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. A communication node receives a first RRC message, the first RRC message comprising configuration information of a first cell; the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state comprises a first TCI state, and the first TCI state is an activated TCI state in the at least one TCI state; receiving a first MAC CE (Media Access Control CE), wherein the first MAC CE indicates the identifier of the first cell; performing a first handover process as a response to the first MAC CE being received; if at least the first cell is configured with a resource group and the first TA of the first cell is measured, the first handover process is free from random access; if at least the first cell is configured with at least two resource groups, the first handover procedure is not free of random access. According to the method provided by the invention, the random access-free switching performance is improved.

Description

Technical Field

[0001] The present application relates to a transmission method and device in a wireless communication system, and in particular to a random access-free switching method and device. 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 completed the standardization of L1 (Layer 1, layer 1) / L2 (Layer 2, layer 2) triggered mobility (L1 / L2 Triggered Mobility, LTM) through the "Further NR mobility enhancements" work item (Work Item, WI) in Release 18 (R18); among them, it supports the configuration of CG resources of candidate cells and performs RACH-less (random access-free) LTM cell switching on candidate cells. R18 LTM is aimed at intra-DU (Distributed Unit) scenarios.

[0003] To further enhance mobility, conditional LTM and inter-CU (Centralized Unit) LTM have become an important research direction of 3GPP Release 19.

[0004] To further enhance mobility, mobility based on AI (Artificial Intelligence) / ML (Machine Learning) has become an important research direction for 3GPP Release 19 and future protocol versions. Summary of the invention

[0005] In the existing protocol, when the UE receives an LTM Cell Switch Command MAC CE, if the LTM Cell Switch Command MAC CE indicates the timing advance (TA) of the candidate cell, or the UE is configured with UE-based TA measurement and successfully measures the TA for the candidate cell, the UE performs random access-free LTM cell switching. The inventors have found through research that the existing protocol is unreasonable in setting the conditions for random access-free LTM cell switching.

[0006] On the one hand, the existing protocol does not consider the scenario where two TAs are configured in a candidate cell. Since MIMO (Multiple Input Multiple Output) enhancement has completed the standardization of configuring two TAs in a cell, using two TAs for a candidate cell naturally becomes a candidate key technology. However, the existing protocol is not suitable for the scenario where two TAs are configured in a candidate cell, which may cause uplink asynchronization problems and may trigger handover failure.

[0007] On the other hand, in the existing protocol, the UE performs random-free access based on the TCI state indicated by the LTM Cell Switch Command MAC CE. However, since the TCI state can be activated through the Candidate Cell TCI StatesActivation / Deactivation MAC CE, and then the TCI state indicated by the LTM Cell Switch Command MAC CE indicates that there is signaling redundancy in the TCI state, if the LTM Cell Switch Command MAC CE does not indicate the TCI state, how to determine the random-free access is undefined by the protocol; and the SSB indicated by the TCI state indicated by the LTM Cell Switch Command MACCE may not be associated with the CG resources, it is unreasonable to perform random-free access.

[0008] Therefore, it is necessary to enhance the conditions for random access-free LTM cell switching.

[0009] In response to the above problems, the present application provides a solution for random access-free switching. In the description of the above problems, the NR system is used as an example. The present application is also applicable to scenarios of future systems such as 5G-A or 6G, and achieves technical effects similar to those of the NR system; further, although the present application provides a specific implementation method for LTM, the present application can also be used in scenarios such as CHO (Conditional Handover) or CPC (Conditional PSCell (Primary SCG (Secondary Cell Group) Cell) Change) to achieve technical effects similar to those of LTM. Furthermore, adopting a unified design scheme for different scenarios can also help reduce hardware complexity and cost. Furthermore, although the present application provides a specific implementation method for cell-level mobility, the present application can also be used in scenarios of beam-level mobility to achieve technical effects similar to those of cell-level mobility. 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 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] The present application discloses a method in a first node used for wireless communication, characterized by comprising:

[0014] Receive a first RRC message, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI (Transmission Configuration Indicator) state of the first cell, the at least one TCI state including a first TCI state, and the first TCI state is activated; receive a first MAC (Medium Access Control) CE (Control Element), the first MAC CE indicating the identifier of the first cell;

[0015] In response to receiving the first MAC CE, performing a first handover procedure;

[0016] Among them, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0017] As an embodiment, the problem to be solved by the present application includes: how to determine whether the first switching process is free of random access.

[0018] As an embodiment, the characteristics of the above method include: whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured.

[0019] As an embodiment, the characteristics of the above method include: if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access.

[0020] As an embodiment, the characteristics of the above method include: if at least the first cell is configured with at least two resource groups, the first switching process includes random access.

[0021] As an embodiment, the benefits of the above method include: timely triggering of the random access process.

[0022] As an embodiment, the benefits of the above method include: avoiding switching failure.

[0023] As an embodiment, the benefits of the above method include: avoiding uplink asynchronization.

[0024] According to one aspect of the present application, it is characterized in that "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0025] As an embodiment, when the first cell is configured with at least two resource groups, the above method increases the chance of random access-free access.

[0026] As an embodiment, when the first cell is configured with at least two resource groups, the above method reduces random access.

[0027] As an embodiment, when the first cell is configured with at least two resource groups, the above method shortens the switching delay.

[0028] As an embodiment, when the first cell is configured with at least two resource groups, the above method reduces signaling overhead.

[0029] As an embodiment, when the first cell is configured with at least two resource groups, the above method reduces UE power consumption.

[0030] According to one aspect of the present application, it is characterized in that the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0031] As an embodiment, the problem to be solved by the present application includes: how to determine that the first TA is the TA of the resource group associated with the first TCI state.

[0032] As an embodiment, the above method determines that the first TA is the TA of the resource group associated with the first TCI state based on the fact that the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal, thereby solving the above problem.

[0033] As an embodiment, the above method is simple to implement.

[0034] According to one aspect of the present application, it is characterized in that the first RRC message includes a second information block, and the second information block indicates a resource group associated with the first wireless signal.

[0035] As an embodiment, the problem to be solved by the present application includes: how to determine the resource group associated with the first wireless signal.

[0036] As an embodiment, the above method configures the resource group associated with the first wireless signal through the second information block of the first RRC message, thereby solving the above problem.

[0037] As an embodiment, the above method is simple to implement.

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

[0039] Performing UE-based TA measurement for the resource group associated with the first wireless signal;

[0040] The second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; and performing UE-based TA measurement on a resource group associated with the first wireless signal depends on at least the first wireless signal.

[0041] As an embodiment, the problem to be solved by the present application includes: how to perform UE-based TA measurement for the resource group associated with the first wireless signal.

[0042] As an embodiment, the above method implements UE-based TA measurement for a resource group associated with the first wireless signal according to at least the first wireless signal.

[0043] As an embodiment, the above method makes UE-based TA measurement more accurate.

[0044] According to one aspect of the present application, it is characterized in that "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" means: as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0045] As an embodiment, the above method reduces the protocol impact.

[0046] As an embodiment, the above method reduces the complexity of protocol implementation.

[0047] As an embodiment, the above method is simple to implement.

[0048] According to one aspect of the present application, it is characterized by comprising:

[0049] In response to measuring the first TA of the first cell, starting or restarting a first timer;

[0050] The first TA of the first cell is measured to include the first timer running.

[0051] According to one aspect of the present application, it is characterized in that the first TA of the first cell is measured to include a second timer running; the second timer is associated with a first TAG (Timing Advance Group) of the first service cell; the first service cell is configured with two TAGs, and the first TAG is one of the two TAGs; the first TA of the first cell depends on the first TAG.

[0052] As an embodiment, when the first serving cell is configured with two TAGs, how to determine whether the first TA of the first cell is measured.

[0053] As an embodiment, when the first serving cell is configured with two TAGs, how to determine whether the first switching process is free of random access.

[0054] As an embodiment, when the first serving cell is configured with two TAGs, the accuracy with which the first TA of the first cell is measured is improved.

[0055] As an embodiment, when the first serving cell is configured with two TAGs, the condition for the first switching process to be free of random access is optimized.

[0056] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0057] Sending a first RRC message, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state including a first TCI state, and the first TCI state is activated; sending a first MAC CE, the first MAC CE indicating the identifier of the first cell;

[0058] Among them, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0059] According to one aspect of the present application, it is characterized in that "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0060] According to one aspect of the present application, it is characterized in that the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0061] According to one aspect of the present application, it is characterized in that the first RRC message includes a second information block, and the second information block indicates a resource group associated with the first wireless signal.

[0062] According to one aspect of the present application, it is characterized in that the receiver of the first RRC message performs UE-based TA measurement for the resource group associated with the first wireless signal; wherein the second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; and performing UE-based TA measurement for the resource group associated with the first wireless signal depends on at least the first wireless signal.

[0063] According to one aspect of the present application, it is characterized in that "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" means: as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0064] According to one aspect of the present application, it is characterized in that, as a response to measuring the first TA of the first cell, the recipient of the first RRC message starts or restarts a first timer; wherein the first TA of the first cell is measured to include the first timer running.

[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 cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is activated; and receives a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell;

[0067] a first processor, in response to receiving the first MAC CE, performing a first handover procedure;

[0068] Among them, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[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 cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is activated; and sends a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell;

[0071] Among them, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0072] The present application discloses a method in a first node used for wireless communication, characterized by comprising:

[0073] receiving a first RRC message, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell; receiving a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell;

[0074] In response to receiving the first MAC CE, performing a first handover process; wherein the first MAC CE indicates a first TA of the first cell, or the first TA of the first cell is measured;

[0075] Among them, whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state, including: if there is at least one activated TCI state in at least one TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0076] As an embodiment, the problem to be solved by the present application includes: how to determine the condition of random access-free switching.

[0077] As an embodiment, the problem to be solved by the present application includes: how to avoid performing unnecessary random access-free switching.

[0078] As an embodiment, the problem to be solved by the present application includes: how to reduce the failure of random access-free handover.

[0079] As an embodiment, the above method considers whether the TCI state is activated when determining whether to perform random access-free switching.

[0080] As an embodiment, the above method avoids selecting CG resources based on SSB indicated by an inactivated TCI status.

[0081] As an embodiment, the above method rationalizes the conditions for random access-free handover.

[0082] As an embodiment, the above method avoids performing unnecessary random access-free switching.

[0083] As an embodiment, the above method reduces the failure of random access-free handover.

[0084] According to one aspect of the present application, it is characterized in that the activated TCI state is a TCI state activated by any of the former of Candidate CellTCI States Activation / Deactivation MAC CE or the first MAC CE or RRC signaling.

[0085] According to one aspect of the present application, it is characterized in that the activated TCI state is a TCI state activated by Candidate CellTCI States Activation / Deactivation MAC CE.

[0086] According to one aspect of the present application, it is characterized in that the activated TCI state is a TCI state activated by any one of Candidate CellTCI States Activation / Deactivation MAC CE or RRC signaling.

[0087] According to one aspect of the present application, it is characterized in that whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state and whether the SSB corresponding to the activated TCI state is associated with at least one CG resource.

[0088] According to one aspect of the present application, it is characterized in that the first cell is configured with two TAGs; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state and the activated TCI state is associated with the first TA.

[0089] According to one aspect of the present application, it is characterized in that the first cell is configured with two TAGs; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state and the activated TCI state is associated with the first TA and the SSB corresponding to the activated TCI state is associated with at least one CG resource.

