Method and apparatus in communication node used for wireless communication

Abstract

The invention discloses a method and an apparatus in a communication node used for wireless communication. The communication node receives the first RRC message; the first RRC message comprises configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first service cell; receiving a first MAC CE; the first MAC CE indicates the first candidate cell; performing a handover process as a response to receiving the first MAC CE; the switching process is free from random access; the random access-free dependence of the switching process is at least that a time interval between a first moment and a second moment is not greater than a first time threshold value; the first instant is related to a UE-based timing advance for the first candidate cell. According to the scheme provided by the invention, the random access-free robustness in the switching process is improved, and the probability of switching failure is reduced.

Description

Technical Field

[0001] The present application relates to a transmission method and apparatus in a wireless communication system, and more particularly to a method and apparatus for verifying the validity of a timing advance measurement based on a UE. Background Art

[0002] With the continuous development of wireless communications, the requirements for mobility, transmission delay and system capacity are getting higher and higher. 3GPP has completed the standardization of L1 (Layer 1, Layer 1) / L2 (Layer 2, Layer 2) triggered mobility (L1 / L2 Triggered Mobility, LTM) through the "NR (New Radio) Further NR mobility enhancements" research project (Work Item, WI); to further enhance mobility, conditional LTM or inter-CU LTM has become an important research content of 3GPP Release 19.

[0003] To enhance the LTM process, LTM supports UE-based timing advance measurement. The UE measures the downlink receive timing difference between the serving cell and the LTM candidate cell and the uplink timing advance of the serving cell to derive the uplink timing advance of the LTM candidate cell. In order to improve the robustness of LTM early synchronization, it is necessary to improve the validity verification of UE-based timing advance measurement in LTM; in addition, considering that UE-based timing advance measurement can significantly reduce the signaling overhead during the switching process, applying early uplink synchronization to conditional LTM or inter-CU LTM or CHO or CPC has a good standardization prospect. Summary of the invention

[0004] The inventors have found through research that in the existing LTM UE-based timing advance measurement process, the TA of the candidate cell is obtained by the downlink reception timing difference measured by the source cell TA and the UE. The existing UE-based timing advance measurement validity verification mechanism is still imperfect. Before the candidate cell TA is applied, the TA validity verification is not performed or implemented by the UE. When or after the candidate cell TA is applied, if the candidate cell TA fails due to position movement or wireless path change, it may cause the first uplink transmission failure on the candidate cell and reduce the robustness of the LTM process. Therefore, it is necessary to enhance the validity verification of the UE-based timing advance measurement.

[0005] In view of the above problems, the present application provides a solution. In the description of the above problems, the NR system is used as an example. The present application is also applicable to scenarios such as LTE (Long-Term Evolution) or LTE-A (Long-Term Evolution Advanced) or future 6G systems, and achieves technical effects similar to those of the NR system; further, although the present application provides a specific implementation method for the 3GPP system, the present application can also be used in scenarios of non-3GPP systems to achieve technical effects similar to those of the 3GPP system. Furthermore, adopting a unified design scheme for different scenarios can also help reduce hardware complexity and cost. Furthermore, although the original intention of the present application is for the Uu air interface, the present application can also be used for the PC5 port to achieve technical effects similar to those of the Uu air interface. Furthermore, although the original intention of the present application is for LTM, the present application can also be used for conditional LTM or continuous LTM or SCPAC or CHO or CPC, etc., to achieve technical effects similar to those of LTM. Furthermore, although the original intention of this application is for the terminal and base station scenario, this application is also applicable to the V2X (Vehicle-to-Everything) scenario, the communication scenario between the terminal and the relay, and the relay and the base station, to achieve similar technical effects in the terminal and base station scenario. Further, although the original intention of this application is for the terminal and base station scenario, this application is also applicable to the IAB (Integrated Access and Backhaul) communication scenario, to achieve similar technical effects in the terminal and base station scenario. Further, although the original intention of this application is for the terrestrial network (Terrestrial Network, TN) scenario, this application is also applicable to the non-terrestrial network (Non-Terrestrial Network, NTN) communication scenario, to achieve similar technical effects in the TN scenario. In addition, the use of a unified solution for different scenarios also helps to reduce hardware complexity and cost.

[0006] As an embodiment, the interpretation of the terminology in the present application refers to the definition of the 3GPP specification protocol TS36 series.

[0007] As an example, the interpretation of the terms in the present application refers to the definition of the TS38 series of specification protocols of 3GPP.

[0008] As an example, the interpretation of the terms in the present application refers to the definition of the TS37 series of specification protocols of 3GPP.

[0009] 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.

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

[0011] Receive a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; receive a first MACCE; wherein the first MAC CE indicates the first candidate cell; as a response to receiving the first MAC CE, perform a handover process; wherein the handover process is free of random access;

[0012] Among them, the random access-free switching process relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0013] As an embodiment, the problems to be solved by the present application include: how to enhance the validity verification of the timing advance measurement process based on the UE in the LTM, and how to make the TA of the candidate cell based on the timing advance of the UE more robust.

[0014] As an embodiment, the problem to be solved by the present application includes: how to verify the TA of the candidate cell at different stages of RACH-less LTM.

[0015] As an embodiment, the problem to be solved by the present application includes: how to design a fallback mechanism after the TA of the candidate cell fails to reduce the probability of handover failure.

[0016] As an embodiment, the problem to be solved by the present application includes: how to realize the release of the radio resources reserved by the candidate cell through the design of validity verification based on the timing advance measurement of the UE.

[0017] As an embodiment, the characteristics of the above method include: the switching process is free of random access and relies on at least the time interval between the first moment and the second moment being no greater than a first time threshold.

[0018] As an embodiment, the characteristics of the above method include: the first MAC CE does not indicate the effective timing advance of the first candidate cell.

[0019] As an embodiment, the benefits of the above method include: it is helpful to improve the robustness of the switching process without random access and reduce the probability of switching failure.

[0020] As an embodiment, the benefits of the above method include: after determining whether the candidate cell TA is valid, if the TA is invalid, it is beneficial for the network to release the reserved wireless connection resources in advance.

[0021] As an embodiment, the benefits of the above method include: being helpful in improving the accuracy and effectiveness of the candidate cell TA used.

[0022] As an embodiment, the benefits of the above method include: it is helpful to reduce signaling interaction.

[0023] According to one aspect of the present application, it is characterized in that the first moment is the moment when the downlink reception timing difference between the first candidate cell and the first serving cell is measured; and the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

[0024] As an embodiment, the benefits of the above method include: being helpful in improving the accuracy of the candidate cell TA obtained based on the timing advance measurement of the UE.

[0025] As an embodiment, the benefits of the above method include: it is helpful to reduce signaling interaction.

[0026] According to one aspect of the present application, it is characterized by comprising:

[0027] At the first moment, starting or restarting a first timer;

[0028] The fact that the time interval between the first moment and the second moment is not greater than the first time threshold means that the first timer is running.

[0029] As an embodiment, the benefits of the above method include: being beneficial to the maintenance of the candidate cell TA.

[0030] As an embodiment, the benefits of the above method include: being conducive to triggering a downlink reception timing difference between the first candidate cell and the first serving cell.

[0031] According to one aspect of the present application, it is characterized in that it includes:

[0032] receiving a first signaling; and stopping the first timer in response to the first signaling being received;

[0033] The first signaling indicates stopping the measurement of the UE-based timing advance for the first candidate cell.

[0034] As an embodiment, the benefits of the above method include: facilitating the network to terminate the UE-based timing advance measurement.

[0035] As an embodiment, the benefits of the above method include: facilitating the fallback from RACH-less LTM to RACH-based LTM.

[0036] As an embodiment, the benefits of the above method include: it is beneficial for the network to release reserved wireless resources in advance.

[0037] As an embodiment, the benefits of the above method include: it is helpful to improve the robustness of the LTM process.

[0038] According to one aspect of the present application, it is characterized by comprising:

[0039] In response to a difference between the first RSRP and the second RSRP being greater than a first RSRP threshold, stopping the first timer;

[0040] The first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0041] As an embodiment, the benefits of the above method include: being conducive to monitoring the quality of wireless links of candidate cells.

[0042] As an embodiment, the benefits of the above method include: it is helpful to improve the robustness of the LTM process.

[0043] According to one aspect of the present application, it is characterized in that the random access-free switching process relies on the running of a second timer; and the second timer is associated with the timing advance of the first serving cell.

[0044] As an embodiment, the above method has the following benefits: it is helpful to reduce the impact of reduced accuracy of candidate cell TA due to changes in serving cell TA in UE-based timing advance measurement.

[0045] As an embodiment, the benefits of the above method include: when the UE does not perform RACH-less LTM, it is beneficial for the network to release the radio link resources reserved by the candidate cell.

[0046] As an embodiment, the benefits of the above method include: it is helpful to improve the robustness of the LTM process.

[0047] According to one aspect of the present application, it is characterized in that the switching process free of random access relies on the first TCI state and the first CG resource being associated; the first TCI state is activated.

[0048] As an embodiment, the benefits of the above method include: facilitating the fallback from RACH-less LTM to RACH-based LTM.

[0049] As an embodiment, the benefits of the above method include: facilitating the candidate cell to receive the UE uplink transmission.

[0050] As an embodiment, the benefits of the above method include: it is facilitating the verification of the validity of different early uplink synchronizations.

[0051] As an embodiment, the benefits of the above method include: reducing changes to the protocol and being easy to implement.

[0052] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0053] Sending a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; sending a first MAC CE; wherein the first MAC CE indicates the first candidate cell;

[0054] Among them, the recipient of the first RRC message, as a response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0055] According to one aspect of the present application, it is characterized in that the first moment is the moment when the downlink reception timing difference between the first candidate cell and the first serving cell is measured; and the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

[0056] According to one aspect of the present application, it is characterized in that the recipient of the first RRC message starts or restarts a first timer at the first moment;

[0057] The fact that the time interval between the first moment and the second moment is not greater than the first time threshold means that the first timer is running.

[0058] According to one aspect of the present application, it is characterized in that it includes:

[0059] Sending a first signaling;

[0060] The receiver of the first RRC message stops the first timer as a response to receiving the first signaling; and the first signaling indicates stopping the measurement of the UE-based timing advance for the first candidate cell.

