Mobility management method and equipment for layer 1 / 2 triggering in wireless communication

Abstract

Disclosed are a method and device for mobility management for layer 1-layer 2 triggering in wireless communication, comprising: receiving at least one candidate configuration, any one of the at least one candidate configuration comprising an RRC reconfiguration message; the method comprises the following steps: receiving a first signaling, wherein the first signaling is an MAC CE; the first signaling indicates a first candidate configuration in the at least one candidate configuration; in response to receiving the first signaling, it is determined that a non-RACH LTM cell handover is being performed at an MAC sub-layer, and the first candidate configuration is applied at an RRC sub-layer, where the application of the first candidate configuration at the RRC sub-layer comprises: starting a first timer, the first timer being a timer of the RRC sub-layer; determining that the switching of the LTM cell of the non-RACH is not carried out at the MAC sub-layer; according to the method and the device, LTM cell switching can be better supported, more power is saved, misoperation can be avoided, and pilot frequency measurement can be more accurately carried out.

Description

Technical Field

[0001] The present application relates to a method for layer 1 and layer 2 triggered mobility management in a cellular wireless communication system, and in particular to a method for layer 1 and layer 2 triggered mobility management of non-RACH. Background Art

[0002] In the future, the application scenarios of wireless communication systems will become more and more diversified, and different application scenarios will put forward different performance requirements for the system. In order to meet the different performance requirements of various application scenarios, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #72 plenary meeting decided to study the new radio (NR) (or Fifth Generation, 5G) technology, and the NR WI (Work Item) was passed at the 3GPP RAN #75 plenary meeting, and the standardization work on NR began.

[0003] In communication, both LTE (Long Term Evolution) and 5G NR involve accurate reception of reliable information, optimized energy efficiency, determination of information validity, flexible resource allocation, scalable system structure, efficient non-access layer information processing, low service interruption and drop rate, and support for low power consumption. This is of great significance to the normal communication between base stations and user equipment, the reasonable scheduling of resources, and the balancing of system loads. It can be said to be the cornerstone of high throughput, meeting the communication needs of various services, improving spectrum utilization, and improving service quality. It is indispensable for eMBB (ehanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication) and eMTC (enhanced Machine Type Communication). At the same time, in IIoT (Industrial Internet of Things), V2X (Vehicular to X), device to device, unlicensed spectrum communication, user communication quality monitoring, network planning and optimization, TN (Territial Network), dual connectivity system, wireless resource management and multi-antenna codebook selection, signaling design, neighbor management, business management, and beamforming, there are extensive demands. Information transmission methods are divided into broadcast and unicast. Both transmission methods are essential for 5G systems because they are very helpful in meeting the above requirements.

[0004] As the scenarios and complexity of the system continue to increase, higher requirements are placed on reducing interruption rates, reducing latency, enhancing reliability, enhancing system stability, business flexibility, and power saving. At the same time, compatibility between different versions of different systems also needs to be considered during system design. Summary of the invention

[0005] Researchers have found that LTM (L1 / L2 Triggered Mobility) cell switch has significant technical progress compared to traditional cell switch based on layer 3, which can greatly shorten the switching delay and better ensure the continuity of data transmission. The reason why LTM cell switch can achieve the above technical progress is that it adopts the combination of layer 1 / layer 2 and layer 3. For many years since the birth of mobile communications, the network only supports cell switch based on layer 3, which shows that it is very technically challenging to support cell switch based on the combination of layer 1 / layer 2 and layer 3. One of these technical challenges is that the RRC sublayer and the MAC sublayer need close and smooth interaction and collaboration, and different sublayers in communication are often relatively independent in implementation, which is conducive to reducing the complexity of implementation. Therefore, whether it is layer 1 / layer 2 or layer 3, more enhancements are needed to support LTM and achieve the above technical effects. It should be noted that these enhancements are not intended to destroy the relative independence of the MAC sublayer and the RRC sublayer. Researchers found that the MAC sublayer determines whether a non-RACH LTM cell handover is in progress, which has many impacts on the terminal, such as determining whether to monitor the PDCCH in the measurement gap. Unnecessary monitoring of the PDCCH will lead to waste of power. Therefore, how the MAC sublayer determines that a non-RACH LTM cell handover is not in progress is a problem that needs to be solved.

[0006] In view of the above-mentioned problems, this application provides a solution.

[0007] It should be noted that, in the absence of conflict, the embodiments and features in any node of the present application can be applied to any other node. In the absence of conflict, the embodiments and features in the embodiments of the present application can be arbitrarily combined with each other. At the same time, the method proposed in the present application can also be used to solve other problems in communication, such as NR evolution and problems in 6G systems.

[0008] As an embodiment, the interpretation of the terminology in the present application refers to the definition of the 3GPP specification protocol TS38 series.

[0009] As an example, the interpretation of the terms in the present application refers to the definitions of the TS37 series of specification protocols of 3GPP.

[0010] The present application discloses a method in a first node used for wireless communication, comprising:

[0011] Receiving at least one candidate configuration, any candidate configuration of the at least one candidate configuration includes an RRC reconfiguration message; receiving a first signaling, the first signaling being a MAC CE (control element); the first signaling indicating a first candidate configuration of the at least one candidate configuration; as a response to receiving the first signaling, determining at the MAC sublayer that a non-RACH (random access channel) LTM cell handover is in progress, applying the first candidate configuration at the RRC sublayer, wherein the applying the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer being a timer of the RRC sublayer; determining at the MAC sublayer that the non-RACH LTM cell handover is not in progress;

[0012] Among them, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; and monitoring PDCCH within a measurement gap that the non-RACH LTM cell switching is in progress.

[0013] As an embodiment, the problems to be solved by the present application include: how the MAC sublayer determines that the non-RACH LTM cell switching is not in progress, especially how the MAC sublayer determines that the non-RACH LTM cell switching is not in progress when no uplink grant is received before the first timer expires.

[0014] As an embodiment, the benefits of the above method include: more power saving, avoiding misoperation, avoiding misunderstandings between the terminal and the network, ensuring data transmission during LTM cell switching, better support for LTM cell switching, better support for measurement, better support for configured uplink granting; more accurate indication of SSB index to lower layers, and more accurate indication of TCI (transmission configuration indication) status to lower layers.

[0015] Specifically, according to one aspect of the present application, determining at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depending on the expiration of the first timer includes: the RRC sublayer of the first node explicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0016] Specifically, according to one aspect of the present application, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depends on the expiration of the first timer, including: the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0017] Specifically, according to one aspect of the present application, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, and the MAC sublayer reset of the first node includes determining that the non-RACH LTM cell switching is not in progress.

[0018] Specifically, according to one aspect of the present application, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, the MAC sublayer reset of the first node triggers the expiration of the timing advance timer, and the expiration of the timing advance timer triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress.

[0019] Specifically, according to one aspect of the present application, as a response to the expiration of the first timer, RRC connection reconstruction is initiated, which includes applying the first candidate configuration; accompanied by the application of the first candidate configuration, performing RACH-based LTM cell switching.

[0020] Specifically, according to one aspect of the present application, during the active time of the MAC sublayer, PDCCH (physical downlink control channel) is monitored;

[0021] The active time of the MAC sublayer includes the time when non-RACH LTM cell switching is in progress.

[0022] Specifically, according to one aspect of the present application, expiration of the first timer triggers the MAC sublayer to determine that UE-based timing advance measurement is not configured.

[0023] Specifically, according to one aspect of the present application, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates first configuration information to the MAC sublayer, and the first configuration information triggers the MAC sublayer to determine that the non-RACH LTM cell switching is not in progress.

[0024] Specifically, according to one aspect of the present application, the first node is an Internet of Things terminal.

[0025] Specifically, according to one aspect of the present application, the first node is a user equipment.

[0026] Specifically, according to one aspect of the present application, the first node is a vehicle-mounted terminal.

[0027] Specifically, according to one aspect of the present application, the first node is a mobile phone.

[0028] The present application discloses a first node used in wireless communication, comprising:

[0029] A first processor receives at least one candidate configuration, any candidate configuration in the at least one candidate configuration includes an RRC reconfiguration message; receives a first signaling, the first signaling is a MAC CE; the first signaling indicates a first candidate configuration in the at least one candidate configuration; as a response to receiving the first signaling, determines at the MAC sublayer that a non-RACH LTM cell handover is in progress, and applies the first candidate configuration at the RRC sublayer, wherein the applying the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer is a timer of the RRC sublayer; and determines at the MAC sublayer that the non-RACH LTM cell handover is not in progress;

[0030] Among them, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; and monitoring PDCCH within a measurement gap that the non-RACH LTM cell switching is in progress.

[0031] As an embodiment, compared with the traditional solution, this application has the following advantages:

[0032] The main difference between non-RACH LTM cell switching and RACH-based LTM cell switching is that non-RACH LTM does not use and does not require the RACH process, which is conducive to further shortening the delay of LTM cell switching; RACH-based LTM cell switching requires the RACH process.

[0033] One of the main differences between non-RACH LTM cell handover and RACH-based LTM cell handover is that in non-RACH LTM cell handover, it is difficult for the MAC sublayer to accurately determine whether the non-RACH LTM cell handover has failed or has not been successfully completed.

[0034] Through the method proposed in the present application, the MAC sublayer can better and more accurately determine that the non-RACH LTM cell switching is no longer in progress.

[0035] Furthermore, it is helpful to avoid the MAC sublayer always believing that non-RACH LTM cell switching is in progress, which is helpful to avoid misoperation and misunderstanding between the terminal and the network.

[0036] It helps save power, ensure data transmission, avoid data interruption, and ensure successful LTM recovery.

[0037] This is conducive to obtaining more accurate measurement results.

[0038] This is conducive to better support of HARQ (Hybrid Automatic Repeat Request) transmission and more accurate indication of TCI and SSB index. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0040] Figure 1 A schematic diagram showing receiving at least one candidate configuration, receiving a first signaling, determining at a MAC sublayer that a non-RACH LTM cell handover is in progress, applying a first candidate configuration at an RRC sublayer, and determining at a MAC sublayer that a non-RACH LTM cell handover is not in progress according to an embodiment of the present application is shown;

[0041] Figure 2 A schematic diagram of a network architecture according to an embodiment of the present application is shown;

[0042] Figure 3 A schematic diagram showing an embodiment of a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram showing a first communication device and a second communication device according to an embodiment of the present application is shown;

[0044] Figure 5 A flow chart showing wireless signal transmission according to an embodiment of the present application is shown;

[0045] Figure 6 A flow chart showing the interaction between the MAC sublayer and the RRC sublayer according to an embodiment of the present application is shown;

[0046] Figure 7 A schematic diagram showing a first signaling according to an embodiment of the present application is shown;

[0047] Figure 8 A schematic diagram showing a non-RACH-dependent LTM cell switching monitoring PDCCH in a measurement gap according to an embodiment of the present application is in progress;

[0048] Fig. 9 A schematic diagram showing that the first configuration information triggers the MAC sublayer to determine that non-RACH LTM cell switching is not in progress according to an embodiment of the present application;

[0049] Fig.10The following is a schematic diagram illustrating a processing device used in a first node according to an embodiment of the present application. Implementation

[0051] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0052] Example 1

[0053] Embodiment 1 illustrates a flowchart of receiving at least one candidate configuration, receiving a first signaling, determining at the MAC sublayer that a non-RACH LTM cell handover is in progress, applying the first candidate configuration at the RRC sublayer, and determining at the MAC sublayer that a non-RACH LTM cell handover is not in progress according to an embodiment of the present application, as shown in the attached Figure 1 Attached Figure 1 In the figure, each box represents a step. It should be emphasized that the order of the boxes in the figure does not represent the temporal relationship between the steps represented.

