重配置完成,Donor CU 1向Donor CU 2发送Secondary node重配置完成。
1604,Donor CU 2收到Secondary node重配置完成以及migrating node的随机接入后,发起针对migrating node的核心网路径更新。
1605,因为migrating node的F1-C以及F1-U的数据都需要经过新路径传输,Donor CU 2收到Secondary node重配置完成消息以及migrating随机接入后,对新路径上的节点更新BH RLC信道配置、BAP层路由以及BH RLC信道映射关系配置。
其中,操作1605可以在操作1601之后立刻执行,但本申请不限于此。
1606,为F1-C增加TNL address,把F1-C部分UE信令或全部UE信令转换到新路径。
例如,通过migrating node到IAB-node 2的信令接入承载SRB传输F1-C;或者通过migrating node到IAB-node 2的BH RLC信道传输F1-C。
1607,如果1602包含F1-U的TNL配置,则为F1-U增加TNL address,将F1-U部分UE DRB转换到新路径。
根据上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,以指示增加第一F1-C连接TNL地址,使得第一F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第一F1-C连接转发的灵活性。
在一些实施例中,迁移IAB节点保持与第一Donor设备的连接并增加与第二Donor设备的空口连接,迁移IAB节点在增加与第二Donor设备的空口连接之后建立第二F1-C。第二Donor设备为迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址或第三TNL地址,或者,第二Donor设备为迁移IAB节点增加用于第一F1-C 连接的第二TNL地址。
例如,第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息,以便第一Donor设备向迁移IAB节点转发该第一RRC重配置消息。
该第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,由此,迁移IAB节点可以使用该第四TNL地址或该第三TNL地址与第二Donor设备的CU建立第二F1-C连接;或者,该第一RRC重配置消息包含辅小区组(SCG)配置信息以及用于第一F1-C连接的第二TNL地址,由此,迁移IAB节点可以为第一F1-C增加第二TNL地址。
根据上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,指示更新第一F1-C连接TNL地址,使得第一F1-C连接可经过第二Donor的DU进行转发,优化了第一F1-C连接的传输路径,或者,第二Donor设备可通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点增加与第二Donor设备的空口连接后立即建立第二F1-C连接,从而可实现对UE的迁移。
在上述实施例中,第一RRC重配置消息还可以包括:分配给迁移IAB节点的BAP地址;和/或,针对迁移IAB节点的辅小区组的回传RLC信道配置;用于第二F1-C连接的BAP路由标识和回传RLC信道标识;为迁移IAB节点的F1-U连接增加的第六TNL地址,使得F1-U连接可同时经过第一Donor和第二Donor的DU进行转发;用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,如果上述第一RRC重配置消息中不包含上述用于第二F1-C连接的第四TNL地址,也即不指示迁移IAB节点增加与第二Donor设备的空口连接时建立第二F1-C连接,当迁移IAB节点增加与第二Donor设备的空口连接之后,该第二Donor设备还可以向迁移IAB节点发送第三RRC重配置消息,该第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。由此,迁移IAB节点在接收到该第三RRC重配置消息后,可以使用上述第四TNL地址与第二Donor设备的CU建立第二F1-C连接。
在上述实施例中,第二Donor设备与迁移IAB节点建立了第二F1-C连接后,为了将迁移IAB节点服务UE迁移至第二Donor,该第二Donor设备的CU可以使用上述第三TNL地址或上述第四TNL地址通过该第二F1-C连接向迁移IAB节点发送第一消息,以便迁移IAB节点根据该第一消息为其服务的UE建立第二上下文。
作为一个示例,上述第一消息包含该UE的第一上下文标识,以便迁移IAB节点根据该第一上下文标识获取上述UE的第一上下文并重用该第一上下文建立该UE的第二上下文;该第一消息可以是F1建立响应或UE上下文修改请求消息。
作为另一个示例,上述第一消息还包含该UE的服务小区配置信息,以便迁移IAB节点更新上述UE的服务小区配置。
通过上述实施例的方法,迁移节点仅需要根据第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,无需通过现有的UE上下文建立流程,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在上述实施例中,在迁移UE时,第二Donor设备还可以向第一Donor设备发送针对迁移IAB节点服务的UE的第二RRC重配置消息,以便第一Donor设备使用上述第一TNL地址或上述第二TNL地址通过第一F1-C连接将该第二RRC重配置消息转发给迁移IAB节点。由此,该迁移IAB节点在接收到该第二RRC重配置消息后,可以将该第二RRC重配置消息发送给其服务的UE。
此外,该迁移IAB节点还可以接收其服务的UE发送的第二RRC重配置完成消息,并使用第三TNL地址或第四TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备。
由此,第二Donor设备还可以接收该迁移IAB节点使用上述第三TNL地址通过第二F1-C连接发送的第二RRC重配置完成消息;或者,接收该迁移IAB节点使用上述第四TNL地址通过第二F1-C连接发送的第二RRC重配置完成消息。
在上述实施例中,作为一个示例,因为由第一Donor设备分配第三TNL地址,第一Donor设备还可以向第二Donor设备发送用于迁移IAB节点的第二F1-C连接的第三TNL地址。由此,第二Donor设备可以与迁移IAB节点建立第二F1-C连接。
在上述实施例中,作为另一个示例,第一Donor设备可以向第二Donor设备发送用于迁移IAB节点的第二F1-C连接的第三TNL地址,并接收第二Donor设备发送的用于迁移IAB节点的第一F1-C连接的第二TNL地址,并为迁移IAB节点的第一F1-C连接增加该第二TNL地址。由此,第二Donor设备可以与迁移IAB节点建立第二F1-C连接,并且在第一Donor设备侧增加第一F1-C的传输路径,使得第一F1-C的传输更灵活。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB 节点的F1-U连接的第六TNL地址,并为迁移IAB节点的F1-U连接增加第六TNL地址。例如,第一Donor设备可以使用第一TNL地址或使用第二TNL地址通过第一F1-C连接向迁移IAB节点发送第二消息,该第二消息可以包括用于F1-U连接的第六TNL地址;和/或,用于F1-U连接的BAP路由标识和回传RLC信道标识。由此,迁移IAB节点可以将其F1-U连接的第五TNL地址更新为第六TNL地址,使得第一Donor设备侧增加F1-U连接的传输路径,F1-U连接的传输更灵活。
在上述实施例中,如果迁移IAB节点增加与第二Donor设备的空口连接时第二Donor不指示建立第二F1-C连接,当迁移IAB节点增加与第二Donor的空口连接一段时间之后,第一Donor设备还可以向迁移IAB节点发送第三RRC重配置消息,该第三RRC重配置消息包含上述第三TNL地址。迁移IAB节点接收到该第三RRC重配置消息后,可以与所述第二Donor设备的CU建立第二F1-C连接。
图17a和图17b是上述实施例的应用场景的示例图,图18是上述实施例的信息交互示意图。下面结合图17a和图17b和图18对上述实施例进行说明。
如图17a和图17b所示,migrating node在从Donor 1移动到Donor 2下时,增加了一条新的传输路径,与Donor 1和Donor 2保持双连接(Dual-connection),即与Donor 2建立SCG连接,与Donor 1的连接变为MCG连接。在图17a和图17b和图18的示例中,Migrating node通过新传输路径或原路径与Donor 2建立New F1-C。Old F1-C可以增加一条新的传输路径。migrating node先与donor 2建立SCG连接,再建立New F1-C。由于UE的切换完成消息需要通过New F1-C发到donor 2,UE只能在migrating node与donor 2建立SCG连接后才能迁移到donor 2。
如图18所示,该信息交互流程包括:
1801,Migrating node向Donor CU 1发送测量报告,Donor CU 1根据测量报告确定向Donor CU 2发起增加Secondary node请求,Donor CU 1会向Donor CU 2发送migrating node及其服务的UE的上下文,Donor CU 2在IAB-node 2中为Migrating node建立上下文,然后向Donor CU 1发送增加Secondary node请求响应,该响应中携带有RRCReconfiguration消息。
1802,Donor CU 1接收到增加Secondary node请求响应后,向migrating node发送响应中携带的针对migrating node的RRCReconfiguration消息。
其中,因为增加到Donor 2的SCG连接,该消息内包含有donor 2分配给migrating  node的BAP address。新建F1-C(New F1-C)可以通过新传输路径建立(即,migrating node→IAB-node 2→Donor DU 2),需增加migrating node到IAB-node 2的回传链路,所以消息还包含从migrating node到IAB-node 2的BH RLC信道配置;由于需要增加新的传输路径(即migrating node→IAB-node 2→Donor DU 2→Donor CU1),因此该消息还增加(或更新)用于F1-C和非F1数据的BAP路由和BH RLC信道配置。如果Old F1-C通过新路径传输,有两种传输方式:
方式一:通过信令接入承载SRB传输F1-C;
方式二:通过BH RLC信道传输F1-C。
此外,如果增加IAB-node 2作为Old F1连接的接入锚点,Old F1数据经过Donor 2下的Donor DU 2和IAB-node 2转发,Donor 2给migrating node配置适应Donor DU 2的子网地址。因此Donor CU 2为migrating node增加Old F1-C的TNL地址。UE的F1AP信令通过Old F1-C发送,Old F1-C增加传输路径后,则可以部分UE的信令通过原路径发送,部分UE的信令通过新路径发送。
此外,部分UE或所有UE的F1-U也由原路径转到新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1或Donor CU2)。为了减少信令传输时延,最小化F1-U传输的中断时间,该RRC消息还可包含F1-U的TNL address,使得migrating node可将F1-U立即转换到新路径传输。除此之外,还可以配置用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,消息中配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
此外,对于新F1-C的建立有两种情况:
情况一:新F1-C在migrating node接入到Donor 2之后立刻建立。则上述RRC重配置消息还同时包含new F1-C的TNL address,以指示建立new F1-C。
情况二:migrating node接入到Donor 2之后不立刻迁移UE,因此New F1-C可以在migrating node完成一段时间之后才建立。则在后续RRC重配置中包含New F1-C的TNL address,见图18的操作1807之后的RRC重配置过程。
1803,Migrating node向Donor CU 1发送RRC重配置完成,Donor CU 1向Donor CU 2发送Secondary node重配置完成。
1804,Donor CU 2收到Secondary node重配置完成以及migrating node的随机接 入后,发起针对migrating node的核心网路径更新。
1805,因为migrating node的New F1-C、Old F1-C以及F1-U的数据都需要经过新路径传输,Donor CU 2收到Secondary node重配置完成消息即migrating node的随机接入后,对新路径上的节点更新BH RLC信道配置、BAP层路由以及BH RLC信道映射关系配置。
其中,操作1805可以在操作1801之后立刻执行,但本申请不限于此。
1806,如果OldF1-C同时通过原路径和新路径传输,Old F1-C增加TNL address,Old F1-C中的部分UE信令或全部UE信令转换到新路径。
例如,通过migrating node到IAB-node 2的信令接入承载SRB传输Old F1-C;或者,通过migrating node到IAB-node 2的BH RLC信道传输Old F1-C。
1807,如果操作1802包含F1-U的TNL配置,则F1-U增加TNL address,将F1-U部分UE DRB转换到新路径。
1808,Migrating node使用指示建立New F1-C的TNL address与donor CU 2建立New F1-C。
1809,如果操作1802中RRC重配置消息不包含F1-U的配置信息,Donor CU 1通过Old F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification)。通过该消息增加F1-U的TNL address,使得F1-U增加新路径,还可通过该消息修改F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
其中,操作1809可以在操作1805后立即执行,但本申请不限于此。
1810,为了将UE迁移至donor 2,在migrating node的New F1-C中建立UE的上下文,这样UE在Old F1-C和New F1-C中分别有一套上下文,即对于UE,migrating node与donor CU 1和donor CU 2之间分别有一条F1AP信令连接。与donor CU 1的F1AP信令连接用于向UE发送RRC重配置消息,与donor CU2的F1AP信令连接用于接收UE的RRC重配置完成消息。
其中,在migrating node新F1-C中建立UE的上下文的方法有三种。
方法一:Donor CU 2通过New F1-C向migrating node发送F1AP消息UE context setup request来建立新的UE上下文。Migrating node为UE分配C-RNTI,将C-RNTI 以及通过UE context setup response发送给Donor CU2。