[0090] As an embodiment, if there is at least one activated TCI state among at least one TCI state and the activated TCI state is associated with the first TA and the SSB corresponding to the activated TCI state is associated with at least one CG resource, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0091] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0092] Sending a first RRC message, where the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell; sending a first MAC CE, where the first MAC CE indicates the identifier of the first cell;

[0093] In which, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; wherein, the first MAC CE indicates the first TA of the first cell, or the first TA of the first cell is measured by the recipient of the first RRC message; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state including: if there is at least one activated TCI state in at least one of the at least one TCI states, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0094] The present application discloses a first node used for wireless communication, characterized in that it includes:

[0095] A first receiver receives a first RRC message, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell; and receives a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell;

[0096] The first processor performs a first handover process in response to receiving the first MAC CE, wherein the first MAC CE indicates a first TA of the first cell, or the first TA of the first cell is measured;

[0097] Among them, whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state, including: if there is at least one activated TCI state in at least one TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0098] The present application discloses a second node used for wireless communication, characterized in that it includes:

[0099] A second transmitter sends a first RRC message, where the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell; and sends a first MAC CE, where the first MAC CE indicates the identifier of the first cell;

[0100] In which, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; wherein, the first MAC CE indicates the first TA of the first cell, or the first TA of the first cell is measured by the recipient of the first RRC message; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state including: if there is at least one activated TCI state in at least one of the at least one TCI states, the first switching process is free of random access; otherwise, the first switching process is not free of random access. BRIEF DESCRIPTION OF THE DRAWINGS

[0101] 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:

[0102] Figure 1A A flow chart according to an embodiment of the present application is shown;

[0103] Figure 1B A flowchart according to an embodiment of the present application is illustrated;

[0104] Figure 2A schematic diagram of a network architecture according to an embodiment of the present application is shown;

[0105] 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;

[0106] 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;

[0107] Figure 5 A wireless signal transmission flow chart according to an embodiment of the present application is shown;

[0108] Figure 6 A wireless signal transmission flow chart according to another embodiment of the present application is shown;

[0109] Figure 7 A flowchart of TA measurement based on UE according to an embodiment of the present application is shown;

[0110] Figure 8 A schematic diagram showing starting or restarting a first timer according to an embodiment of the present application is shown;

[0111] Fig. 9 A flow chart of a second RRC message according to an embodiment of the present application is shown;

[0112] Fig.10 A structural block diagram of a processing device used in a first node according to an embodiment of the present application is shown;

[0113] Fig.11 A structural block diagram of a processing device used in a second node according to an embodiment of the present application is shown;

[0114] Fig.12 A schematic diagram showing whether the first switching process is free of random access depends on whether the second timer is running according to an embodiment of the present application. DETAILED DESCRIPTION

[0115] 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.

[0116] Example 1A

[0117] Embodiment 1A illustrates a flow chart according to an embodiment of the present application, as shown in the attached Figure 1A Attached Figure 1AIn 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.

[0118] In Example 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 cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is activated; in step 102, a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; in step 103, as a response to the reception of the first MAC CE, a first switching process is performed; wherein whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0119] As an embodiment, the first RRC (Radio Resource Control) message is transmitted via a DCCH (Dedicated Control Channel) message.

[0120] As an embodiment, the first RRC message is transmitted via a DTCH (Dedicated Traffic Channel) message.

[0121] As an embodiment, the first RRC message is transmitted via a SCCH (Sidelink Control Channel) message.

[0122] As an embodiment, the first RRC message is at least one RRC message.

[0123] As an embodiment, the first RRC message is at least one RRC IE (Information Element).

[0124] As an embodiment, the first RRC message is at least one RRC field.

[0125] As an embodiment, the first RRC message belongs to an RRCReconfiguration message.

[0126] As an embodiment, the first RRC message belongs to an RRCResume message.

[0127] As an embodiment, the first RRC message belongs to an RRCSetup message.

[0128] As an embodiment, the first RRC message is an LTM-Candidate IE.

[0129] As an embodiment, the first RRC message is an LTM-Config IE.

[0130] As an embodiment, a CondReconfigToAddModList IE in the first RRC message configures the first cell.

[0131] As an embodiment, an LTM-Config IE in the first RRC message includes the configuration information of the first cell.

[0132] As an embodiment, an LTM-Candidate IE in the first RRC message includes the configuration information of the first cell.

[0133] As an embodiment, an ltm-CandidateToAddModList-r18 field in the first RRC message includes the configuration information of the first cell.

[0134] As an embodiment, an ltm-CandidateConfig-r18 field in the first RRC message includes the configuration information of the first cell.

[0135] As an embodiment, the first RRC message is received in a service cell of the first node.

[0136] As an embodiment, the first cell is a candidate cell.

[0137] As an embodiment, the first cell is a target cell.

[0138] As an embodiment, the first cell is an LTM candidate cell.

[0139] As an embodiment, the first cell is configured to the first service cell.

[0140] As an embodiment, the first cell is configured to the cell group to which the first service cell belongs.

[0141] As an embodiment, the first cell is a candidate for the first serving cell.

[0142] As an embodiment, the first serving cell is a SpCell (Special Cell).

[0143] As an embodiment, the first serving cell is a PCell (Primary Cell).

[0144] As an embodiment, the first serving cell is a PSCell (Primary SCG (Secondary Cell Group) Cell, SCG primary cell).

[0145] As an embodiment, the first serving cell is a source cell.

[0146] As an embodiment, the first serving cell is a source cell of the first switching process.

[0147] As an embodiment, the configuration information of the first cell includes T304.

[0148] As an embodiment, the configuration information of the first cell includes a C (Cell)-RNTI (Radio Network Temporary Identity) of the first node in the first cell.

[0149] As an embodiment, the configuration information of the first cell includes the cell common physical layer configuration of the first cell.

[0150] As an embodiment, the configuration information of the first cell includes a PBCH (Physical Broadcast Channel) configuration of the first cell.

[0151] As an embodiment, the identifier of the first cell is the ltm-CandidateId of the first cell.

[0152] As an embodiment, an ltm-CandidateId IE in the first RRC message indicates the identifier of the first cell.

[0153] As an embodiment, the first field in an LTM-Candidate-r18 IE in the first RRC message indicates the identifier of the first cell.

[0154] As an embodiment, the identifier of the first cell is a PCI (Physical Cell Identifier) ​​of the first cell.

[0155] As an embodiment, a PhysCellId field in a ltm-CandidateConfig-r18 field in the first RRC message indicates the identifier of the first cell.

[0156] As an embodiment, a ltm-DL-OrJointTCI-StateToAddModList in the first RRC message indicates the at least one TCI state of the first cell.

[0157] As an embodiment, a ltm-UL-TCI-StatesToAddModList in the first RRC message indicates the at least one TCI state of the first cell.

[0158] As an embodiment, at least one of a ltm-UL-TCI-StatesToAddModList and a ltm-DL-OrJointTCI-StateToAddModList in the first RRC message indicates the at least one TCI state of the first cell.

[0159] As an embodiment, any one of a ltm-UL-TCI-StatesToAddModList and a ltm-DL-OrJointTCI-StateToAddModList in the first RRC message indicates the at least one TCI state of the first cell.

[0160] As an embodiment, the first TCI state is a UL TCI state.

[0161] As an embodiment, the first TCI state is a UL TCI state or a joint TCI state.

[0162] As an embodiment, the first TCI state is a joint TCI state.

[0163] As an embodiment, the first TCI state being activated means that: when the first switching process is performed, the first TCI state is activated.

[0164] As an embodiment, the first TCI state being activated means that: when determining whether the first switching process is free of random access, the first TCI state is activated.

[0165] As an embodiment, the first TCI state being activated means that: the first TCI state is activated for at least a period of time after the first MAC CE is received.

[0166] As an embodiment, the first TCI state being activated means that: the first TCI state is an activated TCI state.

[0167] As an embodiment, the first TCI state is activated by an RRC signaling.

[0168] As an embodiment, the first TCI state is activated by any one of an RRC signaling, the first MAC CE, or a Candidate Cell TCI States Activation / Deactivation MAC CE.

[0169] As an embodiment, the first TCI state is an activated TCI state of the at least one.

[0170] As an embodiment, the first TCI state is activated by a MAC CE.

[0171] As a sub-embodiment of the above embodiment, the one MAC CE indicates and activates the first TCI state.

[0172] As a sub-embodiment of the above embodiment, the one MAC CE is the first MAC CE.

[0173] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE activates the first TCI state.

[0174] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE indicates the first TCI state.

[0175] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE indicates and activates the first TCI state.

[0176] As a sub-embodiment of the above embodiment, the one MAC CE is not the first MAC CE.

[0177] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE does not indicate the first TCI state.

[0178] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE does not indicate any TCI status.

[0179] As a subsidiary embodiment of the above sub-embodiment, the first MAC CE indicates a joint TCI state and does not indicate any UL TCI state.

[0180] As a subsidiary embodiment of the above sub-embodiment, the one MAC CE is received before the first MAC CE.

[0181] As a subsidiary embodiment of the above sub-embodiment, the one MAC CE is a Candidate CellTCI States Activation / Deactivation MAC CE.

[0182] As a sub-embodiment of the above embodiment, the MAC CE is any one of the first MAC CE or a Candidate Cell TCI States Activation / Deactivation MAC CE.

[0183] As an embodiment, the first TCI state is an activated TCI state of the first cell.

[0184] As an embodiment, the first TCI state is any activated TCI state of the first cell.

[0185] As an embodiment, if the first cell is configured with a resource group, the resource group associated with the first TCI state is the resource group to which the first cell belongs.

[0186] As an embodiment, if the first cell is configured with at least two resource groups, the first RRC message indicates the resource group associated with the first TCI state.

[0187] As an embodiment, if the first cell is configured with at least two resource groups, the first RRC message configures the resource group associated with the first TCI state.

[0188] As an embodiment, if the first cell is configured with at least two resource groups, the resource group associated with the first TCI state is indicated by a tag-Id.

[0189] As an embodiment, if the first cell is configured with at least two resource groups, the resource group associated with the first TCI state is indicated by a tag2-Id.

[0190] As an embodiment, if the first cell is configured with at least two resource groups, the resource group associated with the first TCI state is indicated by a tag-Id-ptr.

[0191] As an embodiment, if the first cell is configured with at least two resource groups, how the first node determines that the first TA is the TA of the resource group associated with the first TCI state depends on the UE implementation.

[0192] As an embodiment, the first MAC CE is received on the first serving cell.

[0193] As an embodiment, the first MAC CE is received on a service cell in the cell group to which the first service cell belongs.

[0194] As an embodiment, the first MAC CE is an LTM Cell Switch Command MAC CE.

[0195] As an embodiment, the MAC subheader in the MAC subPDU to which the first MAC CE belongs includes an eLCID field, and the eLCID field is set to 219.

[0196] As an embodiment, a field in the first MAC CE indicates the identifier of the first cell.

[0197] As an embodiment, the first MAC CE includes a Target Configuration ID field, and the Target Configuration ID field indicates the identifier of the first cell.

[0198] As an embodiment, the first MAC CE includes a Target Configuration ID field, and the value of the Target Configuration ID field is equal to the ltm-CandidateId-1 of the first cell.

[0199] As an embodiment, a field in the first MAC CE indicates the first TCI state.

[0200] As an embodiment, the first MAC CE includes a TCI state ID field, and the TCI stateID field indicates the first TCI state.

[0201] As an embodiment, the first MAC CE includes a UL TCI state ID field, and the TCIstate ID field indicates the first TCI state.

[0202] As an embodiment, the first MAC CE includes a TCI state ID field and a UL TCI state ID field, and any one of the TCI state ID field and the UL TCI state ID field indicates the first TCI state.

[0203] As an embodiment, the first MAC CE triggers the first switching process.

[0204] As an embodiment, as a response to the first MAC CE being received, an indication is given to a higher layer that the first switching process is triggered and the identifier of the first cell.

[0205] As an embodiment, the first switching process is a switching process.

[0206] As an embodiment, the first switching process is an LTM cell switching (Cell Switch) process.

[0207] As an embodiment, the first switching process includes applying at least part of the configuration information of the first cell.

[0208] As an embodiment, the first switching process includes a synchronous reconfiguration (Reconfiguration with sync) process.

[0209] As an embodiment, the first switching process includes a MAC reset.

[0210] As an embodiment, during the first switching process, a higher layer requests to perform a MAC reset.

[0211] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, which means that the number of resource groups configured in the first cell and whether the first TA of the first cell is measured are used to determine whether the first switching process is free of random access.

[0212] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, which means that whether the first switching process is free of random access is related to the number of resource groups configured in the first cell and whether the first TA of the first cell is measured.

[0213] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, which means that the first node determines whether the first switching process is free of random access based on at least the number of resource groups configured in the first cell and whether the first TA of the first cell is measured.

[0214] As an embodiment, during the first switching process, it is determined whether the first switching process is free of random access; whether the first switching process is free of random access depends on the number of resource groups of the first cell and whether the first TA of the first cell is measured.

[0215] As an embodiment, before the MAC is reset, it is determined whether the first switching process is free of random access.

[0216] As an embodiment, after the MAC is reset, it is determined whether the first switching process is free of random access.

[0217] As an embodiment, if at least the first cell is configured with one resource group and the first TA of the first cell is measured, it is determined that the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, it is determined that the first switching process is not free of random access.

[0218] As an embodiment, determining that the first switching process is free of random access means: considering that the first switching process is free of random access.