[0054] In Embodiment 1, the first node in the present application receives at least one candidate configuration in step 101, receives first signaling in step 102, determines at the MAC sublayer that non-RACH LTM cell switching is in progress in step 103, applies the first candidate configuration at the RRC sublayer in step 104, and determines at the MAC sublayer that non-RACH LTM cell switching is not in progress in step 105;

[0055] Among them, any candidate configuration of the at least one candidate configuration includes an RRC reconfiguration message; the first signaling is a MAC CE; the first signaling indicates a first candidate configuration of the at least one candidate configuration; as a response to receiving the first signaling, the determination that the non-RACH LTM cell switching is in progress is performed at the MAC sublayer, and the application of the first candidate configuration is performed at the RRC sublayer, wherein the application of the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer is a timer of the RRC sublayer; the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes synchronous reconfiguration for a special cell of the first node; whether to monitor PDCCH within the measurement gap depends on whether the non-RACH LTM cell switching is in progress.

[0056] As an embodiment, the first node is a UE (User Equipment).

[0057] As an embodiment, the first node is a terminal.

[0058] As an embodiment, LTM cell switch is a cell switch triggered by L1 / L2 signaling.

[0059] As an embodiment, any operation performed in the MAC sublayer may also be understood or referred to as any operation performed by the MAC entity.

[0060] As an embodiment, the lower layer at which the MAC sublayer performs operations is the physical layer.

[0061] As an embodiment, the higher layers when the MAC sublayer performs operations include the RLC sublayer, the RRC sublayer, and the PDCP sublayer.

[0062] Typically, the higher layer at which the MAC sublayer performs operations is the RRC sublayer.

[0063] As an embodiment, the lower layers when the RRC sublayer performs operations include the physical layer, the MAC layer, the RLC sublayer, and the PDCP sublayer.

[0064] As an embodiment, the higher layer when the RRC sublayer performs an operation includes a non-access stratum.

[0065] As an embodiment, the higher layer signaling refers to RRC signaling or non-access stratum.

[0066] As an embodiment, in the present application, if it is not specifically stated that it is executed in the MAC sublayer, it is executed in the RRC sublayer.

[0067] As an embodiment, access layer security of the first node is activated.

[0068] As an embodiment, the access stratum (AS) includes multiple protocol layers, and the details can be referred to Embodiment 3.

[0069] As an embodiment, the first node is in an RRC connected state.

[0070] As an embodiment, any parameter in the present application may be either configured by the network or generated by the first node according to an internal algorithm, such as randomly.

[0071] As an embodiment, the values ​​of the timers in the present application are all limited and do not exceed 2560 milliseconds.

[0072] As an embodiment, the value of the timer is the running time when the timer is not interfered with.

[0073] As an example, the value of any parameter in the present application, including but not limited to the value of a timer and the value of a counter, is limited unless otherwise stated.

[0074] As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 1024 times of 65536.

[0075] As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 65536 or 65535.

[0076] As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 1024.

[0077] As a sub-embodiment of this embodiment, the upper limit of the value of any parameter in this application is 640 or 320.

[0078] As an embodiment, the present application is directed to NR.

[0079] As an embodiment, the present application is directed to a NR evolved wireless communication network.

[0080] As an embodiment, the serving cell refers to the cell where the UE resides. Performing a cell search includes the UE searching for a suitable cell of the selected PLMN (Public Land Mobile Network) or SNPN (Stand-alone Non-Public Network), selecting the suitable cell to provide available services, and monitoring the control channel of the suitable cell. This process is defined as residing on the cell; that is, a residing cell is the serving cell of the UE relative to the UE. Residing on a cell in the RRC idle state or the RRC inactive state has the following benefits: it enables the UE to receive system messages from the PLMN or SNPN; after registration, if the UE wishes to establish an RRC connection or continue a suspended RRC connection, the UE can do so by performing initial access on the control channel of the residing cell; the network can page the UE; and the UE can receive ETWS (Earthquake and Tsunami Warning System) and CMAS (Commercial Mobile Alert System) notifications.

[0081] As an embodiment, for a UE in an RRC connected state that is not configured with CA / DC (carrier aggregation / dual connectivity), there is only one service cell including a primary cell. For a UE in an RRC connected state that is configured with CA / DC (carrier aggregation / dual connectivity), the service cell is used to indicate a set of cells including a special cell (SpCell) and all cells from the small cell. The primary cell (Primary Cell) is an MCG (Master Cell Group) cell that operates on the main frequency. The UE performs an initial connection establishment process or initiates connection reconstruction on the primary cell. For dual connection operations, the special cell refers to the PCell (Primary Cell) of the MCG or the PSCell (Primary SCGCell) of the SCG (Secondary Cell Group); if it is not a dual connection operation, the special cell refers to the PCell.

[0082] As an embodiment, the operating frequency of the SCell (Secondary Cell) is a secondary frequency.

[0083] As an embodiment, the first node is only configured with MCG.

[0084] As an example, individual contents of an information element are referred to as fields.

[0085] As an embodiment, MR-DC (Multi-Radio Dual Connectivity) refers to dual connectivity between E-UTRA and NR nodes, or dual connectivity between two NR nodes.

[0086] As an embodiment, in MR-DC, the wireless access node that provides the control plane connection to the core network is the master node, which may be a master eNB, a master ng-eNB, or a master gNB.

[0087] As an embodiment, MCG refers to a group of service cells associated with a master node in MR-DC, including SpCells, and may also, optionally, include one or more SCells.

[0088] As an embodiment, PCell is the SpCell of MCG.

[0089] As an embodiment, the PSCell is the SpCell of the SCG.

[0090] As an embodiment, in MR-DC, the control plane connection to the core network is not provided, and the radio access node that provides additional resources to the UE is a slave node. The slave node can be an en-gNB, a slave ng-eNB or a slave gNB.

[0091] As an embodiment, in MR-DC, a group of service cells associated with a slave node is a SCG (secondary cell group), including a SpCell and, optionally, one or more SCells.

[0092] As an embodiment, the SpCell is a PCell or the SpCell is a PSCell.

[0093] As an embodiment, in the RRC inactive state, DC is not used.

[0094] As an example, in the RRC inactive state, CA is typically not used.

[0095] As an embodiment, the RRC information block refers to an information block (information element) in an RRC message.

[0096] As an embodiment, SSB may be referred to as SS\PBCH, or SS block.

[0097] As an embodiment, L1 is layer 1 (Layer-1) or physical layer.

[0098] As an embodiment, L2 is layer 2 (Layer-2).

[0099] As an embodiment, the present application is directed to NR and NR evolved networks, such as 6G networks.

[0100] As an embodiment, one RRC information block may include one or more RRC information blocks.

[0101] As an embodiment, an RRC information block may not include any RRC information block, but only include at least one parameter.

[0102] As an embodiment, the radio bearer includes at least a signaling radio bearer and a data radio bearer.

[0103] As an embodiment, the radio bearer is a service or an interface of a service provided by the PDCP layer to a higher layer.

[0104] As a sub-embodiment of this embodiment, the higher layer includes one of the RRC sublayer, NAS, and SDAP layer.

[0105] As an embodiment, the signaling radio bearer is a service or an interface of services provided by PDCP to a higher layer.

[0106] As a sub-embodiment of this embodiment, the higher layer includes an RRC sublayer, at least the former in NAS.

[0107] As an embodiment, the data radio bearer is a service or an interface of services provided by PDCP to a higher layer.

[0108] As a sub-embodiment of this embodiment, the higher layer includes the SDAP layer, at least the former in NAS.

[0109] As an embodiment, after the first node establishes an RRC connection with the network, the first node enters an RRC connection state.

[0110] As a sub-embodiment of this embodiment, the network is a Radio Access Network (RAN).

[0111] As an embodiment, when the first node does not establish an RRC connection with the network, the first node is in an RRC idle state.

[0112] As a sub-embodiment of this embodiment, the network is a Radio Access Network (RAN).

[0113] As an embodiment, when the RRC connection established between the first node and the network is suspended, the first node enters an RRC inactive state.

[0114] As a sub-embodiment of this embodiment, the network is a Radio Access Network (RAN).

[0115] As an embodiment, different functions are supported in different RRC states.

[0116] As an embodiment, only very limited functions are supported in the non-RRC connected state.

[0117] As an embodiment, the non-RRC connected state is or includes an RRC idle state.

[0118] As an embodiment, the non-RRC connected state is or includes an RRC inactive state.

[0119] As an embodiment, the first node is not in limited service mode.

[0120] As an embodiment, the method proposed in the present application and the scenario based thereon are not aimed at emergency services.

[0121] As an embodiment, the first node does not receive an uplink grant before the MAC sublayer determines that a non-RACH LTM cell handover is not in progress.

[0122] As an embodiment, the first node does not receive an uplink grant after the MAC sublayer determines that a non-RACH LTM cell handover is in progress and before the MAC sublayer determines that a non-RACH LTM cell handover is not in progress.

[0123] As an embodiment, the first node does not receive an uplink grant before the first timer expires.

[0124] As an embodiment, the first node does not receive an uplink grant during the expiration of the first timer.

[0125] As an embodiment, the first node does not receive an uplink grant after the MAC sublayer determines that a non-RACH LTM cell handover is in progress and before the first timer expires.

[0126] As an embodiment, before the first timer expires, the MAC layer of the first node does not indicate to a higher layer that the non-RACH LTM cell switching is successfully completed.

[0127] As an embodiment, the MAC layer of the first node does not indicate to a higher layer that the non-RACH LTM cell switching is successfully completed.

[0128] As an embodiment, the non-RACH LTM cell switching fails to be completed successfully.

[0129] As an embodiment, the receiving of at least one candidate configuration is performed at the RRC layer.

[0130] As an embodiment, any of the at least one candidate configuration is an RRC configuration.

[0131] As an embodiment, the at least one candidate configuration includes at most 8 candidate configurations.

[0132] As an embodiment, any one of the at least one candidate configuration has a configuration identifier.

[0133] As an embodiment, the at least one candidate configuration belongs to a list included in an RRC message.

[0134] As an embodiment, the at least one candidate configuration belongs to LTM-Config.

[0135] As an embodiment, the at least one candidate configuration belongs to ltm-CandidateToAddModList.

[0136] As an embodiment, any one of the at least one candidate configuration is for LTM cell switching.

[0137] As an embodiment, any of the at least one candidate configuration is for LTM.

[0138] As an embodiment, any one of the at least one candidate configuration is for an LTM candidate cell.

[0139] As an embodiment, the at least one candidate configuration needs to be stored in a state variable after being received.

[0140] As an embodiment, any one of the at least one candidate configuration is an LTM-Candidate.

[0141] As an embodiment, the at least one candidate configuration includes at least 2 candidate configurations.

[0142] As an embodiment, the at least one candidate configuration includes a limited number of candidate configurations.

[0143] As an embodiment, the at least one candidate configuration includes multiple candidate configurations.

[0144] As an embodiment, the ltm-CandidateConfig of any of the at least one candidate configuration includes an RRC reconfiguration message.

[0145] As an embodiment, the RRC reconfiguration message is an RRC message embedded in each candidate configuration.

[0146] As an embodiment, the RRC reconfiguration message is used for RRC connection reconfiguration.

[0147] As an embodiment, the benefits of using the RRC reconfiguration message include: the RRC connection can be reconfigured differently; it is conducive to faster reconfiguration, shortening the configuration time, saving power, and having better compatibility; and the implementation complexity is low.