[0061] According to one aspect of the present application, it is characterized by comprising:

[0062] The recipient of the first RRC message stops the first timer in response to the difference between the first RSRP and the second RSRP being greater than a first RSRP threshold; wherein the first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0063] According to one aspect of the present application, it is characterized in that the random access-free switching process relies on the running of a second timer; and the second timer is associated with the timing advance of the first serving cell.

[0064] According to one aspect of the present application, it is characterized in that the switching process free of random access relies on the first TCI state and the first CG resource being associated; the first TCI state is activated.

[0065] The present application discloses a first node used for wireless communication, characterized in that it includes:

[0066] A first receiver receives a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; receives a first MAC CE; wherein the first MAC CE indicates the first candidate cell;

[0067] The first processor, in response to receiving the first MAC CE, performs a handover process; wherein the handover process is free of random access;

[0068] Among them, the switching process free of random access relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0069] The present application discloses a second node used for wireless communication, characterized in that it includes:

[0070] A second transmitter sends a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; sends a first MAC CE; wherein the first MAC CE indicates the first candidate cell;

[0071] Among them, the recipient of the first RRC message, as a response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0072] As an embodiment, compared with the traditional solution, this application has the following advantages:

[0073] -. It is beneficial to improve the robustness of the handover process without random access and reduce the probability of handover failure.

[0074] -. It is beneficial to improve the accuracy of the candidate cell TA obtained based on the timing advance measurement of the UE.

[0075] -. It is beneficial to the maintenance of candidate cell TA.

[0076] -. It is beneficial for the network to terminate the UE-based timing advance measurement.

[0077] -. It is conducive to the fallback from RACH-less LTM to RACH-based LTM.

[0078] -. It is beneficial for the network to release reserved wireless resources in advance.

[0079] -. It is conducive to monitoring the quality of wireless links in candidate cells.

[0080] -. It is helpful to reduce the impact of reduced accuracy of candidate cell TA due to changes in serving cell TA in UE-based timing advance measurement.

[0081] -. It is beneficial for the candidate cell to receive the UE's uplink transmission.

[0082] -.It is helpful to improve the robustness of the LTM process. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] 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:

[0084] Figure 1 A flowchart of validity verification of timing advance measurement based on UE according to an embodiment of the present application is shown;

[0085] Figure 2 A schematic diagram of a network architecture according to an embodiment of the present application is shown;

[0086] 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;

[0087] 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;

[0088] Figure 5 A wireless signal transmission flow chart according to an embodiment of the present application is shown;

[0089] Figure 6 A schematic diagram showing a UE-based timing advance measurement depending on the downlink reception timing difference between the first candidate cell and the first serving cell according to an embodiment of the present application is shown;

[0090] Figure 7 A schematic diagram showing starting or restarting a first timer at a first moment according to an embodiment of the present application is shown;

[0091] Figure 8 A schematic diagram showing a relationship between a first RSRP, a second RSRP and a first timer according to an embodiment of the present application;

[0092] Fig. 9 A schematic diagram showing a handover process free of random access relying on a second timer according to an embodiment of the present application is shown;

[0093] Fig.10 A schematic diagram showing the association between the first TCI state and the first CG resource in the switching process without random access according to an embodiment of the present application is shown;

[0094] Fig.11 A structural block diagram of a processing device used in a first node according to an embodiment of the present application is shown;

[0095] Fig.12 A structural block diagram of a processing device used in a second node according to an embodiment of the present application is shown;

[0096] Fig.13 A schematic diagram of an artificial intelligence processing system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0097] 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.

[0098] Example 1

[0099] Embodiment 1 illustrates a flowchart of the validity verification of the timing advance measurement based on the UE 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.

[0100] In embodiment 1, the first node in the present application receives a first RRC message in step 101; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; in step 102, a first MAC CE is received; wherein the first MAC CE indicates the first candidate cell; in step 103, as a response to receiving the first MAC CE, a handover process is performed; wherein the handover process is free of random access;

[0101] Among them, the switching process free of random access relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0102] As an embodiment, the first RRC message is an RRC reconfiguration message.

[0103] As an embodiment, the first RRC message is an RRCReconfiguration message.

[0104] As an embodiment, the first RRC message is a ReconfigurationWithSync domain.

[0105] As an embodiment, the first RRC message includes an LTM-Config field, and the LTM-Config field includes the target configuration of the first candidate cell.

[0106] As an embodiment, the first RRC message includes an LTM-Candidate field, and the LTM-Candidate field is the target configuration of the first candidate cell.

[0107] As an embodiment, the configuration information of the first candidate cell is an LTM-Candidate field.

[0108] As an embodiment, the configuration information of the first candidate cell includes a ltm-UE-MeasuredTA-ID field, and the ltm-UE-MeasuredTA-ID field indicates the UE-based timing advance measurement for the first candidate cell.

[0109] As an embodiment, the one LTM-Config field in the first RRC message includes an ltm-ServingCellUE-MeasuredTA-ID field; as a response to receiving the first RRC message, the one ltm-ServingCellUE-MeasuredTA-ID field in the one LTM-Config field is used to update the first UE variable.

[0110] As a sub-embodiment of the above embodiment, when the first UE variable already includes the ltm-ServingCellUE-MeasuredTA-ID field, updating the first UE variable refers to replacing the ltm-ServingCellUE-MeasuredTA-ID field in the first variable.

[0111] As a sub-embodiment of the above embodiment, when the first UE variable does not include the ltm-ServingCellUE-MeasuredTA-ID field, updating the first UE variable refers to storing the ltm-ServingCellUE-MeasuredTA-ID field in the first variable.

[0112] As an embodiment, the first UE variable is VarLTM-ServingCellUE-MeasuredTA-ID.

[0113] As an embodiment, the ltm-UE-MeasuredTA-ID field indicates that the UE-based timing advance measurement for the first candidate cell means that the value of the ltm-UE-MeasuredTA-ID field is equal to the value of the VarLTM-ServingCellUE-MeasuredTA-ID field in the first UE variable.

[0114] As an embodiment, the first serving cell is the SpCell of the first node.

[0115] As an embodiment, the first candidate cell is configured to the first serving cell means that the first candidate cell is a candidate of the first serving cell.

[0116] As an embodiment, the first candidate cell is configured to the first serving cell means that the first candidate cell is configured as a candidate cell of the first serving cell.

[0117] As an embodiment, the first candidate cell being a candidate of the first serving cell means that: the first candidate cell is an LTM candidate cell of the first serving cell.

[0118] As an embodiment, the first candidate cell being a candidate of the first serving cell means that: the first candidate cell is a conditional LTM candidate cell of the first serving cell.

[0119] As an embodiment, the first candidate cell being a candidate of the first serving cell means that: the first candidate cell is a C-LTM candidate cell of the first serving cell.

[0120] As an embodiment, the first candidate cell being a candidate of the first serving cell means that: the first candidate cell is a continuous LTM candidate cell of the first serving cell.

[0121] As an embodiment, the first candidate cell being a candidate of the first serving cell means that: the first candidate cell is the CHO of the first serving cell.

[0122] As an embodiment, the first candidate cell being a candidate for the first serving cell means: the first serving cell is a SpCell, the first candidate cell is a candidate SpCell; and the SpCell is a PCell or a PSCell.

[0123] As an embodiment, the UE-based timing advance measurement refers to: measuring the timing advance by the UE.

[0124] As an embodiment, the UE-based timing advance measurement refers to: determining the timing advance based on UE measurement.

[0125] As an embodiment, the UE-based timing advance measurement includes: a process in which the UE derives a timing advance applied to a first uplink transmission to the first candidate cell.

[0126] As an embodiment, the UE-based timing advance measurement includes: the UE performs a first measurement process.

[0127] As an embodiment, the first measurement process is L3 measurement.

[0128] As an embodiment, the first measurement process is L1 measurement.

[0129] As an embodiment, the first measurement process includes L3 measurement.

[0130] As an embodiment, the first measurement process includes L1 measurement.

[0131] As an embodiment, the first measurement process is RSTD measurement.

[0132] As an embodiment, the first measurement process is based on SSB measurement.

[0133] As an embodiment, the first measurement process is based on PRS measurement.

[0134] As an embodiment, the first measurement process refers to: measuring the downlink reception timing difference between the first serving cell and the first candidate cell.

[0135] As an embodiment, the UE-based timing advance measurement includes: the UE performs a first derivation process.

[0136] As an embodiment, the first derivation process refers to: a process of deriving the uplink timing advance of the first candidate cell based on the downlink reception timing difference between the first service cell and the first candidate cell and the effective uplink timing of the first candidate cell, as well as the downlink transmission timing difference between the first service cell and the first candidate cell.

[0137] As an embodiment, the UE-based timing advance measurement includes: performing the first derivation process.

[0138] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell + 2×downlink receiving timing difference.

[0139] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell - 2×downlink receiving timing difference.

[0140] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell + 2×(downlink receiving timing difference - downlink sending timing difference).

[0141] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell - 2×(downlink receiving timing difference - downlink sending timing difference).

[0142] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell + 2×(downlink receiving timing difference + downlink sending timing difference).

[0143] As a sub-embodiment of the above embodiment, the first derivation process is: the uplink timing of the first candidate cell = the uplink timing of the first serving cell - 2×(downlink receiving timing difference + downlink sending timing difference).

[0144] As a sub-embodiment of the above embodiment, the downlink reception timing difference refers to: a downlink reception timing difference of the first candidate cell relative to the first serving cell.

[0145] As a sub-embodiment of the above embodiment, the downlink transmission timing difference refers to: a downlink transmission timing difference between the first candidate cell and the first serving cell.

[0146] As a sub-embodiment of the above embodiment, the downlink reception timing difference refers to: a downlink reception timing difference between the first serving cell and the first candidate cell.

[0147] As a sub-embodiment of the above embodiment, the downlink receiving and sending timing difference refers to: a downlink sending timing difference between the first serving cell and the first candidate cell.

[0148] As an embodiment, the downlink transmission timing difference is based on preconfiguration.

