Method and device for supporting cell switching in wireless communication

Abstract

The invention discloses a method and a device for supporting cell switching in wireless communication. A first node receives a first RRC signaling and evaluates whether a first condition set for a second cell is satisfied, the first RRC signaling indicates the second cell and a configuration of the second cell, and the second cell is a switching candidate cell; when the first condition set of the second cell is satisfied, starting to apply at least part of the configurations of the second cell, and triggering to monitor a first timing advance command on the second cell, the first timing advance command being an MAC sublayer message; wherein the first condition set comprises that the channel quality of a first cell is poorer than a first threshold value, and the first cell is a service cell of the first node; the time alignment timer associated with the timing advance group to which the second cell belongs is not running. According to the invention, rapid cell switching can be realized.

Description

Technical Field

[0001] The present application relates to a method and apparatus in a wireless communication system, and more particularly to a method and apparatus for supporting uplink synchronization when cell switching is performed in wireless communication. Background Art

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

[0003] In the new air interface technology, cell switching provides effective mobility support. The basic requirement of cell switching is to reduce the switching delay and reduce the impact on delay-sensitive services. Uplink synchronization is one of the basic requirements of wireless communication. In order to adapt to various application scenarios and meet different needs, 3GPP has been evolving uplink synchronization technology. Summary of the invention

[0004] When a UE (User Equipment) moves from the coverage of one cell to the coverage of another cell, it is necessary to change the UE's serving cell, i.e., switch from the source cell to the target cell. Existing cell switching is usually triggered by L3 (Layer 3) measurement and is implemented by RRC (Radio Resource Control) signaling, including reconfiguration with synchronization. Cell switching implemented at L3 has the characteristics of long delay and long service interruption time. To overcome the above shortcomings, 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) introduced Dual Connectivity (DC), Conditional PSCell (Primary SCG (Secondary Cell Group) Cell) change (CPC), Conditional PSCell Addition (CPA), Conditional Handover (CHO) and other technologies in Rel (version)-17, but these technologies are still based on L3 implementation and cannot completely solve the above problems. At the 3GPP RAN#94e plenary meeting, it was decided to start the WI (Work Item) standardization work on the cell switching technology based on L1 / L2 (Layer 1 / Layer 2). The design goal of the cell switching based on L1 / L2 is to achieve fast switching of UE serving cells.

[0005] Before UE performs uplink data communication, it must first obtain uplink synchronization, namely uplink time alignment. How to quickly obtain uplink synchronization during cell switching to achieve fast cell switching needs to be studied.

[0006] In response to the above problems, the present application discloses a solution. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Although the original intention of the present application is for the Uu air interface, the present application can also be used for the PC5 port. Furthermore, although the original intention of the present application is for the cell switching scenario, the present application is also applicable to other scenarios facing similar problems, including but not limited to multi-antenna systems, multi-TRP (Transmission Reception Point, sending and receiving nodes) systems, capacity enhancement systems, short-range communication systems, unlicensed frequency domain communications, IoT (Internet of Things, Internet of Things), URLLC (Ultra Reliable Low Latency Communication, ultra-robust low-latency communication) networks, vehicle networking communications, relay communications, dual-connectivity (dual-connectivity, DC), multi-connectivity (multi-connectivity, MC), etc., to achieve similar technical effects. In addition, the use of a unified solution for different scenarios (including but not limited to V2X scenarios and communication scenarios between terminals and base stations) also helps to reduce hardware complexity and costs. In particular, the interpretation of the terminology, nouns, functions, and variables in this application (unless otherwise specified) can refer to the definitions in the 3GPP specification protocols TS38 series and TS37 series.

[0007] The present application discloses a method in a first node used for wireless communication, characterized by comprising:

[0008] receiving a first RRC signaling, and evaluating whether a first condition set for the second cell is satisfied, the first RRC signaling indicating a second cell and a configuration of the second cell, the second cell being a handover candidate cell;

[0009] The first condition set for the second cell is met, at least part of the configuration of the second cell is started to be applied, and monitoring of a first timing advance command on the second cell is triggered, where the first timing advance command is a MAC sublayer message;

[0010] The first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; and the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0011] As an embodiment, the first cell is a source cell of cell switching.

[0012] As an embodiment, when the first condition set for the second cell is met, the second cell is a target cell for cell switching.

[0013] As an embodiment, the first RRC signaling includes cell switching configuration information.

[0014] As an embodiment, an evaluation result of whether the first condition set for the second cell is satisfied is used to determine whether to trigger a cell handover to the second cell.

[0015] As an embodiment, the above method can implement cell switching triggered by UE.

[0016] As an embodiment, the cell switching triggered by the UE can speed up the cell switching process and reduce the cell switching delay.

[0017] As an embodiment, the UE-triggered cell switching can omit the signaling of the network-triggered cell switching.

[0018] As an embodiment, the cell switching triggered by the UE is based on the result of UE measurement and evaluation, which can improve the robustness of the switching.

[0019] As an embodiment, the problem to be solved by the present application is: how to obtain uplink transmission timing in a cell switching triggered by a UE.

[0020] As an embodiment, the solution of the present application is: after evaluating that the first condition set for the second cell is satisfied, triggering monitoring of the first timing advance command (Timing Advance Command, TAC) on the second cell.

[0021] As an embodiment, the above method is applicable to cell switching triggered by UE.

[0022] As an embodiment, the above method is applicable to conditional LTM (L1 / L2-triggered mobility).

[0023] As an embodiment, in the above method, the first timing advance command is a MAC (Medium Access Control) sublayer message and can support backward compatibility.

[0024] As an embodiment, the first condition set for the second cell is met, and starting to apply at least part of the configuration of the second cell includes: before the first condition set for the second cell is met, starting to apply the remaining configuration of the configuration.

[0025] As an embodiment, in the prior art, the first condition set for the second cell is met, and all the configurations in the configuration of the second cell are applied, that is, the second cell becomes a serving cell; the present application starts to apply at least part of the configuration of the second cell, which can effectively support the application of the rest of the configuration before cell switching, and effectively support UE-triggered fast cell switching.

[0026] As an embodiment, the time alignment timer (TAT) associated with the timing advance group (TAG) to which the second cell belongs is not running, including: the first node has not yet obtained uplink synchronization with the second cell.

[0027] As an embodiment, the time alignment timer associated with the timing advance group to which the second cell belongs is not running, including: the first node has not yet obtained uplink time alignment with the second cell.

[0028] According to one aspect of the present application, the above method is characterized in that it also includes:

[0029] As an embodiment, monitoring the first timing advance command on the second cell includes monitoring PDSCH; wherein the time-frequency resource block occupied by the PDSCH is indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

[0030] As an embodiment, the above method obtains the first timing advance command by monitoring the PDSCH (Physical Downlink Shared CHannel) on the second cell.

[0031] As an embodiment, the configuration of the second cell included in the first RRC signaling includes the configuration of the first downlink allocation.

[0032] As an embodiment, the above method relies on the configuration of the first RRC signaling to monitor the first timing advance command, which can speed up the cell switching process.

[0033] As an embodiment, the above method relies on monitoring the PDSCH to obtain the first timing advance command, which can reduce the complexity of UE implementation and save UE power.

[0034] According to one aspect of the present application, the above method is characterized in that it also includes:

[0035] The first downlink allocation indicates a periodic time-frequency resource block.

[0036] As an embodiment, the above method can improve the robustness of UE receiving the first timing advance command.

[0037] As an embodiment, the above method can effectively save signaling.

[0038] According to one aspect of the present application, the above method is characterized in that it also includes:

[0039] The first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink transmission in any cell included in the timing advance group;

[0040] The uplink sending includes sending a first random access sequence, or the uplink sending includes sending a PUSCH on a time-frequency resource block indicated by the configuration grant.

[0041] As an embodiment, the time-frequency resource block indicated by the configuration grant is independent of the time-frequency resource block indicated by the PUSCH (Physical Uplink Shared Channel) occasion included in MsgA.

[0042] As an embodiment, in the prior art, before uplink time alignment with the second cell is achieved, the first node does not perform uplink transmission except for random access sequence transmission and MsgA (message A) transmission.

[0043] As an embodiment, the above method sends the PUSCH on the time-frequency resource block indicated by the configured grant (CG) before the uplink time alignment with the second cell is obtained, which is innovative.

[0044] As an embodiment, the above method can realize fast cell switching.

[0045] According to one aspect of the present application, the above method is characterized in that it also includes:

[0046] sending the first random access sequence as a response to receiving the first RRC signaling;

[0047] Among them, the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for sending the first random access sequence; the starting application of at least part of the configuration of the second cell includes: starting to apply the configuration of the second cell except the configuration for random access.

[0048] As an embodiment, the above method may support early uplink synchronization.

[0049] As an embodiment, before the first condition set for the second cell is satisfied, the configuration for random access included in the configuration of the second cell begins to be applied.

[0050] As an embodiment, the first condition set for the second cell is met, and the configuration of the second cell except the configuration for random access begins to be applied.

[0051] As an embodiment, the above method can realize RACH-less (no random access channel) cell switching by triggering the sending of the first random access sequence through the first RRC signaling.

