WO2022028541A1 - Procédé et appareil de commutation, et dispositif associé - Google Patents

Procédé et appareil de commutation, et dispositif associé Download PDF

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Publication number
WO2022028541A1
WO2022028541A1 PCT/CN2021/110910 CN2021110910W WO2022028541A1 WO 2022028541 A1 WO2022028541 A1 WO 2022028541A1 CN 2021110910 W CN2021110910 W CN 2021110910W WO 2022028541 A1 WO2022028541 A1 WO 2022028541A1
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Prior art keywords
handover
handover command
iab node
iab
node
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PCT/CN2021/110910
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English (en)
Chinese (zh)
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刘进华
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维沃移动通信有限公司
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Publication of WO2022028541A1 publication Critical patent/WO2022028541A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present application belongs to the field of communication technologies, and in particular, relates to a handover method, apparatus and related equipment.
  • an IAB loop may include multiple IAB nodes, and these IAB nodes provide services for different terminals respectively.
  • the purpose of the embodiments of the present application is to provide a handover method, apparatus, and related equipment, which can solve the problem in the related art that the IAB network cannot implement joint handover.
  • a first aspect provides a handover method for a source CU network in an IAB system, the handover method comprising:
  • the IAB network to be handed over includes an IAB node and a terminal, and the set of handover commands corresponds to the IAB node and the terminal in the IAB network to be handed over .
  • a second aspect provides a handover method for a first IAB node in an IAB network to be handed over, the handover method comprising:
  • a first instruction message is sent to instruct the second IAB node to execute the second handover command associated with the first handover command, and the second IAB node is the first IAB node's downstream node.
  • a third aspect provides a handover method for a second IAB node in an IAB network to be handed over, the handover method comprising:
  • the first IAB node is an upstream node of the second IAB node, and the first IAB node corresponds to the first handover command;
  • a second handover command corresponding to the second IAB node and associated with the first handover command is executed.
  • a host IAB node including:
  • the sending module is configured to send an associated set of switching commands to the command receiving node in the IAB network to be switched, the IAB network to be switched includes an IAB node and a terminal, and the set of switching commands is related to the IAB network to be switched.
  • IAB nodes correspond to terminals.
  • a first IAB node including:
  • a receiving module configured to receive the first handover command sent by the upstream node of the first IAB node or the source CU network
  • a sending module configured to send a first instruction message in the case of executing the first handover command, instructing the second IAB node to execute the second handover command associated with the first handover command, and the second IAB node is the Downstream node of the first IAB node.
  • a second IAB node including:
  • a receiving module configured to receive a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and the first IAB node corresponds to a first handover command;
  • An execution module configured to execute a second handover command corresponding to the second IAB node and associated with the first handover command.
  • a network-side device including: a memory, a processor, and a program or instruction stored on the memory and executable on the processor, where the program or instruction is executed by the processor
  • a network-side device including: a memory, a processor, and a program or instruction stored on the memory and executable on the processor, where the program or instruction is executed by the processor
  • a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the implementation of the first aspect or the second aspect or the third aspect is realized steps of the method.
  • a chip in a ninth aspect, includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a network-side device program or instruction to implement the first aspect or The method of the second aspect or the third aspect.
  • the source CU network sends an associated set of handover commands to a command receiving node in the IAB network to be handed over
  • the IAB network to be handed over includes an IAB node and a terminal
  • the set of handover commands is related to the IAB to be handed over IAB nodes in the network correspond to terminals.
  • the target IAB node triggers the handover process of the target IAB node when it meets the conditions of its conditional handover command, and its downstream node needs to perform associated handover with the target IAB node.
  • the source CU network can associate the handover command of the target IAB node with the handover command of the downstream node that needs to perform an associated handover with the target IAB node, and send an associated set of handover commands to the commands in the IAB network.
  • the receiving node during the handover process of the target IAB node, its downstream nodes can obtain respective corresponding handover commands, thereby triggering the handover process of each downstream node, thereby realizing the associated handover.
  • FIG. 1 is a structural diagram of a network system to which an embodiment of the present application can be applied;
  • FIG. 2 is a structural diagram of a CU-DU of an IAB system to which an embodiment of the present application can be applied;
  • FIG. 4 is a schematic diagram of switching a network to be switched from a source CU network to a target CU network in an embodiment of the present application
  • FIG. 5 is a flowchart of a conditional switching applicable to the embodiment of the present application.
  • 6a is one of the handover command distribution flowcharts of a handover method provided by an embodiment of the present application.
  • 6b is one of the handover command triggering flowcharts of a handover method provided by an embodiment of the present application.
  • 7a is the second handover command distribution flowchart of a handover method provided by an embodiment of the present application.
  • 7b is the second handover command triggering flowchart of a handover method provided by an embodiment of the present application.
  • 8a is the third handover command distribution flowchart of a handover method provided by an embodiment of the present application.
  • FIG. 8b is the third flowchart of a handover command triggering of a handover method provided by an embodiment of the present application.
  • FIG. 9 is the second flowchart of a handover method provided by an embodiment of the present application.
  • FIG. 10 is the third flowchart of a handover method provided by an embodiment of the present application.
  • FIG. 11 is a structural diagram of a host IAB node provided by an embodiment of the present application.
  • FIG. 12 is a structural diagram of a first IAB node provided by an embodiment of the present application.
  • FIG. 13 is a structural diagram of a second IAB node provided by an embodiment of the present application.