[0149] As an embodiment, the uplink timing of the first service cell refers to the uplink timing advance of the PTAG of the first service cell.

[0150] As an embodiment, the uplink timing of the first service cell refers to the uplink timing advance associated with the PTAG of the first service cell.

[0151] As a sub-embodiment of the above embodiment, the downlink sending timing difference is configured by an RRC message.

[0152] As a sub-embodiment of the above embodiment, the downlink sending timing difference is configured by the first RRC message.

[0153] As a sub-embodiment of the above embodiment, the downlink sending timing difference is configured by the configuration information of the candidate cell in the first RRC message.

[0154] As a sub-embodiment of the above embodiment, the downlink sending timing difference is configured by MAC CE.

[0155] As a sub-embodiment of the above embodiment, the downlink sending timing difference is configured by the first MAC CE.

[0156] As an embodiment, the downlink receiving timing difference is based on the first measurement process.

[0157] As an embodiment, the UE-based timing advance measurement is implemented based on the UE.

[0158] As an embodiment, the UE-based timing advance measurement is based on the 3GPP protocol.

[0159] As an embodiment, the UE-based timing advance measurement is partially based on UE implementation and partially based on 3GPP protocol.

[0160] As an embodiment, the switching process is a random access-free (RACH-less) LTM cell switching process.

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

[0162] As an embodiment, the first MAC CE includes a Target Configuration ID field, and the Target Configuration ID field indicates the first candidate cell.

[0163] As an embodiment, the one Target Configuration ID field indicating the first candidate cell means: a Target Configuration ID field indicating the configuration information of the first candidate cell.

[0164] As an embodiment, the first MAC CE does not indicate a valid TA of the first candidate cell.

[0165] As an embodiment, the first MAC CE includes a Timing Advance Command field, and the value of the Timing Advance Command field is FFF.

[0166] As an embodiment, the first moment is related to the moment at which the UE-based timing advance for the first candidate cell is measured.

[0167] As an embodiment, the first moment is related to the moment at which the UE-based timing advance for the first candidate cell is measured before receiving the first signaling.

[0168] As an embodiment, whenever the downlink reception timing difference between the first candidate cell and the first serving cell is measured, a first indication is sent to an upper layer.

[0169] As an embodiment, whenever the UE-based timing advance for the first candidate cell is measured, a first indication is sent to an upper layer.

[0170] As an embodiment, how the MAC sublayer knows that the downlink reception timing difference between the first candidate cell and the first serving cell is measured depends on the UE implementation.

[0171] As an embodiment, how the MAC sublayer knows that the UE-based timing advance for the first candidate cell is measured depends on the UE implementation.

[0172] As an embodiment, the first moment is the moment when the UE-based timing advance for the first candidate cell is last measured.

[0173] As an embodiment, the first moment is the moment when the UE-based timing advance for the first candidate cell is last measured before receiving the first signaling.

[0174] As an embodiment, the first moment is the moment when the first indication is received at the MAC sublayer for the last time.

[0175] As an embodiment, the first moment is the moment of receiving the first indication at the MAC sublayer for the last time before receiving the first signaling.

[0176] As an embodiment, the first CG resource is any CG resource configured for the first candidate cell for LTM.

[0177] As an embodiment, the random access-free switching process relies on the difference between the first RSRP and the second RSRP being no greater than a first RSRP threshold; the first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0178] As an embodiment, the time of the first moment is recorded.

[0179] As an embodiment, the time of the first moment is recorded by a timestamp.

[0180] As an embodiment, how to determine the time interval between the first moment and the second moment depends on UE implementation.

[0181] As an embodiment, how to record the first moment depends on UE implementation.

[0182] As an embodiment, the first CG resource is a configured grant Type 1.

[0183] As an embodiment, the first CG resource is a configured grantType 1 for LTM cell switching.

[0184] As an embodiment, the first CG resource is for the first uplink transmission on the first candidate cell to avoid random access during the switching process.

[0185] As an embodiment, the first CG resource is the CG resource configuration used for the first uplink transmission on the first candidate cell during the switching process without random access.

[0186] As an embodiment, the first CG resource is configured by the first RRC message.

[0187] As an embodiment, the first CG resource is configured by the configuration information of the first candidate cell in the first RRC message.

[0188] As an embodiment, the configuration information includes a configuredGrantConfig subdomain, and the configuredGrantConfig subdomain configures the first CG resource.

[0189] As an embodiment, the configuration information includes a CG-LTM-Configuration-r18 subdomain, and the CG-LTM-Configuration-r18 subdomain configures the first CG resource.

[0190] As an embodiment, the first CG resource is used to send a first message.

[0191] As a sub-embodiment of the above embodiment, the first message is an RRC ReconfigurationComplete message.

[0192] As a sub-embodiment of the above embodiment, the first message is the first uplink transmission of the handover process without random access on the first candidate cell.

[0193] As a sub-embodiment of the above embodiment, the first message is the initial transmission at LTM cell switch.

[0194] As a sub-embodiment of the above embodiment, as a response to the successful sending of the first message, the first CG resource is released.

[0195] As an embodiment, the second moment is related to the first CG resource.

[0196] As an embodiment, the second moment is the starting moment of the first CG resource indicated by the configuration information of the first candidate cell.

[0197] As an embodiment, the second moment is related to the first CG timing of the first CG resource.

[0198] As an embodiment, the second moment is the starting moment of the first CG opportunity.

[0199] As an embodiment, the first MAC CE indicates a UL TCI State ID, and the first CG opportunity is a CG opportunity associated with the SSB corresponding to the one UL TCI State ID in the first CG resource.

[0200] Example 2

[0201] Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the attached Figure 2 Attached Figure 2The network architecture 200 of a 5G NR (New Radio) / LTE (Long-Term Evolution) / LTE-A (Long-Term Evolution Advanced) system is illustrated. The 5G NR / LTE / LTE-A network architecture 200 may be referred to as a 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable term. The 5GS / EPS 200 includes at least one of a UE (User Equipment) 201, a RAN (Radio Access Network) 202, a 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, a HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and an Internet service 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 switching services, but it will be readily understood by those skilled in the art that the various concepts presented throughout this application can be extended to networks or other cellular networks that provide circuit switching services. RAN includes node 203 and other nodes 204. Node 203 provides user and control plane protocol termination towards UE 201. Node 203 can be connected to other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. Node 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 terminology. Node 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.Node 203 is connected to 5GC / EPC210 via an 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 a control node that handles signaling between UE201 and 5GC / EPC210. ​​In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocal) 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.

[0202] As an embodiment, the UE201 corresponds to the first node in the present application.

[0203] As an embodiment, the UE 201 is a user equipment (User Equipment, UE).

[0204] As an embodiment, the UE201 is a base station device (BaseStation, BS).

[0205] As an embodiment, the UE 201 is a relay device.

[0206] As an embodiment, the UE201 is a gateway device.

[0207] As an embodiment, the node 203 corresponds to the second node in the present application.

[0208] As an embodiment, the node 203 is a base station device.

[0209] As an embodiment, the node 203 is a user equipment.

[0210] As an embodiment, the node 203 is a relay device.

[0211] As an embodiment, the node 203 is a gateway device.

[0212] Typically, the UE 201 is a user equipment, and the node 203 is a base station device.

[0213] Typically, the UE 201 is a user equipment, and the node 203 is a user equipment.

[0214] Typically, the UE 201 is a base station device, and the node 203 is a base station device.

[0215] As an embodiment, the user equipment supports transmission of a non-terrestrial network (NTN).

[0216] As an embodiment, the user equipment supports transmission of a terrestrial network (Terrestrial Network).

[0217] As an embodiment, the user equipment supports dual connection (DC) transmission.

[0218] As an embodiment, the user equipment includes an aircraft.

[0219] As an embodiment, the user equipment includes a vehicle-mounted terminal.

[0220] As an embodiment, the user equipment includes a vessel.

[0221] As an embodiment, the user equipment includes an Internet of Things terminal.

[0222] As an embodiment, the user equipment includes a terminal of the industrial Internet of Things.

[0223] As an embodiment, the user equipment includes a device supporting low-latency and high-reliability transmission.

[0224] As an embodiment, the user equipment includes a test device.

[0225] As an embodiment, the user equipment includes a signaling tester.

[0226] As an embodiment, the user equipment includes IAB (Integrated Access and Backhaul)-MT (Mobile Termination).

[0227] As an embodiment, the base station device supports transmission in a non-terrestrial network.

[0228] As an embodiment, the base station device supports transmission of a terrestrial network.

[0229] As an embodiment, the base station equipment includes a base transceiver station (Base Transceiver Station, BTS).

[0230] As an embodiment, the base station device includes a Node B (NodeB, NB).

[0231] As an embodiment, the base station device includes a gNB.

[0232] As an embodiment, the base station device includes an eNB.

[0233] As an embodiment, the base station device includes ng-eNB.

[0234] As an embodiment, the base station device includes en-gNB.

[0235] As an embodiment, the base station device includes a CU (Centralized Unit).

[0236] As an embodiment, the base station device includes a DU (Distributed Unit).

[0237] As an embodiment, the base station device includes a TRP (Transmitter Receiver Point).

[0238] As an embodiment, the base station device includes a macro cellular (Marco Cellular) base station.

[0239] As an embodiment, the base station device includes a micro cell base station.

[0240] As an embodiment, the base station device includes a pico cell (Pico Cell) base station.

[0241] As an embodiment, the base station device includes a home base station (Femtocell).

[0242] As an embodiment, the base station device includes a flying platform device.

[0243] As an embodiment, the base station device includes a satellite device.

[0244] As an embodiment, the base station device includes a testing device.

[0245] As an embodiment, the base station equipment includes a signaling tester.

[0246] As an embodiment, the base station device includes a gateway device.

[0247] As an embodiment, the base station device includes an IAB-node.

[0248] As an embodiment, the base station device includes an IAB-donor.

[0249] As an embodiment, the base station device includes an IAB-donor-CU.

[0250] As an embodiment, the base station device includes an IAB-donor-DU.

[0251] As an embodiment, the base station device includes an IAB-DU.

