Conditional reset method and apparatus

Abstract

A method and apparatus for conditional reconfiguration are provided, the method being used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node, the method including: selecting one first cell that satisfies a conditional reconfiguration condition as a second cell from conditional reconfiguration candidate cells; and initiating a conditional reconfiguration execution in the second cell.

Description

[Technical Field]

[0001] The present invention relates to the field of communications. [Background technology]

[0002] Integrated access and backhaul (IAB) ensures radio relay in NG-RAN. A relay node, i.e., an IAB node, can support NR access and backhaul. Backhaul can include single-hop or multi-hop. The network-side NR backhaul end point, i.e., an IAB donor, refers to a gNB that supports additional IAB functions. An IAB donor is also called an IAB donor node.

[0003] The IAB node supports the functionality of a gNB-DU (Distributed Unit), i.e., the IAB-DU. The IAB-DU terminates the NR access interface for the terminal device and the next-hop IAB node, and also terminates the F1 protocol for the gNB-CU function on the IAB donor. The IAB node also supports a subset of terminal device functions (UE functions), i.e., the IAB-MT, which includes, for example, the physical layer, Layer 2 (L2), Radio Resource Control (RRC), and Non-Access-Stratum (NAS) functions for a gNB-DU connected to another IAB node or IAB donor, a gNB-CU (Centralized Unit) connected to the IAB donor, and the core network.

[0004] An IAB node is connected to an IAB donor by a single hop or multiple hops. In the topology, the IAB donor is the root node, the adjacent node on the IAB-DU interface of the IAB node is called the descendant node of the IAB node, i.e., the descendant IAB-node, and the adjacent node on the IAB-MT interface is called the parent node, i.e., the parent IAB-node.

[0005] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention and to facilitate understanding by those skilled in the art, and these technical solutions described in the background art of the present invention should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0006] In the IAB architecture, IAB node migration may be required in some cases. IAB node migration may also be referred to as IAB node topology adaptation. For example, an IAB node may decide to migrate from an original path to a new path after link quality measurement, where the original path is called the source path and the new path is called the target path. The IAB node that performs the migration is called a migration IAB node.

[0007] One IAB node migration or topology adaptation scenario may include intra-IAB-donor-CU and inter-IAB-donor-CU migration or topology adaptation.

[0008] In the case of a migration or topology adaptation scenario within an IAB-donor-CU of one IAB node, both the source parent IAB node and the target parent IAB node are served by the same IAB-donor-CU, the target parent IAB node can use a different IAB donor DU (IAB-donor-DU) than the source parent IAB node, and the source path and the target path can have common nodes.

[0009] Rel-17 eIAB can support inter-CU (inter-CU) IAB migration, where in the case of an IAB node inter-IAB-donor-CU migration or topology adaptation scenario, the source parent IAB node and the target parent IAB node are served by different IAB-donor-CUs, and the target parent IAB node uses a different IAB-donor-DU than the source parent IAB node.

[0010] The network can set some conditional reconfiguration candidate cells and conditional reconfiguration conditions (conditions for conditional reconfiguration) for the terminal device and / or the IAB-MT of the IAB node. The terminal device and / or the IAB-MT can perform evaluation based on the conditional reconfiguration conditions, and apply the corresponding configuration when the evaluation conditions are satisfied.

[0011] For a terminal device, specifically, in conditional reconfiguration, the network configures one or more candidate target special cells, i.e., conditional reconfiguration candidate cells, for the terminal device. The terminal device evaluates the conditions of each configured candidate target special cell. The terminal device applies conditional reconfiguration to one of the target special cells that satisfies the associated execution condition. The network provides the configuration parameters of the target special cell in the ConditionalReconfiguration IE.

[0012] Based on the received ConditionalReconfiguration IE, the terminal device performs the following behavior: If ConditionalReconfiguration includes condReconfigToRemoveList, perform the conditional reconfiguration removal process; and Performs conditional reconfiguration increments and / or modifications if ConditionalReconfiguration includes condReconfigToAddModList.

[0013] In an embodiment of the present invention, the conditional reset increments and / or modifications include: For each received condReconfigId in the condReconfigToAddModList, the UE shall: If there is one entry in condReconfigToAddModList in VarConditionalReconfig that matches condReconfigId, If this entry in condReconfigToAddModList contains one condExecutionCond, replace this entry with the received value of this condReconfigId; If this entry in condReconfigToAddModList contains one condRRCReconfig, replace this entry with the received value of this condReconfigId; Otherwise, increment a new entry for this condReconfigId in VarConditionalReconfig, Then, a conditional reset evaluation (conditional reset evaluation) is performed.

[0014] In an embodiment of the present invention, the conditional reset evaluation includes: The terminal device For each condReconfigId in VarConditionalReconfig, A cell whose physical cell identity (PCI) matches the value indicated in ServingCellConfigCommon included in reconfigurationWithSync in the received condRRCReconfig is considered to be an applicable cell; For each measId included in the measIdList in VarMeasConfig indicated in the condExecutionCond associated with the condReconfigId, consider an event associated with measId satisfied if the entrance conditions for this event associated with condReconfigId are met, i.e., for the event corresponding to the condEventId(s) of the corresponding condTriggerConfig in VarConditionalReconfig, the applicable cell, the corresponding timeToTrigger period defined for this event in VarConditionalReconfig, and all measurements after layer 3 filtering are satisfied; consider an event associated with measId as not satisfied if the departure condition for this event associated with condReconfigId is met, i.e., for the event corresponding to condEventId(s) in the corresponding condTriggerConfig in VarConditionalReconfig, the applicable cell, the corresponding timeToTrigger period defined for this event in VarConditionalReconfig, and all measurements after layer 3 filtering are satisfied; For one target candidate cell in the stored condRRCReconfig, if all events associated with all measId(s) in condTriggerConfig are satisfied, Consider this target candidate cell associated with the condReconfigId in the stored condRRCReconfig as one trigger cell; Then, the conditional reset execution (conditional reset execution) is started.

[0015] Conditional reset execution includes: The terminal device If there is one trigger cell, select one trigger cell as the selected cell for conditional reconfiguration execution; For the selected cell for the conditional reconfiguration, the stored condRRCReconfig of this selected cell is applied. Conditional reconfiguration includes two cases: conditional handover (CHO) and conditional primary / secondary cell (PSCell) change.

[0016] The inventors have discovered that when an IAB node performs a transition within or between IAB-donor-CUs, it takes a significant amount of time, and if the IAB-MT radio link deteriorates quickly, the transition may fail. In such a case, according to the current mechanism, the terminal device performs Radio Link Failure (RLF) recovery by RRC re-establishment, which may result in a long service interruption and a degraded experience for users served by this IAB node and its next generation IAB nodes.

[0017] To solve one or more of the above problems, embodiments of the present invention provide a method and apparatus for conditional reconfiguration. When an IAB node performs a transition, the conditional reconfiguration mechanism can be appropriately implemented to reduce the time of business interruption and improve user experience. [Means for solving the problem]

[0018] According to a first aspect of an embodiment of the present invention, there is provided an apparatus for conditional reconfiguration, the apparatus being used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node, the apparatus comprising: a first selection unit, used for selecting one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and A first execution unit is included that is used to initiate conditional reset execution in the second cell.

[0019] According to a second aspect of an embodiment of the present invention, there is provided an apparatus for conditional reconfiguration, the apparatus being used in a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, the apparatus comprising: a first receiving unit, used for receiving a measurement report or a control protocol data unit (PDU) for flow control feedback; and A first determination unit is used to determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0020] According to a third aspect of an embodiment of the present invention, there is provided an apparatus for conditional reconfiguration, the apparatus being used in a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, the apparatus comprising: a second receiving unit used to receive control protocol data units for measurement reports or flow control feedback; and A second transmission unit is included, which is used to transmit the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0021] According to a fourth aspect of an embodiment of the present invention, there is provided an apparatus for conditional reconfiguration, the apparatus being adapted for use in a source IAB donor node of a first IAB node, the apparatus comprising: a third receiving unit, used for receiving a measurement report or a control protocol data unit for flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and A second determination unit is included, which is used to determine a conditional reconfiguration decision based on the measurement report, the control protocol data unit, the downlink data transmission status protocol data unit, or the radio link failure notification.

[0022] According to a fifth aspect of an embodiment of the present invention, there is provided a terminal device, the terminal device including the device according to the first aspect of the embodiment of the present invention.

[0023] According to a sixth aspect of an embodiment of the present invention, there is provided a network device, the network device being a first IAB node or a child IAB node of the first IAB node, the network device including the device according to the first aspect of the embodiment of the present invention.

[0024] According to a seventh aspect of an embodiment of the present invention, there is provided a network device, the network device being a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, the network device including the device according to the second aspect of the embodiment of the present invention.

[0025] According to an eighth aspect of an embodiment of the present invention, there is provided a network device, the network device being a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, and the network device includes the device described in the third aspect of the embodiment of the present invention.

[0026] According to a ninth aspect of an embodiment of the present invention, there is provided a network device, the network device being a source IAB donor node of a first IAB node, the network device including the device according to the fourth aspect of the embodiment of the present invention.

[0027] According to a tenth aspect of an embodiment of the present invention, there is provided a communication system, the communication system including at least one of a terminal device according to the fifth aspect, a network device according to the sixth aspect, a network device according to the eighth aspect, and a network device according to the ninth aspect.

[0028] According to an eleventh aspect of an embodiment of the present invention, there is provided a method for conditional reconfiguration, the method being used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node, the method comprising: Selecting one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and Initiating a conditional reset execution in the second cell.

[0029] According to a twelfth aspect of an embodiment of the present invention, there is provided a method for conditional reconfiguration, the method being used in a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, the method comprising: Receive a control protocol data unit (PDU) for measurement report or flow control feedback; and determining a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0030] According to a thirteenth aspect of an embodiment of the present invention, there is provided a method for conditional reconfiguration, the method being used in a second IAB node, the second IAB node being a source parent IAB node of a first IAB node, the method comprising: receiving a control protocol data unit for measurement reporting or flow control feedback; and and transmitting the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0031] According to a fourteenth aspect of an embodiment of the present invention, there is provided a method for conditional reconfiguration, the method being used in a source IAB donor node of a first IAB node, the method comprising: receiving a control protocol data unit for measurement reports or flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and determining a conditional reconfiguration decision based on the measurement report, or the control protocol data unit, or the downlink data transmission status protocol data unit, or the radio link failure notification.

[0032] According to a fifteenth aspect of an embodiment of the present invention, there is provided a computer-readable program, which, when executed on a conditional reset device or terminal device, causes the conditional reset device or terminal device to perform a conditional reset method according to any one of the eleventh to fourteenth aspects of an embodiment of the present invention.

[0033] According to a sixteenth aspect of an embodiment of the present invention, there is provided a storage medium storing a computer-readable program, wherein the computer-readable program causes a conditional reconfiguration device or a terminal device to execute the conditional reconfiguration method described in any one of the eleventh to fourteenth aspects of the embodiment of the present invention. [Effects of the Invention]

[0034] One of the advantageous effects of the embodiment of the present invention is that when an IAB node performs migration, by properly introducing a conditional reconfiguration mechanism, the time of business interruption can be reduced and user experience can be improved.

[0035] The following description and reference to the drawings disclose in detail particular embodiments of the present invention, illustrating ways in which the principles of the present invention may be employed, but the scope of the present invention is not limited thereto, and various changes, modifications, and alternatives may be included within the scope of the appended claims.

[0036] Additionally, features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0037] It should be noted that when used in this specification, terms such as "comprise / have" refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief explanation of the drawings]

[0038] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in several drawings and to indicate corresponding parts used in several embodiments.

