A method and apparatus in a communication node used for wireless communication

Abstract

A method and apparatus in a communication node used for wireless communication are disclosed. The communication node receives a first RRC message comprising configuration information of a first cell; the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being an activated one of the at least one TCI state; receives a first MAC CE indicating the identity of the first cell; performs a first handover procedure in response to the first MAC CE being received; the first handover procedure is random access free if at least the first cell is configured with one resource group and the first TA of the first cell is measured; the first handover procedure is not random access free if at least the first cell is configured with at least two resource groups. The method improves the performance of random access free handover.

Description

TECHNICAL FIELD

[0001] The present application relates to a transmission method and device in a wireless communication system, in particular to a handover method and device without random access. BACKGROUND

[0002] With the continuous development of wireless communication, the requirements for mobility, transmission delay and system capacity are becoming higher and higher. 3GPP has completed the standardization work of L1 / L2 Triggered Mobility (LTM) in Release 18 (R18) through the “NR (New Radio) Mobility Further Enhancements” work item (WI); among them, R18 LTM supports the configuration of CG resources of candidate cells and performs RACH-less (random access) LTM cell switch on candidate cells, and R18 LTM is for intra-DU (Distributed Unit) scenarios.

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

[0004] In order to further enhance mobility, AI (Artificial Intelligence) / ML (Machine Learning) based mobility has become an important research direction of 3GPP Release 19 and future protocol versions. SUMMARY

[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 based on the UE's TA measurement and successfully measures the TA of the candidate cell, the UE performs LTM cell switch without random access. The inventors found through research that the existing protocol is not reasonable for setting the conditions for LTM cell switch without random access.

[0006] On the one hand, the existing protocol does not consider the scenario that a candidate cell is configured with two TAs, since MIMO (Multiple Input Multiple Output) enhancement has completed the standardization work of configuring two TAs for one cell, it is natural to adopt two TAs for one candidate cell as a candidate key technology. However, the existing protocol is not applicable to the scenario that one candidate cell is configured with two TAs, which may cause uplink synchronization problems, and in turn may trigger a handover failure.

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

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

[0009] To solve the above problems, the present application provides a solution for random access-free handover. In the above problem description, the NR system is taken as an example, and the present application is also applicable to scenarios of future systems such as 5G-A or 6G, and achieves similar technical effects as the NR system. Further, although the present application gives specific embodiments for LTM, it can also be used in scenarios such as CHO (Conditional Handover) or CPC (Conditional PSCell (Primary SCG (Secondary Cell Group) Cell) Change), and achieves similar technical effects as LTM. Further, the unified design scheme for different scenarios also helps to reduce hardware complexity and cost. Further, although the present application gives specific embodiments for cell-level mobility, it can also be used in scenarios of beam-level mobility, and achieves similar technical effects as cell-level mobility. Further, although the present application is initially intended for Uu air interface, it can also be used for PC5 interface, and achieves similar technical effects as the Uu air interface. Further, although the present application is initially intended for a terminal and base station scenario, it is also applicable to V2X (Vehicle-to-Everything) scenarios, terminal-to-relay and relay-to-base station communication scenarios, and achieves similar technical effects as in the terminal and base station scenario. Further, although the present application is initially intended for a terminal and base station scenario, it is also applicable to IAB (Integrated Access and Backhaul) communication scenarios, and achieves similar technical effects as in the terminal and base station scenario. Further, although the present application is initially intended for a TN (Terrestrial Network) scenario, it is also applicable to NTN (Non-Terrestrial Network) communication scenarios, and achieves similar technical effects as in the TN scenario. In addition, the unified solution for different scenarios also helps to reduce hardware complexity and cost.

[0010] As an embodiment, the explanation of the terms in the present application refers to the definition of the specification protocol TS38 series of 3GPP.

[0011] As an embodiment, the explanation of the terms in the present application refers to the definition of the specification protocol TS37 series of 3GPP.

[0012] It should be noted that the embodiments and features in the embodiments of any node in the present application can be applied to any other node without conflict. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict.

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

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

[0015] in response to the first MAC CE being received, performing a first handover procedure;

[0016] wherein whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depending on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured comprises: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free.

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

[0018] As an embodiment, the features of the above method include: whether the first handover procedure is random access free depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured.

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

[0020] As an embodiment, the features of the above method include: if at least the first cell is configured with at least two resource groups, the first handover procedure comprises random access.

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

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

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

[0024] According to an aspect of the present application, it is characterized in that, the "if at least the first cell is configured at least two resource groups, the first handover procedure is not exempted from random access" means: when the first cell is configured 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 handover procedure is exempted from random access; otherwise, the first handover procedure 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 at least two resource groups, the above method increases the opportunity of random access exemption.

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

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

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

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

[0030] According to an 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, the first wireless signal is one of the at least one wireless signal; the first cell is configured at least two resource groups; the first TA is the TA of the resource group associated with the first TCI state depends on the resource group associated with the first TCI state and the resource group associated with the first wireless signal are the same.

[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 method determines the first TA as the TA of the resource group associated with the first TCI state according to 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 method is simple to implement.

[0034] According to an aspect of the present application, the first RRC message comprises a second information block, and the second information block indicates the 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 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 method is simple to implement.

[0038] According to an aspect of the present application, it comprises:

[0039] Perform UE-based TA measurement on 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 the resource group associated with the first wireless signal depends on the 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 on the resource group associated with the first wireless signal.

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

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

[0044] According to an aspect of the present application, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" means that as long as the first cell is configured with at least two resource groups, the first handover procedure is not random access free.

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

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

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

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

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

[0050] Wherein, the first TA of the first cell is measured to include that the first timer is 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 that a second timer is running; the second timer is associated with a first TAG (Timing Advance Group / Timing Adjustment Group) of a first serving cell; the first serving cell is configured with two TAGs, the first TAG is one of the two TAGs; the first TA of the first cell depends on the first TAG.

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

[0053] As one embodiment, when the first serving cell is configured with two TAGs, how to determine whether the first handover procedure is random access free.

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

[0055] As one embodiment, when the first serving cell is configured with two TAGs, the condition for the first handover procedure to be random access free is optimized.

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

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

[0058] wherein, as a response to the reception of the first MAC CE, a receiver of the first RRC message performs a first handover procedure; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured comprises that the first handover procedure is random access free if at least the first cell is configured one resource group and the first TA of the first cell is measured; the first handover procedure is not random access free if at least the first cell is configured at least two resource groups.

[0059] According to an aspect of the present application, the “if at least the first cell is configured at least two resource groups, the first handover procedure is not random access free” means that when the first cell is configured at least two resource groups, the first handover procedure is random access free if at least the first TA of the first cell is measured and the first TA is a TA of a resource group associated with the first TCI state; otherwise, the first handover procedure is not random access free; the resource group associated with the first TCI state is one of the at least two resource groups.

[0060] According to an aspect of the present application, the first RRC message comprises a first information block, the first information block indicates at least one radio signal of the first cell; the first TA of the first cell is measured based on a measurement for a first radio signal of the first cell, the first radio signal is one of the at least one radio signal; the first cell is configured at least two resource groups; the first TA is a TA of a resource group associated with the first TCI state depends on that the resource group associated with the first TCI state and a resource group associated with the first radio signal are same.

[0061] According to an aspect of the present application, the first RRC message comprises a second information block, the second information block indicates a resource group associated with the first radio signal.

[0062] According to an aspect of the present application, the receiver of the first RRC message performs a UE-based TA measurement for the resource group associated with the first radio signal; wherein the second information block indicates at least the first radio signal from the at least one radio signal of the first cell; the UE-based TA measurement for the resource group associated with the first radio signal depends on the at least the first radio signal.

[0063] According to an aspect of the present application, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" means that as long as the first cell is configured with at least two resource groups, the first handover procedure is not random access free.

[0064] According to an aspect of the present application, the "in response to measuring the first TA of the first cell, the recipient of the first RRC message starts or restarts a first timer" means that measuring the first TA of the first cell includes the first timer running.

[0065] The present application discloses a first node for wireless communication, characterized by comprising:

[0066] a first receiver configured to receive a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; and receive a first MAC CE, the first MAC CE indicating the identity of the first cell;

[0067] a first processor configured to perform a first handover procedure in response to the first MAC CE being received;

[0068] wherein whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depending on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured includes: if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; and if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free.

[0069] The present application discloses a second node for wireless communication, characterized by comprising:

[0070] a second transmitter configured to transmit a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; and transmit a first MAC CE, the first MAC CE indicating the identity of the first cell;

[0071] In response to the first MAC CE being received, a first handover procedure is performed by a receiver of the first RRC message; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured includes that the first handover procedure is random access free if at least one resource group is configured for the first cell and the first TA of the first cell is measured; the first handover procedure is not random access free if at least two resource groups are configured for the first cell.