[0252] As an embodiment, the base station device includes IAB-MT.

[0253] As an embodiment, the relay device includes a relay.

[0254] As an embodiment, the relay device includes an L3 relay.

[0255] As an embodiment, the relay device includes an L2 relay.

[0256] As an embodiment, the relay device includes a router.

[0257] As an embodiment, the relay device includes a switch.

[0258] As an embodiment, the relay device includes a gateway device.

[0259] As an embodiment, the relay device includes user equipment.

[0260] As an embodiment, the relay device includes a base station device.

[0261] Example 3

[0262] 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 3 The radio protocol architecture for the control plane 300 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 PHY 301 in this article. Layer 2 (L2 layer) 305 is above PHY 301 and includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304. 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 inter-zone mobility support. 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 (Hybrid Automatic Repeat Request). 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. 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 using RRC signaling to configure the lower layers. The radio protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer). In the user plane 350, the radio protocol architecture 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 a SDAP (Service Data Adaptation Protocol) sublayer 356. The SDAP sublayer 356 is responsible for mapping between QoS flows and data radio bearers (DRBs) to support service diversity.

[0263] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0264] As an example, Figure 3 The wireless protocol architecture in is applicable to the second node in this application.

[0265] As an embodiment, the first RRC message in the present application is generated in the RRC306.

[0266] As an embodiment, the first MAC CE in the present application is generated by the MAC302 or MAC352.

[0267] As an embodiment, the first signaling in the present application is generated in the RRC306.

[0268] As an embodiment, the first signaling in the present application is generated by the MAC302 or MAC352.

[0269] As an embodiment, the first signaling in the present application is generated in the PHY301 or PHY351.

[0270] Example 4

[0271] Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to 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.

[0272] 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, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter / receiver 454 and an antenna 452.

[0273] The second communication device 410 includes a controller / processor 475 , a memory 476 , a receive processor 470 , a transmit processor 416 , a multi-antenna receive processor 472 , a multi-antenna transmit processor 471 , a transmitter / receiver 418 and an antenna 420 .

[0274] In transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, 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. In 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 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] As an embodiment, the first communication device 450 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 at least: receives a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource for the first candidate cell, and the first candidate cell is configured for a first serving cell; receives a first MAC CE; wherein the first MAC CE indicates the first candidate cell; as a response to receiving the first MAC CE, performs a switching process; wherein the switching process is free of random access; wherein the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than a first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0279] As an embodiment, the first communication device 450 includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: receiving a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured for a first service cell; receiving a first MAC CE; wherein the first MAC CE indicates the first candidate cell; as a response to receiving the first MAC CE, performing a switching process; wherein the switching process is free of random access; wherein the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than a first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0280] As an embodiment, the second communication device 410 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. The second communication device 410 at least: sends a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured for a first serving cell; sends a first MAC CE; wherein the first MAC CE indicates the first candidate cell; wherein the receiver of the first RRC message, as a response to receiving the first MAC CE, performs a handover process; the handover process is free of random access; the handover process is free of random access and relies on the time interval between at least the first moment and the second moment being not greater than a first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0281] As an embodiment, the second communication device 410 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generates actions when executed by at least one processor, the actions including: sending a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource for the first candidate cell, and the first candidate cell is configured for a first service cell; sending a first MAC CE; wherein the first MAC CE indicates the first candidate cell; wherein the receiver of the first RRC message, as a response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on the time interval between at least the first moment and the second moment being not greater than a first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0282] As an embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first RRC message.

[0283] As an embodiment, at least one of the antenna 420, the transmitter 418, the transmit processor 416, and the controller / processor 475 is used to send the first RRC message.

[0284] As an embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first MAC CE.

[0285] As an embodiment, at least one of the antenna 420, the transmitter 418, the transmit processor 416, and the controller / processor 475 is used to send the first MAC CE.

[0286] As an embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first signaling.

[0287] As an embodiment, at least one of the antenna 420, the transmitter 418, the transmit processor 416, and the controller / processor 475 is used to send the first signaling.

[0288] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0289] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0290] As an embodiment, the first communication device 450 is a user equipment.

[0291] As an embodiment, the first communication device 450 is a base station device.

[0292] As an embodiment, the first communication device 450 is a relay device.

[0293] As an embodiment, the second communication device 410 is a user equipment.

[0294] As an embodiment, the second communication device 410 is a base station device.

[0295] As an embodiment, the second communication device 410 is a relay device.

[0296] Example 5

[0297] Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Figure 5 It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in this application.

[0298] for First node U01:

[0299] In step S5101, a first RRC message is received;

[0300] In step S5102, receiving a first signaling;

[0301] In step S5103, a first MAC CE is received;

[0302] In step S5104, as a response to receiving the first MAC CE, a handover process is performed;

[0303] for Second node N02:

[0304] In step S5201, a first RRC message is sent;

[0305] In step S5202, a first signaling is sent;

[0306] In step S5203, a first MAC CE is sent;

[0307] In embodiment 5, the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; the first MAC CE indicates the first candidate cell; and the handover process is free of random access;

[0308] The random access-free switching process relies on at least the time interval between the first moment and the second moment being no greater than a first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG timing of the first CG resource; as a response to the first signaling being received, the first timer is stopped; the first signaling indicates to stop the measurement of the UE-based timing advance for the first candidate cell.

[0309] As an embodiment, the first node U01 and the second node N02 are connected wirelessly.

[0310] As an embodiment, the first node U01 and the second node N02 are connected via a wire.

[0311] As an embodiment, the first node U01 and the second node N02 are connected via a Uu port.

[0312] As an embodiment, the first node U01 and the second node N02 are connected via an IAB port.

[0313] As an embodiment, the first node U01 and the second node N02 are connected via a PC5 interface.

[0314] As an embodiment, the dashed box F5.1 is optional.

[0315] As an embodiment, the dashed box F5.1 exists.

[0316] As an embodiment, the dotted box F5.1 does not exist.

[0317] As an embodiment, the first signaling indicates cancellation of UE-based timing advance measurement for the first candidate cell.

[0318] As an embodiment, the first signaling is an RRC sublayer signaling.

[0319] As an embodiment, the first signaling is a MAC sublayer signaling.

[0320] As an embodiment, the first signaling at least indicates the first candidate cell.

[0321] As an embodiment, the first signaling includes at least one LTM-CandidateId field, and the at least one LTM-CandidateId field indicates at least the first candidate cell.

[0322] As an embodiment, the first signaling includes at least one ltm-UE-MeasuredTA-ID field, and the at least one ltm-UE-MeasuredTA-ID field indicates at least the first candidate cell.

[0323] As an embodiment, the first signaling at least indicates that the first candidate cell means that: the first signaling includes an LTM-CandidateId field, and the LTM-CandidateId field is the same as the LTM-CandidateId of the first candidate cell.

[0324] As an embodiment, the first signaling at least indicates that the first candidate cell means that: the first signaling includes an ltm-UE-MeasuredTA-ID field, and the ltm-UE-MeasuredTA-ID field is the same as the ltm-UE-MeasuredTA-ID of the first candidate cell.

[0325] As an embodiment, in response to receiving the first signaling, UE-based timing advance measurement for the first candidate cell is terminated.

[0326] As an embodiment, the first signaling indicates one or more candidate cells; and in response to receiving the first signaling, UE-based timing advance measurement for the one or more candidate cells is terminated.

[0327] As an embodiment, in response to receiving the first signaling, UE-based timing advance measurement for any candidate cell is terminated.

[0328] As an embodiment, in response to receiving the first signaling, the configuration of the UE-based timing measurement of the first candidate cell is released.

[0329] As an embodiment, the first signaling indicates one or more candidate cells; and in response to receiving the first signaling, the configuration of the UE-based timing measurement of the one or more candidate cells is released.

[0330] As an embodiment, in response to receiving the first signaling, the configuration of UE-based timing measurement of any candidate cell is released.

[0331] As an embodiment, the first timer is a TimingAlignmentTimer.

[0332] As an embodiment, the validity of the downlink reception timing difference between the first candidate cell and the first serving cell depends on the second timer.

[0333] As an embodiment, the first timer is used to maintain the validity of the downlink reception timing difference between the first candidate cell and the first serving cell.

[0334] As an embodiment, stopping the first timer refers to: pausing the first timer.

[0335] As an embodiment, stopping the first timer means: stopping the first timer and considering the first timer to be expired.

[0336] As an embodiment, in response to successfully measuring the downlink reception timing difference between the first candidate cell and the first serving cell, the first timer is started or restarted.

[0337] As an embodiment, expiration of the first timer triggers measurement of the downlink reception timing difference between the first candidate cell and the first serving cell.

[0338] As an embodiment, before receiving the first MAC CE, expiration of the first timer triggers measurement of the downlink reception timing difference between the first candidate cell and the first serving cell.

[0339] As an embodiment, when the handover process without random access is in progress, the expiration of the first timer triggers the stopping of the handover process without random access.

[0340] As an embodiment, after receiving the first MAC CE and while the switching process without random access is in progress, the expiration of the first timer triggers the stopping of the switching process without random access, releases the first CG resources, and initiates a random access process.

[0341] As an embodiment, after receiving the first MAC CE and while the switching process without random access is in progress, the expiration of the first timer triggers the stopping of the switching process without random access and releases the first CG resources.

[0342] Example 6

[0343] Embodiment 6 illustrates a schematic diagram of a timing advance measurement based on a UE according to an embodiment of the present application that depends on the downlink reception timing difference between the first candidate cell and the first serving cell, as shown in the attached figure. Figure 6 shown.

[0344] In Embodiment 6, the first moment is the moment at which the downlink reception timing difference between the first candidate cell and the first serving cell is measured; and the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

[0345] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell and the timing advance of the first serving cell.

[0346] As an embodiment, the first moment is the moment when the downlink receiving timing difference between the first candidate cell and the first serving cell is last measured before receiving the first signaling.

[0347] As an embodiment, as a response to successfully measuring the downlink reception timing difference between the first candidate cell and the first serving cell, an indication is sent to the MAC sublayer; the first moment is the moment when the MAC sublayer receives the indication.