[0039] The included drawings are used to provide a further understanding of the embodiments of the present invention, and these drawings constitute a part of this specification, illustrate embodiments of the present invention, and together with the written description, serve to explain the principles of the present invention. Also, it is apparent that the drawings described below are only for illustrating some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without any creative effort. [Figure 1] FIG. 1 is a diagram illustrating the overall architecture of an IAB in an embodiment of the present invention. [Figure 2] FIG. 2 is another diagram illustrating the overall IAB architecture in an embodiment of the present invention. [Figure 3] FIG. 10 is a diagram showing the protocol stack of the F1-U interface between the IAB-DU and the IAB-donor-CU. [Figure 4] FIG. 10 is a diagram showing the protocol stack of the F1-C interface between the IAB-DU and the IAB-donor-CU. [Figure 5] FIG. 10 is a diagram showing a protocol stack of an SRB between an IAB-MT and an IAB-donor-CU in an embodiment of the present invention. [Figure 6] FIG. 10 illustrates a scenario of IAB-donor-CU intra-migration or topology adaptation of one IAB node in an embodiment of the present invention. [Figure 7] FIG. 1 illustrates a scenario of IAB-donor-CU migration or topology adaptation for one IAB node in an embodiment of the present invention. [Figure 8] 1 is a flowchart of a method for conditional switching in an IAB-donor-intra-CU transition scenario according to an embodiment of the present invention. [Figure 9] FIG. 2 is a diagram illustrating a conditional resetting method according to the first embodiment of the present invention. [Figure 10] FIG. 9 is a diagram showing a method of implementing step 901 in the first embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing a method of implementing step 1002 in the first embodiment of the present invention. [Figure 12] FIG. 11 is a diagram showing a method of implementing step 1101 in the first embodiment of the present invention. [Figure 13] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 14] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 15] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 16] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 17] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 18] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 19] FIG. 11 is another diagram illustrating the method of implementing step 1101 in the first embodiment of the present invention. [Figure 20] 1 is a flowchart of a conditional reset method according to a first embodiment of the present invention; [Figure 21] 1 is another flowchart of the conditional reset method in accordance with the first embodiment of the present invention; [Figure 22] 1 is a flowchart of a method for conditional reconfiguration in an IAB-donor-CU intra-transition scenario according to a first embodiment of the present invention; [Figure 23] 1 is a flowchart of a method for conditional reconfiguration in an IAB-donor-CU transition scenario according to a first embodiment of the present invention; [Figure 24] FIG. 10 is a diagram illustrating a conditional resetting method according to a second embodiment of the present invention. [Figure 25] FIG. 10 is a diagram illustrating a conditional resetting method according to a third embodiment of the present invention. [Figure 26] FIG. 10 is a diagram illustrating a conditional resetting method according to a fourth embodiment of the present invention. [Figure 27] FIG. 10 is a diagram illustrating a conditional resetting method according to a fifth embodiment of the present invention. [Figure 28] FIG. 13 is a diagram illustrating a conditional resetting method according to a sixth embodiment of the present invention. [Figure 29] FIG. 10 is a diagram illustrating a conditional resetting device according to a seventh embodiment of the present invention. [Figure 30] FIG. 10 is a diagram showing a first selection unit in Example 7 of the present invention. [Figure 31] FIG. 10 is a diagram illustrating a second confirmation unit according to a seventh embodiment of the present invention. [Figure 32] FIG. 10 is a diagram showing a second selection unit in Example 7 of the present invention. [Figure 33] FIG. 10 is another diagram showing the second selection unit in Example 7 of the present invention. [Figure 34] FIG. 10 is another diagram showing the second selection unit in Example 7 of the present invention. [Figure 35] FIG. 10 is another diagram showing the second selection unit in Example 7 of the present invention. [Figure 36]FIG. 10 is another diagram showing the second selection unit in Example 7 of the present invention. [Figure 37] FIG. 10 is a diagram illustrating a conditional resetting device according to an eighth embodiment of the present invention. [Figure 38] FIG. 10 is a diagram illustrating a conditional resetting device according to a ninth embodiment of the present invention. [Figure 39] FIG. 19 is a diagram showing a conditional resetting device according to a tenth embodiment of the present invention. [Figure 40] FIG. 20 is a block diagram showing the system configuration of a terminal device according to an eleventh embodiment of the present invention. [Figure 41] FIG. 23 is a block diagram showing a system configuration of a network device according to a twelfth embodiment of the present invention. [Figure 42] FIG. 22 is a diagram illustrating a communication system according to a thirteenth embodiment of the present invention. [Figure 43] FIG. 20 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Figure 44] FIG. 20 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Figure 45] FIG. 20 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] The foregoing and other features of the present invention will become more apparent from the following detailed description and the accompanying drawings, in which: While the specification and drawings disclose particular embodiments of the present invention, these illustrate only some of the embodiments which may employ the principles of the present invention, and it is to be understood that the present invention is not limited to the described embodiments, but rather includes all modifications, variations, and alternatives which fall within the scope of the appended claims.

[0041] In embodiments of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as LTE (Long Term Evolution), LTE-A (LTE-Advanced), WCDMA (Wideband Code Division Multiple Access), HSPA (High-Speed ​​Packet Access), etc.

[0042] Additionally, communication between devices in a communication system may occur according to any stage of communication protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and future 5G, New Radio (NR), and / or other conventional or future-developed communication protocols.

[0043] In the embodiments of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device in a communication system, for example, a network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0044] The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a 5G base station (gNB), etc., and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low-power node (e.g., femto, pico, etc.). The term "base station" may include some or all of the functions thereof, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or the area it covers, depending on the context of the term.

[0045] In embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives services from the network, for example, via a network device. A User Equipment may be fixed or mobile, and may also be referred to as a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0046] Among these, user devices may include, but are not limited to, cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, portable devices, machine-type communication devices, laptop computers, cordless phones, smartphones, smart watches, digital cameras, etc.

[0047] Furthermore, for example, in a scenario such as the Internet of Things (IoT), the user equipment may also be a monitoring or measuring device or apparatus, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0048] The following describes a scenario of an embodiment of the present invention based on an example, but the present invention is not limited thereto.

[0049] Figure 1 is a diagram showing the overall IAB architecture of an embodiment of the present invention. As shown in Figure 1, the overall IAB architecture uses a duplex (SA) mode. Figure 2 is another diagram showing the overall IAB architecture of an embodiment of the present invention. As shown in Figure 2, the overall IAB architecture uses a dual connectivity (EN-DC) mode. In the dual connectivity mode, an IAB node is connected to one MeNB via E-UTRA, and the IAB donor terminates X2-C as an SgNB.

[0050] Figure 3 shows the protocol stack of the F1-U interface between the IAB-DU and IAB-donor-CU. Figure 4 shows the protocol stack of the F1-C interface between the IAB-DU and IAB-donor-CU. In Figures 3 and 4, F1-U and F1-C are explained using a two-hop backhaul as an example.

[0051] In an embodiment of the present invention, F1-U and F1-C use an IP transmission layer between IAB-DU and IAB-donor-CU, and F1-U and F1-C have security protection. In an embodiment of the present invention, in wireless backhaul, the IP layer is carried by a Backhaul Adaptation Protocol (BAP) sublayer, which ensures multi-hop routing, and the IP layer may be used for non-F1 tasks, such as Operation, Administration and Maintenance (OAM) tasks.

[0052] In an embodiment of the present invention, in each backhaul link, BAP PDUs are transmitted by a BH RLC channel, and multiple BH RLC channels can be configured in each BH link, thus allowing traffic prioritization and QoS enforcement.

[0053] In an embodiment of the present invention, the BAP entity on each IAB node and IAB-donor-DU performs the mapping of BAP PDUs to BH RLC channels.

[0054] In an embodiment of the present invention, the IAB-MT establishes SRBs with the IAB-donor-CU to carry RRC and NAS. Figure 5 shows the protocol stack of the SRB between the IAB-MT and the IAB-donor-CU in an embodiment of the present invention.

[0055] In an embodiment of the present invention, for an IAB node operating under EN-DC mode, the IAB-MT further establishes one or more DRBs with the IAB-donor-CU, which may be used, for example, to transport OAM services. For SA mode, the establishment of DRBs is optional. These SRBs and DRBs are transported between this IAB-MT and its parent node via the Uu interface channel.

[0056] 6 illustrates a scenario of intra-IAB-donor-CU migration or topology adaptation of one IAB node according to an embodiment of the present invention. As shown in FIG. 6, IAB-node 5 is a migration IAB node, IAB-node 3 is the source parent IAB node of IAB-node 5, IAB-node 4 is the destination parent IAB node of IAB-node 5, and IAB-node 3 and IAB-node 4 are connected to the same IAB-donor-CU and different IAB-donor-DUs. UE 1 is a terminal device served by IAB-node 5, and IAB-node 6 is a child IAB node served by IAB-node 5.

[0057] 7 illustrates an IAB node IAB-donor-CU inter-transition or topology adaptation scenario according to an embodiment of the present invention. As shown in FIG. 7, IAB-node 5 is a transition node, IAB-node 3 is the source parent IAB node of IAB-node 5, IAB-node 4 is the destination parent IAB node of IAB-node 5, and IAB-node 3 and IAB-node 4 are connected to different IAB-donor-CUs and different IAB-donor-DUs. UE 1 is a terminal device served by IAB-node 5, and IAB-node 6 is a child IAB node served by IAB-node 5.

[0058] For example, when IAB-node 5 in Figures 6 and 7 performs a transition within or between IAB-donor-CUs, it may take a considerable amount of time, and if the radio link of the IAB-MT deteriorates quickly, the transition may fail. In such a case, according to the current mechanism, UE1 performs radio link failure (RLF) recovery by RRC re-establishment, which may result in a long service interruption and a degraded experience for users served by IAB-node 5 and its next generation IAB node, i.e., IAB-node 6.

[0059] The network can configure several conditional reconfiguration candidate cells and conditional reconfiguration conditions for the terminal device and / or the IAB-MT of the IAB node, and the terminal device and / or the IAB-MT performs evaluation based on the conditional reconfiguration conditions and provides corresponding configuration when the evaluation conditions are satisfied.

[0060] A specific explanation will be given using IAB-MT as an example.

[0061] Specifically, in conditional reconfiguration, the network, e.g., IAB-donor, or IAB-donor-CU, or source IAB-donor, or source IAB-donor-CU, configures one or more candidate target special cells, i.e., conditional reconfiguration candidate cells, for the IAB node. The IAB-MT evaluates the conditions of each candidate target special cell to be configured. The IAB-MT applies conditional reconfiguration to one of the target special cells that satisfies the associated execution condition. The network provides the configuration parameters of the target special cell in the ConditionalReconfiguration IE.

[0062] Based on one received ConditionalReconfiguration IE, the IAB-MT performs the following actions: If ConditionalReconfiguration includes condReconfigToRemoveList, perform the conditional reconfiguration removal process; and Performs conditional reconfiguration increments and / or modifications if ConditionalReconfiguration includes condReconfigToAddModList.

[0063] In an embodiment of the present invention, the conditional reset increments and / or modifications include: For each received condReconfigId in the condReconfigToAddModList, the IAB-MT shall: If there is one entry in condReconfigToAddModList in VarConditionalReconfig that matches condReconfigId, If this entry in condReconfigToAddModList contains one condExecutionCond, replace this entry with the received value of this condReconfigId; If this entry in condReconfigToAddModList contains one condRRCReconfig, replace this entry with the received value of this condReconfigId; Otherwise, increment a new entry for this condReconfigId in VarConditionalReconfig, Then, a conditional reset evaluation is performed.

[0064] In an embodiment of the present invention, the conditional reset evaluation includes: IAB-MT is For each condReconfigId in VarConditionalReconfig, A cell whose physical cell identity (PCI) matches the value indicated in ServingCellConfigCommon included in reconfigurationWithSync in the received condRRCReconfig is considered to be an applicable cell; For each measId included in the measIdList in VarMeasConfig indicated in the condExecutionCond associated with the condReconfigId, An event associated with measId is considered satisfied if the entrance conditions for this event associated with condReconfigId are met, i.e., for the event corresponding to the condEventId(s) of the corresponding condTriggerConfig in VarConditionalReconfig, the corresponding timeToTrigger period defined for this event in the applicable cell, VarConditionalReconfig, and all measurements after layer 3 filtering are satisfied; consider an event associated with measId as not satisfied if the departure condition for this event associated with condReconfigId is met, i.e., for the event corresponding to condEventId(s) of the corresponding condTriggerConfig in VarConditionalReconfig, the corresponding timeToTrigger period defined for this event in the applicable cell, VarConditionalReconfig, and all measurements after layer 3 filtering are satisfied; For one target candidate cell in the stored condRRCReconfig, if all events associated with all measId(s) in condTriggerConfig are satisfied, Consider this target candidate cell associated with the condReconfigId in the stored condRRCReconfig as one trigger cell; Then, the conditional reset execution is initiated.

[0065] Conditional reset execution includes: IAB-MT is If there is one trigger cell, select one trigger cell as the selected cell for conditional reconfiguration execution; For the selected cell for the conditional reconfiguration execution, the stored condRRCReconfig of this selected cell is applied.

[0066] In an embodiment of the present invention, the conditional reconfiguration may include two cases: conditional handover (CHO) and conditional primary-secondary cell (PSCell) change.

[0067] 8 is a flowchart of a method for conditional switching in an IAB-donor-CU transition scenario according to an embodiment of the present invention. As shown in FIG. 8, the method includes the following steps:

[0068] Step 801: The source IAB donor node makes a conditional reconfiguration decision; Step 802: The source IAB donor node sends a downlink F1 message to the source parent IAB node, which is used to carry the RRC reconfiguration message; Step 803: The source parent IAB node sends the RRC reconfiguration message to the first IAB node, which includes information about the conditional reconfiguration; Step 804: The first IAB node sends an RRC reconfiguration complete message to the source parent IAB node; Step 805: The source parent IAB node sends an uplink F1 message to the source IAB donor node, which is used to carry the RRC reconfiguration complete message; Step 806: The first IAB node initiates a conditional reconfiguration run; and Step 807: Complete the conditional reset.