[0148] As an embodiment, the RRC reconfiguration message included in any candidate configuration of the at least one candidate configuration configures the target cell.

[0149] As an embodiment, the RRC reconfiguration message included in any candidate configuration of the at least one candidate configuration configures the SpCell of the first node.

[0150] As an embodiment, the RRC reconfiguration message included in any candidate configuration of the at least one candidate configuration configures a cell group.

[0151] As a sub-embodiment of this embodiment, the cell group is MCG or SCG.

[0152] As an embodiment, the RRC reconfiguration message included in any candidate configuration of the at least one candidate configuration configures MCG and SCG.

[0153] As an embodiment, any of the at least one candidate configuration includes an SSB configuration.

[0154] As an embodiment, any one of the at least one candidate configuration indicates whether the included configuration is complete.

[0155] As an embodiment, the RRC reconfiguration message included in the first candidate configuration is incomplete.

[0156] As an embodiment, the RRC reconfiguration message included in the explicit indication of the first candidate configuration is incomplete.

[0157] As an embodiment, the configuration explicitly indicated by the first candidate configuration is incomplete.

[0158] As an embodiment, the included configuration or the included RRC reconfiguration message is incomplete, which is beneficial to reducing signaling overhead.

[0159] As an embodiment, the first signaling is a MAC layer signaling.

[0160] As an embodiment, the first signaling is an LTM signaling.

[0161] As an embodiment, the first signaling is LTM Cell Switch Command MAC CE.

[0162] As an embodiment, the advantage of the first signaling being MAC CE is that it is faster than RRC signaling and is conducive to shortening the delay of LTM cell switching.

[0163] As an embodiment, the advantage of the first signaling being MAC CE is that it has stronger scalability compared to physical layer signaling.

[0164] As an embodiment, the sender of the first signaling is the same as the sender of the at least one candidate configuration.

[0165] As an embodiment, the sender of the first signaling is different from the sender of the at least one candidate configuration.

[0166] As a sub-embodiment of this embodiment, this method does not need to reconfigure the candidate configuration, thereby reducing signaling overhead.

[0167] As an embodiment, the first signaling is received at the MAC layer.

[0168] As an embodiment, the sender of the first signaling is the source cell of the first node.

[0169] As an embodiment, the sender of the first signaling is the SpCell of the first node.

[0170] As an embodiment, the first signaling explicitly indicates the first candidate configuration among the at least one candidate configuration.

[0171] As an embodiment, the first signaling triggers the MAC sublayer of the first node to determine that a non-RACH LTM cell switching is in progress.

[0172] As an embodiment, in response to receiving the first signaling, the first candidate configuration is applied at the RRC sublayer.

[0173] As an embodiment, the first signaling triggers the RRC sublayer of the first node to apply the first candidate configuration.

[0174] As an embodiment, the first signaling includes an identifier of the first candidate configuration.

[0175] As an embodiment, the first signaling only includes an identifier of the first candidate configuration among the at least one candidate configuration.

[0176] As an embodiment, the non-RACH LTM cell switch is a RACH-less LTM cell switch.

[0177] As an embodiment, the non-RACH LTM cell switching being in progress means that the non-RACH LTM cell switching has started but has not yet ended.

[0178] As an embodiment, the non-RACH LTM cell switching in progress means that the non-RACH LTM cell switching is in process.

[0179] As an embodiment, the non-RACH LTM cell handover being performed means that the non-RACH LTM cell handover has not failed.

[0180] As an embodiment, the non-RACH LTM cell switching in progress means that the non-RACH LTM cell switching is not completed.

[0181] As an embodiment, after the first node receives the first signaling and completes the MAC reset, it can be determined that the non-RACH LTM cell switching is in progress.

[0182] As an embodiment, the first signaling is sent to the first node.

[0183] As an embodiment, applying the first candidate configuration includes applying each information block in the first candidate configuration.

[0184] As an embodiment, applying the first candidate configuration includes applying the RRCReconfiguration message in the first candidate configuration.

[0185] As an embodiment, applying the first candidate configuration includes applying all configurations in the first candidate configuration.

[0186] As an embodiment, applying the first candidate configuration includes applying all instructions in the first candidate configuration.

[0187] As an embodiment, applying the first candidate configuration includes applying all signaling or information blocks in the RRC reconfiguration message in the first candidate configuration.

[0188] As an embodiment, the first candidate configuration includes a synchronous reconfiguration of a special cell (SpCell) for the first node.

[0189] As an embodiment, the synchronous reconfiguration is Reconfigurationwithsync.

[0190] As an embodiment, the synchronous reconfiguration is used to configure the SpCell.

[0191] As an embodiment, the synchronous reconfiguration is used to configure the target cell of the first node.

[0192] As an embodiment, the RRC reconfiguration message included in each candidate configuration of the at least one candidate configuration includes a synchronization reconfiguration information block.

[0193] As an embodiment, any candidate configuration of the at least one candidate configuration indicates a candidate cell identifier.

[0194] As a sub-embodiment of this embodiment, the cell identifier is a physical cell identifier.

[0195] As an embodiment, any candidate configuration of the at least one candidate configuration includes an early uplink synchronization configuration.

[0196] As an embodiment, any candidate configuration of the at least one candidate configuration indicates whether to reset the entity of layer 2.

[0197] As a sub-embodiment of this embodiment, the layer 2 entity includes at least one of an RLC entity and a PDCP entity.

[0198] As an embodiment, any candidate configuration of the at least one candidate configuration includes a transmission configuration indication.

[0199] As an embodiment, any candidate configuration of the at least one candidate configuration includes an SSB configuration.

[0200] As an embodiment, the RRC reconfiguration includes configuration for a cell group.

[0201] As an embodiment, the RRC reconfiguration includes configuration for a radio bearer.

[0202] As an embodiment, the RRC reconfiguration includes configuration for a beam.

[0203] As an embodiment, the RRC reconfiguration includes configuration for multicast broadcast services.

[0204] As an embodiment, the RRC reconfiguration includes configuration for PUCCH (Physical uplink control channel).

[0205] As an embodiment, the RRC reconfiguration includes configuration for measurement.

[0206] As a sub-embodiment of this embodiment, the configuration for measurement includes configuration of measurement objects and measurement reports.

[0207] As an embodiment, the synchronization reconfiguration includes the C-RNTI of the first node.

[0208] As an embodiment, the synchronous reconfiguration includes the C-RNTI of the first node in the serving cell configured by the corresponding candidate configuration.

[0209] As an embodiment, the synchronous reconfiguration includes configuration of the T304 timer.

[0210] As an embodiment, the synchronous reconfiguration includes SMTC (SSB Measurement timing configuration).

[0211] As an embodiment, the first candidate configuration includes the benefits of synchronous reconfiguration for the special cell of the first node, including: using synchronous reconfiguration is necessary to implement cell switching, and provides the most core configuration in the target cell.

[0212] As an embodiment, the running time of the first timer is not infinite.

[0213] As an embodiment, the value of the first timer is limited.

[0214] As an embodiment, the first timer runs for no more than 10 seconds without intervention.

[0215] As an embodiment, the value of the first timer is configurable.

[0216] As an embodiment, the candidate values ​​of the first timer include one of 50 milliseconds, 100 milliseconds, 150 milliseconds, and 200 milliseconds.

[0217] As an embodiment, the first timer is configured by the first candidate configuration.

[0218] As an embodiment, the name of the first timer includes T3.

[0219] As an embodiment, the first timer is a T3xx timer, wherein xx represents two Arabic numerals.

[0220] As an embodiment, the first timer is a T304 timer.

[0221] As an embodiment, the first timer is a T304a timer.

[0222] As an embodiment, the first timer is a timer of the RRC layer.

[0223] As an embodiment, the advantage of the first timer being a timer of the RRC layer rather than a timer of the MAC layer is that it is conducive to comprehensive control, that is, in this field, RRC controls MAC, so the implementation complexity is relatively low. At the same time, after the first timer expires, it can trigger RRC to perform other routine processing, which is more convenient to manage.

[0224] As an embodiment, the cell configured by the first candidate configuration is a special cell of the first node.

[0225] As an embodiment, the cell configured by the first candidate configuration is the PCell of the first node.

[0226] As an embodiment, the cell configured by the first candidate configuration is the PSCell of the first node.

[0227] As an embodiment, the cell configured by the first candidate configuration is one of the PCell or SPCell of the first node.

[0228] As an embodiment, the first node determines whether a non-RACH LTM cell switching is in progress based on the running status of the first timer.

[0229] As an embodiment, the expiration of the first timer triggers the MAC layer of the first node to determine that the non-RACH LTM cell switching is no longer in progress.

[0230] As an embodiment, the initiation of the first timer is accompanied by the MAC layer of the first node determining that the non-RACH LTM cell switching is in progress.

[0231] As an embodiment, while the first timer is running, the MAC layer of the first node determines that the non-RACH LTM cell switching is in progress.

[0232] As an embodiment, while the first timer is running, the MAC layer of the first node determines that the non-RACH LTM cell switch is in progress before the non-RACH LTM cell switch is successfully completed.

[0233] As an embodiment, a MAC entity has at most one ongoing LTM cell switch at the same time.

[0234] As an embodiment, a MAC entity has at most one ongoing non-RACH LTM cell switch at the same time.

[0235] As an embodiment, one MCG has only one MAC entity.

[0236] As an embodiment, one SCG has only one MAC entity.

[0237] As an embodiment, in the MAC layer in the present application refers to in a MAC entity.

[0238] As an embodiment, the first node has only one RRC entity.

[0239] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switching is not in progress depends on the expiration of the first timer, which means that the expiration of the first timer is used to determine that the non-RACH LTM cell switching is not in progress.

[0240] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer, which means that the expiration of the first timer is used to trigger the MAC layer to determine that the non-RACH LTM cell switching is no longer in progress.

[0241] Typically, the first node is not required to monitor the PDCCH in the measurement gap, that is, only in special circumstances, the first node is required to monitor the PDCCH in the measurement gap.

[0242] As an embodiment, when the first node performs inter-frequency measurement within the measurement gap, the first node cannot monitor the PDCCH, which will affect the performance of the LTM cell switching of the first node, such as the switching delay. Therefore, when the first node determines that monitoring the PDCCH within the measurement gap based on the fact that a non-RACH LTM cell switching is in progress, it helps to improve the performance of the LTM cell switching.

[0243] As an embodiment, when the first node monitors PDCCH within the measurement gap, the first node cannot perform heterofrequency measurement, which will affect the measurement result and thus affect the wireless resource management; therefore, when the first node determines that monitoring PDCCH within the measurement gap is not in progress based on the fact that non-RACH LTM cell switching is not in progress, it helps to improve the measurement performance.

[0244] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depends on one of the expiration of the first timer or the successful completion of the non-RACH LTM cell switch.

[0245] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switching is not in progress relying on the expiration of the first timer means that the expiration of the first timer triggers the determination at the MAC sublayer that the non-RACH LTM cell switching is not in progress.

[0246] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depending on the expiration of the first timer means that when the first timer is running, the MAC sublayer determines that the non-RACH LTM cell switching is in progress.

[0247] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switching is not in progress relying on the expiration of the first timer means that when the first timer is running, it does not trigger the determination at the MAC sublayer that the non-RACH LTM cell switching is not in progress.

[0248] As an embodiment, the active time of the MAC of the first node depends on whether the non-RACH LTM cell switching is in progress.

[0249] As an embodiment, whether the LTM cell is determined and whether the LTM cell switching relying on the non-RACH is successfully completed is in progress.

[0250] As an embodiment, when the non-RACH LTM cell handover is in progress and an uplink grant or a downlink grant is received, the MAC layer of the first node determines that the non-RACH LTM cell handover is successfully completed.