[0348] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first service cell, which means that the timing advance amount of the first candidate cell obtained by the UE-based timing advance measurement is linearly correlated to twice the downlink reception timing difference between the first candidate cell and the first service cell.

[0349] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell, which means: the UE-based timing advance measurement includes the first measurement process and the first derivation process; the first measurement process measures the downlink reception timing difference; the first derivation process obtains the timing advance of the first candidate cell according to the downlink reception timing difference.

[0350] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first service cell, which means: the timing advance amount of the first candidate cell obtained by the UE-based timing advance measurement is linearly = the uplink timing of the first service cell + 2×the downlink reception timing difference between the first candidate cell and the first service cell.

[0351] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first service cell, which means: the timing advance amount of the first candidate cell obtained by the UE-based timing advance measurement is linearly = the uplink timing of the first service cell - 2×the downlink reception timing difference between the first candidate cell and the first service cell.

[0352] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first service cell, which means: the timing advance amount of the first candidate cell obtained by the UE-based timing advance measurement is linearly = the uplink timing of the first service cell + 2×the downlink reception timing difference between the first candidate cell and the first service cell-2×the downlink transmission timing difference between the first candidate cell and the first service cell.

[0353] As an embodiment, the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first service cell, which means: the timing advance amount of the first candidate cell obtained by the UE-based timing advance measurement is linearly = the uplink timing of the first service cell - 2×the downlink reception timing difference between the first candidate cell and the first service cell - 2×the downlink transmission timing difference between the first candidate cell and the first service cell.

[0354] As an embodiment, when the first candidate cell is synchronized with the first serving cell, the downlink transmission timing difference between the first candidate cell and the first serving cell does not exist.

[0355] As an embodiment, when the first candidate cell is synchronized with the first serving cell, the downlink transmission timing difference between the first candidate cell and the first serving cell is 0.

[0356] As an embodiment, the downlink reception timing difference between the first candidate cell and the first service cell refers to: the delay amount of the downlink reception timing of the first candidate cell relative to the downlink reception timing of the first service cell, or the advance amount of the downlink reception timing of the first service cell relative to the downlink reception timing of the first candidate cell.

[0357] As an embodiment, the downlink reception timing difference between the first candidate cell and the first service cell refers to: the downlink reception timing of the first candidate cell is later than the downlink reception timing of the first service cell, or the downlink reception timing of the first service cell is earlier than the downlink reception timing of the first candidate cell.

[0358] As an embodiment, when the downlink reception timing difference between the first candidate cell and the first service cell is positive, it means that the downlink reception timing of the first candidate cell is later than the downlink reception timing of the first service cell, or it means that the downlink reception timing of the first service cell is earlier than the downlink reception timing of the first candidate cell.

[0359] As an embodiment, when the downlink reception timing difference between the first candidate cell and the first service cell is negative, it means that the downlink reception timing of the first candidate cell is earlier than the downlink reception timing of the first service cell, or it means that the downlink reception timing of the first service cell is later than the downlink reception timing of the first candidate cell.

[0360] As an embodiment, the downlink transmission timing difference between the first candidate cell and the first service cell refers to: the delay amount of the downlink transmission timing of the first candidate cell relative to the downlink transmission timing of the first service cell, or the advance amount of the downlink transmission timing of the first service cell relative to the downlink transmission timing of the first candidate cell.

[0361] As an embodiment, the downlink transmission timing difference between the first candidate cell and the first service cell refers to: the downlink transmission timing of the first candidate cell is later than the downlink transmission timing of the first service cell, or the downlink transmission timing of the first service cell is earlier than the downlink transmission timing of the first candidate cell.

[0362] As an embodiment, when the downlink transmission timing difference between the first candidate cell and the first service cell is positive, it means that the downlink transmission timing of the first candidate cell is later than the downlink transmission timing of the first service cell, or it means that the downlink transmission timing of the first service cell is earlier than the downlink transmission timing of the first candidate cell.

[0363] As an embodiment, when the downlink transmission timing difference between the first candidate cell and the first service cell is negative, it means that the downlink transmission timing of the first candidate cell is earlier than the downlink transmission timing of the first service cell, or it means that the downlink transmission timing of the first service cell is later than the downlink transmission timing of the first candidate cell.

[0364] As an embodiment, the downlink transmission timing difference between the first candidate cell and the first serving cell is preconfigured.

[0365] As an embodiment, the downlink transmission timing difference between the first candidate cell and the first serving cell is configured by a first RRC message.

[0366] As an embodiment, the downlink transmission timing difference between the first candidate cell and the first serving cell is configured by a MAC CE.

[0367] Example 7

[0368] Embodiment 7 illustrates a schematic diagram of starting or restarting a first timer at a first moment according to an embodiment of the present application, as shown in the attached Figure 7 shown.

[0369] In embodiment 7, the first processor starts or restarts the first timer at the first moment;

[0370] The fact that the time interval between the first moment and the second moment is not greater than the first time threshold means that the first timer is running.

[0371] As an embodiment, in response to the first timer timing out, the downlink reception timing difference between the first candidate cell and the first serving cell is considered invalid.

[0372] As an embodiment, in response to the first timer timing out, it is considered that the downlink reception timing difference between the first candidate cell and the first serving cell is unavailable.

[0373] As an embodiment, the first timer is started or restarted each time the UE-based timing advance for the first candidate cell is successfully measured.

[0374] As an embodiment, whenever the UE-based timing advance for the first candidate cell is successfully measured, an indication is sent to an upper layer; in response to the indication being received, the first timer is started or restarted.

[0375] As an embodiment, when the MAC sublayer receives an instruction to start the first timer, it starts or restarts the first timer.

[0376] As an embodiment, how the MAC sublayer knows that the UE-based timing advance for the first candidate cell is successfully measured depends on the UE implementation.

[0377] As an embodiment, whenever the downlink reception timing difference between the first candidate cell and the first serving cell is successfully measured, the first timer is started or restarted.

[0378] As an embodiment, whenever the downlink reception timing difference between the first candidate cell and the first serving cell is successfully measured, a first indication is sent to an upper layer; as a response to the indication being received at the MAC sublayer, the first timer is started or restarted.

[0379] As an embodiment, in response to expiration of the first timer, a lower layer is instructed to start or restart UE-based timing advance measurement for the first candidate cell.

[0380] As an embodiment, in response to expiration of the first timer, UE-based timing advance measurement for the first candidate cell is started or restarted.

[0381] As an embodiment, in response to the expiration of the first timer, whether to start or restart the UE-based timing advance measurement for the first candidate cell depends on the UE implementation.

[0382] As an embodiment, in response to expiration of the first timer, the UE determines whether to start or restart UE-based timing advance measurement for the first candidate cell.

[0383] As an embodiment, in response to the expiration of the first timer, the measurement of the downlink reception timing difference between the first candidate cell and the first serving cell is started or restarted.

[0384] As an embodiment, in response to the expiration of the first timer, whether to start or restart measuring the downlink reception timing difference between the first candidate cell and the first serving cell.

[0385] As an embodiment, in response to expiration of the first timer, the UE determines whether to start or restart measuring the downlink reception timing difference between the first candidate cell and the first serving cell.

[0386] As an embodiment, the first timer is maintained during the switching process.

[0387] As an embodiment, maintaining the first timer means: resetting the MAC entity during the switching process; resetting the MAC entity does not include stopping the first timer.

[0388] As an embodiment, the first timer is maintained after receiving the first RRC message and before starting the switching process.

[0389] Example 8

[0390] Embodiment 8 illustrates a schematic diagram of the relationship between the first RSRP, the second RSRP and the first timer according to an embodiment of the present application, as shown in the attached figure. Figure 8 shown.

[0391] In Embodiment 8, the first processor, in response to a difference between the first RSRP and the second RSRP being greater than a first RSRP threshold, stops the first timer;

[0392] The first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0393] As an embodiment, the same reference signal of the first candidate cell targeted by the first RSRP and the second RSRP is SSB.

[0394] As an embodiment, the determination of the same reference signal depends on the UE-based timing advance measurement for the first candidate cell.

[0395] As a sub-embodiment of the above embodiment, the same reference signal is a specific reference signal of the first candidate cell used in timing advance measurement of UE of the first candidate cell.

[0396] As a sub-embodiment of the above embodiment, the specific reference signal is a reference signal corresponding to the TCI state of the pre-activated first candidate cell.

[0397] As a sub-embodiment of the above-mentioned embodiment, the determination of the same reference signal depends on the UE-based timing advance measurement for the first candidate cell, which means: the UE-based timing advance measurement includes the first measurement process; the first measurement process includes obtaining the downlink timing of the first candidate cell based on the measurement of the specific reference signal; the specific reference signal is the same reference signal.

[0398] As an embodiment, the first RSRP is an RSRP measurement result of the specific reference signal when the downlink timing of the first candidate cell is successfully measured according to the specific reference signal during the first measurement process.

[0399] As an embodiment, the first RSRP is an RSRP measurement result of the specific reference signal during the downlink timing period of the first candidate cell measured according to the specific reference signal in the first measurement process.

[0400] As an embodiment, the first RSRP is the RSRP measurement result of the specific reference signal when the first derivation process is completed.

[0401] As an embodiment, the first RSRP is the RSRP measurement result of the specific reference signal when receiving the first MAC CE.

[0402] As an embodiment, the first RSRP is the RSRP measurement result of the specific reference signal when the downlink timing of the first candidate cell is successfully measured according to the specific reference signal during the last first measurement process.

[0403] As an embodiment, the first RSRP is the RSRP measurement result of the specific reference signal during the downlink timing period of the first candidate cell measured according to the specific reference signal during the last first measurement process.

[0404] As an embodiment, the first RSRP is the RSRP measurement result of the specific reference signal when the first derivation process is completed for the last time.

[0405] As an embodiment, the last time refers to the latest time.

[0406] As an embodiment, the last time refers to the latest time.

[0407] As an embodiment, the last time refers to the most recent time before receiving the first MAC CE.

[0408] As an embodiment, the last time refers to the most recent time before the switching process is completed.

[0409] As an embodiment, in response to measuring the first RSRP, the measured first RSRP is stored.