[0219] As an embodiment, determining that the first switching process is free of random access means: considering that the first switching process free of random access is in progress.

[0220] As an embodiment, the first TA is processed along with the determination that the first switching process is free of random access.

[0221] As an embodiment, before determining that the first switching process is free of random access, the first TA is processed.

[0222] As an embodiment, after determining that the first switching process is free of random access, the first TA is processed.

[0223] As an embodiment, determining that the first switching process is not free from random access refers to: triggering random access in the first switching process.

[0224] As an embodiment, determining that the first switching process is not free from random access refers to: initiating random access during the first switching process.

[0225] As an embodiment, determining that the first switching process is not free from random access means: performing random access in the first switching process.

[0226] As an embodiment, the resource group is a TAG.

[0227] As an embodiment, the resource group is PTAG (Primary TAG).

[0228] As an embodiment, the resource group is used to indicate timing advance.

[0229] As an embodiment, the resource group is a SSB (Synchronization Signal Block, or SS (Synchronization Signal) / PBCH) group.

[0230] As an embodiment, the resource group includes SSB.

[0231] As an embodiment, the resource group includes a TCI state.

[0232] As an embodiment, the number of resource groups configured for the first cell is configurable.

[0233] As an embodiment, the number of resource groups configured for the first cell is explicitly configured.

[0234] As an embodiment, the number of resource groups configured for the first cell is implicitly configured.

[0235] As an embodiment, if the first cell is configured with tag2-id, the first cell is configured with at least two resource groups; if the first cell is not configured with tag2-id, the first cell is configured with one resource group.

[0236] As an embodiment, if the first cell is configured with tag-Id-ptr, the first cell is configured with at least two resource groups; if the first cell is not configured with tag-Id-ptr, the first cell is configured with one resource group.

[0237] As an embodiment, if the first cell is configured with tag-Id-ptr-r18, the first cell is configured with at least two resource groups; if the first cell is not configured with tag-Id-ptr-r18, the first cell is configured with one resource group.

[0238] As an embodiment, if at least one TCI state of the first cell is configured with tag-Id-ptr-r18, the first cell is configured with at least two resource groups; if any TCI state of the first cell is not configured with tag-Id-ptr-r18, the first cell is configured with one resource group.

[0239] As an embodiment, if the first cell is configured with tag2-Id, the first cell is configured with at least two resource groups; if the first cell is not configured with tag2-Id, the first cell is configured with one resource group.

[0240] As an embodiment, if at least one TCI state of the first cell is configured with tag2-Id, the first cell is configured with at least two resource groups; if any TCI state of the first cell is not configured with tag2-Id, the first cell is configured with one resource group.

[0241] As an embodiment, the first TA of the first cell is the TA of the first cell measured by the first node.

[0242] As an embodiment, the first TA of the first cell is any TA of the first cell measured by the first node.

[0243] As an embodiment, the first TA of the first cell is measured by the first node based on the TA measurement of the UE.

[0244] As an embodiment, if the first cell is configured with a resource group, the first TA is the TA of the first cell.

[0245] As an embodiment, if the first cell is configured with a resource group, the first TA is an index value TA that the MAC entity must apply for controlling the timing adjustment amount for the resource group configured for the first cell.

[0246] As an embodiment, if the first cell is configured with at least two resource groups, the TA of each resource group is maintained independently.

[0247] As an embodiment, if the first cell is configured with at least two resource groups, the first node uses the TA of each resource group to perform uplink transmission for each resource group.

[0248] As an embodiment, if the first cell is configured with at least two resource groups, the first node may consider that TAs of any two resource groups of the at least two resource groups are different.

[0249] As an embodiment, if the first cell is configured with at least two resource groups, the first TA is a TA of one resource group among the at least two resource groups.

[0250] As an embodiment, if the first cell is configured with at least two resource groups, the first TA is an index value TA that the MAC entity must apply for controlling the timing adjustment amount for one of the at least two resource groups configured for the first cell.

[0251] As an embodiment, the at least two resource groups are two resource groups.

[0252] As an embodiment, the at least two resource groups are greater than two resource groups.

[0253] As an embodiment, the first TA of the first cell being measured includes: the first TA of the first cell being successfully measured.

[0254] As an embodiment, the first TA of the first cell is measured, including: the first TA of the first cell is measured by performing UE-based TA measurement.

[0255] As an embodiment, the first TA of the first cell is measured, including: a wireless signal of the first serving cell is measured and a wireless signal of the first cell is measured.

[0256] As an embodiment, the first TA of the first cell is measured, including: the downlink frame timing of the first serving cell is measured and the downlink frame timing of the first cell is measured.

[0257] As an embodiment, the first TA of the first cell is measured, including: the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell are measured.

[0258] As an embodiment, the first TA of the first cell is measured, including: the difference between the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell is measured.

[0259] As an embodiment, the first TA of the first cell is measured to include: a TAT associated with a TAG to which the first serving cell belongs is running.

[0260] As an embodiment, the first TA of the first cell is measured to include: the TAT of the first cell is running.

[0261] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, including: if the first TA of the first cell is not measured, the first switching process is not free of random access.

[0262] As an embodiment, the "if at least the first cell is configured with a resource group and the first TA of the first cell is measured, the first switching process is free of random access" means: if the first cell is configured with a resource group and the first TA of the first cell is measured, the first switching process is free of random access.

[0263] As an embodiment, when the first cell is configured with a resource group, if the first TA of the first cell is measured, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0264] As an embodiment, when the first cell is configured with a resource group, if the first TA of the first cell is measured, the first switching process is free of random access; if the first TA of the first cell is not measured, the first switching process is not free of random access.

[0265] As an embodiment, the “if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access” includes: if the first cell is configured with at least two resource groups, the first switching process is not free from random access.

[0266] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" includes: if the first cell is configured with at least two resource groups, whether the first switching process is free of random access depends on whether the first TA of at least the first cell is measured.

[0267] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" includes: if the first cell is configured with at least two resource groups, whether the first switching process is free of random access depends on whether the first TA of at least the first cell is measured and whether the first TA is the TA of the resource group associated with the first TCI state.

[0268] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" includes: when the first cell is configured with at least two resource groups, if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0269] As an embodiment, if the first switching process is free of random access, random access is not triggered in the first switching process.

[0270] As an embodiment, if the first switching process is free of random access, random access is not directly triggered in the first switching process.

[0271] As an embodiment, if the first switching process is free of random access, sending is performed on the first configuration grant; before sending is performed on the first configuration grant, random access is not triggered.

[0272] As an embodiment, the sending on the first configuration grant includes sending a DCCH message on the first configuration grant.

[0273] As an embodiment, the sending on the first configuration grant refers to sending a DCCH message on the first configuration grant.

[0274] As an embodiment, the DCCH message includes an RRCReconfigurationComplete message.

[0275] As an embodiment, the DCCH message is an RRCReconfigurationComplete message.

[0276] As an embodiment, if the transmission performed on the first configuration grant fails, random access is triggered.

[0277] As an embodiment, if the transmission performed on the first configuration grant fails, fall back to random access.

[0278] As an embodiment, if the sending performed on the first configuration grant fails, the first switching process fails.

[0279] As an embodiment, if the first switching process is not free of random access, the first configuration grant is released during the first switching process.

[0280] As an embodiment, if the first switching process is not free from random access, random access is triggered during the first switching process.

[0281] As an embodiment, if the first switching process is not free from random access, random access is performed in the first switching process.

[0282] As an embodiment, the first RRC message indicates the first configuration grant.

[0283] As an embodiment, the type of the first configured grant is configured grant Type 1.

[0284] As an embodiment, the first configuration is granted for LTM.

[0285] As an embodiment, the first configuration is granted and configured to the first cell.

[0286] As an embodiment, the first configured grant is an uplink grant of configured grant Type 1 for LTM.

[0287] As an embodiment, if the first switching process is free of random access, the first TCI state is applied in a designated symbol after the first MAC CE is received.

[0288] As an embodiment, the position of the designated symbol is predefined.

[0289] As an embodiment, the position of the designated symbol is preconfigured.

[0290] As an embodiment, if the first switching process is not free of random access, the first TCI state is applied after the random access process is completed after the first MAC CE is received.

[0291] As an embodiment, applying the first TCI state refers to: adopting the first TCI state.

[0292] As an embodiment, applying the first TCI state refers to: performing uplink sending according to the first TCI state.

[0293] As an embodiment, applying the first TCI state refers to: performing at least the former of uplink sending or downlink receiving according to the first TCI state.

[0294] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0295] As an embodiment, “the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state” means: the TA of the resource group associated with the first TCI state is measured.

[0296] As an embodiment, the first cell is configured with a resource group.

[0297] As an embodiment, the first cell is configured with at least two resource groups.

[0298] As an embodiment, the first TA of the first cell is not measured.

[0299] As an embodiment, the first TA of the first cell is measured.

[0300] As an embodiment, the meaning that the first TA of the first cell is measured includes: the first TA of the first cell is acquired.

[0301] As an embodiment, the meaning that the first TA of the first cell is measured includes: the first TA of the first cell is available.

[0302] As an embodiment, the meaning that the first TA of the first cell is measured includes: the first TA of the first cell is valid.

[0303] As an embodiment, how the first node determines that the first TA of the first cell is measured is determined by the UE implementation.

[0304] As an embodiment, the first TA of the first cell is measured regardless of whether the timeAlignmentTimer corresponding to the TAG configured with the first cell is running.

[0305] As an embodiment, the first TA of the first cell is measured to be related to whether the timeAlignmentTimer corresponding to the TAG configured in the first cell is running; the first cell is configured with a TAG.

[0306] As an embodiment, the first TA of the first cell is measured to be related to whether the timeAlignmentTimer corresponding to the TAG configured in the first cell is running; the first cell is configured with at least two TAGs.

[0307] As an embodiment, the first TA of the first cell is measured based on measurement of a first wireless signal of the first cell.

[0308] As an embodiment, the first TA of the first cell is measured based on measurement of a first wireless signal of the first cell and measurement of a second wireless signal of the first serving cell.

[0309] As an embodiment, the first TA of the first cell is measured based on measurement of a first wireless signal of the first cell, measurement of the second wireless signal of the first serving cell, and a first reference TA.

[0310] As an embodiment, the first TA of the first cell is measured based on a first offset, a measurement of a first wireless signal of the first cell, a measurement of the second wireless signal of the first serving cell, and a first reference TA.

[0311] As an embodiment, measurement of the first wireless signal of the first cell and measurement of the second wireless signal of the first service cell are used to determine the difference between the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell.

[0312] As an embodiment, the difference between the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell is an RSTD.

[0313] As an embodiment, the first TA of the first cell is equal to (a first reference TA + a difference between a reception timing of the first wireless signal of the first cell and a reception timing of the second wireless signal of the first service cell).

[0314] As an embodiment, the first TA of the first cell is equal to (first reference TA+first offset+difference between reception timing of the first wireless signal of the first cell and reception timing of the second wireless signal of the first service cell).

[0315] As an embodiment, the first TA of the first cell is equal to (first reference TA+first offset+difference between reception timing of the first wireless signal of the first cell and reception timing of the second wireless signal of the first service cell+difference between transmission timing of the first wireless signal of the first cell and transmission timing of the second wireless signal of the first service cell).

[0316] As an embodiment, the first service cell is configured with a TAG; the first reference TA is the TA of the first service cell.

[0317] As an embodiment, the first service cell is configured with a TAG; the first reference TA is the TA of the TAG to which the first service cell belongs.

[0318] As an embodiment, the first offset includes a value configured by RRC.

[0319] As an embodiment, the first offset includes a value configured by RRC and a value determined by the first node.

[0320] As an embodiment, the first offset is a value configured by RRC.

[0321] As an embodiment, the first offset includes a difference between a transmission timing of the first wireless signal of the first cell and a transmission timing of the second wireless signal of the first serving cell.

[0322] As an embodiment, the difference between the transmission timing of the first wireless signal of the first cell and the transmission timing of the second wireless signal of the first service cell is preconfigured.

[0323] As an embodiment, the difference between the transmission timing of the first wireless signal of the first cell and the transmission timing of the second wireless signal of the first service cell is measured by the first node.

[0324] As an embodiment, the second wireless signal of the first service cell is an SSB.

[0325] As an embodiment, the second wireless signal of the first service cell is a PBCH.

[0326] As an embodiment, the second wireless signal of the first service cell is an SS.