  • FIG. 15 is a second structural diagram of a network side device provided by an embodiment of the present application.
  • first, second and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and "first”, “second” distinguishes Usually it is a class, and the number of objects is not limited.
  • the first object may be one or multiple.
  • “and/or” in the description and claims indicates at least one of the connected objects, and the character “/" generally indicates that the associated objects are in an "or” relationship.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced
  • LTE-A Long Term Evolution
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency-Division Multiple Access
  • system and “network” in the embodiments of the present application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies.
  • NR New Radio
  • NR terminology is used in most of the following description, although these techniques are also applicable to applications other than NR system applications, such as 6th generation ( 6th Generation, 6G) communication system.
  • FIG. 1 shows a block diagram of a wireless communication system to which the embodiments of the present application can be applied.
  • the wireless communication system includes a terminal 11 and network side devices (12, 13 and 14).
  • the terminal 11 may also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital computer Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted device (VUE), pedestrian terminal (PUE) and other terminal-side devices, wearable devices include: bracelets, headphones, glasses, etc.
  • PDA Personal Digital Assistant
  • the network-side devices (12, 13, and 14) may be base stations or core networks, where the base stations may be referred to as Node Bs, evolved Node Bs, access points, Base Transceiver Stations (BTS), radio base stations, Radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN Access Point, WiFi node, Transmitting Receiving Point (TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary, it should be noted that in this In the application embodiments, only the base station in the NR system is used as an example, but the specific type of the base station is not limited.
  • the number of terminals 11 and network side devices may be multiple to form an IAB network.
  • the IAB system may include: a host IAB node 12 (that is, a donor IAB node), an intermediate IAB node 13 and an access IAB node 14, and each IAB node can provide services for different terminals.
  • the intermediate IAB node 13 and the access IAB node 14 in the IAB system both include a distributed unit (Distributed Unit, DU) functional part and a mobile terminal (Mobile Termination, MT) functional part, and the host IAB node 12 Only includes the DU functional part.
  • DU distributed Unit
  • MT Mobile Termination
  • the downstream IAB node can rely on the MT to find an upstream IAB node (parent IAB node), and establish a wireless connection with the DU of the upstream IAB node, which is called a backhaul link.
  • a backhaul link After an IAB node establishes a complete backhaul link, the IAB node opens its DU function, and the DU provides cell services, that is, the DU can provide access services for the terminal 11.
  • the host IAB node 12 has a directly connected wired transmission network.
  • the DUs of all IAB nodes are connected to a CU network, which configures the DUs through the F1-AP protocol.
  • the CU can also configure the MT through the RRC protocol.
  • FIG. 3 is a flowchart of a handover method provided by an embodiment of the present application. The method is used for a source CU network in an IAB system, as shown in FIG. 3, including the following steps:
  • Step 301 Send an associated group of handover commands to a command receiving node in the IAB network to be handed over, the IAB network to be handed over includes an IAB node and a terminal, and the group of handover commands is associated with the IAB node in the IAB network to be handed over. corresponds to the terminal.
  • the above-mentioned group of associated handover commands can be understood as: a plurality of handover commands in the group of handover commands are correlated with each other, and execution of one handover command in a group of interrelated handover commands can trigger execution of other handover commands.
  • the above-mentioned group of handover commands may include conditional handover commands and handover commands.
  • the IAB node When the IAB node receives the corresponding conditional handover command, it triggers the handover process when the conditions of the conditional handover command are met; the IAB node receives the corresponding handover command. , the switching process is directly triggered.
  • the handover command corresponding to the IAB node connected to the host IAB node (or the IAB node that does not have a parent node in the IAB network to be handed over) may be a conditional handover command, and the handover commands corresponding to other IAB nodes may be conditional handover commands, It can also be a switch command.
  • the target IAB node in the IAB network triggers the handover process of the target IAB node when it meets the conditions of its conditional handover command, and its downstream nodes (including the IAB node and the terminal) need to Associate handover with the target IAB node.
  • the source CU network can associate the handover command of the target IAB node with the handover command of the downstream node that needs to perform an associated handover with the target IAB node, and send an associated set of handover commands to the commands in the IAB network.
  • the receiving node during the handover process of the target IAB node, its downstream nodes can obtain respective corresponding handover commands, thereby triggering the handover process of each downstream node, so as to realize the associated handover.
  • the above-mentioned source CU network may be the CU network to which the IAB network to be switched is connected before switching.
  • an IAB node in the to-be-switched IAB network triggers the switch from a CU network to the target CU network according to a preconfigured conditional switching command, part or all of the downstream IAB nodes in the IAB network where the IAB node is located ( At least one IAB node other than the IAB node) and the terminals served by the part or all of the downstream IAB nodes respectively execute the handover process according to the corresponding handover command, so as to switch to the target CU network.
  • IAB nodes or terminals in the IAB network to be switched can be switched to different CU networks, or some downstream IAB nodes and terminals served by them can be switched to other target DU nodes of the source CU network. , the difference lies in the switching command.
  • the following embodiments only take the overall switching of the IAB network to be switched to the target CU network as an example for illustration, which is not specifically limited herein.
  • the source CU network can associate the handover command of the target IAB node with the handover command of the downstream node that needs to be associated with the target IAB node, which can be: when a certain IAB node is handed over, the downstream IAB node
  • the handover command to be executed is defined as a conditional handover command, and the trigger condition of the downstream IAB node handover is that its upstream IAB node is handed over according to the corresponding handover command.