[0069] That is, when an IAB node performs a transition, a conditional reset mechanism is appropriately introduced, and the specific content of the conditional reset will be described in detail in the following embodiments.

[0070] Various embodiments of the present invention will now be described with reference to the accompanying drawings, which are merely illustrative and not limiting of the present invention. [Example]

[0071] In an embodiment of the present invention, a method for conditional reconfiguration is provided, which is used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node.

[0072] 9 is a diagram illustrating a method for conditional resetting in the first embodiment of the present invention. As shown in FIG. 9, the method includes the following steps:

[0073] Step 901: Select one first cell that satisfies the conditional resetting condition from the conditional resetting candidate cells as a second cell; and Step 902: Initiate conditional reset execution in the second cell.

[0074] In an embodiment of the present invention, the first IAB node is a transition IAB node.

[0075] In the embodiment of the present invention, the parent IAB node refers to the parent IAB node of the first IAB node, and the child IAB node refers to the child IAB node of the first IAB node.

[0076] In this way, by properly implementing a conditional reconfiguration mechanism when an IAB node undergoes a migration, it is possible to reduce the duration of business interruptions and improve the user experience.

[0077] In an embodiment of the present invention, the conditional reconfiguration may include a conditional switchover (CHO) and / or a conditional PSCell change.

[0078] In the embodiment of the present invention, the conditional resetting candidate cell may be called an applicable cell or a target candidate cell.

[0079] In an embodiment of the present invention, the conditional resetting candidate cells may include conditional handover (CHO) candidate cells and / or conditional PSCell change candidate cells.

[0080] For example, conditional reconfiguration candidate cells include conditional switching candidate cells, i.e., cells whose reconfigurationWithSync is included in the masterCellGroup of the variable VarConditionalReconfig, and / or conditional PSCell change cells, i.e., cells whose reconfigurationWithSync is included in the secondaryCellGroup of the variable VarConditionalReconfig.

[0081] In the embodiment of the present invention, the first cell is also referred to as a trigger cell, and the second cell is also referred to as a selection cell.

[0082] In an embodiment of the present invention, the conditional reconfiguration execution may include applying a corresponding stored configuration, which may be a configuration corresponding to a stored conditional switching (CHO) candidate cell or a conditional PSCell change candidate cell.

[0083] In an embodiment of the present invention, the conditional reset condition may be referred to as a condition for performing the conditional reset.

[0084] In an embodiment of the present invention, the conditional reset condition may include at least one of the following conditions: 1) detecting a radio link failure of the link between its parent IAB node; 2) receiving a radio link failure notification from the parent IAB node; 3) receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; 4) receiving a second indication of flow control from the parent IAB node; 5) The quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or PSCell, or the quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or PSCell by one offset; 6) The quality of the PCell and / or PSCell becomes worse than a first threshold, and the quality of one conditional reconfiguration candidate cell becomes better than a second threshold; and 7) The quality of one conditional resetting candidate cell becomes better than the third threshold, or the quality of one conditional resetting candidate cell becomes one offset better than the third threshold.

[0085] In an embodiment of the present invention, the first set of conditions may include the above conditions 1) to 4), and the second set of conditions may include the above conditions 5) to 7).

[0086] When one condition in the first set of conditions is satisfied, the conditional resetting candidate cell / conditional switching candidate cell / conditional PSCell change candidate cell is considered as the first cell, i.e., if a cell is a conditional resetting cell / conditional switching candidate cell / conditional PSCell change candidate cell, this cell is the first cell; or when the MCG satisfies one condition in the first set of conditions, the conditional switching candidate cell is considered as the first cell, i.e., if a cell is a conditional switching candidate cell, this cell is the first cell; or when the SCG satisfies one condition in the first set of conditions, the conditional PSCell change candidate cell is considered as the first cell, i.e., if a cell is a conditional PSCell change candidate cell, this cell is the first cell.

[0087] The MCG satisfying one condition in the first set of conditions includes: detecting an MCG radio link failure with its parent IAB node; or receiving from the MCG a radio link failure notification from the parent IAB node; or receiving from the MCG a first instruction from the parent IAB node to trigger a conditional reconfiguration; or receiving from the MCG a second instruction for flow control from the parent IAB node.

[0088] The SCG satisfying one condition in the first set of conditions includes: detecting an SCG radio link failure with its parent IAB node; or receiving from the SCG a radio link failure notification from the parent IAB node; or receiving from the SCG a first instruction from the parent IAB node to trigger a conditional reconfiguration; or receiving from the SCG a second instruction for flow control from the parent IAB node.

[0089] In the above-mentioned condition 2) and / or condition 3), for example, the radio link failure notification and / or the first instruction may be received by a BAP control PDU; or the radio link failure notification and / or the first instruction may be received by a system message; or the radio link failure notification and / or the first instruction may be received by a paging message.

[0090] In an embodiment of the present invention, when the radio link failure notification and / or the first instruction are received by a paging message, at least one of the radio link failure notification and the first instruction may be included in a short message of the paging message and indicated by downlink control information (DCI).

[0091] Alternatively, when the radio link failure notification and / or the first instruction is received by a system message, the update instruction for the system message may be included in a short message of a paging message and indicated by downlink control information (DCI).

[0092] In the above condition 3), the radio link failure notification may include at least one of a Type-4 radio link failure notification, a Type-2 radio link failure notification, and a Type-3 radio link failure notification.

[0093] For example, a Type-4 radio link failure notification means that the parent IAB node's RRC re-establishment process has failed, a Type-2 radio link failure notification means that the parent IAB node has detected a radio link failure, and a Type-3 radio link failure notification means that the parent IAB node has canceled or recovered from the radio link failure.

[0094] In the above condition 4), for example, receiving a second flow control instruction from the parent IAB node includes receiving a second instruction based on available buffer size or buffer overload.

[0095] For example, the second indication includes information indicating the available buffer size and / or information indicating its parent IAB node buffer overload.

[0096] Regarding the second indication based on the available buffer size, for example, the second indication based on the available buffer size can reuse an existing control protocol data unit (Control PDU) for flow control feedback.

[0097] The content of the second instruction may include an available buffer size, i.e., the maximum amount of data that the parent IAB node should transmit, including the available buffer size per BAP routing ID or the available buffer size per BH RLC channel.

[0098] For example, receiving the second instruction based on the available buffer size includes receiving the second instruction based on the available buffer size and the available buffer size indicated by the information on the available buffer size being greater than a fourth threshold, that is, the execution condition is to perform the conditional reconfiguration when the available buffer size is greater than a fourth threshold.

[0099] For a second instruction based on buffer overload, the content of the second instruction may include parent IAB node buffer overload, for example, in the parent IAB node, the buffer size associated with N or M% (quantity) BAP routing IDs or BH BLC channels is greater than a fifth threshold.

[0100] For example, the execution condition is to execute the conditional reconfiguration once the second instruction is received.

[0101] In the above condition 6), the following may also be true: the quality of the PCell and / or the PSCell becomes worse than a first threshold, and the quality of one conditional reconfiguration candidate cell becomes better than a second threshold; Or, the quality of the PCell and / or the PSCell becomes worse than the first threshold by one offset, and the quality of one conditional reconfiguration candidate cell becomes better than the second threshold; Alternatively, the quality of the PCell and / or the PSCell becomes worse than the first threshold, and the quality of one conditional reconfiguration candidate cell becomes better than the second threshold by an offset; Alternatively, the quality of the PCell and / or PSCell becomes worse by one offset than the first threshold, and the quality of one conditional reconfiguration candidate cell becomes better by one offset than the second threshold.

[0102] In step 901, one first cell that satisfies the conditional resetting condition is selected as a second cell from the conditional resetting candidate cells. There may be one or at least two first cells that satisfy the above-mentioned conditional resetting condition, and different processes may be performed on each of them.

[0103] 10 is a diagram illustrating a method for implementing step 901 in the first embodiment of the present invention. As shown in FIG. 10, the method includes the following steps:

[0104] Step 1001: When a first cell satisfies the conditional reset condition, the first cell is set as the second cell; and Step 1002: When at least two first cells satisfy the conditional reset condition, one first cell is selected as the second cell.

[0105] In step 1001, when there is only one first cell among the conditional resetting candidate cells that satisfies the conditional resetting condition, the first cell is directly designated as the second cell, i.e., the cell that starts the conditional resetting execution.

[0106] In step 1002, when there are at least two primary cells among the conditional resetting candidate cells that satisfy the conditional resetting condition, one primary cell is designated as the secondary cell.

[0107] A method for selecting one first cell as the second cell in step 1002 will be specifically described below.

[0108] 11 is a diagram illustrating the method of implementing step 1002 in the first embodiment of the present invention. As shown in FIG. 11, the method includes the following steps:

[0109] Step 1101: Selecting one first cell from at least two first cells as the second cell; and / or Step 1102: The first cell that appears first or last in the stored conditional reset information is set as the second cell.

[0110] In an embodiment of the present invention, at least one of step 1101 and step 1102 can be executed, and the execution order of step 1101 and step 1102 is not limited in the embodiment of the present invention. For example, step 1101 and step 1102 may be executed in parallel or sequentially.

[0111] 12 is a diagram illustrating a method for implementing step 1101 in the first embodiment of the present invention. As shown in FIG. 12, the method includes the following steps:

[0112] Step 1201: Exclude at least one of the following cells from the at least two first cells: the cell of the parent IAB node when a radio link failure between the parent IAB node and the parent IAB node is detected; the cells of all IAB nodes connected to the parent IAB node of the parent IAB node when a radio link failure notification is received from the parent IAB node; and the cell of the parent IAB node when a second flow control instruction is received from the parent IAB node.

[0113] In an embodiment of the present invention, the radio link failure notification may include a Type-4 radio link failure notification and / or a Type-2 radio link failure notification.

[0114] In an embodiment of the present invention, for example, after performing step 1201, step 1102 in FIG. 11 may be performed, that is, after performing elimination from at least two first cells, the second cell is determined according to the order of appearance.

[0115] 13 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 13, the method includes the following steps:

[0116] Step 1301: Exclude at least one of the following cells from the at least two first cells: a cell of the parent IAB node when a radio link failure between the parent IAB node and the parent IAB node is detected; cells of all IAB nodes connected to the parent IAB node of the parent IAB node when a radio link failure notification is received from the parent IAB node; and a cell of the parent IAB node when a second flow control instruction is received from the parent IAB node; and Step 1302: From the first cells after elimination (after elimination is performed), select one first cell as the second cell based on realization.

[0117] Step 1301 is the same as step 1201, and in the method shown in FIG. 13, based on step 1301, step 1302 is further used, i.e., from the first cells after elimination, one first cell is selected as the second cell based on realization, taking into account, for example, the beam conditions and / or IAB-MT capabilities of the remaining first cells.

[0118] 14 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 14, the method includes the following steps:

[0119] Step 1401: From at least two first cells, select one first cell that satisfies at least one of the following conditions as the second cell: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0120] In an embodiment of the present invention, the radio link failure notification may include a Type-4 radio link failure notification and / or a Type-2 radio link failure notification.

[0121] In an embodiment of the present invention, for example, after selecting two or more first cells that satisfy at least one of the above conditions from at least two first cells in step 1401, step 1102 in FIG. 11 may be performed, that is, after selecting from at least two first cells, the second cells may be determined according to the order of appearance.

[0122] 15 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 15, the method includes the following steps:

[0123] Step 1501: From at least two first cells, select one first cell that satisfies at least one of the following conditions as the second cell: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0124] 16 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 16, the method includes the following steps:

[0125] Step 1601: Select one first cell that satisfies a first condition from at least two first cells based on the realization, and set it as the second cell.

[0126] The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0127] In step 1601, compared to step 1501, the first condition is satisfied, and one first cell is further selected based on the realization.

[0128] 17 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 17, the method includes the following steps:

[0129] Step 1701: From at least two first cells, a first cell that satisfies a second condition is selected as a second cell.

[0130] The second condition includes at least one of the following conditions: The first cell is a cell with the highest number of reference signals or the highest proportion of beams or reference signals whose quality is better than a fifth threshold; The first cell is the one with the best quality beam or reference signal; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0131] In an embodiment of the present invention, the quality may include at least one of RSRP of L1 layer, RSRQ of L1 layer, SINR value of L1 layer, and RSRP, RSRQ, and SINR value after filtering of layer 3.

[0132] In an embodiment of the present invention, the reference signal is, for example, SSB and / or CSR-RS.