[0327] As an embodiment, the second wireless signal of the first service cell is any wireless signal of the first service cell.

[0328] As an embodiment, the second wireless signal of the first service cell is a wireless signal of the first service cell.

[0329] As an embodiment, the first wireless signal of the first cell is an SSB.

[0330] As an embodiment, the first wireless signal of the first cell is a PBCH.

[0331] As an embodiment, the first wireless signal of the first cell is an SS.

[0332] As an embodiment, the first wireless signal of the first cell is any wireless signal of the first cell.

[0333] As an embodiment, the first wireless signal of the first cell is a wireless signal of the first cell.

[0334] As an embodiment, the first MAC CE does not indicate the TA of the first cell.

[0335] As an embodiment, the first MAC CE indicates the TA of the first cell, and the TA of the first cell indicated by the first MAC CE is invalid.

[0336] As an embodiment, the first MAC CE indicates the TA of the first cell, and the TA of the first cell indicated by the first MAC CE is not applied.

[0337] As an embodiment, the first MAC CE includes a Timing Advance Command field; the Timing Advance Command field does not indicate a valid TA.

[0338] As an embodiment, the first MAC CE includes a Timing Advance Command field; the Timing Advance Command field does not indicate skipping the random access process for the first cell.

[0339] As an embodiment, the first MAC CE includes a Timing Advance Command field; the Timing Advance Command field is set to FFF.

[0340] As an embodiment, the first MAC CE includes a Timing Advance Command field; the Timing Advance Command field is reserved.

[0341] As an embodiment, the at least two resource groups are two resource groups.

[0342] As an embodiment, the first node supports at least two resource groups.

[0343] As an embodiment, the first node has UE capability of supporting at least two resource groups.

[0344] As an embodiment, the first node supports at least R18.

[0345] As an embodiment, the first node supports R18 and does not support protocol versions after R18.

[0346] As an embodiment, the first node supports R18 and supports protocol versions after R18.

[0347] As an embodiment, the protocol versions after R18 include R19.

[0348] As an embodiment, the protocol version after R18 refers to R19.

[0349] As an embodiment, the protocol version after R18 refers to the 5G protocol version after R18.

[0350] As an embodiment, "if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access" has nothing to do with the protocol version supported by the first node.

[0351] As an embodiment, only when the first node supports at least R18, "if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access."

[0352] As an embodiment, only when the first node supports a protocol version after R18, "if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access."

[0353] Example 1B

[0354] Embodiment 1B illustrates a flow chart according to an embodiment of the present application, as shown in the attached Figure 1B Attached Figure 1BIn 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.

[0355] In Example 1B, the first node in the present application receives a first RRC message in step 101B, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell; in step 102B, a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; in step 103B, as a response to the first MAC CE being received, a first switching process is performed; wherein the first MAC CE indicates a first TA of the first cell, or the first TA of the first cell is measured; wherein whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state including: if there is at least one activated TCI state in at least one of the at least one TCI states, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0356] As an embodiment, the first switching process is free of random access; and there is an activated TCI state among the at least one TCI state.

[0357] As an embodiment, select the SSB-associated CG resource corresponding to the activated TCI state.

[0358] As an embodiment, the first switching process is free of random access; and there are multiple activated TCI states in the at least one TCI state.

[0359] As an embodiment, select the SSB-associated CG resource corresponding to any activated TCI state among the multiple activated TCI states.

[0360] As an embodiment, a SSB-associated CG resource corresponding to a valid (vaild) activated TCI state among the multiple activated TCI states is selected.

[0361] As an embodiment, the SSB-associated CG resources corresponding to the activated TCI state with the highest RSRP among the multiple activated TCI states are selected.

[0362] As an embodiment, the activated TCI state is the UL state.

[0363] As an embodiment, the activated TCI state is a UL state or a joint TCI state.

[0364] As an embodiment, the first cell is configured with a TAG.

[0365] As an embodiment, the first cell is configured with two TAGs.

[0366] As an embodiment, the activated TCI state is a TCI state activated by at least the former of Candidate Cell TCI StatesActivation / Deactivation MAC CE or the first MAC CE or RRC signaling.

[0367] As an embodiment, the activated TCI state is a TCI state activated by any one of Candidate Cell TCI StatesActivation / Deactivation MAC CE or the first MAC CE or RRC signaling.

[0368] As an embodiment, the above method is beneficial to improving the performance of random access-free switching.

[0369] As an embodiment, the activated TCI state is a TCI state activated by any one of the Candidate Cell TCI StatesActivation / Deactivation MAC CE or the first MAC CE.

[0370] As an embodiment, the activated TCI state is a TCI state activated by any one of Candidate Cell TCI StatesActivation / Deactivation MAC CE or RRC signaling.

[0371] As an embodiment, the activated TCI state is a TCI state activated by Candidate Cell TCI StatesActivation / Deactivation MAC CE.

[0372] As an embodiment, the first TA of the first cell is measured.

[0373] As an embodiment, the first MAC CE indicates the first TA of the first cell.

[0374] As an embodiment, the first MAC CE indicates the first TA of the first cell and the first MAC CE indicates the TAG corresponding to the first TA of the first cell; the activated TCI state is a TCI state activated by at least the former of Candidate CellTCI States Activation / Deactivation MAC CE or the first MAC CE or RRC signaling.

[0375] As an embodiment, in the prior art, both the TA and TCI states are indicated by the first MAC CE, and the UE determines the TAG associated with the TA through the TCI state indicated by the first MAC CE. This solution is not applicable to the scenario where the TCI state is activated by at least the former of the Candidate Cell TCIStates Activation / Deactivation MAC CE or the first MAC CE or RRC signaling. In this scenario, how to determine the TAG corresponding to the first TA is a problem to be solved.

[0376] As an embodiment, the above method solves the above problem by using the first MAC CE to indicate the TAG corresponding to the first TA of the first cell.

[0377] As an embodiment, whether the first MAC CE includes a field indicating the activated TCI state is optional.

[0378] As an embodiment, in the prior art, the first MAC CE always includes a field for indicating and activating the TCI state. On the one hand, if a TCI state has been activated by the Candidate Cell TCI States Activation / Deactivation MAC CE, there is signaling redundancy when the first MAC CE indicates and activates the TCI state again. It is necessary to enhance the indication of the TCI state in the first MAC CE.

[0379] As an embodiment, the above method makes random access-free switching more flexible.

[0380] As an embodiment, the above method increases the probability of random access-free switching.

[0381] As an embodiment, the above method reduces signaling overhead.

[0382] As an embodiment, a field in the first MAC CE indicates whether the first MAC CE includes a field indicating the activated TCI state.

[0383] As an embodiment, the above method is simple.

[0384] As an embodiment, a field in the first MAC CE is set to 1 to indicate that the first MAC CE includes a field indicating the activated TCI state; a field in the first MAC CE is set to 0 to indicate that the first MAC CE does not include a field indicating the activated TCI state.

[0385] As an embodiment, whether the first MAC CE includes a domain indicating the activated TCI state is RRC configured.

[0386] As an embodiment, the above method is more flexible.

[0387] As an embodiment, if the RRC configures the first MAC CE to include a field indicating the activated TCI state, a field in the first MAC CE indicates whether the first MAC CE includes a field indicating the activated TCI state.

[0388] As an embodiment, if RRC configures the first MAC CE to include a field indicating the activated TCI state, a field in the first MAC CE is set to 1 to indicate that the first MAC CE includes a field indicating the activated TCI state; a field in the first MAC CE is set to 0 to indicate that the first MAC CE does not include a field indicating the activated TCI state.

[0389] As an embodiment, if RRC configures the first MAC CE to include a field indicating the activated TCI state, a field in the first MAC CE indicates whether the first MAC CE includes a field indicating the activated TCI state; if RRC configures the first MAC CE to not include a field indicating the activated TCI state, a field in the first MAC CE is reserved.

[0390] As an embodiment, the first MAC CE does not indicate the activated TCI state.

[0391] As an embodiment, the first MAC CE does not include a field indicating the activated TCI state.

[0392] As an embodiment, the first MAC CE does not include a field that can be used to indicate the UL TCI State.

[0393] As an embodiment, the first MAC CE does not include the UL TCI State field.

[0394] As an embodiment, whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state and whether the SSB corresponding to the activated TCI state is associated with at least one CG resource.

[0395] As an embodiment, the above method avoids the situation where the SSB indicated by the selected activated TCI status is not associated with the CG resource.

[0396] As an embodiment, if there is at least one activated TCI state among at least one TCI state and the SSB corresponding to the activated TCI state is associated with at least one CG resource, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0397] As an embodiment, the CG resources are CG resources of the first cell for LTM.

[0398] As an embodiment, the SSB corresponding to a TCI state refers to the SSB indicated by the TCI state.

[0399] As an embodiment, the SSB corresponding to a TCI state refers to the SSB configured for the TCI state.

[0400] As an embodiment, the first cell is configured with two TAGs; whether the first switching process is free of random access depends on whether there is at least one activated TCI state in the at least one TCI state and the activated TCI state is associated with the first TA.

[0401] As an embodiment, the first TA is the TA of any TAG of the first cell.

[0402] As an embodiment, the first TA is the TA of the designated TAG of the first cell.

[0403] As an embodiment, if there is at least one activated TCI state among at least one TCI state and the activated TCI state is associated with the first TA, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0404] As an embodiment, for the sake of brevity, the features repeated in this embodiment and other embodiments are not repeated here. In the absence of conflict, the features in other embodiments can be applied to this embodiment. In the absence of conflict, the features in the embodiments of this application and other embodiments can be combined with each other arbitrarily.

[0405] Example 2

[0406] 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 is described. The network architecture 200 is a 5G NR (New Radio) / LTE (Long-Term Evolution) / LTE-A (Long-Term Evolution Advanced) system, or the network architecture 200 is a 5G+ network architecture, or the network architecture 200 is a 6G network architecture, or the network architecture 200 is a network architecture that 3GPP will continue to evolve in the future; the network architecture 200 may be called 5GS (5G System) / EPS (Evolved Packet System), or the network architecture 200 may be called 6GS (6G System); the network architecture 200 includes at least one of UE (User Equipment) 201, RAN (Radio Access Network) 202, core network 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220 and Internet service 230. The network architecture 200 can be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, the network architecture 200 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. The RAN includes a node 203 and other nodes 204. The node 203 provides user and control plane protocol terminations toward the UE 201. The node 203 can be connected to other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. The 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 and receiving node) or some other suitable term. The core network 210 is a 5GC (5G Core Network, 5G core network) / EPC (Evolved Packet Core), or, the core network 210 is a 6GC; the node 203 provides an access point to the core network 210 for the UE 201. Examples of UE 201 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop computer, a personal digital assistant (PDA), a satellite radio, non-terrestrial base station communications, satellite mobile communications, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a drone, an aircraft, a narrowband Internet of Things device, a machine type communication device, a land vehicle, an automobile, a wearable device, or any other similarly functional device.Those skilled in the art may also refer to UE201 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 the core network 210 via an S1 / NG interface. The core network 210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF 213. MME / AMF / SMF 211 is a control node that processes signaling between UE201 and the core network 210. In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which is itself 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.

[0407] As an embodiment, the UE 201 is a user equipment (User Equipment, UE).

[0408] As an embodiment, the UE201 is a base station device (BaseStation, BS).

[0409] As an embodiment, the UE 201 is a relay device.

[0410] As an embodiment, the UE201 is a gateway device.

[0411] As an embodiment, the node 203 corresponds to the second node in the present application.

[0412] As an embodiment, the node 203 is a base station device.

[0413] As an embodiment, the node 203 is a user equipment.

[0414] As an embodiment, the node 203 is a relay device.

[0415] As an embodiment, the node 203 is a gateway device.

[0416] As an embodiment, the node 204 corresponds to the third node in the present application.

[0417] As an embodiment, the node 204 is a base station device.

[0418] As an embodiment, the node 204 is a user equipment.

[0419] As an embodiment, the node 204 is a relay device.

[0420] As an embodiment, the node 204 is a gateway device.

[0421] As an embodiment, the UE 201 maintains connection with the node 203 and the node 204 at the same time.

[0422] As an embodiment, the node 203 and the node 204 are connected via an ideal backhaul.

[0423] As an embodiment, the node 203 and the node 204 are connected via a non-ideal backhaul.

[0424] As an actual example, the node 203 and the node 204 provide wireless resources for the UE 201 at the same time.

[0425] As an actual example, the node 203 and the node 204 do not provide wireless resources for the UE 201 at the same time.