  • the downstream IAB node can follow its upstream IAB node to perform association switching.
  • the source CU network may associate the handover command of the target IAB node with the handover command of the downstream node that needs to perform an associated handover with the target IAB node, which may be: a set of interrelated handover commands is defined
  • the handover method further includes:
  • the handover command set includes the interrelated group of handover commands.
  • a corresponding handover command set can be determined, wherein the handover command set includes a plurality of handover commands to respectively The downstream IAB node corresponding to the IAB node to be switched and the terminal directly served by the IAB node to be switched and the downstream IAB node.
  • the downstream IAB node and the terminal receive the ID of the handover command set, they can determine their corresponding handover commands from the handover command set indicated by the ID, thereby triggering their respective handover processes and realizing the associated handover of the IAB network.
  • the source CU network may indicate the handover command set to which the handover command belongs.
  • the second indication information may be sent through an F1-AP message or an RRC message.
  • add handover command set indication in RRC Reconfiguration IE may be a character string or a serial number, etc.
  • the IAB network to be switched includes the IAB A node, the IAB B node, the UE A served by the IAB A node, and the UE B served by the IAB B node
  • the source CU network includes the CU A and the The DU connected to the CU A
  • the target CU network includes the CU B and the DU connected to the CU B.
  • configure the conditional switching command condHOCmd A for IAB A configure the switching command HOCmd B for IAB B, configure the switching command HOCmd C for UE A, and switch the UE B Command HOC md D.
  • condHOCmd A When the conditional switching command condHOCmd A of IAB A is triggered, IAB B, UE A and UE B need to execute HOCmd B, HOCmd C and HOCmd D respectively to realize the associated switching to the CUB network.
  • condHOCmd A, HOCmd B, HOCmd C and HOCmd D can be called a handover command set.
  • condHOCmd A can be a conditional switching command
  • HOCmd B, HOCmd C, and HOCmd D can be unconditional switching commands or conditional switching commands, which are not specifically limited here.
  • other nodes can determine and execute other handover commands associated with the handover command according to the handover command set to which the executed handover command belongs, so as to realize the association of the IAB network to be handed over switch.
  • the premise of performing the associated handover is to determine a handover command in the handover command set.
  • the handover command can be a conditional trigger command.
  • the above conditional handover command triggers The specific process can include the following processes:
  • Step 1 The Access and Mobility Management Function (Access and Mobility Management Function) entity provides mobility control information (Mobility control information) to the source base station.
  • mobility control information Mobility control information
  • Step 2 The UE (which may also be an IAB node) sends measurement control and reports (measurement control and reports).
  • Step 3 The source base station (source gNB) makes a control handover decision (Control Hand-Off Desision, CHO Desision).
  • the above-mentioned CHO Decision may include determining whether to initiate a conditional handover process for the UE and determining a target base station (target gNB) and a potential target base station (other potential target gNB(s)) that can provide services for the UE.
  • target gNB target base station
  • potential target gNB(s) other potential target gNB(s)
  • Step 4 The source base station sends a handover request (Hand Over Request) message to the potential target base station.
  • Step 5 The potential target base station performs admission control.
  • This step means that the potential target base station confirms whether it can provide services for the UE, and generates a handover command for the UE to be handed over under the condition that it can provide services for the UE.
  • Step 6 The potential target base station sends a handover request acknowledgement (handover request acknowledge) message of the UE to the source base station, which carries a handover command.
  • handover request acknowledge handover request acknowledge
  • Step 7 The source base station sends radio resource control (Radio Resource Control, RRC) reconfiguration (RRC reconfiguration) signaling to the UE.
  • RRC Radio Resource Control
  • the RRC reconfiguration message carries the handover command and handover condition of the UE.
  • Step 8 After receiving the RRC reconfiguration message, the UE returns an RRC reconfiguration complete message.
  • the above handover process may specifically include: after receiving the RRC reconfiguration signaling, the subject to be handed over (UE or IAB node) feeds back the RRC reconfiguration complete (RRC reconfiguration complete) to the source base station when the reconfiguration is completed according to the signaling )information.
  • Step 9 Determine whether the switching conditions are satisfied (evaluate the CHO conditions).
  • step 10 is executed.
  • Step 10 Separate from the original CU network (detach from the ole cell), and connect to the target CU network (synchronize to the new cell).
  • the source base station determines to initiate a conditional handover procedure for the UE and a potential target base station (target gNB) that can provide services for the UE, and initiates handover to the potential target base station request, the potential target base station confirms that it can provide services for the UE, then generates a handover command for the UE and sends it to the source base station.
  • the source base station After receiving the handover command from the potential target base station, the source base station sends the handover command together with the handover condition to the UE. After monitoring that the handover condition is satisfied, the UE switches to the potential target base station, otherwise the UE continues to be served by the source base station.
  • the switching commands of the terminal and the IAB node in the network to be switched all come from the source CU network.
  • all control commands are sent/distributed by the source CU network, and this distribution can be carried out in different ways.
  • the receiving nodes of the command are different, but when the IAB node that receives the command receives the above set of handover commands, it can trigger the IAB node downstream of it during the process of executing the handover command itself or after executing the handover command.
  • the handover process, and the handover process of the terminal that triggers its service are different, but when the IAB node that receives the command receives the above set of handover commands, it can trigger the IAB node downstream of it during the process of executing the handover command itself or after executing the handover command.
  • the upstream IAB node may send a first indication message to the downstream IAB node to instruct the downstream IAB node to perform the associated handover through the first indication message.
