Method and apparatus in communication node used for wireless communication

Abstract

The invention discloses a method and an apparatus in a communication node used for wireless communication. A communication node receives a first RRC message, wherein the first RRC message configures at least one candidate cell; monitoring a first DCI format, wherein the first DCI format comprises a first domain; wherein the first domain indicates whether the first DCI format comprises a second domain, and the second domain indicates a timing advance value of at least one candidate cell configured for the first RRC message; the target cell is a candidate cell configured by the first RRC message, the cell switching type for the target cell depends on whether the target cell has an effective timing advance value or not, and the cell switching type is one of random access-based cell switching or random access-lacking cell switching.

Description

Technical Field

[0001] The present application relates to a transmission method and apparatus in a wireless communication system, and particularly to a method and apparatus for indicating a timing advance value. Background Art

[0002] With the continuous development of wireless communication, the requirements for mobility, transmission delay, and system capacity are getting higher and higher. In R18, 3GPP completed the standardization work of L1 (Layer 1) / L2 (Layer 2) Triggered Mobility (LTM) through the "Further NR mobility enhancements" research project (Work Item, WI); in order to enhance the LTM process and reduce the communication interruption time, LTM supports early uplink synchronization. The serving cell triggers random access on the LTM candidate cell through a PDCCH order. After the UE sends a Preamble on the LTM candidate cell, it does not receive an RAR on the candidate cell. The serving cell sends the timing advance (TA) of the candidate cell to the UE through an LTM Cell Switch Command MAC CE; or through high-layer signaling configuration, measurements based on the TA value of the UE are performed on the LTM candidate cell.

[0003] The random access (RA) process plays a very important role in wireless communication. Therefore, obtaining the TA of the LTM candidate cell through the random access process is a current mainstream technical means. Summary of the Invention

[0004] In the traditional solution, after the UE sends a Preamble on the LTM candidate cell and does not receive an RAR on the candidate cell, the serving cell sends an LTM Cell Switch Command MAC CE to inform the UE of the TA of the candidate cell, which will increase the delay of obtaining the TA and reduce the reliability of handover; the applicant found through research that after sending a Preamble on the LTM candidate cell, using the scheduled PDCCH to carry the TA value of the corresponding candidate cell is beneficial for the UE to quickly obtain the TA value of the candidate cell and reduce the waste of scheduling resources.

[0005] In view of the above problems, the present application provides a solution for indicating the timing advance value. In the above problem description, the NR system is taken as an example. The present application is also applicable to scenarios such as LTE (Long-Term Evolution), LTE-A (Long-Term Evolution Advanced), or future 6G systems, achieving technical effects similar to those of the NR system; further, although the present application gives specific implementation manners for continuous transmission scenarios, the present application can also be used in DRX or Cell-DRX scenarios, achieving technical effects similar to those of continuous transmission scenarios. Further, although the present application gives specific implementation manners for 3GPP systems, the present application can also be used in non-3GPP system scenarios, achieving technical effects similar to those of 3GPP systems. Further, although the original intention of the present application is for LTM, the present application can also be used in CHO, CPC, or conditional LTM, etc., achieving technical effects similar to those of LTM. Further, although the original intention of the present application is for the candidate cell scenario, the present application can also be used in subsequent candidate cell scenarios, achieving technical effects similar to those of candidate cells. Further, although the original intention of the present application is for the Uu air interface, the present application can also be used in the PC5 interface, achieving technical effects similar to those of the Uu air interface. Further, although the original intention of the present application is for the terminal and base station scenario, the present application is also equally applicable to the V2X (Vehicle-to-Everything) scenario, the communication scenarios between the terminal and the relay, and between the relay and the base station, achieving technical effects similar to those in the terminal and base station scenario. Further, although the original intention of the present application is for the terminal and base station scenario, the present application is also equally applicable to the IAB (Integrated Access and Backhaul) communication scenario, achieving technical effects similar to those in the terminal and base station scenario. Further, although the original intention of the present application is for the terrestrial network (TN) scenario, the present application is also equally applicable to the non-terrestrial network (NTN) communication scenario, achieving technical effects similar to those in the TN scenario. Further, although the original intention of the present application is for the traditional communication waveform transmission scenario, the present application is also equally applicable to the transmission scenario combining communication and sensing waveforms, achieving technical effects similar to those in the traditional communication waveform transmission scenario. In addition, adopting a unified solution for different scenarios helps to reduce the hardware complexity and cost.

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

[0007] As an example, the interpretation of the terms in this application refers to the definitions in the 3GPP specification protocol series TS37.

[0008] As an example, the interpretation of the terms in this application refers to the definitions in the 3GPP specification protocol series TS38.

[0009] It should be noted that, without conflict, the embodiments and features in any node of this application can be applied to any other node. Without conflict, the embodiments and features in the embodiments of this application can be combined with each other arbitrarily.

[0010] This application discloses a method used in a first node for wireless communication, characterized by including:

[0011] Receiving a first RRC message, the first RRC message configuring at least one candidate cell; monitoring a first DCI format, the first DCI format including a first field;

[0012] Wherein, the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured for the first RRC message; the target cell is a candidate cell configured for the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of cell handover based on random access or cell handover without random access.

[0013] As an example, the problems to be solved by this application include: how to indicate a timing advance value in the first DCI format.

[0014] As an example, the characteristics of the above method include: the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured for the first RRC message.

[0015] As an example, the problems to be solved by this application include: how to indicate that the first DCI format includes a second field.

[0016] As an example, the characteristics of the above method include: the first DCI format includes a first field, the first field indicating whether the first DCI format includes a second field.

[0017] As an example, the problems to be solved by this application include: how to determine the cell handover type for the target cell.

[0018] As an embodiment, the characteristics of the above method include: the target cell is a candidate cell configured by the first RRC message, the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of cell handover based on random access or cell handover without random access.

[0019] As an embodiment, the advantages of the above method include: it is beneficial to reduce the waste of scheduling resources.

[0020] As an embodiment, the advantages of the above method include: it is beneficial to reduce signaling overhead.

[0021] As an embodiment, the advantages of the above method include: it is beneficial to quickly obtain TA.

[0022] As an embodiment, the advantages of the above method include: it is beneficial to reduce the restrictions on cell handover types.

[0023] As an embodiment, the advantages of the above method include: reusing existing signaling and having a simple protocol implementation.

[0024] According to one aspect of the present application, it is characterized in that it includes:

[0025] Receiving a first DCI format, the first DCI format includes the second field, and the second field includes a timing advance value for the target cell;

[0026] As a response to the reception of the first DCI format, start or restart a first timer;

[0027] As an embodiment, the problems to be solved by the present application include: how the first DCI format indicates the timing advance value of the target cell.

[0028] As an embodiment, the characteristics of the above method include: receiving a first DCI format, the first DCI format includes the second field, and the second field includes a timing advance value for the target cell.

[0029] As an embodiment, the problems to be solved by the present application include: when to start or restart the first timer.

[0030] As an embodiment, the characteristics of the above method include: as a response to the reception of the first DCI format, start or restart a first timer.

[0031] As an embodiment, the advantages of the above method include: it is beneficial to quickly obtain the TA of the target cell.

[0032] As an embodiment, the benefits of the above method include: it is beneficial to avoid the TA value obtained due to the expiration of the first timer being invalid.

[0033] According to one aspect of the present application, it is characterized in that when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0034] As an embodiment, the problems to be solved by the present application include: when the first DCI indicates a timing advance value, whether other configuration information needs to be included.

[0035] As an embodiment, the characteristics of the above method include: when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0036] As an embodiment, the benefits of the above method include: it is beneficial to obtain the TCI state.

[0037] According to one aspect of the present application, it is characterized in that it includes:

[0038] Transmit a first preamble on the target cell;

[0039] Among them, transmitting the first preamble on the target cell triggers the monitoring of the first DCI format.

[0040] As an embodiment, the problems to be solved by the present application include: when to monitor the first DCI format.

[0041] As an embodiment, the characteristics of the above method include: transmitting the first preamble on the target cell triggers the monitoring of the first DCI format.

[0042] As an embodiment, the benefits of the above method include: reusing existing mechanisms.

[0043] According to one aspect of the present application, it is characterized in that the monitoring of the first DCI format depends on the first RRC message including the first information block.

[0044] As an embodiment, the problems to be solved by the present application include: how to configure the configuration information for monitoring the first DCI format.

[0045] As an embodiment, the characteristics of the above method include: the first RRC message includes the first information block, and the first information block configures the configuration information for monitoring the first DCI format.

[0046] As an embodiment, the benefits of the above method include: reducing signaling interaction.

[0047] According to one aspect of the present application, it is characterized in that the first information block indicates the time-frequency resources for listening to the first DCI format on the target cell.

[0048] As an embodiment, the problems to be solved by the present application include: how the first information block indicates listening to the first DCI format.

[0049] As an embodiment, the characteristics of the above method include: the first information block indicates the time-frequency resources for listening to the first DCI format on the target cell.

[0050] As an embodiment, the advantages of the above method include: it is beneficial to increase the probability of receiving the first DCI format.

[0051] As an embodiment, the advantages of the above method include: it is beneficial to improve communication robustness.

[0052] According to one aspect of the present application, it is characterized in that it includes:

[0053] Before transmitting the first Preamble on the target cell, receive a second DCI;

[0054] Wherein, the second DCI indicates the target cell and the first Preamble.

[0055] As an embodiment, the problems to be solved by the present application include: how to trigger the transmission of the first Preamble.

[0056] As an embodiment, the characteristics of the above method include: before transmitting the first Preamble on the target cell, receive a second DCI; the second DCI indicates the target cell and the first Preamble.

[0057] As an embodiment, the advantages of the above method include: the transmission of the first Preamble is triggered by a DCI signaling, saving the resources used to determine the first Preamble.

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

[0059] Before transmitting the first Preamble on the target cell, determine the first Preamble;

[0060] Wherein, the determination of the first Preamble depends on the measurement of the reference signal associated with the first Preamble.

[0061] As an embodiment, the problems to be solved by the present application include: how to determine the first Preamble.

[0062] As an embodiment, the characteristics of the above method include: the determination of the first Preamble depends on the measurement of the reference signal associated with the first Preamble.

[0063] As an embodiment, the advantages of the above method include: improving the autonomy on the UE side.

[0064] The present application discloses a method used in a second node for wireless communication, which is characterized by including:

[0065] Sending a first RRC message, the first RRC message configuring at least one candidate cell; sending a first DCI format, the first DCI format including a first field;

[0066] Wherein, the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured by the first RRC message; the target cell is one of the candidate cells configured by the first RRC message, and the type of cell handover initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access and a cell handover without random access.

[0067] According to one aspect of the present application, it is characterized in that, in response to the reception of the first DCI format, the receiver of the first DCI format starts or restarts a first timer; the first timer controls the time of uplink time alignment of the target cell; having a valid timing advance value for the target cell depends on the first timer being running.

[0068] According to one aspect of the present application, it is characterized in that when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0069] According to one aspect of the present application, it is characterized in that the receiver of the first RRC message sends a first Preamble to the target cell, and sending the first Preamble on the target cell triggers the receiver of the first RRC message to monitor the first DCI format.

[0070] According to one aspect of the present application, it is characterized in that the receiver of the first RRC message monitors the first DCI format depending on the first RRC message including the first information block.

[0071] According to one aspect of the present application, it is characterized in that the first information block indicates the time-frequency resources for listening to the first DCI format on the target cell.

[0072] According to one aspect of the present application, it includes:

[0073] Before the receiver of the first RRC message sends the first Preamble on the target cell, send the second DCI.

[0074] Wherein, the second DCI indicates the target cell and the first Preamble.

[0075] According to one aspect of the present application, it is characterized in that the determination of the first Preamble depends on the measurement of the reference signal associated with the first Preamble.

[0076] The present application discloses a method in a third node for wireless communication, which includes:

[0077] Receive a first Preamble; send the first DCI format, and the first DCI format includes a first field;

[0078] Wherein, the reception of the first Preamble triggers the sending of the first DCI format; the first field indicates whether the first DCI format includes a second field, and the second field indicates the timing advance value for at least one candidate cell; the target cell is one of the at least one candidate cells, and the type of cell handover initiated by the sender of the first Preamble for the target cell depends on whether there is an effective timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access or a cell handover without random access.

[0079] The present application discloses a first node for wireless communication, which includes:

[0080] A first receiver, which receives a first RRC message, the first RRC message configures at least one candidate cell; listens to a first DCI format, and the first DCI format includes a first field;

[0081] Wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured for the first RRC message; a target cell is one of the candidate cells configured for the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access and a cell handover without random access.

[0082] This application discloses a second node used for wireless communication, which is characterized by including:

[0083] A second transmitter, which sends a first RRC message that configures at least one candidate cell; and sends a first DCI format that includes a first field;

[0084] Wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured for the first RRC message; a target cell is one of the candidate cells configured for the first RRC message, and the cell handover type initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access and a cell handover without random access.

[0085] This application discloses a third node used for wireless communication, which is characterized by including:

[0086] A third processor, which receives a first preamble; and sends the first DCI format that includes a first field;

[0087] Wherein, the reception of the first preamble triggers the sending of the first DCI format; the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell; a target cell is one of the at least one candidate cells, and the cell handover type initiated by the sender of the first preamble for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access and a cell handover without random access.