在方法一中,UE contxt setup包含对UE DRB的F1-U配置,F1-U可以配置在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以配置在donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的F1-U从Donor CU 1切换至Donor CU 2。
方法二:Donor CU2通过New F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification)来建立新的UE上下文。
在方法二中,UE context modification中携带UE在Old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取Old F1-C中的UE上下文并利用其在New F1-C中创建新UE上下文。
在方法二中,由于migrating node切换到donor 2下要改变服务小区标识,UE context modification可重配UE的服务小区标识,migrating node用该小区标识替换原UE上下文中的服务小区标识。
在方法二中,UE改变服务小区可能改变C-RNTI,因此Migrating node为UE分配新C-RNTI,并用新C-RNTI替换原C-RNTI。Migrating node将新C-RNTI以及通过UE context setup response发送给Donor CU2。这样利用原UE上下文创建新的上下文,可以节省信令开销。
在方法二中,UE contxt modification中可以对F1-U配置进行修改,修改的F1-U可以仍然在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以将F1-U从Donor CU 1切换至donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的DRB数据发送到Donor CU 2。
方法三:Donor CU2通过与migrating node建立new F1-C时发送F1建立响应消息(F1 Setup Response)来建立UE的新上下文。
在方法三中,F1 Setup Response中可携带多个UE在old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取old F1-C下的UE上下文并利用其在new F1-C中创建UE的新上下文。F1 Setup Response中还可以包含多个UE的服务小区标识,migrating node用该小区标识替换原UE上下文中的服务小区标识。这样在F1建立时利用UE原来的上下文创建新的上下文,省去了单独为每个UE建立上下文的过程,可以节省信令开销以及信令时延。
1811,将建立上下文的UE迁移至Donor 2,通过Old F1-C向UE发送RRC重配置消息。
其中,操作1811可以在操作1801之后立即执行,但本申请不限于此。
在1811中,Old F1-C可以经过原路径也可以经过新路径转发,例如UE的RRC重配置消息的发送路径是Donor CU 2→Donor CU 1→Donor DU 2→IAB-node 2→migrating node。
在1811中,迁移后UE的RRC重配置完成消息通过New F1-C的原路径或新路径转发给Donor CU 2,例如是migrating node→IAB-node 2→Donor DU 2→Donor CU 2。
1812,Donor CU 2收到UE的RRC重配置完成后,发起针对UE的核心网路径切换。
通过上述实施例的方法,第二Donor设备通过RRC消息配置第一F1-C连接的TNL地址,以指示增加第一F1-C连接TNL地址,使得第一F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第一F1-C传输的灵活性,或者,第二Donor设备可通过RRC消息配置第二F1-C连接的TNL地址,使得迁移IAB节点增加与第二Donor设备的空口连接后立即建立第二F1-C连接,从而可实现对UE的迁移。另外,在第二F1-C连接中建立UE上下文时,迁移节点仅需通过在第一F1-C连接中UE的第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,而无需使用现有的UE上下文建立消息,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
在一些实施例中,迁移IAB节点保持与第一Donor设备的空口连接并增加与第二Donor设备的空口连接,迁移节点在与第二Donor设备增加空口连接之前建立第二F1-C连接。第二Donor设备为迁移IAB节点增加用于第二F1-C连接的第四TNL地址;或者,为迁移IAB节点增加用于第二F1-C连接的第四TNL地址,以及为迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
例如,第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息,以便第一Donor设备向迁移IAB节点转发该第一RRC重配置消息。
该第一RRC重配置消息包括辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址,由此,迁移IAB节点可以为第二F1-C连接增加第四TNL地址;或 者,该第一RRC重配置消息包括辅小区组(SCG)配置信息、用于第二F1-C连接的第四TNL地址和用于第一F1-C连接的第二TNL地址,由此,迁移IAB节点可以为第二F1-C连接增加第四TNL地址并为第一F1-C增加第二TNL地址。
根据上述实施例的方法,第二Donor设备通过RRC消息配置第二F1-C连接的TNL地址,指示增加第二F1-C连接TNL地址,使得第二F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第二F1-C的转发灵活性;另外,第二Donor设备还通过RRC消息配置第一F1-C连接的TNL地址,指示增加第一F1-C连接TNL地址,使得第一F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第二F1-C的转发灵活性。
在上述实施例中,第一RRC重配置消息还可以包括:分配给迁移IAB节点的BAP地址;和/或,针对迁移IAB节点的辅小区组的回传RLC信道配置;用于第二F1-C连接的BAP路由标识和回传RLC信道标识;为迁移IAB节点的F1-U连接增加的第六TNL地址,使得F1-U连接可同时经过第一Donor和第二Donor的DU进行转发;用于迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在上述实施例中,在第二Donor设备向第一Donor设备发送针对迁移IAB节点的第一RRC重配置消息之前,第二Donor设备的CU还可以使用上述第三TNL地址或上述第四TNL地址通过第二F1-C连接向迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点根据该第一消息为其服务的UE建立第二上下文。
作为一个示例,该第一消息包含UE的第一上下文标识,以便迁移IAB节点根据该第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文。该第一消息可以是F1建立响应或UE上下文修改请求消息。
作为另一个示例,该第一消息还包含UE的服务小区配置信息,以便迁移IAB节点更新上述UE的服务小区配置。
在上述实施例中,在迁移IAB节点接收上述第一RRC重配置消息之前,第一Donor设备还向该迁移IAB节点发送第三RRC重配置消息,该第三RRC重配置消息中包含用于第二F1-C连接的第三TNL地址。由此,该迁移IAB节点接收到该第三RRC重配置消息后,可以使用该第三TNL地址与第二Donor设备的CU建立第二F1-C连接,从而可实现对UE的迁移。
在上述实施例中,在迁移UE时,第二Donor设备还可以向第一Donor设备发送 针对迁移IAB节点服务的UE的第二RRC重配置消息,以便该第一Donor设备使用第一TNL地址通过第一F1-C连接将该第二RRC重配置消息转发至迁移IAB节点。由此,该迁移IAB节点在接收到该第二RRC重配置消息后,可以将该第二RRC重配置消息发送给其服务的UE。
此外,该迁移IAB节点还可以接收其服务的UE发送的第二RRC重配置完成消息,如果在迁移节点增加空口连接之前发送用于迁移IAB节点服务的UE的第二RRC重配置完成消息,使用第三TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备;如果在迁移节点增加空口连接之后发送用于迁移IAB节点服务的UE的第二RRC重配置完成消息,则使用第三TNL地址或第四TNL地址通过第二F1-C连接将该第二RRC重配置完成消息发送给第二Donor设备。
由此,该第二Donor设备还可以接收该迁移IAB节点使用上述第三TNL地址或上述第四TNL地址通过第二F1-C连接发送的第二RRC重配置完成消息。
在上述实施例中,作为一个示例,由于第一Donor设备分配第三TNL地址,第一Donor设备还可以向第二Donor设备发送用于迁移IAB节点的第二F1-C连接的第三TNL地址。由此,第二Donor设备可以与迁移IAB节点建立第二F1-C连接。
在上述实施例中,作为另一个示例,第一Donor设备可以向第二Donor设备发送用于迁移IAB节点的第二F1-C连接的第三TNL地址,并接收第二Donor设备发送的用于迁移IAB节点的第一F1-C连接的第二TNL地址,并为迁移IAB节点的第一F1-C连接增加该第二TNL地址。由此,第二Donor设备可以与迁移IAB节点建立第二F1-C连接,并在第一Donor设备侧增加第一F1-C的传输路径,提高转发第一F1-C的灵活性。
在上述实施例中,第一Donor设备还可以接收第二Donor设备发送的迁移IAB节点的F1-U连接的第六TNL地址,并为迁移IAB节点的F1-U连接增加第六TNL地址。例如,第一Donor设备可以使用第一TNL地址或使用第二TNL地址通过第一F1-C连接向迁移IAB节点发送第二消息,该第二消息可以包括用于F1-U连接的第六TNL地址;和/或,用于F1-U连接的BAP路由标识和回传RLC信道标识。由此,迁移IAB节点可以将其F1-U连接的第五TNL地址更新为第六TNL地址,在第一Donor设备侧增加F1-U的传输路径,提高转发F1-U的灵活性。
图19a和图19b是上述实施例的应用场景的示例图,图20是上述实施例的信息 交互示意图。下面结合图19a和图19b和图20对上述实施例进行说明。
如图19a和图19b所示,migrating node在从Donor 1移动到Donor 2下时,增加了一条新的传输路径,与Donor 1和Donor 2保持双连接(Dual-connection),即与Donor 2建立SCG连接,与Donor 1连接变为MCG连接。在图19a和图19b和图20的示例中,与Donor 2通过原传输路径建立New F1-C连接,然后New F1-C增加一条新传输路径。Old F1-C也可以增加一条新传输路径。由于New F1-C通过原路径建立,UE可以在migrating node与donor 2建立SCG连接之前,迁移到Donor 2。
如图20所示,该信息交互过程包括:
2001,Migrating node向Donor CU 1发送测量报告,Donor CU 1根据测量报告确定向Donor CU 2发起增加Secondary node请求,Donor CU 1会向Donor CU 2发送migrating node及其服务的UE的上下文,Donor CU 2在IAB-node 2中为Migrating node建立上下文,然后向Donor CU 1发送增加Secondary node请求响应,该响应中携带有RRCReconfigurationg消息。
2002,Donor CU 1接收到增加Secondary node请求响应后,向migrating node发送该响应中携带的针对migrating node的RRC重配置消息,用于建立New F1-C。RRC重配置消息包含用于New F1-C的TNL address并指示建立New F1-C,以指示建立new F1-C。migrating node发送RRC重配置完成消息给Donor CU 1。
2003,因为需要通过原路径与Donor CU 2建立New F1-C(即,migrating node→IAB-node 1→Donor DU 1→Donor CU 2),Donor CU 1收到migrating node的RRC重配置完成后,对原路径上的节点配置BH RLC信道、BAP层路由以及BH RLC信道映射关系。
其中,操作2003可以在操作2001之后立刻执行,但本申请不限于此。
2004,Migrating node使用指示建立New F1-C的TNL address与donor CU 2建立New F1-C。
其中,New F1-C通过新路径传输有两种传输,即:
1)通过信令接入承载SRB传输F1-C;
2)通过BH RLC信道传输F1-C。
2005,为了将UE迁移至donor 2,在migrating node的New F1-C中建立UE的上下文,这样UE在原F1-C和新F1-C中分别有一套上下文,即对于UE,migrating node 与donor CU 1和donor CU 2之间分别有一条F1AP信令连接。与donor CU 1的F1AP信令连接用于向UE发送RRC重配置消息,与donor CU2的F1AP信令连接用于接收UE的RRC重配置完成消息。
在migrating node的New F1-C中建立UE的上下文的方法有三种:
方法一:Donor CU 2通过New F1-C向migrating node发送F1AP消息,即UE上下文建立请求(UE context setup request)来建立UE的新上下文。
在方法一中,Migrating node为UE分配C-RNTI,将C-RNTI以及通过UE context setup response发送给Donor CU2。
在方法一中,UE contxt setup包含对UE DRB的F1-U配置,F1-U可以配置在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以配置在donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的F1-U从Donor CU 1转换至Donor CU 2。
方法二:Donor CU2通过New F1-C向migrating node发送F1AP消息,即UE上下文修改(UE context modification)来建立新的UE上下文。
在方法二中,UE context modification中携带UE在Old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取Old F1-C下的UE上下文并利用其在New F1-C中创建新UE上下文。
在方法二中,由于migrating node迁移到donor 2下要改变服务小区标识,所以UE context modification消息可以配置UE的服务小区标识,migrating node用该小区标识替换原UE上下文中服务小区标识。
在方法二中,UE改变服务小区可能更改C-RNTI,因此Migrating node为UE分配新C-RNTI,用新C-RNTI替换原C-RNTI。Migrating node将新C-RNTI通过UE context setup response发送给Donor CU2。这样利用原UE上下文创建新的上下文,可以节省信令开销。