[0410] As an embodiment, the second RSRP is a measurement result of the specific reference signal RSRP when receiving the first MAC CE.

[0411] As an embodiment, the second RSRP is any RSRP measurement result of the same reference signal measured after the first RSRP is measured and before the switching process is completed.

[0412] As an embodiment, the second RSRP is any RSRP measurement result of the same reference signal measured after the first RSRP is measured and before the first MACCE is received.

[0413] As an embodiment, the difference between the first RSRP and the second RSRP is greater than the first RSRP threshold, which means that the absolute value of the difference between the first RSRP and the second RSRP is greater than the first RSRP threshold.

[0414] As an embodiment, the difference between the first RSRP and the second RSRP is greater than the first RSRP threshold, which means that an increase or decrease in the second RSRP relative to the first RSRP is greater than the first RSRP threshold.

[0415] As an embodiment, the difference between the first RSRP and the second RSRP being greater than the first RSRP threshold means that a reduction in the second RSRP relative to the first RSRP is greater than the first RSRP threshold.

[0416] As an embodiment, in response to measuring the second RSRP, the measured second RSRP is compared with the stored first RSRP.

[0417] As an embodiment, the first RSRP threshold is preconfigured.

[0418] As an embodiment, the first RSRP threshold is configured by the first RRC message.

[0419] As an embodiment, the first RSRP threshold has a default value.

[0420] As an embodiment, the first RSRP is a measurement result of the RSRP of the specific reference signal at the first moment.

[0421] Example 9

[0422] Embodiment 9 illustrates a schematic diagram of the handover process free of random access relying on the second timer according to an embodiment of the present application, as shown in the attached Fig. 9 shown.

[0423] In Embodiment 9, the random access-free switching process relies on a second timer running; the second timer is associated with a timing advance of the first serving cell.

[0424] As an embodiment, the second timer is a TimingAlignmentTimer.

[0425] As an embodiment, the validity of the timing advance of the first serving cell depends on the second timer.

[0426] As a sub-embodiment of the above embodiment, the timing advance of the first serving cell refers to the timing advance associated with the PTAG of the first node.

[0427] As a sub-embodiment of the above embodiment, the second timer is a TimingAlignmentTimer associated with the PTAG before the first node receives the first signaling.

[0428] As a sub-embodiment of the above embodiment, the second timer is a TimingAlignmentTimer associated with the TAG where the first serving cell is located.

[0429] As an embodiment, the random access-free switching process relies on at least the time interval between the first moment and the second moment being not greater than the first time threshold and the second timer is running.

[0430] As an embodiment, the random access-free switching process relies on the time interval between the first moment and the second moment being not greater than the first time threshold and the second timer being running.

[0431] As an embodiment, the second timer is maintained during the switching process.

[0432] As an embodiment, maintaining the second timer means: resetting the MAC entity during the switching process; resetting the MAC entity does not include stopping the second timer.

[0433] As an embodiment, the random access-free switching process depends on the second timer being running, which means that when the first MAC CE is received, when at least the second timer is not running, the random access-free switching process is not performed.

[0434] As an embodiment, when the first RRC message indicates the UE-based timing advance measurement for the first candidate cell, when the first MAC CE is received, if the second timer is not running, the random access-free switching process is not performed.

[0435] As an embodiment, when the first RRC message indicates a UE-based timing advance measurement for the first candidate cell, when the first MAC CE is received, if the second timer is not running, it is considered that the first node has no valid timing advance for the first candidate cell.

[0436] As a sub-embodiment of the above embodiment, the absence of a valid timing advance of the first candidate cell means that the first node fails to successfully measure the timing advance of the first candidate cell.

[0437] As a sub-embodiment of the above embodiment, the absence of a valid timing advance of the first candidate cell means that a UE-based timing measurement result of the first node for the first candidate cell is invalid.

[0438] As a sub-embodiment of the above embodiment, the validity of the timing advance of the first candidate cell is judged before the switching process starts.

[0439] As a sub-embodiment of the above embodiment, the validity of the timing advance of the first candidate cell is judged before resetting the MAC entity.

[0440] As an embodiment, after resetting the MAC entity, when there is no valid timing advance of at least the first candidate cell, the random access-free switching process is not performed.

[0441] As an embodiment, after resetting the MAC entity, when there is a valid timing advance of the first candidate cell, the valid timing advance of the first candidate cell is applied, and the switching process without random access is considered to be ongoing (consider the RACH-less LTM cell switch to be ongoing).

[0442] As an embodiment, after resetting the MAC entity, when there is no valid timing advance of at least the first candidate cell, the random access-free switching process is not performed.

[0443] As an embodiment, when the first RRC message indicates the UE-based timing advance measurement for the first candidate cell, when the first MAC CE is received, if the second timer is not running, it is considered that there is no valid CG resource in the first CG resources.

[0444] As an embodiment, after resetting the MAC entity, when there is no valid CG resource of at least the first candidate cell, the switching process without random access is not performed, and a random access process is initiated.

[0445] As an embodiment, after resetting the MAC entity, when there is a valid timing advance of the first candidate cell and there is at least one valid CG resource among the first CG resources, the valid timing advance of the first candidate cell is applied, and it is considered that the switching process without random access is in progress.

[0446] As an embodiment, when receiving the first MAC CE, as a response to successfully measuring the timing advance of the first candidate cell, the MAC reset process is performed, the timing advance of the first candidate cell is applied, and the switching process is started without random access.

[0447] As a sub-embodiment of the above embodiment, in response to successfully measuring the timing advance of the first candidate cell, the MAC reset process does not include resetting the second timer.

[0448] As a sub-embodiment of the above embodiment, in response to successfully measuring the timing advance of the first candidate cell, the MAC reset process includes maintaining the second timer.

[0449] As a sub-embodiment of the above embodiment, in response to successfully measuring the timing advance of the first candidate cell, the second timer is maintained while the handover process without random access is in progress.

[0450] As an embodiment, the switching process free of random access depends on the second timer being running, which means that when the first MAC CE is received, as a response to the fact that the second timer is not running, it is considered that the timing advance of the first candidate cell is not successfully measured.

[0451] As an embodiment, the handover process is free of random access and the dependence of the second timer being running means that when the first MAC CE is received, as a response to the fact that the second timer is not running, it is considered that the measured timing advance of the first candidate cell is invalid.

[0452] As an embodiment, the switching process without random access depends on the second timer being running, which means that when the switching process without random access is in progress, as a response to the fact that the second timer is not running, the switching process without random access is terminated and a random access process is initiated.

[0453] As an embodiment, the switching process without random access depends on the second timer being running, which means that when the switching process without random access is in progress, as a response to the second timer not being running, the switching process without random access is terminated.

[0454] As an embodiment, the not running includes stopping.

[0455] As an embodiment, the not running includes a timeout.

[0456] As an embodiment, the second timer is started or restarted in response to receiving a timing advance command.

[0457] As a sub-embodiment of the above embodiment, the one timing advance command indicates the PTAG of the first serving cell, and the one timing advance command is for the timing advance update of the PTAG of the first serving cell.

[0458] As a sub-embodiment of the above embodiment, before receiving the first MAC CE, the one timing advance command is received on the first serving cell.

[0459] As a sub-embodiment of the above embodiment, after receiving the first MAC CE and while the handover process without random access is in progress, the one timing advance command is received on the first candidate cell.

[0460] As an embodiment, when receiving the first MAC CE, as a response to the fact that either the first timer or the second timer is not running, the switching process without random access is not performed, and a random access process is initiated.

[0461] As an embodiment, upon receiving the first MAC CE, in response to both the first timer and the second timer being running, the switching process is started without random access.

[0462] As an embodiment, when the handover process without random access is in progress, in response to the fact that either the first timer or the second timer is not running, the handover process without random access is terminated.

[0463] As an embodiment, when the handover process without random access is in progress, in response to the fact that either the first timer or the second timer is not running, the handover process without random access is terminated and a random access process is initiated.

[0464] As an embodiment, the switching without random access depends on the second timer being running, which means that when the first MAC CE is received, if the second timer is not running, or if the second timer is running and the remainder of the second timer is less than a threshold, it is considered that the UE has not successfully measured the timing advance of the first candidate cell, and the switching process without random access is not started.

[0465] As an embodiment, the switching without random access depends on the second timer being running, which means that when the first MAC CE is received, if the second timer is not running, or if the second timer is running and the remainder of the second timer is less than a threshold, it is considered that the timing advance of the first candidate cell measured by the UE is invalid, and the switching process without random access is not started.

[0466] As an embodiment, the switching without random access depends on the second timer being running, which means that when the first MAC CE is received, the UE can apply the measured timing advance of the first candidate cell and start the switching process without random access only when the second timer is running and the remainder of the second timer is not less than a threshold and the UE successfully measures the timing advance of the first candidate cell.

[0467] As an embodiment, the switching without random access depends on the second timer being running, which means that: when receiving the first MAC CE, only when the second timer is running and the remainder of the second timer is not less than a threshold and the UE successfully measures the timing advance of the first candidate cell, the UE considers that the timing advance of the first candidate cell measured by it is valid, and the UE applies the timing advance of the first candidate cell and starts the switching process without random access.

[0468] Example 10

[0469] Embodiment 10 illustrates a schematic diagram of the handover process according to an embodiment of the present application free of random access relying on the first TCI state and the first CG resource association, as shown in the attached Fig.10 shown.

[0470] In Embodiment 10, the switching process free of random access relies on the first TCI state being associated with the first CG resource; the first TCI state is activated.

[0471] As an embodiment, the first TCI state is configured by the configuration information of the first candidate cell in the first RRC message.

[0472] As an embodiment, the first TCI state is activated by the first MAC CE.

[0473] As an embodiment, the first TCI state is activated by second signaling.

[0474] As an embodiment, the second signaling is a MAC CE.

[0475] As an embodiment, the second signaling is a DCI.

[0476] As an embodiment, the second signaling is a Candidate Cell TCI StatesActivation / Deactivation MAC CE.

[0477] As an embodiment, the first MAC CE indicates the first TCI state; and as a response to receiving the first MAC CE, the first TCI state is activated.