[0088] As an embodiment, compared with traditional solutions, this application has at least one of the following advantages:

[0089] -. It is beneficial to reduce communication interruption caused by handover;

[0090] -. It is beneficial to save scheduling resources;

[0091] -. It is beneficial to quickly obtain TA;

[0092] -. It is beneficial to improve cell handover performance;

[0093] -. Achieve forward compatibility of the protocol;

[0094] -. Reduce signaling overhead. Description of the Drawings

[0095] By reading the following detailed description of the non - restrictive embodiments with reference to the accompanying drawings, other features, objectives, and advantages of the present application will become more apparent:

[0096] Figure 1 Shows a flowchart of the communication of the first node according to an embodiment of the present application;

[0097] Figure 2 Shows a schematic diagram of the network architecture according to an embodiment of the present application;

[0098] Figure 3 Shows a schematic diagram of an embodiment of the radio protocol architecture of the user plane and the control plane according to an embodiment of the present application;

[0099] Figure 4 Shows a schematic diagram of the first communication device and the second communication device according to an embodiment of the present application;

[0100] Figure 5 Shows a flowchart of the wireless signal transmission according to an embodiment of the present application;

[0101] Figure 6 Shows a flowchart of the first DCI format triggering the start or restart of the first timer according to an embodiment of the present application;

[0102] Figure 7 Shows a flowchart of the first DCI format indicating at least one TCI state according to an embodiment of the present application;

[0103] Figure 8 Shows a flowchart of the first Preamble triggering the monitoring of the first DCI format according to an embodiment of the present application;

[0104] Figure 9 Shows a flowchart of the first RRC message including the first information block according to an embodiment of the present application;

[0105] Figure 10The figure shows a schematic diagram of a first information block indicating the time-frequency resources for listening to the first DCI format on the target cell according to an embodiment of the present application.

[0106] Figure 11 The figure shows a transmission flowchart of another wireless signal according to an embodiment of the present application;

[0107] Figure 12 The figure shows a flowchart for determining a first preamble based on measurements of a reference signal associated with the first preamble according to an embodiment of the present application;

[0108] Figure 13 The figure shows a structural block diagram of a processing device in a first node according to an embodiment of the present application;

[0109] Figure 14 The figure shows a structural block diagram of a processing device in a second node according to an embodiment of the present application;

[0110] Figure 15 The figure shows a structural block diagram of a processing device in a third node according to an embodiment of the present application. Detailed implementation manners

[0111] The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily.

[0112] Example 1

[0113] Embodiment 1 exemplifies a flowchart of the communication of a first node according to an embodiment of the present application, as shown in the accompanying Figure 1 figures. In the accompanying Figure 1 figures, each block represents a step. It should be particularly emphasized that the order of the various blocks in the figure does not represent the chronological order between the represented steps.

[0114] In Embodiment 1, in step 101, the first node in the present application receives a first RRC message, and the first RRC message configures at least one candidate cell; in step 102, it monitors a first DCI format, and the first DCI format includes a first field; wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured for the first RRC message; the target cell is one of the candidate cells configured by the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of cell handover based on random access and cell handover without random access.

[0115] As an embodiment, the first RRC message includes an RRCReconfiguration message.

[0116] As an embodiment, the first RRC message includes an RRCReconfiguration-v1610-IEs.

[0117] As an embodiment, the first RRC message includes an RRCReconfiguration-v1800-IEs.

[0118] As an embodiment, the first RRC message includes a conditionalReconfiguration IE.

[0119] As an embodiment, the first RRC message includes an ltm-Config IE.

[0120] As an embodiment, the first RRC message is an RRCReconfiguration message.

[0121] As an embodiment, the first RRC message is an ltm-Config IE.

[0122] As an embodiment, the first RRC message configures the configuration information and execution conditions for any one of the at least one candidate cell.

[0123] As an embodiment, the configuration information includes a configuration identifier.

[0124] As an embodiment, the configuration information includes reference configuration information.

[0125] As an embodiment, the configuration information includes delta configuration information.

[0126] As an embodiment, the configuration information includes uplink transmission scheduling information.

[0127] As an embodiment, the configuration information includes measurement configuration information.

[0128] As an embodiment, the configuration information includes TCI-States configuration information.

[0129] As an embodiment, the configuration information includes measurement configuration information of the timing advance value.

[0130] As an embodiment, the configuration information includes the cell identifier of any one of the candidate cells.

[0131] As a sub-embodiment of the above embodiment, the cell identifier is a logical identifier.

[0132] As a sub-embodiment of the above embodiment, the cell identifier is a bit string.

[0133] As a sub-embodiment of the above embodiment, the cell identifier includes NCGI (NR Cell Global Identifier).

[0134] As a sub-embodiment of the above embodiment, the cell identifier includes CGI (Cell Global Identifier).

[0135] As a sub-embodiment of the above embodiment, the cell identifier includes PLMN (Public Land Mobile Network).

[0136] As a sub-embodiment of the above embodiment, the cell identifier includes SNPN (Stand-alone Non-Public Network).

[0137] As a sub-embodiment of the above embodiment, the cell identifier includes PCI (Physical Cell Identity).

[0138] As an embodiment, the execution condition is the execution condition for the configuration information of any one of the candidate cells to be applied.

[0139] As an embodiment, the execution condition is the execution condition for the measurement result of any one of the candidate cells to be reported.

[0140] As an embodiment, the first RRC message configures the random access resources of any one of the at least one candidate cell.

[0141] As an embodiment, the random access resource is a CFRA resource.

[0142] As an embodiment, the random access resource is a CBRA resource.

[0143] As an embodiment, the random access resource is at least one of a CFRA resource and a CBRA resource.

[0144] As an embodiment, the random access resource is a dedicated resource.

[0145] As an embodiment, the first RRC message configures the configuration information, random access resource, and execution condition of any one of the at least one candidate cell.

[0146] As an embodiment, any one of the at least one candidate cell is an LTM candidate cell.

[0147] As an embodiment, any one of the at least one candidate cell is a C-LTM candidate cell.

[0148] As an embodiment, any one of the at least one candidate cell is a CHO candidate cell.

[0149] As an embodiment, any one of the at least one candidate cell is a CPA candidate cell.

[0150] As an embodiment, any one of the at least one candidate cell is a CPC candidate cell.

[0151] As an embodiment, any one of the at least one candidate cell is a subsequent candidate cell.

[0152] As an embodiment, any one of the at least one candidate cell is configured for a serving cell.

[0153] As an embodiment, any one of the at least one candidate cell is for a serving cell.

[0154] As an embodiment, any one of the at least one candidate cell is a candidate cell of a serving cell.

[0155] As an embodiment, the serving cell is a PCell.

[0156] As an embodiment, the serving cell is a PSCell.

[0157] As an embodiment, the first DCI format is monitored on the serving cell.

[0158] As an embodiment, monitor the first DCI format on one of the at least one candidate cells.

[0159] As an embodiment, monitor the first DCI format on at least one of the at least one candidate cells.

[0160] As a sub - embodiment of the above - mentioned embodiment, the monitoring of the first DCI format is triggered by the transmission of a preamble.

[0161] As a sub - embodiment of the above - mentioned embodiment, the monitoring of the first DCI format does not depend on the random access procedure.

[0162] As a sub - embodiment of the above - mentioned embodiment, the monitoring of the first DCI format is triggered by the transmission of a measurement report.

[0163] As a sub - embodiment of the above - mentioned embodiment, the monitoring of the first DCI format depends on the application of the first RRC message.

[0164] As a sub - embodiment of the above - mentioned embodiment, the application of the first RRC message means that the first RRC message is delivered to the RRC layer.

[0165] As a sub - embodiment of the above - mentioned embodiment, the application of the first RRC message means that the first RRC message indicates to monitor the first DCI format.

[0166] As a sub - embodiment of the above - mentioned embodiment, the application of the first RRC message means that the first RRC message configures the time - frequency resources for monitoring the first DCI format.

[0167] As a sub - embodiment of the above - mentioned embodiment, the application of the first RRC message means that the first RRC message indicates to perform a random - access - free handover to one of the at least one candidate cells.

[0168] As an embodiment, the first DCI format is DCI format 1_0.

[0169] As an embodiment, the first DCI format is DCI format 1_0, and the CRC of the DCI format 1_0 is scrambled by a C - RNTI.

[0170] As an embodiment, the first DCI format is DCI format 1_0, and the CRC of the DCI format 1_0 is scrambled by a RA - RNTI.

[0171] As an example, the first DCI format is DCI format 1_0, and the CRC of the DCI format 1_0 is scrambled by a MsgB-RNTI.

[0172] As an example, the first DCI format is DCI format 1_1.

[0173] As an example, the first DCI format is DCI format 1_1, and the CRC of the DCI format 1_1 is scrambled by a C-RNTI.

[0174] As an example, the first DCI format is a DCI format other than DCI format 1_0 and DCI format 1_1.

[0175] As an example, the CRC of the first DCI format is scrambled by a RA-RNTI; the monitoring of the first DCI format is triggered by the transmission of a Preamble.

[0176] As an example, the CRC of the first DCI format is scrambled by a MsgB-RNTI; the monitoring of the first DCI format is triggered by the transmission of a MsgA.

[0177] As an example, the C-RNTI is the C-RNTI of the first node in the serving cell.

[0178] As an example, the first DCI format includes a first field and the first DCI format includes a second field.

[0179] As a sub-example of the above example, when the first DCI format includes a second field, the first DCI format includes a first field.

[0180] As a sub-example of the above example, when at least the first DCI format includes a second field, the first DCI includes a first field.

[0181] As a sub-example of the above example, only when the first DCI format includes a second field, the first DCI format includes a first field.

[0182] As a sub-example of the above example, when the first DCI format does not include a second field, the first DCI includes a first field.

[0183] As a sub-example of the above example, when the first DCI format does not include a second field, the first DCI does not include a first field.

[0184] As an example, the first field explicitly indicates whether the first DCI format includes the second field.

[0185] As an example, the first field implicitly indicates whether the first DCI format includes the second field.

[0186] As an example, a bit in the first field is present to indicate that the first DCI format includes the second field.

[0187] As an example, a bit in the first field is set to a specific value to indicate that the first DCI format includes the second field.

[0188] As an example, the first field is set to a first value to indicate that the first DCI format includes the second field; the first field not being set to the first value indicates that the first DCI format does not include the second field; the first value is a non - negative integer; the first value is predefined.

[0189] As an example, the first field is a Frequency domain resource assignment field.

[0190] As an example, the first field is a Frequency domain resource assignment field; the first field being set to all 1s indicates that the first DCI format includes the second field; the first field not being set to all 1s indicates that the first DCI format does not include the second field.

[0191] As an example, the first field is a Frequency domain resource assignment field; the first field being set to all 1s indicates that the first DCI format includes the second field; the first field not being set to all 1s indicates that the first DCI format does not include the second field; the first DCI format is scrambled with a C - RNTI and the first DCI format is not for indicating a Preamble.

[0192] As an example, the first field is a Frequency domain resource assignment field; the first field being set to all 0s indicates that the first DCI format includes the second field; the first field not being set to all 0s indicates that the first DCI format does not include the second field.

[0193] As an example, the first field is a Frequency domain resource assignment field; the first field being set to all 0s indicates that the first DCI format includes the second field; the first field not being set to all 0s indicates that the first DCI format does not include the second field; the first DCI format is scrambled by a C-RNTI and the first DCI format is for indicating a Preamble.

[0194] As an example, the first field is a Random Access Preamble index field; the CRC of the first DCI format is scrambled by a C-RNTI; the Frequency domain resource assignment field in the first signaling is set to all 1s.

[0195] As a sub-example of the above example, the first DCI format is not for indicating a Preamble.

[0196] As a sub-example of the above example, the first DCI format is sent before the start of a random access procedure.

[0197] As a sub-example of the above example, the Random Access Preamble index field being set to 0b000000 indicates that the first DCI format includes the second field.

[0198] As a sub-example of the above example, the Random Access Preamble index field being set to 0b000000 indicates that the first DCI format does not include the second field.

[0199] As a sub-example of the above example, the Random Access Preamble index field not being set to 0b000000 indicates that the first DCI format does not include the second field.

[0200] As a sub-example of the above example, the Random Access Preamble index field is set to a dedicated value, and the dedicated value is for indicating that the first DCI format includes the second field.

[0201] As an example, the first field is a Frequency domain resource assignment field and a Random Access Preamble index field; the CRC of the first DCI format is scrambled by a C-RNTI.

[0202] As a sub - embodiment of the above - mentioned embodiment, the one Frequency domain resource assignment field is set to all 1s and the one Random Access Preamble index field is set to 0b000000, indicating that the first DCI format includes the second field.

[0203] As a sub - embodiment of the above - mentioned embodiment, the one Frequency domain resource assignment field is not set to all 1s or the one Random Access Preamble index field is not set to 0b000000, indicating that the first DCI format does not include the second field.

[0204] As an embodiment, the first field is an indication field, the CRC of the first DCI format is scrambled by a C - RNTI, the one Frequency domain resource assignment field is set to all 1s and the one Random Access Preamble index field is not set to 0b000000.

[0205] As a sub - embodiment of the above - mentioned embodiment, the first field is set to 1, indicating that the first DCI format includes the second field.

[0206] As a sub - embodiment of the above - mentioned embodiment, the first field is set to 0, indicating that the first DCI format does not include the second field.

[0207] As a sub - embodiment of the above - mentioned embodiment, the first field not being set indicates that the first DCI format does not include the second field.

[0208] As a sub - embodiment of the above - mentioned embodiment, the first field not being set means that the first field is reserved.

[0209] As a sub - embodiment of the above - mentioned embodiment, the first field not being set means that the first field is the default value.

[0210] As an embodiment, the first DCI format includes a Cell indicator field.

[0211] As an embodiment, the first DCI format includes a Cell indicator field; the CRC of the first DCI format is scrambled by a C - RNTI.