[0133] 18 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 18, the method includes the following steps:

[0134] Step 1801: Exclude at least one of the following cells from the at least two first cells: a cell of the parent IAB node when a radio link failure between the parent IAB node and the first IAB node is detected; a cell of all IAB nodes connected to the parent IAB node of the parent IAB node when a radio link failure notification is received from the parent IAB node; and a cell of the parent IAB node when a second flow control instruction is received from the parent IAB node; and Step 1802: From the first cells after elimination, a first cell that satisfies the second condition is selected as a second cell.

[0135] The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the best quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0136] Step 1801 is the same as step 1201 and step 1301, and the specific content of the second condition in step 1802 is the same as the second condition described above.

[0137] 19 is another diagram showing the method of implementing step 1101 in embodiment 1 of the present invention. As shown in FIG. 19, the method includes the following steps:

[0138] Step 1901: One first cell that satisfies the first condition and the second condition is selected as the second cell from at least two first cells.

[0139] The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0140] The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the best quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0141] In step 1901, the specific contents of the first condition and the second condition are the same as the first condition and the second condition described above.

[0142] The above is a specific description of how to implement step 1101. However, the embodiments of the present invention are not limited to the specific implementation method described above.

[0143] Alternatively, instead of selecting one of a plurality of first cells that satisfy the conditional resetting condition as the second cell, the second cell may be determined by another method.

[0144] For example, in step 1102, the first cell that appears first or last in the stored conditional reset information is set as the second cell.

[0145] For example, the second cell is the first cell that appears first or last in the stored condRRCReconfig.

[0146] After the second cell is determined in step 901, a conditional reconfiguration execution is initiated in the second cell in step 902.

[0147] For example, in step 902, the second cell applies the selected stored settings of the second cell.

[0148] In an embodiment of the present invention, for example, the CU of the IAB donor node of the first IAB node controls the IAB-MT of the first IAB node or the IAB-MT of the child IAB node or the terminal device to apply the conditional reconfiguration method.

[0149] For example, the CU performs control according to each of the IAB-MTs or the terminal device, or the CU performs control based on a conditional resetting condition, or the CU performs control based on a conditional resetting candidate cell.

[0150] When the CU controls according to each IAB-MT or terminal device, for example, the CU configures one IAB node or terminal device to allow the execution of the conditional resetting method. In other words, when the conditional resetting condition for one target candidate cell is satisfied, the IAB-MT or terminal device starts the conditional resetting execution.

[0151] When the CU performs control based on conditional reconfiguration conditions, for example, the CU sets at least one conditional reconfiguration condition belonging to a first set of conditions for an IAB node or terminal device, and when the IAB node or the terminal device determines whether to start conditional reconfiguration execution based on the at least one conditional reconfiguration condition, allows the conditional reconfiguration method, i.e., the conditional reconfiguration method in an embodiment of the present invention, to be executed.

[0152] The first set of conditions includes at least one conditional reset condition among the above conditions 1)-4), that is, at least one of the following conditions: has detected a radio link failure on the link between its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; and A second flow control instruction is received from the parent IAB node.

[0153] For example, the CU is configured to allow execution of the conditional reconfiguration method for one IAB node or terminal device when an RLF notification is received from a parent IAB node, and in this case, for this IAB node or terminal device, the following method is executed only when the satisfied conditional reconfiguration conditions include "received an RLF notification from a parent IAB node", i.e., when the conditional reconfiguration conditions are satisfied for one target candidate cell, the IAB-MT or UE starts conditional reconfiguration execution.

[0154] When the CU performs control based on a conditional resetting candidate cell, the CU may perform control based only on the conditional resetting candidate cell, or may perform control based on the conditional resetting candidate cell and the conditional resetting condition.

[0155] In an embodiment of the present invention, the CU can perform control through RRC configuration and / or F1 configuration.

[0156] For example, when the CU performs control by RRC configuration, Determine that an IAB node or terminal device performs the conditional reconfiguration method when there is an increased selectable field of ENUMERATED type in the ConditionalReconfiguration IE; and / or When there is one selectable field of ENUMERATED type added in CondReconfigToAddMod-r16 of IE CondReconfigToAddModList, it is determined that one IAB node or terminal device will perform the conditional reconfiguration method for the corresponding target candidate cell and / or conditional reconfiguration condition.

[0157] In an embodiment of the present invention, as shown in FIG. 9, the method may further include the following steps:

[0158] Step 903: Send a measurement report or a control protocol data unit (PDU) for flow control feedback to its source parent IAB node or to the source IAB donor node of the first IAB node via the source parent IAB node.

[0159] In other words, the conditional reset decision is determined by the source parent IAB node or the source IAB donor node, i.e., the source parent IAB node or the source IAB donor node of the first IAB node determines whether to apply the conditional reset method in the embodiment of the present invention based on the received measurement report or control protocol data unit for flow control feedback.

[0160] In an embodiment of the present invention, by finalizing the conditional reset decision by the parent IAB node, the conditional reset can be set up faster, thereby further reducing the time of business interruption.

[0161] In an embodiment of the present invention, the IAB donor determines the conditional reconfiguration decision, which can take into account the overall topology situation and provide the IAB nodes with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution.

[0162] The following provides an exemplary description of the flow of the conditional reset method in the embodiment of the present invention under different scenarios.

[0163] 20 is a flowchart of a conditional reset method according to the first embodiment of the present invention. As shown in FIG. 20, the method includes the following steps:

[0164] Step 2001: Make a conditional reconfiguration decision, for example, determined by the source parent IAB node or the source IAB donor node; Step 2002: Send ConditionalReconfiguration IE; Step 2003: Perform conditional reconfiguration removal, for example, if ConditionalReconfiguration includes condReconfigToRemoveList, perform the conditional reconfiguration removal process; Step 2004: Performing conditional reconfiguration increments and / or modifications, e.g., if ConditionalReconfiguration includes condReconfigToAddModList, performing conditional reconfiguration increments and / or modifications; Step 2005: Evaluate, specifically, determine whether there is a first cell that satisfies the conditional reset condition, i.e., a trigger cell; Step 2006: When there is one first cell, start conditional reset execution in the first cell; Step 2007: When there are at least two first cells, select one from the at least two first cells as a second cell; and Step 2008: Apply the stored settings of the second cell.

[0165] In the method shown in FIG. 20, after receiving the ConditionalReconfiguration IE, evaluation is directly performed, that is, the first cell (trigger cell) is determined.

[0166] 21 is another flowchart of the conditional reset method according to the first embodiment of the present invention. As shown in FIG. 21, the method includes the following steps:

[0167] Step 2101: Make a conditional reconfiguration decision, for example, determined by the source parent IAB node or the source IAB donor node; Step 2102: Send ConditionalReconfiguration IE; Step 2103: Perform conditional reconfiguration removal, for example, if ConditionalReconfiguration includes condReconfigToRemoveList, perform the conditional reconfiguration removal process; Step 2104: Performing conditional reconfiguration increments and / or modifications, e.g., if ConditionalReconfiguration includes condReconfigToAddModList, performing the conditional reconfiguration increments and / or modifications; Step 2105: When at least one of the first set of conditions is satisfied, perform an evaluation, specifically, determine whether there is a first cell, i.e., a trigger cell, that satisfies the conditional reset condition when at least one of the first set of conditions is satisfied; Step 2106: When one first cell exists and at least one of the second set of conditions is satisfied, start conditional reset execution in the first cell; Step 2107: When there are at least two first cells and at least one in the second set of conditions is satisfied, select one from the at least two first cells as a second cell; and Step 2108: Start conditional reset execution in the second cell.

[0168] In other words, the method shown in FIG. 21 only removes, increases, and / or modifies conditional reconfiguration after receiving a ConditionalReconfiguration IE, evaluates when at least one of the first set of conditions is satisfied, i.e., determines whether a first cell (trigger cell) exists, and initiates conditional reconfiguration execution on a second cell (selected cell) determined from the first cell when at least one of the second set of conditions is satisfied.

[0169] 22 is a flowchart of a method for conditional resetting in an IAB-donor-CU transition scenario according to embodiment 1 of the present invention. As shown in FIG. 22, the method includes the following steps:

[0170] Step 2201: The source IAB donor node makes a conditional reconfiguration decision; Step 2202: The source IAB donor node sends a downlink F1 message to the source parent IAB node, which is used to carry the RRC reconfiguration message; Step 2203: The source parent IAB node sends the RRC reconfiguration message to the first IAB node, which includes information about the conditional reconfiguration; Step 2204: The first IAB node sends an RRC reconfiguration complete message to the source parent IAB node; Step 2205: The source parent IAB node sends an uplink F1 message to the source IAB donor node, which is used to carry the RRC reconfiguration complete message; Step 2206: The first IAB node selects one first cell from the conditional reconfiguration candidate cells that satisfies the conditional reconfiguration condition as a second cell, and starts performing conditional reconfiguration in the second cell; and Step 2207: The conditional reset is completed.

[0171] 23 is a flowchart of a method for conditional reconfiguration in an IAB-donor-CU transition scenario according to embodiment 1 of the present invention. As shown in FIG. 23, the method includes the following steps:

[0172] Step 2301: The source IAB donor node makes a conditional reconfiguration decision; Step 2302: The source IAB donor node sends a switch request to the target IAB donor node; Step 2303: The target IAB donor node performs admission control; Step 2304: The target IAB donor node sends a switch request confirmation to the source IAB donor node; Step 2305: The source IAB donor node sends a downlink F1 message to the source parent IAB node, which is used to carry the RRC reconfiguration message; Step 2306: The source parent IAB node sends the RRC reconfiguration message to the first IAB node, which includes information about the conditional reconfiguration; Step 2307: The first IAB node sends an RRC reconfiguration complete message to the source parent IAB node; Step 2308: The source parent IAB node sends an uplink F1 message to the source IAB donor node, which is used to carry the RRC reconfiguration complete message; Step 2309: The first IAB node selects one first cell from the conditional reconfiguration candidate cells that satisfies the conditional reconfiguration condition as a second cell, and starts performing conditional reconfiguration in the second cell; and Step 2310: Complete the conditional reset.

[0173] For specific implementation methods of each step in FIGS. 20 to 23, please refer to the previous description, and detailed explanations thereof will be omitted here.

[0174] As can be seen from the above examples, when an IAB node performs a migration, the time of business interruption can be reduced and the user experience can be improved by properly implementing a conditional reconfiguration mechanism. [Example]

[0175] In an embodiment of the present invention, a conditional resetting method is provided, which is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node. The method corresponds to the first embodiment, and reference can be made to the description of the first embodiment for the same content.

[0176] In an embodiment of the present invention, the first IAB node is a transition IAB node.

[0177] In Example 2, the second IAB node, ie, the source parent IAB node of the first IAB node, confirms the conditional reconfiguration decision.

[0178] 24 is a diagram illustrating a method for conditional resetting in embodiment 2 of the present invention. As shown in FIG. 24, the method includes the following steps:

[0179] Step 2401: Receive a control protocol data unit (PDU) for measurement report or flow control feedback; and Step 2402: Determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0180] In an embodiment of the present invention, the measurement report may be from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0181] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0182] In this embodiment, the specific contents of steps 2401 and 2402 can be referred to in the description of the first embodiment, and detailed description thereof will be omitted here.

[0183] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the parent IAB node confirm the conditional reconfiguration decision, the conditional reconfiguration can be configured more quickly, further reducing the time of business interruption. [Example]

[0184] In an embodiment of the present invention, a conditional resetting method is provided, which is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node. The method corresponds to the first embodiment, and reference can be made to the description of the first embodiment for the same content.

[0185] In an embodiment of the present invention, the first IAB node is a transition IAB node.

[0186] In embodiment 3, the source IAB donor node of the first IAB node confirms the conditional reconfiguration decision, and the second IAB node, ie, the source parent IAB node of the first IAB node, forwards the related information to the source IAB donor node.

[0187] 25 is a diagram illustrating a method for conditional resetting in embodiment 3 of the present invention. As shown in FIG. 25, the method includes the following steps:

[0188] Step 2501: Receive a control protocol data unit for measurement report or flow control feedback; and Step 2502: Send the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0189] In an embodiment of the present invention, the measurement report may be an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a measurement report from a terminal device served by the first IAB node or the child IAB node.

[0190] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0191] In an embodiment of the present invention, the measurement report or the control protocol data unit can be received via a BH link.

[0192] In an embodiment of the present invention, the measurement report or the control protocol data unit can be sent to the source IAB donor node of the first IAB node via an F1 interface.

[0193] In this embodiment, the specific contents of steps 2501 and 2502 can be referred to in the description of the first embodiment, and detailed description thereof will be omitted here.