[0426] As an embodiment, the node 203 and the node 204 are the same CU.

[0427] As an embodiment, the node 203 and the node 204 are two different CUs.

[0428] As an embodiment, the node 203 and the node 204 are the same DU.

[0429] As an embodiment, the node 203 and the node 204 are two different DUs.

[0430] Typically, the UE 201 is a user equipment, the node 203 is a base station device, and the node 204 is a base station device.

[0431] Typically, the UE 201 is a user equipment, the node 203 is a user equipment, and the node 204 is a user equipment.

[0432] Typically, the UE 201 is a base station device, the node 203 is a base station device, and the node 204 is a base station device.

[0433] As an embodiment, the user equipment supports low-latency and high-reliability transmission.

[0434] As an embodiment, the user equipment supports at least one of a non-terrestrial network (NTN) or a terrestrial network (Terrestrial Network).

[0435] As an embodiment, the user equipment supports dual connection (Dual Connection, DC).

[0436] As an embodiment, the user equipment supports carrier aggregation.

[0437] As an embodiment, the user equipment supports LTM.

[0438] As an embodiment, the user equipment supports conditional LTM.

[0439] As an embodiment, the user equipment supports inter-CU LTM.

[0440] As an embodiment, the user equipment supports CHO.

[0441] As an embodiment, the user equipment supports CPC.

[0442] As an embodiment, the user equipment supports RACH-less.

[0443] As an embodiment, the user equipment supports m-TRP.

[0444] As an embodiment, the user equipment supports m-TA.

[0445] As an embodiment, the user equipment is a mobile terminal.

[0446] As an embodiment, the user device is a mobile phone or a tablet.

[0447] As an embodiment, the user equipment is an aircraft.

[0448] As an embodiment, the user device is an Internet of Things device, and the Internet of Things device is an Internet of Things terminal or a vehicle-mounted terminal or a ship or an industrial Internet of Things terminal.

[0449] As an embodiment, the user equipment is a test device or a signaling tester.

[0450] As an embodiment, the user equipment is an IAB (Integrated Access and Backhaul)-MT.

[0451] As an embodiment, the base station device supports transmission in a non-terrestrial network.

[0452] As an embodiment, the base station device supports transmission of a terrestrial network.

[0453] As an embodiment, the base station device is a macro cellular (Marco Cellular) base station or a micro cell (MicroCell) base station or a pico cell (Pico Cell) base station or a home base station (Femtocell); the base station device is a base transceiver station (Base Transceiver Station, BTS) or a node B (NodeB, NB) or a gNB or an eNB or an ng-eNB or an en-gNB.

[0454] As an embodiment, the base station device includes at least one of a CU (Centralized Unit) or a DU (Distributed Unit) or a TRP (Transmitter Receiver Point).

[0455] As an embodiment, the base station device is an aerial node, and the aerial node is a flying platform device or a satellite device or an NTN base station.

[0456] As an embodiment, the base station device is a test device or a signaling tester.

[0457] As an embodiment, the base station device is a gateway device.

[0458] As an embodiment, the base station device is an IAB node, and the IAB node is an IAB-node or an IAB-donor or an IAB-donor-CU or an IAB-donor-DU or an IAB-DU or an IAB-MT.

[0459] As an embodiment, the relay device is a relay, and the relay is an L3 relay or an L2 relay or an L1 relay.

[0460] As an embodiment, the relay device is a router.

[0461] As an embodiment, the relay device is a RIS.

[0462] As an embodiment, the relay device is a switch or a gateway device.

[0463] As an embodiment, the relay device is a user equipment.

[0464] As an embodiment, the relay device is a network device.

[0465] Example 3

[0466] Embodiment 3 shows a schematic diagram of an embodiment of a wireless protocol architecture of a user plane and a control plane according to the present application, as shown in the attached Figure 3 shown. Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture 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.

[0467] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0468] As an example, Figure 3The wireless protocol architecture in is applicable to the second node in this application.

[0469] As an embodiment, the first RRC message in the present application is generated in the RRC306.

[0470] As an embodiment, the first MAC CE in the present application is generated by the MAC302 or MAC352.

[0471] As an embodiment, the at least one wireless signal of the first cell in the present application is generated by the PHY301 or PHY351.

[0472] Example 4

[0473] 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.

[0474] 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.

[0475] 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 .

[0476] 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.

[0477] 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 first 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.

[0478] 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.

[0479] 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.

[0480] As an embodiment, the first communication device 450 corresponds to the first node in the present application; the first communication device 450 includes: at least one processor and at least one memory, the at least one memory includes 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, the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state includes a first TCI state, and the first TCI state is activated; receives a first MAC CE, the first MAC CE indicates the identifier of the first cell; as the first MAC In response to the CE being received, a first switching process is executed; wherein, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0481] As an embodiment, the first communication device 450 corresponds to the first node in the present application; the first communication device 450 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generates an action when executed by at least one processor, the action including: receiving a first RRC message, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state including a first TCI state, and the first TCI state is activated; receiving a first MAC CE, the first MAC CE indicating the identifier of the first cell; as a response to the first MAC CE being received, executing a first switching process; wherein whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0482] As an embodiment, the second communication device 410 corresponds to the second node in the present application; 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 with the at least one processor. The second communication device 410 at least: sends a first RRC message, the first RRC message includes configuration information of the first cell; wherein the first RRC message indicates the identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state includes a first TCI state, and the first TCI state is activated; sends a first MAC CE, the first MAC CE indicates the identifier of the first cell; wherein, as a response to the first MAC CE being received, the receiver of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0483] As an embodiment, the second communication device 410 corresponds to the second node in the present application; the second communication device 410 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generates an action when executed by at least one processor, the action including: sending a first RRC message, the first RRC message including configuration information of the first cell; wherein the first RRC message indicates the identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state includes a first TCI state, and the first TCI state is activated; sending a first MAC CE, the first MAC CE indicating the identifier of the first cell; wherein, as a response to the first MAC CE being received, the receiver of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0484] 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 a first RRC message.

[0485] 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 a first RRC message.

[0486] 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 a first MAC CE.

[0487] 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 a first MAC CE.

[0488] As an embodiment, at least one of the antenna 452, the transmitter 454, the transmit processor 468, and the controller / processor 459 is used to send at least one wireless signal of the first cell.

[0489] As an embodiment, at least one of the antenna 420, the receiver 418, the receiving processor 470, and the controller / processor 475 is used to receive at least one wireless signal of the first cell.

[0490] As an embodiment, at least one of the antenna 452, the transmitter 454, the transmit processor 468, and the controller / processor 459 is used to send a first wireless signal.

[0491] As an embodiment, at least one of the antenna 420, the receiver 418, the receiving processor 470, and the controller / processor 475 is used to receive a first wireless signal.

[0492] As an embodiment, the first communication device 450 is a user equipment.

[0493] As an embodiment, the first communication device 450 is a base station device.

[0494] As an embodiment, the first communication device 450 is a relay device.

[0495] As an embodiment, the second communication device 410 is a user equipment.

[0496] As an embodiment, the second communication device 410 is a base station device.

[0497] As an embodiment, the second communication device 410 is a relay device.

[0498] Example 5

[0499] 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.

[0500] for First node U01In step S5101, a first RRC message is received, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state including a first TCI state, and the first TCI state is activated; in step S5102, a first wireless signal is measured; in step S5103, a second wireless signal is measured; in step S5104, a first MAC CE is received, the first MAC CE indicating the identifier of the first cell; in step S5105, as the first MAC In response to the CE being received, the first switching process is executed; in step S5106, it is determined whether the first cell is configured with a resource group; if the first cell is configured with a resource group, the process goes to step S5107(a); otherwise, if the first cell is configured with at least two resource groups, the process goes to step S5107(b); in the step S5107(a), it is determined whether the first TA of the first cell is measured; if the first TA of the first cell is measured, the first switching process is free of random access; otherwise, random access is performed in the first switching process; in the step S5107(b), it is determined whether the first TA of the first cell is measured and whether the first TA is the TA of the resource group associated with the first TCI state; if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, random access is performed in the first switching process.

[0501] for Second node N02 In step S5201, the first RRC message is sent; in step S5202, the second wireless signal is sent; in step S5203, the first MAC CE is sent.

[0502] for The third node N03 , in step S5301, the at least one wireless signal is sent.

[0503] In Example 5, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access; the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0504] As an embodiment, a first RRC message is received, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state among the at least one TCI state; a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; as a response to the reception of the first MAC CE, a first switching process is performed; wherein a resource group is configured for the first cell; if at least the first TA of the first cell is measured, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0505] As an embodiment, a first RRC message is received, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state among the at least one TCI state; a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; as a response to the reception of the first MAC CE, a first switching process is performed; wherein the first cell is configured with at least two resource groups; if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0506] As an embodiment, the first node U01 and the second node N02 are connected wirelessly.

[0507] As an embodiment, the first node U01 and the second node N02 are connected via a wire.

[0508] As an embodiment, the first node U01 and the second node N02 are connected via a Uu port.

[0509] As an embodiment, the first node U01 and the second node N02 are connected via an IAB port.

[0510] As an embodiment, the first node U01 and the second node N02 are connected via a PC5 interface.

[0511] As an embodiment, the first node U01 and the third node N03 are connected wirelessly.

[0512] As an embodiment, the first node U01 and the third node N03 are connected via a wire.

[0513] As an embodiment, the first node U01 and the third node N03 are connected via a Uu port.

[0514] As an embodiment, the first node U01 and the third node N03 are connected via an IAB port.

[0515] As an embodiment, the first node U01 and the third node N03 are connected via a PC5 interface.

[0516] As an embodiment, the third node N03 and the second node N02 are connected via a wireless interface.

[0517] As an embodiment, the third node N03 and the second node N02 are connected via a wired interface.

[0518] As an embodiment, the third node N03 and the second node N02 have an ideal backhaul.

[0519] As an embodiment, there is a non-ideal backhaul between the third node N03 and the second node N02.

[0520] As an embodiment, the third node N03 and the second node N02 are connected via an Xn interface.

[0521] As an embodiment, the third node N03 and the second node N02 belong to the same CU.

[0522] As an embodiment, the third node N03 and the second node N02 belong to different CUs.

[0523] As an embodiment, the third node N03 and the second node N02 belong to the same DU.

[0524] As an embodiment, the third node N03 and the second node N02 belong to different DUs.

[0525] As an embodiment, the third node N03 and the second node N02 are respectively a DU.

[0526] As an embodiment, the second node N02 is a maintaining base station of the first cell.

[0527] As an embodiment, the third node N03 is a maintaining base station of the first service cell.

[0528] As an embodiment, the second node N02 is a source base station, and the third node N03 is a target base station.

[0529] As an embodiment, the second node N02 and the third node N03 are co-located.

[0530] As an embodiment, the second node N02 and the third node N03 are not co-located.

[0531] As an embodiment, at least part of the second node N02 and at least part of the third node N03 are co-located.

[0532] As an embodiment, step S5105 belongs to step S5104.

[0533] As an embodiment, step S5106(a) belongs to step S5104.

[0534] As an embodiment, step S5106(b) belongs to step S5104.

[0535] As an embodiment, the random access between the first node U01 and the third node N03 belongs to the step S5104.

[0536] As an embodiment, random access between the first node U01 and the third node N03 is performed.

[0537] As an embodiment, random access between the first node U01 and the third node N03 is not performed.

[0538] As an embodiment, step S5102 exists.

[0539] As an embodiment, step S5102 does not exist.

[0540] As an embodiment, optionally, in the step S5102, a wireless signal of the first cell is measured.

[0541] As an embodiment, optionally, in the step S5102, the first node U01 measures the at least one wireless signal.

[0542] As an embodiment, the measuring of the first wireless signal includes measuring the receiving timing of the first wireless signal.

[0543] As an embodiment, the reception timing of the first wireless signal is the reception timing of a downlink frame including the first wireless signal.

[0544] As an embodiment, the reception timing of the first wireless signal is the reception timing of a first path of the first wireless signal.

[0545] As an embodiment, the reception timing of the first wireless signal is the reception timing of a downlink frame including a first path of the first wireless signal.

[0546] As an embodiment, measuring the first wireless signal includes measuring the reception quality of the first wireless signal.

[0547] As an embodiment, the reception quality of the first wireless signal is RSRP (Reference Signal Received Power) of the first wireless signal.

[0548] As an embodiment, the reception quality of the first wireless signal is PRSRP (Reference Signal Received Path Power) of the first wireless signal.