[0072] A method in a first node for wireless communication is disclosed, comprising:

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

[0074] in response to the first MAC CE being received, performing a first handover procedure; wherein the first MAC CE indicates a first TA of the first cell, or the first TA of the first cell is measured;

[0075] wherein whether the first handover procedure is random access free depends on whether at least one activated TCI state exists in the at least one TCI state; whether the first handover procedure is random access free depends on whether at least one activated TCI state exists in the at least one TCI state includes that the first handover procedure is random access free if at least one activated TCI state exists in the at least one TCI state; otherwise, the first handover procedure is not random access free.

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

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

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

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

[0080] As one embodiment, the above method avoids selecting CG resources according to SSBs indicated by TCI states that are not activated.

[0081] As one embodiment, the above method rationalizes the conditions for random access free switching.

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

[0083] As one embodiment, the above method reduces random access free switching failures.

[0084] According to an aspect of the present application, the activated TCI states are TCI states activated by any of a Candidate Cell TCI States Activation / Deactivation MAC CE, the first MAC CE, or RRC signaling.

[0085] According to an aspect of the present application, the activated TCI states are TCI states activated by a Candidate Cell TCI States Activation / Deactivation MAC CE.

[0086] According to an aspect of the present application, the activated TCI states are TCI states activated by any of a Candidate Cell TCI States Activation / Deactivation MAC CE or RRC signaling.

[0087] According to an aspect of the present application, whether the first switching procedure is random access free depends on whether there is at least one activated TCI state among the at least one TCI state and the activated TCI state corresponds to a SSB associated with at least one CG resource.

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

[0089] According to an aspect of the present application, the first cell is configured with two TAGs; whether the first handover procedure is random access free 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 activated TCI state is associated with at least one CG resource.

[0090] As an embodiment, if 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 activated TCI state is associated with at least one CG resource, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

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

[0092] sending a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell; sending a first MAC CE, the first MAC CE indicating the identity of the first cell;

[0093] wherein, in response to the first MAC CE being received, a receiver of the first RRC message performs a first handover procedure; wherein the first MAC CE indicates a first TA of the first cell, or a first TA of the first cell is measured by the receiver of the first RRC message; whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first handover procedure is random access free depending on whether there is at least one activated TCI state in the at least one TCI state comprises: if there is at least one activated TCI state in the at least one TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

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

[0095] a first receiver, receiving a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell; receiving a first MAC CE, the first MAC CE indicating the identity of the first cell;

[0096] The first processor performs a first handover procedure as a response to the reception of the first MAC CE; wherein the first MAC CE indicates a first TA of the first cell, or a first TA of the first cell is measured to by the first processor.

[0097] wherein whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state comprises: if there is at least one activated TCI state in the at least one TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

[0098] A second node for wireless communication is disclosed, comprising:

[0099] The second transmitter transmits a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell; and transmits a first MAC CE, the first MAC CE indicating the identity of the first cell.

[0100] wherein a receiver of the first RRC message performs a first handover procedure as a response to the reception of the first MAC CE; wherein the first MAC CE indicates a first TA of the first cell, or a first TA of the first cell is measured to by the receiver of the first RRC message; whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state comprises: if there is at least one activated TCI state in the at least one TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free. BRIEF DESCRIPTION OF DRAWINGS

[0101] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in connection with the following accompanying drawings:

[0102] Figure 1A A flowchart in accordance with one embodiment of the present application is shown;

[0103] Figure 1B A flowchart in accordance with one embodiment of the present application is shown;

[0104] Figure 2A diagram illustrating a network architecture is shown in accordance with an embodiment of the application;

[0105] Figure 3 A diagram illustrating an embodiment of a wireless protocol architecture of a user plane and a control plane is shown in accordance with an embodiment of the application;

[0106] Figure 4 A diagram illustrating a first communication device and a second communication device is shown in accordance with an embodiment of the application;

[0107] Figure 5 A flow diagram illustrating wireless signal transmission in accordance with an embodiment of the application is shown;

[0108] Figure 6 A flow diagram illustrating wireless signal transmission in accordance with another embodiment of the application is shown;

[0109] Figure 7 A flow diagram illustrating UE-based TA measurement in accordance with an embodiment of the application is shown;

[0110] Figure 8 A diagram illustrating starting or restarting a first timer is shown in accordance with an embodiment of the application;

[0111] Figure 9 A flow diagram illustrating a second RRC message in accordance with an embodiment of the application is shown;

[0112] Figure 10 A block diagram illustrating an architecture of a processing device in a first node is shown in accordance with an embodiment of the application;

[0113] Figure 11 A block diagram illustrating an architecture of a processing device in a second node is shown in accordance with an embodiment of the application;

[0114] Figure 12 A diagram illustrating whether a first handover procedure is random access free depending on whether a second timer is running in accordance with an embodiment of the application. DETAILED DESCRIPTION

[0115] The technical solutions of the present application will be further described below in conjunction with the drawings, it should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0116] Example 1A

[0117] Embodiment 1A illustrates a flow diagram in accordance with an embodiment of the application, as shown in FIG. 1A. FIG. 1A shows a flow diagram illustrating wireless signal transmission in accordance with an embodiment of the application. Figure 1A Figure 1A ​In the figure, each block represents a step, and it is particularly emphasized that the order of the blocks in the figure does not represent the time sequence between the steps represented.

[0118] In embodiment 1, the first node in the present application receives, in step 101, a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; receives, in step 102, a first MAC CE, the first MAC CE indicating the identity of the first cell; performs, in step 103, a first handover procedure in response to the first MAC CE being received; wherein whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured comprises: if at least one resource group is configured for the first cell and the first TA of the first cell is measured, the first handover procedure is random access free; if at least two resource groups are configured for the first cell, the first handover procedure is not random access free.

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

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

[0121] As an embodiment, the first RRC message is transmitted by 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 one embodiment, the first RRC message belongs to an RRCReconfiguration message.

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

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

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

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

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

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

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

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

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

[0135] As one embodiment, the first RRC message is received at a serving cell of the first node.

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

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

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

[0139] As one embodiment, the first cell is configured to a first serving cell.

[0140] As one embodiment, the first cell is configured to a cell group to which the first serving cell belongs.

[0141] As one embodiment, the first cell is a candidate of the first serving cell.

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

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

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

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

[0146] As one embodiment, the first serving cell is a source cell of the first handover procedure.

[0147] As one embodiment, the configuration information of the first cell comprises T304.

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

[0149] As one embodiment, the configuration information of the first cell comprises a cell common physical layer configuration of the first cell.

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

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

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

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

[0154] As one embodiment, the identity of the first cell is a PCI (Physical Cell Identifier) of the first cell.

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

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

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

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

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

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

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

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

[0163] As one embodiment, the first TCI state being activated means that the first TCI state is activated when the first handover procedure is performed.

[0164] As one embodiment, the first TCI state being activated means that the first TCI state is activated at least for a period of time after the first MAC CE is received.

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

[0166] As one embodiment, the first TCI state being activated means that the first TCI state is one of the activated TCI states.

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

[0168] As one 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 one embodiment, the first TCI state is one of the activated TCI states.

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

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

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

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

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

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

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

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

[0178] As one sub-example of the above, the first MAC CE does not indicate any TCI state.

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

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

[0181] As one sub-example of the above, the one MAC CE is a Candidate Cell TCI States Activation / Deactivation MAC CE.

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

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

[0184] As one example, the first TCI state is any activated TCI state of the first cell.

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

[0186] As one example, 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 one example, 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 one example, 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 one example, 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 one 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 one tag-Id-ptr.

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

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

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

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

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

[0196] As one embodiment, one field in the first MAC CE indicates the identity of the first cell.

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

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

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

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

[0201] As one embodiment, the first MAC CE comprises one UL TCI state ID field, the one TCI state ID field indicating the first TCI state.

[0202] As one embodiment, the first MAC CE comprises one TCI state ID field and one UL TCI state ID field, either one of the one TCI state ID field and the one UL TCI state ID field indicating the first TCI state.

[0203] As one embodiment, the first MAC CE triggers the first switching procedure.

[0204] As one embodiment, in response to the first MAC CE being received, the first switching procedure being triggered and the identity of the first cell are indicated to a higher layer.

[0205] As one embodiment, the first switching procedure is a switching procedure.

[0206] As one embodiment, the first switching procedure is a LTM cell switch procedure.