[0194] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the IAB donor determine the conditional reconfiguration decision, the overall topology situation can be taken into account to provide the IAB node with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0195] In an embodiment of the present invention, a conditional resetting method is provided, which is used by a source IAB donor node of a first IAB node, and corresponds to the first embodiment, and reference can be made to the description of the first embodiment for the same content.

[0196] In an embodiment of the present invention, the first IAB node is a transition IAB node.

[0197] In Example 4, the source IAB donor node of the first IAB node finalizes the conditional reconfiguration decision.

[0198] 26 is a diagram illustrating a method for conditional resetting in embodiment 4 of the present invention. As shown in FIG. 26, the method includes the following steps.

[0199] Step 2601: Receive a measurement report or a control protocol data unit for flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and Step 2602: Determine a conditional reconfiguration decision based on the measurement report, or the control protocol data unit, or the downlink data transmission status protocol data unit, or the radio link failure notification.

[0200] In an embodiment of the present invention, the measurement report may be from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0201] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0202] In an embodiment of the present invention, the downlink data transmission status protocol data unit may be from the parent IAB node, or the first IAB node, or the access IAB node of the terminal device served by the child IAB node.

[0203] In an embodiment of the present invention, the radio link failure notification may be from the parent IAB node, or the first IAB node, or the access IAB node of the terminal device served by the child IAB node.

[0204] In an embodiment of the present invention, the measurement report or the control protocol data unit or the downlink data transmission status protocol data unit or the radio link failure notification can be received via an F1 interface.

[0205] In this embodiment, the specific contents of steps 2601 and 2602 can be referred to in the description of the first embodiment, and detailed description thereof will be omitted here.

[0206] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the IAB donor determine the conditional reconfiguration decision, the overall topology situation can be taken into account to provide the IAB node with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0207] In an embodiment of the present invention, a method for conditional reconfiguration is provided, which is used in a first IAB node, a child IAB node of the first IAB node, and at least one of terminal devices served by the first IAB node or the child IAB node, and a source parent IAB node of the first IAB node, i.e., a second IAB node.

[0208] In an embodiment of the present invention, the first IAB node is a transition node, and the second IAB node is a source parent IAB node of the first IAB node.

[0209] 27 is a diagram illustrating a method for conditional resetting in embodiment 5 of the present invention. As shown in FIG. 27, the method includes the following steps:

[0210] Step 2701: A first IAB node sends a control protocol data unit for measurement report or flow control feedback to a source parent IAB node; Step 2702: The source parent IAB node determines a conditional reconfiguration decision based on the measurement report or the control protocol data unit for flow control feedback; Step 2703: The source parent IAB node sends a ConditionalReconfiguration IE to the first IAB node; Step 2704: The IAB-MT of the first IAB node selects one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and Step 2705: The IAB-MT of the first IAB node initiates a conditional reconfiguration execution in the second cell.

[0211] In an embodiment of the present invention, the measurement report sent by the first IAB node to the source parent IAB node may be from the IAB-MT of the first IAB node, or from the IAB-MT of a child IAB node of the first IAB node, or from a terminal device served by the first IAB node or the child IAB node.

[0212] In an embodiment of the present invention, the control protocol data unit for flow control feedback sent by the first IAB node to the source parent IAB node may be from the IAB-MT of the first IAB node, or may be from the IAB-MT of a child IAB node of the first IAB node.

[0213] In step 2701, the measurement report or the control protocol data unit can be transmitted and received over a BH link.

[0214] In this embodiment of the present invention, the specific implementation of steps 2701 to 2704 can be referred to the description of the first embodiment, and detailed description thereof will be omitted here.

[0215] In addition, other information may also be exchanged between the IAB node, the IAB donor node and the terminal device, and the specific process may refer to the related art.

[0216] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the parent IAB node confirm the conditional reconfiguration decision, the conditional reconfiguration can be configured more quickly, further reducing the time of business interruption. [Example]

[0217] In an embodiment of the present invention, a method for conditional reconfiguration is provided, which is used in a first IAB node, a child IAB node of the first IAB node, and at least one of terminal devices served by the first IAB node or the child IAB node, a source parent IAB node of the first IAB node, i.e., a second IAB node, and a source IAB donor node.

[0218] In an embodiment of the present invention, the first IAB node is a transition node, and the second IAB node is a source parent IAB node of the first IAB node.

[0219] 28 is a diagram illustrating a method for conditional resetting in embodiment 6 of the present invention. As shown in FIG. 28, the method includes the following steps:

[0220] Step 2801: A first IAB node sends a control protocol data unit for measurement report or flow control feedback to a source parent IAB node; Step 2802: The source parent IAB node sends a control protocol data unit for the measurement report or flow control feedback to the source IAB donor node; Step 2803: The source IAB donor node determines a conditional reconfiguration decision based on the measurement report or the control protocol data unit for flow control feedback; Step 2804: The source IAB donor node sends a ConditionalReconfiguration IE to the source parent IAB node; Step 2805: The source parent IAB node sends the ConditionalReconfiguration IE to the first IAB node; Step 2806: The IAB-MT of the first IAB node selects one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and Step 2807: The IAB-MT of the first IAB node initiates a conditional reconfiguration execution in the second cell.

[0221] In an embodiment of the present invention, the measurement report sent by the first IAB node to the source parent IAB node may be from the IAB-MT of the first IAB node, or from the IAB-MT of a child IAB node of the first IAB node, or from a terminal device served by the first IAB node or the child IAB node.

[0222] In an embodiment of the present invention, the control protocol data unit for flow control feedback sent by the first IAB node to the source parent IAB node may be from the IAB-MT of the first IAB node, or may be from the IAB-MT of a child IAB node of the first IAB node.

[0223] In step 2801, the measurement report or the control protocol data unit can be transmitted and received over a BH link.

[0224] In step 2802, the measurement report or the control protocol data unit can be sent to the source IAB donor node of the first IAB node via an F1 interface.

[0225] In an embodiment of the present invention, for an intra-IAB-donor-CU (intra-CU) migration, the source IAB donor node and the target IAB donor node are the same donor node, and for an inter-IAB-donor-CU (inter-CU) migration, the source IAB donor node and the target IAB donor node are different donor nodes.

[0226] In an embodiment of the present invention, the CU of the IAB donor node of the first IAB node controls the IAB-MT of the first IAB node or the IAB-MT of the child IAB node or the terminal device to apply the conditional reconfiguration method in an embodiment of the present invention.

[0227] For example, the CU performs control according to each of the IAB-MTs or the terminal device, or the CU performs control based on a conditional resetting condition, or the CU performs control based on a conditional resetting candidate cell.

[0228] For example, the CU controlling according to each IAB-MT or terminal device includes the CU controlling to allow one IAB node or terminal device to perform the conditional reconfiguration method in an embodiment of the present invention.

[0229] For example, the CU's control based on the conditional reconfiguration condition includes: setting at least one conditional reconfiguration condition belonging to a first set of conditions for an IAB node or a terminal device; and allowing the IAB node or the terminal device to execute the conditional reconfiguration method when determining whether to start conditional reconfiguration execution based on the at least one conditional reconfiguration condition. For example, the first set of conditions includes at least one of the following conditions: detecting a radio link failure of the link to its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; and receiving a second instruction for flow control from the parent IAB node.

[0230] For example, the CU performs control through RRC configuration and / or F1 configuration.

[0231] For example, the CU's control through RRC configuration includes determining that an IAB node or terminal device will perform the conditional reconfiguration method when there is one selectable field of ENUMERATED type increased in the ConditionalReconfiguration IE; and / or determining that an IAB node or terminal device will perform the conditional reconfiguration method of an embodiment of the present invention for the corresponding target candidate cell and / or conditional reconfiguration condition when there is one selectable field of ENUMERATED type increased in CondReconfigToAddMod-r16 of the IE CondReconfigToAddModList.

[0232] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the IAB donor determine the conditional reconfiguration decision, the overall topology situation can be taken into account to provide the IAB node with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0233] In an embodiment of the present invention, an apparatus for conditional reconfiguration is provided, the apparatus being used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node, the apparatus corresponding to the method described in embodiment 1.

[0234] 29 is a diagram illustrating an apparatus for conditional resetting according to a seventh embodiment of the present invention. As shown in FIG. 29, the apparatus 2900 includes:

[0235] a first selecting unit 2901 for selecting a first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and First execution unit 2902: Used to initiate conditional reset execution in the second cell.

[0236] 30 is a diagram illustrating a first selection unit according to the seventh embodiment of the present invention. As shown in FIG. 30, the first selection unit 2901 includes:

[0237] a first determination unit 3001, used to determine a first cell as the second cell when the first cell satisfies the conditional reset condition; and A second determination unit 3002 is used to determine one first cell as the second cell when at least two first cells satisfy the conditional reset condition.

[0238] 31 is a diagram illustrating a second determination unit according to the seventh embodiment of the present invention. As shown in FIG. 31, the second determination unit 3002 includes:

[0239] A second selection unit 3101: used to select one first cell from at least two first cells as the second cell; or A third determining unit 3102 is used to determine one first cell that appears first or last in the stored conditional reset information as the second cell.

[0240] 32 is a diagram illustrating a second selection unit according to the seventh embodiment of the present invention. As shown in FIG. 32, the second selection unit 3101 includes:

[0241] A first exclusion unit 3201: used to exclude at least one of the following cells from the at least two first cells, namely, a cell of the parent IAB node when a radio link failure between the parent IAB node and the parent IAB node is detected; cells of all IAB nodes connected to the parent IAB node of the parent IAB node when a radio link failure notification is received from the parent IAB node; and a cell of the parent IAB node when a second flow control instruction is received from the parent IAB node.

[0242] As shown in FIG. 32, the second selecting unit 3101 may further include:

[0243] A third selection unit 3202 is used to select one first cell from the first cells after excluding it based on the realization as the second cell. As shown in Figure 32, instead of the third selection unit 3202, the second selection unit 3101 may further include:

[0244] A seventh selection unit 3203: selects, from the first cells after the exclusion, a first cell that satisfies the second condition as a second cell.

[0245] The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the best quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0246] 33 is another diagram of the second selection unit in the seventh embodiment of the present invention. As shown in FIG. 33, the second selection unit 3101 includes:

[0247] A fourth selection unit 3301: selects one first cell from at least two first cells that satisfies at least one of the following conditions as the second cell, namely: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0248] 34 is another diagram of the second selection unit in the seventh embodiment of the present invention. As shown in FIG. 34, the second selection unit 3101 includes:

[0249] A fifth selection unit 3401: Selecting one first cell that satisfies a first condition from at least two first cells based on the realization, as the second cell.

[0250] The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0251] 35 is another diagram of the second selection unit in the seventh embodiment of the present invention. As shown in FIG. 35, the second selection unit 3101 includes:

[0252] A sixth selection unit 3501: selects, from at least two first cells, a first cell that satisfies a second condition as a second cell.

[0253] The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or highest ratio of beams or reference signals whose quality is better than a fifth threshold; the first cell is the one with the best quality beam or reference signal; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0254] 36 is another diagram of the second selection unit in the seventh embodiment of the present invention. As shown in FIG. 36, the second selection unit 3101 includes:

[0255] An eighth selection unit 3601: selects one first cell from at least two first cells that satisfies the first condition and the second condition as the second cell.

[0256] The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of all IAB nodes connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0257] The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the best quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The average quality of the T best quality beams or reference signals on the first cell is the best.

[0258] In the embodiment of the present invention, the functions of each unit described above can be implemented by referring to the implementation methods of the relevant steps in the first embodiment, and detailed descriptions thereof will be omitted here.

[0259] As can be seen from the above examples, when an IAB node performs a migration, the time of business interruption can be reduced and the user experience can be improved by properly implementing a conditional reconfiguration mechanism. [Example]

[0260] In an embodiment of the present invention, an apparatus for conditional reconfiguration is provided, the apparatus is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node. The apparatus corresponds to the method described in Example 2.

[0261] 37 is a diagram illustrating an apparatus for conditional resetting according to an eighth embodiment of the present invention. As shown in FIG. 37, an apparatus 3700 includes:

[0262] A first receiving unit 3701: used to receive a control protocol data unit (PDU) for measurement report or flow control feedback; and A first determining unit 3702: used to determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0263] In an embodiment of the present invention, the measurement report may be from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0264] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0265] In the embodiment of the present invention, the functions of the above-mentioned units can be realized by referring to the methods for realizing the correlation steps in the second embodiment and the first embodiment, and detailed descriptions thereof will be omitted here.

[0266] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the parent IAB node confirm the conditional reconfiguration decision, the conditional reconfiguration can be configured more quickly, further reducing the time of business interruption. [Example]

[0267] In an embodiment of the present invention, an apparatus for conditional reconfiguration is provided, the apparatus is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node. The apparatus corresponds to the method described in Example 3.