[0052] As an embodiment, the above method can avoid the network from sending signaling again to trigger the sending of the first random access sequence, thereby achieving the beneficial effect of saving signaling and also improving signaling robustness.

[0053] According to one aspect of the present application, the above method is characterized in that it also includes:

[0054] Before the first set of conditions for the second cell is satisfied, the first timing advance command is monitored on the first cell.

[0055] As an embodiment, the above method may support early uplink synchronization.

[0056] As an embodiment, the above method can reduce UE complexity.

[0057] According to one aspect of the present application, the above method is characterized in that it also includes:

[0058] Monitoring the first timing advance command on the first cell includes monitoring a PDCCH; wherein a PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0059] As an embodiment, the above method can reduce UE complexity.

[0060] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0061] Sending a first RRC signaling, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, the second cell being a handover candidate cell; wherein whether a first condition set for the second cell is satisfied is evaluated; the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is applied, and is triggered to monitor a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; the first condition set includes that a channel quality of the first cell is worse than a first threshold, the first cell is maintained by the second node; and a time alignment timer associated with a timing advance group to which the second cell belongs is not running;

[0062] or,

[0063] A first timing advance command is sent on a second cell, wherein the first timing advance command is a MAC sublayer message; wherein a first RRC signaling is received, the first RRC signaling indicates the second cell and the configuration of the second cell, and the second cell is a switching candidate cell; whether a first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell is applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is used to send the first RRC signaling; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0064] As an embodiment, in the above method, the second node maintains the first cell, or the second node maintains the second cell.

[0065] According to one aspect of the present application, the above method is characterized in that it also includes:

[0066] Sending a first RRC signaling, where the first RRC signaling indicates a second cell and a configuration of the second cell, where the second cell is a handover candidate cell;

[0067] Sending a first timing advance command on the second cell, wherein the first timing advance command is a MAC sublayer message;

[0068] Among them, whether the first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell begins to be applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is maintained by the second node; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0069] As an embodiment, in the above method, the second node maintains the first cell and the second cell.

[0070] According to one aspect of the present application, the above method is characterized in that it also includes:

[0071] Sending the first timing advance command on the second cell includes sending a PDSCH; wherein the time-frequency resource blocks occupied by the PDSCH are indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

[0072] As an embodiment, the above method can achieve fast cell switching by actively sending the first timing advance command.

[0073] According to one aspect of the present application, the above method is characterized in that it also includes:

[0074] The first downlink allocation indicates a periodic time-frequency resource block.

[0075] According to one aspect of the present application, the above method is characterized in that it also includes:

[0076] The first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink reception in any cell included in the timing advance group;

[0077] The uplink reception includes receiving a first random access sequence, or the uplink reception includes receiving a PUSCH on a time-frequency resource block indicated by a configuration grant.

[0078] As an embodiment, the uplink reception in the above method is used to generate the first timing advance command.

[0079] According to one aspect of the present application, the above method is characterized in that it also includes:

[0080] receiving, in response to receiving the first RRC signaling, the first random access sequence;

[0081] Among them, the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for receiving the first random access sequence; the at least partial configuration of the second cell being applied includes: the configuration of the second cell except the configuration for random access is applied.

[0082] According to one aspect of the present application, the above method is characterized in that it also includes:

[0083] The first timing advance command is sent on the first cell before the first set of conditions for the second cell is met.

[0084] According to one aspect of the present application, the above method is characterized in that it also includes:

[0085] Sending the first timing advance command on the first cell includes sending a PDCCH; wherein a PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0086] The present application discloses a first node used for wireless communication, characterized in that it includes:

[0087] A first receiver receives a first RRC signaling, and evaluates whether a first condition set for the second cell is satisfied, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, and the second cell is a handover candidate cell;

[0088] The first receiver, when the first condition set for the second cell is satisfied, starts to apply at least part of the configuration of the second cell, and triggers monitoring of a first timing advance command on the second cell, where the first timing advance command is a MAC sublayer message;

[0089] The first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; and the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0090] The present application discloses a second node used for wireless communication, characterized in that it includes:

[0091] A second transmitter sends a first RRC signaling, where the first RRC signaling indicates a second cell and a configuration of the second cell, where the second cell is a handover candidate cell;

[0092] Wherein, whether a first condition set for the second cell is satisfied is evaluated; the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is applied, and is triggered to monitor a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; the first condition set includes that a channel quality of the first cell is worse than a first threshold, and the first cell is maintained by the second node; a time alignment timer associated with a timing advance group to which the second cell belongs is not running;

[0093] or,

[0094] A first transceiver sends a first timing advance command on a second cell, wherein the first timing advance command is a MAC sublayer message;

[0095] Among them, a first RRC signaling is received, the first RRC signaling indicates the second cell and the configuration of the second cell, and the second cell is a switching candidate cell; whether a first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell is applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is used to send the first RRC signaling; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0096] According to one aspect of the present application, the above method is characterized in that it also includes:

[0097] The second node includes the first transmitter and the second processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0098] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0099] Figure 1 A signal processing flow chart in a first node according to an embodiment of the present application is illustrated;

[0100] Figure 2 A schematic diagram illustrating a network architecture according to an embodiment of the present application is illustrated;

[0101] Figure 3 A schematic diagram illustrating a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0102] Figure 4 A hardware module schematic diagram of a communication device according to an embodiment of the present application is illustrated;

[0103] Figure 5 An example of a wireless signal transmission flow chart according to an embodiment of the present application is provided;

[0104] Figure 6 A schematic diagram of a time-frequency resource block indicating a first downlink allocation according to an embodiment of the present application is illustrated;

[0105] Figure 7 A schematic diagram illustrating the relationship between uplink transmission and a first timing advance command according to an embodiment of the present application is illustrated;

[0106] Figure 8 A schematic diagram illustrating monitoring a first timing advance command on a first cell and monitoring a first timing advance command on a second cell according to an embodiment of the present application is illustrated;

[0107] Fig. 9 An example structural block diagram of a processing device in a first node according to an embodiment of the present application is shown;

[0108] Fig.10 The structural block diagram of the processing device in the second node according to an embodiment of the present application is illustrated. DETAILED DESCRIPTION

[0109] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

[0110] Example 1

[0111] Embodiment 1 illustrates a signal processing flow chart in a first node according to an embodiment of the present application, as shown in the attached Figure 1 shown.

[0112] In embodiment 1, the first node 100 receives a first RRC signaling in step 101; evaluates whether a first condition set for the second cell is met in step 102; the first condition set for the second cell is met in step 103, and starts to apply at least part of the configuration of the second cell; triggers listening to a first timing advance command on the second cell in step 104; wherein the first RRC signaling indicates the configuration of the second cell and the second cell, and the second cell is a switching candidate cell; the first timing advance command is a MAC sublayer message; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0113] As an embodiment, a first RRC signaling is received on a serving cell of the first node.

[0114] As an embodiment, the service cell of the first node includes a SpCell (Special Cell).

[0115] As an embodiment, the service cell of the first node includes a PCell (Primary Cell).

[0116] As an embodiment, the service cell of the first node includes a SCell (secondary cell).

[0117] As an embodiment, the first RRC signaling is RRCReconfiguration (RRC reconfiguration).

[0118] As an embodiment, the first RRC signaling is LTMConfig (LTM configuration).

[0119] As an embodiment, the first RRC signaling includes ConditionalReconfiguration.

[0120] As an embodiment, the first RRC signaling includes condLTMConfig (conditional LTM configuration).

[0121] As an embodiment, the first RRC signaling includes condRRCReconfig (conditional RRC reconfiguration).

[0122] As an embodiment, the first RRC signaling includes ltm-ReferenceConfiguration (LTM reference configuration).

[0123] As an embodiment, the first RRC signaling includes LTM-Candidate.

[0124] As an embodiment, the first RRC signaling includes ltm-CandidateConfig (LTM candidate configuration).

[0125] As an embodiment, the name of the first RRC signaling includes cond (condition).

[0126] As an embodiment, the first RRC signaling indicates a second cell, and the second cell is a handover candidate cell.

[0127] As an embodiment, the second cell waits to become a service cell of the first node.

[0128] As an embodiment, the second cell is an SCell (secondary cell) of the first node.

[0129] As an embodiment, the second cell is configured according to the measurement report reported by the first node.

[0130] As an embodiment, the measurement report is a low-layer measurement report.

[0131] As an embodiment, the measurement report is an L1 (layer 1) measurement report.

[0132] As an embodiment, the handover candidate cell is used for lower layer cell handover.

[0133] As an embodiment, the handover candidate cell is used for LTM.

[0134] As an embodiment, the handover candidate cell is used for conditional LTM.

[0135] As an embodiment, the first RRC signaling includes an identifier of the second cell.

[0136] As an embodiment, the identifier of the second cell is PhysCellId (physical cell identifier).

[0137] As an embodiment, the identifier of the second cell is candidateCellID (candidate cell identifier).

[0138] As an embodiment, the first RRC signaling indicates the configuration of the second cell.