[0207] As one embodiment, the first switching procedure comprises applying at least part of the configuration information of the first cell.

[0208] As one embodiment, the first switching procedure comprises a Reconfiguration with sync procedure.

[0209] As one embodiment, the first switching procedure comprises a MAC reset.

[0210] As one embodiment, in the first switching procedure, a MAC reset is requested to be performed by a higher layer.

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

[0212] As one embodiment, whether the first handover procedure is random access free depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured is referring to whether the first handover procedure is random access free is related to the number of resource groups configured for the first cell and whether the first TA of the first cell is measured.

[0213] As one embodiment, whether the first handover procedure is random access free depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured is referring to the first node determines whether the first handover procedure is random access free according to at least the number of resource groups configured for the first cell and whether the first TA of the first cell is measured.

[0214] As one embodiment, in the first handover procedure, it is determined whether the first handover procedure is random access free; whether the first handover procedure is random access free depends on the number of resource groups of the first cell and whether the first TA of the first cell is measured.

[0215] As one embodiment, it is determined whether the first handover procedure is random access free before the MAC reset.

[0216] As one embodiment, it is determined whether the first handover procedure is random access free after the MAC reset.

[0217] As one 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 handover procedure is random access free; if at least the first cell is configured with at least two resource groups, it is determined that the first handover procedure is not random access free.

[0218] As one embodiment, the determination that the first handover procedure is random access free is referring to considering that the first handover procedure is random access free.

[0219] As one embodiment, the determination that the first handover procedure is random access free is referring to considering that the random access free first handover procedure is ongoing.

[0220] As one embodiment, the first TA is processed in conjunction with the determination that the first handover procedure is random access free.

[0221] As one embodiment, the first TA is processed before the determination that the first handover procedure is random access free.

[0222] As one embodiment, the first TA is processed after the determination that the first handover procedure is random access free.

[0223] As an embodiment, the determining that the first handover procedure is not random access free refers to triggering random access in the first handover procedure.

[0224] As an embodiment, the determining that the first handover procedure is not random access free refers to initiating random access in the first handover procedure.

[0225] As an embodiment, the determining that the first handover procedure is not random access free refers to performing random access in the first handover procedure.

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

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

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

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

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

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

[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 one 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 one 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 one 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 one 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 one embodiment, the first TA of the first cell is a TA of the first cell measured by the first node.

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

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

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

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

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

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

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

[0249] As one embodiment, if the first cell is configured with at least two resource sets, the first TA is a TA of one resource set of the at least two resource sets.

[0250] As one embodiment, if the first cell is configured with at least two resource sets, the first TA is an index value TA for control timing adjustment amount that a MAC entity has to apply for one resource set of the at least two resource sets configured for the first cell.

[0251] As one embodiment, the at least two resource sets are two resource sets.

[0252] As one embodiment, the at least two resource sets are more than two resource sets.

[0253] As one embodiment, the first TA of the first cell being measured to comprises the first TA of the first cell being successfully measured to.

[0254] As one embodiment, the first TA of the first cell being measured to comprises the first TA of the first cell being measured to by performing UE-based TA measurement.

[0255] As one embodiment, the first TA of the first cell being measured to comprises a radio signal of the first serving cell being measured to and a radio signal of the first cell being measured to.

[0256] As one embodiment, the first TA of the first cell being measured to comprises a downlink frame timing of the first serving cell being measured to and a downlink frame timing of the first cell being measured to.

[0257] As one embodiment, the first TA of the first cell being measured to comprises a reception timing of the first radio signal of the first cell and a reception timing of the second radio signal of the first serving cell being measured to.

[0258] As one embodiment, the first TA of the first cell being measured to comprises a difference of a reception timing of the first radio signal of the first cell and a reception timing of the second radio signal of the first serving cell being measured to.

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

[0260] As one embodiment, the first TA of the first cell is measured to include that a TAT of the first cell is running.

[0261] As one embodiment, whether the first handover procedure is random access free depends on a number of resource groups the first cell is configured with and whether the first TA of the first cell is measured to include that: if the first TA of the first cell is not measured to, the first handover procedure is not random access free.

[0262] As one embodiment, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" includes that: if the first cell is configured with at least two resource groups, whether the first handover procedure is random access free depends on whether at least the first TA of the first cell is measured to.

[0263] As one embodiment, when the first cell is configured with one resource group, the first handover procedure is random access free if the first TA of the first cell is measured to; otherwise, the first handover procedure is not random access free.

[0264] As one embodiment, when the first cell is configured with one resource group, the first handover procedure is random access free if the first TA of the first cell is measured to; otherwise, the first handover procedure is not random access free.

[0265] As one embodiment, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" includes that: if the first cell is configured with at least two resource groups, whether the first handover procedure is random access free depends on whether at least the first TA of the first cell is measured to.

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

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

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

[0269] As one embodiment, if the first handover procedure is random access free, random access is not triggered in the first handover procedure.

[0270] As one embodiment, if the first handover procedure is random access free, random access is not directly triggered in the first handover procedure.

[0271] As one embodiment, if the first handover procedure is random access free, transmitting on the first configured grant is performed; random access is not triggered before transmitting on the first configured grant.

[0272] As one embodiment, the transmitting on the first configured grant comprises transmitting a DCCH message on the first configured grant.

[0273] As one embodiment, the transmitting on the first configured grant refers to transmitting a DCCH message on the first configured grant.

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

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

[0276] As one embodiment, if transmitting on the first configured grant fails, random access is triggered.

[0277] As one embodiment, if transmitting on the first configured grant fails, fallback to random access is performed.

[0278] As one embodiment, if transmitting on the first configured grant fails, the first handover procedure fails.

[0279] As one embodiment, the first configuration grant is released in the first handover procedure if the first handover procedure is not random access free.

[0280] As one embodiment, random access is triggered in the first handover procedure if the first handover procedure is not random access free.

[0281] As one embodiment, random access is performed in the first handover procedure if the first handover procedure is not random access free.

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

[0283] As one embodiment, the first configuration grant is of configured grant Type 1.

[0284] As one embodiment, the first configuration grant is for LTM.

[0285] As one embodiment, the first configuration grant is configured to the first cell.

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

[0287] As one embodiment, the first TCI state is applied at a specified symbol after the first MAC CE is received if the first handover procedure is random access free.

[0288] As one embodiment, the location of the specified symbol is predefined.

[0289] As one embodiment, the location of the specified symbol is preconfigured.

[0290] As one embodiment, the first TCI state is applied after a random access procedure is completed after the first MAC CE is received if the first handover procedure is not random access free.

[0291] As one embodiment, the applying the first TCI state means adopting the first TCI state.

[0292] As one embodiment, the applying the first TCI state means performing uplink transmission according to the first TCI state.

[0293] As one embodiment, the applying the first TCI state means performing at least one of uplink transmission or downlink reception according to the first TCI state.

[0294] 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 handover procedure is random access free" 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, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free; the resource group associated with the first TCI state is one of the at least two resource groups.

[0295] As an embodiment, the "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 one resource group.

[0297] As an embodiment, the first cell is configured 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 "the first TA of the first cell is measured" means: the first TA of the first cell is acquired.

[0301] As an embodiment, the "the first TA of the first cell is measured" means: the first TA of the first cell is available.

[0302] As an embodiment, the "the first TA of the first cell is measured" means: 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 UE implementation.

[0304] As an embodiment, the "the first TA of the first cell is measured" is irrelevant to whether a timeAlignmentTimer corresponding to a TAG configured by the first cell is running.

[0305] As one embodiment, the first TA of the first cell is measured to relate to whether a timeAlignmentTimer corresponding to a TAG configured for the first cell is running; the first cell is configured with one TAG.

[0306] As one embodiment, the first TA of the first cell is measured to relate to whether a timeAlignmentTimer corresponding to a TAG configured for the first cell is running; the first cell is configured with at least two TAGs.

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

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

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

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

[0311] As one embodiment, the measurement of the first wireless signal for the first cell and the measurement of the second wireless signal for the first serving cell are used to determine a difference in reception timing of the first wireless signal of the first cell and the second wireless signal of the first serving cell.

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

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

[0314] As one embodiment, the first TA of the first cell is equal to (a first reference TA + a first offset + a difference in reception timing of the first wireless signal of the first cell and the second wireless signal of the first serving cell).

[0315] As an embodiment, the first TA of the first cell is equal to (the first reference TA + the first offset + 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 serving cell + 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).

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

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

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

[0319] As an embodiment, the first offset comprises 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 comprises 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 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 is pre-configured.

[0323] As an embodiment, the 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 is measured by the first node.