[0212] As a sub - embodiment of the above - mentioned embodiment, the one Cell indicator field indicates any one of the at least one candidate cell.

[0213] As a sub - embodiment of the above - mentioned embodiment, the one Cell indicator field indicates multiple cells among the at least one candidate cell.

[0214] As a sub - embodiment of the above - mentioned embodiment, the number of bits occupied by the one Cell indicator field depends on the number of cells indicated by the one Cell indicator field.

[0215] As a sub - embodiment of the above - mentioned embodiment, the number of bits occupied by the one Cell indicator field is equal to log2(number of cells indicated by the one Cell indicator field + 1).

[0216] As a sub - embodiment of the above - mentioned embodiment, the number of bits occupied by the one Cell indicator field is equal to floor(log2(number of cells indicated by the one Cell indicator field + 1)).

[0217] As a sub - embodiment of the above - mentioned embodiment, the number of bits occupied by the one Cell indicator field is preset.

[0218] As an embodiment, when the first DCI format includes the second field, the first DCI format includes a Cell indicator field.

[0219] As a sub - embodiment of the above - mentioned embodiment, when the first DCI format includes the second field, the first DCI format includes a Cell indicator field, and the one Cell indicator field indicates the cell associated with the second field; the CRC of the first DCI format is scrambled by C - RNTI.

[0220] As a sub - embodiment of the above - mentioned embodiment, when the first DCI format includes the second field, the first DCI format includes a Cell indicator field, and the one Cell indicator field indicates one candidate cell among at least one candidate cell; the CRC of the first DCI format is scrambled by RA - RNTI; the RA - RNTI is calculated according to the time - frequency resources of the first Preamble; the first Preamble is sent to the cell indicated by the one Cell indicator field.

[0221] As an example, when the first DCI format includes the second field, the first DCI format includes a Random Access Preamble index field.

[0222] As an example, when the first DCI format includes the second field, the first DCI format includes a PRACH Mask index field.

[0223] As an example, when the first DCI format includes the second field, the first DCI format includes random access resource information associated with the second field.

[0224] As an example, when the first DCI format does not include the second field, the first DCI format includes scheduling information for the PDSCH; the scheduling information includes at least one of frequency domain resource assignment, time domain resource assignment, or modulation and coding scheme (MCS).

[0225] As an example, the second field indicates a timing advance value for only one candidate cell among at least one candidate cell configured for the first RRC message.

[0226] As an example, the second field indicates timing advance values for multiple candidate cells among at least one candidate cell configured for the first RRC message.

[0227] As a sub - example of the above example, the second field indicates timing advance values for multiple candidate cells among at least one candidate cell configured for the first RRC message; the first DCI format includes the second field; the CRC of the first DCI format is scrambled by C - RNTI.

[0228] As an example, the second field indicates a timing advance value for one or more candidate cells among at least one candidate cell configured for the first RRC message.

[0229] As an example, the timing advance value is a TA.

[0230] As an example, the timing advance value is multiple TAs.

[0231] As an example, the timing advance value is the difference between the current TA of one candidate cell of the at least one candidate cell and the current TA of a reference TA.

[0232] As an example, the timing advance value is the difference between the current TA of multiple candidate cells of the at least one candidate cell and the current TA of a reference TAG.

[0233] As an example, the one reference TAG ID is indicated by the first DCI format.

[0234] As an example, the one reference TAG is the current TAG of the first node.

[0235] As an example, the one reference TAG is the PTAG of the first node.

[0236] As an example, the current TA in the one reference TAG is valid.

[0237] As an example, the timing advance value is the difference between the current TA of one candidate cell of the at least one candidate cell and the current TA of the serving cell.

[0238] As an example, the timing advance value is the difference between the current TAs of multiple candidate cells of the at least one candidate cell and the current TA of the serving cell.

[0239] As an example, the timing advance value is the TA adjustment value of a candidate cell PTAG.

[0240] As an example, the timing advance value is the absolute value of TA of a candidate cell PTAG.

[0241] As an example, the timing advance value is indicated by the Timing Advance Command field.

[0242] As an example, the timing advance value is indicated by the Timing Advance Command field with a length of 4 bits.

[0243] As an example, the timing advance value is indicated by the Timing Advance Command field with a length of 6 bits.

[0244] As an example, the timing advance value is indicated by the Timing Advance Command field with a length of 8 bits.

[0245] As an example, the timing advance value is indicated by the Timing Advance Command field with a length of 12 bits.

[0246] As an example, the Timing Advance Command field is indicated as set to FFF, indicating that the timing advance value is invalid.

[0247] As an example, the Timing Advance Command field is indicated as set to all 1s, indicating that the timing advance value is invalid.

[0248] As an example, the second field includes the Timing Advance Command field.

[0249] As an example, the second field includes the Timing Advance Command field, and the timing advance value is valid.

[0250] As an example, the target cell is one of the candidate cells configured by the first RRC message.

[0251] As an example, the target cell is a candidate cell for performing a handover configured by the first RRC message.

[0252] As an example, the target cell is a candidate cell for performing an LTM conversion configured by the first RRC message.

[0253] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell means that whether the cell handover type is the random access-based cell handover or the cell handover without random access depends on whether there is a valid timing advance value for the target cell.

[0254] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: when there is at least a valid timing advance value for the target cell, the cell handover type for the target cell is the random access-based cell handover.

[0255] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: when there is at least no valid timing advance value for the target cell, the cell handover type for the target cell is the random access-based cell handover.

[0256] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: when there is at least a valid timing advance value for the target cell, the cell handover type for the target cell is the cell handover without random access.

[0257] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: when there is a valid timing advance value for the target cell, the cell handover type for the target cell is the cell handover without random access.

[0258] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: when there is a valid timing advance value for the target cell, the cell handover type for the target cell is the cell handover based on random access.

[0259] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: as long as there is no valid timing advance value for the target cell, the cell handover type for the target cell is the cell handover based on random access.

[0260] As an example, the cell handover type for the target cell depending on whether there is a valid timing advance value for the target cell includes: as long as there is a valid timing advance value for the target cell, the cell handover type for the target cell is the cell handover without random access.

[0261] As an example, the valid timing advance value means that the timer corresponding to the timing advance value has not expired.

[0262] As an example, the valid timing advance value means that the first node believes that the timer corresponding to the timing advance value has not expired.

[0263] As an example, the valid timing advance value means that a new timing advance value has not been received.

[0264] As an example, the valid timing advance value means that the value of the TimingAdvance Command field indicating the timing advance value is not FFF.

[0265] As an embodiment, the effective timing advance value means that the TimingAdvance Command field indicating the timing advance value does not indicate that the timing advance value is invalid.

[0266] As an embodiment, the random access-based cell handover means that the cell handover depends on random access.

[0267] As an embodiment, the random access-based cell handover means that when a cell handover is performed, random access is triggered.

[0268] As an embodiment, the random access-based cell handover means that when a cell handover is triggered, random access is triggered.

[0269] As an embodiment, the random access-based cell handover means that during the cell handover process, random access is triggered.

[0270] As an embodiment, the random access-based cell handover means that a cell handover without random access is not considered to be executed.

[0271] As an embodiment, the random access-based cell handover means RACH based LTM cellswitch.

[0272] As an embodiment, the cell handover without random access means that the cell handover does not depend on random access.

[0273] As an embodiment, the cell handover without random access means that when a cell handover is performed, random access is not triggered.

[0274] As an embodiment, the cell handover without random access means that when a cell handover is triggered, random access is not triggered.

[0275] As an embodiment, the cell handover without random access means that during the cell handover process, random access is not triggered.

[0276] As an embodiment, the cell handover without random access means that during the cell handover process, uplink synchronization is not performed.

[0277] As an embodiment, the cell handover without random access means that a cell handover without random access is considered to be executed.

[0278] As an embodiment, the cell handover without random access means RACH-less LTM cellswitch.

[0279] As an example, the cell handover without random access refers to: RACH-less handover.

[0280] As an example, the first node receives an RRCReconfiguration message, where the RRCReconfiguration message includes configuration information of at least one LTM candidate cell; in response to the application of the RRCReconfiguration message, it listens for DCI format1_0 on the serving cell, and the CRC of the DCI format1_0 is scrambled by C-RNTI; the DCI format1_0 indicates the timing advance value of the at least one candidate cell.

[0281] As an example, the first node receives an RRCReconfiguration message, where the RRCReconfiguration message includes configuration information of at least one LTM candidate cell; in response to the application of the RRCReconfiguration message, it listens for DCI format1_1 on the serving cell, and the CRC of the DCI format1_1 is scrambled by C-RNTI; the DCI format1_1 indicates the timing advance value of the at least one candidate cell.

[0282] As an example, the first node receives an RRCReconfiguration message, where the RRCReconfiguration message includes configuration information of at least one LTM candidate cell; in response to the application of the RRCReconfiguration message, it sends a first Preamble to a target cell among the at least one LTM candidate cells, and listens for DCI format1_0 on the target cell, where the CRC of the DCI format1_0 is scrambled by RA-RNTI; the DCI format1_0 indicates the timing advance value of the target cell.

[0283] As an example, the first node receives an RRCReconfiguration message, where the RRCReconfiguration message includes configuration information of at least one LTM candidate cell; in response to the application of the RRCReconfiguration message, it sends a first Preamble to a target cell among the at least one LTM candidate cells, and listens for DCI format1_0 on the target cell, where the CRC of the DCI format1_0 is scrambled by MsgB-RNTI; the DCI format1_0 indicates the timing advance value of the target cell.

[0284] Example 2

[0285] Example 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the attached Figure 2 figure. The attached Figure 2Describes the network architecture 200 of a 5G NR (New Radio) / LTE (Long-Term Evolution) / LTE-A (Long-Term Evolution Advanced) system. The 5G NR / LTE / LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable term. The 5GS / EPS 200 includes at least one of a UE (User Equipment) 201, a RAN (Radio Access Network) 202, a 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, an HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and an Internet service 230. The 5GS / EPS may be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, the 5GS / EPS provides packet-switched services. However, those skilled in the art will readily understand that the various concepts presented throughout this application can be extended to networks providing circuit-switched services or other cellular networks. The RAN includes a node 203 and other nodes 204. The node 203 provides user and control plane protocol terminations towards the UE 201. The node 203 may be connected to other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. The node 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (Transmission and Reception Point), or some other suitable term. The node 203 provides an access point to the 5GC / EPC 210 for the UE 201. Examples of the UE 201 include cellular phones, smartphones, session initiation protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, non-terrestrial base station communications, satellite mobile communications, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, automobiles, wearable devices, or any other similar functional devices. Those skilled in the art may 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 term.The node 203 is connected to the 5GC / EPC 210 via the S1 / NG interface. The 5GC / EPC 210 includes an MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMFs 214, an S-GW (Service Gateway) / UPF (User Plane Function) 212, and a P-GW (Packet Date Network Gateway) / UPF 213. The MME / AMF / SMF 211 is a control node that processes the signaling between the UE 201 and the 5GC / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocal) packets are transmitted through the S-GW / UPF 212, and the S-GW / UPF 212 is itself 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 the Internet service 230. The Internet service 230 includes operator-corresponding Internet protocol services, which may specifically include the Internet, an intranet, an IMS (IP Multimedia Subsystem), and packet-switched streaming services.

[0286] As an embodiment, the UE 201 corresponds to the first node in the present application.

[0287] As an embodiment, the UE 201 is a user equipment (UE).

[0288] As an embodiment, the UE 201 is a base station (BS) device.

[0289] As an embodiment, the UE 201 is a relay device.

[0290] As an embodiment, the UE 201 is a gateway device.

[0291] As an embodiment, the node 203 corresponds to the second node in the present application.

[0292] As an embodiment, the node 203 is a base station device.

[0293] As an example, the node 203 is a user equipment.

[0294] As an example, the node 203 is a relay device.

[0295] As an example, the node 203 is a gateway device.

[0296] As an example, the node 204 corresponds to the third node in this application.

[0297] As an example, the node 204 is a base station device.

[0298] As an example, the node 204 is a user equipment.

[0299] As an example, the node 204 is a relay device.

[0300] As an example, the node 204 is a gateway device.

[0301] Typically, the UE 201 is a user equipment, and the node 203 is a base station device.

[0302] Typically, the UE 201 is a user equipment, and the node 203 is a user equipment.

[0303] Typically, the UE 201 is a base station device, and the node 203 is a base station device.

[0304] As an example, the user equipment supports the transmission of a Non-Terrestrial Network (NTN).

[0305] As an example, the user equipment supports the transmission of a Terrestrial Network.

[0306] As an example, the user equipment supports Dual Connection (DC) transmission.

[0307] As an example, the user equipment includes an aircraft.

[0308] As an example, the user equipment includes a vehicle-mounted terminal.

[0309] As an example, the user equipment includes a ship.

[0310] As an example, the user equipment includes an Internet of Things terminal.

[0311] As an embodiment, the user equipment includes a terminal of the industrial Internet of Things.

[0312] As an embodiment, the user equipment includes a device that supports low-latency and high-reliability transmission.

[0313] As an embodiment, the user equipment includes a test device.

[0314] As an embodiment, the user equipment includes a signaling tester.

[0315] As an embodiment, the user equipment includes an IAB (Integrated Access and Backhaul)-MT.

[0316] As an embodiment, the user equipment supports dynamic switching using AI (Artificial Intelligence) or machine learning.

[0317] As an embodiment, the user equipment supports generating a trained model using training data or generating some parameters in the trained model using the trained data.