在方法二中,UE contxt modification中可以对F1-U配置进行修改,修改的F1-U可以仍然在donor CU1侧,此时UE的DRB使用Donor CU 1的UL TNL address;也可以将F1-U从Donor CU 1切换至donor DU 2侧,此时UE DRB使用Donor CU 2的UL TNL address,之后migrating node将UE的DRB数据发送到Donor CU 2。
其中,如果在操作2005中,UE的F1-U从Donor CU 1切换至Donor CU 2,则需 要通过原路径与Donor CU 2传输F1-U,即传输路径为:migrating node→IAB-node 1→Donor DU 1→Donor CU 2。
方法三:Donor CU2通过与migrating node建立new F1-C时发送F1建立响应消息(F1 Setup Response)来建立UE的新上下文。
在方法三中,F1 Setup Response中可携带多个UE在old F1-C中的上下文标识,migrating node可以根据UE的上下文标识获取old F1-C下的UE上下文并利用其在new F1-C中创建新UE上下文。F1 Setup Response中还可以包含多个UE的服务小区标识,migrating node用UE该小区标识替换原UE上下文中的服务小区标识。这样在F1建立时利用UE原来的上下文创建新的上下文,省去了单独建立每个UE上下文的过程,可以节省信令开销以及信令时延。
2006,将建立上下文的UE迁移至Donor 2,Donor CU 1通过Old F1-C的原路径向UE发送RRC重配置消息,即Donor CU 1→Donor DU 1→IAB-node 1→migrating node。
其中,操作2006可以在操作2001后立即执行,但本申请不限于此。
在操作2006中,迁移后UE通过New F1-C发送RRC重配置完成给Donor CU 2,如果在增加新空口连接之前发送RRC重配置完成,要经过Donor 1下的Donor DU 1和IAB-node 1转发,即传输路径为:migrating node→IAB-node 1→Donor DU 1→Donor CU 2;如果增加新空口连接之后发送RRC重配置完成,可同时经过Donor 1和Donor2的DU转发。
2007,Donor CU 2收到UE的RRC重配置完成后,发起针对UE的核心网路径切换。
2008,Donor CU 1向migrating node发送增加Secondary node请求响应中携带的RRCReconfiguration消息。
其中,因为增加到Donor 2的SCG连接,该消息内包含有donor 2分配给migrating node的BAP address。New F1-C通过新传输路径传输(即,migrating node→IAB-node 2→Donor DU 2),增加migrating node到IAB-node 2的回传链路,所以消息中还包含从migrating node到IAB-node 2的BH RLC信道配置。此外,由于需要增加新的传输路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU1),因此该消息还增加(或更新)用于F1-C和非F1数据的BAP路由和BH RLC信道配置。
其中,如果Old F1-C通过新路径传输,有两种传输方式:
方式一:通过信令接入承载SRB传输F1-C;
方式二:通过BH RLC信道传输F1-C。
此外,要增加IAB-node 2作为F1连接的接入锚点,F1数据经过Donor 2下的Donor DU 2和IAB-node 2转发,需要给migrating node配置适应Donor DU 2的子网地址。因此Donor CU 2需为migrating node增加F1-C的TNL地址。
也即UE的F1AP信令通过New F1-C发送时,若New F1-C应增加TNL地址,new F1-C增加路径,则可以部分UE的信令通过原路径发送,部分UE的信令通过新路径发送。
在2008中,部分UE或所有UE的F1-U也由原路径转到新路径(即,migrating node→IAB-node 2→Donor DU 2→Donor CU 1或Donor CU2)。为了减少信令传输时延,最小化F1-U传输的中断时间,该RRC消息还可包含F1-U的TNL address,使得migrating node可将F1-U立即转换到新路径传输。除此之外,还可以配置用于F1-U的BAP路由和BH RLC信道映射关系,例如,具体来说,消息中配置每个UE的RLC信道使用的BAP路由,以及配置UE ID、UE的RLC信道到migrating node的回传RLC信道的对应关系。
2009,Migrating node向Donor CU 1发送RRC重配置完成,Donor CU 1向Donor CU 2发送Secondary node重配置完成。
2010,Donor CU 2收到Secondary node重配置完成以及migrating node的随机接入后,发起针对migrating node的核心网路径更新。
2011,因为migrating node的新F1-C以及F1-U的数据都需要经过新路径传输,Donor CU 2收到Secondary node重配置完成消息即migrating node的随机接入后,对新路径上的节点更新BH RLC信道配置、BAP层路由以及BH RLC信道映射关系配置。
其中,操作2011可以在操作2001之后立刻执行,但本申请不限于此。
2012,New F1-C增加TNL address,New F1-C的部分UE信令或全部UE信令转换到新路径。如果Old F1-C可通过新路径传输,Old F1-C增加TNL address,Old F1-C的部分UE信令或全部UE信令转换到新路径。
例如,通过migrating node到IAB-node 2的信令接入承载SRB传输Old F1-C;或 者,通过migrating node到IAB-node 2的BH RLC信道传输Old F1-C。
2013,如果操作2008包含F1-U的TNL配置则F1-U增加TNL address,migrating node将F1-U部分UE DRB转换到新路径。
根据上述实施例的方法,迁移IAB节点增加与第二Donor设备的空口连接时,第二Donor设备通过RRC消息配置第二F1-C连接的TNL地址,指示增加第二F1-C连接TNL地址,使得第二F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第二F1-C的转发灵活性;另外,第二Donor设备还通过RRC消息配置第一F1-C连接的TNL地址,指示增加第一F1-C连接TNL地址,使得第一F1-C连接可同时经过第一Donor和第二Donor的DU进行转发,提高了第二F1-C的转发灵活性。另外,在第二F1-C连接中建立UE上下文时,迁移节点仅需通过在第一F1-C连接中UE的第一上下文标识获取该UE的第一上下文并重用该第一上下文建立UE的第二上下文,而无需使用现有的UE上下文建立消息,可以降低UE上下文建立中的信令开销以及时延,提高信令效率。
值得注意的是,以上附图9-20仅对本申请实施例进行了示意性说明,但本申请不限于此。例如可以适当地调整各个操作之间的执行顺序,此外还可以增加其他的一些操作或者减少其中的某些操作。本领域的技术人员可以根据上述内容进行适当地变型,而不仅限于上述附图9-20的记载。
此外,以上各个实施例仅对本申请实施例进行了示例性说明,但本申请不限于此,还可以在以上各个实施例的基础上进行适当的变型。例如,可以单独使用上述各个实施例,也可以将以上各个实施例中的一种或多种结合起来。
根据本申请实施例的方法,如前所述,一方面,能够实现Donor设备之间的负载均衡,另一方面,优化了原F1-C连接以及新F1-C连接的转发路径。
第二方面的实施例
本申请实施例提供一种群组迁移装置。
图21是本申请实施例的群组迁移装置的一个示意图,该装置例如可以是IAB系统中的Donor设备,也可以是配置于该Donor设备中的某个或某些部件或者组件。该IAB系统包括Donor设备和IAB节点,IAB节点从第一Donor设备移动到第二Donor设备,本申请实施例从第二Donor设备的一侧进行说明。其中,本申请实施例的群组 迁移装置的实施原理与第一方面的实施例中第二Donor设备的实施类似,内容相同之处不再重复说明。
如图21所示,本申请实施例的群组迁移装置2100包括:
处理单元2101,在迁移IAB节点从第一Donor和移动到第二Donor设备时,所述第二Donor设备进行以下处理的至少一种:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;
使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在本申请实施例中,迁移IAB节点从第一Donor设备移动到第二Donor设备,是指以下情况之一:
情况一:所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
情况二:所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
情况三:所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
在情况一中,在所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,所述处理单元2101进行以下处理:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;以及
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址。
在上述实施例中,所述迁移IAB节点重建立到所述第二Donor设备之后,所述 处理单元2101向所述迁移IAB节点发送第一RRC重配置消息,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于所述第二F1-C连接的第四TNL地址。
在一些实施例中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于F1-U的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在上述实施例中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述第二Donor设备向所述迁移IAB节点发送第一RRC重配置消息之后,所述处理单元向所述IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
在上述实施例中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述处理单元2101(例如配置于所述第二Donor设备的CU)使用所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
在一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点服务的UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;此外,所述处理单元2101还接收所述迁移IAB节点使用所述第四TNL地址 通过所述第二F1-C连接发送的第二RRC重配置完成消息。
在情况二中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述处理单元2101进行以下处理:
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;或者,
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址,并且,使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,或者,所述第一RRC重配置消息包含切换命令和用于所述第一F1-C连接的第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,若所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点切换至所述第二Donor之后,所述处理单元2101向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
在一些实施例中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述处理单元2101(例如配置于所述第二Donor设备的CU)使用所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
在另一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点服务的UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第二TNL地址或使用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;此外,所述处理单元2101还接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
在情况二中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述第二Donor设备进行以下处理:
使所述迁移IAB节点将用于第二F1-C连接的第三TNL地址更新至所述第四TNL地址。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息,所述第一RRC重配置消息包括切换命令和所述用于第二F1-C连接的第四TNL地址。
在一些实施例中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,在所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息之前,所述处理单元2101(例如配置于所述第二 Donor设备的CU)使用所述第三TNL地址通过所述第二F1-C连接向所述迁移IAB节点DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
在另一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发给所述迁移IAB节点;此外,所述处理单元2101还接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述处理单元2101进行以下处理:
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于所述第一F1-C连接的第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述处理单元2101进行以下处理:
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址或第三TNL地址;或者,
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息以及用于所述第一F1-C连接的第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在一些实施例中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点增加与所述第二Donor设备的空口连接之后,所述处理单元2101向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