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

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

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

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

[0328] As one embodiment, the second wireless signal of the first serving cell is one wireless signal of the first serving cell.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0343] As one embodiment, the first node has a UE capability to support at least two resource groups.

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

[0345] As one embodiment, the first node supports R18 and does not support a protocol version after R18.

[0346] As one embodiment, the first node supports R18 and supports a protocol version after R18.

[0347] As one embodiment, the protocol version after R18 includes R19.

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

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

[0350] As one embodiment, “if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free” is independent of the protocol version supported by the first node.

[0351] As one embodiment, “if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free” only if the first node supports at least R18.

[0352] As one embodiment, “if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free” only if the first node supports a protocol version after R18.

[0353] Example 1B

[0354] Embodiment 1B illustrates a flowchart according to one embodiment of the present application, as shown in FIG. 1B. FIG. 1B illustrates a flowchart according to one embodiment of the present application, as shown in FIG. 1B. Figure 1B FIG. 1B illustrates a flowchart according to one embodiment of the present application, as shown in FIG. 1B. Figure 1BEach block in the flowchart represents one or more steps in the step of the described implementation (s). Note that the steps represented by the various blocks in the flowchart can be carried out in any order unless indicated otherwise, and the order in which the steps are carried out can not necessarily correspond to the order of the blocks in the flowchart.

[0355] In embodiment 1B, the first node in the present application receives, in step 101B, a first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell; receives, in step 102B, a first MAC CE indicating the identity of the first cell; performs, in step 103B, a first handover procedure in response to the first MAC CE being received; wherein the first MAC CE indicates a first TA of the first cell, or a first TA of the first cell is measured; wherein whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state; whether the first handover procedure is random access free depends on whether there is at least one activated TCI state in the at least one TCI state comprises: if there is at least one activated TCI state in the at least one TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

[0356] As an embodiment, the first handover procedure is random access free; there is one activated TCI state in the at least one TCI state.

[0357] As an embodiment, a SSB associated CG resource corresponding to the one activated TCI state is selected.

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

[0359] As an embodiment, a SSB associated CG resource corresponding to any one of the multiple activated TCI states is selected.

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

[0361] As an embodiment, a SSB associated CG resource corresponding to a RSRP highest activated TCI state of the multiple activated TCI states is selected.

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

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

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

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

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

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

[0368] As one embodiment, the above method is beneficial to improve the performance of random access free switching.

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

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

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

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

[0373] As one 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 a TAG corresponding to the first TA of the first cell; the activated TCI state is a TCI state activated by at least one of a Candidate Cell TCI States Activation / Deactivation MAC CE or the first MAC CE or RRC signaling.

[0375] As an embodiment, in the prior art, both TA and TCI state are indicated by the first MAC CE, and the UE determines the TAG corresponding to 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 one of a Candidate Cell TCI States 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 indicating the TAG corresponding to the first TA of the first cell through the first MAC CE.

[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 indicating and activating a TCI state. On the one hand, if a TCI state has been activated by a Candidate Cell TCI States Activation / Deactivation MAC CE, there is signaling redundancy when the first MAC CE indicates and activates this 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 the random access free handover more flexible.

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

[0381] As an embodiment, the above method reduces the 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, one 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; one 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 field indicating the activated TCI state is RRC configured.

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

[0387] As an embodiment, if RRC configures that the first MAC CE can include a field indicating the activated TCI state, one 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 that the first MAC CE can include a field indicating the activated TCI state, one 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; one 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 that the first MAC CE can include a field indicating the activated TCI state, one field in the first MAC CE indicates whether the first MAC CE includes a field indicating the activated TCI state; if RRC configures that the first MAC CE does not include a field indicating the activated TCI state, one 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 UL TCI State.

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

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

[0395] As an embodiment, the above method avoids that the selected activated TCI state indicated SSB is not associated with CG resource.

[0396] As an embodiment, if there is at least one activated TCI state in the at least one TCI state and the activated TCI state corresponds to an SSB associated with at least one CG resource, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

[0397] As an embodiment, the CG resource is a CG resource of the first cell for LTM.

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

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

[0400] As an embodiment, the first cell is configured with two TAGs; whether the first handover procedure is random access free 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 a TA of any TAG of the first cell.

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

[0403] As an embodiment, if 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, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

[0404] As an embodiment, for the sake of brevity of the specification, features repeated in the present embodiment and other embodiments are not described here. Features in other embodiments can be applied to the present embodiment without conflict. Features in the embodiments of the present application and other embodiments can be arbitrarily combined with each other without conflict.

[0405] Example 2

[0406] Example 2 illustrates a schematic diagram of a network architecture according to an embodiment of this application, as shown in the attached diagram. Figure 2 As shown. (Attached) Figure 2A network architecture 200 is illustrated. 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 for future continued evolution of 3GPP; the network architecture 200 can be referred to as a 5GS (5G System) / EPS (Evolved Packet System), or the network architecture 200 can be referred to as a 6GS (6G System); the network architecture 200 includes a UE (User Equipment) 201, a RAN (Radio Access Network) 202, a core network 210, a HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and at least one of an Internet service 230. The network architecture 200 can interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As illustrated, the network architecture 200 provides packet-switched services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application are amenable to use with networked systems including, but not limited to, wireless communication networks and other cellular networks that provide circuit-switched 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 the other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. The node 203 can 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 (Transmit Receive Point), or some other suitable terminology. The core network 210 is a 5GC (5G Core Network) / EPC (Evolved Packet Core), or the core network 210 is a 6GC; the node 203 provides access to the core network 210 for the UE 201. Examples of UEs 201 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a non-tower based station communication, a satellite mobile communication, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a drone, a flying vehicle, a narrowband internet of things device, a machine type communication device, a land vehicle, an automobile, a wearable device, or any other similar functional device.A person of ordinary skill in the art can also refer to the UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The node 203 is connected to the core network 210 through an S1 / NG interface. The core network 210 includes a MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, a S-GW (Service Gateway) / UPF (User Plane Function) 212, and a P-GW (Packet Data Network Gateway) / UPF 213. The MME / AMF / SMF 211 is a control node that handles signaling between the UE 201 and the core network 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocal) packets are transferred through the S-GW / UPF 212, which is connected to the P-GW / UPF 213. The P-GW provides UE IP address allocation and other functions. The P-GW / UPF 213 is connected to an Internet service 230. The Internet service 230 includes operator corresponding Internet protocol services, and can specifically include the Internet, an intranet, an IMS (IP Multimedia Subsystem), and a packet exchange streaming service.

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

[0408] As an embodiment, the UE 201 is a base station (BS).

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

[0410] As an embodiment, the UE 201 is a gateway device.

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

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

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

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

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

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

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

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

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

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

[0421] As an example, the UE 201 is connected to both the node 203 and the node 204.

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

[0423] As an example, the node 203 and the node 204 are connected through non-ideal backhaul.

[0424] As an example, the node 203 and the node 204 provide wireless resources for the UE 201 simultaneously.

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

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

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

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

[0429] As an example, 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 equipment, and the node 204 is a base station equipment.

[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 equipment, the node 203 is a base station equipment, and the node 204 is a base station equipment.

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

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

[0435] As an embodiment, the user equipment supports 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 equipment is a mobile phone or a tablet.

[0447] As one embodiment, the user equipment is an aerial vehicle.

[0448] As one embodiment, the user equipment is an Internet of Things device, which is an Internet of Things terminal or a vehicular terminal or a terminal of a ship or an industrial Internet of Things.

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

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

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

[0452] As one embodiment, the base station equipment supports transmission in a terrestrial network.

[0453] As one embodiment, the base station equipment 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 femto cell (Femtocell); the base station equipment is a 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 one embodiment, the base station equipment comprises at least one of a CU (Centralized Unit) or a DU (Distributed Unit) or a TRP (Transmitter Receiver Point).

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

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

[0457] As one embodiment, the base station equipment is a gateway equipment.

[0458] As one embodiment, the base station equipment is an IAB node, which 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 one embodiment, the relay device is a relay, which is an L3 relay or an L2 relay or an LI relay.