[0318] As an embodiment, the user equipment supports training and applying the first RRC message.

[0319] As an embodiment, the user equipment supports determining at least some information in the first RRC message through training.

[0320] As an embodiment, the user equipment is a terminal that supports Massive-MIMO.

[0321] As an embodiment, the base station equipment supports transmission in a non-terrestrial network.

[0322] As an embodiment, the base station equipment supports transmission in a terrestrial network.

[0323] As an embodiment, the base station equipment includes a Base Transceiver Station (BTS).

[0324] As an embodiment, the base station equipment includes a NodeB (NB).

[0325] As an embodiment, the base station equipment includes a gNB.

[0326] As an embodiment, the base station equipment includes an eNB.

[0327] As an embodiment, the base station device includes an ng-eNB.

[0328] As an embodiment, the base station device includes an en-gNB.

[0329] As an embodiment, the base station device includes a CU (Centralized Unit).

[0330] As an embodiment, the base station device includes a DU (Distributed Unit).

[0331] As an embodiment, the base station device includes a TRP (Transmitter Receiver Point).

[0332] As an embodiment, the base station device includes a macro cellular base station.

[0333] As an embodiment, the base station device includes a micro cell base station.

[0334] As an embodiment, the base station device includes a pico cell base station.

[0335] As an embodiment, the base station device includes a femtocell.

[0336] As an embodiment, the base station device includes a flying platform device.

[0337] As an embodiment, the base station device includes a satellite device.

[0338] As an embodiment, the base station device includes a test device.

[0339] As an embodiment, the base station device includes a signaling tester.

[0340] As an embodiment, the base station device includes a gateway device.

[0341] As an embodiment, the base station device includes an IAB-node.

[0342] As an embodiment, the base station device includes an IAB-donor.

[0343] As an embodiment, the base station device includes an IAB-donor-CU.

[0344] As an embodiment, the base station device includes an IAB-donor-DU.

[0345] As an example, the base station device includes an IAB-DU.

[0346] As an example, the base station device includes an IAB-MT.

[0347] As an example, the base station device supports transmission based on Massive-MIMO.

[0348] As an example, the base station device supports decompressing CSI using AI or deep learning.

[0349] As an example, the base station device supports mobility management using AI or deep learning.

[0350] Example 3

[0351] Embodiment 3 shows a schematic diagram of an embodiment of a radio protocol architecture for a user plane and a control plane according to the present application, as shown in the appendix Figure 3 as follows. Figure 3 It is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300. Figure 3The radio protocol architecture for controlling plane 300 is shown in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (Physical Layer) signal processing functions. The L1 layer will be referred to as PHY301 herein. Layer 2 (L2 layer) 305 is above PHY301 and includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by encrypting data packets and provides handover support. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for disordered reception due to HARQ (Hybrid Automatic Repeat Request). The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) of the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling. The radio protocol architecture of the user plane 350 includes Layer 1 (L1 layer) and Layer 2 (L2 layer). In the user plane 350, the radio protocol architecture is generally the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355. However, the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 also includes an SDAP (Service Data Adaptation Protocol) sublayer 356, and the SDAP sublayer 356 is responsible for mapping between QoS flows and data radio bearers (DRBs) to support service diversity.

[0352] As an example, the Figure 3 radio protocol architecture in is applicable to the first node described in this application.

[0353] As an example, the Figure 3The wireless protocol architecture in [relevant context] is applicable to the second node in this application.

[0354] As an example, attached Figure 3 The wireless protocol architecture in [relevant context] is applicable to the third node in this application.

[0355] As an example, the first RRC message in this application is generated by the RRC 306.

[0356] As an example, the first DCI format in this application is generated by the PHY 301 or PHY 351.

[0357] As an example, the first Preamble in this application is generated by the PHY 301 or PHY 351.

[0358] Example 4

[0359] Example 4 shows a schematic diagram of a first communication device and a second communication device according to this application, as attached Figure 4 as shown. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 that communicate with each other in an access network.

[0360] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter / receiver 454, and an antenna 452.

[0361] The second communication device 410 includes a controller / processor 475, a memory 476, a receive processor 470, a transmit processor 416, a multi-antenna receive processor 472, a multi-antenna transmit processor 471, a transmitter / receiver 418, and an antenna 420.

[0362] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, upper layer data packets from the core network are provided to the controller / processor 475. The controller / processor 475 implements the functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements encoding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, and mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding on the encoded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time domain and / or frequency domain, and then uses the inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. Subsequently, the multi-antenna transmit processor 471 performs transmit analog precoding / beamforming operations on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream and then provides it to different antennas 420.

[0363] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives signals via its respective antenna 452. Each receiver 454 recovers the information modulated onto the radio frequency carrier and converts the radio frequency stream into a baseband multi-carrier symbol stream provided to the receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 perform various signal processing functions of the L1 layer. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receivers 454. The receive processor 456 uses the fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receive analog precoding / beamforming operations from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive processor 456, where the reference signal will be used for channel estimation, and the data signal recovers any spatial streams destined for the first communication device 450 after multi-antenna detection in the multi-antenna receive processor 458. The symbols on each spatial stream are demodulated and recovered in the receive processor 456, and soft decisions are generated. Subsequently, the receive processor 456 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. Subsequently, the upper layer data and control signals are provided to the controller / processor 459. The controller / processor 459 performs the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program code and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the second communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover upper layer data packets from the core network. Subsequently, the upper layer data packets are provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0364] 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 an upper layer data packet to a controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmit function described at the second communication device 410 in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocation, and implements L2 layer functions for both the user plane and the control plane. The controller / processor 459 is also responsible for retransmitting lost packets and signaling to the second communication device 410. A transmit processor 468 performs modulation mapping and channel coding processing. A multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Subsequently, the transmit processor 468 modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, and after an analog precoding / beamforming operation in the multi-antenna transmit processor 457, provides them to different antennas 452 via a transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream and then provides it to the antenna 452.

[0365] 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 described at the first communication device 450 in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to a multi-antenna receive processor 472 and a receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 jointly implement the L1 layer functions. A controller / processor 475 implements the L2 layer functions. The controller / processor 475 may be associated with a memory 476 that stores program code and data. The memory 476 may 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, decryption, header decompression, and control signal processing to recover the upper layer data packet from the UE 450. The upper layer data packet from the controller / processor 475 may be provided to the core network.

[0366] As an example, the first communication device 450 corresponds to the first node in the present application; the first communication device 450 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 is at least: receiving a first RRC message, the first RRC message configuring at least one candidate cell; listening for a first DCI format, the first DCI format including a first field; wherein the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured by the first RRC message; a target cell is one of the candidate cells configured by the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access or a cell handover without random access.

[0367] As an example, the first communication device 450 corresponds to the first node in the present application; the first communication device 450 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generating actions when executed by at least one processor, the actions including: receiving a first RRC message, the first RRC message configuring at least one candidate cell; listening for a first DCI format, the first DCI format including a first field; wherein the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured by the first RRC message; a target cell is one of the candidate cells configured by the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access or a cell handover without random access.

[0368] As an example, the second communication device 410 corresponds to the second node in the present application; the second communication device 410 includes: at least one processor and at least one memory, and 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 is at least configured to: send a first RRC message, the first RRC message configuring at least one candidate cell; send a first DCI format, the first DCI format including a first field; wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured by the first RRC message; the target cell is one of the candidate cells configured by the first RRC message, and the type of cell handover initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access and a cell handover without random access.

[0369] As an example, the second communication device 410 corresponds to the second node in the present application; the second communication device 410 includes: a memory storing a computer-readable instruction program, and the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: sending a first RRC message, the first RRC message configuring at least one candidate cell; sending a first DCI format, the first DCI format including a first field; wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured by the first RRC message; the target cell is one of the candidate cells configured by the first RRC message, and the type of cell handover initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access and a cell handover without random access.

[0370] As an embodiment, the second communication device 410 corresponds to the third node in the present application; the second communication device 410 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used with the at least one processor. The second communication device 410 at least: receives a first Preamble; sends the first DCI format, the first DCI format including a first field; wherein, the reception of the first Preamble triggers the sending of the first DCI format; the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell; the target cell is one of the at least one candidate cells, and the type of cell handover initiated by the sender of the first Preamble for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access or a cell handover lacking random access.

[0371] As an embodiment, the second communication device 410 corresponds to the third node in the present application; the second communication device 410 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generating actions when executed by at least one processor, the actions including: sending a first RRC message, the first RRC message configuring at least one candidate cell; receiving a first Preamble; sending the first DCI format, the first DCI format including a first field; wherein, the reception of the first Preamble triggers the sending of the first DCI format; the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell; the target cell is one of the at least one candidate cells, and the type of cell handover initiated by the sender of the first Preamble for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access or a cell handover lacking random access.

[0372] As an embodiment, at least one of the antenna 420, the transmitter 418, the transmit processor 416, and the controller / processor 475 is used to send the first RRC message.

[0373] As an embodiment, at least one of the antenna 452, the receiver 454, the receive processor 456, and the controller / processor 459 is used to receive the first RRC message.

[0374] As an example, at least one of the antenna 420, the transmitter 418, the transmitting processor 416, and the controller / processor 475 is used to transmit a first DCI format.

[0375] As an example, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive a first DCI format.

[0376] As an example, the first communication device 450 corresponds to the first node in the present application.

[0377] As an example, the first communication device 450 is a user equipment.

[0378] As an example, the first communication device 450 is a base station device.

[0379] As an example, the first communication device 450 is a relay device.

[0380] As an example, the second communication device 410 is a user equipment.

[0381] As an example, the second communication device 410 is a base station device.

[0382] As an example, the second communication device 410 is a relay device.

[0383] Example 5

[0384] Example 5 exemplifies a wireless signal transmission flowchart according to an embodiment of the present application, as shown in the appendix Figure 5 It should be specifically noted that the order in this example does not limit the signal transmission order and implementation order in the present application.

[0385] For First Node U01 , in step S5101, a first RRC message is received, and the first RRC message configures at least one candidate cell; in step S5102, a first Preamble is sent; in step S5103, a first DCI format is listened for, and the first DCI format includes a first field; in step S5104, the first DCI format is received.

[0386] For Second Node N02 , in step S5201, the first RRC message is sent; in step S5202, a first message is received; in step S5203, a first DCI format is sent.

[0387] For Third Node N03, in step S5301, receive the first Preamble; in step S5302, send the first DCI format; in step S5303, send the first message.

[0388] In Embodiment 5, the first field indicates whether the first DCI format includes a second field, and the second field indicates the timing advance value of at least one candidate cell configured for the first RRC message; the target cell is one of the candidate cells configured for the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of cell handover based on random access or cell handover without random access.

[0389] As an embodiment, the first node is a UE.

[0390] As an embodiment, the first node is a UE supporting 3GPP R19.

[0391] As an embodiment, the first node is a UE supporting 6G.

[0392] As an embodiment, there is a wireless connection between the first node U01 and the second node N02.

[0393] As an embodiment, there is a wired connection between the first node U01 and the second node N02.

[0394] As an embodiment, there is a Uu interface connection between the first node U01 and the second node N02.

[0395] As an embodiment, there is an IAB interface connection between the first node U01 and the second node N02.

[0396] As an embodiment, there is a PC5 interface connection between the first node U01 and the second node N02.

[0397] As an embodiment, there is a wireless interface connection between the third node N03 and the second node N02.

[0398] As an embodiment, there is a wired interface connection between the third node N03 and the second node N02.

[0399] As an embodiment, there is an Xn interface connection between the third node N03 and the second node N02.

[0400] As an embodiment, there is an X2 interface connection between the third node N03 and the second node N02.

[0401] As an example, the backhaul between the third node N03 and the second node N02 is ideal.

[0402] As an example, the backhaul between the third node N03 and the second node N02 is non-ideal.

[0403] As an example, the third node N03 is the second node N02.

[0404] As an example, the third node N03 is not the second node N02.

[0405] As an example, the third node N03 and the second node N02 belong to different CUs.

[0406] As an example, the third node N03 and the second node N02 belong to the same CU.

[0407] As an example, the information obtained by the third node N03 is forwarded to the second node N02.

[0408] As an example, the information obtained by the third node N03 is instructed to be forwarded to the second node N02.

[0409] As an example, the second node N02 is the serving base station of the cell served by the first node U01.

[0410] As an example, the third node N03 is the serving base station of the candidate cell configured for the first node U01.

[0411] As an example, the third node N03 is the serving base station of the target cell.

[0412] As an example, the first node U01 receives a first RRC message.

[0413] As an example, the first RRC message configures at least one candidate cell.

[0414] As an example, the dashed box F5.1 is optional.

[0415] As an example, the dashed box F5.1 exists.

[0416] As an example, the first node sends a first preamble.

[0417] As an example, the first node sends a first preamble to a first candidate cell.

[0418] As an example, the first candidate cell is one of the at least one candidate cell configured by the first RRC message.

[0419] As an example, the configuration information of the first candidate cell is configured by the first RRC message.

[0420] As an example, the first candidate cell is the target cell.

[0421] As an example, in response to receiving the first RRC message, the first node sends a first preamble to the first candidate cell.

[0422] As an example, once the first RRC message is received, the first node sends a first preamble to the first candidate cell.

[0423] As an example, when the first RRC message is received, the first node sends a first preamble to the first candidate cell.

[0424] As an example, when at least the first RRC message is received, the first node sends a first preamble to the first candidate cell.

[0425] As an example, in response to the first RRC message being applied, the first node sends a first preamble to the first candidate cell.

[0426] As an example, once the first RRC message is applied, the first node sends a first preamble to the first candidate cell.