  • the above-mentioned first indication message may indicate the downstream IAB node and the handover command of the downstream IAB node.
  • the downstream IAB node triggers the handover process based on its own handover command, and sends the handover command of the terminal it serves to the corresponding terminal, so that each terminal triggers the handover process based on its own handover command, thereby realizing the associated handover.
  • the above-mentioned first indication message may indicate the handover command set ID to which the handover command executed by the upstream IAB node belongs.
  • the downstream IAB node can learn the corresponding handover command set according to the handover command set ID, and obtain the respective handover commands and the handover commands of the respective service terminals, so as to trigger the handover process according to the handover command of the IAB node itself, and use the handover commands it serves.
  • the handover command of the terminal is sent to the corresponding terminal, so that each terminal triggers the handover process based on its own handover command, thereby realizing the associated handover.
  • the command receiving node includes: an IAB node in the to-be-switched IAB network.
  • This method belongs to centralized distribution, and all switching commands are distributed to an IAB node in the IAB network to be switched, which can be the first IAB node directly connected to the source CU network (it can also be understood that there is no IAB node in the network to be switched).
  • IAB of the upstream IAB node such as IAB A in Figure 6a.
  • an IAB node in the to-be-switched IAB network receives the set of handover commands, and triggers the handover of the downstream IAB node (including the downstream IAB node itself in the process of executing the handover command or after executing the handover command). handover and handover of the UE it serves). Specifically, during the handover process of the IAB node, the handover command of the terminal served by the IAB node is sent to the corresponding terminal, and the handover command of the downstream IAB node and the handover command of the terminal served by the downstream IAB node are sent to the corresponding terminal. The handover command is sent to the downstream IAB node.
  • the IABB node is the downstream node of the IABB A node, and the IABB A node provides services for UE A, and the IABB B node provides services for UE B.
  • the source CU network configures the conditional handover command condHOCmd A of IAB A, the handover command HOCmd C of UE A, the handover command HOCmd B of IAB B, and the handover command HOCmd D of UE B to the same handover command Set 1, send these switching commands to IABA A, and IABA A stores these switching commands.
  • IAB A executes condHOCmd A for handover or after it is completed, it sends the handover commands HOCmd B and HOCmd D belonging to the same handover command set to the downstream IAB B, and sends HOCmd C to UE A, so that each downstream node will The respective handover command performs the handover.
  • IAB A sends the handover command HOCmd C of UE A to UE A, and sends the handover command HOCmd B of IAB B and the handover command HOCmd D of UE B to IAB B.
  • the instruction message directly carries the handover command.
  • IAB B receives HOCmd B and HOCmd D, it executes HOCmd B to trigger its own handover process, and during the handover process or after the handover is completed, it sends UE B's handover command HOCmd D to UE B, triggering UE B switch.
  • a downstream node (IAB node or UE) can perform handover after receiving its own handover command.
  • the CU sends all the handover commands of a handover command set (including the handover commands of the node itself and the handover commands of its downstream nodes) to an IAB node, which is configured with conditional handovers belonging to the handover command set command, so that the IAB node stores all the handover commands of the handover command set.
  • the IAB node determines that the handover is triggered according to its conditional handover command
  • the handover command of the handover command set is distributed to the downstream node (the IAB node or the UE).
  • the source CU network may indicate the handover command set corresponding to the handover command when sending the handover command to the IABA node.
  • IAB A can determine the corresponding handover command set according to the handover command set instruction, and send the handover command in the handover command set corresponding to UE A to UE A, and the handover command set in the handover command set corresponding to IAB B and UE B.
  • the command is sent to IAB B, and when IAB B receives the handover command corresponding to IAB B and UE B, it triggers its own handover process, and sends the handover command corresponding to UE B to UE B.
  • the command receiving node includes: an IAB node corresponding to the handover command, and an IAB node providing services for the terminal corresponding to the handover command.
  • This method belongs to distributed distribution, all handover commands are distributed to the corresponding IAB nodes in the IAB network to be handed over, and the handover commands of the UE served by each IAB node are also sent to the IAB.
  • the IAB node corresponding to the handover command and the IAB node serving the terminal corresponding to the handover command may respectively receive the group of handover commands, and obtain the corresponding handover commands from the group of handover commands, Alternatively, the IAB node corresponding to the handover command may receive the handover command corresponding to the IAB node in the group of handover commands, and the IAB node serving the terminal corresponding to the handover command may receive the handover command corresponding to the terminal command and handover command for this IAB node.
  • the IAB node corresponding to the handover command acquires the handover command, it can trigger the handover process of the IAB node, and in the process of executing the handover command itself or after executing the handover command, the IAB node serves the terminal.
  • the handover command is sent to the corresponding terminal to trigger the handover process of the terminal.
  • the IAB node when it has a downstream IAB node, it will send an instruction message to the downstream IAB node to trigger the handover of the downstream IAB node and the terminal it serves.
  • the source CU network may indicate the handover command set corresponding to the handover command when sending the handover command to the IAB node.
  • the instruction indicating the handover command set may be explicitly or implicitly carried in a notification message, and the notification message may be indicated by a BAP control PDU or a medium access control element (MAC CE).
  • MAC CE medium access control element
  • an IAB node when an IAB node triggers the handover according to the conditional handover command of the handover command set, it can determine the associated handover command set according to the handover command set instruction, and send the ID of the handover command set to the corresponding downstream node (IAB node) to The downstream node is notified to execute the corresponding handover command in the handover command set to perform handover.