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

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

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

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

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

[0465] Example 3

[0466] Figure 3 shows a schematic diagram of an embodiment of a radio protocol architecture for the user plane 350 and control plane 300 according to an embodiment of the application, as shown in Figure 1. Figure 3 Figure 3 Figure 3 shows a schematic diagram of an embodiment of a radio protocol architecture for the user plane 350 and control plane 300 according to an embodiment of the application, as shown in Figure 1. Figure 3 ​The radio protocol architecture for controlling plane 300 is shown with 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 the PHY 301 herein. Layer 2 (L2 layer) 305 is above the PHY 301 and includes a MAC (Medium Access Control) sublayer 302, a 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 ciphering the packet data and header compression. The RLC sublayer 303 provides segmentation and reassembly of upper layer packet data, retransmission of lost packet data, and reordering of packet data to compensate for out-of-sequence 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 the various radio resources (e.g., resource blocks) in one cell. The MAC sublayer 302 is also responsible for HARQ operation. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the controlling plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring lower layers using RRC signaling. The radio protocol architecture of the user plane 350 includes Layer 1 (L1 layer) and Layer 2 (L2 layer), which are generally the same as the corresponding layers and sublayers in the controlling 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 packet data to reduce radio transmission overhead. The SDAP (Service Data Adaptation Protocol) sublayer 356 is also included in the L2 layer 355 in the user plane 350, which is responsible for mapping between QoS flows and data radio bearers (DRBs) to support the diversity of services.

[0467] As one embodiment, the radio protocol architecture in the first node Figure 3 in the present application.

[0468] As one embodiment, the radio protocol architecture in the first node Figure 3The wireless protocol architecture in the first communication device 450 is applicable to the second node in the application.

[0469] As one embodiment, the first RRC message in the application is generated at the RRC 306.

[0470] As one embodiment, the first MAC CE in the application is generated at the MAC 302 or the MAC 352.

[0471] As one embodiment, the at least one radio signal of the first cell in the application is generated at the PHY 301 or the PHY 351.

[0472] Example 4

[0473] Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to the application, as shown in Fig. 4. Figure 4 The first communication device 450 and the second communication device 410 are in communication with each other over an access network. Figure 4 The first communication device 450 and the second communication device 410 are in communication with each other over 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 multiple antenna transmit processor 457, a multiple 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 multiple antenna receive processor 472, a multiple antenna transmit processor 471, a transmitter / receiver 418, and an antenna 420.

[0476] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, upper layer packets from the core network are provided to the controller / processor 475. The controller / processor 475 implements functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocations for 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 multiple antenna transmit processor 471 implement various signal processing functions for the LI layer (i.e., physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, and mapping of coded bits to modulation symbols 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 multiple antenna transmit processor 471 performs digital spatial pre-coding of the coded and modulated symbols, including codebook-based and non-codebook-based pre-coding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps to each spatial stream to the subcarriers, multiplexes the stream with reference signals (e.g., pilot) in the time and / or frequency domain, and then performs an inverse fast Fourier transform (IFFT) to generate a time-domain multicarrier symbol stream for the physical channel. The multiple antenna transmit processor 471 then performs transmit analog pre-coding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multiple antenna transmit processor 471 into a radio frequency stream, and then provides the radio frequency stream to the corresponding antenna 420.

[0477] In transmissions 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 respective antenna 452. Each receiver 454 recovers information modulated onto an RF carrier and provides the recovered information at baseband as a stream of symbols to a receive processor 456. The receive processor 456 and a multiple access receiver processor 458 implement various signal processing functions of the Ll layer. The multiple access receiver processor 458 performs receive analog precoding / beamforming operations on the baseband multiple access symbol streams from the receivers 454. The receive processor 456 converts the baseband multiple access symbol streams from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signals and the reference signals are demultiplexed from the received symbol streams, with the reference signals to be used for channel estimation and the data signals to be recovered after multiple access detection in the multiple access receiver processor 458 for any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered by the receive processor 456 and used to generate soft decisions. The receive processor 456 then decodes and de-interleaves 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 a controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 can be associated with a memory 460 that stores program codes and data. The memory 460 can be referred to as a computer-readable medium. In transmissions from the second communication device 410 to the first communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover 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 can also be provided to the 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 a controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmit 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, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations, implements L2 layer functionality for the user plane and control plane. The controller / processor 459 is also responsible for error detection, retransmission of lost packets, and signaling to the second communication device 410. A transmit processor 468 performs modulation mapping, channel coding processing, and a multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, and then the transmit processor 468 modulates the resulting spatial streams into multi-carrier / single-carrier symbol streams, which are then provided to different antennas 452 via transmitters 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 signal, and then provides the radio frequency signal to the antenna 452.

[0479] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the receive functions 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 respective antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to a multi-antenna receive processor 472 and a receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 collectively implement the functionality of the L1 layer. A controller / processor 475 implements the functionality of the L2 layer. The controller / processor 475 can be associated with a memory 476 that stores 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 demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the UE 450. Upper layer data packets from the controller / processor 475 can be provided to a core network.

[0480] As one embodiment, the first communication device 450 corresponds to a first node in the present application; the first communication device 450 comprises at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the first communication device 450 at least to: receive a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; receive a first MAC CE, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, perform a first handover procedure; wherein whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depending on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured comprises: if at least the first cell is configured one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; if at least the first cell is configured at least two resource groups, the first handover procedure is not random access free.

[0481] As one embodiment, the first communication device 450 corresponds to a first node in the present application; the first communication device 450 comprises a memory storing a computer readable program of instructions which, when executed by at least one processor, causes actions comprising: receiving a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; receiving a first MAC CE, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, performing a first handover procedure; wherein whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depending on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured comprises: if at least the first cell is configured one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; if at least the first cell is configured at least two resource groups, the first handover procedure is not random access free.

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

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

[0484] As one embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is configured to receive the first RRC message.

[0485] As one embodiment, at least one of the antenna 420, the transmitter 418, the transmitting processor 416, and the controller / processor 475 is configured to send the first RRC message.

[0486] As one embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is configured to receive the first MAC CE.

[0487] As one embodiment, at least one of the antenna 420, the transmitter 418, the transmitting processor 416, and the controller / processor 475 is configured to send the first MAC CE.

[0488] As one embodiment, at least one of the antenna 452, the transmitter 454, the transmitting processor 468, and the controller / processor 459 is configured 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 receive processor 470, the controller / processor 475 is configured 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, the controller / processor 459 is configured to transmit a first wireless signal.

[0491] As an embodiment, at least one of the antenna 420, the receiver 418, the receive processor 470, the controller / processor 475 is configured 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 FIG. 5. Figure 5 It is particularly noted that the sequence in this example does not limit the sequence of signal transmission and implementation in the present application.

[0500] For example, the first communication device 450 can be a user equipment, a base station device, or a relay device. First node U01In step S5101, a first RRC message is received, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being 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 identity of the first cell; in step S5105, in response to the first MAC CE being received, a first handover procedure is performed; in step S5106, it is determined whether the first cell is configured with one resource group; if the first cell is configured with one resource group, step S5107(a) is entered; otherwise, if the first cell is configured with at least two resource groups, step S5107(b) is entered; in 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 handover procedure is random access free; otherwise, random access is performed in the first handover procedure; in step S5107(b), it is determined whether the first TA of the first cell is measured and whether the first TA is a TA of a 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 a TA of a resource group associated with the first TCI state, the first handover procedure is random access free; otherwise, random access is performed in the first handover procedure.

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

[0502] For Third node N03 In step S5301, the at least one wireless signal is transmitted.

[0503] In Embodiment 5, whether the first handover procedure is random access free depends on the number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured includes: the first handover procedure is random access free if at least one resource group is configured for the first cell and the first TA of the first cell is measured; the first handover procedure is not random access free if at least two resource groups are configured for the first cell; the “the first handover procedure is not random access free if at least two resource groups are configured for the first cell” means: when at least two resource groups are configured for the first cell, if at least the first TA of the first cell is measured and the first TA is a TA of a resource group associated with the first TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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, the first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identity 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 one of the at least one TCI state; a first MAC CE is received, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, a first handover procedure is performed; wherein the first cell is configured one resource group; the first handover procedure is random access free if at least the first TA of the first cell is measured; otherwise, the first handover procedure is not random access free.

[0505] As an embodiment, a first RRC message is received, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being an activated one of the at least one TCI state; a first MAC CE is received, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, a first handover procedure is performed; wherein the first cell is configured with at least two resource groups; if at least a first TA of the first cell is measured and the first TA is a TA of a resource group associated with the first TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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 via a wireless connection.

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

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

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

[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 via a wireless connection.

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

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

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

[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 over a wireless interface.

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

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

[0519] As an embodiment, the third node N03 and the second node N02 are non-ideal backhaul.

[0520] As an embodiment, the third node N03 and the second node N02 are connected over 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 each 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 serving 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 non-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 one embodiment, the step S5105 belongs to the step S5104.

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

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

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

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

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

[0538] As one embodiment, the step S5102 is present.

[0539] As one embodiment, the step S5102 is not present.