在一些实施例中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述处理单元2101(例如配置于所述第二Donor设备的CU)使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
在另一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址或所述第 二TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发给所述迁移IAB节点;所述处理单元2101还接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述处理单元2101进行以下处理:
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;或者,
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址,以及为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息,所述第一RRC重配置消息包括辅小区组(SCG)配置信息和用于所述第二F1-C连接的第四TNL地址,或者,所述第一RRC重配置消息包括辅小区组(SCG)配置信息、用于所述第二F1-C连接的第四TNL地址和用于所述第一F1-C连接的第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在一些实施例中,在所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息之前,所述处理单元2101(例如配置于所述第二Donor设备的CU)使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文 建立所述第二上下文。
在另一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,所述处理单元2101向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;所述处理单元2101还接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
值得注意的是,以上仅对与本申请相关的各部件或模块进行了说明,但本申请不限于此。本申请实施例的群组迁移装置2100还可以包括其它部件或者模块,关于这些部件或者模块的具体内容,可以参考相关技术。
此外,为了简单起见,图21中仅示例性示出了各个部件或模块之间的连接关系或信号走向,但是本领域技术人员应该清楚的是,可以采用总线连接等各种相关技术。上述各个部件或模块可以通过例如处理器、存储器、发射机、接收机等硬件设施来实现;本申请实施并不对此进行限制。
根据本申请实施例,如前所述,一方面,能够实现Donor设备之间的负载均衡,另一方面,优化了原F1-C连接以及新F1-C连接的转发路径。
第三方面的实施例
本申请实施例提供一种群组迁移装置。
图22是本申请实施例的群组迁移装置的一个示意图,该装置例如可以是IAB系统中的IAB节点,也可以是配置于该IAB节点中的某个或某些部件或者组件。该IAB系统包括Donor设备和IAB节点,IAB节点从第一Donor设备移动到第二Donor设备,该IAB节点称为迁移IAB节点,本申请实施例从该迁移IAB节点的一侧进行说明。其中,本申请实施例的群组迁移装置的实施原理与第一方面的实施例中的迁移IAB节点的实施类似,内容相同之处不再重复说明。
如图22所示,本申请实施例的群组迁移装置2200包括:
接收单元2201,其从所述第一Donor设备接收所述第二Donor设备发送的第一RRC重配置消息,所述第一RRC重配置消息包括以下至少一项:
用于第一F1-C的第二TNL地址,以将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址,或为所述第一F1-C连接增加所述第二TNL地址;
用于第二F1-C的第四TNL地址,以将所述第二F1-C连接的第三TNL地址更新至所述第四TNL地址,或使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接,或为所述第二F1-C连接增加所述第四TNL地址;
用于第二F1-C连接的第三TNL地址,以为所述第二F1-C连接增加所述第三TNL地址,或使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,是指以下情况之一:
情况一:所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
情况二:所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
情况三:所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
在情况一中,所述迁移IAB节点重建立到所述第二Donor设备之后,所述接收单元2201接收所述第一RRC重配置消息;
所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址;
或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于第二F1-C连接的第四TNL地址,所述迁移IAB节点将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址并且使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于F1-U的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,所述接收单元2201接收所述第一RRC重配置消息之后,还接收所述第二Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
在上述实施例中,如图22所示,所述装置2200还包括:
第一建立单元2202,其使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,第一建立单元2202与所述第二Donor设备建立第二F1-C连接;接收单元2201接收所述第二Donor设备的CU使用所述第四TNL地址通过所述第二F1-C连接发送的第一消息。
在上述实施例中,如图22所示,所述装置2200还包括:
第二建立单元2203,其根据所述第一消息为其服务的UE建立第二上下文。
在一些实施例中,所述第一消息包含所述UE的第一上下文标识,所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
在一些实施例中,所述第一消息还包含所述UE的服务小区配置信息。
在一些实施例中,如图22所示,该装置2200还包括:发送单元2204。
在上述实施例中,所述接收单元2201接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,所述发送单元2204将所述第二RRC重配置消息发送给其服务的UE。
在上述实施例中,所述接收单元2201还接收其服务的UE发送的第二RRC重配置完成消息,所述发送单元2204使用所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
在一些实施例中,所述接收单元2201接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接发送的第二消息,所述第二消息包含用于F1-U的第六TNL地址,或者包含用于F1-U的第六TNL地址以及用于F1-U的BAP路由标识和回传RLC信道标识。
在上述实施例中,如图22所示,该装置2200还包括:
处理单元2205,其将所述F1-U的第五TNL地址更新为所述第六TNL地址。
在情况二中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述接收单元2201接收所述第一RRC重配置消息。
在一些实施例中,所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,则所述第一建立单元2202使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述第一RRC重配置消息包含切换命令和用于第一F1-C连接的第二TNL地址,则所述处理单元2205将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在一些实施例中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点切换至所述第二Donor设备之后,所述接收单元2201接收所述第二Donor设备发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址;所述第一建立单元2202 使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述接收单元2201接收所述第一Donor设备使用所述第二TNL地址或使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB服务的UE的第二RRC重配置消息,所述发送单元2204将所述第二RRC重配置消息发送给其服务的UE。
在上述实施例中,所述接收单元2201接收所述IAB节点服务的UE发送的第二RRC重配置完成消息,所述发送单元2204使用所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
在一些实施例中,若所述第一RRC重配置消息包含所述第二TNL地址,所述接收单元2201接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接发送的第二消息,所述第二消息包含用于F1-U的第六TNL地址,或者包含用于F1-U的第六TNL地址以及用于F1-U的BAP路由标识和回传RLC信道标识;
所述处理单元2205将所述F1-U的第五TNL地址更新为所述第六TNL地址。
在情况二中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述接收单元2201接收所述第一RRC重配置消息,所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址;所述处理单元2205将所述第二F1-C连接的第三TNL地址更新为所述第四TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在一些实施例中,在所述迁移IAB节点接收所述第一RRC重配置消息之前,所述接收单元2201接收所述第一Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于所述第二F1-C的第三TNL地址;所述第一建立单元2202使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述接收单元2201接收所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,所述发送单元2204所述第二RRC重配置消息发送给其服务的UE。
在上述实施例中,所述接收单元2201接收所述IAB节点服务的UE发送的第二RRC重配置完成消息,所述发送单元2204使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元2201接收所述第一RRC重配置消息;其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于所述第一F1-C连接的第二TNL地址,所述处理单元2205为所述第一F1-C连接增加所述第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元2201接收所述第一RRC重配置消息。
在一些实施例中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,所述第一建立单元2202使用所述第四TNL地址或所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息以 及用于所述第一F1-C连接的第二TNL地址,所述处理单元2205为所述第一F1-C增加所述第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在情况三中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C的第四TNL地址,所述迁移IAB节点增加与所述第二Donor设备的空口连接之后,所述接收单元2201接收所述第二Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于所述第二F1-C的第四TNL地址;所述第一建立单元2202使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述接收单元2201接收所述第一Donor设备使用所述第一TNL地址或所述第二TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE。
在上述实施例中,所述接收单元2201接收所述IAB节点服务的UE发送的第二RRC重配置完成消息,所述发送单元2204使用所述第三TNL地址或第所述四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
在情况三中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元2201接收所述第一RRC重配置消息。
在一些实施例中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址,所述处理单元2205为所述第二F1-C连接增加 所述第四TNL地址。
在一些实施例中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息、用于第二F1-C连接的第四TNL地址以及用于所述第一F1-C连接的第二TNL地址,所述处理单元2205为所述第二F1-C连接增加所述第四TNL地址以及为所述第一F1-C增加所述第二TNL地址。
在一些实施例中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,在所述接收单元2201接收所述第一RRC重配置消息之前,所述接收单元2201接收所述第一Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息中包含用于所述第二F1-C连接的第三TNL地址;所述第一建立单元2201使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
在一些实施例中,所述接收单元2201接收所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,所述发送单元2204将所述第二RRC重配置消息发送给其服务的UE。
在上述实施例中,所述接收单元2201接收所述IAB节点服务的UE发送的第二RRC重配置完成消息,所述发送单元2204使用所述第三TNL地址或第所述四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