[0139] As a sub-embodiment of the above embodiment, the first RRC signaling includes a candidate identifier (candidate ID) to indicate the configuration of the second cell.

[0140] As an embodiment, the configuration of the second cell is applied to conditional switching.

[0141] As an embodiment, the configuration of the second cell is applied to conditional LTM.

[0142] As an embodiment, the configuration of the second cell includes a serving cell common configuration (ServingCellConfigCommon).

[0143] As an embodiment, the configuration of the second cell includes a dedicated random access configuration (rach-ConfigDedicated).

[0144] As an embodiment, the configuration of the second cell includes a new user identity (newUE-Identity).

[0145] As an embodiment, it is evaluated whether a first condition set for the second cell is satisfied.

[0146] As an embodiment, in response to receiving the first RRC signaling, an evaluation is started as to whether the first condition set for the second cell is met.

[0147] As an embodiment, the first set of conditions for the second cell is network configured.

[0148] As an embodiment, the first condition set includes at least one condition.

[0149] As an embodiment, whether the first condition set is satisfied means whether all conditions in the first condition set are satisfied.

[0150] As a sub-embodiment of the above embodiment, all conditions in the first condition set are met, and the first condition set is met.

[0151] As a sub-embodiment of the above embodiment, if any condition in the first condition set is not satisfied, the first condition set is not satisfied.

[0152] As an embodiment, the first condition set includes conditions for executing conditional switching.

[0153] As an embodiment, the first condition set includes conditions for executing conditional LTM.

[0154] As an embodiment, the first condition set includes an event for executing a conditional LTM.

[0155] As an embodiment, the evaluating whether the first condition set for the second cell is satisfied includes: performing channel measurement for the second cell and evaluating whether the first condition set is satisfied.

[0156] As an embodiment, the first RRC signaling indicates that the candidate configuration for the second cell includes a measurement configuration for the second cell.

[0157] As an embodiment, the measurement configuration for the second cell includes a measurement identifier (measurementID), and the first node performs measurement according to a measurement object (measurement object) indicated by the measurement identifier to determine whether the first condition set is met.

[0158] As an embodiment, the first condition set includes that the channel quality of the first cell is worse than a first threshold.

[0159] As an embodiment, the first cell is a service cell of the first node.

[0160] As an embodiment, the first cell is a source cell of cell switching.

[0161] As an embodiment, the first cell is a PCell.

[0162] As an embodiment, the first cell is a PSCell (Primary SCG (Secondary Cell Group) Cell, primary SCG cell).

[0163] As an embodiment, the first threshold is a measurement value.

[0164] As an embodiment, the first threshold is a configuration value.

[0165] As an embodiment, the first threshold is a value obtained by linearly processing a measurement value and an offset value, and the offset value is configurable.

[0166] As an embodiment, the first condition set includes one condition, and the one condition is that the channel quality of the first cell is worse than the first threshold; wherein the first threshold is the channel quality of the second cell.

[0167] As an embodiment, the first condition set includes a condition, wherein the channel quality of the first cell is worse than the first threshold; wherein the first threshold is the difference between the channel quality of the second cell and an offset value, and the offset value is configured.

[0168] As an embodiment, the first condition set includes two conditions, the first of the two conditions being that the channel quality of the first cell is worse than the first threshold; the second of the two conditions being that the channel quality of the second cell is better than a second threshold; wherein the first threshold is configured by the network, and the second threshold is configured by the network.

[0169] As an embodiment, when the channel quality of one cell is less than a threshold, the channel quality of the one cell is worse than the threshold.

[0170] As an embodiment, when the channel quality of one cell is not greater than a threshold, the channel quality of the one cell is worse than the threshold.

[0171] As an embodiment, when the channel quality of one cell is greater than a threshold, the channel quality of the one cell is better than the threshold.

[0172] As an embodiment, when the channel quality of one cell is not less than a threshold, the channel quality of the one cell is better than the threshold.

[0173] As an embodiment, the channel quality of a cell is represented by RSRP (Reference Signal Received Power), or RSRQ (Reference Signal Received Quality), or RSSI (Received Signal Strength Indicator), or SINR (Signal to Interference & Noise Ratio).

[0174] As an embodiment, the channel quality of a cell is obtained by measuring a reference signal of the cell.

[0175] As an embodiment, the cell measurement is performed at a protocol layer below L3 (Layer 3).

[0176] As an embodiment, the cell measurement is performed at L1 (layer 1).

[0177] As an embodiment, the reference signal is SSB (Synchronization Signal Block).

[0178] As an embodiment, the reference signal is SSB (Synchronization Signals / Physical Broadcast Channel).

[0179] As an embodiment, the reference signal is CSI-RS (Channel Status Information-Reference Signal).

[0180] As an embodiment, the channel quality of a cell is obtained by linearly processing a measured value of a reference signal of the cell and a configured offset value.

[0181] As a sub-embodiment of the above embodiment, the configured offset value includes at least one of four offset values: a measurement object specific offset value, a cell specific offset value, an event offset value, and a hysteresis parameter value for an event.

[0182] As an example, the channel quality of the first cell being worse than the first threshold includes: Mp < Mn; where Mp is the channel quality of the first cell; the first threshold is Mn, and Mn is the channel quality of the second cell.

[0183] As an example, the channel quality of the first cell being worse than the first threshold includes: Mp < Thresh1; where Mp is the channel quality of the first cell; the first threshold is Thresh1, and Thresh1 is configured.

[0184] As an example, the channel quality of the second cell being better than the second threshold includes: Mn > Thresh2; where Mn is the channel quality of the second cell; the second threshold is Thresh2, and Thresh2 is configured.

[0185] As an example, the channel quality of the first cell being worse than the first threshold includes: Mn + Ofn + Ocn – Hys > Mp + Ofp + Ocp + Off; where the channel quality of the first cell is Mp + Ofp + Ocp + Off; the first threshold is Mn + Ofn + Ocn – Hys; Mp is the result measured for the first cell; Ofp is the offset value specific to the measurement object for the first cell; Ocp is the cell-specific offset value for the first cell; Off is the offset value for the event; Mn is the result measured for the second cell; Ofn is the offset value specific to the measurement object for the second cell; Ocn is the cell-specific offset value for the second cell; Hys is the hysteresis parameter value for the event; when Mp and Mn are RSRP (Reference Signal Received Power), the units of Mp and Mn are dBm (decibel milliwatt); when Mp and Mn are RSRQ (Reference Signal Received Quality) or RS-SINR (Reference Signal-Signal to Interference & Noise Ratio), the units of Mp and Mn are dB (decibel); the units of Ofn, Ocn, Ofp, Ocp, Hys, and Off are dB.

[0186] As an example, that the channel quality of the first cell is worse than the first threshold includes: Mp + Hys < Thresh1; where the channel quality of the first cell is Mp + Hys, the first threshold is Thresh1; Mp is the result measured for the first cell; Hys is the hysteresis parameter value for the event; and Thresh1 is configured.

[0187] As an example, that the channel quality of the second cell is better than the second threshold includes: the channel quality of the second cell is Mn + Ofn + Ocn – Hys, the second threshold is Thresh2; where Mn is the result measured for the second cell; Ofn is the offset value dedicated to the measurement object for the second cell; Ocn is the cell-specific offset value for the second cell; Hys is the hysteresis parameter value for the event; and Thresh2 is configured.

[0188] As an example, when Mp and Mn are RSRP, the units of Mp and Mn are dBm (decibel milliwatt); when Mp and Mn are RSRQ or RS (Reference Signal)-SINR, the units of Mp and Mn are dB (decibel); the units of Ofn, Ocn, and Hys are dB, the unit of Threshold1 is the same as that of Mp; and the unit of Threshold2 is the same as that of Mn.

[0189] As an example, when the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is started to be applied.

[0190] As an example, in response to the first condition set for the second cell being satisfied, at least part of the configuration of the second cell is started to be applied.

[0191] As an example, starting to apply at least part of the configuration of the second cell includes: starting to apply all the configurations of the second cell.

[0192] As an example, starting to apply at least part of the configuration of the second cell includes: starting to apply part of the configurations of the second cell.

[0193] As a sub-example of the above example, the remaining part of the configuration of the second cell has been applied.

[0194] As an embodiment, the first condition set for the second cell is met, triggering cell switching to the second cell.

[0195] As a sub-embodiment of the above embodiment, the configuration of the first cell is cleared.

[0196] As a sub-embodiment of the above embodiment, the configuration of the first cell is stored.

[0197] As an embodiment, in response to the first set of conditions for the second cell being met, a first timing advance command is monitored on the second cell.

[0198] As an embodiment, the first condition set for the second cell is satisfied and is used to trigger monitoring of a first timing advance command on the second cell.

[0199] As an embodiment, the first timing advance command is not monitored on the second cell before the first condition set for the second cell is met.

[0200] As an embodiment, the monitoring includes blind decoding, and judging whether the decoding is correct based on a CRC (Cyclic Redundancy Check).