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

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

[0542] As one embodiment, the measuring the first wireless signal includes measuring a reception timing of the first wireless signal.

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

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

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

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

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

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

[0549] As one embodiment, in the step S5103, the wireless signal of the first serving cell is measured.

[0550] As one embodiment, the measuring the second wireless signal comprises measuring a reception timing of the second wireless signal.

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

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

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

[0554] As one embodiment, the measuring the second wireless signal comprises measuring a reception quality of the second wireless signal.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0573] As an embodiment, 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 of the at least two resource groups configured for the first cell.

[0574] As an embodiment, whether the first handover procedure is random access free 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 that the first handover procedure is random access free if at least one resource group is configured for the first cell and the first TA of the first cell is measured, or if at least two resource groups are configured for the first cell 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; otherwise, the first handover procedure is not random access free.

[0575] As an embodiment, the above method introduces the condition that the first handover procedure is random access free for the first cell configuring at least two resource groups.

[0576] As an embodiment, whether the first handover procedure is random access free 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 that the first handover procedure is random access free if the TA of the resource group associated with the first TCI state is measured; otherwise, the first handover procedure is not random access free.

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

[0578] As an embodiment, when the first cell is configured with at least two resource groups, the first handover procedure is not random access free 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.

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

[0580] As one embodiment, the first RRC message comprises a first information block indicating at least one radio signal of the first cell; the first TA of the first cell is measured based on a measurement of a first radio signal of the first cell, the first radio signal being one of the at least one radio signal; the first cell is configured with one resource group.

[0581] As one embodiment, the first RRC message comprises a first information block indicating at least one radio signal of the first cell; the first TA of the first cell is measured based on a measurement of a first radio signal of the first cell, the first radio signal being one of the at least one radio 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 depending on the resource group associated with the first TCI state and the resource group associated with the first radio signal being the same.

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

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

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

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

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

[0587] As one 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 and the resource group associated with the first radio signal are the same.

[0588] As one sub-embodiment of the above embodiment, the first TA is not the TA of the resource group associated with the first TCI state if the resource group associated with the first TCI state and the resource group associated with the first radio signal are different.

[0589] As a sub-embodiment of the above-mentioned embodiment, the first TA is measured by measuring the first wireless signal of the first cell.

[0590] As a sub-embodiment of the above-mentioned 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-mentioned embodiment, the TA of the first cell is measured by measuring a downlink frame to which the first wireless signal of the first cell belongs.

[0592] As a sub-embodiment of the above-mentioned 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-mentioned 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 transmitted.

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

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

[0597] As an embodiment, the at least one wireless signal of the first cell is considered to be transmitted 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 comprises a first bitmap, each of the at least one wireless signal of the first cell is corresponding to a bit in the first bitmap which is set to 1.

[0603] As an embodiment, the first information block comprises a first bitmap, the at least one wireless signal of the first cell consists of wireless signals corresponding to all bits set to 1 in the first bitmap.

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

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

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

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

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

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

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

[0611] As an embodiment, any 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 a SSB.

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

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

[0615] As an embodiment, the first RRC message comprises 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 a measurement of a first wireless signal of the first cell, the first wireless signal being 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, the TA of the resource group associated with the first TCI state being dependent on the resource group associated with the first wireless signal being the same as the resource group associated with the first TCI state; the first RRC message comprises a second information block, the second information block indicating the resource group associated with the first wireless signal.

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

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

[0618] As an embodiment, the first RRC message comprises a second information block, the first cell being configured with at least two resource groups.

[0619] As an embodiment, the first RRC message comprises a second information block if the first cell is configured with at least two resource groups; the first RRC message does not comprise a second information block if the first cell is configured with one resource group.

[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 the resource group associated with each wireless signal of the at least one wireless signal.

[0624] As an embodiment, the second information block indicates the 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 the resource group associated with the first wireless signal.

[0626] As an embodiment, the second information block indicates, for a list of wireless signals, an index of the resource group to which the first wireless signal is associated, the list of wireless signals including one or more of the at least one wireless signal.

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

[0628] As an embodiment, the second bitmap and the first bitmap have the same size.

[0629] As an embodiment, the second bitmap and the first bitmap are one-to-one corresponding.

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

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

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

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

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

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

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

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

[0638] Example 6

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

[0640] First node U01 In step S6101, a first RRC message is received, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being 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, the first MAC CE indicating the identity of the first cell; in step S6105, in response to the first MAC CE being received, a first handover procedure is performed; in step S6106, it is determined whether the first cell is configured with one resource group and the first TA of the first cell is measured; if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; otherwise, random access is performed in the first handover procedure.

[0641] 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] Third node N03 In step S6301, the at least one wireless signal is sent.

[0643] ​​​​In Embodiment 6, whether the first handover procedure is random access free 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 handover procedure is random access free depends on the number of resource groups configured for the first cell and whether the first TA of the first cell is measured comprises: if at least the first cell is configured one resource group and the first TA of the first cell is measured, the first handover procedure is random access free; if at least the first cell is configured at least two resource groups, the first handover procedure is not random access free; the “if at least the first cell is configured at least two resource groups, the first handover procedure is not random access free” means: as long as the first cell is configured at least two resource groups, the first handover procedure is not random access free.

[0644] As an embodiment, a first RRC message is received, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being an activated one of the at least one TCI state; a first MAC CE is received, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, a first handover procedure is performed; wherein the first cell is configured one resource group; if at least the first TA of the first cell is measured, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free.

[0645] As an embodiment, a first RRC message is received, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being an activated one of the at least one TCI state; a first MAC CE is received, the first MAC CE indicating the identity of the first cell; in response to the first MAC CE being received, a first handover procedure is performed; wherein the first cell is configured at least two resource groups; the first handover procedure is not random access free.

[0646] As an embodiment, the first node U01, the second node N02, the third node N03 refer to Embodiment 5, which will not be repeated here.

[0647] As an embodiment, the steps S6101 to S6105 refer to Embodiment 5, which will not be repeated here.

[0648] As one embodiment, the step S6201 to the step S6203 refer to Embodiment 5, which will not be repeated here.

[0649] As one embodiment, the step S6301 refers to Embodiment 5, which will not be repeated here.

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

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

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

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

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

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

[0656] As one embodiment, the UE-based TA measurement for the first cell is configured only if the first cell is configured with one resource set.

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

[0658] As one embodiment, if the first cell is configured with one resource set, the UE-based TA measurement for the first cell is performed 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; otherwise, the UE-based TA measurement for the first cell is not performed.

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

[0660] As one embodiment, the first node U01 does not support UE-based TA measurement for the first cell.

[0661] As one embodiment, the first node U01 does not support UE-based TA measurement for the first cell.

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

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

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

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

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

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

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

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

[0670] Example 7

[0671] Embodiment 7 illustrates a flowchart of UE-based TA measurement according to one embodiment of the present application, as shown in FIG. 7. In FIG. 7, the third node N03 includes the first sub-node N031 and the second sub-node N032; it is particularly pointed out that the sequence in this example does not limit the sequence of signal transmission and implementation in the present application. Figure 7 Figure 7 In step S7101, UE-based TA measurement is performed for the resource group associated with the first wireless signal; in step S7102, UE-based TA measurement is performed for the resource group associated with the first wireless signal among the two resource groups;

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

[0673] First sub-node N031 In step S73101, the at least the first wireless signal among the at least one wireless signal is transmitted.

[0674] For the first wireless signal, in step S73101, the at least the first wireless signal among the at least one wireless signal is transmitted. Second sub-node N032 In step S73201, a wireless signal other than the at least the first wireless signal among the at least one wireless signal is transmitted.

[0675] ​​In Embodiment 7, the “if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free” 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 handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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, and 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 a measurement of a 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 depends on that the resource group associated with the first TCI state and the resource group associated with the first wireless signal are the same; 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 for the resource group associated with the first wireless signal depends on at least the first wireless signal; and the at least two resource groups are two resource groups.

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

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

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

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

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

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

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

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

[0687] As one embodiment, the step S7102 is present.

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

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

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

[0691] As one embodiment, the step S7102 is not present.

[0692] As one subembodiment of the above embodiment, at least one wireless signal of the first cell is measured, other than the at least the first wireless signal, which is not used for performing UE-based TA measurement.

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

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

[0695] As one subembodiment of the above embodiment, at least part of the wireless signals of the at least one wireless signal of the first cell are not used for UE-based TA measurement.

[0696] Example 8

[0697] Embodiment 8 illustrates a flowchart of starting or restarting the first timer according to one embodiment of the present application, as shown in FIG. 8. Figure 8 The first timer is started or restarted in step S8101.