[0427] As an example, when the first RRC message is applied, the first node sends a first preamble to the first candidate cell.

[0428] As an example, when at least the first RRC message is applied, the first node sends a first preamble to the first candidate cell.

[0429] As an example, the time-frequency resources of the first preamble are indicated by the first RRC message.

[0430] As an example, the index of the first preamble is indicated by the first RRC message.

[0431] As an example, the first preamble is allocated to the first candidate cell.

[0432] As an example, in response to the first Preamble being sent, listen for the first DCI format.

[0433] As an example, when the first Preamble is sent, listen for the first DCI format.

[0434] As an example, when at least the first Preamble is sent, listen for the first DCI format.

[0435] As an example, when the first Preamble is sent and the first RRC message indicates listening for the first DCI format, listen for the first DCI format.

[0436] As a sub - example of the above embodiment, the first RRC message indicating listening for the first DCI format means that the first RRC message indicates listening for the first DCI on the first candidate cell after the first Preamble is sent.

[0437] As a sub - example of the above embodiment, the first RRC message indicating listening for the first DCI format means that the first RRC message indicates listening for the first DCI on at least the first candidate cell after the first Preamble is sent.

[0438] As a sub - example of the above embodiment, the first RRC message indicating listening for the first DCI format means that the first RRC message indicates starting to listen for the first DCI on the serving cell after the first Preamble is sent.

[0439] As an example, when at least the first Preamble is sent and the first RRC message indicates listening for the first DCI format, listen for the first DCI format.

[0440] As an example, the dashed box F5.1 does not exist.

[0441] As an example, the setting of the content in the first DCI format has nothing to do with the sending of the first Preamble.

[0442] As an example, listening for the first DCI format does not depend on the sending of the first Preamble.

[0443] As an example, the first node U01 listens for the first DCI format.

[0444] As a sub - example of the above embodiment, listening for the first DCI format depends on receiving the first RRC message.

[0445] As a sub - embodiment of the above - mentioned embodiment, in response to receiving the first RRC message, listen for the first DCI format.

[0446] As an ancillary embodiment of the above - mentioned sub - embodiment, when the first RRC message is received, listen for the first DCI format.

[0447] As an ancillary embodiment of the above - mentioned sub - embodiment, when at least the first RRC message is received, listen for the first DCI format.

[0448] As an ancillary embodiment of the above - mentioned sub - embodiment, before the first RRC message is received, the first node U01 stores the configuration information required for listening for the first DCI format; in response to receiving the first RRC message, start listening for the first DCI format.

[0449] As an ancillary embodiment of the above - mentioned sub - embodiment, the reception of the first RRC message means that the first RRC message is received at the physical layer.

[0450] As an ancillary embodiment of the above - mentioned sub - embodiment, the reception of the first RRC message means that the first RRC message is received at the physical layer and decoded and then passed to a higher layer.

[0451] As an ancillary embodiment of the above - mentioned sub - embodiment, the higher layer refers to the MAC sub - layer.

[0452] As an ancillary embodiment of the above - mentioned sub - embodiment, the higher layer refers to the RRC sub - layer.

[0453] As a sub - embodiment of the above - mentioned embodiment, listening for the first DCI format depends on the first RRC message being applied.

[0454] As a sub - embodiment of the above - mentioned embodiment, in response to the first RRC message being applied, listen for the first DCI format.

[0455] As an ancillary embodiment of the above - mentioned sub - embodiment, when the first RRC message is applied, listen for the first DCI format.

[0456] As an ancillary embodiment of the above - mentioned sub - embodiment, when at least the first RRC message is applied, listen for the first DCI format.

[0457] As a sub - embodiment of the above - mentioned embodiment, listening for the first DCI format does not depend on the first RRC message being received.

[0458] As a sub - embodiment of the above - mentioned embodiment, the first node periodically monitors the first DCI format.

[0459] As a sub - embodiment of the above - mentioned embodiment, when the trigger condition is met, the first node monitors the first DCI format.

[0460] As an embodiment, the dotted - line box F5.2 is optional.

[0461] As an embodiment, the dotted - line box F5.2 exists.

[0462] As an embodiment, the step S5104 exists.

[0463] As an embodiment, the first node monitors the first DCI format on one of the at least one candidate cells.

[0464] As an embodiment, the first node receives the first DCI format on one of the at least one candidate cells.

[0465] As an embodiment, the CRC of the first DCI format is scrambled by a RA - RNTI, and the calculation of the RA - RNTI depends on the time - frequency resources of the first Preamble.

[0466] As an embodiment, the first DCI format includes a timing - advance value on one of the at least one candidate cells.

[0467] As an embodiment, after the first Preamble is sent, the first node monitors the first DCI format on the receiving cell of the first Preamble, and the first node receives the first DCI format on the receiving cell of the first Preamble.

[0468] As an embodiment, the setting of the content in the first DCI format depends on the first Preamble.

[0469] As a sub - embodiment of the above - mentioned embodiment, when the first Preamble is received, it triggers the third node to set the first DCI format.

[0470] As a sub - embodiment of the above - mentioned embodiment, when the first Preamble is received, the third node starts to set the first DCI format.

[0471] As a sub - embodiment of the above - mentioned embodiment, when at least the first Preamble is received, the third node starts to set the first DCI format.

[0472] As a sub - embodiment of the above - mentioned embodiment, according to the information carried in the first Preamble, the third node sets the first DCI format.

[0473] As a sub - embodiment of the above - mentioned embodiment, the setting of the first DCI format includes: setting the first field, and the first field indicates whether the second field is included.

[0474] As a sub - embodiment of the above - mentioned embodiment, the setting of the first DCI format includes: setting the second field, and the timing advance value indicated in the second field is obtained according to the first Preamble.

[0475] As a sub - embodiment of the above - mentioned embodiment, the setting of the first DCI format includes: setting the reserved bits in the first DCI format.

[0476] As an embodiment, the dotted - line box F5.2 does not exist.

[0477] As an embodiment, the dotted - line box F5.3 is optional.

[0478] As an embodiment, the dotted - line box F5.3 exists.

[0479] As an embodiment, the third node N03 sends the first message.

[0480] As an embodiment, the first message is transmitted through a terrestrial interface.

[0481] As an embodiment, the first message is an XnAP message.

[0482] As an embodiment, the first message is an NGAP message.

[0483] As an embodiment, the first message includes information related to the first Preamble.

[0484] As an embodiment, the first message includes a field, and the field indicates the timing advance value of at least one candidate cell configured for the first RRC message.

[0485] As an embodiment, the first message includes partial information of the timing advance value of at least one candidate cell configured for the first RRC message.

[0486] As an embodiment, the second node N02 determines the timing advance value of at least one candidate cell configured for the first RRC message based on the first message.

[0487] As an embodiment, the second node N02 determines a timing advance value of at least one candidate cell configured for the first RRC message based on an uplink signal.

[0488] As an embodiment, the second node N02 determines a timing advance value of at least one candidate cell configured for the first RRC message based on the current connection state.

[0489] As an embodiment, the second node N02 determines a timing advance value of at least one candidate cell configured for the first RRC message based on implementation.

[0490] As an embodiment, the second node N02 determines a timing advance value of at least one candidate cell configured for the first RRC message based on an AI model.

[0491] As an embodiment, in response to receiving the first message, the second node N02 sets the first DCI format.

[0492] As an embodiment, when the first message is received, the second node N02 sets the first DCI format.

[0493] As an embodiment, when at least the first message is received, the second node N02 sets the first DCI format.

[0494] As an embodiment, the second node N02 sets the first DCI format according to the first message.

[0495] As an embodiment, the second node N02 sets at least part of the content of the first DCI format according to the first message.

[0496] As an embodiment, the step S5203 exists.

[0497] As an embodiment, the second node N02 sends the first DCI format.

[0498] As an embodiment, in response to receiving the first message, the second node N02 sends the first DCI format.

[0499] As an embodiment, in response to receiving the first message, after the second node sets the first DCI format, it sends the first DCI format.

[0500] As an embodiment, the first node listens for the first DCI format in the serving cell.

[0501] As an example, the first node monitors the first DCI format in the serving cell, and the CRC of the first DCI format is scrambled by a RA-RNTI.

[0502] As an example, the first node receives the first DCI format in the serving cell, the CRC of the first DCI format is scrambled by a RA-RNTI, and the calculation of the RA-RNTI depends on the time-frequency resources of the first preamble.

[0503] As an example, the first node receives the first DCI format in the serving cell, the CRC of the first DCI format is scrambled by a MsgB-RNTI, and the calculation of the MsgB-RNTI depends on the time-frequency resources of the first preamble.

[0504] As an example, the dotted box F5.3 does not exist.

[0505] As a sub-example of the above example, the second node sends the first DCI format without depending on the reception of the first message.

[0506] As a sub-example of the above example, the second node sends the first DCI format without depending on the first preamble.

[0507] As a sub-example of the above example, the second node sends the first DCI format, and the first DCI format indicates the timing advance value for at least one candidate cell configured for the first RRC message.

[0508] As an example, the first node monitors the first DCI format in the serving cell, and the CRC of the first DCI format is scrambled by the C-RNTI of the serving cell.

[0509] As an example, the first node receives the first DCI format in the serving cell, and the CRC of the first DCI format is scrambled by a C-RNTI.

[0510] As an example, the CRC of the first DCI format is scrambled by a C-RNTI, and the C-RNTI is the C-RNTI assigned to the first node in the serving cell.

[0511] As an example, the content of the first DCI format includes at least the second field, and the second field indicates the timing advance value for one of the at least one candidate cells configured for the first RRC message.

[0512] As an embodiment, the content of the first DCI format includes at least the first field and the second field.

[0513] As an embodiment, the content of the first DCI format includes at least a Cell indicator field, and the Cell indicator field indicates the cell identifier of the candidate cell corresponding to the timing advance value included in the second field.

[0514] As an embodiment, the content of the first DCI format includes at least the index of the first Preamble.

[0515] As an embodiment, the step S5203 does not exist.

[0516] As an embodiment, the step S5104 does not exist.

[0517] As an embodiment, the first node monitors the first DCI format, and the first node does not receive the first DCI format.

[0518] As an embodiment, the first node performs UE based TA.

[0519] As an embodiment, the first RRC message configures the first node to perform UE based TA.

[0520] Example 6

[0521] Embodiment 6 exemplifies a flowchart of triggering the start or restart of a first timer according to an embodiment of the present application, as shown in the appendix Figure 6 as follows.

[0522] In step S6101, a first DCI format is received, the first DCI format includes the second field, and the second field includes a timing advance value for the target cell; in step S6102, in response to the reception of the first DCI format, the first timer is started or restarted.

[0523] In Embodiment 6, the first timer controls the time of uplink time alignment of the target cell; having a valid timing advance value for the target cell depends on the first timer being running.

[0524] As an embodiment, the first DCI format includes a third field, and the third field includes the cell identifier for the target cell.

[0525] As an embodiment, the first DCI format includes a third field depending on the first DCI format including the second field.

[0526] As an embodiment, when the first DCI format includes the second field, and the second field includes a timing advance value for the target cell, the first DCI format includes a third field, and the third field includes a cell identifier for the target cell.

[0527] As an embodiment, when at least the first DCI format includes the second field, and the second field includes a timing advance value for the target cell, the first DCI format includes a third field, and the third field includes a cell identifier for the target cell.

[0528] As an embodiment, the receiving of the first DCI format means: receiving the first DCI format at the physical layer.

[0529] As an embodiment, the receiving of the first DCI format means: decoding the content carried by the first DCI format at the physical layer and delivering it to the MAC sublayer.

[0530] As an embodiment, the receiving of the first DCI format means: applying the content carried by the first DCI format at the MAC sublayer.

[0531] As an embodiment, the first node U01 starts or restarts a first timer.

[0532] As an embodiment, as a response to the reception of the first DCI format, if the first timer is not running, start the first timer.

[0533] As a sub - embodiment of the above - mentioned embodiment, "not running" means at expiry.

[0534] As a sub - embodiment of the above - mentioned embodiment, "not running" means stop.

[0535] As an embodiment, as a response to the reception of the first DCI format, if the first timer is running and the first timer has not expired, restart the first timer.

[0536] As an embodiment, as a response to the reception of the first DCI format, the physical layer of the first node sends an indication to a higher layer; as a response to the reception of the indication by the MAC sublayer of the first node, start or restart the first timer.

[0537] As an embodiment, as a response to the reception of the first DCI format, if the first timer expires, consider the timing advance value indicated in the first DCI for the target cell to be invalid.

[0538] As an example, as a response to receiving the first DCI format, if the first timer expires, it is considered that at least the uplink of the target cell indicated in the first DCI is out of synchronization.

[0539] As a sub - example of the above example, the first timer includes a timeAlignmentTimer.

[0540] As a sub - example of the above example, the first timer is a timeAlignmentTimer.

[0541] As a sub - example of the above example, the name of the first timer includes LTM.

[0542] As a sub - example of the above example, the name of the first timer includes timeAlignmentTimer.

[0543] As a sub - example of the above example, the first timer is for the TAG associated with the target cell.

[0544] As a sub - example of the above example, the first timer is for the PTAG associated with the target cell.

[0545] As a sub - example of the above example, the first timer is for at least one TAG associated with the target cell.

[0546] As an example, the value of the first timer is default.

[0547] As an example, the value of the first counter is configurable.

[0548] As an example, the value of the first counter is predefined.

[0549] As an example, the first DCI format indicates the configuration information of the first timer.

[0550] As an example, the first DCI format indicates at least the configuration information of the first timer.