  • the structure of the IAB network to be switched is the same as the structure of the IAB network to be switched as shown in Figure 6a and Figure 6b, which will not be repeated here.
  • the difference from the handover process shown in Figure 6a and Figure 6b is that the source CU network sends the conditional handover command condHOCmd A of the IABA A node and the handover command HOCmd C of the UE A to the IABA A, which is stored by the IAB A;
  • the CU network sends the conditional handover command HOCmd B of IAB B and the handover command HOCmd D of UE B to IAB B, which is stored by IAB B; and condHOCmd A, HOCmd B, HOCmd C and HOCmd D belong to the same handover command set 1, That is, the four switching commands are associated switching commands.
  • IAB A When IAB A triggers handover according to condHOCmd A, IAB A sends UE A's handover command HOCmd C to UE A, and sends a notification message to IAB B, informing IAB B to initiate handover according to handover command set 1; IAB B receives the handover command according to After the instruction of set 1 handover, the handover command HOCmd D is sent to each UE B, and the HOCmd B is executed to initiate its own handover.
  • the handover command for each UE in a handover command set can be sent by the source CU to the direct serving IAB node for storage, while the handover command for the IAB node is stored by the corresponding IAB node, and the conditional handover command in the IAB node
  • notification messages can be respectively sent to the downstream IAB nodes of the IAB node, so that each IAB node performs associated handover according to the corresponding handover command set.
  • the command receiving node includes: a parent IAB node of the IAB node corresponding to the handover command, and an IAB node providing services for the terminal corresponding to the handover command.
  • This method belongs to centralized distribution, and the handover command of the IAB node in the IAB network to be handed over will be distributed to its upstream node, and the UE will be distributed to the IAB node that provides services for it.
  • the handover of the downstream IAB node (including the handover of the downstream IAB node itself is triggered during the execution of the handover command by the parent IAB node or after the handover command is executed). and handover of the UE it serves).
  • the downstream node obtains the corresponding handover command from the parent IAB node, and receives the handover command of the terminal it serves from the source CU network, so that during the handover process of the IAB node, the terminal can switch from the IAB node that serves it to the terminal. Get the switch command.
  • the structure of the IAB network to be switched is the same as the structure of the IAB network to be switched as shown in Figures 6a and 6b, and details are not described here.
  • the difference from the handover process shown in Figure 6a and Figure 6b is that the source CU network sends the conditional handover command condHOCmd A of the IAB A node, the handover command HOCmd C of the UE A, and the conditional handover command HOCmd B of the IAB B to the IAB.
  • the source CU network sends the handover command HOCmd D of UE B to IAB B, which is stored by IAB B; and condHOCmd A, HOCmd B, HOCmd C and HOCmd D belong to the same handover command set 1, That is, the four switching commands are associated switching commands.
  • IAB A When IAB A triggers the handover according to condHOCmd A, IAB A sends UE A's handover command HOCmd C to UE A, sends IAB B's conditional handover command HOCmd B to IAB B, and sends a notification message to IAB B, informing the press
  • the handover command set 1 initiates the handover; after receiving the instructions of the HOCmd B and the handover command set 1, the IAB B sends the handover command HOCmd D to each UE B, and initiates its own handover according to the HOCmd B.
  • the handover command of an IAB node can be cached by its direct parent IAB node.
  • its parent IAB node determines to switch according to a certain handover command set, it sends the corresponding handover command together with the handover command set instruction to the IAB node.
  • IAB node after receiving the handover command, the IAB node sends the stored handover command to the UE and IAB node it serves according to the handover command set instruction.
  • the downstream IAB node can be notified to initiate switching according to the corresponding switching instruction set through a notification message.
  • FIG. 9 is a flowchart of a handover method provided by an embodiment of the present application.
  • the method is applied to the first IAB node in the IAB network to be handed over.
  • the The method may include the following steps:
  • Step 901 Receive a first handover command sent by the upstream node of the first IAB node or the source CU network.
  • Step 902 In the case of executing the first handover command, send a first instruction message to instruct the second IAB node to execute the second handover command associated with the first handover command, and the second IAB node is the first handover command.
  • the downstream node of the IAB node In the case of executing the first handover command, send a first instruction message to instruct the second IAB node to execute the second handover command associated with the first handover command, and the second IAB node is the first handover command.
  • the first IAB node represents an IAB node having a downstream IAB node in the to-be-switched IAB network
  • the second IAB node is a downstream node of the first IAB node, for example: the first IAB node
  • the IAB node is the IAB A node as shown in Figure 6a
  • the second IAB node is the IAB B node as shown in Figure 6a.
  • the first handover command is a handover command corresponding to the first IAB node, and the first IAB node triggers a handover process when receiving the first handover command.
  • the first switching command is: Conditional toggle command.
  • the above-mentioned first indication message may be used to indicate a second handover command associated with the first handover command.
  • the first indication message may carry indication information of a handover command set, and the handover command set includes the The first switching instruction and the second switching instruction.
  • the switching instructions of the downstream IAB nodes of the first IAB node are stored in the first IAB node, and when the first IAB node triggers switching, the corresponding second switching instructions are sent to each downstream IAB node, so that Each downstream IAB node follows the first IAB node to perform association switching.
  • the switching method provided by the embodiment of the present application further includes:
  • the third handover command is sent to the terminal served by the first IAB node.
