Method and device for wireless communication

Abstract

The present application discloses a method and device for wireless communication. The method comprises: as a response to a first condition set being satisfied, a first node sending a first random access sequence on a second cell; receiving first signaling on a first cell, the first signaling being layer-1 / layer-2 / layer-3 protocol layer signaling, and the first signaling instructing to hand over to the second cell; and sending a first wireless signal on the second cell, wherein the first random access sequence is used for triggering the first signaling, the first condition set comprises the channel quality of the first cell being less than a first threshold, the first signaling comprises a first timing advance command, and the first timing advance command is applied to the first wireless signal. The present application supports rapid cell handover, thereby reducing handover delay.

Description

A method and device for wireless communication Technical Field

[0001] The present application relates to methods and devices in wireless communication systems, and more particularly to methods and devices for performing cell switching in wireless communication. Background Art

[0002] The application scenarios of future wireless communication systems are becoming increasingly diverse, and different scenarios place varying performance requirements on the systems. To meet these diverse performance demands, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) plenary meeting #72 decided to conduct research on New Radio (NR) (or 5G). The 3GPP RAN plenary meeting #75 approved the WI (Work Item) for New Radio, initiating standardization work on NR.

[0003] In new air interface technologies, cell handover is one of the most fundamental requirements. The fundamental requirement for cell handover is to reduce handover latency and minimize the impact on latency-sensitive services. To adapt to diverse application scenarios and meet different requirements, 3GPP has been evolving cell handover technology.

[0004] Summary of the Invention

[0005] When a user equipment (UE) moves from one cell's coverage area to another, it needs to change its serving cell, switching from a source cell to a target cell. Existing serving cell changes are typically triggered by Layer 3 (L3) measurements and implemented through RRC (Radio Resource Control) signaling, including reconfiguration with synchronization. However, implementing serving cell changes at L3 can be characterized by long latency, high signaling overhead, and prolonged interruption. In order 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 mobility enhancement technology based on L1 / L2 (Layer 1 / Layer 2). The design goal of the mobility enhancement technology based on L1 / L2 is to achieve fast switching of UE serving cells. In response to the demand for mobility enhancement based on L1 / L2 in the NR system, the present application discloses a solution. In the absence of conflicts, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Furthermore, although the original intention of the present application is for the Uu air interface, the present application can also be used for the PC5 port. Furthermore, although the original intention of the present application is for the terminal and base station scenario, the present application is also applicable to other scenarios facing similar problems, but the present application is also applicable to V2X (Vehicle-to-Everything, Internet of Vehicles) scenarios, communication scenarios between terminals and relays, and relays and base stations, to achieve similar technical effects in terminal and base station scenarios. 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) can also help reduce hardware complexity and costs.In particular, the interpretation of terminology, nouns, functions, and variables in this application (unless otherwise specified) may refer to the definitions in the 3GPP specification protocols TS38 series and TS37 series.

[0006] The present application discloses a method in a first node used for wireless communication, characterized by comprising:

[0007] In response to the first set of conditions being met, sending a first random access sequence on the second cell;

[0008] receiving a first signaling on the first cell, where the first signaling is protocol layer signaling below layer 3, and the first signaling indicates handover to the second cell;

[0009] Sending a first wireless signal on the second cell;

[0010] The first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

[0011] As an embodiment, the first cell is a serving cell, and the second cell is a handover candidate cell.

[0012] As an embodiment, the above method can implement cell switching triggered by UE.

[0013] As an embodiment, the above method can effectively support the demand for fast cell switching caused by rapid channel changes and reduce service interruption time.

[0014] As an embodiment, the above method maintains communication with the first cell after sending the first random access sequence, and instructs cell switching through the first signaling, thereby avoiding wasting air interface resources of the first cell.

[0015] As an embodiment, the above method can reduce the switching delay by sending the switching command through the protocol layer below layer 3.