[0551] As an example, the configuration information of the first timer includes the value of the first timer.

[0552] As an example, the configuration information of the first timer includes the start time of the first timer.

[0553] As an example, the configuration information of the first timer includes the start time and value of the first timer.

[0554] As an example, the first DCI format activates the configuration of the first timer, and the first node stores the configuration information of the first timer.

[0555] As an example, the first timer is configured by the first RRC message.

[0556] As an example, the value of the first timer is indicated by the first RRC message.

[0557] As an example, the start time of the first timer is indicated by the first RRC message.

[0558] As an example, the first RRC message configures at least one timer on at least one of the candidate cells, and the at least one timer includes the first timer.

[0559] As an example, the first RRC message configures the timers of each candidate cell that supports early uplink synchronization.

[0560] As an example, the maintenance of the timing advance value of one or more of the at least one candidate cells shares the first timer.

[0561] As an example, when the first timer is running, there is a valid timing advance value for the target cell.

[0562] As an example, when at least the first timer is running, there is a valid timing advance value for the target cell.

[0563] As an example, having a valid timing advance value for the target cell means that the first node considers the timing advance value carried in the first DCI format to be valid on the TAG associated with the target cell.

[0564] As an example, having a valid timing advance value for the target cell means that the first node applies the timing advance value carried in the first DCI format to the TAG associated with the target cell.

[0565] As an example, when the first timer is running and the measurement result for the reference signal meets the first threshold, there is a valid timing advance value for the target cell.

[0566] As a sub - embodiment of the above - mentioned embodiment, the measurement result for the reference signal refers to the difference between the RSRP value of the current down - link path loss reference signal and the RSRP value of the reference down - link path loss reference signal.

[0567] As a sub - embodiment of the above - mentioned embodiment, the measurement result for the reference signal refers to the difference between the measured value of the current specific down - link reference signal and the measured value of the reference specific down - link reference signal.

[0568] As a sub - embodiment of the above - mentioned embodiment, the measurement result for the reference signal refers to the measured value of the current specific down - link reference signal.

[0569] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is the SSB.

[0570] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is the CSI - RS.

[0571] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is the PRS.

[0572] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is at least one of the SSB, CSI - RS, and PRS.

[0573] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is configured by the first RRC message.

[0574] As a sub - embodiment of the above - mentioned embodiment, the specific down - link reference signal is indicated by the first DCI format.

[0575] As a sub - embodiment of the above - mentioned embodiment, the measured value is the L1 measured value.

[0576] As a sub - embodiment of the above - mentioned embodiment, the measured value is the L3 measured value.

[0577] As a sub - embodiment of the above - mentioned embodiment, the measured value is the L1 and L3 measured values.

[0578] As a sub - embodiment of the above - mentioned embodiment, the measured value is the RSRP.

[0579] As a sub - embodiment of the above - mentioned embodiment, the measured value is the RSRQ.

[0580] As a sub - embodiment of the above - mentioned embodiment, the measured value is the SINR.

[0581] As a sub - embodiment of the above - mentioned embodiment, the measured value is the RSSI.

[0582] As a sub - embodiment of the above - mentioned embodiment, the measured value is CQI.

[0583] As a sub - embodiment of the above - mentioned embodiment, the first threshold is pre - configured.

[0584] As a sub - embodiment of the above - mentioned embodiment, the first threshold is configured by the first RRC message.

[0585] As a sub - embodiment of the above - mentioned embodiment, the first threshold is indicated by the first DCI format.

[0586] As a sub - embodiment of the above - mentioned embodiment, the name of the first threshold includes "Threshold".

[0587] As a sub - embodiment of the above - mentioned embodiment, the name of the first threshold includes "ChangeThreshold".

[0588] As a sub - embodiment of the above - mentioned embodiment, the name of the first threshold includes "RSRP - ChangeThreshold".

[0589] As an embodiment, when the first timer is running and the second timer has not expired, there is a valid timing advance value for the target cell.

[0590] As a sub - embodiment of the above - mentioned embodiment, the second timer is for the validity of the first DCI format.

[0591] As a sub - embodiment of the above - mentioned embodiment, when the second timer expires, the first DCI format is invalid.

[0592] As a sub - embodiment of the above - mentioned embodiment, when the second timer expires, the first node considers the content included in the first DCI format invalid.

[0593] As a sub - embodiment of the above - mentioned embodiment, when at least the second timer expires, the first node considers the content included in the first DCI format invalid.

[0594] As an embodiment, as a response to successfully measuring TA by the first node's UE - based TA measurement, start or restart the first timer.

[0595] As a sub - embodiment of the above - mentioned embodiment, the first node's UE - based TA measurement is configured by the first RRC message.

[0596] As an example, in response to receiving a signaling, start or restart the first timer; the signaling includes a timing advance value for the target cell; the signaling is not the first DCI format.

[0597] As an example, in response to receiving an RRC layer signaling, start or restart the first timer, and the RRC signaling does not include a timing advance value for the target cell.

[0598] Example 7

[0599] Embodiment 7 exemplifies a schematic diagram of the first DCI format indicating at least one TCI state according to an embodiment of the present application, as shown in the appendix Figure 7 as shown.

[0600] In Embodiment 7, when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0601] As an example, as long as the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0602] As an example, when at least the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0603] As an example, when the first DCI format includes the second field, the first DCI format indicates at least one TCI state of at least one candidate cell.

[0604] As an example, when at least the first DCI format includes the second field, the first DCI format indicates at least one TCI state of at least one candidate cell.

[0605] As an example, as long as the first DCI format includes the second field, the first DCI format indicates at least one TCI state of at least one candidate cell.

[0606] As an example, when the first DCI format does not include the second field, the first DCI format does not indicate the TCI states of any candidate cells.

[0607] As an example, when at least the first DCI format does not include the second field, the first DCI format does not indicate the TCI states of any candidate cells.

[0608] As an embodiment, the first DCI format indicates that at least one TCI state does not depend on the second field included in the first DCI format.

[0609] As a sub - embodiment of the above - mentioned embodiment, when the first DCI format does not include the second field, the first DCI format indicates at least one TCI state.

[0610] As a sub - embodiment of the above - mentioned embodiment, when at least the first DCI format does not include the second field, the first DCI format indicates at least one TCI state.

[0611] As an embodiment, the first DCI format includes an index of the at least one TCI state.

[0612] As an embodiment, the first DCI format activates / de - activates the at least one TCI state.

[0613] As an embodiment, the first DCI format indicates and activates the at least one TCI state.

[0614] As an embodiment, at least 1 bit is occupied in the first DCI format to indicate the activation / de - activation of the at least one TCI state.

[0615] As an embodiment, the first DCI format includes at least one TCI state ID field.

[0616] As an embodiment, the first DCI format includes at least one UL TCI state ID field.

[0617] As an embodiment, the first DCI format includes at least one TCI state ID field and at least one UL TCI state ID field.

[0618] As an embodiment, all TCI state ID fields included in the first DCI format occupy M octets, and the non - negative integer M is related to the number of all TCI state IDs indicated.

[0619] As an embodiment, one TCI state ID field included in the first DCI format occupies 7 bits in each octet.

[0620] As an embodiment, one TCI state ID field included in the first DCI format occupies 7 bits.

[0621] As an example, the one TCI states ID field indicates at least one TCI state.

[0622] As an example, the one TCI states ID field indicates at least one TCI state of the at least one candidate cell configured by the first RRC message.

[0623] As an example, the TCI state indicated by the one TCI states ID field is indicated by the TCI-StateId identifier configured by RRC signaling.

[0624] As an example, the one TCI states ID field is a UL TCI states ID field.

[0625] As an example, the at least one TCI state is one TCI state.

[0626] As an example, the at least one TCI state is multiple TCI states.

[0627] As an example, at least one of the at least one TCI states is a UL TCI state.

[0628] As an example, at least one of the at least one TCI states is a Unified TCI State.

[0629] As an example, each TCI state of the at least one TCI states is either a UL TCI state or a Unified TCI State.

[0630] As an example, the first DCI format indicates the TCI state of each candidate cell in the at least one candidate cell.

[0631] As an example, the first DCI format indicates the TCI states of multiple candidate cells in the at least one candidate cell.

[0632] As an example, the first DCI format indicates multiple TCI states of multiple candidate cells in the at least one candidate cell.

[0633] As an example, the first DCI format indicates the TCI state of at least one of the at least one candidate cells.

[0634] As an embodiment, whether the first DCI format indicates the TCI state of a candidate cell among the at least one candidate cell depends on the configuration of the candidate cell.

[0635] As a sub - embodiment of the above - mentioned embodiment, the configuration of the candidate cell is an RRC layer configuration.

[0636] As a sub - embodiment of the above - mentioned embodiment, there is a field in the configuration of the candidate cell, the field is set to a specified value, and the first DCI format indicates the TCI state of a candidate cell among the at least one candidate cell.

[0637] As a sub - embodiment of the above - mentioned embodiment, there is a field in the configuration of the candidate cell, the field is set to setup, and the first DCI format indicates the TCI state of a candidate cell among the at least one candidate cell.

[0638] As a sub - embodiment of the above - mentioned embodiment, there is a field in the configuration of the candidate cell, the field is set to enable, and the first DCI format indicates the TCI state of a candidate cell among the at least one candidate cell.

[0639] As a sub - embodiment of the above - mentioned embodiment, there is a field in the configuration of the candidate cell, the field is set to enable, and a field in the first DCI format indicates the TCI state of a candidate cell among the at least one candidate cell.

[0640] As a sub - embodiment of the above - mentioned embodiment, there is a field in the configuration of the candidate cell, the field configures at least one TCI state Id, and the first DCI format indicates activating / de - activating at least one TCI state in the candidate cell.

[0641] Example 8

[0642] Embodiment 8 exemplifies the flowchart of triggering the monitoring of the first DCI format by the first Preamble according to an embodiment of the present application, as shown in the appendix Figure 8 as follows.

[0643] In Embodiment 8, sending the first Preamble on the target cell triggers the monitoring of the first DCI format.

[0644] As an embodiment, in response to sending the first Preamble on the target cell, the first DCI format is monitored.

[0645] As an embodiment, in response to sending the first preamble on the target cell, listen for the first DCI format on the target cell.

[0646] As an embodiment, in response to sending the first preamble on the target cell, listen for the first DCI format on the serving cell.

[0647] As an embodiment, sending the first preamble on the target cell means: selecting the first preamble.

[0648] As an embodiment, sending the first preamble on the target cell means: selecting an SSB, where the SSB is associated with the first preamble.

[0649] As an embodiment, sending the first preamble on the target cell means: selecting a PRACH occasion, where the PRACH occasion is associated with the first preamble.

[0650] As an embodiment, sending the first preamble on the target cell means: sending the first preamble to the target cell.

[0651] As an embodiment, sending the first preamble on the target cell means: re - sending the first preamble to the target cell.

[0652] As an embodiment, triggering the listening for the first DCI format means: triggering the opening of a first time window for listening for the first DCI format.

[0653] As a sub - embodiment of the above - mentioned embodiment, the opening time of the first time window depends on the configuration of the first RRC message.

[0654] As a sub - embodiment of the above - mentioned embodiment, the length of the first time window depends on the configuration of the first RRC message.

[0655] As a sub - embodiment of the above - mentioned embodiment, when the first time window expires, stop listening for the first DCI format.

[0656] As a sub - embodiment of the above - mentioned embodiment, when the first time window expires, re - send the first preamble.

[0657] As a sub - embodiment of the above - mentioned embodiment, when the first time window expires, stop sending the first preamble.

[0658] As an embodiment, triggering the monitoring of the first DCI format means: triggering the monitoring of the first DCI format on specified time-frequency resources.

[0659] As a sub-embodiment of the above embodiment, the specified time-frequency resources depend on the configuration of the first RRC message.

[0660] As a sub-embodiment of the above embodiment, the specified time-frequency resources depend on the configuration of an RRC message other than the first RRC message.

[0661] As an embodiment, triggering the monitoring of the first DCI format means: monitoring the first DCI format using the first RNTI.

[0662] As an embodiment, the random access procedure to which the first preamble belongs is triggered by a PDCCH order.

[0663] As an embodiment, the first preamble is indicated by a PDCCH order.

[0664] As an embodiment, the random access procedure to which the first preamble belongs is triggered by a MAC CE, and the MAC CE is an LTM Cell switch.

[0665] As an embodiment, the first preamble is indicated by a MAC CE, and the MAC CE is an LTM Cell switch.

[0666] As an embodiment, the first preamble is dedicated to the first node.

[0667] As an embodiment, the random access procedure to which the first preamble belongs is triggered by the first node.

[0668] As an embodiment, the first preamble is selected by the first node.

[0669] Example 9

[0670] Embodiment 9 exemplifies a schematic diagram of the first RRC message including the first information block according to an embodiment of the present application, as shown in the appendix Figure 9 as follows.

[0671] In Embodiment 9, the monitoring of the first DCI format depends on the first RRC message including the first information block.

[0672] As an example, under the assumption that the first RRC message does not include the first information block, the first preamble is not sent on the target cell.

[0673] As an example, under the assumption that the first RRC message does not include the first information block, the random access procedure including monitoring the first DCI format is not performed.

[0674] As an example, under the assumption that the first RRC message does not include the first information block, as a response to sending the first preamble on the target cell, the first DCI format is not monitored.

[0675] As an example, under the assumption that the first RRC message does not include the first information block, as a response to sending the first preamble on the target cell, it is considered that the random access procedure to which the first preamble belongs is successfully completed.