[0549] As an embodiment, optionally, in the step S5103, a wireless signal of the first service cell is measured.

[0550] As an embodiment, the measuring of the second wireless signal includes measuring the receiving timing of the second wireless signal.

[0551] As an embodiment, the reception timing of the second wireless signal is the reception timing of a downlink frame including the second wireless signal.

[0552] As an embodiment, the reception timing of the second wireless signal is the reception timing of the first path of the second wireless signal.

[0553] As an embodiment, the reception timing of the second wireless signal is the reception timing of a downlink frame including a first path of the second wireless signal.

[0554] As an embodiment, measuring the second wireless signal includes measuring the reception quality of the second wireless signal.

[0555] As an embodiment, the reception quality of the second wireless signal is the RSRP of the second wireless signal.

[0556] As an embodiment, the reception quality of the second wireless signal is the PRSRP of the second wireless signal.

[0557] As an embodiment, optionally, before the step S5104, the first node U01 sends a measurement report; and the second node N02 receives the measurement report.

[0558] As an embodiment, the second node N02 sends the first MAC CE according to the one measurement report.

[0559] As an embodiment, the one measurement report triggers the first MAC CE.

[0560] As an embodiment, if the first cell is configured with one resource group, UE-based TA measurement is performed for the resource group associated with the first wireless signal and depends on the at least one wireless signal; if the first cell is configured with at least two resource groups, UE-based TA measurement is performed for the resource group associated with the first wireless signal and depends on at least the first wireless signal among the at least one wireless signal.

[0561] As an embodiment, if the first cell is configured with one resource group, the UE-based TA measurement is at the cell level; if the first cell is configured with at least two resource groups, the UE-based TA measurement is at the resource group level.

[0562] As an embodiment, the cell level refers to: cell level.

[0563] As an embodiment, the cell level refers to: cell specific.

[0564] As an embodiment, the resource group level refers to: TAG level.

[0565] As an embodiment, the resource group level refers to: TRP level.

[0566] As an embodiment, the resource group level refers to: TA level.

[0567] As an embodiment, the resource group level refers to: TAG specific.

[0568] As an embodiment, the first cell is configured with a resource group, and the first node U01 supports UE-based TA measurement for the first cell.

[0569] As an embodiment, the first cell is configured with at least two resource groups, and the first node U01 supports UE-based TA measurement for the first cell.

[0570] As an embodiment, the first cell is configured with at least two resource groups, the first node U01 supports UE-based TA measurement for the first cell, and the first node U01 is configured with UE-based TA measurement for the first cell.

[0571] As an embodiment, the first cell is configured with at least two resource groups, the first node U01 supports UE-based TA measurement for the first cell, and the first node U01 is configured with UE-based TA measurement for at least one resource group of the at least two resources configured for the first cell.

[0572] As an embodiment, the first cell is configured with at least two resource groups, the first node U01 supports UE-based TA measurement for the first cell, and the first node U01 is configured with UE-based TA measurement for each resource group of the at least two resources configured for the first cell.

[0573] As an embodiment, the first cell is configured with at least two resource groups, the first node U01 supports UE-based TA measurement for the first cell, and the first node U01 is configured with UE-based TA measurement for only one resource group of the at least two resources configured for the first cell.

[0574] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, which means: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, or if the first cell is configured with at least two resource groups and the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0575] As an embodiment, the above method configures at least two resource groups for the first cell and introduces a condition that the first switching process is free of random access.

[0576] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, which means: if the TA of the resource group associated with the first TCI state is measured, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0577] As an embodiment, the above method is compatible with configuring at least two resource groups in the first cell.

[0578] As an embodiment, when the first cell is configured with at least two resource groups, if the first TA of the first cell is not measured or the first TA is not the TA of the resource group associated with the first TCI state, the first switching process is not free from random access.

[0579] As an embodiment, the first RRC message includes a first information block, the first information block indicating at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of a first wireless signal for the first cell, and the first wireless signal is one of the at least one wireless signal.

[0580] As an embodiment, the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of a first wireless signal for the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with a resource group.

[0581] As an embodiment, the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0582] As a sub-embodiment of the above embodiment, any two resource groups of the at least two resource groups are configured with the same PCI.

[0583] As a sub-embodiment of the above embodiment, the first cell is not configured with SSB-MTC-AdditionalPCI-r17.

[0584] As a sub-embodiment of the above embodiment, any resource group among the at least two resource groups is not configured with SSB-MTC-AdditionalPCI-r17.

[0585] As a sub-embodiment of the above embodiment, at least two resource groups of the at least two resource groups are configured with different PCIs.

[0586] As a sub-embodiment of the above embodiment, at least one resource group among the at least two resource groups is configured with an SSB-MTC-AdditionalPCI-r17 indication.

[0587] As a sub-embodiment of the above embodiment, the first TA is the TA of the resource group associated with the first TCI state only when the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0588] As a sub-embodiment of the above embodiment, if the resource group associated with the first TCI state is different from the resource group associated with the first wireless signal, the first TA is not the TA of the resource group associated with the first TCI state.

[0589] As a sub-embodiment of the above embodiment, if the resource group associated with the first TCI state is different from the resource group associated with the first wireless signal, the first TA is a resource group other than the resource group associated with the first TCI state among the at least two resource groups.

[0590] As a sub-embodiment of the above embodiment, the TA of the first cell is measured by measuring the first wireless signal of the first cell.

[0591] As a sub-embodiment of the above embodiment, the TA of the first cell is measured by measuring the downlink frame to which the first wireless signal of the first cell belongs.

[0592] As a sub-embodiment of the above embodiment, the TA of the first cell is measured by measuring the first wireless signal of the first cell.

[0593] As a sub-embodiment of the above embodiment, the resource group associated with the first TCI state is the resource group associated with the wireless signal indicated by the first TCI state; the wireless signal indicated by the first TCI state is one of the at least one wireless signal.

[0594] As an embodiment, the at least one wireless signal of the first cell is sent.

[0595] As an embodiment, the at least one wireless signal of the first cell is sent by a network.

[0596] As an embodiment, the at least one wireless signal of the first cell is sent by the third node N03.

[0597] As an embodiment, the at least one wireless signal of the first cell is considered to be sent by the first node U01.

[0598] As an embodiment, the first information block explicitly indicates the at least one wireless signal of the first cell.

[0599] As an embodiment, the first information block implicitly indicates the at least one wireless signal of the first cell.

[0600] As an embodiment, the first information block indicates the time domain position of the at least one wireless signal of the first cell.

[0601] As an embodiment, the first information block indicates the time domain position of the at least one wireless signal of the first cell in a half frame.

[0602] As an embodiment, the first information block includes a first bit map, and the bit corresponding to each wireless signal of the at least one wireless signal of the first cell in the first bit map is set to 1.

[0603] As an embodiment, the first information block includes a first bit map, and the at least one wireless signal of the first cell is composed of wireless signals corresponding to all bits set to 1 in the first bit map.

[0604] As an embodiment, the first information block is a LTM-SSB-Config-r18 field.

[0605] As an embodiment, the first information block is a ssb-PositionsInBurst-r18 field in a LTM-SSB-Config-r18 field.

[0606] As an embodiment, the first information block is a shortBitmap field in a ssb-PositionsInBurst-r18 field, and the shortBitmap field indicates the first bit map.

[0607] As an embodiment, the first information block is a mediumBitmap field in a ssb-PositionsInBurst-r18 field, and the shortBitmap field indicates the first bitmap.

[0608] As an embodiment, the first information block is a longBitmap field in a ssb-PositionsInBurst-r18 field, and the shortBitmap field indicates the first bitmap.

[0609] As an embodiment, any one of the at least one wireless signal of the first cell is an SSB.

[0610] As an embodiment, any one of the at least one wireless signal of the first cell is an SS.

[0611] As an embodiment, any one of the at least one wireless signal of the first cell is a PBCH.

[0612] As an embodiment, the first wireless signal of the first cell is an SSB.

[0613] As an embodiment, the first wireless signal of the first cell is an SS.

[0614] As an embodiment, the first wireless signal of the first cell is a PBCH.

[0615] As an embodiment, the first RRC message includes a first information block, the first information block indicating at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal; the first RRC message includes a second information block, and the second information block indicates the resource group associated with the first wireless signal.

[0616] As an embodiment, the second information block is configured with at least two resource groups depending on the first cell.

[0617] As an embodiment, the second information block indicates that the first cell is configured with at least two resource groups.

[0618] As an embodiment, when the first RRC message includes the second information block, the first cell is configured with at least two resource groups.

[0619] As an embodiment, the first RRC message includes the second information block only on the premise that the first cell is configured with at least two resource groups; if the first cell is configured with one resource group, the first RRC message does not include the second information block.

[0620] As an embodiment, the second information block explicitly indicates the resource group associated with the first wireless signal.

[0621] As an embodiment, the second information block implicitly indicates the resource group associated with the first wireless signal.

[0622] As an embodiment, the second information block is configured for the first wireless signal.

[0623] As an embodiment, the second information block indicates a resource group associated with each of the at least one wireless signal.

[0624] As an embodiment, the second information block indicates a resource group associated with at least part of the at least one wireless signal.

[0625] As an embodiment, the second information block indicates, for the first wireless signal, an index of a resource group associated with the first wireless signal.

[0626] As an embodiment, the second information block indicates an index of a resource group associated with the first wireless signal for a wireless signal list, and the wireless signal list includes one or more wireless signals among the at least one wireless signal.

[0627] As an embodiment, the second information block includes a second bit map.

[0628] As an embodiment, the second bit map and the first bit map are equal in size.

[0629] As an embodiment, the second bit map corresponds one-to-one to the first bit map.

[0630] As an embodiment, the first bit in the second bit map and the first bit in the first bit map correspond to the same wireless signal; the second bit in the second bit map and the second bit in the first bit map correspond to the same wireless signal... and so on.

[0631] As an embodiment, if a bit of the first bit map is set to 1, and the bit in the second bit map corresponding to the one bit is set to 1, the wireless signal corresponding to the one bit belongs to the resource group associated with the first wireless signal; otherwise, the wireless signal corresponding to the one bit does not belong to the resource group associated with the first wireless signal.

[0632] As an embodiment, if a bit of the first bit map is set to 1, and the bit in the second bit map corresponding to the one bit is set to 1, the wireless signal corresponding to the one bit belongs to the resource group associated with the first wireless signal; otherwise, the wireless signal corresponding to the one bit belongs to a resource group other than the resource group associated with the first TCI state among the at least two resource groups.

[0633] As an embodiment, the second information block includes a list, wherein the list indicates one or more wireless signals; if a wireless signal is indicated by the list, the wireless signal belongs to the resource group associated with the first wireless signal; otherwise, the wireless signal corresponding to the one bit does not belong to the resource group associated with the first wireless signal.

[0634] As an embodiment, the second information block includes a list, wherein the list indicates one or more wireless signals; if a wireless signal is indicated by the list, the wireless signal belongs to the resource group associated with the first wireless signal; otherwise, the wireless signal corresponding to the one bit belongs to a resource group other than the resource group associated with the first TCI state among the at least two resource groups.

[0635] As an embodiment, a TCI state is associated with the first TA, which means that the first TA is a TA of a TAG, and the TCI state is configured with an index of the TAG.

[0636] As an embodiment, a TCI state is associated with the first TA means that: the TCI state is configured with the index of the TAG corresponding to the first TA.

[0637] As an embodiment, a TCI state is associated with the first TA, which means that the TCI state is associated with a TAG corresponding to the first TA.

[0638] Example 6

[0639] Embodiment 6 illustrates a wireless signal transmission flow chart according to another embodiment of the present application, as shown in the attached Figure 6 It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in this application.

[0640] for First node U01 In step S6101, a first RRC message is received, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is activated; in step S6102, a first wireless signal is measured; in step S6103, a second wireless signal is measured; in step S6104, a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; in step S6105, as a response to the reception of the first MAC CE, a first switching process is performed; in step S6106, it is determined whether the first cell is configured with a resource group and whether the first TA of the first cell is measured; if at least the first cell is configured with a resource group and the first TA of the first cell is measured, the first switching process is free of random access; otherwise, random access is performed in the first switching process.

[0641] for Second node N02 In step S6201, the first RRC message is sent; in step S6202, the second wireless signal is sent; in step S6203, the first MAC CE is sent.

[0642] for The third node N03 , in step S6301, the at least one wireless signal is sent.