[0016] As an embodiment, the above method reduces the switching delay by carrying the first timing advance command in the first signaling.

[0017] As an embodiment, the above method receives the first timing advance command in the first cell, which can reduce the UE hardware cost.

[0018] As an embodiment, the present application is particularly applicable to mobility enhancement scenarios.

[0019] As an embodiment, the problem to be solved by the present application is: before receiving a cell switching command, when the UE detects that a cell switching condition is met, how to support cell switching triggered by the UE.

[0020] As an embodiment, the solution of the present application is: when the first condition set is met, the UE initiates cell switching preparation by sending the first random access sequence in the second cell, and performs cell switching after receiving the cell switching command in the first cell.

[0021] As an embodiment, in the above method, the first node rather than the base station of the serving cell of the first node triggers the sending of the first random access sequence, which can further speed up the cell switching process.

[0022] According to one aspect of the present application, the invention comprises:

[0023] receiving a first RRC signaling, where the first RRC signaling configures a candidate cell set, and the second cell belongs to the candidate cell set; and after receiving the first RRC signaling, starting to evaluate whether the first condition set is satisfied;

[0024] The first RRC signaling indicates the first random access sequence.

[0025] According to one aspect of the present application, the invention comprises:

[0026] When the stored candidate cell configuration for the second cell is applied, starting a first timer;

[0027] The first timer is maintained at a higher layer; and the reception time of the first signaling is later than the start time of the first timer.

[0028] According to one aspect of the present application, the invention comprises:

[0029] receiving an indication from a lower layer that a cell handover is triggered; and starting or restarting a second timer in response to receiving the indication that the cell handover is triggered;

[0030] The lower layer is a protocol layer below layer 3.

[0031] According to one aspect of the present application, the invention comprises:

[0032] At least one of the first timer or the second timer is running when the first wireless signal is sent;

[0033] The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

[0034] As an embodiment, the above method is compatible with cell switching triggered by UE and cell switching triggered by the network.

[0035] According to one aspect of the present application, the invention comprises:

[0036] The first timer is running when the first wireless signal is sent;

[0037] The second timer and the first timer are the same timer; and the first timer is restarted in response to receiving the indication that the cell handover is triggered.

[0038] As an embodiment, the above method can simplify UE costs.

[0039] According to one aspect of the present application, the invention comprises:

[0040] The second timer is running when the first wireless signal is sent;

[0041] In which, as a response to receiving the indication that the cell handover is triggered, the second timer is started and the first timer is stopped.

[0042] As an embodiment, the above method can simplify UE implementation.

[0043] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0044] Receiving a first random access sequence on a second cell, where a first condition set is satisfied and is used to trigger the first random access sequence; receiving a first wireless signal on the second cell;

[0045] The first random access sequence is used to trigger first signaling, the first signaling is transmitted on the first cell; the first signaling is protocol layer signaling below Layer 3, and the first signaling indicates handover to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal;

[0046] or,

[0047] Sending first signaling on the first cell, where the first signaling is protocol layer signaling below layer 3, and the first signaling indicates handover to the second cell;

[0048] In which, a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied and is used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, the first timing advance command is applied to a first wireless signal, and the first wireless signal is transmitted on the second cell.

[0049] As an embodiment, the above method is applicable to a scenario where the second node is a base station of the first cell.

[0050] As an embodiment, the above method is applicable to a scenario where the second node is a base station of the second cell.

[0051] As an embodiment, the above method is applicable to a scenario where the second node is both a base station of the first cell and a base station of the second cell.