  • the third handover command is a handover command corresponding to the terminal served by the first IAB node, and the handover process of the terminal is triggered when the terminal receives the corresponding third handover command.
  • the first IAB node is the IAB A node as shown in Figure 6a
  • the terminal served by the first IAB node is UE A as shown in Figure 6a.
  • the first IAB node receives the handover instruction of the terminal served by the first IAB node, and when the first IAB node triggers the handover, the corresponding third handover instruction is sent to each terminal, so that each terminal follows the first IAB node. Make an association switch.
  • the switching method provided in the embodiment of the present application further includes:
  • the first indication information carries the second handover command, or carries the second handover command and the fourth handover command.
  • the fourth switching instruction is a switching instruction corresponding to the terminal served by the second IAB node, for example: in the IAB system as shown in FIG. 6a, the first IAB node is IAB A, the second IAB node is IAB B, Then the terminal served by the second IAB node is UE B.
  • the first IAB node can send its handover instruction to the second IAB node through the first indication information, and can also send the handover instruction of the terminal served by the second IAB node to the second IAB node. In this way, when the first IAB node triggers the handover process, the second IAB node and the terminal served by the second IAB node can perform an associated handover.
  • the interrelated handover commands are defined as a handover command set
  • the first indication message indicates the handover command set to which the first handover command belongs
  • the second handover command includes at least one of the following handover commands: the handover command set to which the first handover command belongs, the handover command corresponding to the second IAB node, and the handover command set to which the first handover command belongs, the handover command set corresponding to the terminal served by the second IAB node switch command.
  • the handover command corresponding to the terminal served by the second IAB node has the same meaning as the fourth handover command in the previous embodiment.
  • the first IAB node can send a handover instruction and a command set instruction to the second IAB node.
  • IAB A can send the IAB B handover instruction to IAB B, and The handover command set indication is carried, so that the IABB can determine the handover command set according to the handover command set indication, and thereby determine the handover command of the UE B served by the IABB.
  • interrelated handover commands are defined as a handover command set, and the handover method further includes:
  • a second indication message is received, where the second indication message indicates the handover command set to which the received handover command belongs.
  • the meaning of the second indication message may be the same as that of the first indication message in the previous embodiment that can indicate the same handover command set.
  • the first IAB node can determine the handover command set to which the received handover command belongs according to the second indication message, so as to determine each handover command in the handover command set accordingly, and send each handover command To the downstream IAB node and terminal, or send the instruction of the handover command set to the downstream IAB node, so that the downstream IAB node obtains the corresponding handover command from the handover command set according to the instruction of the handover command set.
  • the first IAB node only needs to receive the second indication message to determine the corresponding handover command in the handover command set, so as to realize the associated handover of the IAB system and save network resources.
  • FIG. 10 is a flowchart of a handover method provided by an embodiment of the present application, which is used for a second IAB node in an IAB network to be handed over.
  • the handover method may include the following steps:
  • Step 1001 Receive a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and the first IAB node corresponds to a first handover command.
  • Step 1002 Execute a second handover command corresponding to the second IAB node and associated with the first handover command.
  • the first indication information may include a second handover command corresponding to the second IAB node, or include indication information of a second handover command corresponding to the second IAB node.
  • the first IAB node performs the handover process when acquiring the first handover command, and informs the second IAB node of the second handover command associated with the first handover command, so that the second IAB node can obtain the first handover command
  • the handover is performed accordingly, thereby realizing the association handover between the first IAB node and the second IAB node.
  • the switching method further includes:
  • the fourth handover command is sent to the terminal served by the second IAB node.
  • IAB A sends to IABB B the instruction information that carries the handover instruction of IAB B
  • IABB B also receives the handover instruction of UE B sent by the source CU network.
  • the above-mentioned fourth handover command has the same meaning as the fourth handover command in the method embodiment applied to the first IAB node provided by the present application, and will not be described in detail here.
  • the first indication message carries the second handover command, or carries the second handover command and a fourth handover command, and the fourth handover command serves with the second IAB node
  • the terminal corresponds to and is associated with the first handover command.
  • the difference from receiving the fourth handover instruction above is that, in this embodiment, the fourth handover instruction is carried by the first instruction message.
  • the IAB A sends the handover instruction of the IAB B and the handover instruction of the UE B to the IABB B.
  • the interrelated handover commands are defined as a handover command set
  • the first indication message indicates the handover command set to which the first handover command belongs
  • the second handover command includes at least one of the following handover commands: receiving Among the received handover commands sent by the source CU network, the handover commands belonging to the handover command set indicated by the first indication message and corresponding to the second IAB node, and the received handover commands sent by the source CU network In the command, the handover command belongs to the handover command set indicated by the first indication message and corresponds to the terminal served by the second IAB node.
  • the associated triggering of all handover commands in the handover command set can be realized.
  • the specific triggering process is the same as the process of triggering the association based on the command set in the method embodiment shown in FIG. 3 , and details are not repeated here.
  • interrelated handover commands are defined as a handover command set, and the handover method further includes:
  • a second indication message is received, where the second indication message indicates the handover command set to which the received handover command belongs.
  • the meaning of the second indication message may be the same as that of the first indication message in the previous embodiment that can indicate the same handover command set.
  • the second IAB node can determine the handover command set to which the received handover command belongs according to receiving the second indication message, so as to determine each handover command in the handover command set accordingly, and send each handover command To the downstream IAB node and terminal, or send the instruction of the handover command set to the downstream IAB node, so that the downstream IAB node obtains the corresponding handover command from the handover command set according to the instruction of the handover command set.