[0643] In Example 6, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access; the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" means: as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0644] As an embodiment, a first RRC message is received, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state among the at least one TCI state; a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; as a response to the reception of the first MAC CE, a first switching process is performed; wherein a resource group is configured for the first cell; if at least the first TA of the first cell is measured, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0645] As an embodiment, a first RRC message is received, wherein the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state among the at least one TCI state; a first MAC CE is received, wherein the first MAC CE indicates the identifier of the first cell; as a response to the reception of the first MAC CE, a first switching process is performed; wherein the first cell is configured with at least two resource groups; and the first switching process is not random access-free.

[0646] As an embodiment, the first node U01, the second node N02, and the third node N03 refer to Embodiment 5 and are not described in detail here.

[0647] As an embodiment, the steps S6101 to S6105 refer to Embodiment 5 and are not described in detail here.

[0648] As an embodiment, the steps S6201 to S6203 refer to Embodiment 5 and are not described in detail here.

[0649] As an embodiment, the step S6301 refers to Embodiment 5 and will not be described in detail here.

[0650] As an embodiment, step S6105 belongs to step S6104.

[0651] As an embodiment, step S5106(a) belongs to step S5104.

[0652] As an embodiment, step S5106(b) belongs to step S5104.

[0653] As an embodiment, the random access process between the first node U01 and the third node N03 belongs to the step S6104.

[0654] As an embodiment, random access between the first node U01 and the third node N03 is performed.

[0655] As an embodiment, random access between the first node U01 and the third node N03 is not performed.

[0656] As an embodiment, UE-based TA measurement for the first cell is configured only when the first cell is configured with a resource group.

[0657] As an embodiment, if the first cell is configured with a resource group, if the first RRC message indicates UE-based TA measurement for the first cell, UE-based TA measurement for the first cell is performed; otherwise, UE-based TA measurement for the first cell is not performed.

[0658] As an embodiment, if the first cell is configured with a resource group, if the first RRC message includes ltm-UE-MeasuredTA-ID and the value of ltm-UE-MeasuredTA-ID is equal to the value of ltm-ServingCellUE-MeasuredTA-ID, UE-based TA measurement is performed for the first cell; otherwise, UE-based TA measurement is not performed for the first cell.

[0659] As an embodiment, the first cell is configured with a resource group, and the first node U01 supports UE-based TA measurement for the first cell.

[0660] As an embodiment, the first cell is configured with a resource group, and the first node U01 does not support UE-based TA measurement for the first cell.

[0661] As an embodiment, the first cell is configured with at least two resource groups, and the first node U01 does not support UE-based TA measurement for the first cell.

[0662] As an embodiment, as long as the first cell is configured with at least two resource groups, UE-based TA measurement for the first cell is not configured.

[0663] As an embodiment, as long as the first cell is configured with the at least two resource groups, the first cell is not configured with ltm-UE-MeasuredTA-ID.

[0664] As an embodiment, as long as the first cell is configured with at least two resource groups, UE-based TA measurement for the first cell is not performed.

[0665] As an embodiment, as long as the first cell is configured with at least two resource groups, measurement of the first TA of the first cell is not performed.

[0666] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and the first TA of the first cell is measured, which means: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0667] As an embodiment, if the first node U01 supports R18 and the first node U01 does not support the protocol version after R18, whether the first switching process is free of random access depends on the first TA of the first cell being measured and the number of resource groups configured for the first cell, including: if the first cell is configured with at least two resource groups, the first switching process is not free of random access; if the first node U01 supports the protocol version after R18, whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and the first TA of the first cell being measured, including: if the first cell is configured with at least two resource groups, and if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0668] As an embodiment, the above method reduces the standardization work of R18.

[0669] As an embodiment, the above method reduces the standardization work of R18 while improving the mobility performance of protocol versions after R18.

[0670] Example 7

[0671] Embodiment 7 illustrates a flowchart of TA measurement based on UE according to an embodiment of the present application, as shown in the attached Figure 7 As shown in the attached Figure 7 In the example, the third node N03 includes a first sub-node N031 and a second sub-node N032; it is particularly noted that the order in this example does not limit the signal transmission order and implementation order in the present application.

[0672] for First node U01 , in step S7101, performing UE-based TA measurement for the resource group associated with the first wireless signal; in step S7102, performing UE-based TA measurement for the resource group associated with the first wireless signal in the two resource groups;

[0673] for First child node N031 , in step S73101, at least the first wireless signal among the at least one wireless signal is sent.

[0674] for Second child node N032 , in step S73201, a wireless signal other than at least the first wireless signal among the at least one wireless signal is sent.

[0675] In Example 7, "if at least the first cell is configured with at least two resource groups, the first switching process is not free from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free from random access; otherwise, the first switching process is not free from random access; the resource group associated with the first TCI state is one of the at least two resource groups; the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the first cell. Measurement of a first wireless signal, wherein the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is a TA of a resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal; the first RRC message includes a second information block, and the second information block indicates the resource group associated with the first wireless signal; the second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; performing UE-based TA measurement on the resource group associated with the first wireless signal depends on at least the first wireless signal; the at least two resource groups are two resource groups.

[0676] As an embodiment, the first sub-node N031 is a TRP of the third node N03, and the second sub-node N032 is a TRP of the third node N03.

[0677] As an embodiment, the first sub-node N031 is a DU of the third node N03, and the second sub-node N032 is a DU of the third node N03.

[0678] As an embodiment, the first sub-node N031 and the second sub-node N032 belong to the same CU of the third node N03.

[0679] As an embodiment, the first sub-node N031 and the second sub-node N032 belong to the same DU of the third node N03.

[0680] As an embodiment, the first sub-node N031 and the second sub-node N032 are not co-located.

[0681] As an embodiment, optionally, the first node U01 measures one or more wireless signals among the at least one wireless signal, and sends the measurement result to the second node N02.

[0682] As an embodiment, only at least the first wireless signal among the at least one wireless signal is used to perform UE-based TA measurement for the resource group associated with the first wireless signal.

[0683] As an embodiment, at least the first wireless signal is used to perform UE-based TA measurement for a resource group associated with the first wireless signal.

[0684] As an embodiment, the wireless signal of at least the first wireless signal among the at least one wireless signal is used to perform UE-based TA measurement.

[0685] As an embodiment, the wireless signal of at least the first wireless signal among the at least one wireless signal is used to perform UE-based TA measurement for the resource group associated with the first wireless signal.

[0686] As an embodiment, one wireless signal other than at least the first wireless signal among the at least one wireless signal is measured, and the one wireless signal is not used to perform UE-based TA measurement for the resource group associated with the first wireless signal.

[0687] As an embodiment, step S7102 exists.

[0688] As a sub-embodiment of the above-mentioned embodiment, a wireless signal other than at least the first wireless signal among the at least one wireless signal is measured, and the one wireless signal is used to perform UE-based TA measurement for a resource group other than the resource group associated with the first wireless signal among the at least two resource groups.

[0689] As a sub-embodiment of the above embodiment, at least the first wireless signal among the at least one wireless signal of the first cell is used for UE-based TA measurement of the resource group associated with the first wireless signal; and wireless signals other than at least the first wireless signal among the at least one wireless signal of the first cell are used for UE-based TA measurement of resource groups other than the resource group associated with the first wireless signal among the at least two resource groups.

[0690] As a sub-embodiment of the above embodiment, at least part of the at least one radio signal of the first cell is not used for UE-based TA measurement of the resource group associated with the first radio signal.

[0691] As an embodiment, step S7102 does not exist.

[0692] As a sub-embodiment of the above embodiment, one wireless signal other than the at least the first wireless signal among the at least one wireless signal is measured, and the one wireless signal is not used to perform UE-based TA measurement.

[0693] As a sub-embodiment of the above embodiment, at least the first wireless signal among the at least one wireless signal of the first cell is used for UE-based TA measurement of the resource group associated with the first wireless signal; wireless signals other than at least the first wireless signal among the at least one wireless signal of the first cell are not used to perform UE-based TA measurement.

[0694] As a sub-embodiment of the above embodiment, only at least the first radio signal among the at least one radio signal of the first cell is used for UE-based TA measurement.

[0695] As a sub-embodiment of the above embodiment, at least part of the at least one radio signal of the first cell is not used for UE-based TA measurement.

[0696] Example 8

[0697] Embodiment 8 illustrates a schematic diagram of starting or restarting the first timer according to an embodiment of the present application, as shown in the attached figure. Figure 8 shown.

[0698] for First node U01 In step S8101, the first TA of the first cell is measured; in step S8102, accompanying the measurement of the first TA of the first cell, a first timer is started or restarted.

[0699] In Embodiment 8, whether the first handover process is free of random access depends on whether the first timer is running.

[0700] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell, whether the first TA of the first cell is measured, and whether the first timer is running.

[0701] As an embodiment, the "if at least the first cell is configured with a resource group and the first TA of the first cell is measured, the first switching process is free of random access" means: if at least the first cell is configured with a resource group and the first TA of the first cell is measured and the first timer is running, the first switching process is free of random access.

[0702] As an embodiment, when the first cell is configured with a resource group, if at least the first TA of the first cell is measured and the first timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0703] As an embodiment, the "if at least the first cell is configured with a resource group and the first TA of the first cell is measured, the first switching process is free of random access" means: if the first cell is configured with a resource group and the first TA of the first cell is measured and the first timer is running, the first switching process is free of random access.

[0704] As an embodiment, when the first cell is configured with a resource group, if the first TA of the first cell is measured and the first timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0705] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running, the first switching process is free of random access.

[0706] As an embodiment, when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0707] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running, the first switching process is free of random access.

[0708] As an embodiment, when the first cell is configured with at least two resource groups, if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0709] As an embodiment, if the first cell is configured with at least two resource groups and the first timer is not running, regardless of whether the timeAlignmentTimer corresponding to the resource group other than the resource group associated with the first wireless signal in the at least two resource groups is running, the first switching process is inevitable random access.

[0710] As an embodiment, the first TA of the first cell is measured to include the first timer running.

[0711] As an embodiment, the first TA of the first cell is considered to be measured only when the first timer is running.

[0712] As an embodiment, if the first timer is not running, the first TA of the first cell is not considered to be measured.

[0713] As an embodiment, if the first cell is configured with at least two resource groups and the first timer is not running, regardless of whether the timeAlignmentTimer corresponding to the resource group other than the resource group associated with the first wireless signal in the at least two resource groups is running, the first TA of the first cell is not considered to be measured.

[0714] As an embodiment, the measuring of the first TA of the first cell includes: performing UE-based TA measurement for a resource group associated with the first wireless signal; and the first cell is configured with at least two resource groups.

[0715] As an embodiment, the measuring the first TA of the first cell includes: performing UE-based TA measurement for the first cell; and the first cell is configured with at least two resource groups.

[0716] As an embodiment, the measuring of the first TA of the first cell includes: measuring the downlink reference signal time difference between the first cell and the first serving cell.

[0717] As an embodiment, the measuring of the first TA of the first cell includes: measuring the downlink reference signal time difference between the first cell and the first serving cell, and determining the first TA of the first cell according to the downlink reference signal time difference and the TA of the first serving cell.

[0718] As an embodiment, the first timer is running accompanying the measuring of the first TA of the first cell.

[0719] As an embodiment, concomitant with measuring the first TA of the first cell, if the first timer is running, the first timer is restarted.

[0720] As an embodiment, accompanying the measuring of the first TA of the first cell, the first timer is not running.

[0721] As an embodiment, concomitant with measuring the first TA of the first cell, if the first timer is not running, starting the first timer.

[0722] As an embodiment, the accompanying measurement of the first TA of the first cell refers to: when the time difference of the downlink reference signal between the first cell and the first serving cell is measured.

[0723] As an embodiment, the accompanying measurement of the first TA of the first cell refers to: when the first TA of the first cell is determined according to the downlink reference signal time difference and the TA of the first serving cell.

[0724] As an embodiment, the accompanying measurement of the first TA of the first cell refers to: when the first TA of the first cell is measured.

[0725] As an embodiment, the accompanying measurement of the first TA of the first cell refers to: when the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell are measured.

[0726] As an embodiment, the accompanying measurement of the first TA of the first cell refers to: when the difference between the reception timing of the first wireless signal of the first cell and the reception timing of the second wireless signal of the first service cell is measured.

[0727] As an embodiment, the first node U01 measures the first TA of the first cell by performing UE-based TA measurement for the first cell.