[0201] As an embodiment, monitoring the first timing advance command on the second cell includes monitoring PDCCH (Physical Downlink Control CHannel), and a PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0202] As a sub-embodiment of the above embodiment, the CRC of the PDCCH is scrambled by RA (Random Access)-RNTI (Radio Network Temporary Identifier).

[0203] As a sub-embodiment of the above embodiment, the CRC of the PDCCH is scrambled by C (Cell)-RNTI, and the C-RNTI is configured by the base station of the second cell.

[0204] As an embodiment, the first timing advance command is a MAC sublayer message.

[0205] As an embodiment, the first timing advance command is a MAC CE (Control Element).

[0206] As a sub-embodiment of the above embodiment, the timing advance command is an Absolute Timing Advance Command (absolute timing advance command).

[0207] As a sub-embodiment of the above embodiment, the timing advance command is a Timing Advance Command.

[0208] As a sub-embodiment of the above embodiment, the timing advance command is carried in LTM Cell Switch Command (LTM cell switching command).

[0209] As an embodiment, when the first timing advance command is monitored on the second cell, the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0210] As an embodiment, the time alignment timer associated with the timing advance group to which the second cell belongs is not running, including: no timing advance command for the timing advance group to which the second cell belongs is received.

[0211] As an embodiment, the time alignment timer associated with the timing advance group to which the second cell belongs is not running, including: the first node does not measure the timing advance for the timing advance group to which the second cell belongs.

[0212] As a sub-embodiment of the above embodiment, the first node is not configured to measure the timing advance for the timing advance group to which the second cell belongs.

[0213] As a sub-embodiment of the above embodiment, the first node does not have the ability to measure the timing advance for the timing advance group to which the second cell belongs.

[0214] As an embodiment, the timing advance group includes at least one cell, and the same transmission timing is adopted for the at least one cell included in the timing advance group.

[0215] As an embodiment, the expiration value of the time alignment timer is configurable.

[0216] As an embodiment, the expiration value of the time alignment timer is determined by the UE itself.

[0217] As an embodiment, the expiration value of the time alignment timer is pre-configured or specified.

[0218] As an embodiment, the time alignment timer is maintained in the MAC (Medium Access Control) sublayer.

[0219] As an embodiment, the time alignment timer controls the length of time that a MAC entity considers that the uplink time of cells associated with the timing advance group is aligned.

[0220] As an embodiment, the first timing advance command is used to determine the uplink timing sent in the second cell.

[0221] As an embodiment, the first timing advance command is applied to the timing advance group to which the second cell belongs.

[0222] As an embodiment, the first timing advance command triggers the start of the time alignment timer.

[0223] As an embodiment, when the time alignment timer is running, the uplink time of the first node and the cells in the timing advance group are aligned.

[0224] As an embodiment, when the time alignment timer is not running, the first node has not yet obtained uplink time alignment with the second cell, and the uplink sending timing of the first node in the second cell is the same as the sending timing of the random access sequence.

[0225] Example 2

[0226] Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the attached Figure 2 shown. Figure 2A diagram illustrating a network architecture 200 for NR 5G, LTE (Long-Term Evolution) and LTE-A (Long-Term Evolution Advanced) systems. The NR 5G, LTE or LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, NG-RAN (Next Generation Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet services 230. The 5GS / EPS may be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, 5GS / EPS provides packet switching services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application can be extended to networks providing circuit switching services or other cellular networks. NG-RAN includes NR Node B (gNB) 203 and other gNBs 204. gNB 203 provides user and control plane protocol terminations toward UE 201. gNB 203 can be connected to other gNBs 204 via an Xn interface (e.g., backhaul). gNB 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (Transmission Reception Point), or some other suitable term. In a NTN (Non Terrestrial Network, non-terrestrial / satellite network) network, gNB 203 may be a satellite, an aircraft, or a ground base station relayed by a satellite. gNB 203 provides an access point to 5GC / EPC 210 for UE 201.Examples of UE 201 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, cars, vehicle-mounted devices, vehicle-mounted communication units, wearable devices, or any other similar functional devices. Those skilled in the art may also refer to UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term. gNB203 is connected to 5GC / EPC210 via the S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF213. MME / AMF / SMF211 is the control node that handles signaling between UE201 and 5GC / EPC210. ​​In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which itself is connected to P-GW / UPF213. P-GW provides UE IP address allocation and other functions. P-GW / UPF213 is connected to Internet service 230. Internet service 230 includes operator-corresponding Internet protocol services, which may specifically include Internet, Intranet, IMS (IP Multimedia Subsystem) and PS (Packet Switching) streaming services.

[0227] As an embodiment, the UE201 corresponds to the first node in this application.

[0228] As an embodiment, the NR node B203 corresponds to the second node in this application.

[0229] As an embodiment, the gNB203 is a macro cell base station.

[0230] As an embodiment, the gNB203 is a micro cell base station.

[0231] As an embodiment, the gNB203 is a pico cell base station.

[0232] As an embodiment, the gNB203 is a home base station (Femtocell).

[0233] As an embodiment, the gNB203 is a base station device that supports large delay difference.

[0234] As an embodiment, the gNB203 is a flying platform device.

[0235] As an embodiment, the gNB203 is a satellite device.

[0236] As an embodiment, the gNB203 is a testing device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0237] As an embodiment, the wireless link from the UE201 to the gNB203 is an uplink, and the uplink is used to perform uplink transmission.

[0238] As an embodiment, the wireless link from the gNB203 to the UE201 is a downlink, and the downlink is used to perform downlink transmission.

[0239] As an embodiment, the UE201 and the gNB203 are connected via a Uu interface.

[0240] Example 3

[0241] Embodiment 3 illustrates a schematic diagram of a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application, as shown in the attached figure. Figure 3 shown. Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture of the control plane 300 of the UE and gNB is shown in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to as PHY 301 in this article. Layer 2 (L2 layer) 305 is above PHY 301 and is responsible for the link between the UE and the gNB through PHY 301. The L2 layer 305 includes the MAC (Medium Access Control) sublayer 302, the RLC (Radio Link Control) sublayer 303, and the PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the gNB on the network side. The PDCP sublayer 304 provides data encryption and integrity protection. The PDCP sublayer 304 also provides support for inter-zone mobility of UEs between gNBs. The RLC sublayer 303 provides segmentation and reassembly of data packets, and retransmission of lost data packets through ARQ. The RLC sublayer 303 also provides duplicate data packet detection and protocol error detection. The MAC sublayer 302 provides mapping between logical and transport channels and multiplexing of logical channel identities. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between UEs. The MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the gNB and the UE. Although not shown in the figure, a V2X layer may also be provided above the RRC sublayer 306 in the control plane 300 of the UE. The V2X layer is responsible for generating a PC5 QoS parameter group and QoS rules based on the received service data or service request, generating a PC5 QoS flow corresponding to the PC5 QoS parameter group, and sending the PC5 QoS flow identifier and the corresponding PC5QoS parameter group to the AS (Access Stratum) layer for the AS layer to perform QoS processing on the data packets belonging to the PC5 QoS flow identifier; the V2X layer also includes a PC5-S signaling protocol (PC5-Signaling Protocol) sublayer, and the V2X layer is responsible for indicating to the AS layer whether each transmission is a PC5-S transmission or a V2X service data transmission.The wireless protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer). The wireless protocol architecture in the user plane 350 is substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce wireless transmission overhead. The L2 layer 355 in the user plane 350 also includes a SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping between QoS (Quality of Service) flows and data radio bearers (DRBs) to support the diversity of services. The wireless protocol architecture of the UE in the user plane 350 may include, at the L2 layer, a SDAP sublayer 356, a PDCP sublayer 354, a portion of or all of the protocol sublayers of the RLC sublayer 353 and the MAC sublayer 352. Although not shown, the UE may also have several upper layers above the L2 layer 355, including a network layer (e.g., an IP layer) terminated at the P-GW on the network side and an application layer terminated at the other end of the connection (e.g., a remote UE, a server, etc.).

[0242] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0243] As an example, Figure 3 The wireless protocol architecture in is applicable to the second node in this application.

[0244] As an embodiment, the first RRC signaling in the present application is generated in the RRC306.

[0245] As an embodiment, the first timing advance command in the present application is generated by the MAC302 or the MAC352.

[0246] As an embodiment, the PDSCH in the present application is generated in the PHY301 or the PHY351.

[0247] As an embodiment, the PDCCH in the present application is generated in the PHY301 or the PHY351.

[0248] As an embodiment, the first random access sequence in the present application is generated in the PHY301 or the PHY351.

[0249] As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

[0250] Example 4

[0251] Embodiment 4 illustrates a hardware module schematic diagram of a communication device according to an embodiment of the present application, as shown in the attached Figure 4 shown. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0252] 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.

[0253] The second communication device 410 includes a controller / processor 475, a memory 476, a data source 477, 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.

[0254] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, the upper layer data packets from the core network or the upper layer data packets from the data source 477 are provided to the controller / processor 475. The core network and the data source 477 represent all the protocol layers above the L2 layer. 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 the retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. The multi-antenna transmit processor 471 then performs a transmit analog precoding / beamforming operation on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, and then provides it to a different antenna 420.