值得注意的是,以上仅对与本申请相关的各部件或模块进行了说明,但本申请不限于此。本申请实施例的资源分配装置2200还可以包括其它部件或者模块,关于这些部件或者模块的具体内容,可以参考相关技术。
此外,为了简单起见,图22中仅示例性示出了各个部件或模块之间的连接关系或信号走向,但是本领域技术人员应该清楚的是,可以采用总线连接等各种相关技术。上述各个部件或模块可以通过例如处理器、存储器、发射机、接收机等硬件设施来实现;本申请实施并不对此进行限制。
根据本申请实施例,如前所述,一方面,能够实现Donor设备之间的负载均衡,另一方面,优化了原F1-C连接以及新F1-C连接的转发路径。
第四方面的实施例
本申请实施例提供一种群组迁移装置。该装置例如可以是IAB系统中的Donor设备,也可以是配置于该Donor设备中的某个或某些部件或者组件。该IAB系统包括Donor设备和IAB节点,IAB节点从第一Donor设备移动到第二Donor设备,本申请实施例从第一Donor设备的一侧进行说明。其中,本申请实施例的群组迁移装置的实施原理与第一方面的实施例中第一Donor设备的实施类似,内容相同之处不再重复说明。
图23是本申请实施例的群组迁移装置的一个示意图,如图23所示,本申请实施例的群组迁移装置2300包括:
接收单元2301,其接收所述第二Donor设备发送的所述迁移IAB节点的第一F1-C连接的第二TNL地址;
处理单元2302,其将所述迁移IAB节点的第一F1-C连接的第一TNL地址更新为所述第二TNL地址,或者为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备CU之间的F1连接,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
在本申请实施例中,所述迁移IAB节点从所述第一Donor设备移动到所述第二Donor设备是指以下情况之一:
情况一:所述迁移IAB节点在所述第一Donor设备下回传RLC链路发生无线链路失败时,重建立到第二Donor设备;
情况二:所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
情况三:上述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接。
在一些实施例中,所述接收单元2301接收所述第二Donor设备发送的所述迁移IAB节点的F1-U连接的第六TNL地址;
所述处理单元2302将所述迁移IAB节点的F1-U连接的第五TNL地址更新为所述第六TNL地址,或者为所述迁移IAB节点的F1-U连接增加所述第六TNL地址;
其中,所述第五TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,如图23所示,所述装置2300还包括:
发送单元2303,其使用所述第一TNL地址通过所述第一F1-C连接向所述迁移IAB节点发送第二消息,所述第二消息包含用于所述迁移IAB节点的F1-U连接的第六TNL地址和/或用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
在一些实施例中,所述接收单元2301接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;所述发送单元2303使用所述第二TNL地址将所述第二RRC重配置消息通过所述第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE。
在一些实施例中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下(情况二),处理单元2302将所述迁移IAB节点的第一F1-C连接的第一TNL地址更新为所述第二TNL地址之前,所述接收单元2301接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;所述发送单元2303使用所述第一TNL地址将所述第二RRC重配置消息通过所述第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE。
图24是本申请实施例的群组迁移装置的另一个示意图,如图24所示,本申请实施例的群组迁移装置2400包括:
发送单元2401,其向所述第二Donor设备发送用于所述迁移IAB节点建立第二F1-C连接的第三TNL地址;其中,所述第二F1-C连接为所述IAB节点的DU与所 述第二Donor设备的CU之间的F1连接,所述第三TNL地址为可路由至所述第一Donor设备的DU的TNL地址。
在一些实施例中,所述迁移IAB节点从所述第一Donor设备移动到所述第二Donor设备是指以下之一:
情况二:所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
情况三:所述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接。
在一些实施例中,如图24所示,所述装置2400还包括:
接收单元2402,其接收所述第二Donor发送的用于所述迁移IAB节点的第一F1-C连接的第二TNL地址;
处理单元2403,其为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址,
其中,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址,所述第一F1-C连接为所述IAB节点的DU与所述第一Donor设备的CU之间的F1连接。
在一些实施例中,所述接收单元2402接收所述第二Donor设备发送的所述迁移IAB节点的F1-U连接的第六TNL地址;所述处理单元2403将所述迁移IAB节点的F1-U连接的第五TNL地址更新为所述第六TNL地址或者为所述迁移IAB节点的F1-U连接增加所述第六TNL地址;其中,所述第五TNL地址为可路由至所述第二Donor设备的DU的TNL地址,所述第六TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,所述发送单元2401向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含所述第三TNL地址,以使所述迁移IAB节点与所述第二Donor设备的CU建立第二F1-C连接。
在一些实施例中,所述接收单元2402接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;所述发送单元2401使用第一TNL地址或第二TNL地址将所述第二RRC重配置消息通过第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE;其中,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址, 所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
在一些实施例中,所述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接(情况三),所述发送单元2401使用第一TNL地址或使用所述第二TNL地址通过所述第一F1-C连接向所述迁移IAB节点发送第二消息,所述第二消息至少包含以下至少一项:用于F1-U的第六TNL地址;用于F1-U的BAP路由标识和回传RLC信道标识。
值得注意的是,以上仅对与本申请相关的各部件或模块进行了说明,但本申请不限于此。本申请实施例的资源分配装置2300/2400还可以包括其它部件或者模块,关于这些部件或者模块的具体内容,可以参考相关技术。
此外,为了简单起见,图23和图24中仅示例性示出了各个部件或模块之间的连接关系或信号走向,但是本领域技术人员应该清楚的是,可以采用总线连接等各种相关技术。上述各个部件或模块可以通过例如处理器、存储器、发射机、接收机等硬件设施来实现;本申请实施并不对此进行限制。
根据本申请实施例,如前所述,一方面,能够实现Donor设备之间的负载均衡,另一方面,优化了原F1-C连接以及新F1-C连接的转发路径。
第五方面的实施例
本申请实施例提供了一种通信系统,图25是该通信系统2500的示意图,如图25所示,该通信系统2500包括Donor设备2501和2502、IAB节点2503和2504,以及终端设备2505,其中,IAB节点2503为迁移IAB节点,Donor设备2501作为IAB节点2503的源Donor设备(第一Donor设备),Donor设备2502作为IAB节点2503的目标Donor设备(第二Donor设备),IAB节点2504和终端设备2505由IAB节点2503提供服务。
为简单起见,图25仅以两个Donro设备、两个IAB节点、一个终端设备为例进行说明,但本申请实施例不限于此。关于Donro设备、IAB节点以及该终端设备的网络架构可以参考相关技术,此处省略说明。
在一些实施例中,Donor设备2501被配置为执行第一方面的实施例中第一Donor设备所执行的方法,可以包含图23或图24的装置。在一些实施例中,Donor设备2502 被配置为执行第一方面的实施例中第二Donor设备所执行的方法,可以包含图21的装置。在一些实施例中,IAB节点2503被配置为执行第一方面的实施中迁移IAB节点所执行的方法,可以包括图22的装置。关于Donor设备2501和2502、IAB节点2503的相关内容请参见第一方面至第四方面的实施例,此处省略说明。
本申请实施例还提供一种IAB节点。
图26是本申请实施例的IAB节点的示意图。如图26所示,该IAB节点2600可以包括处理器2601和存储器2602;存储器2602存储有数据和程序,并耦合到处理器2601。值得注意的是,该图是示例性的;还可以使用其它类型的结构,来补充或代替该结构,以实现电信功能或其它功能。
例如,处理器2601可以被配置为执行程序而实现如第一方面的实施例中迁移IAB节点所执行的方法。
如图26所示,该IAB节点2600还可以包括:通信模块2603、输入单元2604、显示器2605、电源2606。其中,上述部件的功能与现有技术类似,此处不再赘述。值得注意的是,IAB节点2600也并不是必须要包括图26中所示的所有部件,上述部件并不是必需的;此外,IAB节点2600还可以包括图26中没有示出的部件,可以参考现有技术。
本申请实施例还提供一种Donor设备。
图27是本申请实施例的Donor设备的示意图。如图27所示,Donor设备2700可以包括:处理器(例如中央处理器CPU)2701和存储器2702;存储器2702耦合到处理器2701。其中该存储器2702可存储各种数据;此外还存储信息处理的程序,并且在中央处理器2701的控制下执行该程序。
例如,处理器2701可以被配置为执行程序而实现如第一方面的实施例中第一Donor设备或第二Donor设备所执行的方法。
此外,如图27所示,Donor设备2700还可以包括:收发机2703和天线2704等;其中,上述部件的功能与现有技术类似,此处不再赘述。值得注意的是,Donor设备2700也并不是必须要包括图27中所示的所有部件;此外,Donor设备2700还可以包括图27中没有示出的部件,可以参考现有技术。
本申请实施例还提供一种计算机可读程序,其中当在IAB节点中执行所述程序时,所述程序使得计算机在所述IAB节点中执行第一方面的实施例中迁移IAB节点 所执行的方法。
本申请实施例还提供一种存储有计算机可读程序的存储介质,其中所述计算机可读程序使得计算机在IAB节点中执行第一方面的实施例中迁移IAB节点所执行的方法。
本申请实施例还提供一种计算机可读程序,其中当在Donor设备中执行所述程序时,所述程序使得计算机在所述Donor设备中执行第一方面的实施例中第一Donor设备或第二Donor设备所执行的方法。
本申请实施例还提供一种存储有计算机可读程序的存储介质,其中所述计算机可读程序使得计算机在Donor设备中执行第一方面的实施例中第一Donor设备或第二Donor设备所执行的方法。
本申请以上的装置和方法可以由硬件实现,也可以由硬件结合软件实现。本申请涉及这样的计算机可读程序,当该程序被逻辑部件所执行时,能够使该逻辑部件实现上文所述的装置或构成部件,或使该逻辑部件实现上文所述的各种方法或步骤。逻辑部件例如现场可编程逻辑部件、微处理器、计算机中使用的处理器等。本申请还涉及用于存储以上程序的存储介质,如硬盘、磁盘、光盘、DVD、flash存储器等。
结合本申请实施例描述的方法/装置可直接体现为硬件、由处理器执行的软件模块或二者组合。例如,图中所示的功能框图中的一个或多个和/或功能框图的一个或多个组合,既可以对应于计算机程序流程的各个软件模块,亦可以对应于各个硬件模块。这些软件模块,可以分别对应于图中所示的各个步骤。这些硬件模块例如可利用现场可编程门阵列(FPGA)将这些软件模块固化而实现。
软件模块可以位于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动磁盘、CD-ROM或者本领域已知的任何其它形式的存储介质。可以将一种存储介质耦接至处理器,从而使处理器能够从该存储介质读取信息,且可向该存储介质写入信息;或者该存储介质可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。该软件模块可以存储在移动终端的存储器中,也可以存储在可插入移动终端的存储卡中。例如,若设备(如移动终端)采用的是较大容量的MEGA-SIM卡或者大容量的闪存装置,则该软件模块可存储在该MEGA-SIM卡或者大容量的闪存装置中。
针对附图中描述的功能方框中的一个或多个和/或功能方框的一个或多个组合, 可以实现为用于执行本申请所描述功能的通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或者其任意适当组合。针对附图描述的功能方框中的一个或多个和/或功能方框的一个或多个组合,还可以实现为计算设备的组合,例如,DSP和微处理器的组合、多个微处理器、与DSP通信结合的一个或多个微处理器或者任何其它这种配置。
以上结合具体的实施方式对本申请进行了描述,但本领域技术人员应该清楚,这些描述都是示例性的,并不是对本申请保护范围的限制。本领域技术人员可以根据本申请的精神和原理对本申请做出各种变型和修改,这些变型和修改也在本申请的范围内。
关于本实施例公开的上述实施方式,还公开了如下的附记:
1.一种群组迁移方法,其中,所述方法包括:
在迁移IAB节点从第一Donor和移动到第二Donor设备时,所述第二Donor设备进行以下处理的至少一种:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;
使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;
为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
2.根据附记1所述的方法,其中,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,是指以下情况之一:
所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
3.根据附记2所述的方法,其中,在所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,所述第二Donor设备进行以下处理:
使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;以及
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址。
4.根据附记3所述方法,其中,所述方法包括:
所述迁移IAB节点重建立到所述第二Donor设备之后,所述第二Donor设备向所述迁移IAB节点发送第一RRC重配置消息,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于所述第二F1-C连接的第四TNL地址。
5.根据附记4所述的方法,其中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于F1-U的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
6.根据附记4所述的方法,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述第二Donor设备向所述迁移IAB节点发送第一RRC重配置消息之后,所述方法还包括:
所述第二Donor设备向所述IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
6a.根据附记4或6所述的方法,其中,所述第二Donor设备与所述迁移IAB 节点建立所述第二F1-C连接后,所述方法还包括:
所述第二Donor设备的CU使用所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
7.根据附记6所述的方法,其中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
7a.根据附记7所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
7b.根据附记4或6所述的方法,其中,所述方法还包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点服务的UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;
所述第二Donor设备接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
8.根据附记2所述的方法,其中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述第二Donor设备进行以下处理:
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;或者,
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址,并且,使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址。
9.根据附记2所述的方法,其中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述第二Donor设备进行以下处理:
使所述迁移IAB节点将用于第二F1-C连接的第三TNL地址更新至所述第四TNL地址。
10.根据附记8所述的方法,其中,所述方法包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,或者,所述第一RRC重配置消息包含切换命令和用于所述第一F1-C连 接的第二TNL地址。
11.根据附记10所述的方法,其中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
12.根据附记10所述的方法,其中,若所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点切换至所述第二Donor之后,所述方法还包括:
所述第二Donor设备向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
12a.根据附记10或12所述的方法,其中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述方法还包括:
所述第二Donor设备的CU使用所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
13.根据附记12所述的方法,其中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
13a.根据附记13所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
14.根据附记10所述的方法,其中,所述方法还包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点服务的UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第二TNL地址或使 用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;
所述第二Donor设备接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
15.根据附记9所述的方法,其中,所述方法包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息,所述第一RRC重配置消息包括切换命令和所述用于第二F1-C连接的第四TNL地址。
16.根据附记15所述的方法,其中,所述第一RRC重配置消息还包含以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
16a.根据附记15所述的方法,其中,在所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息之前,所述方法还包括:
所述第二Donor设备的CU使用所述第三TNL地址通过所述第二F1-C连接向所述迁移IAB节点DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
16b.根据附记16a所述的方法,其中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
16c.根据附记16b所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
16d.根据附记15所述的方法,其中,所述方法还包括:
所述第二Donor设备向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发给所述迁移IAB节点;
所述第二Donor设备接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
17.根据附记2所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述第二Donor设备进行以下处理:
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
18.根据附记2所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述第二Donor设备进行以下处理:
为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址或第三TNL地址;或者,
为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
19.根据附记2所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述第二Donor设备进行以下处理:
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;或者,
为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址,以及为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址。
20.根据附记17所述的方法,其中,所述方法包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于所述第一F1-C连接的第二TNL地址。
21.根据附记20所述的方法,其中,所述第一RRC重配置消息还包括以下至少 一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
22.根据附记18所述的方法,其中,所述方法包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息;所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息以及用于所述第一F1-C连接的第二TNL地址。
23.根据附记22所述的方法,所述第一RRC重配置消息还包括以下至少一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
24.根据附记22所述的方法,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点增加与所述第二Donor设备的空口连接之后,所述方法还包括:
所述第二Donor设备向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址。
24a.根据附记22或24所述的方法,其中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述方法还包括:
所述第二Donor设备的CU使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文。
25.根据附记24a所述的方法,其中,所述第一消息包含所述UE的第一上下文 标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
25a.根据附记25所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
26.根据附记22或24所述的方法,所述方法还包括:
所述第二Donor设备向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址或所述第二TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发给所述迁移IAB节点;
所述第二Donor设备接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用所述第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
27.根据附记19所述的方法,其中,所述方法包括:
所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息,以便所述第一Donor设备向所述迁移IAB节点转发所述第一RRC重配置消息,所述第一RRC重配置消息包括辅小区组(SCG)配置信息和用于所述第二F1-C连接的第四TNL地址,或者,所述第一RRC重配置消息包括辅小区组(SCG)配置信息、用于所述第二F1-C连接的第四TNL地址和用于所述第一F1-C连接的第二TNL地址。
28.根据附记27所述的方法,其中,所述第一RRC重配置消息还包括以下至少一项:
分配给所述迁移IAB节点的BAP地址;
针对所述迁移IAB节点的辅小区组的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
29.根据附记27所述的方法,其中,在所述第二Donor设备向所述第一Donor设备发送针对所述迁移IAB节点的第一RRC重配置消息之前,所述方法还包括:
所述第二Donor设备的CU使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点 为其服务的UE建立第二上下文。
29a.根据附记29所述的方法,其中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
30.根据附记29a所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
31.根据附记27所述的方法,其中,所述方法还包括:
所述第二Donor设备向所述第一Donor设备发送针对所述UE的第二RRC重配置消息,以便所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接将所述第二RRC重配置消息转发至所述迁移IAB节点;
所述第二Donor设备接收所述迁移IAB节点使用所述第三TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息;或者,接收所述迁移IAB节点使用第四TNL地址通过所述第二F1-C连接发送的第二RRC重配置完成消息。
32.一种群组迁移方法,所述方法应用于迁移IAB节点,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,其中,所述方法包括:
所述迁移IAB节点从所述第一Donor设备接收所述第二Donor设备发送的第一RRC重配置消息,所述第一RRC重配置消息包括以下至少一项:
用于第一F1-C的第二TNL地址,以将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址,或为所述第一F1-C连接增加所述第二TNL地址;
用于第二F1-C的第四TNL地址,以将所述第二F1-C连接的第三TNL地址更新至所述第四TNL地址,或使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接,或为所述第二F1-C连接增加所述第四TNL地址;
用于第二F1-C连接的第三TNL地址,以为所述第二F1-C连接增加所述第三TNL地址,或使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是 可路由至所述第二Donor设备的DU的TNL地址。
33.根据附记32所述的方法,其中,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,是指以下情况之一:
所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
34.根据附记33所述的方法,其中,所述迁移IAB节点重建立到所述第二Donor设备之后,所述迁移IAB节点接收所述第一RRC重配置消息;
所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址;
或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于第二F1-C连接的第四TNL地址,所述迁移IAB节点将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址并且使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
35.根据附记34所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于F1-U的BAP路由标识和回传RLC信道标识,
其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
36.根据附记34所述的方法,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,所述迁移IAB节点接收所述第一RRC重配置消息之后,所述方法还包括:
所述迁移IAB节点接收所述第二Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址;