[0251] As an embodiment, when the non-RACH LTM cell handover is not in progress and an uplink grant or a downlink grant is received, the MAC layer of the first node does not determine that the non-RACH LTM cell handover is successfully completed.

[0252] As an embodiment, when the MAC layer of the first node determines that the non-RACH LTM cell switching is successfully completed, the MAC layer of the first node indicates to the RRC layer that the non-RACH LTM cell switching is successfully completed.

[0253] As an embodiment, it can be seen from the above methods that if the MAC entity of the first node cannot properly determine that the non-RACH LTM cell switching is not in progress, it will misjudge that the non-RACH LTM cell switching is successfully completed, and will cause interference to the RRC layer.

[0254] As an embodiment, whether to determine the NDI (new data indicator) bit flip depends on whether a non-RACH LTM cell handover is in progress.

[0255] As an embodiment, the NDI is indicated by the received DCI.

[0256] As an embodiment, the DCI is signaling of the physical layer.

[0257] As an embodiment, for each serving cell and each configured uplink grant, when a non-RACH LTM cell handover is in progress, it is determined that the NDI bit of the corresponding HARQ process is flipped.

[0258] As a sub-embodiment of this embodiment, when other conditions for determining that the NDI bit is flipped are not met except that a non-RACH LTM cell switching is in progress.

[0259] As an embodiment, for each serving cell and each configured uplink grant, when non-RACH LTM cell switching is not in progress, it is determined whether the NDI bit of the corresponding HARQ process is flipped.

[0260] As an embodiment, each configured uplink grant is associated with a HARQ process.

[0261] As an embodiment, the corresponding HARQ process is the HARQ process corresponding to the configured uplink grant.

[0262] As an embodiment, how to determine which HARQ process the configured uplink grant corresponds to is a prior art in the art.

[0263] As an embodiment, whether NDI is reversed is used to determine whether it is an initial transmission or a retransmission. Taking the initial transmission as a retransmission, or taking the retransmission as the initial transmission will cause reception errors. Therefore, it can be seen that the method proposed in the present application can accurately determine whether a non-RACH LTM cell switch is in progress, thereby avoiding the above-mentioned problem.

[0264] As an embodiment, whether to submit the configured uplink grant and the HARQ information of the associated HARQ entity depends on whether a non-RACH LTM cell handover is in progress.

[0265] As a sub-embodiment of this embodiment, the MAC layer of the first node delivers the configured uplink grant and the HARQ information of the associated HARQ entity to the HARQ entity.

[0266] As a sub-embodiment of this embodiment, the MAC layer of the first node delivers the configured uplink grant and HARQ information of the associated HARQ entity to the HARQ entity associated with the configured uplink grant.

[0267] As a sub-embodiment of this embodiment, the HARQ information of the associated HARQ entity is associated with the configured uplink grant.

[0268] As a sub-embodiment of this embodiment, what is the configured uplink grant and the HARQ information of the associated HARQ entity is the prior art in the art.

[0269] As an embodiment, when non-RACH LTM cell handover is in progress, the configured uplink grant and HARQ information of the associated HARQ entity are delivered.

[0270] As an embodiment, when non-RACH LTM cell switching is not in progress, the configured uplink grant and the HARQ information of the associated HARQ entity are not delivered.

[0271] As an embodiment, the above method helps the HARQ entity to perform correct transmission and helps the HARQ entity to obtain correctly configured uplink grant information.

[0272] As an embodiment, whether to select the SSB associated with the TCI state indicated by the first type of signaling depends on whether non-RACH LTM cell switching is in progress.

[0273] As an embodiment, when non-RACH LTM cell switching is in progress, an SSB associated with the TCI state indicated by the first type of signaling is selected.

[0274] As an embodiment, when non-RACH LTM cell switching is not in progress, the SSB associated with the TCI state indicated by the first type of signaling is not selected.

[0275] As an embodiment, when for LTM cell switching, for a configured uplink grant of configuration grant type 1, when non-RACH LTM cell switching is in progress, for each valid and required configured uplink grant, if the index of the SSB corresponding to the configured uplink grant is the same as the index of the SSB associated with the TCI state indicated by the first type of signaling, then the configured uplink grant is determined to be valid; otherwise, the configured uplink grant is determined to be invalid.

[0276] As an embodiment, what is TCI associated SSB, what is the index of SSB, what is the configured uplink grant associated SSB, what is the configured grant type 1, what is the configured grant, and what is the configured uplink grant are all prior arts in this field.

[0277] As an embodiment, the above method can be helpful to correctly determine the uplink grant of effective configuration, avoid errors, improve communication efficiency, avoid resource waste, and reduce conflicts and interference.

[0278] As an embodiment, whether the SSB index is indicated to the lower layer of the MAC layer and whether non-RACH LTM cell switching is in progress.

[0279] As an embodiment, the SSB index is the index of the SSB associated with the TCI state.

[0280] As an embodiment, whether the configured uplink grant is available depends on whether a non-RACH LTM cell handover is in progress.

[0281] As an example, how the TCI status is associated with the index of an SSB is prior art in the art.

[0282] As an embodiment, the first type of signaling is MAC CE.

[0283] As an embodiment, the first type of signaling is a signaling with the same name as the first signaling.

[0284] As an embodiment, the first type of signaling includes the first signaling.

[0285] As an embodiment, the first type of signaling is an LTM Cell Switch Command MAC CE.

[0286] As an embodiment, the determination that the non-RACH LTM cell switch is ongoing means: consider the RACH-less LTM cell switch to be ongoing.

[0287] As an embodiment, the determination that the non-RACH LTM cell switch is not in progress means: not consider the RACH-less LTM cell switch to be ongoing.

[0288] As an embodiment, the determination that the non-RACH LTM cell switch is no longer in progress means: stopconsider the RACH-less LTM cell switch to be ongoing.

[0289] As an embodiment, the determination that the non-RACH LTM cell switch is not ongoing means: consider the RACH-less LTM cell switch not to be ongoing.

[0290] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depending on the expiration of the first timer includes: the RRC sublayer of the first node explicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0291] As an embodiment, the RRC sublayer of the first node explicitly instructs the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node instructs the MAC sublayer to stop the non-RACH LTM cell switching.

[0292] As an embodiment, the RRC sublayer of the first node explicitly instructs the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node instructs the MAC sublayer that the non-RACH LTM cell switching is not configured.

[0293] As an embodiment, the RRC sublayer of the first node explicitly instructs the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node instructs the MAC sublayer that the non-RACH LTM cell switching is completed or ended.

[0294] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depends on the expiration of the first timer, including: the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0295] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates to the MAC sublayer that the first timer has expired.

[0296] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, and the MAC sublayer reset of the first node includes determining that the non-RACH LTM cell switching is no longer in progress.

[0297] As an embodiment, the MAC sublayer reset includes clearing HARQ.

[0298] As an embodiment, the MAC sublayer reset includes stopping a timer.

[0299] As an embodiment, the MAC sublayer reset includes resetting state variables.

[0300] As an embodiment, the MAC sublayer reset does not include deleting the MAC layer configuration.

[0301] As an embodiment, the MAC sublayer reset does not include stopping measurement.

[0302] As an embodiment, the MAC sublayer reset does not include stopping monitoring the PDCCH.

[0303] As an embodiment, the MAC sublayer reset does not include stopping receiving MAC CE.

[0304] As an embodiment, expiration of the first timer triggers the RRC sublayer of the first node to indicate a MAC sublayer reset.

[0305] As an embodiment, expiration of the first timer triggers RRC connection reconstruction, and the RRC connection reconstruction includes MAC sublayer reset.

[0306] As an embodiment, the RRC connection reconstruction includes applying one of the at least one candidate configuration, including the RRC layer indicating the MAC sublayer reconstruction.

[0307] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, the MAC sublayer reset of the first node triggers the expiration of the timing advance timer, and the expiration of the timing advance timer triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress.

[0308] As an example, what is a timing advance timer is prior art in the art.

[0309] As an embodiment, the meaning of the MAC sublayer reset of the first node triggering the expiration of the timing advance timer is: in the MAC sublayer reconstruction of the first node, the timing advance timer is set to expire.

[0310] As an embodiment, the MAC sublayer of the first node is used to maintain or attempt to maintain the uplink timing advance.

[0311] As an embodiment, expiration of the timing advance timer means uplink out-of-sync.

[0312] As an embodiment, when the expiration of the timing advance timer triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress, the meaning is: once the timing advance timer of the MAC sublayer of the first node expires, the MAC sublayer determines that the non-RACH LTM cell switching is no longer in progress.

[0313] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates first configuration information to the MAC sublayer, and the first configuration information triggers the MAC sublayer to determine that the non-RACH LTM cell switching is not in progress.

[0314] As an embodiment, the first configuration information is information used to configure the MAC sublayer.

[0315] As an embodiment, the first configuration information is the configuration of the MAC sublayer.

[0316] As an embodiment, whether non-RACH LTM cell switching is in progress depends on the first configuration information.

[0317] As an embodiment, the first configuration information is indicated by the RRC sublayer to the MAC sublayer.

[0318] As an embodiment, the first configuration information includes whether non-RACH cell switching or non-RACH LTM cell switching is supported or configured or allowed.

[0319] As an embodiment, the first configuration information includes supporting only RACH-based LTM cell switching.

[0320] As an embodiment, the first configuration information includes an indication that the LTM cell handover configuration has changed.

[0321] As an embodiment, the first configuration information includes no longer using UE-based timing advance measurement.

[0322] As an embodiment, expiration of the first timer triggers the MAC sublayer to determine that UE-based timing advance measurement is not configured.

[0323] As an embodiment, the UE-based timing advance measurement refers to determining the required timing advance according to the UE measurement.

[0324] As an embodiment, in contrast to the timing advance based on the UE, there is a timing advance command based on network indication.

[0325] As an embodiment, the first node is allowed to use UE-based timing advance only when UE-based timing advance measurement is configured.

[0326] As an embodiment, expiration of the first timer triggers the RRC sublayer of the first node to explicitly indicate that the MAC sublayer is not configured with UE-based timing advance measurement.

[0327] As an embodiment, expiration of the first timer triggers the RRC sublayer of the first node to explicitly instruct the MAC sublayer to stop using UE-based timing advance measurement.

[0328] As an embodiment, expiration of the first timer triggers the RRC sublayer of the first node to indicate a MAC sublayer reset, and the MAC sublayer reset includes determining that UE-based timing advance measurement is not configured.

[0329] Example 2

[0330] Embodiment 2 illustrates a schematic diagram of a network architecture according to the present application, as shown in the attached Figure 2 shown.

[0331] Attached Figure 2A diagram of a network architecture 200 for 5G NR, LTE (Long-Term Evolution) and LTE-A (Long-Term Evolution Advanced) systems is illustrated. The 5G NR or LTE network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, NG-RAN (Next Generation Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet services 230. The 5GS / EPS may be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, 5GS / EPS provides packet-switched services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application can be extended to networks providing circuit-switched services or other cellular networks. NG-RAN includes NR Node B (gNB) 203 and other gNBs 204. gNB 203 provides user and control plane protocol terminations toward UE 201. gNB 203 can be connected to other gNBs 204 via an Xn interface (e.g., backhaul). gNB 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (transmitting receiving node), or some other suitable term. gNB 203 provides an access point to 5GC / EPC 210 for UE 201. Examples of UE 201 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, non-terrestrial base station communications, satellite mobile communications, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, cars, wearable devices, or any other similar functional devices. Those skilled in the art may also refer to UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.gNB203 is connected to 5GC / EPC210 via the S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF213. MME / AMF / SMF211 is the control node that handles signaling between UE201 and 5GC / EPC210. ​​In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which itself is connected to P-GW / UPF213. P-GW provides UE IP address allocation and other functions. P-GW / UPF213 is connected to Internet service 230. Internet service 230 includes operator-corresponding Internet protocol services, which may specifically include Internet, Intranet, IMS (IP Multimedia Subsystem) and packet-switched streaming services.