[0728] As an embodiment, the first node U01 measures the first TA of the first cell by performing UE-based TA measurement of the resource group associated with the first wireless signal of the first cell.

[0729] As an embodiment, the first timer is a MAC sublayer timer.

[0730] As an embodiment, the first TA of the first cell is measured to include: when the first MAC CE is received, the first timer is running.

[0731] As an embodiment, the first TA of the first cell is measured to include: after the first MAC CE is received, at the first CG (Configured Grant) occasion (Occasion) of the first configured grant associated with the wireless signal indicated by the first TCI state, the first timer is running.

[0732] As an embodiment, expiration of the first timer triggers measurement of the first TA of the first cell.

[0733] As an embodiment, when the first timer expires, measurement of the first TA of the first cell begins.

[0734] As an embodiment, when the first timer expires, whether to start measuring the first TA of the first cell depends on UE implementation.

[0735] As an embodiment, when the first timer expires, the UE decides whether to start measuring the first TA of the first cell.

[0736] As an embodiment, the first cell is configured with at least two resource groups, and the first timer is associated with the resource group associated with the first wireless signal; the "if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access; otherwise, the first switching process is not free of random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0737] As an embodiment, the first cell is configured with a resource group, and the first timer is associated with the first cell.

[0738] Example 9

[0739] Embodiment 9 illustrates a flowchart of a second RRC message according to an embodiment of the present application, as shown in the attached Fig. 9 shown.

[0740] for Second node N02 , in step S9201, receiving a second RRC message;

[0741] for The third node N03, In step S9301, the second RRC message is sent;

[0742] In Embodiment 9, the second RRC message indicates at least the first radio signal from among the at least one radio signal of the first cell.

[0743] As an embodiment, the second RRC message is sent via the Xn interface.

[0744] As an embodiment, the second RRC message is an XnAP message.

[0745] As an embodiment, the second RRC message belongs to a HandoverCommand message.

[0746] As an embodiment, the second RRC message belongs to an RRCReconfiguration message.

[0747] As an embodiment, the second RRC message belongs to a handoverCommandMessage domain.

[0748] As an embodiment, the second RRC message includes the second information block, and the second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell.

[0749] As an embodiment, the second RRC message includes at least one information block, and the at least one information block indicates at least the first wireless signal from the at least one wireless signal of the first cell.

[0750] As a sub-embodiment of the above embodiment, the at least one information block includes at least one RRC IE.

[0751] As a sub-embodiment of the above embodiment, the at least one information block includes at least one RRC domain.

[0752] As a sub-embodiment of the above embodiment, the at least one information block is the second information block.

[0753] As a sub-embodiment of the above embodiment, the at least one information block is not the second information block.

[0754] As an embodiment, the second node N02 sends the first RRC message in response to the second RRC message being received.

[0755] Example 10

[0756] Embodiment 10 illustrates a structural block diagram of a processing device used in a first node according to an embodiment of the present application; Fig.10 As shown in the attached Fig.10 In the example, the processing device 1000 in the first node includes a first receiver 1001 and a first processor 1002.

[0757] A first receiver 1001 receives a first RRC message, where the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, where the at least one TCI state includes a first TCI state, and the first TCI state is activated; and receives a first MAC CE, where the first MAC CE indicates the identifier of the first cell;

[0758] The first processor 1002 performs a first handover process in response to receiving the first MAC CE;

[0759] In Example 10, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0760] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0761] As an embodiment, the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0762] As an embodiment, the first RRC message includes a second information block, and the second information block indicates a resource group associated with the first wireless signal.

[0763] As an embodiment, the first processor 1002 performs UE-based TA measurement for the resource group associated with the first wireless signal; wherein the second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; and performing UE-based TA measurement for the resource group associated with the first wireless signal depends on at least the first wireless signal.

[0764] As an embodiment, the “if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access” means: as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0765] As an embodiment, the first processor 1002, in response to measuring the first TA of the first cell, starts or restarts a first timer; wherein the first TA of the first cell is measured including the first timer running.

[0766] As an embodiment, the first processor 1002 includes a first receiver 1001 .

[0767] As an embodiment, the first processor 1002 includes a first transmitter.

[0768] As an embodiment, the first processor 1002 includes a first receiver 1001 and a first transmitter.

[0769] As an embodiment, the first receiver 1001 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.

[0770] As an embodiment, the first receiver 1001 includes the attached Figure 4 At least an antenna 452 and a receiver 454.

[0771] As an embodiment, the first transmitter includes the attached Figure 4 At least one of the antenna 452 or the transmitter 454 or the multi-antenna transmit processor 457 or the transmit processor 468 or the controller / processor 459 or the memory 460 or the data source 467.

[0772] As an embodiment, the first transmitter includes the attached Figure 4 At least antenna 452 and transmitter 454.

[0773] Embodiment 11

[0774] Embodiment 11 illustrates a structural block diagram of a processing device used in a second node according to an embodiment of the present application; Fig.11 As shown in the attached Fig.11 In the embodiment, the processing device 1100 in the second node includes a second transmitter 1101.

[0775] The second transmitter 1101 sends a first RRC message, where the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, where the at least one TCI state includes a first TCI state, and the first TCI state is activated; sends a first MAC CE, where the first MAC CE indicates the identifier of the first cell;

[0776] In Example 11, as a response to the first MAC CE being received, the receiver of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0777] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

[0778] As an embodiment, the first RRC message includes a first information block, the first information block indicates at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

[0779] As an embodiment, the first RRC message includes a second information block, and the second information block indicates a resource group associated with the first wireless signal.

[0780] As an embodiment, the receiver of the first RRC message performs UE-based TA measurement for the resource group associated with the first wireless signal; wherein the second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; and performing UE-based TA measurement for the resource group associated with the first wireless signal depends on at least the first wireless signal.

[0781] As an embodiment, the “if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access” means: as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

[0782] As an embodiment, in response to measuring the first TA of the first cell, the recipient of the first RRC message starts or restarts a first timer; wherein the first TA of the first cell is measured including the first timer running.

[0783] As an embodiment, the second transmitter 1101 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.

[0784] As an embodiment, the second transmitter 1101 includes the attached Figure 4 At least antenna 420 and transmitter 418.

[0785] Example 12

[0786] Embodiment 12 illustrates a schematic diagram of whether the first switching process is free of random access depending on whether the second timer is running according to an embodiment of the present application, as shown in the attached figure. Fig.12 shown.

[0787] In Example 12, whether the first switching process is free of random access depends on whether the second timer is running; the second timer is associated with the first TAG of the first service cell; the first service cell is configured with two TAGs, and the first TAG is one of the two TAGs; the first TA of the first cell is measured based on the first TAG.

[0788] As an embodiment, the second timer is the timeAlignmentTimer corresponding to the first TAG.

[0789] As an embodiment, the first service cell is configured with tag2-Id.

[0790] As an embodiment, at least one TCI state of the first service cell is configured with tag2-Id.

[0791] As an embodiment, the first TA of the first cell is measured based on the first TAG, which means that: the first TA of the first cell is measured based on the TA of the first TAG and the second wireless signal of the first service cell; the second wireless signal of the first service cell is configured to the first TAG.

[0792] As an embodiment, the first reference TA in Embodiment 1 is the TA of the first TAG.

[0793] As an embodiment, the first reference TA in Embodiment 1 is the TA of the TAG to which the second wireless signal belongs.

[0794] As an embodiment, the first reference TA in Embodiment 1 is the TA of the TAG associated with the second wireless signal.

[0795] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell, whether the first TA of the first cell is measured, whether the first timer is running, and whether the second timer is running.

[0796] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running and the second timer is running, the first switching process is free of random access.

[0797] As an embodiment, when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running and the second timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0798] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running and the second timer is running, the first switching process is free of random access.

[0799] As an embodiment, when the first cell is configured with at least two resource groups, if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the first timer is running and the second timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0800] As an embodiment, whether the first switching process is free of random access depends on the number of resource groups configured in the first cell, whether the first TA of the first cell is measured, and whether the second timer is running.

[0801] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the second timer is running, the first switching process is free of random access.

[0802] As an embodiment, when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the second timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0803] As an embodiment, the "if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is free of random access" means: if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the second timer is running, the first switching process is free of random access.

[0804] As an embodiment, when the first cell is configured with at least two resource groups, if the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state and the second timer is running, the first switching process is free of random access; otherwise, the first switching process is not free of random access.

[0805] As an embodiment, if the second timer is not running, regardless of whether the timeAlignmentTimer corresponding to a TAG other than the first TAG in the two TAGs is running, the first switching process is inevitably subject to random access.

[0806] As an embodiment, the first switching process is free of random access and has nothing to do with whether the timeAlignmentTimer corresponding to a TAG other than the first TAG among the two TAGs is running.

[0807] As an embodiment, the first TA of the first cell is measured to include the second timer running.

[0808] As an embodiment, the first TA of the first cell is considered to be measured only when the second timer is running.

[0809] As an embodiment, if the second timer is not running, regardless of whether the timeAlignmentTimer corresponding to a TAG other than the first TAG in the two TAGs is running, it is not considered that the first TA of the first cell is measured.

[0810] As an embodiment, the first TA of the first cell is measured regardless of whether the timeAlignmentTimer corresponding to a TAG other than the first TAG of the two TAGs is running.

[0811] 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.

[0812] 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 cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state in the at least one TCI state; and receives a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell; a first processor, in response to receiving the first MAC CE, performing a first handover procedure; Among them, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

2. The first node according to claim 1, characterized in that: The "if at least the first cell is configured with at least two resource groups, the first switching process is not exempted from random access" means: when the first cell is configured with at least two resource groups, if at least the first TA of the first cell is measured and the first TA is the TA of the resource group associated with the first TCI state, the first switching process is exempted from random access; otherwise, the first switching process is not exempted from random access; the resource group associated with the first TCI state is one of the at least two resource groups.

3. The first node according to claim 2, characterized in that: The first RRC message includes a first information block, the first information block indicating at least one wireless signal of the first cell; the first TA of the first cell is measured based on the measurement of the first wireless signal of the first cell, and the first wireless signal is one of the at least one wireless signal; the first cell is configured with at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state, and the resource group associated with the first TCI state is the same as the resource group associated with the first wireless signal.

4. The first node according to claim 3, characterized in that: The first RRC message includes a second information block, and the second information block indicates a resource group associated with the first wireless signal.

5. The first node according to claim 4, characterized in that: include: The first processor performs UE-based TA measurement on a resource group associated with the first wireless signal; The second information block indicates at least the first wireless signal from the at least one wireless signal of the first cell; and performing UE-based TA measurement on a resource group associated with the first wireless signal depends on at least the first wireless signal.

6. The first node according to claim 1, characterized in that: The phrase “if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access” means that as long as the first cell is configured with at least two resource groups, the first switching process is not free of random access.

7. The first node according to any one of claims 1 to 6, characterized in that: include: The first receiver measures the first TA of the first cell; The first processor, accompanying the measuring of the first TA of the first cell, starts or restarts a first timer; The first TA of the first cell is measured to include the first timer running.

8. The first node according to any one of claims 1 to 7, characterized in that: The first TA of the first cell is measured to include a second timer running; the second timer is associated with the first TAG of the first serving cell; The first serving cell is configured with two TAGs, and the first TAG is one of the two TAGs; the first TA of the first cell depends on the first TAG.

9. A method in a first node for wireless communication, characterized in that: include: receiving a first RRC message, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, the at least one TCI state including a first TCI state, the first TCI state being an activated TCI state in the at least one TCI state; receiving a first MAC CE, the first MAC CE indicating the identifier of the first cell; In response to receiving the first MAC CE, performing a first handover procedure; Among them, whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

10. 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 cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, wherein the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state in the at least one TCI state; and sends a first MAC CE, wherein the first MAC CE indicates the identifier of the first cell; Among them, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

11. A method in a second node for wireless communication, characterized in that: include: Sending a first RRC message, where the first RRC message includes configuration information of a first cell; wherein the first RRC message indicates an identifier of the first cell and at least one TCI state of the first cell, where the at least one TCI state includes a first TCI state, and the first TCI state is an activated TCI state in the at least one TCI state; sending a first MAC CE, where the first MAC CE indicates the identifier of the first cell; Among them, as a response to the first MAC CE being received, the recipient of the first RRC message performs a first switching process; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured; whether the first switching process is free of random access depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured, including: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first switching process is free of random access; if at least the first cell is configured with at least two resource groups, the first switching process is not free of random access.

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