[0268] 38 is a diagram illustrating an apparatus for conditional resetting according to a ninth embodiment of the present invention. As shown in FIG. 38, an apparatus 3800 includes:

[0269] A second receiving unit 3801: used to receive control protocol data units for measurement reports or flow control feedback; and A second sending unit 3802: used for sending the measurement report or the control protocol data unit to the source IAB donor node of the first IAB node.

[0270] In an embodiment of the present invention, the measurement report may be from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a measurement report of a terminal device served by the first IAB node or the child IAB node.

[0271] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0272] In an embodiment of the present invention, the measurement report or the control protocol data unit can be received via a BH link.

[0273] In an embodiment of the present invention, the measurement report or the control protocol data unit can be sent to the source IAB donor node of the first IAB node via an F1 interface.

[0274] In the embodiment of the present invention, the functions of the above-mentioned units can be realized by referring to the methods for realizing the correlation steps in the third embodiment and the first embodiment, and detailed descriptions thereof will be omitted here.

[0275] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the IAB donor determine the conditional reconfiguration decision, the overall topology situation can be taken into account to provide the IAB node with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0276] In an embodiment of the present invention, an apparatus for conditional reconfiguration is provided, which is used in a source IAB donor node of a first IAB node, and corresponds to the method described in Example 4.

[0277] 39 is a diagram illustrating an apparatus for conditional resetting according to a tenth embodiment of the present invention. As shown in FIG. 39, an apparatus 3900 includes:

[0278] A third receiving unit 3901: used for receiving a measurement report or a control protocol data unit for flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and A second determining unit 3902: used for determining a conditional reconfiguration decision based on the measurement report or the control protocol data unit or the downlink data transmission status protocol data unit or the radio link failure notification.

[0279] In an embodiment of the present invention, the measurement report may be from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0280] In an embodiment of the present invention, the control protocol data unit may be from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0281] In an embodiment of the present invention, the downlink data transmission status protocol data unit may be from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or the child IAB node.

[0282] In an embodiment of the present invention, the radio link failure notification may be from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or the child IAB node.

[0283] In an embodiment of the present invention, the measurement report or the control protocol data unit or the downlink data transmission status protocol data unit or the radio link failure notification can be received via an F1 interface.

[0284] In the embodiment of the present invention, the functions of the above-mentioned units can be realized by referring to the methods for realizing the correlation steps in the fourth embodiment and the first embodiment, and detailed descriptions thereof will be omitted here.

[0285] As can be seen from the above examples, when an IAB node performs a migration, the appropriate implementation of a conditional reconfiguration mechanism can reduce the time of business interruption and improve user experience. In addition, by having the IAB donor determine the conditional reconfiguration decision, the overall topology situation can be taken into account to provide the IAB node with better conditional reconfiguration information, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0286] In an embodiment of the present invention, a terminal device is provided, and the terminal device includes the device for conditional resetting according to the seventh embodiment.

[0287] 40 is a block diagram showing a system configuration of a terminal device according to an eleventh embodiment of the present invention. As shown in Fig. 40, a terminal device 4000 may include a processor 4010 and a memory 4020, and the memory 4020 is connected to the processor 4010. Note that this figure is merely an example, and other types of configurations may be used to supplement or replace the configuration to realize telecommunication functions or other functions.

[0288] In one implementation manner of the embodiment of the present invention, the function of the conditional resetting device can be integrated into the processor 4010. The processor 4010 may be configured to: select one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and initiate conditional resetting execution in the second cell.

[0289] In another embodiment, the conditional reset device may be configured separately from the processor 4010, for example, the conditional reset device may be configured as a chip connected to the processor 4010, and the functions of the conditional reset device may be realized under the control of the processor 4010.

[0290] As shown in Fig. 40, the terminal device 4000 may further include a communication module 4030, an input unit 4040, a display 4050, a power supply 4060, etc. Note that the terminal device 4000 does not need to include all of the components shown in Fig. 40. The terminal device 4000 may also include components not shown in Fig. 40, and in this regard, reference can be made to related techniques.

[0291] As shown in FIG. 40, the processor 4010, which may be referred to as a controller or operational control, may include a microprocessor or other processing and / or logic device, and the processor 4010 can receive inputs and control the operation of each component of the terminal device 4000.

[0292] The memory 4020 may include one or more of a buffer, flash memory, HDD, removable medium, volatile memory, non-volatile memory, or other suitable device, and may store various data and programs for information processing. The processor 4010 may execute the programs stored in the memory 4020 to store or process information. The functions of the other components are the same as those of conventional components, and therefore detailed descriptions thereof will be omitted here. Each component of the terminal device 4000 may be realized by dedicated hardware, firmware, software, or a combination thereof, all of which fall within the technical scope of the present invention.

[0293] As can be seen from the above examples, when an IAB node performs a migration, the time of business interruption can be reduced and the user experience can be improved by properly implementing a conditional reconfiguration mechanism. [Example]

[0294] In an embodiment of the present invention, a network device is provided, and the network device includes the conditional reconfiguration device according to the seventh embodiment, the eighth embodiment, the ninth embodiment, or the tenth embodiment.

[0295] Figure 41 is a block diagram showing the system configuration of a network device according to a twelfth embodiment of the present invention. As shown in Figure 41, a network device 4100 may include a processor 4110 and a memory 4120, and the memory 4120 is connected to the processor 4110. The memory 4120 can store various data and can also store an information processing program 4130, and by executing the program 4130 under the control of the processor 4110, it is possible to receive various information transmitted from a terminal device and transmit various information to a terminal device.

[0296] In one implementation, the functionality of the conditional reset device may be integrated into the processor 4110 .

[0297] Corresponding to Example 7, the processor 4110 may be configured as follows: select one first cell that satisfies the conditional resetting conditions as a second cell from the conditional resetting candidate cells; and start conditional resetting execution in the second cell.

[0298] Corresponding to Example 8, the processor 4110 may be configured as follows: receive a measurement report or a control protocol data unit (Control PDU) for flow control feedback; and determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0299] Corresponding to Example 9, the processor 4110 may be configured as follows: receive a measurement report or a control protocol data unit for flow control feedback; and transmit the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0300] Corresponding to Example 10, the processor 4110 may be configured as follows: receive a measurement report or a control protocol data unit for flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit or the downlink data transmission status protocol data unit or the radio link failure notification.

[0301] In another implementation, the conditional reset device may be located separately from the processor 4110, for example, the conditional reset device may be configured as a chip connected to the processor 4110, and the functions of the conditional reset device may be realized under the control of the processor 4110.

[0302] 41, the network device 4100 may further include a transceiver 4140 and an antenna 4150, among which the functions of the above-mentioned components are the same as those of the conventional technology, and therefore detailed description thereof will be omitted here. Note that the network device 4100 does not need to include all the components shown in Fig. 41. The network device 4100 may further include components not shown in Fig. 41, but existing technologies can be referenced for this.

[0303] As can be seen from the above examples, when an IAB node performs a migration, the time of business interruption can be reduced and the user experience can be improved by properly implementing a conditional reconfiguration mechanism.

[0304] Additionally, finalizing the conditional reconfiguration decision by the parent IAB node allows for faster configuration of the conditional reconfiguration, further reducing business disruption time.

[0305] In addition, by having the IAB donor finalize the conditional reconfiguration decision, better conditional reconfiguration information can be provided to the IAB nodes taking into account the overall topology situation, thereby improving the success rate of conditional reconfiguration execution. [Example]

[0306] In an embodiment of the present invention, a communication system is provided, and the communication system includes a terminal device according to an eleventh embodiment and / or a network device according to a twelfth embodiment.

[0307] 42 is a diagram illustrating a communication system according to a thirteenth embodiment of the present invention. As shown in FIG. 42, in the case of an inter-CU migration scenario, a communication system 4200 includes a first IAB node 4201 as a migration node, a terminal device 4202 served by the first IAB node 4201, a parent IAB node 4203 of the first IAB node 4201, a source IAB donor node 4204, and a target IAB donor node 4205.

[0308] For example, the terminal device 4202 and / or the first IAB node 4201 may include the device described in the seventh embodiment, and the parent IAB node 4203 may include the device described in the eighth embodiment.

[0309] Alternatively, for example, the terminal device 4202 and / or the first IAB node 4201 may include the device described in Example 7, the parent IAB node 4203 may include the device described in Example 9, and the source IAB donor node 4204 may include the device described in Example 10.

[0310] 43 is another diagram showing a communication system in Example 13 of the present invention. As shown in FIG. 43, in the case of an intra-CU migration scenario, the communication system 4200 includes a first IAB node 4301 as a migration node, a terminal device 4302 served by the first IAB node 4301, a parent IAB node 4303 of the first IAB node 4201, and an IAB donor node 4304.

[0311] For example, the terminal device 4302 and / or the first IAB node 4301 may include the device described in the seventh embodiment, and the parent IAB node 4303 may include the device described in the eighth embodiment.

[0312] Alternatively, for example, the terminal device 4302 and / or the first IAB node 4301 may include the device described in Example 7, the parent IAB node 4303 may include the device described in Example 9, and the IAB donor node 4304 may include the device described in Example 10.

[0313] 44 is another diagram illustrating a communication system in Example 13 of the present invention. As shown in FIG. 44, in the case of an inter-CU migration scenario, a communication system 4400 may include a first IAB node 4401 as a migration node, a terminal device 4402 served by the first IAB node 4401, a source IAB donor node 4403, and a target IAB donor node 4404.

[0314] For example, the terminal device 4402 and / or the first IAB node 4401 may include the device described in Example 7, and the source IAB donor node 4403 may include the device described in Example 10.

[0315] 45 is another diagram showing a communication system in Example 13 of the present invention. As shown in FIG. 45, in the case of an intra-CU migration scenario, the communication system 4400 includes a first IAB node 4501 as a migration node, a terminal device 4502 served by the first IAB node 4501, and an IAB donor node 4503.

[0316] For example, the terminal device 4502 and / or the first IAB node 4501 may include the device described in Example 7, and the IAB donor node 4503 may include the device described in Example 10.

[0317] Although the above describes some examples of IAB architectures to which the conditional reconfiguration method and apparatus of the present invention may be applied, they are also suitable for various other IAB architecture communication system structures.

[0318] For example, the communication system may further include a child IAB node of the first IAB node and a terminal device served by the child IAB node, and the child IAB node and / or the terminal device served by the child IAB node may include the apparatus described in Example 7.

[0319] As can be seen from the above examples, when an IAB node performs a migration, the time of business interruption can be reduced and the user experience can be improved by properly implementing a conditional reconfiguration mechanism.

[0320] The above-described apparatus and methods may be realized by software or hardware, or by a combination of hardware and software. The present invention also relates to a computer-readable program as described below, which, when executed by a logic component, causes the logic component to realize the above-described apparatus or component, or to perform the various methods or steps described above. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, or a processing unit used in a computer. The present invention also relates to a storage medium, such as a hard disk, magnetic disk, optical hard disk, DVD, or flash memory, that stores the above-described program.

[0321] Furthermore, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be further implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors communicatively coupled with a DSP, or any other configuration.

[0322] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any modifications to the present invention that do not depart from the spirit of the present invention fall within the technical scope of the present invention.

[0323] Furthermore, the following additional notes are disclosed regarding the above-described embodiments.

[0324] (Appendix 1) (Appendix 1) A conditional reset device comprising: The device is used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node; The device comprises: a first selection unit, used for selecting one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and A first execution unit adapted to initiate conditional reset execution in the second cell.

[0325] (Appendix 2) 10. The apparatus of claim 1, The conditional reset condition includes at least one of the following conditions: has detected a radio link failure on the link between its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; receiving a second indication of flow control from the parent IAB node; The quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or the PSCell, or the quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or the PSCell by one offset; The quality of the PCell and / or PSCell becomes worse than a first threshold and the quality of one conditional reconfiguration candidate cell becomes better than a second threshold; and The apparatus, wherein the quality of one conditional resetting candidate cell is better than a third threshold, or the quality of one conditional resetting candidate cell is one offset better than the third threshold.

[0326] (Appendix 3) 10. The apparatus of claim 2, receiving the radio link failure notification and / or the first indication by a BAP control PDU; or receiving the radio link failure notification and / or the first indication via a system message; or The apparatus receives the radio link failure notification and / or the first indication by a paging message.

[0327] (Appendix 4) 4. The apparatus of claim 3, The device, wherein at least one of the radio link failure notification, the first instruction, and the system message update instruction is included in a short message of a paging message and is indicated by a DCI.

[0328] (Appendix 5) 5. The apparatus according to any one of claims 2-4, The apparatus, wherein the radio link failure notification includes at least one of a Type-4 radio link failure notification, a Type-2 radio link failure notification, and a Type-3 radio link failure notification.