[0332] As an embodiment, the first node in the present application is UE201.

[0333] As an embodiment, the base station of the second node in the present application is gNB203.

[0334] As an embodiment, the wireless link from the UE201 to the NR Node B is an uplink.

[0335] As an embodiment, the wireless link from the NR Node B to UE201 is a downlink.

[0336] As an embodiment, the UE 201 includes a mobile phone.

[0337] As an embodiment, the UE201 is a dedicated device or special device with communication function.

[0338] As an embodiment, the gNB203 is a micro cell base station.

[0339] As an embodiment, the gNB203 is a pico cell base station.

[0340] As an embodiment, the gNB203 is a base station used in a home network.

[0341] As an embodiment, the gNB203 is a base station used in a private network.

[0342] As an embodiment, the gNB203 is a base station used in an enterprise network.

[0343] Example 3

[0344] Embodiment 3 shows a schematic diagram of an embodiment of a wireless protocol architecture of a user plane and a control plane according to the present application, as shown in the attached Figure 3 shown. Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture of the control plane 300 for a first node (UE, gNB) and a second node (gNB, UE), or between two UEs is shown in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to as PHY301 herein. Layer 2 (L2 layer) 305 is above PHY301 and is responsible for the link between the first node and the second node and the two UEs through PHY301. The L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by encrypting data packets, and provides support for inter-zone mobility of the first node between the second node. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between the first nodes. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layer using RRC signaling between the second node and the first node. The PC5-S (PC5 Signaling Protocol) sublayer 307 is responsible for processing the signaling protocol of the PC5 interface. The radio protocol architecture of the user plane 350 includes Layer 1 (L1 layer) and Layer 2 (L2 layer). The radio protocol architecture for the first node and the second node in the user plane 350 is substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead.The L2 layer 355 in the user plane 350 also includes an SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping between QoS flows and data radio bearers (DRBs) to support the diversity of services. SRB can be regarded as a service or interface provided by the PDCP layer to a higher layer, such as the RRC sublayer. In the NR system, SRBs include SRB1, SRB2, and SRB3, which are used to transmit different types of control signaling. SRB is a bearer between the UE and the access network, and is used to transmit control signaling including RRC signaling between the UE and the access network. SRB1 has special significance for the UE. After each UE establishes an RRC connection, there will be SRB1 for transmitting RRC signaling. Most of the signaling is transmitted through SRB1. If SRB1 is interrupted or cannot be used, the UE must perform RRC reconstruction. SRB2 is generally only used to transmit NAS signaling or security-related signaling. The UE may not configure SRB3. Except for emergency services, the UE must establish an RRC connection with the network for subsequent communications. Although not shown, the first node may have several upper layers above the L2 layer 355. In addition, it also includes a network layer (e.g., IP layer) terminated at the P-GW on the network side and an application layer terminated at the other end of the connection (e.g., remote UE, server, etc.). The protocol layer may also be referred to as a protocol sublayer. Attached. Figure 3 What is shown is a general protocol layer structure, and the nodes used in this application may lack some protocol layers.

[0345] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0346] As an example, Figure 3 The wireless protocol architecture in is applicable to the second node in this application.

[0347] As an embodiment, the at least one candidate configuration in the present application is generated in RRC306.

[0348] As an embodiment, the first signaling in the present application is generated by MAC302.

[0349] As an embodiment, the RRC connection reestablishment request in the present application is generated in RRC306.

[0350] As an embodiment, the first configuration information in the present application is generated in RRC306.

[0351] As an embodiment, the NDI in the present application is generated in PHY301.

[0352] As an embodiment, the DCI in the present application is generated in PHY301.

[0353] Example 4

[0354] Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to an embodiment of the present application, as shown in the attached figure. Figure 4 shown. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0355] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, and may optionally also include a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter / receiver 454 and an antenna 452.

[0356] The second communication device 410 includes a controller / processor 475 , a memory 476 , a receiving processor 470 , a transmitting processor 416 , and may optionally also include a multi-antenna receiving processor 472 , a multi-antenna transmitting processor 471 , a transmitter / receiver 418 and an antenna 420 .

[0357] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, the upper layer data packets from the core network are provided to the controller / processor 475. The controller / processor 475 implements the functionality of the L2 (Layer-2) layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for the retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. The multi-antenna transmit processor 471 then performs a transmit analog precoding / beamforming operation on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, and then provides it to a different antenna 420.

[0358] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream and provides it to the receiving processor 456. The receiving processor 456 and the multi-antenna receiving processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiving processor 458 performs a receiving analog precoding / beamforming operation on the baseband multi-carrier symbol stream from the receiver 454. The receiving processor 456 uses a fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receiving analog precoding / beamforming operation from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiving processor 456, wherein the reference signal will be used for channel estimation, and the data signal is recovered after multi-antenna detection in the multi-antenna receiving processor 458 to any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in the receiving processor 456, and soft decisions are generated. The receiving processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program codes and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the second communication device 450, the controller / processor 459 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packets from the core network. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

[0359] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, a data source 467 is used to provide upper layer data packets to the controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission function at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocation, and implements L2 layer functions for user plane and control plane. The controller / processor 459 is also responsible for the retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping and channel coding processing, and the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Then, the transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, which is then provided to different antennas 452 via the transmitter 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream, and then provides it to the antenna 452.

[0360] In the transmission from the first communication device 450 to the second communication device 410, the function at the second communication device 410 is similar to the reception function at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna reception processor 472 and the reception processor 470. The reception processor 470 and the multi-antenna reception processor 472 jointly implement the functions of the L1 layer. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 can be associated with a memory 476 storing program codes and data. The memory 476 can be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the UE 450. Upper layer packets from controller / processor 475 may be provided to the core network.

[0361] As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 apparatus at least: receives at least one candidate configuration, any candidate configuration of the at least one candidate configuration includes an RRC reconfiguration message; receives a first signaling, the first signaling is a MAC CE; the first signaling indicates a first candidate configuration of the at least one candidate configuration; as a response to receiving the first signaling, determines at the MAC sublayer that a non-RACH LTM cell switch is in progress, and applies the first candidate configuration at the RRC sublayer, wherein the applying of the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer is a timer of the RRC sublayer; determines at the MAC sublayer that the non-RACH LTM cell switch is not in progress; wherein the determination at the MAC sublayer that the non-RACH LTM cell switch is not in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration for a special cell of the first node; whether to monitor the PDCCH within the measurement gap depends on whether the non-RACH LTM cell switch is in progress.

[0362] As an embodiment, the first communication device 450 includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, the action including: receiving at least one candidate configuration, any candidate configuration in the at least one candidate configuration including an RRC reconfiguration message; receiving a first signaling, wherein the first signaling is a MAC CE; the first signaling indicates a first candidate configuration in the at least one candidate configuration; as a response to receiving the first signaling, determining at the MAC sublayer that a non-RACH LTM cell switch is in progress, and applying the first candidate configuration at the RRC sublayer, wherein the applying of the first candidate configuration at the RRC sublayer includes: starting a first timer, wherein the first timer is a timer of the RRC sublayer; determining at the MAC sublayer that the non-RACH LTM cell switch is not in progress; wherein the determining at the MAC sublayer that the non-RACH LTM cell switch is not in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; whether to monitor the PDCCH within the measurement gap depends on whether the non-RACH LTM cell switch is in progress.

[0363] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0364] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0365] As an embodiment, the first communication device 450 is a UE.

[0366] As an embodiment, the first communication device 450 is a mobile phone.

[0367] As an embodiment, the second communication device 450 is a relay.

[0368] As an embodiment, the second communication device 410 is a base station.

[0369] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used to receive the at least one candidate configuration in the present application.

[0370] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used to receive the first signaling in the present application.

[0371] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used to receive the NDI in the present application.

[0372] As an embodiment, the receiver 454 (including the antenna 452), the receiving processor 456 and the controller / processor 459 are used to receive the DCI in the present application.

[0373] As an embodiment, the transmitter 454 (including the antenna 452), the transmit processor 468 and the controller / processor 459 are used to send the RRC re-establishment request in the present application.

[0374] Example 5

[0375] Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Figure 5 Attached Figure 5 In the example, U01 corresponds to the first node of the present application. It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in the present application, wherein the steps in S5105 and S5108 are optional.

[0376] for First node U01, receiving at least one candidate configuration in step S5101; receiving a first signaling in step S5102; applying the first candidate configuration in the RRC sublayer in step S5103; determining in the MAC sublayer that a non-RACH LTM cell switch is in progress in step S5104; monitoring the PDCCH in step S5105; the first timer expires in step S5106; determining in the MAC sublayer that a non-RACH LTM cell switch is not in progress in step S5107; and initiating RRC connection reconstruction in step S5108.

[0377] for Second node U02 , at least one candidate configuration is sent in step S5201; and a first signaling is sent in step S5202.

[0378] In embodiment 5, any candidate configuration of the at least one candidate configuration includes an RRC reconfiguration message; the first signaling is a MAC CE; the first signaling indicates a first candidate configuration of the at least one candidate configuration; as a response to receiving the first signaling, steps S5103 and S5104 are executed, wherein step S5104 includes: starting a first timer, the first timer being a timer of the RRC sublayer; determining at the MAC sublayer that the non-RACH LTM cell switch is not in progress; wherein the determination at the MAC sublayer that the non-RACH LTM cell switch is not in progress depends on the expiration of the first timer; the first candidate configuration includes synchronous reconfiguration of a special cell for the first node; whether to monitor PDCCH within a measurement gap depends on whether the non-RACH LTM cell switch is in progress.

[0379] As an embodiment, the second node U02 is a base station corresponding to the PCell of the first node U01.

[0380] As an embodiment, the second node U02 is the service cell of the first node or the base station corresponding to the service cell.

[0381] As an embodiment, the second node U02 belongs to a cellular network.

[0382] As an embodiment, the second node U02 corresponds to the source cell.

[0383] As an example, Figure 5 The order in which the steps are numbered is the chronological order.

[0384] As an embodiment, the method proposed in the present application is also applicable to the case where the senders of the at least one candidate configuration and the first signaling are different.

[0385] As an embodiment, the second node U02 sends the at least one candidate configuration via at least one RRC message.

[0386] As an embodiment, the at least one RRC message includes an RRC reconfiguration message.

[0387] As an embodiment, the at least one RRC message includes an RRCReconfiguration message.

[0388] As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that LTM cell switching is supported.

[0389] As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that non-RACH LTM cell switching is supported.

[0390] As an embodiment, before step S5101, the first node U01 indicates to the second node U02 that UE-based timing advance is supported.

[0391] As an embodiment, the first signaling is received after receiving the at least one candidate configuration.

[0392] As an embodiment, the logical channel corresponding to the first signaling is fixed.

[0393] As an embodiment, applying the first candidate configuration in the RRC sublayer includes starting the first timer.

[0394] As an embodiment, applying the first candidate configuration at the RRC sublayer includes instructing the MAC sublayer to reset the MAC sublayer.

[0395] As an embodiment, the determination at the MAC sublayer that a non-RACH LTM cell switch is in progress means that the MAC entity believes that a non-RACH LTM cell switch is in progress.