[0478] As an embodiment, the second signaling indicates the first TCI state; and as a response to receiving the second signaling, the first TCI state is activated.

[0479] As an embodiment, the first MAC CE indicating the first TCI state means that: the first MAC CE includes a UL TCI state ID field, and the UL TCI state ID field indicates the first TCI state.

[0480] As an embodiment, the second signaling indicating the first TCI state means that: the second signaling includes at least one D / U domain and one TCI state ID domain, the value of the D / U domain is 0, and the TCI state ID domain indicates the first TCI state.

[0481] As an embodiment, the random access-free switching process relies on the first TCI state being associated with the first CG resource and the first CG resource being valid.

[0482] As an embodiment, the association between the first TCI state and the first CG resource means that: the reference signal resource indicated by the first TCI state is associated with the first CG resource.

[0483] As an embodiment, the association between the first TCI state and the first CG resource means that the index of the reference signal resource indicated by the first TCI state is the same as the index of the reference signal resource corresponding to the first CG resource.

[0484] As an embodiment, if the first TCI state is associated with the first CG resource, the first CG resource is considered valid; otherwise, the first CG resource is considered invalid.

[0485] As an embodiment, if the first TCI state is associated with the first CG resource, the first CG resource is considered valid; otherwise, the first CG resource is considered invalid and a random access process is initiated.

[0486] As an embodiment, the validity of the first CG resource means that the first CG resource is considered to be available for use.

[0487] As an embodiment, the validity of the first CG resource means that the first TCI state is related to the second TCI state.

[0488] As a sub-embodiment of the above embodiment, the related refers to the same.

[0489] As a sub-embodiment of the above embodiment, the correlation refers to that the two beams are the same.

[0490] As a sub-embodiment of the above embodiment, the correlation means that the two beams are the same and in opposite directions.

[0491] As a sub-embodiment of the above embodiment, the second TCI state is related to the first measurement.

[0492] As a sub-embodiment of the above embodiment, the second TCI state indicates the specific reference signal in the first measurement process.

[0493] As a sub-embodiment of the above embodiment, the second TCI state indicates a reference signal of the first RSRP.

[0494] As a sub-embodiment of the above embodiment, the second TCI state is indicated and activated by a Candidate CellTCI States Activation / Deactivation MAC CE.

[0495] As a sub-embodiment of the above embodiment, the first TCI state is associated with the first CG resource.

[0496] As a sub-embodiment of the above embodiment, as a response to receiving the first MAC CE, the first MACCE indicates the first TCI state. If the beam indicated by the first TCI state is different from that indicated by the second TCI state, the first CG resource is considered invalid; if the beam indicated by the first TCI state is the same as that indicated by the second TCI state, the first CG resource is considered valid.

[0497] As a sub-embodiment of the above embodiment, as a response to receiving the first MAC CE, the first MACCE indicates the first TCI state. If the first TCI state is different from or unrelated to the beam indicated by the second TCI state, the first CG resource is considered invalid; if the first TCI state is the same as or related to the beam indicated by the second TCI state, and the first CG resource is considered valid.

[0498] As an embodiment, a random access process is initiated when the first CG resource is considered invalid.

[0499] As an embodiment, the random access procedure is for RACH-based (RACH-baesd) LTM cell switching.

[0500] As an embodiment, the random access procedure is CFRA.

[0501] As an embodiment, the random access procedure is CBRA.

[0502] As an embodiment, the random access procedure is CFRA or CBRA.

[0503] As an embodiment, the one random access procedure is CFRA or CBRA depending on UE implementation.

[0504] As an embodiment, when the random access-free switching process is not started, the first CG resource is considered invalid and the random access process is initiated.

[0505] As an embodiment, when the switching process without random access is in progress, the first CG resource is considered invalid, the switching process without random access is terminated, and the random access process is initiated.

[0506] As an embodiment, if there is no indicated CFRA resource in the first MAC CE, the random access process adopts CBRA.

[0507] As an embodiment, if there is an indicated CFRA resource in the first MAC CE, the random access process uses the indicated CFRA resource to perform CFRA.

[0508] As an embodiment, when there is an indicated CFRA resource in the first MAC CE, if the difference between the first RSRP and the second RSRP is greater than the first RSRP threshold, the random access process adopts CBRA.

[0509] As an embodiment, the first MAC CE includes a C field, indicating whether the first MAC CE includes CFRA resources.

[0510] As an embodiment, if the value of the C field is 0, the random access process adopts CBRA.

[0511] As an embodiment, if the value of the C field is 1, the random access process uses the indicated CFRA resource to perform CFRA.

[0512] As an embodiment, when the value of the C domain is 1, if the difference between the first RSRP and the second RSRP is greater than the first RSRP threshold, the random access process adopts CBRA.

[0513] As an embodiment, the random access-free switching process relies on at least the time interval between the first moment and the second moment being not greater than the first time threshold and the first TCI state is associated with the first CG resource.

[0514] As an embodiment, the random access-free switching process relies on at least the time interval between the first moment and the second moment being not greater than the first time threshold and the first TCI state is associated with the first CG resource and the first timer is running.

[0515] As an embodiment, if the first TCI state is associated with the first CG resource, and the time interval between the first moment and the second moment is not greater than the first time threshold, the first CG resource is considered valid; otherwise, the first CG resource is considered invalid.

[0516] As an embodiment, the first CG resource is any CG resource configured for the first candidate cell and associated with the first TCI state.

[0517] As an embodiment, the first CG resource is any CG resource associated with the first TCI state and configured for the first candidate cell for LTM.

[0518] As an embodiment, the first CG resource is any CG resource associated with the first TCI state and configured for the first candidate cell for random access-free (RACH-less) LTM.

[0519] As an embodiment, as a response to starting the handover process without random access, the CFRA resources of the first candidate cell indicated by the first MACCE are released.

[0520] As an embodiment, as a response to ending the switching process without random access, the first CG resources are released.

[0521] As an embodiment, in response to initiating the random access process, the first CG resources are released.

[0522] Embodiment 11

[0523] Embodiment 11 illustrates a structural block diagram of a processing device used in a first node according to an embodiment of the present application; Fig.11 As shown in the attached Fig.11 In the embodiment, the first processor 1100 in the first node includes a first transmitter 1101 and a first receiver 1102.

[0524] The first receiver 1102 receives a first RRC message, wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; receives a first MAC CE, wherein the first MAC CE indicates the first candidate cell;

[0525] The first processor 1100 performs a handover process in response to receiving the first MAC CE; wherein the handover process is free of random access;

[0526] In Example 11, the random access-free switching process relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0527] As an embodiment, the first moment is the moment when the downlink reception timing difference between the first candidate cell and the first serving cell is measured; the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

[0528] As an embodiment, the first processor 1100 starts or restarts the first timer at the first moment; wherein, the time interval between the first moment and the second moment is not greater than the first time threshold, which means that the first timer is running.

[0529] As an embodiment, the first processor 1100 receives a first signaling; and stops the first timer in response to the first signaling being received; wherein the first signaling indicates stopping the UE-based timing advance measurement for the first candidate cell.

[0530] As an embodiment, the first processor 1100, in response to a difference between the first RSRP and the second RSRP being greater than a first RSRP threshold, stops the first timer; wherein the first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0531] As an embodiment, the random access-free switching process relies on the second timer being running; the second timer is associated with the timing advance of the first serving cell.

[0532] As an embodiment, the switching process free of random access relies on the first TCI state being associated with the first CG resource; the first TCI state is activated.

[0533] As an embodiment, the first receiver 1102 includes the attached Figure 4 At least one of the antenna 452 or the receiver 454 or the multi-antenna receive processor 458 or the receive processor 456 or the controller / processor 459 or the memory 460 or the data source 467.

[0534] As an embodiment, the first receiver 1102 includes the attached Figure 4 At least an antenna 452 and a receiver 454.

[0535] As an embodiment, the first transmitter 1101 includes the attached Figure 4 At least one of the antenna 452 or transmitter 454 or multi-antenna transmit processor 457 or transmit processor 468 or controller / processor 459 or memory 460 or data source 467.

[0536] As an embodiment, the first transmitter 1101 includes the attached Figure 4 At least antenna 452 and transmitter 454.

[0537] Example 12

[0538] Embodiment 12 illustrates a structural block diagram of a processing device used in a second node according to an embodiment of the present application; Fig.12 As shown in the attached Fig.12 In the embodiment, the second processor 1200 in the second node includes a second transmitter 1201 and a second receiver 1202.

[0539] The second transmitter 1201 sends a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; sends a first MAC CE; wherein the first MAC CE indicates the first candidate cell;

[0540] In Example 12, the receiver of the first RRC message, in response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

[0541] As an embodiment, the first moment is the moment when the downlink reception timing difference between the first candidate cell and the first serving cell is measured; the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

[0542] As an embodiment, the recipient of the first RRC message starts or restarts the first timer at the first moment; wherein, the time interval between the first moment and the second moment is not greater than the first time threshold, which means that the first timer is running.

[0543] As an embodiment, the second transmitter 1201 sends a first signaling; wherein, the receiver of the first RRC message, as a response to receiving the first signaling, stops the first timer; and the first signaling indicates stopping the UE-based timing advance measurement for the first candidate cell.

[0544] As an embodiment, the receiver of the first RRC message stops the first timer in response to the difference between the first RSRP and the second RSRP being greater than a first RSRP threshold; wherein the first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

[0545] As an embodiment, the random access-free switching process relies on the second timer being running; the second timer is associated with the timing advance of the first serving cell.

[0546] As an embodiment, the switching process free of random access relies on the first TCI state being associated with the first CG resource; the first TCI state is activated.

[0547] As an embodiment, the second transmitter 1201 includes the attached Figure 4 At least one of the antenna 420 or the transmitter 418 or the multi-antenna transmit processor 471 or the transmit processor 416 or the controller / processor 475 or the memory 476.

[0548] As an embodiment, the second transmitter 1201 includes the attached Figure 4 At least antenna 420 and transmitter 418.

[0549] As an embodiment, the second receiver 1202 includes the attached Figure 4 At least one of the antenna 420 or the receiver 418 or the multi-antenna reception processor 472 or the reception processor 470 or the controller / processor 475 or the memory 476.