[0676] As a sub - example of the above - mentioned example, the statement that it is considered that the random access procedure to which the first preamble belongs is successfully completed means: no re - transmission of a preamble is performed.

[0677] As a sub - example of the above - mentioned example, the statement that it is considered that the random access procedure to which the first preamble belongs is successfully completed means: no monitoring of the DCI after the first preamble is sent.

[0678] As a sub - example of the above - mentioned example, the statement that it is considered that the random access procedure to which the first preamble belongs is successfully completed means: resetting the MAC entity for the random access procedure.

[0679] As an example, the statement that monitoring the first DCI format depends on the first RRC message including the first information block means: monitoring the first DCI format according to the indication of the first information block of the first RRC message.

[0680] As an example, the statement that monitoring the first DCI format depends on the first RRC message including the first information block means: monitoring the first DCI format only when the first RRC message includes the first information block.

[0681] As an example, the statement that monitoring the first DCI format depends on the first RRC message including the first information block means: monitoring the first DCI format when at least the first RRC message includes the first information block.

[0682] As a sub - embodiment of the above - mentioned embodiment, when the first RRC message includes the first information block and meets at least one of the first set of conditions, monitor the first DCI format.

[0683] As a sub - embodiment of the above - mentioned embodiment, the first set of conditions includes a first condition, and the first condition means that the first node is configured to perform UE - based TA measurement.

[0684] As a sub - embodiment of the above - mentioned embodiment, the first set of conditions includes a first condition, and the first condition means that the first node is not configured to perform UE - based TA measurement.

[0685] As a sub - embodiment of the above - mentioned embodiment, the first set of conditions includes a second condition, and the second condition means that the first node is configured to perform a cell handover without random access.

[0686] As a sub - embodiment of the above - mentioned embodiment, the first set of conditions includes a third condition, and the third condition means that the first time window opened after the first Preamble is sent has not expired.

[0687] As an embodiment, the monitoring of the first DCI format depends on the first RRC message including the first information block means that: as long as the first RRC message includes the first information block, monitor the first DCI format.

[0688] As an embodiment, the monitoring of the first DCI format depends on the first RRC message including the first information block means that: if the first RRC message does not include the first information block, do not monitor the first DCI format. As an embodiment, the first information block of the first RRC message indicates the monitoring of the first DCI format.

[0689] As an embodiment, the first information block of the first RRC message explicitly indicates the monitoring of the first DCI format.

[0690] As an embodiment, the first information block of the first RRC message is set to true.

[0691] As an embodiment, the first information block of the first RRC message is set to setup.

[0692] As an embodiment, the first information block of the first RRC message is set to supported.

[0693] As an embodiment, the first information block of the first RRC message implicitly indicates the monitoring of the first DCI format.

[0694] As an embodiment, the first information block of the first RRC message is configured to indicate listening for the first DCI format.

[0695] As an embodiment, the presence of the first information block of the first RRC message indicates listening for the first DCI format.

[0696] As an embodiment, the first information block of the first RRC message is configured for listening for the first DCI format.

[0697] As an embodiment, the first information block of the first RRC message includes the configuration information required for listening for the first DCI format.

[0698] As an embodiment, the first RRC message includes the first information block means that the first information block in the first RRC message is configured.

[0699] As an embodiment, the first RRC message includes the first information block means that the part of the first RRC message includes the first information block.

[0700] As an embodiment, the first RRC message includes the first information block means that the whole of the first RRC message includes the first information block.

[0701] As an embodiment, the first information block is configured to listen for at least the first DCI format.

[0702] As an embodiment, the first information block indicates the first time window.

[0703] As a sub - embodiment of the above - mentioned embodiment, the first information block indicates the length of the first time window.

[0704] As a sub - embodiment of the above - mentioned embodiment, the first information block indicates the start time of the first time window.

[0705] As a sub - embodiment of the above - mentioned embodiment, the first node listens for the first DCI format within the first time window.

[0706] As a sub - embodiment of the above - mentioned embodiment, the first node listens for the first DCI format after the first time window expires.

[0707] As a sub - embodiment of the above - mentioned embodiment, the first information block includes ra - ResponseWindow, the first time window is the RAR window, and the CRC of the first DCI format is scrambled by RA - RNTI.

[0708] Example 10

[0709] Embodiment 10 exemplifies a schematic diagram in which a first information block according to an embodiment of the present application indicates the time-frequency resources for monitoring the first DCI format on the target cell, as shown in the attached Figure 10 figure.

[0710] In Embodiment 10, the first information block indicates the time-frequency resources for monitoring the first DCI format on the target cell.

[0711] As an embodiment, the first information block indicates at least one search space for monitoring the first DCI format on the target cell.

[0712] As an embodiment, the at least one search space is a CSS.

[0713] As an embodiment, the at least one search space is a Type1-PDCCH CSS set.

[0714] As a sub-embodiment of the above embodiment, the at least one search space is a Type1-PDCCH CSS set, and the CRC of the first DCI format is scrambled by a RA-RNTI.

[0715] As a sub-embodiment of the above embodiment, the at least one search space is a Type1-PDCCH CSS set, and the CRC of the first DCI format is scrambled by a MsgB-RNTI.

[0716] As an embodiment, the at least one search space is a search space other than the Type1-PDCCH CSS set.

[0717] As an embodiment, the at least one search space is dedicated to the first DCI format.

[0718] As an embodiment, the at least one search space is a Type1B-PDCCH CSS set.

[0719] As an embodiment, the at least one search space is a USS.

[0720] As a sub-embodiment of the above embodiment, the at least one search space is a USS, and the CRC of the first DCI format is scrambled by a C-RNTI.

[0721] As a sub-embodiment of the above embodiment, the at least one search space is a USS, and the first DCI format is a PDCCH order.

[0722] As an example, the first information block indicates at least one CORESET for monitoring the first DCI format on the target cell.

[0723] As an example, the at least one CORESET is CORESET0.

[0724] As an example, the at least one CORESET is a CORESET other than CORESET0.

[0725] As an example, the first information block indicates at least one search space and at least one CORESET for monitoring the first DCI format on the target cell, and the at least one CORESET is associated with the at least one search space.

[0726] As an example, the first information block indicates a scheduling period for monitoring the first DCI format on the target cell.

[0727] As an example, the first information block indicates the CCE aggregation level of the first DCI format.

[0728] As an example, the first information block indicates the number of times for monitoring the first DCI format on the target cell.

[0729] As an example, the first information block indicates the starting symbol in the time domain for monitoring the first DCI format on the target cell.

[0730] As an example, the first information block indicates the frequency domain offset for monitoring the first DCI format on the target cell.

[0731] Example 11

[0732] Example 11 exemplifies a transmission flowchart of another wireless signal according to an embodiment of the present application, as shown in the appendix Figure 11 as shown.

[0733] For First Node U01 , in step S11101, a second DCI is received; in step S11102, a target cell is determined; in step S11103, a first Preamble is sent.

[0734] For Second Node N02 , in step S11201, a second DCI is sent.

[0735] For Third Node N03 , in step S11301, a first Preamble is received.

[0736] In Embodiment 11, the second DCI indicates the target cell and the first Preamble.

[0737] As an embodiment, the second node is the serving cell's maintaining base station.

[0738] As an embodiment, the third node is the target cell's maintaining base station.

[0739] As an embodiment, the third node is at least the target cell's maintaining base station.

[0740] As an embodiment, the second node and the third node are the same.

[0741] As an embodiment, the first node receives the second DCI.

[0742] As a sub - embodiment of the above - mentioned embodiment, the second DCI is a PDCCH order; the second DCI is received on the serving cell.

[0743] As a sub - embodiment of the above - mentioned embodiment, the second DCI is received after the first RRC message is received.

[0744] As a sub - embodiment of the above - mentioned embodiment, the second DCI is received independently of the reception of the first RRC message.

[0745] As a sub - embodiment of the above - mentioned embodiment, the second DCI triggers a random access procedure.

[0746] As a sub - embodiment of the above - mentioned embodiment, the random access procedure triggered by the second DCI is considered to be successfully completed when the first Preamble confirmation is successfully sent.

[0747] As a sub - embodiment of the above - mentioned embodiment, the random access procedure triggered by the second DCI is considered to be successfully completed when the first DCI format confirmation is successfully received.

[0748] As an embodiment, the first node determines the target cell.

[0749] As a sub - embodiment of the above - mentioned embodiment, the first node determines the target cell depending on the reception of the second DCI.

[0750] As a sub - embodiment of the above - mentioned embodiment, the reception of the second DCI triggers the first node to determine the target cell.

[0751] As a sub - embodiment of the above - mentioned embodiment, the second DCI instructs the first node to determine the target cell.

[0752] As a sub - embodiment of the above - mentioned embodiment, the second DCI only instructs the target cell.

[0753] As a sub - embodiment of the above - mentioned embodiment, the second DCI instructs a plurality of cells including the target cell.

[0754] As a sub - embodiment of the above - mentioned embodiment, the second DCI includes the cell identifier of the target cell.

[0755] As a sub - embodiment of the above - mentioned embodiment, the target cell is one of the at least one candidate cell.

[0756] As a sub - embodiment of the above - mentioned embodiment, the target cell is a cell outside the at least one candidate cell.

[0757] As a sub - embodiment of the above - mentioned embodiment, the second DCI instructs a first index, and the first index is associated with the target cell.

[0758] As a sub - embodiment of the above - mentioned embodiment, the second DCI does not instruct the target cell.

[0759] As an embodiment, the first node transmits the first Preamble.

[0760] As a sub - embodiment of the above - mentioned embodiment, in response to the reception of the second DCI, the first Preamble is transmitted on the target cell.

[0761] As a sub - embodiment of the above - mentioned embodiment, when the second DCI is received, the first Preamble is transmitted on the target cell.

[0762] As a sub - embodiment of the above - mentioned embodiment, when at least the second DCI is received, the first Preamble is transmitted on the target cell.

[0763] As a sub - embodiment of the above - mentioned embodiment, the reception of the second DCI triggers the transmission of the first Preamble on the target cell.

[0764] As a sub - embodiment of the above - mentioned embodiment, the second DCI instructs to transmit the first Preamble on the target cell.

[0765] As a sub - embodiment of the above - mentioned embodiment, the second DCI instructs to transmit the first Preamble at least on the target cell.

[0766] As a sub - embodiment of the above - mentioned embodiment, the second DCI indicates the cell identifier of the target cell, and the DCI indicates the index of the first Preamble.

[0767] As a sub - embodiment of the above - mentioned embodiment, the second DCI indicates the SS / PBCH index and the PRACH occasion index associated with the first Preamble.

[0768] As a sub - embodiment of the above - mentioned embodiment, the second DCI indicates initiating a random access procedure.

[0769] As a sub - embodiment of the above - mentioned embodiment, the random access procedure is CFRA, and the first Preamble and the target cell are indicated by the second DCI.

[0770] As a sub - embodiment of the above - mentioned embodiment, the random access procedure is CBRA, and the first node selects the first Preamble and the target cell.

[0771] As a sub - embodiment of the above - mentioned embodiment, when the first Preamble is indicated by the second DCI, the first DCI format includes the timing advance value of the target cell.

[0772] As a sub - embodiment of the above - mentioned embodiment, when the first Preamble is indicated by the second DCI and the first Preamble is sent to the target cell, the first DCI format includes the timing advance value of the target cell.

[0773] As a sub - embodiment of the above - mentioned embodiment, the reception of the first Preamble triggers the first DCI format to include the timing advance value of the target cell.

[0774] As a sub - embodiment of the above - mentioned embodiment, the reception of the first Preamble triggers the transmission of the first DCI format.

[0775] As a sub - embodiment of the above - mentioned embodiment, in response to receiving the first Preamble on the target cell, the target cell sends the first DCI format, and the first DCI format is scrambled by the RA - RNTI, and the calculation of the RA - RNTI is determined according to the time - frequency resources of the first Preamble.

[0776] As a sub - embodiment of the above - mentioned embodiment, in response to receiving the first Preamble on the target cell, the first DCI format is transmitted on the serving cell, and the first DCI format is scrambled by the RA - RNTI, and the calculation of the RA - RNTI is determined according to the time - frequency resources of the first Preamble.

[0777] As a sub - embodiment of the above - mentioned embodiment, in response to receiving the first Preamble on the target cell, the first DCI format is transmitted on the serving cell, and the first DCI format is scrambled by the C - RNTI.

[0778] Example 12

[0779] Embodiment 12 exemplifies a flowchart for determining the first Preamble according to a measurement of a reference signal associated with the first Preamble according to an embodiment of the present application, as shown in the appendix Figure 12 as follows.

[0780] In Embodiment 12, before transmitting the first Preamble on the target cell, the first Preamble is determined; wherein, the determination of the first Preamble depends on the measurement of the first reference signal associated with the first Preamble.

[0781] As an embodiment, before transmitting the first Preamble on the target cell means before the first node initiates a random access procedure.

[0782] As an embodiment, before transmitting the first Preamble on the target cell means before the first node is triggered to initiate a random access procedure.

[0783] As an embodiment, before transmitting the first Preamble on the target cell means before the first node is instructed to initiate a random access procedure.

[0784] As an embodiment, no signaling instructing to transmit the first Preamble is received before transmitting the first Preamble on the target cell.

[0785] As an embodiment, no signaling instructing to transmit the first Preamble is received before the first node initiates a random access procedure.

[0786] As an embodiment, the determination of the first Preamble means: determining the index of the first Preamble.

[0787] As an embodiment, the determination of the first Preamble means: determining the PRACH occasion associated with the first Preamble.

[0788] As an embodiment, the determination of the first Preamble means: determining the time-frequency resources of the PRACH occasion associated with the first Preamble.