[0052] According to one aspect of the present application, the invention comprises:

[0053] The behavior comprises receiving a first random access sequence on a second cell, wherein a first condition set is satisfied and is used to trigger the first random access sequence; receiving a first radio signal on the second cell; wherein the first random access sequence is used to trigger first signaling, and the first signaling is transmitted on the first cell; the first signaling is protocol layer signaling below layer 3, and the first signaling indicates handover to the second cell; the first condition set includes that a channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first radio signal;

[0054] and

[0055] The behavior includes sending first signaling on a first cell, where the first signaling is protocol layer signaling below layer 3, and the first signaling indicates handover to a second cell; wherein a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied to trigger the first random access sequence; the first condition set includes that a channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, the first timing advance command is applied to a first radio signal, and the first radio signal is transmitted on the second cell;

[0056] Both of the above actions are performed.

[0057] As an embodiment, the above method is applicable to a scenario where the second node is both a base station of the first cell and a base station of the second cell.

[0058] According to one aspect of the present application, the invention comprises:

[0059] sending a first RRC signaling, where the first RRC signaling configures a candidate cell set, and the second cell belongs to the candidate cell set;

[0060] After the first RRC signaling is received, whether the first condition set is satisfied is evaluated; and the first RRC signaling indicates the first random access sequence.

[0061] As an embodiment, the above method is applicable to a scenario where the second node is a base station of the first cell.

[0062] According to one aspect of the present application, the invention comprises:

[0063] When the stored candidate cell configuration for the second cell is applied, a first timer is started;

[0064] The first timer is maintained at a higher layer; and the sending time of the first signaling is later than the start time of the first timer.

[0065] According to one aspect of the present application, the invention comprises:

[0066] An indication that a cell handover is triggered is received from a lower layer; a second timer is started or restarted in response to the indication that the cell handover is triggered being received;

[0067] The lower layer is a protocol layer below layer 3.

[0068] According to one aspect of the present application, the invention comprises:

[0069] At least one of the first timer or the second timer is running when the first wireless signal is sent;

[0070] The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

[0071] According to one aspect of the present application, the invention comprises:

[0072] The first timer is running when the first wireless signal is sent;

[0073] The second timer and the first timer are the same timer; and the first timer is restarted in response to receiving the indication that the cell handover is triggered.

[0074] According to one aspect of the present application, the invention comprises:

[0075] the second timer is running when the first wireless signal is sent;

[0076] In which, as a response to receiving the indication that the cell handover is triggered, the second timer is started and the first timer is stopped.

[0077] The present application discloses a first node used for wireless communication, characterized by comprising:

[0078] The first transmitter transmits a first random access sequence on the second cell in response to the first set of conditions being satisfied;

[0079] A first receiver receives first signaling on a first cell, where the first signaling is protocol layer signaling below layer 3, and the first signaling indicates handover to the second cell;

[0080] The first transmitter sends a first wireless signal on the second cell;

[0081] The first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

[0082] The present application discloses a second node used for wireless communication, characterized by comprising:

[0083] A second receiver receives a first random access sequence on a second cell, wherein a first condition set is satisfied and is used to trigger the first random access sequence; and receives a first wireless signal on the second cell;

[0084] The first random access sequence is used to trigger first signaling, the first signaling is transmitted on the first cell; the first signaling is protocol layer signaling below Layer 3, and the first signaling indicates handover to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal;

[0085] or,

[0086] The second transmitter sends a first signaling on the first cell, where the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates handover to the second cell;

[0087] In which, a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied and is used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, the first timing advance command is applied to a first wireless signal, and the first wireless signal is transmitted on the second cell.

[0088] As an embodiment, the second node is a base station of the first cell.

[0089] As an embodiment, the second node is a base station of the second cell.

[0090] As an embodiment, the second node is both the base station of the first cell and the base station of the second cell.

[0091] According to one aspect of the present application, the invention comprises:

[0092] The second node includes the second receiver and the second transmitter.