[0698] For example, the first timer is started or restarted in step S8101. First node U01 In step S8101, the first TA of the first cell is measured; in step S8102, the first timer is started or restarted along with the measurement of the first TA of the first cell.

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

[0700] As one embodiment, whether the first handover procedure is random access free depends on the number of resource groups configured by the first cell and whether the first TA of the first cell is measured and whether the first timer is running.

[0701] As one embodiment, the “if at least the first cell is configured with one resource group and the first TA of the first cell is measured, the first handover procedure is random access free” means that if at least the first cell is configured with one resource group and the first TA of the first cell is measured and the first timer is running, the first handover procedure is random access free.

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

[0703] As one embodiment, the "the first handover procedure is random access free 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" means: the first handover procedure is random access free 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.

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

[0705] As one embodiment, the "the first handover procedure is random access free 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" means: the first handover procedure is random access free 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.

[0706] As one embodiment, the first handover procedure is random access free 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 when the first cell is configured with at least two resource groups; otherwise, the first handover procedure is not random access free.

[0707] As one embodiment, the "the first handover procedure is random access free 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" means: the first handover procedure is random access free 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.

[0708] As one embodiment, the first handover procedure is random access free 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; otherwise, the first handover procedure is not random access free.

[0709] As one embodiment, the first handover procedure is not random access free 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.

[0710] As one embodiment, the first TA of the first cell is measured includes that the first timer is running.

[0711] As one embodiment, the first TA of the first cell is measured only if the first timer is running.

[0712] As one embodiment, the first TA of the first cell is not measured if the first timer is not running.

[0713] As one embodiment, the first TA of the first cell is not measured 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.

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

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

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

[0717] As one embodiment, the measuring the first TA of the first cell comprises measuring a downlink reference signal time difference of 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 a TA of the first serving cell.

[0718] As one embodiment, the first timer is running in conjunction with the measuring the first TA of the first cell.

[0719] As one embodiment, the first timer is restarted in conjunction with the measuring the first TA of the first cell, if the first timer is running.

[0720] As one embodiment, the first timer is not running in conjunction with the measuring the first TA of the first cell.

[0721] As one embodiment, the first timer is started in conjunction with the measuring the first TA of the first cell, if the first timer is not running.

[0722] As one embodiment, the conjunction with the measuring the first TA of the first cell means when a downlink reference signal time difference of the first cell and the first serving cell is measured.

[0723] As one embodiment, the conjunction with the measuring the first TA of the first cell means when the first TA of the first cell is determined according to the downlink reference signal time difference and a TA of the first serving cell.

[0724] As one embodiment, the conjunction with the measuring the first TA of the first cell means when the first TA of the first cell is measured.

[0725] As one embodiment, the conjunction with the measuring the first TA of the first cell means when a reception timing of the first wireless signal of the first cell and a reception timing of the second wireless signal of the first serving cell are measured.

[0726] As one embodiment, the conjunction with the measuring the first TA of the first cell means when a difference of a reception timing of the first wireless signal of the first cell and a reception timing of the second wireless signal of the first serving cell is measured.

[0727] As one embodiment, the first node U01 measures the first TA of the first cell by performing a 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 a UE-based TA measurement for a 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 including that the first timer is running when the first MAC CE is received.

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

[0732] As an embodiment, the first timer expiry triggers measuring the first TA of the first cell.

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

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

[0735] As an embodiment, whether the first TA of the first cell is measured when the first timer expires is decided by UE.

[0736] As an embodiment, the first cell is configured with at least two resource groups, the first timer is associated with a 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 handover procedure is not random access free” means that 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 handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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 one resource group, 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 FIG. 9. Figure 9

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

[0741] For Third node N03, , in step S9301, sending the second RRC message;

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

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

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

[0745] As one embodiment, the second RRC message is a HandoverCommand message.

[0746] As one embodiment, the second RRC message is an RRCReconfiguration message.

[0747] As one embodiment, the second RRC message is a handoverCommandMessage field.

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

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

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

[0751] As one subembodiment of the above embodiment, the at least one information block includes at least one RRC field.

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

[0753] As one subembodiment of the above embodiment, the at least one information block is not the second information block. ​

[0754] As one 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 apparatus in a first node according to one embodiment of the present application; as shown in FIG. 10. In FIG. 10, the processing apparatus 1000 in the first node comprises a first receiver 1001, a first processor 1002. Figure 10 Figure 10 In FIG. 10, the first receiver 1001 receives a first RRC message, the first RRC message comprising configuration information of a first cell; wherein the first RRC message indicates an identity of the first cell and at least one TCI state of the first cell, the at least one TCI state comprising a first TCI state, the first TCI state being activated; receives a first MAC CE, the first MAC CE indicating the identity of the first cell.

[0757] The first processor 1002 performs a first handover procedure in response to the first MAC CE being received.

[0758]

[0759] In Embodiment 10, whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured; whether the first handover procedure is random access free depends on a number of resource groups configured for the first cell and whether a first TA of the first cell is measured comprises: if at least one resource group is configured for the first cell and the first TA of the first cell is measured, the first handover procedure is random access free; if at least two resource groups are configured for the first cell, the first handover procedure is not random access free.

[0760] As one embodiment, the “if at least two resource groups are configured for the first cell, the first handover procedure is not random access free” means: when at least two resource groups are configured for the first cell, if at least the first TA of the first cell is measured and the first TA is a TA of a resource group associated with the first TCI state, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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 comprises a first information block, the first information block indicating at least one radio signal of the first cell; the first TA of the first cell is measured based on a measurement of a first radio signal of the first cell, the first radio signal being one of the at least one radio signal; the first cell is configured with at least two resource groups; the first TA is of a resource group associated with the first TCI state, the first TA being dependent on the resource group associated with the first TCI state and the resource group associated with the first radio signal being the same.

[0762] As an embodiment, the first RRC message comprises a second information block, the second information block indicating a resource group associated with the first radio signal.

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

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

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

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

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

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

[0769] As an embodiment, the first receiver 1001 comprises at least one of the antennas 452 or the receivers 454 or the multiple antennas reception processor 458 or the reception processor 456 or the controller / processor 459 or the memory 460 or the data source 467 in the apparatus 400 in the attached cross Figure 4 tus 452 or the receivers 454 or the multiple antennas reception processor 458 or the reception processor 456 or the controller / processor 459 or the memory 460 or the data source 467 in the apparatus 400 in the attached cross

[0770] As one example, the first receiver 1001 includes at least one antenna 452 and a receiver 454 in the apparatus 1000 as generally shown in FIG. 4. Figure 4 As one example, the first receiver 1001 includes at least one antenna 452 and a receiver 454 in the apparatus 1000 as generally shown in FIG. 4.

[0771] As one example, the first transmitter includes 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 in the apparatus 1000 as generally shown in FIG. 4. Figure 4 As one example, the first transmitter includes 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 in the apparatus 1000 as generally shown in FIG. 4.

[0772] As one example, the first transmitter includes 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 in the apparatus 1000 as generally shown in FIG. 4. Figure 4 As one example, the first transmitter includes 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 in the apparatus 1000 as generally shown in FIG. 4.

[0773] Example 11

[0774] Embodiment 11 illustrates a structural block diagram of a processing apparatus in a second node according to an embodiment of the present application; as shown in FIG. 11. In FIG. 11, the processing apparatus 1100 in the second node includes a second transmitter 1101. Figure 11 As shown in FIG. 11, the second transmitter 1101 transmits a first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identity 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 activated; transmits a first MAC CE indicating the identity of the first cell. Figure 11 As shown in FIG. 11, the second transmitter 1101 transmits a first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identity 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 activated; transmits a first MAC CE indicating the identity of the first cell.

[0775] As shown in FIG. 11, the second transmitter 1101 transmits a first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identity 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 activated; transmits a first MAC CE indicating the identity of the first cell.

[0776] As shown in FIG. 11, the second transmitter 1101 transmits a first RRC message including configuration information of a first cell; wherein the first RRC message indicates an identity 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 activated; transmits a first MAC CE indicating the identity of the first cell.

[0777] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" 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, the first handover procedure is random access free; otherwise, the first handover procedure is not random access free; 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 comprises a first information block, the first information block indicating at least one radio signal of the first cell; the first TA of the first cell being measured is based on a measurement of a first radio signal for the first cell, the first radio signal being one of the at least one radio signal; the first cell is configured with at least two resource groups; the first TA being the TA of the resource group associated with the first TCI state depends on the resource group associated with the first TCI state and the resource group associated with the first radio signal being the same.

[0779] As an embodiment, the first RRC message comprises a second information block, the second information block indicating the resource group associated with the first radio signal.