[0255] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream and provides it to the receiving processor 456. The receiving processor 456 and the multi-antenna receiving processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiving processor 458 performs a receiving analog precoding / beamforming operation on the baseband multi-carrier symbol stream from the receiver 454. The receiving processor 456 uses a fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receiving analog precoding / beamforming operation from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiving processor 456, wherein the reference signal will be used for channel estimation, and the data signal is recovered after multi-antenna detection in the multi-antenna receiving processor 458 to any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in the receiving processor 456, and soft decisions are generated. The receiving processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program codes and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the second communication device 410. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0256] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, the upper layer data packets are provided to the controller / processor 459 using the data source 467. The data source 467 represents all the protocol layers above the L2 layer. Similar to the transmission function at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements L2 layer functions for user plane and control plane. The controller / processor 459 is also responsible for the retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping and channel coding processing, and the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Then, the transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, which is then provided to different antennas 452 via the transmitter 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream, and then provides it to the antenna 452.

[0257] 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 reception functions at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna reception processor 472 and the reception processor 470. The reception processor 470 and the multi-antenna reception processor 472 jointly implement the functions of the L1 layer. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the first communication device 450. The upper layer data packets from the controller / processor 475 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0258] As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 apparatus at least: receives a first RRC signaling, and evaluates whether a first condition set for the second cell is met, the first RRC signaling indicates the configuration of the second cell and the second cell, and the second cell is a switching candidate cell; the first condition set for the second cell is met, starts to apply at least part of the configuration of the second cell, and triggers listening to a first timing advance command on the second cell, the first timing advance command is a MAC sublayer message; wherein the first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0259] As an embodiment, the first communication device 450 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, and the action includes: receiving a first RRC signaling, and evaluating whether a first condition set for the second cell is met, the first RRC signaling indicating the configuration of the second cell and the second cell, and the second cell is a switching candidate cell; the first condition set for the second cell is met, at least part of the configuration of the second cell is applied, and triggering listening to a first timing advance command on the second cell, the first timing advance command is a MAC sublayer message; wherein the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0260] As an embodiment, the second communication device 410 device includes: at least one processor and at least one memory, the at least one memory includes computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second communication device 410 device at least: sends a first RRC signaling, the first RRC signaling indicates the configuration of the second cell and the second cell, the second cell is a handover candidate cell; sends the first timing advance command on the first cell.

[0261] As an embodiment, the second communication device 410 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, and the action includes: sending a first RRC signaling, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, and the second cell is a switching candidate cell; and sending the first timing advance command on the first cell.

[0262] As an embodiment, the second communication device 410 device includes: at least one processor and at least one memory, the at least one memory includes computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second communication device 410 device at least: sends a first timing advance command on the second cell, the first timing advance command is a MAC sublayer message; receives the first random access sequence.

[0263] As an embodiment, the second communication device 410 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: sending a first timing advance command on the second cell, wherein the first timing advance command is a MAC sublayer message; and receiving the first random access sequence.

[0264] As an embodiment, the second communication device 410 device includes: at least one processor and at least one memory, the at least one memory includes computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second communication device 410 device at least: sends a first RRC signaling, the first RRC signaling indicates the configuration of the second cell and the second cell, the second cell is a handover candidate cell; sends the first timing advance command on the first cell; sends the first timing advance command on the second cell, the first timing advance command is a MAC sublayer message; receives the first random access sequence.

[0265] As an embodiment, the second communication device 410 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: sending a first RRC signaling, wherein the first RRC signaling indicates the configuration of a second cell and the second cell, and the second cell is a switching candidate cell; sending the first timing advance command on the first cell; sending the first timing advance command on the second cell, and the first timing advance command is a MAC sublayer message; and receiving the first random access sequence.

[0266] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0267] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0268] As an embodiment, the first communication device 450 is a UE.

[0269] As an embodiment, the first communication device 450 is a relay.

[0270] As an embodiment, the second communication device 410 is a base station device.

[0271] As an embodiment, the second communication device 410 is a distribution unit of a base station.

[0272] As an embodiment, the second communication device 410 is a piece of code in a distributed unit of a base station.

[0273] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the first RRC signaling in the present application.

[0274] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the first RRC signaling in the present application.

[0275] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the first timing advance command in the present application.

[0276] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the first timing advance command in the present application.

[0277] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the PDSCH in the present application.

[0278] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the PDSCH in the present application.

[0279] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the PDCCH in the present application.

[0280] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the PDCCH in the present application.

[0281] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468 or the controller / processor 459 is used to send the first random access sequence in the present application.

[0282] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 or the controller / processor 475 is used to receive the first random access sequence in the present application.

[0283] Example 5

[0284] Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Figure 5 As shown in the attached Figure 5 In the example, the first node N51 and the second transmitter N52 communicate through the first cell, and the first node N51 and the first transceiver N53 communicate through the second cell. It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in this application.

[0285] for First node N51 , receiving the first RRC signaling in step S511; evaluating whether the first condition set for the second cell is met in step S512; sending the first random access sequence in step S513; starting to apply the configuration of the second cell when the first condition set for the second cell is met in step S514; and listening to the first timing advance command on the second cell in step S515.

[0286] for Second transmitter N52 , sending the first RRC signaling in step S521.

[0287] for The first transceiver N53 , receiving a first random access sequence in step S531; and sending a first timing advance command on the second cell in step S532.

[0288] In Example 5, a first RRC signaling is received, and an evaluation is performed as to whether a first condition set for the second cell is met, the first RRC signaling indicating the configuration of the second cell and the second cell, the second cell being a candidate cell for switching; when the first condition set for the second cell is met, at least part of the configuration of the second cell is started to be applied, and monitoring of a first timing advance command on the second cell is triggered, the first timing advance command being a MAC sublayer message; as a response to receiving the first RRC signaling, the first random access sequence is sent; wherein the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for sending the first random access sequence; the start of applying at least part of the configuration of the second cell includes: starting to apply the configuration of the second cell except the configuration for random access.

[0289] As an embodiment, the first node N51 communicates with the second transmitter N52 through the first cell.

[0290] As an embodiment, the first node N51 communicates with the first transceiver N53 through the second cell.

[0291] As an embodiment, the second transmitter N52 and the first transceiver N53 belong to the same gNB-DU (Distributed Unit).

[0292] As an embodiment, the second transmitter N52 and the first transceiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with the same gNB-CU (Central Unit).

[0293] As an embodiment, the second transmitter N52 and the first transceiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with two different gNB-CUs.

[0294] As an embodiment, the second transmitter N52 and the first transceiver N53 belong to the same base station.

[0295] As an embodiment, the second transmitter N52 and the first transceiver N53 belong to different base stations.

[0296] As an embodiment, a base station includes a gNB-CU and at least one gNB-DU associated with the gNB-CU, and the gNB-CU is connected to any gNB-DU of the at least one gNB-DU through an F1 interface.

[0297] As an embodiment, the second transmitter N52 belongs to the base station of the first cell; the first transceiver N53 belongs to the base station of the second cell.

[0298] As an embodiment, the base station of the first cell and the base station of the second cell are the same base station.

[0299] As an embodiment, the base station of the first cell and the base station of the second cell are different base stations.

[0300] As an embodiment, in response to receiving the first RRC signaling, a first random access sequence is sent on the second cell.

[0301] As an embodiment, the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for sending the first random access sequence.

[0302] As an embodiment, the configuration for random access is applied immediately after being received.

[0303] As an embodiment, the configuration for random access includes a dedicated random access configuration (rach-ConfigDedicated).

[0304] As an embodiment, the air interface resources include UL (Uplink) / SUL (Supplementary UpLink) indication.

[0305] As an embodiment, the air interface resources include SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) indexes.

[0306] As an embodiment, the air interface resources include a PRACH (Physical Random Access CHannel) mask index.

[0307] As an embodiment, the air interface resources include an index of the first random access sequence.

[0308] As an embodiment, the random access sequence in the present application means a random access preamble.

[0309] As an embodiment, the first random access sequence is a signature sequence.

[0310] As an embodiment, the first random access sequence is a Gold sequence.

[0311] As an embodiment, the first random access sequence is an M sequence.

[0312] As an embodiment, the first random access sequence is a ZC (Zadoff–Chu) sequence.

[0313] As an embodiment, when the first condition set for the second cell is met, starting to apply the at least partial configuration of the second cell includes: starting to apply the configuration of the second cell except the configuration for random access.

[0314] As an embodiment, the configuration for random access is applied before the first set of conditions for the second cell is met.

[0315] As an embodiment, the first receiver receives a PDCCH order (command), and the PDCCH order is used to trigger sending the first random access sequence on the second cell.

[0316] As a sub-embodiment of the above embodiment, the PDCCH order includes air interface resources for sending the first random access sequence.

[0317] As a sub-embodiment of the above embodiment, the PDCCH order is received in the first cell.

[0318] As a sub-embodiment of the above embodiment, the PDCCH order is received in the second cell.

[0319] As a sub-embodiment of the above embodiment, the first condition set for the second cell is satisfied, and starting to apply at least part of the configuration of the second cell includes: starting to apply all configurations of the configuration of the second cell.