所述迁移IAB节点使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
36a.根据附记34或36所述的方法,其中,所述方法还包括:
所述迁移IAB节点与所述第二Donor设备建立第二F1-C连接,并接收所述第二Donor设备的CU使用所述第四TNL地址通过所述第二F1-C连接发送的第一消息;
所述迁移IAB节点根据所述第一消息为其服务的UE建立第二上下文。
37.根据附记36所述的方法,其中,所述第一消息包含所述UE的第一上下文标识,所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
38.根据附记37所述的方法,其中,所述第一消息还包含所述UE的服务小区配置信息。
39.根据附记34或36所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE;
所述迁移IAB节点接收其服务的UE发送的第二RRC重配置完成消息,并使用所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
40.根据附记34或36所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接发送的第二消息,所述第二消息包含用于F1-U的第六TNL地址,或者包含用于F1-U的第六TNL地址以及用于F1-U的BAP路由标识和回传RLC信道标识;
所述迁移IAB节点将所述F1-U的第五TNL地址更新为所述第六TNL地址。
41.根据附记33所述的方法,其中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述迁移IAB节点接收所述第一RRC重配置消息;
所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,所述迁移IAB节点使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
或者,所述第一RRC重配置消息包含切换命令和用于第一F1-C连接的第二TNL地址,所述迁移IAB节点将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址。
42.根据附记41所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
43.根据附记41所述的方法,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C连接的第四TNL地址,当所述迁移IAB节点切换至所述第二Donor设备之后,所述方法还包括:
所述IAB节点接收所述第二Donor设备发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于第二F1-C连接的第四TNL地址;
所述迁移IAB节点使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
43a.根据附记41或43所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第二TNL地址或使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE;
所述迁移IAB节点接收其服务的UE发送的第二RRC重配置完成消息,并使用所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
44.根据附记41所述的方法,其中,若所述第一RRC重配置消息包含所述第二 TNL地址,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第二TNL地址通过所述第一F1-C连接发送的第二消息,所述第二消息包含用于F1-U的第六TNL地址,或者包含用于F1-U的第六TNL地址以及用于F1-U的BAP路由标识和回传RLC信道标识;
所述迁移IAB节点将所述F1-U的第五TNL地址更新为所述第六TNL地址。
45.根据附记33所述的方法,其中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述迁移IAB节点接收所述第一RRC重配置消息,所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址;
所述迁移IAB节点将所述第二F1-C连接的第三TNL地址更新为所述第四TNL地址。
46.根据附记45所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
用于所述迁移IAB节点将其F1-U连接的第五TNL地址更新至第六TNL地址的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
47.根据根据附记45所述的方法,其中,在所述迁移IAB节点接收所述第一RRC重配置消息之前,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于所述第二F1-C的第三TNL地址;
所述迁移IAB节点使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
47a.根据附记47所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE;
所述迁移IAB节点接收其服务的UE发送的第二RRC重配置完成消息,并使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
48.根据附记33所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述迁移IAB节点接收所述第一RRC重配置消息;
其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点为所述第一F1-C连接增加所述第二TNL地址。
49.根据附记48所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
50.根据附记33所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述迁移IAB节点接收所述第一RRC重配置消息;
其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,所述迁移IAB节点使用所述第四TNL地址或所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息以及用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点为所述第一F1-C增加所述第二TNL地址。
51.根据附记50所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
52.根据附记50所述的方法,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C的第四TNL地址,所述迁移IAB节点增加与所述第二Donor设备的空口连接之后,所述方法还包括:
所述迁移IAB节点接收所述第二Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于所述第二F1-C的第四TNL地址;
所述迁移IAB节点使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
52a.根据附记50或52所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第一TNL地址或所述第二TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE;
所述迁移IAB节点接收其服务的UE发送的第二RRC重配置完成消息,并使用所述第三TNL地址或第所述四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
53.根据附记33所述的方法,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述迁移IAB节点接收所述第一RRC重配置消息;
其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址,所述迁移IAB节点为所述第二F1-C连接增加所述第四TNL地址;
或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息、用于第二F1-C连接的第四TNL地址以及用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点为所述第二F1-C连接增加所述第四TNL地址以及为所述第一F1-C增加所述第二TNL地址。
54.根据附记53所述的方法,其中,所述第一RRC重配置消息还包括以下至少之一:
分配给所述迁移IAB节点的BAP地址;
所述迁移IAB节点的回传RLC信道配置;
用于所述第二F1-C连接的BAP路由标识和回传RLC信道标识;
为所述迁移IAB节点的F1-U连接增加的第六TNL地址;
用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识;
其中,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
55.根据附记53所述的方法,其中,在所述迁移IAB节点接收所述第一RRC重配置消息之前,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息中包含用于所述第二F1-C连接的第三TNL地址;
所述迁移IAB节点使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
56.根据附记53所述的方法,其中,所述方法还包括:
所述迁移IAB节点接收所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,并将所述第二RRC重配置消息发送给其服务的UE;
所述迁移IAB节点接收其服务的UE发送的第二RRC重配置完成消息,并使用所述第三TNL地址或第所述四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
57.一种群组迁移方法,所述方法应用于第一Donor设备,迁移IAB节点从所述第一Donor设备移动到第二Donor设备,其中,所述方法包括:
所述第一Donor设备接收所述第二Donor设备发送的所述迁移IAB节点的第一F1-C连接的第二TNL地址;
所述第一Donor设备将所述迁移IAB节点的第一F1-C连接的第一TNL地址更新为所述第二TNL地址,或者为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址;
其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备 CU之间的F1连接,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
57a.根据附记57所述的方法,其中,所述迁移IAB节点从所述第一Donor设备移动到所述第二Donor设备是指以下之一:
所述迁移IAB节点在所述第一Donor设备下回传RLC链路发生无线链路失败时,重建立到第二Donor设备;
所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备
上述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接。
58.根据附记57a所述的方法,其中,所述方法还包括:
所述第一Donor设备接收所述第二Donor设备发送的所述迁移IAB节点的F1-U连接的第六TNL地址;
所述第一Donor设备将所述迁移IAB节点的F1-U连接的第五TNL地址更新为所述第六TNL地址,或者为所述迁移IAB节点的F1-U连接增加所述第六TNL地址;
其中,所述第五TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
59.根据附记58所述的方法,其中,所述方法还包括:
所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接向所述迁移IAB节点发送第二消息,所述第二消息包含用于所述迁移IAB节点的F1-U连接的第六TNL地址和/或用于所述迁移IAB节点的F1-U连接的BAP路由标识和回传RLC信道标识。
60.根据附记57a所述的方法,其中,所述方法还包括:
所述第一Donor设备接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;
所述第一Donor设备使用所述第二TNL地址将所述第二RRC重配置消息通过所述第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE。
61.根据附记57a所述的方法,其中,在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,将所述迁移IAB节点的第一F1-C连接的 第一TNL地址更新为所述第二TNL地址之前,所述方法还包括:
所述第一Donor设备接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;
使用所述第一TNL地址将所述第二RRC重配置消息通过所述第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE。
62.一种群组迁移方法,所述方法应用于第一Donor设备,迁移IAB节点从所述第一Donor设备移动到第二Donor设备,其中,所述方法包括:
所述第一Donor设备向所述第二Donor设备发送用于所述迁移IAB节点建立第二F1-C连接的第三TNL地址;
其中,所述第二F1-C连接为所述IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第三TNL地址为可路由至所述第一Donor设备的DU的TNL地址。
63.根据附记62所述的方法,其中,所述迁移IAB节点从所述第一Donor设备移动到所述第二Donor设备是指以下之一:
所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
所述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接。
64.根据附记62所述的方法,其中,所述方法还包括:
所述第一Donor设备接收所述第二Donor发送的用于所述迁移IAB节点的第一F1-C连接的第二TNL地址,并为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址,
其中,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址,所述第一F1-C连接为所述IAB节点的DU与所述第一Donor设备的CU之间的F1连接。
65.根据附记64所述的方法,其中,所述方法还包括:
所述第一Donor设备接收所述第二Donor设备发送的所述迁移IAB节点的F1-U连接的第六TNL地址;
所述第一Donor设备将所述迁移IAB节点的F1-U连接的第五TNL地址更新为 所述第六TNL地址或者为所述迁移IAB节点的F1-U连接增加所述第六TNL地址;