[0789] As an embodiment, the determination of the first Preamble means: determining a first reference signal.

[0790] As an embodiment, the determination of the first Preamble depending on the measurement of the first reference signal associated with the first Preamble means: when the measurement of the first reference signal satisfies a first threshold, determining the first Preamble.

[0791] As an embodiment, the determination of the first Preamble depending on the measurement of the reference signal associated with the first Preamble means: when the measurement of at least the first reference signal satisfies a first threshold, determining the first Preamble.

[0792] As an embodiment, the determination of the first Preamble depending on the measurement of the reference signal associated with the first Preamble means: when the measurement of the first reference signal satisfies a first threshold and the reference signal associated with the first Preamble is selected, determining the first Preamble.

[0793] As an embodiment, the determination of the first Preamble depending on the measurement of the reference signal associated with the first Preamble means: when the measurement of the first reference signal satisfies a first threshold and the reference signal associated with the first Preamble is selected, determining the first Preamble.

[0794] As an embodiment, the first threshold is pre-configured.

[0795] As an embodiment, the first threshold is configured by the first RRC message.

[0796] As an embodiment, the first reference signal is an SSB.

[0797] As an embodiment, the measurement of the first reference signal is SS-RSRP.

[0798] As an embodiment, the first reference signal is a CSI-RS.

[0799] As an example, the measurement of the first reference signal is CSI-RSRP.

[0800] As an example, the first reference signal is a PRS.

[0801] As an example, the first reference signal is a reference signal other than CSI-RS and SSB.

[0802] As an example, the first reference signal is a communication perception integrated signal.

[0803] As an example, the first reference signal is a perception signal.

[0804] As an example, the first reference signal is available.

[0805] As an example, a reference signal for quasi co-location of the first reference signal is selected, and the reference signal for quasi co-location is not associated with a valid Preamble.

[0806] As an example, the first reference signal is selected from the reference signals that meet the first threshold, and the first reference signal is the reference signal associated with the first Preamble.

[0807] As a sub-example of the above example, the reference signal that meets the first threshold is pre-configured.

[0808] As a sub-example of the above example, the reference signal that meets the first threshold is not pre-configured.

[0809] As an example, when the first Preamble is determined by the first node, the first DCI format includes the timing advance value of the target cell.

[0810] As an example, when at least the first Preamble is determined by the first node, the first DCI format includes the timing advance value of the target cell.

[0811] As an example, when the first Preamble is not determined by the first node, the first DCI format does not include the timing advance value of the target cell.

[0812] As an example, the index of the first Preamble is explicitly indicated by the first signaling.

[0813] As a sub-example of the above example, the first signaling is a PDCCH.

[0814] As a sub - embodiment of the above - mentioned embodiment, the first signaling is an LTM Cell Switch Command MAC CE.

[0815] As a sub - embodiment of the above - mentioned embodiment, the index of the first Preamble is not 0b000000.

[0816] As a sub - embodiment of the above - mentioned embodiment, the first signaling indicates a first reference signal.

[0817] As a sub - embodiment of the above - mentioned embodiment, the first Preamble is sent depending on the availability of the first reference signal.

[0818] As an embodiment, when the first Preamble is signaled, the first DCI format includes the timing advance value of the target cell.

[0819] Example 13

[0820] Embodiment 13 illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application; as shown in the appendix Figure 12 shown. In the appendix Figure 13 shown, the processing device 1300 in the first node includes a first receiver 1301, a first processor 1302, and a first transmitter 1303.

[0821] The first receiver 1301 receives a first RRC message, the first RRC message configuring at least one candidate cell; monitors a first DCI format, the first DCI format including a first field;

[0822] In Embodiment 13, the first field indicates whether the first DCI format includes a second field, the second field indicating a timing advance value for at least one candidate cell configured for the first RRC message;

[0823] As an embodiment, the target cell is a candidate cell configured by the first RRC message, and the cell handover type for the target cell depends on whether there is an effective timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access and a cell handover without random access.

[0824] As an embodiment, the first receiver 1301 receives a first DCI format, the first DCI format including the second field, the second field including a timing advance value for the target cell;

[0825] As an example, the first processor 1302 starts or restarts a first timer in response to receiving the first DCI format;

[0826] As an example, the first timer controls the time for uplink timing alignment of the target cell; having a valid timing advance value for the target cell depends on the first timer being running.

[0827] As an example, when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0828] As an example, the first transmitter 1303 transmits a first Preamble on the target cell;

[0829] As an example, transmitting the first Preamble on the target cell triggers the monitoring of the first DCI format.

[0830] As an example, the monitoring of the first DCI format depends on the first RRC message including the first information block.

[0831] As an example, the first information block indicates the time-frequency resources for monitoring the first DCI format on the target cell.

[0832] As an example, the first receiver 1301 receives a second DCI before transmitting the first Preamble on the target cell;

[0833] As an example, the second DCI indicates the target cell and the first Preamble.

[0834] As an example, the first receiver 1301 determines the first Preamble before transmitting the first Preamble on the target cell;

[0835] As an example, the determination of the first Preamble depends on the measurement of the reference signal associated with the first Preamble.

[0836] As an example, the first processor 1302 includes the first receiver 1301.

[0837] As an example, the first processor 1302 includes the first transmitter 1303.

[0838] As an example, the first processor 1302 includes the first receiver 1301 and the first transmitter 1303.

[0839] As an embodiment, the first receiver 1301 includes the attached Figure 4 At least one of the antenna 452 or the receiver 454 or the multi-antenna receive processor 458 or the receive processor 456 or the controller / processor 459 or the memory 460 or the data source 467.

[0840] As an embodiment, the first receiver 1301 includes the attached Figure 4 At least an antenna 452 and a receiver 454.

[0841] As an embodiment, the first transmitter 1303 includes the attached Figure 4 At least one of the antenna 452 or transmitter 454 or multi-antenna transmit processor 457 or transmit processor 468 or controller / processor 459 or memory 460 or data source 467.

[0842] As an embodiment, the first transmitter 1303 includes the attached Figure 4 At least antenna 452 and transmitter 454.

[0843] Example 14

[0844] Example 14 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application; Figure 14 As shown in the attached Figure 14 In the embodiment, the processing device 1400 in the second node includes a second transmitter 1401.

[0845] The second transmitter 1401 sends a first RRC message, where the first RRC message configures at least one candidate cell; and sends a first DCI format, where the first DCI format includes a first field.

[0846] In embodiment 14, the first field indicates whether the first DCI format includes a second field, the second field indicates a timing advance value of at least one candidate cell configured for the first RRC message; the target cell is a candidate cell configured by the first RRC message, and the cell switching type initiated by the recipient of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell switching type is one of a cell switching based on random access or a cell switching without random access.

[0847] As an example, in response to receiving the first DCI format, the receiver of the first DCI format starts or restarts a first timer; the first timer controls the time for uplink time alignment of the target cell; having a valid timing advance value for the target cell depends on the first timer being running.

[0848] As an example, when the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

[0849] As an example, the receiver of the first RRC message sends a first preamble to the target cell, and sending the first preamble on the target cell triggers the receiver of the first RRC message to listen for the first DCI format.

[0850] As an example, the receiver of the first RRC message listens for the first DCI format depending on the first RRC message including the first information block.

[0851] As an example, the first information block indicates the time-frequency resources for listening for the first DCI format on the target cell.

[0852] As an example, a second transmitter 1401 sends the second DCI before the receiver of the first RRC message sends the first preamble on the target cell.

[0853] As an example, the second DCI indicates the target cell and the first preamble.

[0854] As an example, the determination of the first preamble depends on the measurement of the reference signal associated with the first preamble.

[0855] As an example, the second transmitter 1401 includes at least one of the antenna 420 or the transmitter 418 or the multi-antenna transmission processor 471 or the transmission processor 416 or the controller / processor 475 or the memory 476 attached to this application Figure 4 in the appendix.

[0856] As an example, the second transmitter 1401 includes at least the antenna 420 and the transmitter 418 attached to this application Figure 4 in the appendix.

[0857] Example 15

[0858] Embodiment 15 exemplifies a structural block diagram of a processing device in a third node; as shown in the appendix Figure 15 as follows. In the appendix Figure 15 shown, the processing device 1500 in the third node includes a third processor 1501.

[0859] The third processor 1501 receives a first Preamble; and transmits the first DCI format, where the first DCI format includes a first field;

[0860] In Embodiment 15, the reception of the first Preamble triggers the transmission of the first DCI format; the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell.

[0861] As an embodiment, the target cell is one of the at least one candidate cells, and the type of cell handover initiated by the sender of the first Preamble for the target cell depends on whether there is a valid timing advance value for the target cell. The type of cell handover is one of a cell handover based on random access or a cell handover without random access.

[0862] As an embodiment, the third processor 1501 includes a third receiver.

[0863] As an embodiment, the third processor 1501 includes a third transmitter.

[0864] As an embodiment, the third processor 1501 includes a third receiver and a third transmitter.

[0865] As an embodiment, the third receiver includes at least one of antenna 452 or receiver 454 or multi-antenna reception processor 458 or reception processor 456 or controller / processor 459 or memory 460 or data source 467 in the appendix of this application Figure 4 shown.

[0866] As an embodiment, the third receiver includes at least antenna 452 and receiver 454 in the appendix of this application Figure 4 shown.

[0867] As an embodiment, the third transmitter includes at least one of antenna 452 or transmitter 454 or multi-antenna transmission processor 457 or transmission processor 468 or controller / processor 459 or memory 460 or data source 467 in the appendix of this application Figure 4 shown.

[0868] As an embodiment, the third transmitter includes at least antenna 452 and transmitter 454 in the appendix of this applicationFigure 4 At least antenna 452 and transmitter 454 in

[0869] Those of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk, or an optical disc, etc. Optionally, all or part of the steps of the above embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above embodiments can be implemented in a hardware form or in the form of a software function module. This application is not limited to any specific form of the combination of software and hardware. The user equipment, terminal, and UE in this 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 this application includes, but is not limited to, macrocell base stations, microcell base stations, home base stations, relay base stations, gNB (NR Node B) NR Node B, TRP (Transmitter Receiver Point), and other wireless communication devices.

[0870] As described above, the above are only the preferred embodiments of this application and are not used to limit the protection scope of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A first node used for wireless communication, characterized in that, Comprising: A first receiver that receives a first RRC message, the first RRC message configuring at least one candidate cell; Monitoring a first DCI format, the first DCI format including a first field; Wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured for the first RRC message; A target cell is one of the candidate cells configured by the first RRC message, and the cell handover type for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access or a cell handover without random access.

2. The first node according to claim 1, characterized in that, Comprising: The first receiver that receives a first DCI format, the first DCI format including the second field, and the second field including a timing advance value for the target cell; A first processor that starts or restarts a first timer in response to the first DCI format being received; Wherein, the first timer controls the time for uplink time alignment of the target cell; Having a valid timing advance value for the target cell depends on the first timer being running.

3. The first node according to claim 1 or 2, characterized in that When the first DCI format includes the second field, the first DCI format indicates at least one TCI state.

4. The first node according to any one of claims 1 to 3, characterized in that Comprising: A first transmitter that transmits a first preamble on the target cell; Wherein, transmitting the first preamble on the target cell triggers the monitoring of the first DCI format.

5. The first node according to claim 4, characterized in that, The monitoring of the first DCI format depends on the first RRC message including a first information block.

6. The first node according to claim 5, wherein The first information block indicates the time-frequency resources for monitoring the first DCI format on the target cell.

7. The first node according to any one of claims 4 to 6, characterized in that, Comprising: The first receiver that receives a second DCI before transmitting the first preamble on the target cell; Wherein, the second DCI indicates the target cell and the first preamble.

8. The first node according to any one of claims 4 to 6, characterized in that, Comprising: The first receiver that determines the first preamble before transmitting the first preamble on the target cell; Wherein, the determination of the first preamble depends on the measurement of the reference signal associated with the first preamble.

9. A second node used for wireless communication, characterized in that, Comprising: A second transmitter that transmits a first RRC message, the first RRC message configuring at least one candidate cell; Transmitting a first DCI format, the first DCI format including a first field; Wherein, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured for the first RRC message; A target cell is one of the candidate cells configured by the first RRC message, and the cell handover type initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the cell handover type is one of a cell handover based on random access or a cell handover without random access.

10. A third node used for wireless communication, characterized in that, Comprising: A third processor that receives a first Preamble; Transmits a first DCI format, where the first DCI format includes a first field; Among them, the reception of the first Preamble triggers the transmission of the first DCI format; the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell; the target cell is one of the at least one candidate cells, and the type of cell handover initiated by the sender of the first Preamble for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access or a cell handover without random access.

11. A method for a first node used in wireless communication, characterized in that, Comprises: Receives a first RRC message that configures at least one candidate cell; Monitors a first DCI format, where the first DCI format includes a first field; Among them, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured by the first RRC message; The target cell is one of the candidate cells configured by the first RRC message, and the type of cell handover for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access or a cell handover without random access.

12. A method for a second node used in wireless communication, characterized in that, Comprises: Transmits a first RRC message that configures at least one candidate cell; Transmits a first DCI format, where the first DCI format includes a first field; Among them, the first field indicates whether the first DCI format includes a second field, and the second field indicates a timing advance value for at least one candidate cell configured by the first RRC message; The target cell is one of the candidate cells configured by the first RRC message, and the type of cell handover initiated by the receiver of the first RRC message for the target cell depends on whether there is a valid timing advance value for the target cell, and the type of cell handover is one of a cell handover based on random access or a cell handover without random access.

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