[0320] The above method can more effectively control the UE by triggering the network to send the first random access sequence.

[0321] As an embodiment, when uplink data arrives, the first random access sequence is sent triggered by RRC.

[0322] As an embodiment, the sending of the first random access sequence is triggered by a MAC entity.

[0323] As an embodiment, sending of the first random access sequence is triggered by physical layer measurement.

[0324] As an embodiment, a second condition set for the second cell is met, triggering the sending of the first random access sequence on the second cell, the second condition set including that the channel quality of the first cell is worse than a third threshold, and the third threshold is not less than the first threshold.

[0325] The above method can effectively avoid unnecessary random access sequence transmission.

[0326] As a sub-embodiment of the above four embodiments, the first condition set for the second cell is met, and starting to apply at least part of the configuration of the second cell includes: starting to apply all configurations of the configuration of the second cell.

[0327] As an embodiment, the second condition set includes conditions for triggering the sending of the first random access sequence.

[0328] As an embodiment, the second condition set includes a condition, wherein the channel quality of the first cell is worse than the third threshold; wherein the third threshold is the channel quality of the second cell.

[0329] As an embodiment, the first condition set includes a condition, wherein the channel quality of the first cell is worse than the third threshold; wherein the third threshold is the difference between the channel quality of the second cell and an offset value, and the offset value is configured.

[0330] As an embodiment, the first condition set includes two conditions, the first of the two conditions being that the channel quality of the first cell is worse than the third threshold; the second of the two conditions being that the channel quality of the second cell is better than a fourth threshold; wherein the third threshold is configured by the network, and the fourth threshold is configured by the network.

[0331] As an embodiment, the first condition set is not satisfied when the second condition set is satisfied.

[0332] As an embodiment, the first random access sequence is configured by the base station of the second cell, and then forwarded to the base station of the first cell and sent to the first node through the first cell.

[0333] As an embodiment, after sending the first random access sequence and before the first condition set for the second cell is satisfied, the first node does not receive a timing advance command for a timing advance group to which the second cell belongs.

[0334] As an embodiment, after sending the first random access sequence, the random access process to which the first random access sequence belongs ends; wherein the first condition set for the second cell is not met.

[0335] As an embodiment, a random access response window is started as a response to sending the first random access sequence; wherein the first condition set for the second cell is met.

[0336] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the configuration of the second cell is configured by the base station of the second cell, and then forwarded to the base station of the first cell through the backhaul network, and sent to the first node by the second transmitter N52.

[0337] As an embodiment, the backhaul network is ideal.

[0338] As an embodiment, the backhaul network is non-ideal.

[0339] As an embodiment, the first random access sequence is dedicated to the first node.

[0340] As an embodiment, the first random access sequence is sent in a random access occasion, and the occasion of sending the first random access sequence may be earlier than, equal to, or later than the time of starting to evaluate whether the first condition set for the second cell is met.

[0341] Example 6

[0342] Embodiment 6 illustrates a schematic diagram of a time-frequency resource block of a first downlink allocation indication according to an embodiment of the present application, as shown in the attached figure. Figure 6 As shown in the attached Figure 6 In FIG. 1 , the rectangular box represents the time-frequency resource block indicated by the first downlink allocation.

[0343] As an embodiment, monitoring the first timing advance command on the second cell includes monitoring PDSCH on the second cell.

[0344] As an embodiment, the monitoring of PDSCH includes monitoring wireless signals on the PDSCH channel.

[0345] As an embodiment, monitoring the PDSCH includes monitoring a wireless signal transmitted through a PDSCH channel.

[0346] As an embodiment, the monitoring of PDSCH includes blind decoding of PDSCH.

[0347] As an embodiment, the monitoring of PDSCH includes blind decoding of wireless signals on the PDSCH channel.

[0348] As an embodiment, monitoring the PDSCH includes decoding the PDSCH, and determining whether the decoding is correct based on a CRC check.

[0349] The sending, or receiving, or monitoring of PDSCH in the present application includes: sending, or receiving, or monitoring wireless signals through PDSCH; it is also applicable to other physical channels, and other physical channels include but are not limited to PDCCH, PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), and PRACH.

[0350] Decoding PDSCH in the present application includes: decoding a wireless signal received through PDSCH; it is also applicable to other physical channels, including but not limited to PDCCH, PUCCH, and PUSCH.

[0351] As an embodiment, the PDSCH is used to send the first timing advance command.

[0352] Specifically, a TB (transport block) is used to generate a wireless signal, and the wireless signal is sent through the PDSCH channel; wherein the TB includes the first timing advance command.

[0353] Specifically, a TB is a MAC PDU (Protocol Data Unit), the MAC PDU includes a MAC CE, and the MAC CE includes the first timing advance command.

[0354] As an embodiment, all or part of the bits included in a TB are sequentially subjected to CRC calculation, channel coding, rate matching, scrambling, modulation, layer mapping, antenna port mapping, mapping to virtual resource blocks, mapping from virtual to physical resource blocks, OFDM baseband signal generation, and modulation and upconversion to generate a wireless signal.

[0355] As an embodiment, the time-frequency resource blocks occupied by the PDSCH are indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

[0356] As an embodiment, the time-frequency resource block includes time domain resources and frequency domain resources.

[0357] As an embodiment, the first RRC signaling configures the time domain resources and frequency domain resources indicated by the first downlink allocation.

[0358] As an embodiment, the first downlink allocation indicates a periodic time-frequency resource block.

[0359] As an embodiment, the first RRC signaling configures the period of the first downlink allocation.

[0360] As an embodiment, the first RRC signaling configures the starting position of the first downlink allocation in the time domain.

[0361] As an embodiment, the first RRC signaling configures a system frame, and the first downlink allocates an offset in the time domain for the one system frame.

[0362] As an embodiment, the first RRC signaling configures at least the former of the starting position of the symbol occupied by the first downlink allocation in the time domain and the length of the occupied symbol.

[0363] As an embodiment, the first RRC signaling configures the starting position of the first downlink allocation in the frequency domain and the size of the RBG (Resource Block Group) included.

[0364] As an embodiment, the first RRC signaling configures resource allocation of the first downlink allocation in the frequency domain, and the resource allocation (resource allocation) includes resource allocation type 0 (resourceAllocationType 0), resource allocation type 1 (resourceAllocationType 1) and dynamic switching (dynamicSwitch).

[0365] As an embodiment, the first RRC signaling configures a frequency hopping mode of the first downlink allocation in the frequency domain, and the frequency hopping mode includes intraSlot and interSlot.

[0366] As an embodiment, the first RRC signaling configures the MCS (Modulation and Coding Scheme) of the first downlink allocation.

[0367] As an embodiment, the first RRC signaling configures a transform precoder (transformPrecoder) of the first downlink allocation.

[0368] As an embodiment, the first RRC signaling configures the number of HARQ (Hybrid Automatic Repeat Request) processes (process number) allocated by the first downlink.

[0369] As an embodiment, the first RRC signaling includes an IE (Information element), and the IE is used to configure the first downlink allocation.

[0370] As an embodiment, the name of the IE includes semi-persistent.

[0371] As an embodiment, the IE is SPS (semi-persistent scheduling)-Config IE.

[0372] As an embodiment, the name of the IE includes configured.

[0373] As an embodiment, the IE is ConfiguredAssignmentConfig.

[0374] As an embodiment, the first downlink allocation is SPS (semi-persistent scheduling).

[0375] As an embodiment, the first downlink assignment is a type 1 configured downlink assignment.

[0376] As an embodiment, the first downlink allocation is a type 2 configured downlink allocation.

[0377] As an embodiment, the first downlink allocation pre-configures multiple time-frequency resource blocks.

[0378] As an embodiment, the periodic time-frequency resource block indicated by the first downlink allocation is reserved for sending the first timing advance command.

[0379] Example 7

[0380] Embodiment 7 illustrates a schematic diagram of the relationship between uplink transmission and the first timing advance command according to an embodiment of the present application, as shown in the attached figure. Figure 7 shown.

[0381] As an embodiment, the first timing advance command is applied to the timing advance group to which the second cell belongs.

[0382] As an embodiment, the first node obtains the timing advance value for the timing advance group according to the first timing advance command and the first offset value.

[0383] As an embodiment, the first offset value is configured by RRC signaling, or the first offset value is determined by UE.

[0384] As a sub-embodiment of the above embodiment, when the RRC signaling indicates the first offset value, the first offset value is determined by the RRC signaling; when the RRC signaling does not indicate the first offset value, the first offset value is determined by the UE.