其中,所述第五TNL地址为可路由至所述第二Donor设备的DU的TNL地址,所述第六TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
66.根据附记62所述的方法,其中,所述方法还包括:
所述第一Donor设备向所述迁移IAB节点发送第三RRC重配置消息,其中,所述第三RRC重配置消息包含所述第三TNL地址,以使所述迁移IAB节点与所述第二Donor设备的CU建立第二F1-C连接。
67.根据附记66所述的方法,其中,所述方法还包括:
所述第一Donor设备接收所述第二Donor设备发送的针对所述迁移IAB节点服务的UE的第二RRC重配置消息;
所述第一Donor设备使用第一TNL地址或第二TNL地址将所述第二RRC重配置消息通过第一F1-C连接发送给所述迁移IAB节点,以便所述迁移IAB节点将所述第二RRC重配置消息转发给其服务的UE;
其中,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
68.根据附记66所述的方法,其中,所述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接,所述方法还包括:
所述第一Donor设备使用第一TNL地址或使用所述第二TNL地址通过所述第一F1-C连接向所述迁移IAB节点发送第二消息,所述第二消息至少包含以下至少一项:
用于F1-U的第六TNL地址;
用于F1-U的BAP路由标识和回传RLC信道标识。
69.一种Donor设备,包括存储器和处理器,所述存储器存储有计算机程序,其中,所述处理器被配置为执行所述计算机程序而实现如附记1至31以及57~68任一项所述的方法。
70.一种IAB节点,包括存储器和处理器,所述存储器存储有计算机程序,其中,所述处理器被配置为执行所述计算机程序而实现如附记32至56任一项所述的方法。
71.一种通信系统,包括Donor设备、IAB节点以及终端设备,其中,所述Donor设备被配置为执行附记1至31以及57~68任一项所述的方法,所述IAB节点被配置为执行附记32至56任一项所述的方法。

Claims (20)

  1. 一种群组迁移装置,配置于第二Donor设备,其中,所述装置包括:
    处理单元,在迁移IAB节点从第一Donor和移动到第二Donor设备时,所述处理单元进行以下处理的至少一种:
    使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;
    使所述迁移IAB节点将第二F1-C连接的第三TNL地址更新至第四TNL地址;
    为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址;
    为所述迁移IAB节点增加用于第一F1-C连接的第二TNL地址;
    为所述迁移IAB节点配置用于建立第二F1-C连接的第三TNL地址;
    为所述迁移IAB节点增加用于第二F1-C连接的第四TNL地址;
    其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
  2. 根据权利要求1所述的装置,其中,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,是指以下情况之一:
    所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
    所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
    所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
  3. 根据权利要求2所述的装置,其中,在所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,所述处理单元进行以下处理:
    使所述迁移IAB节点将第一F1-C连接的第一TNL地址更新至第二TNL地址;以及
    为所述迁移IAB节点配置用于建立第二F1-C连接的第四TNL地址。
  4. 根据权利要求3所述装置,其中,
    所述迁移IAB节点重建立到所述第二Donor设备之后,所述处理单元向所述迁移IAB节点发送第一RRC重配置消息,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于所述第二F1-C连接的第四TNL地址。
  5. 根据权利要求4所述的装置,其中,所述第二Donor设备与所述迁移IAB节点建立所述第二F1-C连接后,所述处理单元在所述第二Donor设备的CU的一侧使用所述第四TNL地址通过所述第二F1-C连接向所述迁移IAB节点的DU发送第一消息,以便所述迁移IAB节点为其服务的UE建立第二上下文,
    其中,所述第一消息包含所述UE的第一上下文标识,以便所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
  6. 一种群组迁移装置,所述装置配置于迁移IAB节点,所述迁移IAB节点从第一Donor设备移动到第二Donor设备,其中,所述装置包括:
    接收单元,其从所述第一Donor设备接收所述第二Donor设备发送的第一RRC重配置消息,所述第一RRC重配置消息包括以下至少一项:
    用于第一F1-C的第二TNL地址,以将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址,或为所述第一F1-C连接增加所述第二TNL地址;
    用于第二F1-C的第四TNL地址,以将所述第二F1-C连接的第三TNL地址更新至所述第四TNL地址,或使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接,或为所述第二F1-C连接增加所述第四TNL地址;
    用于第二F1-C连接的第三TNL地址,以为所述第二F1-C连接增加所述第三TNL地址,或使用所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
    其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备的CU之间的F1连接,所述第二F1-C连接为所述迁移IAB节点的DU与所述第二Donor设备的CU之间的F1连接,所述第一TNL地址和所述第三TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址和所述第四TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
  7. 根据权利要求6所述的装置,其中,所述迁移IAB节点从第一Donor设备移 动到第二Donor设备,是指以下情况之一:
    所述迁移IAB节点在所述第一Donor设备下的回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
    所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备;
    所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接。
  8. 根据权利要求7所述的装置,其中,所述装置还包括处理单元,
    所述迁移IAB节点重建立到所述第二Donor设备之后,所述接收单元接收所述第一RRC重配置消息;
    所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址,所述处理单元将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址;
    或者,所述第一RRC重配置消息包含用于所述第一F1-C连接的第二TNL地址以及用于第二F1-C连接的第四TNL地址,所述处理单元将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址并且使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
  9. 根据权利要求8所述的装置,其中,所述第一RRC重配置消息还包括以下至少之一:
    分配给所述迁移IAB节点的BAP地址;
    所述迁移IAB节点的回传RLC信道配置,以及用于F1-C和非F1数据的默认BAP路由标识和默认回传RLC信道标识;
    用于所述迁移IAB节点将其F1-U的第五TNL地址更新至第六TNL地址的第六TNL地址;
    用于F1-U的BAP路由标识和回传RLC信道标识,
    其中,所述第五TNL地址是可路由至所述第一Donor设备的DU的TNL地址,所述第六TNL地址是可路由至所述第二Donor设备的DU的TNL地址。
  10. 根据权利要求8所述的装置,其中,所述装置还包括:第一建立单元和第二建立单元,
    所述第一建立单元与所述第二Donor设备建立第二F1-C连接,所述接收单元接收所述第二Donor设备的CU使用所述第四TNL地址通过所述第二F1-C连接发送的 第一消息;所述第二建立单元根据所述第一消息为其服务的UE建立第二上下文;
    其中,所述第一消息包含所述UE的第一上下文标识,所述迁移IAB节点根据所述第一上下文标识获取所述UE的第一上下文并重用所述第一上下文建立所述第二上下文。
  11. 根据权利要求8所述的装置,其中,所述装置还包括:第一建立单元和处理单元,
    在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述接收单元接收所述第一RRC重配置消息;
    所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址,所述第一建立单元使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
    或者,所述第一RRC重配置消息包含切换命令和用于第一F1-C连接的第二TNL地址,所述处理单元将所述第一F1-C连接的第一TNL地址更新至所述第二TNL地址。
  12. 根据权利要求11所述的装置,其中,所述装置还包括发送单元,
    所述接收单元接收所述第一Donor设备使用所述第二TNL地址或使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB服务的UE的第二RRC重配置消息,所述发送单元将所述第二RRC重配置消息发送给其服务的UE;
    所述接收单元接收其服务的UE发送的第二RRC重配置完成消息,所述发送单元使用所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
  13. 根据权利要求8所述的装置,其中,所述装置还包括处理单元,
    在所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备的情况下,所述接收单元接收所述第一RRC重配置消息,所述第一RRC重配置消息包含切换命令和用于第二F1-C连接的第四TNL地址;所述处理单元将所述第二F1-C连接的第三TNL地址更新为所述第四TNL地址。
  14. 根据权利要求11所述的装置,其中,所述装置还包括发送单元,
    所述接收单元接收所述第一Donor设备使用所述第一TNL地址通过所述第一F1-C连接转发的针对所述迁移IAB节点服务的UE的第二RRC重配置消息,所述发 送单元将所述第二RRC重配置消息发送给其服务的UE;
    所述接收单元接收所述迁移IAB节点服务的UE发送的第二RRC重配置完成消息,所述发送单元使用所述第三TNL地址或所述第四TNL地址通过所述第二F1-C连接将所述第二RRC重配置完成消息发送给所述第二Donor设备。
  15. 根据权利要求8所述的装置,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元接收所述第一RRC重配置消息;
    其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于所述第一F1-C连接的第二TNL地址,所述迁移IAB节点为所述第一F1-C连接增加所述第二TNL地址。
  16. 根据权利要求8所述的装置,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元接收所述第一RRC重配置消息;
    其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址或第三TNL地址,所述装置还包括第一建立单元,所述第一建立单元使用所述第四TNL地址或所述第三TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接;
    或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息以及用于所述第一F1-C连接的第二TNL地址,所述装置还包括处理单元,所述处理单元为所述第一F1-C增加所述第二TNL地址。
  17. 根据权利要求16所述的装置,其中,如果所述第一RRC重配置消息中不包含所述用于第二F1-C的第四TNL地址,所述处理单元增加与所述第二Donor设备的空口连接之后,
    所述接收单元接收所述第二Donor设备发送的第三RRC重配置消息,其中,所述第三RRC重配置消息包含用于所述第二F1-C的第四TNL地址;
    所述第一建立单元使用所述第四TNL地址与所述第二Donor设备的CU建立所述第二F1-C连接。
  18. 根据权利要求8所述的装置,其中,在所述迁移IAB节点保持与所述第一Donor设备的连接并增加与所述第二Donor设备的空口连接的情况下,所述接收单元 接收所述第一RRC重配置消息;
    其中,所述第一RRC重配置消息包含辅小区组(SCG)配置信息和用于第二F1-C连接的第四TNL地址,所述装置还包括处理单元,所述处理单元为所述第二F1-C连接增加所述第四TNL地址;
    或者,所述第一RRC重配置消息包含辅小区组(SCG)配置信息、用于第二F1-C连接的第四TNL地址以及用于所述第一F1-C连接的第二TNL地址,所述装置还包括处理单元,所述处理单元为所述第二F1-C连接增加所述第四TNL地址以及为所述第一F1-C增加所述第二TNL地址。
  19. 一种群组迁移装置,配置于第一Donor设备,迁移IAB节点从所述第一Donor设备移动到第二Donor设备,其中,所述装置包括:
    接收单元,其接收所述第二Donor设备发送的所述迁移IAB节点的第一F1-C连接的第二TNL地址;
    处理单元,其将所述迁移IAB节点的第一F1-C连接的第一TNL地址更新为所述第二TNL地址,或者为所述迁移IAB节点的第一F1-C连接增加所述第二TNL地址;
    其中,所述第一F1-C连接为所述迁移IAB节点的DU与所述第一Donor设备CU之间的F1连接,所述第一TNL地址为可路由至所述第一Donor设备的DU的TNL地址,所述第二TNL地址为可路由至所述第二Donor设备的DU的TNL地址。
  20. 根据权利要求19所述的装置,其中,所述迁移IAB节点从所述第一Donor设备移动到所述第二Donor设备是指以下之一:
    所述迁移IAB节点在所述第一Donor设备下回传RLC链路发生无线链路失败时,重建立到所述第二Donor设备;
    所述迁移IAB节点从所述第一Donor设备切换到所述第二Donor设备
    上述迁移IAB节点保持与所述第一Donor设备的连接并增加与第二Donor设备的空口连接。
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