  • the second IAB node only needs to receive the second indication message to determine the corresponding handover command in the handover command set, so as to realize the associated handover of the IAB system and save network resources.
  • FIG. 11 is a structural diagram of a host IAB node provided by an embodiment of the present application.
  • the host IAB node 1100 may include a source CU network in the IAB network to be switched. As shown in FIG. 11, the host IAB node 1100 includes:
  • the first sending module 1101 is configured to send an associated group of handover commands to a command receiving node in the IAB network to be handed over, the IAB network to be handed over includes an IAB node and a terminal, and the group of handover commands is related to the IAB to be handed over.
  • IAB nodes in the network correspond to terminals.
  • the command receiving node includes: a downstream IAB node in the to-be-switched IAB network;
  • the command receiving node includes: an IAB node corresponding to the handover command, and an IAB node providing services for the user terminal corresponding to the handover command;
  • the command receiving node includes: a parent IAB node of the IAB node corresponding to the handover command, and an IAB node providing services for the terminal corresponding to the handover command.
  • the set of interrelated handover commands is defined as a handover command set
  • the host IAB node 1100 further includes:
  • the second sending module is configured to send second indication information to indicate the handover command set to which the handover command belongs.
  • the second indication information is sent through an F1-AP message or a radio resource control RRC message.
  • the host IAB node provided in the embodiment of the present application can implement each process of the method embodiment shown in FIG. 3 , and can achieve the same beneficial effect. To avoid repetition, details are not repeated here.
  • the execution subject may be the host IAB node shown in FIG. 11 , or a control module in the host IAB node for executing the handover method.
  • a method for performing a handover performed by a host IAB node is used as an example to describe the apparatus provided by the embodiments of the present application.
  • FIG. 12 is a structural diagram of a first IAB node provided by an embodiment of the present application.
  • the first IAB node 1200 may be an IAB node having a downstream IAB node in the IAB network to be switched, as shown in FIG. 12 .
  • the first IAB node 1200 includes:
  • a first receiving module 1201, configured to receive a first handover command sent by the upstream node of the first IAB node or the source centralized unit CU network;
  • the first execution module 1202 is configured to send a first instruction message in the case of executing the first handover command, instructing the second IAB node to execute the second handover command associated with the first handover command, the second IAB node is the downstream node of the first IAB node.
  • the first switching command is a conditional switching command.
  • the first IAB node 1200 further includes:
  • a second receiving module configured to receive a third handover command sent by the upstream node of the first IAB node or the source CU network;
  • a third sending module configured to send the third handover command to the terminal served by the first IAB node when the first handover command is executed.
  • the first IAB node 1200 further includes:
  • a third receiving module configured to receive the second handover command, or the second handover command and the fourth handover command sent by the upstream node of the first IAB node or the source CU network; the fourth handover command is the same as the The terminal corresponding to the second IAB node service;
  • the first indication information carries the second handover command, or carries the second handover command and the fourth handover command.
  • the interrelated handover commands are defined as a handover command set
  • the first indication message indicates the handover command set to which the first handover command belongs
  • the second handover command includes the following handover command At least one of: the handover command set to which the first handover command belongs, the handover command corresponding to the second IAB node, and the handover command set to which the first handover command belongs, the same as the handover command set to which the second IAB node belongs.
  • the switching command corresponding to the serving terminal is defined as a handover command set
  • the first indication message indicates the handover command set to which the first handover command belongs
  • the second handover command includes the following handover command At least one of: the handover command set to which the first handover command belongs, the handover command corresponding to the second IAB node, and the handover command set to which the first handover command belongs, the same as the handover command set to which the second IAB node belongs.
  • the interrelated handover commands are defined as a handover command set, and the first IAB node 1200 further includes:
  • the fourth receiving module is configured to receive a second indication message, where the second indication message indicates the handover command set to which the received handover command belongs.
  • the first IAB node 1200 provided in this embodiment of the present application can implement each process in the method embodiment of FIG. 9 , and to avoid repetition, details are not repeated here.
  • the execution body may be the first IAB node shown in FIG. 12 , or a control module in the first IAB node for executing the handover method.
  • a method for performing a handover performed by a first IAB node is used as an example to describe the apparatus provided by the embodiment of the present application.
  • FIG. 13 is a structural diagram of a second IAB node provided by an embodiment of the present application.
  • the second IAB node 1300 may be an IAB node having an upstream IAB node in the IAB network to be switched. As shown in FIG. 13 , the The second IAB node 1300 includes:
  • a fifth receiving module 1301, configured to receive a first indication message sent by a first IAB node; the first IAB node is an upstream node of the second IAB node, and the first IAB node corresponds to a first handover command;
  • the second execution module 1302 is configured to execute a second handover command corresponding to the second IAB node and associated with the first handover command.
  • the second IAB node 1300 further includes:
  • a sixth receiving module configured to receive a fourth handover command associated with the first handover command
  • a fourth sending module configured to send the fourth handover command to a terminal served by the second IAB node when the second handover command is executed.
  • the first indication message carries the second handover command, or carries the second handover command and a fourth handover command, and the fourth handover command serves with the second IAB node
  • the terminal corresponds to and is associated with the first handover command.
  • the interrelated handover commands are defined as a handover command set
  • the first indication message indicates the handover command set to which the first handover command belongs
  • the second handover command includes the following handover command At least one of: among the received handover commands sent by the source centralized unit CU network, the handover commands belonging to the handover command set indicated by the first indication message and corresponding to the second IAB node, and the received handover commands
  • the handover command sent by the source CU network belongs to the handover command set indicated by the first indication message and corresponds to the terminal served by the second IAB node.