[0385] Specifically, the timing advance value is Among them, the N TA =T A ·16·64 / 2 μ , the T A =0, 1, 2, ..., 3846, indicated by the first timing advance command, 2 μ15 kHz is the subcarrier spacing (SCS) of the timing advance group, and the value of μ is 0, 1, 2, 3, 4, 5, 6; N TA，offset n-TimingAdvanceOffset (timing advance offset) configured by RRC signaling. If the n-TimingAdvanceOffset is not included in the RRC signaling configuration, the first node can obtain the N TA，offset ; The three parameters TACommon (common timing advance), TACommonDrift (common timing advance drift), and TACommonDriftVariation (common timing advance drift variation) configured by RRC signaling indicate that if these three parameters are not configured by RRC signaling, the is 0; The satellite-ephemeris-related high-level parameters are calculated and obtained through the RRC signaling configuration. If the high-level parameters are not configured in the RRC signaling, the is 0; said Tc=1 / (Δf max .N f ), where Δf max =480·10 3 Hz(Hertz), N f =4096.

[0386] As an embodiment, the first offset value is determined by the UE, including: the first node obtains the N defined for the duplex mode and frequency range of the second cell by looking up a table. TA，offset .

[0387] As an embodiment, the timing advance value is used for the transmission timing of any cell included in the timing advance group.

[0388] As an embodiment, the sending timing of a wireless signal is an advance value of the start time of starting to send the wireless signal that is earlier than the start time of a time unit occupied by the wireless signal.

[0389] Specifically, the time unit occupied by the wireless signal is a time slot, and the advance value is T TA For example, the wireless signal occupies time slot k, and the wireless signal is T before the start time of time slot k. TA Start sending.

[0390] As an embodiment, the first timing advance command depends on uplink transmission in any cell included in the timing advance group.

[0391] As an embodiment, the first timing advance command depends on uplink transmission in the second cell.

[0392] As an embodiment, the first timing advance command is related to uplink transmission in any cell included in the timing advance group.

[0393] As an embodiment, the first timing advance command is generated according to uplink transmission in any cell included in the timing advance group.

[0394] As an embodiment, the uplink sending includes sending a random access sequence.

[0395] As an embodiment, the uplink sending includes sending MsgA.

[0396] As an embodiment, the uplink sending includes sending the first random access sequence.

[0397] As an embodiment, the first timing advance command is for the first random access sequence.

[0398] As an embodiment, the first timing advance command includes for the first random access sequence: the first random access sequence is used to generate the first timing advance command.

[0399] As an embodiment, the first timing advance command for the first random access sequence includes: reception of the first random access sequence is used to trigger sending of the first timing advance command.

[0400] As an embodiment, the first timing advance command for the first random access sequence includes: sending the first timing advance command is a response to receiving the first random access sequence.

[0401] As an embodiment, the first timing advance command for the first random access sequence includes: sending of the first timing advance command must be caused by sending of the first random access sequence.

[0402] As an embodiment, the uplink transmission includes sending the PUSCH on the time-frequency resource blocks indicated by the configuration grant.

[0403] As an embodiment, the sending of PUSCH includes: sending a wireless signal through the PUSCH channel.

[0404] As an embodiment, the air interface resources occupied by the PUSCH are pre-configured.

[0405] As an embodiment, the air interface resources occupied by the PUSCH are indicated by the configured grant.

[0406] As an embodiment, the first RRC signaling is used to configure the configuration grant.

[0407] As an embodiment, the first condition set for the second cell is met and the configuration granting configuration begins to be applied.

[0408] As an embodiment, the configuration grant is a type 1 configuration grant.

[0409] As an embodiment, the configuration grant indicates periodic time-frequency resource blocks.

[0410] As an embodiment, the PUSCH is sent after the first set of conditions is met.

[0411] As an embodiment, the PUSCH is used to send the first uplink data.

[0412] As an embodiment, the first uplink data belongs to SRB (Signaling Radio Bearer).

[0413] As an embodiment, the first uplink data belongs to DRB (Data Radio Bearer).

[0414] As an embodiment, the first uplink data is RRCReconfigurationComplete (RRC configuration completed).

[0415] As an embodiment, the transmission timing of the PUSCH is the same as the transmission timing of the first random access sequence.

[0416] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the timing advance value of the time for starting to send the PUSCH is earlier than the start time of the time unit occupied by the PUSCH, and the timing advance value of the time for starting to send the first random access sequence is earlier than the start time of the time unit occupied by the first random access sequence.

[0417] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the time for starting to send the PUSCH is earlier than the start time of the time unit occupied by the PUSCH by a timing advance value, and the time for starting to send the first random access sequence is earlier than the start time of the time unit occupied by the first random access sequence by the timing advance value.

[0418] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the sending timing of the PUSCH is the same as N TA Not relevant.

[0419] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the sending timing of the PUSCH is not dependent on the reception of the timing advance command.

[0420] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the sending timing of the PUSCH is independent of downlink measurement in the cell included in the timing advance group.

[0421] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: N in the calculation of the sending timing of the PUSCH TA The value of is 0.

[0422] As an embodiment, the sending timing of the PUSCH is the same as the sending timing of the first random access sequence, including: the calculation of the sending timing of the PUSCH does not depend on N TA The value of .

[0423] As an embodiment, the first timing advance command is for the PUSCH.

[0424] As an embodiment, the first timing advance command is generated according to a DMRS (DeModulation Reference Signal) included in the PUSCH.

[0425] As an embodiment, the uplink sending includes sending PRS.

[0426] As an embodiment, the first timing advance command is generated according to the PRS (Positioning Reference Signal).

[0427] Example 8

[0428] Embodiment 8 illustrates a schematic diagram of monitoring a first timing advance command on a first cell and monitoring a first timing advance command on a second cell according to an embodiment of the present application, as shown in the attached figure. Figure 8 shown.

[0429] As an embodiment, after sending the first random access sequence, monitoring the first timing advance command; wherein the first random access sequence is sent before the first condition set for the second cell is met.

[0430] As an embodiment, whether to monitor the first timing advance command on the first cell or the second cell depends on whether the first condition set is met.

[0431] As an embodiment, whether to monitor the first timing advance command in the first cell or the second cell is determined according to whether the first condition set is satisfied.

[0432] As an embodiment, before the first condition set for the second cell is met, the first timing advance command is monitored on the first cell.

[0433] As an embodiment, monitoring the first timing advance command on the first cell includes monitoring PDCCH on the first cell; and a PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0434] As a sub-embodiment of the above embodiment, the CRC of the PDCCH is scrambled by a C-RNTI, and the C-RNTI is configured by the base station of the first cell.

[0435] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the first timing advance command is obtained at the base station of the second cell, and then forwarded to the base station of the first cell through the backhaul network (backhaul), and sent to the first node by the base station of the first cell.

[0436] As an embodiment, the first timing advance command is not received before the first condition set for the second cell is met.

[0437] In the accompanying drawing of Example 8, before the first condition set for the second cell is met, the uplink sending is performed, and the uplink sending includes sending the first random access sequence; after sending the first random access sequence, starting to listen to the first timing advance command; specifically including: before the first condition set for the second cell is met, listening to the first timing advance command on the first cell; when the first condition set for the second cell is met and the first timing advance command is not received, triggering listening to the first timing advance command on the second cell.

[0438] Example 9

[0439] Embodiment 9 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 attached figure. Fig. 9 As shown in the attached Fig. 9 In the embodiment, the first node processing device 9 includes a first receiver 901 and a first transmitter 902; the first node 900 is a UE.

[0440] In Example 9, a first receiver 901 receives a first RRC signaling and evaluates whether a first condition set for the second cell is met, the first RRC signaling indicating the configuration of the second cell and the second cell, the second cell being a switching candidate cell; the first receiver 901, when the first condition set for the second cell is met, starts to apply at least part of the configuration of the second cell, and triggers listening to a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; wherein the first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; and the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0441] As an embodiment, monitoring the first timing advance command on the second cell includes monitoring PDSCH; wherein the time-frequency resource block occupied by the PDSCH is indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

[0442] As an embodiment, monitoring the first timing advance command on the second cell includes monitoring PDSCH; wherein the time-frequency resource blocks occupied by the PDSCH are indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation; the first downlink allocation indicates periodic time-frequency resource blocks.

[0443] As an embodiment, the first timing advance command is applied to the timing advance group, and the first timing advance command depends on the uplink transmission in any cell included in the timing advance group; wherein the uplink transmission includes sending a first random access sequence, or the uplink transmission includes sending PUSCH on the time-frequency resource block indicated by the configuration grant.

[0444] As an embodiment, the first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink transmission in any cell included in the timing advance group; wherein the uplink transmission includes sending a first random access sequence, or the uplink transmission includes sending PUSCH on the time-frequency resource block indicated by the configuration grant; the first transmitter 902, as a response to receiving the first RRC signaling, sends the first random access sequence; wherein the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for sending the first random access sequence; the start of applying the at least partial configuration of the second cell includes: starting to apply the configuration of the second cell except the configuration for random access.

[0445] As an embodiment, the first receiver 901 listens to the first timing advance command on the first cell before the first condition set for the second cell is satisfied.

[0446] As an embodiment, the first receiver 901 listens to the first timing advance command on the first cell before the first condition set for the second cell is met; listening to the first timing advance command on the first cell includes listening to PDCCH; wherein the PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0447] As an embodiment, the first receiver 901 includes the attached Figure 4 The receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 and controller / processor 459.

[0448] As an embodiment, the first receiver 901 includes the attached Figure 4 At least one of the receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 or controller / processor 459.