[0396] As an embodiment, determining at the MAC sublayer that the non-RACH LTM cell switching is in progress means that the MAC sublayer sets the state of the non-RACH LTM cell switching to in progress.

[0397] As an embodiment, the determination at the MAC sublayer that a non-RACH LTM cell switch is in progress means that when the first signaling is received, a non-RACH LTM cell switch is in progress.

[0398] As an embodiment, the determination at the MAC sublayer that a non-RACH LTM cell switch is in progress means that: if the first signaling is received and the MAC sublayer reconstruction is completed, then a non-RACH LTM cell switch is in progress.

[0399] As an embodiment, the determination at the MAC sublayer that a non-RACH LTM cell switch is in progress means that: the first signaling is received, the MAC sublayer reconstruction is completed, and the first signaling indicates a timing advance value other than FFF, then a non-RACH LTM cell switch is in progress.

[0400] As an embodiment, the determination at the MAC sublayer that a non-RACH LTM cell switch is in progress means that: the first signaling is received, and the MAC sublayer reconstruction is completed, and the first signaling indicates a timing advance of the value FFF, and the MAC sublayer is configured by the RRC sublayer with a timing advance based on UE measurements and the timing advance measurement is completed, then a non-RACH LTM cell switch is in progress.

[0401] As an embodiment, the RRC sublayer determines whether to use UE-based timing advance according to implementation.

[0402] As an embodiment, the RRC sublayer determines whether to use UE-based timing advance according to whether the target cell and the source cell belong to the same cell group.

[0403] As an embodiment, when the LTM target cell and the source cell belong to the same cell group, the RRC sublayer instructs the MAC sublayer to use UE-based timing advance; when the LTM target cell and the source cell do not belong to the same cell group, the RRC sublayer does not instruct the MAC sublayer to use UE-based timing advance.

[0404] As an embodiment, when the LTM target cell and the source cell belong to the same control unit (CU), the RRC sublayer instructs the MAC sublayer to use UE-based timing advance; when the LTM target cell and the source cell do not belong to the same CU, the RRC sublayer does not instruct the MAC sublayer to use UE-based timing advance.

[0405] As an embodiment, when the LTM target cell and the source cell belong to the same data unit (DU), the RRC sublayer instructs the MAC sublayer to use UE-based timing advance; when the LTM target cell and the source cell do not belong to the same DU, the RRC sublayer does not instruct the MAC sublayer to use UE-based timing advance.

[0406] As an embodiment, the MAC entity is a MAC entity that receives the first signaling.

[0407] As an embodiment, the meaning of MAC sublayer reset in the present application is equal to MAC entity reset or MAC reset.

[0408] As an embodiment, step S5104 is performed after the MAC entity is reset.

[0409] As an embodiment, step S5105 relies on non-RACH LTM cell switching being performed.

[0410] As an embodiment, the first node U01 monitors the PDCCH during the active time of the MAC sublayer.

[0411] As an embodiment, the first node U01 is required to monitor the PDCCH during the active time of the MAC sublayer.

[0412] As an embodiment, the first node U01 is required to monitor the PDCCH only during the active time of the MAC sublayer.

[0413] As an embodiment, the active time of the MAC sublayer includes the time when non-RACH LTM cell switching is in progress.

[0414] As an embodiment, the active time of the MAC sublayer is the active time of the MAC or the active time of the MAC entity.

[0415] As an embodiment, the MAC sublayer of the present application refers to the MAC sublayer that receives the first signaling.

[0416] As an embodiment, the MAC sublayer of the present application refers to the MAC sublayer associated with the first signaling.

[0417] As an embodiment, when non-RACH LTM cell switching is not in progress, the MAC sublayer of the first node U01 is not in active time.

[0418] As an embodiment, when non-RACH LTM cell switching is not in progress, the MAC sublayer of the first node U01 is not in active time when no other events that can be determined as active time are in progress.

[0419] As an embodiment, the above method has the following benefits: timely determining that non-RACH LTM cell switching is not in progress, which is beneficial to stop monitoring PDCCH, thereby facilitating power saving.

[0420] As an embodiment, step S5105 is continuously performed until it is no longer required to monitor the PDCCH position.

[0421] As an embodiment, step S5106 is an event rather than an action taken by the first node U01, that is, the first node U01 does not trigger or cause the first timer to expire, and the first timer will automatically expire after the predetermined time is reached after it is started.

[0422] As an embodiment, in step S5105, the PDCCH monitored by the first node U01 is the PDCCH of the target cell.

[0423] As an embodiment, in step S5105, the PDCCH monitored by the first node U01 is the PDCCH configured by the first candidate configuration.

[0424] As an embodiment, expiration of the first timer triggers step S5107.

[0425] As an embodiment, the expiration of the first timer is used to determine that non-RACH LTM cell switching is not in progress.

[0426] As an embodiment, step S5108 includes sending an RRC reconstruction request message, receiving an RRC reconstruction message, and sending an RRC reconstruction completion message.

[0427] As a sub-embodiment of this embodiment, the three messages of this embodiment are all RRC messages.

[0428] As an embodiment, step S5108 includes the RRC sublayer instructing the MAC sublayer to perform a MAC sublayer reset.

[0429] As a sub-embodiment of this embodiment, the MAC sublayer reset includes or triggers the MAC sublayer to determine that non-RACH LTM cell switching is not in progress.

[0430] As an embodiment, step S5108 is executed before step S5107.

[0431] As an embodiment, step S5108 is executed after step S5106.

[0432] As an embodiment, step S5108 includes cell selection.

[0433] As a sub-embodiment of this embodiment, the cell selected by the cell selection is a cell configured by one of the at least one candidate configuration, and step S5108 includes or triggers the application of the one of the at least one candidate configuration.

[0434] As a sub-embodiment of this embodiment, the cell selected by the cell selection is not a cell configured by any candidate configuration in the at least one candidate configuration, and the first node U01 sends an RRC re-establishment request message.

[0435] As a sub-embodiment of this embodiment, the cell selected by the cell selection is not a cell configured by any candidate configuration in the at least one candidate configuration, and the SRB and the DRB are suspended.

[0436] As a sub-embodiment of this embodiment, the cell selected by the cell selection is not a cell configured by any candidate configuration in the at least one candidate configuration, and the SCG is released.

[0437] As a sub-embodiment of this embodiment, one candidate configuration among the at least one candidate configuration is the first candidate configuration.

[0438] As a sub-embodiment of this embodiment, accompanying the applying of one of the at least one candidate configuration, a RACH-based LTM cell switching is performed.

[0439] As a sub-embodiment of this embodiment, when the cell selected by the cell selection is a cell configured by one of the at least one candidate configurations, step S5108 includes or triggers the execution of LTM cell switching.

[0440] As a sub-embodiment of this embodiment, when the cell selected by the cell selection is a cell configured by one of the at least one candidate configurations, the first node U01 does not send an RRC re-establishment request.

[0441] As a sub-embodiment of this embodiment, the first node U01 performs LTM cell switching in response to the cell selected by the cell selection being a cell configured by one of the at least one candidate configurations.

[0442] As a sub-embodiment of this embodiment, the performing of LTM cell switching is performing RACH-based LTM cell switching.

[0443] As a sub-embodiment of this embodiment, the performing of LTM cell switching includes initiating random access.

[0444] As a sub-embodiment of this embodiment, the execution of LTM cell switching includes the RRC layer instructing the MAC sublayer to initiate random access.

[0445] As a sub-embodiment of this embodiment, the performing of LTM cell switching includes starting a first timer.

[0446] As a sub-embodiment of this embodiment, the performing of LTM cell switching includes the RRC sublayer instructing the MAC sublayer to perform a MAC sublayer reset.

[0447] As a sub-embodiment of this embodiment, the performing of LTM cell switching includes applying the first candidate configuration.

[0448] As an embodiment, when the cell selected by the cell selection is a response to a cell configured by one of the at least one candidate configurations, performing LTM cell switching instead of sending an RRC reconstruction request message is beneficial to reducing interruptions and ensuring the continuity of data communications.

[0449] Example 6

[0450] Embodiment 6 illustrates a flowchart of the interaction between the MAC sublayer and the RRC sublayer according to an embodiment of the present application, as shown in the attached figure. Figure 6 Attached Figure 6 In the example, U11 corresponds to the MAC sublayer of the first node of the present application, and U12 corresponds to the RRC sublayer of the first node of the present application. It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in the present application; Figure 6 The solid line with an arrow in the figure represents an instruction sent by the MAC sublayer to the RRC sublayer, or an instruction sent by the RRC sublayer to the MAC sublayer; Figure 6 The dashed line with an arrow in the figure represents a candidate implementation method. Embodiment 6 is a useful supplement to Embodiment 5, and also a more explicit description of which of Embodiment 5 is implemented in the RRC sublayer and which is implemented in the MAC sublayer.

[0451] for MAC sublayer U11 , receiving the first signaling in step S6101; resetting the MAC sublayer in step S6102; determining in step S6103 that a non-RACH LTM cell switching is in progress at the MAC sublayer; monitoring the PDCCH in step S6104; and determining in step S6105 that a non-RACH LTM cell switching is not in progress at the MAC sublayer.

[0452] for RRC sublayer U12 , receiving at least one candidate configuration in step S6201; applying the first candidate configuration in the RRC sublayer in step S6202; the first timer expires in step S6203; and initiating RRC connection reconstruction in step S6204.

[0453] As an example, Figure 6 The order of the serial numbers in is the order of implementation.

[0454] As an embodiment, in response to receiving the first signaling, the MAC sublayer U11 indicates to the RRC sublayer U12 that the LTM cell switching is triggered.

[0455] As an embodiment, upon receiving an indication from the MAC sublayer U11 that the LTM cell switching is triggered, the RRC sublayer U12 performs the LTM cell switching.

[0456] As an embodiment, the RRC sublayer U12 performing LTM cell switching is the part related to the RRC sublayer U12 in the RRC sublayer U12 performing LTM cell switching.

[0457] As an embodiment, performing LTM cell switching in the RRC sublayer U12 includes executing step S6202.

[0458] As an embodiment, performing LTM cell switching at the RRC sublayer U12 includes instructing the MAC sublayer to perform a MAC sublayer reset.

[0459] As an embodiment, the MAC sublayer U11, in response to receiving an indication of MAC sublayer reset from the RRC sublayer U12, performs a MAC sublayer reset.

[0460] As an embodiment, after step S6102, the MAC sublayer U11 determines that a non-RACH LTM cell handover is in progress.

[0461] As an embodiment, the RRC sublayer U12 further indicates to the MAC sublayer that the UE-based timing advance is configured when performing LTM cell switching.

[0462] As an embodiment, when non-RACH LTM cell handover is in progress, the first node is required to monitor the PDCCH.

[0463] As a sub-embodiment of this embodiment, the monitoring of PDCCH is monitoring the PDCCH of the target cell.

[0464] As a sub-embodiment of this embodiment, the monitoring of PDCCH is monitoring the PDCCH (physical downlink control channel) of the cell configured by the first candidate configuration.

[0465] As an embodiment, step S6104 is controlled and executed by the MAC sublayer U11. Those skilled in the art should understand that monitoring the PDCCH also requires the participation of the physical layer.

[0466] As an embodiment, step S6202 includes starting a first timer.

[0467] As an embodiment, in step S6203, the first timer expires.

[0468] As an embodiment, step S6203 occurs after step S6103.

[0469] As an embodiment, step S6203 occurs after step S6104.

[0470] As an embodiment, step S6203 occurs after the start of step S6104.

[0471] As an embodiment, the event of expiration of the first timer in step S6203 does not mean that the RRC sublayer U12 interferes with the operation of the first timer or causes the expiration of the first timer.