  • the interrelated handover commands are defined as a handover command set, and the second IAB node 1300 further includes:
  • a seventh receiving module configured to receive a second indication message, where the second indication message indicates a handover command set to which the received handover command belongs.
  • the host IAB node shown in FIG. 11 , the first IAB node shown in FIG. 12 , and the second IAB node shown in FIG. 13 may be devices, or components, integrated circuits, or chips in network-side equipment.
  • an embodiment of the present application further provides a network-side device 1400 , including a processor 1401 , a memory 1402 , and a program or instruction stored in the memory 1402 and executable on the processor 1401 , when the program or instruction is executed by the processor 1401, each process of the above switching method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, details are not described here.
  • the network side device 1500 includes: an antenna 1501 , a radio frequency device 1502 , and a baseband device 1503 .
  • the antenna 1501 is connected to the radio frequency device 1502 .
  • the radio frequency device 1502 receives information through the antenna 1501, and sends the received information to the baseband device 1503 for processing.
  • the baseband device 1503 processes the information to be sent and sends it to the radio frequency device 1502
  • the radio frequency device 1502 processes the received information and sends it out through the antenna 1501 .
  • the above-mentioned frequency band processing apparatus may be located in the baseband apparatus 1503 , and the method performed by the network side device in the above embodiments may be implemented in the baseband apparatus 1503 .
  • the baseband apparatus 1503 includes a processor 1504 and a memory 1505 .
  • the baseband device 1503 may include, for example, at least one baseband board on which multiple chips are arranged, as shown in FIG. 15 , one of the chips is, for example, the processor 1504 , which is connected to the memory 1505 to call the program in the memory 1505 to execute
  • the network-side device shown in the above method embodiments operates.
  • the baseband device 1503 may further include a network interface 1506 for exchanging information with the radio frequency device 1502, and the interface is, for example, a common public radio interface (CPRI for short).
  • CPRI common public radio interface
  • the network-side device in the embodiment of the present invention further includes: an instruction or program stored in the memory 1505 and executable on the processor 1504, and the processor 1504 invokes the instruction or program in the memory 1505 to execute FIG. 11 or FIG. 12 or
  • the method performed by each module shown in FIG. 13 achieves the same technical effect. To avoid repetition, it is not repeated here.
  • An embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the switching method shown in FIG. 3 or the switching shown in FIG. 9 is implemented. method or each process of the switching method embodiment shown in FIG. 10 , and can achieve the same technical effect, to avoid repetition, details are not repeated here.
  • the processor is the processor in the electronic device described in the foregoing embodiments.
  • the readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
  • An embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a network-side device program or instruction to implement the above-mentioned FIG. 3
  • the switching method shown in FIG. 9 or the switching method shown in FIG. 9 or each process of the switching method embodiment shown in FIG. 10 can achieve the same technical effect. To avoid repetition, details are not repeated here.
  • the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip, or the like.
  • modules, units, sub-modules, sub-units, etc. can be implemented in one or more Application Specific Integrated Circuits (ASIC), Digital Signal Processing (DSP), digital signal processing equipment ( DSP Device, DSPD), Programmable Logic Device (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general-purpose processor, controller, microcontroller, microprocessor, for in other electronic units or combinations thereof that perform the functions described herein.
  • ASIC Application Specific Integrated Circuits
  • DSP Digital Signal Processing
  • DSP Device digital signal processing equipment
  • PLD Programmable Logic Device
  • Field-Programmable Gate Array Field-Programmable Gate Array
  • FPGA Field-Programmable Gate Array

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Abstract

L'invention concerne un procédé et un appareil de commutation, ainsi qu'un dispositif associé. Le procédé de commutation comprend : l'envoi d'un ensemble de commandes associées de commutation à un nœud de réception de commande dans un réseau IAB à commuter, ledit réseau IAB comprenant un nœud IAB et un terminal, et l'ensemble de commandes de commutation correspondant au nœud IAB et au terminal dans ledit réseau IAB.
PCT/CN2021/110910 2020-08-06 2021-08-05 Procédé et appareil de commutation, et dispositif associé WO2022028541A1 (fr)

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CN110536350A (zh) * 2019-02-14 2019-12-03 中兴通讯股份有限公司 Iab链路控制方法、通信单元、计算机可读存储介质
CN111093286A (zh) * 2019-08-15 2020-05-01 中兴通讯股份有限公司 连接建立方法、装置、集合接入回传节点及存储介质
CN111148163A (zh) * 2018-11-02 2020-05-12 华为技术有限公司 通信方法及装置

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WO2020134215A1 (fr) * 2018-12-29 2020-07-02 Telefonaktiebolaget Lm Ericsson (Publ) Procédé permettant à un noeud de réseau de changer le format de sous-en-tête de commande d'accès au support, et appareil de noeud de réseau

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US20160165508A1 (en) * 2013-07-30 2016-06-09 Huawei Technologies Co., Ltd. Network Handover Method, Apparatus, Device, and System
CN111148163A (zh) * 2018-11-02 2020-05-12 华为技术有限公司 通信方法及装置
CN110536350A (zh) * 2019-02-14 2019-12-03 中兴通讯股份有限公司 Iab链路控制方法、通信单元、计算机可读存储介质
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