[0449] As an embodiment, the first transmitter 901 includes the attached Figure 4The transmitter 454 (including antenna 452), transmit processor 468, multi-antenna transmit processor 457 and controller / processor 459.

[0450] As an embodiment, the first transmitter 901 includes the attached Figure 4 At least one of the receiver 454 (including antenna 452), transmit processor 468, multi-antenna transmit processor 457 or controller / processor 459.

[0451] Example 10

[0452] Embodiment 10 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application, as shown in the attached figure. Fig.10 As shown in the attached Fig.10 In the figure, the dotted box indicates that it is optional, the second node processing device 1000 includes a second transmitter 1001, or the second node processing device 1000 includes a first transceiver 1002, or the second node processing device 1000 includes a second transmitter 1001 and a first transceiver 1002; the second node 1000 is a base station.

[0453] In embodiment 10, a first transmitter 1001 sends a first RRC signaling, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, the second cell being a handover candidate cell; wherein whether a first condition set for the second cell is satisfied is evaluated; the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is applied, and is triggered to monitor a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; the first condition set includes that a channel quality of the first cell is worse than a first threshold, the first cell is maintained by the second node; and a time alignment timer associated with a timing advance group to which the second cell belongs is not running;

[0454] or,

[0455] The first transceiver 1002 sends a first timing advance command on the second cell, wherein the first timing advance command is a MAC sublayer message; wherein a first RRC signaling is received, the first RRC signaling indicates the second cell and the configuration of the second cell, and the second cell is a switching candidate cell; whether a first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell is applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is used to send the first RRC signaling; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

[0456] As an embodiment, the second node includes the second transmitter 1001 and the first transceiver 1002.

[0457] As an embodiment, sending the first timing advance command on the second cell includes sending PDSCH; wherein the time-frequency resource block occupied by the PDSCH is indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

[0458] As an embodiment, sending the first timing advance command on the second cell includes sending PDSCH; wherein the time-frequency resource blocks occupied by the PDSCH are indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation; the first downlink allocation indicates periodic time-frequency resource blocks.

[0459] As an embodiment, the first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink reception in any cell included in the timing advance group; wherein the uplink reception includes receiving a first random access sequence, or the uplink reception includes receiving PUSCH on a time-frequency resource block indicated by the configuration grant.

[0460] As an embodiment, the first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink reception in any cell included in the timing advance group; wherein the uplink reception includes receiving a first random access sequence, or the uplink reception includes receiving PUSCH on a time-frequency resource block indicated by a configuration grant; the first transceiver 1002, as a response to the first RRC signaling being received, receives the first random access sequence; wherein the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for receiving the first random access sequence; the at least partial configuration of the second cell being applied includes: the configuration of the second cell except the configuration for random access is applied.

[0461] As an embodiment, the second transmitter 1001 sends the first timing advance command on the first cell before the first condition set for the second cell is met.

[0462] As an embodiment, the second transmitter 1001 sends the first timing advance command on the first cell before the first condition set for the second cell is met; sending the first timing advance command on the first cell includes sending PDCCH; wherein the PDSCH scheduled by the PDCCH is used to send the first timing advance command.

[0463] As an embodiment, the second transmitter 1001 includes the attached Figure 4 The transmitter 418 (including antenna 420), transmit processor 416, multi-antenna transmit processor 471 and controller / processor 475.

[0464] As an embodiment, the second transmitter 1001 includes the attached Figure 4 At least one of the transmitter 418 (including antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475.

[0465] As an embodiment, the first transceiver 1002 includes Figure 4 The transmitter 418 (including antenna 420), transmit processor 416, multi-antenna transmit processor 471 and controller / processor 475.

[0466] As an embodiment, the first transceiver 1002 includes Figure 4 At least one of the transmitter 418 (including antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475.

[0467] As an embodiment, the first transceiver 1002 includes Figure 4 The receiver 418 (including antenna 420), receive processor 470, multi-antenna receive processor 472 and controller / processor 475.

[0468] As an embodiment, the first transceiver 1002 includes Figure 4 At least one of the receiver 418 (including the antenna 420), the receive processor 470, the multi-antenna receive processor 472 or the controller / processor 475.

[0469] A person of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of software and hardware combination. The first type of communication node or UE or terminal in the present application includes but is not limited to mobile phones, tablet computers, notebooks, Internet cards, low-power devices, eMTC (enhanced Machine Type Communication, enhanced machine type communication) equipment, NB-IoT equipment, vehicle-mounted communication equipment, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication equipment. The second type of communication node or base station or network side equipment in the present application includes but is not limited to macrocellular base stations, microcellular base stations, home base stations, relay base stations, eNB, gNB, transmission and reception nodes TRP (Transmission and Reception Point, transmission and reception point), relay satellites, satellite base stations, aerial base stations and other wireless communication equipment.

[0470] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A first node used for wireless communication, characterized in that: include: A first receiver receives a first RRC signaling, and evaluates whether a first condition set for a second cell is satisfied, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, and the second cell is a handover candidate cell; The first receiver, when the first condition set for the second cell is satisfied, starts to apply at least part of the configuration of the second cell, and triggers monitoring of a first timing advance command on the second cell, where the first timing advance command is a MAC sublayer message; The first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; and the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

2. The first node according to claim 1, characterized in that: Monitoring the first timing advance command on the second cell includes monitoring a PDSCH; The time-frequency resource block occupied by the PDSCH is indicated by a first downlink allocation, and the first RRC signaling configures the first downlink allocation.

3. The first node according to claim 2, characterized in that: The first downlink allocation indicates a periodic time-frequency resource block.

4. The first node according to any one of claims 1 to 3, characterized in that: The first timing advance command is applied to the timing advance group, and the first timing advance command depends on uplink transmission of any cell included in the timing advance group; The uplink sending includes sending a first random access sequence, or the uplink sending includes sending a PUSCH on a time-frequency resource block indicated by the configuration grant.

5. The first node according to claim 4, characterized in that: include: A first transmitter sends the first random access sequence in response to receiving the first RRC signaling; Among them, the configuration of the second cell includes a configuration for random access, and the configuration for random access includes air interface resources for sending the first random access sequence; the starting application of at least part of the configuration of the second cell includes: starting to apply the configuration of the second cell except the configuration for random access.

6. The first node according to any one of claims 1 to 5, characterized in that: include: The first receiver monitors the first timing advance command on the first cell before the first condition set for the second cell is satisfied.

7. The first node according to any one of claims 1 to 6, characterized in that: Monitoring the first timing advance command on the first cell includes monitoring a PDCCH; The PDSCH scheduled by the PDCCH is used to send the first timing advance command.

8. A second node used for wireless communication, characterized in that: include: A second transmitter sends a first RRC signaling, where the first RRC signaling indicates a second cell and a configuration of the second cell, where the second cell is a handover candidate cell; Wherein, whether a first condition set for the second cell is satisfied is evaluated; the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is applied, and is triggered to monitor a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; the first condition set includes that a channel quality of the first cell is worse than a first threshold, and the first cell is maintained by the second node; a time alignment timer associated with a timing advance group to which the second cell belongs is not running; or, A first transceiver sends a first timing advance command on a second cell, wherein the first timing advance command is a MAC sublayer message; Among them, a first RRC signaling is received, the first RRC signaling indicates the second cell and the configuration of the second cell, and the second cell is a switching candidate cell; whether a first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell is applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is used to send the first RRC signaling; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

9. The second node according to claim 8, characterized in that: The second node includes the second transmitter and the first transceiver.

10. A method in a first node for wireless communication, characterized in that: include: receiving a first RRC signaling, and evaluating whether a first condition set for a second cell is satisfied, wherein the first RRC signaling indicates a second cell and a configuration of the second cell, and the second cell is a handover candidate cell; The first condition set for the second cell is met, at least part of the configuration of the second cell is started to be applied, and monitoring of a first timing advance command on the second cell is triggered, where the first timing advance command is a MAC sublayer message; The first condition set includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; and the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

11. A method in a second node for wireless communication, characterized in that: include: Sending a first RRC signaling, where the first RRC signaling indicates a second cell and a configuration of the second cell, where the second cell is a handover candidate cell; Wherein, whether a first condition set for the second cell is satisfied is evaluated; the first condition set for the second cell is satisfied, at least part of the configuration of the second cell is applied, and is triggered to monitor a first timing advance command on the second cell, the first timing advance command being a MAC sublayer message; the first condition set includes that a channel quality of the first cell is worse than a first threshold, and the first cell is maintained by the second node; a time alignment timer associated with a timing advance group to which the second cell belongs is not running; or, Sending a first timing advance command on the second cell, wherein the first timing advance command is a MAC sublayer message; Among them, a first RRC signaling is received, the first RRC signaling indicates the second cell and the configuration of the second cell, and the second cell is a switching candidate cell; whether a first condition set for the second cell is met is evaluated; the first condition set for the second cell is met, and at least part of the configuration of the second cell is applied; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is used to send the first RRC signaling; the time alignment timer associated with the timing advance group to which the second cell belongs is not running.

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