[0550] As an embodiment, the second receiver 1202 includes the attached Figure 4 At least an antenna 420 and a receiver 418.

[0551] Example 13

[0552] Embodiment 13 illustrates a schematic diagram of an artificial intelligence processing system according to an embodiment of the present application, as shown in the attached Fig.13 Attached Fig.13 It includes a first module, a second module, a third module, a fourth module and a fifth module.

[0553] In Example 13, the first module sends a first data set to the second module, the first module sends a second data set to the third module, the first module sends a third data set to the fifth module, the fifth module sends a first type of parameter group to the second module, the fifth module sends a second type of parameter group to the third module, the fifth module sends a third type of parameter group to the fourth module, the second module sends a fourth type of parameter group to the fourth module, and the fourth module sends a fifth type of parameter group to the third module.

[0554] As an embodiment, the first module, the second module, the third module, the fourth module and the fifth module all belong to the first node.

[0555] The above method avoids air interface signaling interaction and shortens transmission delay.

[0556] As an embodiment, any one of the first module, the second module, the third module, the fourth module and the fifth module does not belong to the first node.

[0557] The above method reduces the hardware complexity of the first node.

[0558] As an embodiment, at least the first module among the first module, the second module, the third module, the fourth module and the fifth module belongs to the first node; and at least one module among the first module, the second module, the third module, the fourth module and the fifth module does not belong to the first node.

[0559] The above method balances the hardware complexity and transmission delay of the first node.

[0560] As an embodiment, the first module is used for data collection.

[0561] As an embodiment, the first module is responsible for data collection.

[0562] As an embodiment, the first module has a data collection function.

[0563] As an embodiment, the second module is used for model training (Model Training).

[0564] As an embodiment, the second module is responsible for model training.

[0565] As an embodiment, the second module has a model training function.

[0566] As an embodiment, the second module performs AI / ML model training.

[0567] As an embodiment, the second module performs validation.

[0568] As an embodiment, the second module performs testing.

[0569] As an embodiment, the second module generates model performance metrics.

[0570] As an embodiment, the second module is responsible for data preparation.

[0571] As an embodiment, the data preparation includes at least one of data pre-processing, cleaning, formatting, or transformation.

[0572] As an embodiment, the third module is used for inference.

[0573] As an embodiment, the third module has a reasoning function.

[0574] As an embodiment, the third module is responsible for reasoning.

[0575] As an embodiment, the fourth module is used for model storage (Model Storage).

[0576] As an embodiment, the fourth module has a model storage (Model Storage) function.

[0577] As an embodiment, the fourth module is responsible for storing the trained model.

[0578] As an embodiment, the fourth module is responsible for storing the trained model that can be used to perform reasoning processing.

[0579] As an embodiment, the fifth module is used for management.

[0580] As an embodiment, the fifth module is responsible for management.

[0581] As an embodiment, the fifth module has a management function.

[0582] As an embodiment, the first data set is training data (Training Data).

[0583] As an embodiment, the second data set is inference data.

[0584] As an embodiment, the third data set is monitoring data.

[0585] As an embodiment, the first parameter group includes monitoring output.

[0586] As an embodiment, the second type of parameter group includes management instructions.

[0587] As an embodiment, the second type of parameter group is used for fine-tuning operation of the inference function.

[0588] As an embodiment, the second parameter group includes an identifier of the model.

[0589] As an embodiment, the second type of parameter group is used to select a model.

[0590] As an embodiment, the second type of parameter group is used for switching models.

[0591] As an embodiment, the second type of parameter group is used to activate / deactivate the model.

[0592] As an embodiment, the second type of parameter group is used to fall back from AI-ML operation to non-AI-ML operation.

[0593] As an embodiment, the third type of parameter group includes a model transfer request (Model Transfer Request).

[0594] As an embodiment, the third parameter group includes a model delivery request (Model DeliveryRequest).

[0595] As an embodiment, the fourth parameter group includes a trained model (Trained Model).

[0596] As an embodiment, the fourth parameter group includes an updated model (Updated Model).

[0597] As an embodiment, the fourth type of parameter group indicates the identification of the model.

[0598] As an embodiment, the fifth parameter group includes model transfer.

[0599] As an embodiment, the fifth parameter group includes model delivery.

[0600] As an embodiment, the fifth type of parameter group indicates the identification of the model.

[0601] As an embodiment, the first type of output includes a monitoring output.

[0602] As an embodiment, the first type of output exists.

[0603] As an embodiment, the first type of output does not exist.

[0604] As an embodiment, the second type of output includes inference output.

[0605] As an embodiment, the second type of output is used by the fifth module to monitor the performance of the AI / ML model.

[0606] As an embodiment, the second type of output is used by the fifth module to monitor the performance of the AI / ML function.

[0607] As an embodiment, the second type of output exists.

[0608] As an embodiment, the second type of output does not exist.

[0609] As an embodiment, the artificial intelligence processing system generates or assists in generating a judgment on whether the timing advance of the first candidate cell is valid or whether the first CG resource is valid or a judgment on the first candidate cell or the first moment.

[0610] As an embodiment, the fifth module generates or assists in generating a judgment on whether the timing advance of the first candidate cell is valid or whether the first CG resource is valid or a judgment on the first candidate cell or the first moment.

[0611] As an embodiment, the third module generates or assists in generating a judgment of whether the timing advance of the first candidate cell is valid or whether the first CG resource is valid or a judgment of the first candidate cell or the first moment.

[0612] As an embodiment, the second type of output includes a judgment of whether the timing advance of the first candidate cell is valid or whether the first CG resource is valid or a judgment of the first candidate cell or the first moment.

[0613] As an embodiment, at least one of the first data set or the second data set includes the first RRC message.

[0614] As an embodiment, at least one of the first data set or the second data set includes the configuration information of the first candidate cell.

[0615] As an embodiment, at least one of the first data set or the second data set includes the first RSRP and the second RSRP.

[0616] As an embodiment, at least one of the first data set or the second data set includes the measurement result for the first candidate cell.

[0617] As an embodiment, at least one of the first data set or the second data set includes the measurement result for the first serving cell.

[0618] As an embodiment, at least one of the first data set, the second data set, or the third data set includes the first RRC message.

[0619] As an embodiment, at least one of the first data set, the second data set, or the third data set includes the configuration information of the first candidate cell.

[0620] As an embodiment, at least one of the first data set, the second data set, or the third data set includes the first RSRP and the second RSRP.

[0621] As an embodiment, at least one of the first data set, the second data set, or the third data set includes the measurement result for the first candidate cell.

[0622] As an embodiment, at least one of the first data set, the second data set, or the third data set includes the measurement result for the first serving cell.

[0623] As an embodiment, the embodiment 13 is only used to illustrate that the present application can be used in an artificial intelligence processing system. The embodiment does not limit the application of the present application to a non-artificial intelligence processing system, and the embodiment does not limit the application of the present application to other types of artificial intelligence processing systems to obtain and attach Fig.13 The artificial intelligence processing system shown has comparable effects.

[0624] 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 (enhanced MTC, enhanced MTC) terminals, data cards, Internet cards, vehicle-mounted communication equipment, low-cost mobile phones, low-cost tablet computers and other wireless communication devices. The base stations or system devices 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) and other wireless communication devices.

[0625] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A first node used for wireless communication, characterized in that: include: A first receiver receives a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; receives a first MAC CE; wherein the first MAC CE indicates the first candidate cell; The first processor, in response to receiving the first MAC CE, performs a handover process; wherein the handover process is free of random access; Among them, the random access-free switching process relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

2. The first node according to claim 1, characterized in that: The first moment is the moment at which a downlink reception timing difference between the first candidate cell and the first serving cell is measured; and the UE-based timing advance measurement depends on the downlink reception timing difference between the first candidate cell and the first serving cell.

3. The first node according to claim 1 or 2, characterized in that: include: The first processor, at the first moment, starts or restarts a first timer; The fact that the time interval between the first moment and the second moment is not greater than the first time threshold means that the first timer is running.

4. The first node according to claim 3, characterized in that: include: The first processor receives a first signaling; In response to receiving the first signaling, stopping the first timer; The first signaling indicates stopping the measurement of the UE-based timing advance for the first candidate cell.

5. The first node according to any one of claims 2 to 4, characterized in that: include: The first processor, in response to a difference between the first RSRP and the second RSRP being greater than a first RSRP threshold, stops the first timer; The first RSRP and the second RSRP are for the same reference signal of the first candidate cell; and the first RSRP threshold is configurable.

6. The first node according to any one of claims 1 to 5, characterized in that: The random access-free switching process relies on a second timer running; the second timer is associated with the timing advance of the first serving cell.

7. The first node according to any one of claims 1 to 6, characterized in that: The switching process free of random access relies on the first TCI state being associated with the first CG resource; the first TCI state is activated.

8. A second node used for wireless communication, characterized in that: include: A second transmitter sends a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; sends a first MAC CE; wherein the first MAC CE indicates the first candidate cell; Among them, the recipient of the first RRC message, as a response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

9. A method in a first node for wireless communication, characterized in that: include: Receive a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; receive a first MAC CE; wherein the first MAC CE indicates the first candidate cell; as a response to receiving the first MAC CE, perform a handover process; wherein the handover process is free of random access; Among them, the random access-free switching process relies on at least the time interval between the first moment and the second moment being no greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

10. A method in a second node for wireless communication, characterized in that: include: Sending a first RRC message; wherein the first RRC message includes configuration information of a first candidate cell, the configuration information of the first candidate cell indicates at least a UE-based timing advance measurement for the first candidate cell and a first CG resource of the first candidate cell, and the first candidate cell is configured to a first serving cell; sending a first MAC CE; wherein the first MAC CE indicates the first candidate cell; Among them, the recipient of the first RRC message, as a response to receiving the first MAC CE, performs a switching process; the switching process is free of random access; the switching process is free of random access and depends on at least the time interval between the first moment and the second moment being not greater than the first time threshold; the first moment is related to the UE-based timing advance for the first candidate cell; the second moment is related to the first CG opportunity of the first CG resource.

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