[0472] As an embodiment, expiration of the first timer triggers step S6105.

[0473] As an embodiment, the expiration of the first timer triggers step S6105 including: the RRC sublayer U12 explicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress.

[0474] As an embodiment, the expiration of the first timer triggers step S6105 including: the RRC sublayer U12 instructs the MAC sublayer to reset the MAC sublayer.

[0475] As a sub-embodiment of this embodiment, the MAC sublayer resetting includes determining that non-RACH LTM cell switching is not in progress.

[0476] As an embodiment, the expiration of the first timer triggers step S6105, including: the RRC sublayer U12 indicates the first configuration information of the MAC sublayer, and the first configuration information triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress.

[0477] As an embodiment, the meaning of determining that the non-RACH LTM cell switching is not in progress includes: stopping the ongoing non-RACH LTM cell switching.

[0478] As an embodiment, the meaning of determining that the non-RACH LTM cell handover is not in progress includes: not considering that the non-RACH LTM cell handover is in progress.

[0479] As an embodiment, the meaning of determining that the non-RACH LTM cell handover is not in progress includes: considering that the non-RACH LTM cell handover is not in progress.

[0480] As an embodiment, the meaning of determining that non-RACH LTM cell switching is not in progress includes: setting that non-RACH LTM cell switching is not in progress.

[0481] As an embodiment, the meaning of determining that non-RACH LTM cell switching is not in progress includes: clearing non-RACH LTM cell switching.

[0482] As an embodiment, the meaning of determining that the non-RACH LTM cell handover is not in progress includes: clearing the ongoing non-RACH LTM cell handover.

[0483] As an embodiment, step S6203 triggers step S6204.

[0484] As an embodiment, step S6204 is performed earlier than step S6105.

[0485] As an embodiment, step S6204 includes indicating a MAC sublayer reset to the MAC sublayer.

[0486] As an embodiment, step S6204 is performed later than step S6105.

[0487] Example 7

[0488] Embodiment 7 illustrates a schematic diagram of the first signaling according to an embodiment of the present application, as shown in the attached Figure 7 shown.

[0489] As an embodiment, the first signaling is a MAC CE including at least one 8-bit group.

[0490] As an embodiment, the at least one 8-bit group includes 7 8-bit groups.

[0491] As an embodiment, the at least one 8-bit group includes 8 8-bit groups.

[0492] As an embodiment, the at least one 8-bit group includes 9 8-bit groups.

[0493] As an embodiment, the name of the first signaling is LTM cell switching command.

[0494] As an embodiment, the name of the first signaling is enhanced LTM cell switching command.

[0495] As an embodiment, the name of the first signaling is the extended LTM cell switching command.

[0496] As an embodiment, the first signaling includes an attached Figure 7 All fields shown in .

[0497] As an embodiment, the first signaling includes an attached Figure 7 At least one field other than R shown in .

[0498] As an example, Figure 7 The R field in indicates a reserved field.

[0499] As an example, Figure 7 The C field in indicates whether the first signaling includes contention-free random access resources.

[0500] As an embodiment, the contention-free random access resource refers to the content indicated by the S / U field, the Random Access Preamble Index field, the SS / PBCH index field, and the PRACH Mask index field.

[0501] As a sub-embodiment of this embodiment, if the first signaling does not include contention-free random access resources, then the first signaling does not include the above-mentioned field.

[0502] As an example, Figure 7 The S / U field in indicates the uplink carrier used for the physical layer random access channel.

[0503] As an example, Figure 7 The Target Config ID field in indicates one of the at least one candidate configuration.

[0504] As an example, Figure 7 The Target Config ID field in indicates an identifier of a candidate configuration in the at least one candidate configuration.

[0505] As an example, Figure 7 The Target Config ID field in indicates the identifier of the candidate configuration in the at least one candidate configuration minus 1.

[0506] As an example, Figure 7 The value of the Target Config ID field in plus 1 is equal to the identifier of the candidate configuration in the at least one candidate configuration to be indicated.

[0507] As an example, Figure 7 The Timing Advance Command field in indicates the timing advance.

[0508] As an example, Figure 7The Timing Advance Command field in the LTM field indicates whether the timing advance for the LTM target cell is valid.

[0509] As an example, when the attached Figure 7 When the value of the Timing Advance Command field in the LTM target cell is equal to FFF, it indicates that the timing advance of the LTM target cell is invalid.

[0510] As an example, when the attached Figure 7 When the value of the Timing Advance Command field in is not equal to FFF, the first node is allowed to use non-RACH LTM cell switching.

[0511] As an example, when the attached Figure 7 When the value of the Timing Advance Command field in is equal to FFF and the UE-based timing advance is configured, the first node is allowed to use non-RACH LTM cell switching.

[0512] As an example, Figure 7 The TCI state ID field in indicates and activates the TCI state of the LTM target cell.

[0513] As an example, Figure 7 The UL TCI state ID field in indicates and activates the uplink TCI state of the LTM target cell.

[0514] As an example, Figure 7 The Random Access Preamble Index field in indicates the random access preamble index.

[0515] As an example, Figure 7 The SS / PBCH index field in is used to indicate the random access channel opportunity associated with the indicated SS / PBCH.

[0516] As an example, Figure 7 The PRACH Mask index field in indicates the mask of PRACH (physical random access channel).

[0517] As an embodiment, what is a PRACH mask, what is a PRACH timing, what is a TCI state, and what is a random access preamble are the prior art in this field.

[0518] As an embodiment, the association relationship between SS / PBCH and PRACH is fixed or configured by the network.

[0519] As a sub-embodiment of this embodiment, the at least one candidate configuration includes an association relationship between the SS / PBCH of the cell configured by the candidate configuration and the PRACH or random access channel opportunity of this cell.

[0520] As an embodiment, the first signaling includes a first field, and the first field indicates whether the LTM cell switching is for MCG or SCG.

[0521] As an embodiment, the first signaling includes a first field, and the first field indicates whether the LTM cell switching is for PCell or PSCell.

[0522] As an embodiment, the benefit of the above method is increased flexibility.

[0523] As an embodiment, the first signaling includes a second field, the second field indicates a first reference signal resource, the first reference signal resource is a reference signal resource other than SS / PBCH, and the random access resource indicated by the first signaling is associated with the first reference signal resource.

[0524] As a sub-embodiment of this embodiment, the first reference signal resource is a CSI-RS (channel state information-reference signal).

[0525] As an embodiment, the above method has the advantage of increased flexibility and is not restricted by SS / PBCH.

[0526] As an embodiment, the first signaling includes a third field, and the third resource indicates uplink transmission power.

[0527] As a sub-embodiment of this embodiment, the uplink transmission power is the uplink transmission power of the random access signal.

[0528] As an embodiment, the advantage of the above method is that the uplink transmission power can be determined more accurately to ensure the communication quality.

[0529] As an embodiment, the first signaling includes a fourth field, and the fourth field indicates sending a scheduling request.

[0530] As an embodiment, the fourth field indicates sending a scheduling request in the target cell.

[0531] As an embodiment, the fourth field indicates that the scheduling request is sent regardless of whether there is data to be transmitted.

[0532] As an embodiment, the advantage of the above method is that it can shorten the delay of LTM cell switching.

[0533] As an embodiment, the first signaling includes a fifth field, and the fifth field indicates a PUCCH resource.

[0534] As a sub-embodiment of this embodiment, the PUCCH resource is a PUCCH resource of the target cell.

[0535] As an embodiment, the advantage of the above method is that it can more effectively control and indicate PUCCH resources and reduce the delay of LTM cell switching.

[0536] As an embodiment, the first signaling includes a sixth field, and the sixth field indicates whether to release the candidate configuration indicated by the first signaling.

[0537] As an embodiment, the above method has the advantage of avoiding misoperation and reducing the complexity of implementation.

[0538] As an embodiment, the first signaling includes a seventh field, and the seventh field indicates to use RACH-based LTM cell switching after the second timer expires.

[0539] As an embodiment, the first signaling includes a seventh field, and the seventh field indicates that random access is initiated after the second timer expires.

[0540] As a sub-embodiment of this embodiment, the random access is for LTM cell switching.

[0541] As an embodiment, the second timer is a timer of the MAC sublayer.

[0542] As an embodiment, the first candidate configuration includes the configuration of the second timer.

[0543] As an embodiment, the value of the second timer is limited.

[0544] As an embodiment, the above method has the advantages of ensuring the continuity of communication and improving the success rate of LTM cell switching.

[0545] As an embodiment, any one of the first field, the second field, the third field, the fourth field, the fifth field, the sixth field, and the seventh field may use an additional field. Figure 7 One or more R fields in .

[0546] As an example, Figure 7 One or more R fields are used for at least one of the first field, the second field, the third field, the fourth field, the fifth field, the sixth field, and the seventh field. At this time, the names of the one or more R fields will be adjusted accordingly and will no longer be named R fields.

[0547] Example 8

[0548] Embodiment 8 illustrates a schematic diagram of monitoring a PDCCH-dependent non-RACH LTM cell switching in a measurement gap according to an embodiment of the present application, as shown in the attached figure. Figure 8 shown.

[0549] As an embodiment, the measurement gap is a gap configured for measurement, especially inter-frequency measurement. Generally, the measurement gap is configured as a discontinuous time window that appears periodically. The measurement gap is configured because the terminal cannot simultaneously receive and / or transmit on the frequency of the current cell and the frequency to be measured. Therefore, after the measurement gap is configured, in order to ensure the measurement, under normal circumstances, the terminal is not required to monitor the PDCCH within the measurement gap, and does not communicate on the frequency of the current cell.

[0550] As an embodiment, the meaning of monitoring PDCCH in the measurement gap that non-RACH-dependent LTM cell switching is in progress includes: when non-RACH LTM cell switching is in progress, the first node needs to monitor PDCCH in the measurement gap.

[0551] As a sub-embodiment of this embodiment, the MAC of the first node associated with the first signaling needs to monitor the PDCCH within the measurement gap.

[0552] As a sub-embodiment of this embodiment, the first node cannot perform inter-frequency measurement within the measurement gap.

[0553] As a sub-embodiment of this embodiment, the first node is unable to perform all configured measurements within the measurement gap.

[0554] As a sub-embodiment of this embodiment, the MAC of the first node associated with the first signaling is unable to perform all configured measurements within the measurement gap.

[0555] As an embodiment, the MAC of the first node associated with the first signaling refers to a MAC entity that receives the first signaling.

[0556] As an embodiment, when there is only one cell group, the first node has only one MAC entity.

[0557] As an embodiment, the monitoring of PDCCH in the measurement gap depending on the fact that non-RACH LTM cell switching is in progress means that: when non-RACH LTM cell switching is in progress, the first node is required to monitor PDCCH in the measurement gap.

[0558] As an embodiment, the meaning of monitoring the ongoing PDCCH-dependent non-RACH LTM cell switching within the measurement gap includes: when the non-RACH LTM cell switching is in progress, the network can schedule the first node within the measurement gap.

[0559] As an embodiment, the meaning of monitoring the ongoing PDCCH-dependent non-RACH LTM cell switching in the measurement gap includes: when the non-RACH LTM cell switching is in progress, the network can indicate uplink grant to the first node in the measurement gap.

[0560] As an embodiment, the monitoring of PDCCH in the measurement gap depending on the ongoing non-RACH LTM cell switching means that: when the non-RACH LTM cell switching is not in progress, the first node is not required to monitor PDCCH in the measurement gap.