[0329] (Appendix 6) 10. The apparatus of claim 2, receiving a second instruction for flow control from the parent IAB node; receiving a second indication based on available buffer size or based on buffer overload.

[0330] (Appendix 7) 7. The apparatus of claim 6, The apparatus, wherein the second indication includes information representing the available buffer size and / or the parent IAB node buffer overload.

[0331] (Appendix 8) 8. The apparatus of claim 6 or 7, receiving a second indication based on the available buffer size; The apparatus includes receiving the second indication based on an available buffer size, and the available buffer size indicated by the available buffer size information being greater than a fourth threshold.

[0332] (Appendix 9) 10. The apparatus of claim 1, The first selection unit a first determination unit, used to determine a first cell as the second cell when the first cell satisfies the conditional reset condition; and and a second determination unit, adapted to determine one first cell as the second cell when at least two first cells satisfy the conditional reset condition.

[0333] (Appendix 10) 10. The apparatus of claim 9, The second determination unit: a second selection unit used to select one first cell from at least two first cells as the second cell; or The apparatus includes a third determination unit used to determine the second cell as a first cell that appears first or last in stored conditional reset information.

[0334] (Appendix 11) 11. The apparatus of claim 10, further comprising: The second selection unit a first exclusion unit, which is used to exclude at least one of the following cells from the at least two first cells: a cell of the parent IAB node when it detects a radio link failure between the parent IAB node and the parent IAB node; a cell of all IAB nodes connected to the parent IAB node of the parent IAB node when it receives a radio link failure notification from the parent IAB node; and a cell of the parent IAB node when it receives a second flow control instruction from the parent IAB node.

[0335] (Appendix 12) 12. The apparatus of claim 11, The second selection unit further comprises: The apparatus includes a third selection unit, which is used to select one first cell as the second cell from the first cells after excluding based on realization.

[0336] (Appendix 13) 11. The apparatus of claim 10, further comprising: The second selection unit and a fourth selection unit, which is used to select one first cell from the at least two first cells that satisfies at least one of the following conditions as the second cell: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0337] (Appendix 14) 11. The apparatus of claim 10, further comprising: The second selection unit a fifth selection unit, which is used to select one first cell that satisfies a first condition from the at least two first cells based on the realization, as the second cell; The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0338] (Appendix 15) 11. The apparatus of claim 10, further comprising: The second selection unit a sixth selection unit, which is used to select one first cell that satisfies the second condition from the at least two first cells as the second cell; The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; the first cell is the one with the best beam or reference signal quality; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The device has the highest average quality of the T best quality beams or reference signals on the first cell.

[0339] (Appendix 16) 12. The apparatus of claim 11, The second selection unit further comprises: a seventh selection unit, which is used to select one first cell that satisfies the second condition from the first cells after the elimination as the second cell; The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the highest quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The device has the highest average quality of the T best quality beams or reference signals on the first cell.

[0340] (Appendix 17) 11. The apparatus of claim 10, further comprising: The second selection unit an eighth selection unit, which is used to select one first cell that satisfies the first condition and the second condition from the at least two first cells as the second cell; The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and When receiving a second instruction of flow control from the parent IAB node, the first cell is not a cell of the parent IAB node, The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the highest quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and The device has the highest average quality of the T best quality beams or reference signals on the first cell.

[0341] (Appendix 18) 18. The apparatus of any one of clauses 15-17, comprising: The device, wherein the quality includes at least one of RSRP of L1 layer, RSRQ of L1 layer, SINR value of L1 layer, and RSRP, RSRQ, and SINR values ​​after layer 3 filtering.

[0342] (Appendix 19) 10. The apparatus of claim 1, The apparatus, wherein the first execution unit is used to apply, at the second cell, a stored setting of the selected second cell.

[0343] (Appendix 20) 10. The apparatus of claim 1, A device in which the CU of the IAB donor node of the first IAB node controls the IAB-MT of the first IAB node, the IAB-MT of the child IAB node, or the terminal device to apply the conditional reconfiguration device.

[0344] (Appendix 21) 21. The apparatus of claim 20, The CU performs control according to each of the IAB-MTs or the terminal devices, or The CU performs control based on a conditional reset condition, or The CU performs control based on conditional resetting candidate cells.

[0345] (Appendix 22) 22. The apparatus of claim 21, The CU performs control according to each of the IAB-MTs or the terminal device, The device includes the CU configuring one IAB node or terminal device to allow the device to perform the conditional reconfiguration.

[0346] (Appendix 23) 22. The apparatus of claim 21, The CU performs control based on a conditional reset condition, The CU sets at least one conditional reconfiguration condition belonging to a first set of conditions for an IAB node or a terminal device, and when the IAB node or the terminal device determines whether to start conditional reconfiguration execution based on the at least one conditional reconfiguration condition, allows the device to execute the conditional reconfiguration; The first set of conditions includes at least one of the following conditions: has detected a radio link failure on the link between its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; and The apparatus receives a second indication of flow control from the parent IAB node.

[0347] (Appendix 24) 21. The apparatus of claim 20, The device, wherein the CU performs control based on RRC settings and / or F1 settings.

[0348] (Appendix 25) 25. The apparatus of claim 24, The CU performs control by RRC configuration, Determine that an IAB node or terminal device performs the conditional reconfiguration when there is an increased selectable field of ENUMERATED type in the ConditionalReconfiguration IE; and / or The device includes determining that when there is one increased selectable field of ENUMERATED type in CondReconfigToAddMod-r16 of IE CondReconfigToAddModList, one IAB node or terminal device will perform the conditional reconfiguration device for the corresponding target candidate cell and / or conditional reconfiguration condition.

[0349] (Appendix 26) 25. The apparatus of any one of clauses 1-24, comprising: The apparatus further comprises: An apparatus comprising: a first transmitting unit, which is used to transmit a control protocol data unit (Control PDU) for flow control feedback to its source parent IAB node or to a source IAB donor node of the first IAB node via the source parent IAB node.

[0350] (Appendix 27) 27. The apparatus of claim 26, The conditional reconfiguration decision is determined by the source parent IAB node or the source IAB donor node.

[0351] (Appendix 28) 28. The apparatus of any one of clauses 1-27, comprising: The device, wherein the conditional resetting includes a conditional switch-on-hold (CHO) or a conditional PScell ​​change.

[0352] (Appendix 29) 29. The apparatus of any one of clauses 1-28, comprising: The conditional reset candidate cell is an applicable cell.

[0353] (Appendix 30) 30. The apparatus of any one of clauses 1-29, comprising: The apparatus, wherein the conditional reset candidate cells include conditional handover (CHO) candidate cells and / or conditional PSCell change candidate cells.

[0354] (Appendix 31) A conditional reset device comprising: The device is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node; The device comprises: a first receiving unit, used for receiving a measurement report or a control protocol data unit (PDU) for flow control feedback; and An apparatus comprising: a first determination unit adapted to determine a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0355] (Appendix 32) 32. The apparatus of claim 31, The measurement report is from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0356] (Appendix 33) 32. The apparatus of claim 31, The device, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0357] (Appendix 34) A conditional reset device comprising: The device is used in a second IAB node, and the second IAB node is a source parent IAB node of the first IAB node; The device comprises: a second receiving unit used to receive control protocol data units for measurement reports or flow control feedback; and An apparatus comprising: a second transmitting unit adapted to transmit the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0358] (Appendix 35) 35. The apparatus of claim 34, The measurement report is from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a measurement report of a terminal device served by the first IAB node or the child IAB node.

[0359] (Appendix 36) 35. The apparatus of claim 34, The device, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0360] (Appendix 37) 37. The apparatus of any one of clauses 31-36, comprising: The measurement report or the control protocol data unit is received via a BH link.

[0361] (Appendix 38) 38. The apparatus of any one of clauses 34-37, comprising: The measurement report or the control protocol data unit is transmitted to a source IAB donor node of the first IAB node via an F1 interface.

[0362] (Appendix 39) A conditional reset device comprising: The device is used as a source IAB donor node of a first IAB node; The device comprises: a third receiving unit, used for receiving a measurement report or a control protocol data unit for flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and The apparatus includes a second determination unit, the second determination unit being used to determine a conditional reconfiguration decision based on the measurement report, the control protocol data unit, the downlink data transmission status protocol data unit, or the radio link failure notification.

[0363] (Appendix 40) 39. The apparatus of claim 39, The measurement report is from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0364] (Appendix 41) 39. The apparatus of claim 39, The device, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0365] (Appendix 42) 39. The apparatus of claim 39, The downlink data transmission status protocol data unit is from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or served by a child IAB node of the first IAB node.

[0366] (Appendix 43) 39. The apparatus of claim 39, The device, wherein the radio link failure notification is from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or served by a child IAB node of the first IAB node.

[0367] (Appendix 44) 44. The apparatus of any one of clauses 39-43, comprising: The measurement report, the control protocol data unit, the downlink data transmission status protocol data unit, or the radio link failure notification is received via an F1 interface.

[0368] (Appendix 45) A terminal device, The terminal device may include a device according to any one of appendices 1-33.

[0369] (Appendix 46) A network device, The network device is a first IAB node or a child IAB node of the first IAB node, and the network device includes a device described in any one of Supplementary Notes 1-33.

[0370] (Appendix 47) A network device, The network device is a second IAB node, the second IAB node is a source parent IAB node of a first IAB node, and the network device includes a device described in any one of Supplementary Notes 31-33.

[0371] (Appendix 48) A network device, The network device is a second IAB node, the second IAB node is a source parent IAB node of a first IAB node, and the network device includes a device described in any one of Appendixes 34-38.

[0372] (Appendix 49) A network device, The network device is a source IAB donor node of a first IAB node, and the network device comprises a device described in any one of Supplementary Notes 39-44.

[0373] (Appendix 50) 1. A communication system comprising: 48. A communication system comprising at least one of a terminal device according to claim 45, a network device according to claim 46, and a network device according to claim 47.

[0374] (Appendix 51) 1. A communication system comprising: 46. ​​A communication system comprising at least one of a terminal device according to claim 45, a network device according to claim 46, a network device according to claim 48, and a network device according to claim 49.

[0375] (Appendix 2) (Appendix 1) 1. A method of conditional resetting, comprising: The method is used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node; The method comprises: Selecting one first cell that satisfies the conditional resetting condition as a second cell from the conditional resetting candidate cells; and initiating a conditional reset execution at the second cell.

[0376] (Appendix 2) 2. The method of claim 1, comprising: The conditional reset condition includes at least one of the following conditions: has detected a radio link failure on the link between its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; receiving a second indication of flow control from the parent IAB node; The quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or the PSCell, or the quality of one conditional reconfiguration candidate cell becomes better than the PCell and / or the PSCell by one offset; The quality of the PCell and / or PSCell becomes worse than a first threshold and the quality of one conditional reconfiguration candidate cell becomes better than a second threshold; and The method wherein the quality of one conditional reset candidate cell becomes better than a third threshold, or the quality of one conditional reset candidate cell becomes one offset better than the third threshold.

[0377] (Appendix 3) 10. The method of claim 2, receiving the radio link failure notification and / or the first instruction by a BAP control PDU; receiving the radio link failure notification and / or the first indication via a system message; or receiving the radio link failure notification and / or the first indication via a paging message.

[0378] (Appendix 4) 4. The method of claim 3, A method in which at least one of the radio link failure notification, the first instruction, and the system message update instruction is included in a short message of a paging message and is indicated by a DCI.

[0379] (Appendix 5) 1. The method according to any one of appendices 2-4, comprising: The method, wherein the radio link failure notification includes at least one of a Type-4 radio link failure notification, a Type-2 radio link failure notification, and a Type-3 radio link failure notification.

[0380] (Appendix 6) 10. The method of claim 2, receiving a second instruction for flow control from the parent IAB node; receiving a second indication based on available buffer size or based on buffer overload.

[0381] (Appendix 7) 7. The method of claim 6, The method, wherein the second indication includes information representing the available buffer size and / or the parent IAB node buffer overload.

[0382] (Appendix 8) 8. The method according to claim 6 or 7, receiving a second indication based on the available buffer size; receiving the second indication based on an available buffer size, and the available buffer size indicated by the available buffer size information being greater than a fourth threshold.

[0383] (Appendix 9) 2. The method of claim 1, comprising: Selecting one first cell that satisfies a conditional resetting condition from the conditional resetting candidate cells as a second cell includes: When one first cell satisfies the conditional reset condition, the first cell is set as the second cell; and determining one first cell as the second cell when at least two first cells satisfy the conditional reset condition.

[0384] (Appendix 10) 10. The method of claim 9, determining the one first cell as the second cell, selecting one first cell from at least two first cells as the second cell; or The method includes determining as the second cell one first cell that appears first or last in stored conditional reset information.