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

[0781] As an embodiment, the "if at least the first cell is configured with at least two resource groups, the first handover procedure is not random access free" means: as long as the first cell is configured with at least two resource groups, the first handover procedure is not random access free.

[0782] As an embodiment, in response to the first TA of the first cell being measured, a receiver of the first RRC message starts or restarts a first timer; wherein the first TA of the first cell being measured comprises the first timer being running.

[0783] As an embodiment, the second transmitter 1101 comprises 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 in the apparatus 1100. Figure 4 As an embodiment, the second transmitter 1101 comprises 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 in the apparatus 1100.

[0784] As one embodiment, the second transmitter 1101 includes the appendix to this application. Figure 4 At least antenna 420 and transmitter 418 are included.

[0785] Example 12

[0786] Example 12 illustrates a schematic diagram showing whether the first handover process according to an embodiment of this application is free from random access depending on whether a second timer is running, as shown in the attached diagram. Figure 12 As shown.

[0787] In Example 12, whether the first handover process is free from random access depends on whether the second timer is 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 is measured based on the first TAG.

[0788] As one example, the second timer is the timeAlignmentTimer corresponding to the first TAG.

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

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

[0791] As an example, the first TA of the first cell being measured based on the first TAG means that the first TA of the first cell is measured based on the TA of the first TAG and the second radio signal of the first serving cell; the second radio signal of the first serving cell is configured to the first TAG.

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

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

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

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

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

[0797] As one 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 the first TCI state is associated with and the first timer is running and the second timer is running, the first switching procedure is random access free; otherwise, the first switching procedure is not random access free.

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

[0799] As one 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 the first TCI state is associated with and the first timer is running and the second timer is running, the first switching procedure is random access free; otherwise, the first switching procedure is not random access free.

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

[0801] As one embodiment, the "the first switching procedure is random access free 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" means: the first switching procedure is random access free 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.

[0802] As one embodiment, when the first cell is configured with at least two resource groups, the first switching procedure is random access free 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; otherwise, the first switching procedure is not random access free.

[0803] As one embodiment, the "the first switching procedure is random access free 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" means: the first switching procedure is random access free 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.

[0804] As one embodiment, when the first cell is configured with at least two resource groups, the first switching procedure is random access free 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; otherwise, the first switching procedure is not random access free.

[0805] As one embodiment, the first switching procedure is not random access free if the second timer is not running, regardless of whether a timeAlignmentTimer corresponding to one of the two TAGs other than the first TAG is running.

[0806] As one embodiment, the first switching procedure is random access free regardless of whether a timeAlignmentTimer corresponding to one of the two TAGs other than the first TAG is running.

[0807] As one embodiment, the first TA of the first cell being measured includes the second timer being running.

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

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

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

[0811] Those skilled in the art can understand that all or part of the steps in the foregoing method can be instructed by programs to related hardware, and the programs can be stored in a computer readable storage medium, such as a read-only memory, a hard disk, an optical disk or the like. Alternatively, all or part of the steps of the foregoing embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the foregoing embodiments 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 combination of software and hardware. The user equipment, terminal and UE in the present application include but are not limited to unmanned aerial vehicles, communication modules on unmanned aerial vehicles, remote control aircraft, aircraft, small aircraft, mobile phones, tablet computers, notebooks, vehicle-mounted communication devices, wireless sensors, network cards, Internet of Things terminals, RFID terminals, NB-IOT terminals, MTC (Machine Type Communication) terminals, eMTC (enhanced MTC) terminals, data cards, network cards, vehicle-mounted communication devices, low-cost mobile phones, low-cost tablet computers and other wireless communication devices. The base station or system device in the present application includes but is not limited to macro cellular base stations, micro cellular base stations, home base stations, relay base stations, gNB (NR NodeB) NR NodeB, TRP (Transmitter Receiver Point) and other wireless communication devices.

[0812] The above describes only the preferred embodiments 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, the first RRC message including configuration information of a 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 including a first TCI state, the first TCI state being an active TCI state among the at least one TCI states; and receives a first MAC CE, the first MAC CE indicating the identifier of the first cell. The first processor, in response to the receipt of the first MAC CE, executes the first handover process; Whether the first handover process is free from 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 handover process is free from 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 one resource group is configured in the first cell and the first TA of the first cell is measured, the first handover process is free from random access; if at least two resource groups are configured in the first cell, the first handover process is not free from random access.

2. The first node according to claim 1, characterized in that, The statement that the first handover process is not exempt from random access if at least the first cell is configured with at least two resource groups includes: the first handover process is not exempt from random access as long as the first cell is configured with at least two resource groups.

3. The first node according to any one of claims 1 or 2, characterized in that, include: The first processor, in response to the first TA being measured in the first cell, starts or restarts the first timer; Specifically, the first timer in the first cell is measured to be running, including the first timer.

4. The first node according to any one of claims 1 or 2, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

5. The first node according to claim 3, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

6. A method used in a first node of wireless communication, characterized in that, include: Receive a first RRC message, the first RRC message including configuration information of a 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 including a first TCI state, the first TCI state being an active TCI state among the at least one TCI states; receive a first MAC CE, the first MAC CE indicating the identifier of the first cell; In response to the receipt of the first MAC CE, a first handover procedure is performed; Whether the first handover process is free from 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 handover process is free from 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 one resource group is configured in the first cell and the first TA of the first cell is measured, the first handover process is free from random access; if at least two resource groups are configured in the first cell, the first handover process is not free from random access.

7. The method for use in a first node of wireless communication according to claim 6, characterized in that, The statement that the first handover process is not exempt from random access if at least the first cell is configured with at least two resource groups includes: the first handover process is not exempt from random access as long as the first cell is configured with at least two resource groups.

8. The method used in a first node for wireless communication according to any one of claims 6 or 7, characterized in that, include: In response to the first TA measuring the first cell, start or restart the first timer; Specifically, the first timer in the first cell is measured to be running, including the first timer.

9. The method used in a first node for wireless communication according to any one of claims 6 or 7, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

10. The method for use in a first node of wireless communication according to claim 8, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

11. A second node used for wireless communication, characterized in that, include: The second transmitter sends a first RRC message, which 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 including a first TCI state, the first TCI state being an active TCI state among the at least one TCI states; and sends a first MAC CE, which indicates the identifier of the first cell. In response to the receipt of the first MAC CE, the receiver of the first RRC message performs a first handover procedure. Whether the first handover procedure 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. The dependence of the first handover procedure on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured includes: if at least one resource group is configured in the first cell and the first TA of the first cell is measured, the first handover procedure is free of random access; if at least two resource groups are configured in the first cell, the first handover procedure is not free of random access.

12. The second node according to claim 11, characterized in that, The statement that the first handover process is not exempt from random access if at least the first cell is configured with at least two resource groups includes: the first handover process is not exempt from random access as long as the first cell is configured with at least two resource groups.

13. The second node according to any one of claims 11 or 12, characterized in that, In response to the measurement of the first TA of the first cell, the receiver of the first RRC message starts or restarts the first timer; wherein the measurement of the first TA of the first cell includes the first timer being running.

14. The second node according to any one of claims 11 or 12, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

15. The second node according to claim 13, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

16. A method used in a second node of wireless communication, characterized in that, include: Send 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 including a first TCI state, the first TCI state being an active TCI state among the at least one TCI states; send a first MAC CE, the first MAC CE indicating the identifier of the first cell; In response to the receipt of the first MAC CE, the receiver of the first RRC message performs a first handover procedure. Whether the first handover procedure 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. The dependence of the first handover procedure on the number of resource groups configured in the first cell and whether the first TA of the first cell is measured includes: if at least one resource group is configured in the first cell and the first TA of the first cell is measured, the first handover procedure is free of random access; if at least two resource groups are configured in the first cell, the first handover procedure is not free of random access.

17. The method for use in a second node for wireless communication according to claim 16, characterized in that, The statement that the first handover process is not exempt from random access if at least the first cell is configured with at least two resource groups includes: the first handover process is not exempt from random access as long as the first cell is configured with at least two resource groups.

18. The method for use in a second node for wireless communication according to any one of claims 16 or 17, characterized in that, In response to the first TA being measured in the first cell, the receiver of the first RRC message starts or restarts the first timer; Specifically, the first timer in the first cell is measured to be running, including the first timer.

19. The method used in a second node for wireless communication according to any one of claims 16 or 17, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

20. The method for use in a second node for wireless communication according to claim 18, characterized in that, The first TA of the first cell was measured to include the operation of a second timer; the second timer was 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 tag of the first cell depends on the first tag.

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