[0561] As an embodiment, the meaning of monitoring PDCCH in the measurement gap that non-RACH-dependent LTM cell switching is in progress includes: when non-RACH LTM cell switching is not in progress, the first node may not monitor PDCCH in the measurement gap.

[0562] As an embodiment, the meaning of monitoring that a PDCCH-dependent non-RACH LTM cell switching is in progress in the measurement gap includes: when the non-RACH LTM cell switching is not in progress, the first node performs measurement in the measurement gap.

[0563] As an embodiment, the meaning of monitoring the ongoing PDCCH-dependent non-RACH LTM cell switching in the measurement gap includes: when the non-RACH LTM cell switching is not in progress, the first node performs inter-frequency measurement in the measurement gap.

[0564] As an embodiment, the meaning of monitoring that a PDCCH-dependent non-RACH LTM cell switching is in progress in the measurement gap includes: when the non-RACH LTM cell switching is not in progress, the first node supports performing any configured measurement in the measurement gap.

[0565] As an embodiment, when non-RACH LTM cell switching is in progress, monitoring the PDCCH in the measurement gap is beneficial to shorten the delay of the LTM cell switching as much as possible.

[0566] As an embodiment, timely determining that non-RACH LTM cell switching is not in progress is conducive to ensuring measurement; the mobility of the terminal, such as switching to an inter-frequency cell, depends on the measurement of the inter-frequency.

[0567] Example 9

[0568] Embodiment 9 illustrates a schematic diagram of triggering the MAC sublayer to determine that non-RACH LTM cell switching is not in progress according to the first configuration information of an embodiment of the present application, as shown in the attached Fig. 9 shown.

[0569] As an embodiment, the first configuration information is indicated by the RRC sublayer of the first node to the MAC sublayer of the first node.

[0570] As an embodiment, the reception of the first configuration information triggers the MAC sublayer to determine that non-RACH LTM cell switching is no longer in progress.

[0571] As an embodiment, the application of the first configuration information triggers the MAC sublayer to determine that non-RACH LTM cell switching is no longer in progress.

[0572] As an embodiment, the completion application of the first configuration information triggers the MAC sublayer to determine that non-RACH LTM cell switching is no longer in progress.

[0573] As an embodiment, the first configuration information is for LTM.

[0574] As an embodiment, the first configuration information includes not configuring or not using UE-based timing advance.

[0575] As an embodiment, the first configuration information includes RACH configuration information.

[0576] As an embodiment, the first configuration information includes configuring the use of RACH-based LTM cell switching.

[0577] As an embodiment, the first configuration information includes configuration information of a contention-free RACH.

[0578] As an embodiment, the first configuration information includes a configuration indicating the release of the target cell.

[0579] As an embodiment, the first configuration information includes an indication of a target cell change.

[0580] As an embodiment, the first configuration information includes a PDCCH and / or a PUCCH indicating the release of the target cell.

[0581] As an embodiment, the first configuration information includes measurement configuration information.

[0582] As a sub-embodiment of this embodiment, the measurement configuration information includes configuration of measurement for LTM.

[0583] As a sub-embodiment of this embodiment, the measurement configuration information includes measurement configuration of L1.

[0584] As a sub-embodiment of this embodiment, the measurement configuration information includes report configuration.

[0585] As an embodiment, the first configuration information includes configuring condition-based LTM cell switching.

[0586] As an embodiment, the first configuration information includes changing the MCG.

[0587] As a sub-embodiment of this embodiment, the first signaling is directed to MCG.

[0588] As a sub-embodiment of this embodiment, the first signaling is for PCell.

[0589] As a sub-embodiment of this embodiment, the first signaling is received by a MAC entity of the MCG.

[0590] As an embodiment, the first configuration information includes deactivating SCG.

[0591] As a sub-embodiment of this embodiment, the first signaling is directed to the SCG.

[0592] As a sub-embodiment of this embodiment, the first signaling is for PSCell.

[0593] As a sub-embodiment of this embodiment, the first signaling is received by a MAC entity of the SCG.

[0594] As an embodiment, using the first configuration information is helpful to timely determine that non-RACH LTM cell switching is no longer in progress, thereby saving more power, performing more accurate measurements, and avoiding misoperation.

[0595] Example 10

[0596] Embodiment 10 illustrates a structural block diagram of a processing device used in a first node according to an embodiment of the present application; Fig.10 As shown in the attached Fig.10 In the embodiment, the processing device 1000 in the first node includes a first receiver 1001 and a first transmitter 1002.

[0597] In embodiment 10, the first processor 1003 receives at least one candidate configuration, any candidate configuration in the at least one candidate configuration includes an RRC reconfiguration message; receives a first signaling, the first signaling is a MAC CE; the first signaling indicates a first candidate configuration in the at least one candidate configuration; as a response to receiving the first signaling, determines at the MAC sublayer that a non-RACH LTM cell handover is in progress, and applies the first candidate configuration at the RRC sublayer, wherein the applying the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer is a timer of the RRC sublayer; and determines at the MAC sublayer that the non-RACH LTM cell handover is not in progress;

[0598] Among them, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; and monitoring PDCCH within a measurement gap that the non-RACH LTM cell switching is in progress.

[0599] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depending on the expiration of the first timer includes: the RRC sublayer of the first node explicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0600] As an embodiment, the determination at the MAC sublayer that the non-RACH LTM cell switch is no longer in progress depends on the expiration of the first timer, including: the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switch is no longer in progress.

[0601] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, and the MAC sublayer reset of the first node includes determining that the non-RACH LTM cell switching is no longer in progress.

[0602] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is no longer in progress, including: the RRC sublayer of the first node indicates that the MAC sublayer is reset, the MAC sublayer reset of the first node triggers the expiration of the timing advance timer, and the expiration of the timing advance timer triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress.

[0603] As an embodiment, the first processor 1003, in response to expiration of the first timer, initiates RRC connection reconstruction, which includes applying the first candidate configuration; accompanied by applying the first candidate configuration, performing RACH-based LTM cell switching.

[0604] As an embodiment, the first processor 1003 monitors the PDCCH during the active time of the MAC sublayer;

[0605] The active time of the MAC sublayer includes the time when non-RACH LTM cell switching is in progress.

[0606] As an embodiment, expiration of the first timer triggers the MAC sublayer to determine that UE-based timing advance measurement is not configured.

[0607] As an embodiment, the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates first configuration information to the MAC sublayer, and the first configuration information triggers the MAC sublayer to determine that the non-RACH LTM cell switching is not in progress.

[0608] As an embodiment, the first receiver 1001 includes at least one of the antenna 452, receiver 454, receiving processor 456, multi-antenna receiving processor 458, controller / processor 459, memory 460, or data source 467 in Example 4.

[0609] As an embodiment, the first transmitter 1002 includes at least one of the antenna 452, transmitter 454, transmit processor 468, multi-antenna transmit processor 457, controller / processor 459, memory 460, or data source 467 in Embodiment 4.

[0610] A person of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of software and hardware combination. The user equipment, terminal and UE in the present application include but are not limited to drones, communication modules on drones, remote-controlled aircraft, aircraft, small aircraft, mobile phones, tablet computers, notebooks, vehicle-mounted communication equipment, wireless sensors, Internet cards, Internet of Things terminals, RFID terminals, NB-IoT terminals, MTC (Machine Type Communication, machine type communication) terminals, eMTC (enhancedMTC, enhanced MTC) terminals, data cards, Internet cards, vehicle-mounted communication equipment, low-cost mobile phones, low-cost tablet computers, satellite communication equipment, ship communication equipment, NTN user equipment and other wireless communication equipment. The base stations or system equipment in this application include but are not limited to macrocell base stations, microcell base stations, home base stations, relay base stations, gNB (NR Node B) NR Node B, TRP (Transmitter Receiver Point, sending and receiving node), NTN base stations, satellite equipment, flight platform equipment and other wireless communication equipment.

[0611] The present invention may be implemented in other specified forms without departing from its core or essential features. Therefore, the embodiments disclosed herein should be considered as illustrative rather than restrictive in any way. The scope of the invention is determined by the appended claims rather than the preceding description, and all modifications within their equivalent meanings and regions are considered to be included therein.

Claims

1. A first node for layer 1 and layer 2 triggered mobility management in wireless communication, wherein: include: A first processor receives at least one candidate configuration, any candidate configuration of the at least one candidate configuration including an RRC reconfiguration message; receiving a first signaling, where the first signaling is a MAC CE; The first signaling indicates a first candidate configuration among the at least one candidate configuration; In response to receiving the first signaling, determining at the MAC sublayer that a non-RACH LTM cell handover is in progress, and applying the first candidate configuration at the RRC sublayer, wherein applying the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer being a timer of the RRC sublayer; determining at the MAC sublayer that the non-RACH LTM cell handover is not in progress; Among them, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; and monitoring PDCCH within a measurement gap that the non-RACH LTM cell switching is in progress.

2. The first node according to claim 1, characterized in that: The determining at the MAC sublayer that the non-RACH LTM cell switching is not in progress depending on the expiration of the first timer includes: the RRC sublayer of the first node explicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress.

3. The first node according to claim 1, characterized in that: The determining at the MAC sublayer that the non-RACH LTM cell switching is not in progress relying on the expiration of the first timer includes: the RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress.

4. The first node according to claim 3, characterized in that: The RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates the MAC sublayer reset, and the MAC sublayer reset of the first node includes determining that the non-RACH LTM cell switching is not in progress.

5. The first node according to claim 3 or 4, characterized in that: The RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates the MAC sublayer reset, the MAC sublayer reset of the first node triggers the expiration of the timing advance timer, and the expiration of the timing advance timer triggers the MAC sublayer to determine that the non-RACH LTM cell switching is no longer in progress.

6. The first node according to any one of claims 1 to 5, characterized in that: include: The first processor, in response to expiration of the first timer, initiating RRC connection reestablishment, including applying the first candidate configuration; Accompanying the applying of the first candidate configuration, performing RACH-based LTM cell switching.

7. The first node according to any one of claims 1 to 6, characterized in that: include: The first processor monitors the PDCCH during the active time of the MAC sublayer; The active time of the MAC sublayer includes the time when non-RACH LTM cell switching is in progress.

8. The first node according to any one of claims 1 to 7, characterized in that: Expiration of the first timer triggers the MAC sublayer to determine that UE-based timing advance measurement is not configured.

9. The first node according to any one of claims 1 to 8, characterized in that: The RRC sublayer of the first node implicitly indicates to the MAC sublayer that the non-RACH LTM cell switching is not in progress, including: the RRC sublayer of the first node indicates first configuration information to the MAC sublayer, and the first configuration information triggers the MAC sublayer to determine that the non-RACH LTM cell switching is not in progress.

10. A method in a first node for layer 1 and layer 2 triggered mobility management in wireless communications, wherein: include: Receiving at least one candidate configuration, any candidate configuration of the at least one candidate configuration comprising an RRC reconfiguration message; receiving a first signaling, where the first signaling is a MAC CE; The first signaling indicates a first candidate configuration among the at least one candidate configuration; In response to receiving the first signaling, determining at the MAC sublayer that a non-RACH LTM cell handover is in progress, and applying the first candidate configuration at the RRC sublayer, wherein applying the first candidate configuration at the RRC sublayer includes: starting a first timer, the first timer being a timer of the RRC sublayer; determining at the MAC sublayer that the non-RACH LTM cell handover is not in progress; Among them, the determination at the MAC sublayer that the non-RACH LTM cell switching is no longer in progress depends on the expiration of the first timer; the first candidate configuration includes a synchronous reconfiguration of a special cell for the first node; and whether monitoring PDCCH within the measurement gap depends on the non-RACH LTM cell switching being in progress.

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