[0385] (Appendix 11) 11. The method of claim 10, Selecting one first cell from the at least two first cells as the second cell includes: The method includes excluding at least one of the following cells from the at least two first cells: a cell of the parent IAB node when a radio link failure between the parent IAB node and the parent IAB node is detected; cells of all IAB nodes connected to a parent IAB node of the parent IAB node when a radio link failure notification is received from the parent IAB node; and a cell of the parent IAB node when a second flow control instruction is received from the parent IAB node.

[0386] (Appendix 12) 12. The method of claim 11, Selecting one first cell from the at least two first cells as the second cell further includes: selecting one first cell as the second cell from the eliminated first cells based on realization.

[0387] (Appendix 13) 11. The method of claim 10, Selecting one first cell from the at least two first cells as the second cell includes: Selecting one first cell from at least two first cells that satisfies at least one of the following conditions as the second cell, namely: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and The method, wherein upon receiving a second flow control indication from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0388] (Appendix 14) 11. The method of claim 10, Selecting one first cell from the at least two first cells as the second cell includes: selecting one first cell that satisfies a first condition from the at least two first cells based on realization as the second cell; The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and The method, wherein upon receiving a second flow control indication from the parent IAB node, the first cell is not a cell of the parent IAB node.

[0389] (Appendix 15) 11. The method of claim 10, Selecting one first cell from the at least two first cells as the second cell includes: is used to select one first cell that satisfies a second condition from at least two first cells as the second cell; The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; the first cell is the one with the best beam or reference signal quality; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and A method in which the average quality of the T best quality beams or reference signals on the first cell is the best.

[0390] (Appendix 16) 12. The method of claim 11, Selecting one first cell from the at least two first cells as the second cell further includes: selecting one first cell that satisfies the second condition from the first cells after the elimination as the second cell; The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the highest quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and A method in which the average quality of the T best quality beams or reference signals on the first cell is the best.

[0391] (Appendix 17) 11. The method of claim 10, Selecting one first cell from the at least two first cells as the second cell includes: selecting one first cell that satisfies a first condition and a second condition from at least two first cells as the second cell; The first condition includes at least one of the following conditions: When detecting a radio link failure between the first cell and its parent IAB node, the first cell is not the cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node of the parent IAB node; and When receiving a second instruction of flow control from the parent IAB node, the first cell is not a cell of the parent IAB node, The second condition includes at least one of the following conditions: The first cell is a cell having the largest number or the highest ratio of beams or reference signals whose quality is better than a fifth threshold; The first cell is a cell to which the beam or reference signal with the highest quality belongs; The first cell is the cell with the largest number or highest proportion of beams or reference signals in the previous S best quality beams or reference signals; and A method in which the average quality of the T best quality beams or reference signals on the first cell is the best.

[0392] (Appendix 18) 18. The method according to any one of claims 15-17, comprising: The method, wherein the quality includes at least one of RSRP of L1 layer, RSRQ of L1 layer, SINR value of L1 layer, and RSRP, RSRQ, and SINR values ​​after layer 3 filtering.

[0393] (Appendix 19) 2. The method of claim 1, comprising: Initiating conditional reset execution at the second cell includes: applying, at the second cell, the stored settings of the selected second cell.

[0394] (Appendix 20) 2. The method of claim 1, comprising: A method in which a CU of an IAB donor node of the first IAB node controls an IAB-MT of the first IAB node, an IAB-MT of the child IAB node, or the terminal device to apply the conditional reconfiguration method.

[0395] (Appendix 21) 21. The method of claim 20, The CU performs control according to each of the IAB-MTs or the terminal devices, or The CU performs control based on a conditional reset condition, or The CU performs control based on conditional resetting candidate cells.

[0396] (Appendix 22) 22. The method of claim 21, The CU performs control according to each of the IAB-MTs or the terminal device, The CU configures one IAB node or terminal device to allow execution of the conditional reconfiguration method.

[0397] (Appendix 23) 22. The method of claim 21, The CU performs control based on a conditional reset condition, The CU sets at least one conditional reconfiguration condition belonging to a first set of conditions for an IAB node or a terminal device, and allows the IAB node or the terminal device to execute the conditional reconfiguration method when determining whether to start conditional reconfiguration execution based on the at least one conditional reconfiguration condition; The first set of conditions includes at least one of the following conditions: has detected a radio link failure on the link between its parent IAB node; receiving a radio link failure notification from the parent IAB node; receiving a first instruction from the parent IAB node to trigger a conditional reconfiguration; and receiving a second indication of flow control from the parent IAB node.

[0398] (Appendix 24) 21. The method of claim 20, A method in which the CU performs control through RRC configuration and / or F1 configuration.

[0399] (Appendix 25) 25. The method of claim 24, The CU performs control by RRC configuration, When there is an increased selectable field of type ENUMERATED in the ConditionalReconfiguration IE, one IAB node or terminal device determines to perform the conditional reconfiguration method; and / or A method comprising determining that when there is one increased selectable field of ENUMERATED type in CondReconfigToAddMod-r16 of IE CondReconfigToAddModList, one IAB node or terminal device will perform the conditional reconfiguration method for the corresponding target candidate cell and / or conditional reconfiguration condition.

[0400] (Appendix 26) The method of any one of claims 1-24, further comprising: transmitting a control protocol data unit (PDU) for flow control feedback to the source parent IAB node or to a source IAB donor node of the first IAB node via the source parent IAB node.

[0401] (Appendix 27) 27. The method of claim 26, The method, wherein the conditional reset decision is determined by the source parent IAB node or the source IAB donor node.

[0402] (Appendix 28) 28. The method according to any one of claims 1-27, comprising: The method, wherein the conditional resetting includes a conditional switch-over (CHO) or a conditional PScell ​​change.

[0403] (Appendix 29) 29. The method of any one of claims 1-28, comprising: The conditional reset candidate cell is an applicable cell.

[0404] (Appendix 30) 29. The method of claim 1, further comprising: The method, wherein the conditional reset candidate cells include conditional switchover (CHO) candidate cells and / or conditional PSCell change candidate cells.

[0405] (Appendix 31) 1. A method of conditional resetting, comprising: The method is used on a second IAB node, the second IAB node being a source parent IAB node of the first IAB node; The method comprises: Receive a control protocol data unit (PDU) for measurement report or flow control feedback; and determining a conditional reconfiguration decision based on the measurement report or the control protocol data unit.

[0406] (Appendix 32) 32. The method of claim 31, The method, wherein the measurement report is from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0407] (Appendix 33) 32. The method of claim 31, The method, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0408] (Appendix 34) 1. A method of conditional resetting, comprising: The method is used on a second IAB node, the second IAB node being a source parent IAB node of the first IAB node; The method comprises: receiving a control protocol data unit for measurement reporting or flow control feedback; and transmitting the measurement report or the control protocol data unit to a source IAB donor node of the first IAB node.

[0409] (Appendix 35) 35. The method of claim 34, A method in which the measurement report is an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a measurement report from a terminal device served by the first IAB node or the child IAB node.

[0410] (Appendix 36) 35. The method of claim 34, The method, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0411] (Appendix 37) 37. The method according to any one of claims 31-36, comprising: The method, wherein the measurement report or the control protocol data unit is received over a bridge hand (BH) link.

[0412] (Appendix 38) 38. The method according to any one of claims 34-37, comprising: The measurement report or the control protocol data unit is transmitted to a source IAB donor node of the first IAB node via an F1 interface.

[0413] (Appendix 39) 1. A method of conditional resetting, comprising: The method is used by a source IAB donor node of a first IAB node, The method comprises: receiving a control protocol data unit for measurement reports or flow control feedback or a downlink data transmission status protocol data unit or a radio link failure notification; and determining a conditional reconfiguration decision based on the measurement report or the control protocol data unit or the downlink data transmission status protocol data unit or the radio link failure notification.

[0414] (Appendix 40) 39. The method of claim 39, The method, wherein the measurement report is from an IAB-MT of a first IAB node, an IAB-MT of a child IAB node of the first IAB node, or a terminal device served by the first IAB node or the child IAB node.

[0415] (Appendix 41) 39. The method of claim 39, The method, wherein the control protocol data unit is from an IAB-MT of a first IAB node or an IAB-MT of a child IAB node of the first IAB node.

[0416] (Appendix 42) 39. The method of claim 39, A method in which the downlink data transmission status protocol data unit is from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or served by a child IAB node of the first IAB node.

[0417] (Appendix 43) 39. The method of claim 39, The method, wherein the radio link failure notification is from a parent IAB node of the first IAB node or an access IAB node of a terminal device served by the first IAB node or served by a child IAB node of the first IAB node.

[0418] (Appendix 44) 39-43, comprising: The method, wherein the measurement report, the control protocol data unit, the downlink data transmission status protocol data unit, or the radio link failure notification is received via an F1 interface.

Claims

1. A conditional reset device comprising: the device is used in at least one of a first IAB node, a child IAB node of the first IAB node, and a terminal device served by the first IAB node or the child IAB node; The device a memory; and a processor coupled to the memory; The processor includes: Selecting one first cell from the conditional reset candidate cells as a second cell when a conditional reset condition is satisfied; and configured to initiate a conditional reset execution at the second cell; The conditional reset condition is: If the apparatus is applicable to the first IAB node or the terminal device served by the first IAB node, detecting a radio link failure of a link between the first IAB node and a parent IAB node of the first IAB node; Detecting a radio link failure of a link between a child IAB node of the first IAB node and the first IAB node, when the apparatus is applicable to a child IAB node of the first IAB node and the terminal device served by the child IAB node; receiving a radio link failure notification from the parent IAB node; The quality of one conditional reconfiguration candidate cell is better than the PCell and / or the PSCell by an offset; The quality of the PCell and / or the PSCell becomes worse than a first threshold, and the quality of one conditional reconfiguration candidate cell becomes better than a second threshold; and The quality of one conditional reconfiguration candidate cell becomes better than the third threshold. and receiving the radio link failure notification via a BAP control PDU; receiving the radio link failure notification via a system message; or receiving the radio link failure notification by a paging message; The apparatus, wherein at least one of the radio link failure notification and the system message update instruction is included in a short message of the paging message and is indicated by a DCI.

2. 10. The apparatus of claim 1, The apparatus, wherein the radio link failure notification includes at least one of a Type-4 radio link failure notification, a Type-2 radio link failure notification, and a Type-3 radio link failure notification.

3. 10. The apparatus of claim 1, The processor further comprises: If the conditional reset condition is satisfied, one first cell is the second cell; and The apparatus is configured to determine one first cell of at least two first cells as the second cell if the conditional reset condition is satisfied.

4. 4. The apparatus of claim 3, The processor further comprises: selecting one first cell from at least two first cells as the second cell; or The device is configured to set one first cell that appears first or last in stored conditional reset information as the second cell.

5. 5. The apparatus of claim 4, the processor is further configured to select one first cell that satisfies a first condition from the at least two first cells as the second cell; The first condition is: When detecting a radio link failure between the first IAB node or the child IAB node and a parent IAB node, the first cell is not a cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node. The device includes at least one of the following conditions:

6. 5. The apparatus of claim 4, the processor is further configured to select, from the at least two first cells, one first cell that satisfies a second condition as the second cell; The second condition is: The first cell is a cell having the largest number or highest percentage of reference signals whose quality is better than a fifth threshold; The first cell is a cell with the best reference signal quality; The first cell is the cell having the largest number or highest proportion of reference signals among the S best quality reference signals; and The first cell is the cell with the best average quality of the T reference signals with the best quality. The device includes at least one of the following conditions:

7. 5. The apparatus of claim 4, the processor is further configured to select one first cell that satisfies a first condition and a second condition from the at least two first cells, as the second cell; The first condition is: When detecting a radio link failure between the first IAB node or the child IAB node and a parent IAB node, the first cell is not a cell of the parent IAB node; When receiving a radio link failure notification from the parent IAB node, the first cell is not a cell of any IAB node connected to the parent IAB node; and When a second flow control instruction is received from the parent IAB node, the first cell is not a cell of the parent IAB node. and The second condition is: The first cell is a cell having the largest number or highest percentage of reference signals whose quality is better than a fifth threshold; The first cell is a cell with the best reference signal quality; The first cell is the cell having the largest number or highest proportion of reference signals among the S best quality reference signals; and The first cell is the cell with the best average quality of the T reference signals with the best quality. The device includes at least one of the following conditions:

8. 10. The apparatus of claim 1, The apparatus, wherein the processor is further configured to apply the stored second cell settings to the selected second cell.

9. 10. The apparatus of claim 1, The apparatus, wherein the conditional reset candidate cell includes a conditional handover (CHO) candidate cell and / or a conditional PSCell change candidate cell.

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