[0093] As an embodiment, the second node is both the base station of the first cell and the base station of the second cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0095] FIG1 illustrates a flow chart of signal processing in a first node according to an embodiment of the present application;

[0096] FIG2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application;

[0097] FIG3 illustrates a schematic diagram of a radio protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0098] FIG4 illustrates a schematic diagram of hardware modules of a communication device according to an embodiment of the present application;

[0099] FIG5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application;

[0100] FIG6 illustrates a schematic diagram related to a first timer according to an embodiment of the present application;

[0101] FIG7 illustrates a flowchart related to a second timer according to one embodiment of the present application;

[0102] FIG8 illustrates a schematic diagram of the relationship between a first timer, a second timer, and a first wireless signal according to an embodiment of the present application;

[0103] FIG9 illustrates a schematic diagram of the relationship between a first timer and a second timer according to an embodiment of the present application;

[0104] FIG10 illustrates a schematic diagram of the relationship between a first timer and a second timer according to an embodiment of the present application;

[0105] FIG11 illustrates a flowchart of the operation of a first timer according to one embodiment of the present application;

[0106] FIG12 illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application;

[0107] FIG13 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application. DETAILED DESCRIPTION

[0108] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

[0109] Example 1

[0110] Embodiment 1 illustrates a signal processing flow chart in a first node according to an embodiment of the present application, as shown in FIG1 .

[0111] In embodiment 1, the first node 100 sends a first random access sequence on the second cell in response to the first condition set being satisfied in step 101; receives first signaling on the first cell in step 102, wherein the first signaling is protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; sends a first wireless signal on the second cell in step 103; wherein the first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

[0112] As an embodiment, in response to the first set of conditions being met, a first random access sequence is sent on the second cell.

[0113] As an embodiment, the first condition set being satisfied means that all conditions in the first condition set are satisfied.

[0114] As an embodiment, the first condition set includes at least one condition.

[0115] As an embodiment, the first condition set includes conditions for performing cell switching configured by the source base station of the first node.

[0116] As a sub-embodiment of the above embodiment, the cell switching is performed at a protocol layer below layer 3.

[0117] As a sub-embodiment of the above embodiment, the cell switching is performed in a MAC (Medium Access Control) sublayer.

[0118] As a sub-embodiment of the above embodiment, the cell switching is performed at the physical layer.

[0119] As an embodiment, the first condition set includes that the channel quality of the first cell is worse than a first threshold.

[0120] As an embodiment, the first threshold is a measurement value.

[0121] As an embodiment, the first threshold is a configuration value.

[0122] As an embodiment, the first threshold is a value obtained by linearly processing the measured value and the configured value.

[0123] As an embodiment, the first condition set includes one condition, wherein 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.

[0124] 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 the second threshold; wherein the first threshold is configured by the network and the second threshold is configured by the network.

[0125] As an embodiment, when the channel quality of a cell is less than a threshold, the channel quality of the cell is worse than the threshold.

[0126] As an embodiment, when the channel quality of a cell is greater than a threshold, the channel quality of the cell is better than the threshold.

[0127] 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).

[0128] As an embodiment, the channel quality of a cell is obtained by measuring a reference signal of the cell.

[0129] As an embodiment, the cell measurement is performed at protocol layers below L3.

[0130] As an embodiment, the cell measurement is performed at L1.

[0131] As an embodiment, the reference signal is an SSB (Synchronization Signal Block).

[0132] As an embodiment, the reference signal is a CSI-RS (Channel Status Information-Reference Signal).

[0133] As an embodiment, the reference signal SSB (Synchronization Signals / Physical Broadcast Channel).

[0134] 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.

[0135] 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 an event hysteresis parameter value.

[0136] As an example, that the channel quality of the first cell is worse than the first threshold includes: Mp < Mn; where, the Mp is the channel quality of the first cell; the first threshold is the Mn, and the Mn is the channel quality of the second cell.

[0137] As an example, that the channel quality of the first cell is worse than the first threshold includes: Mp < Thresh1; where, the Mp is the channel quality of the first cell; the first threshold is the Thresh1, and the Thresh1 is configured.

[0138] As an example, that the channel quality of the second cell is better than the second threshold includes: Mn > Thresh2; where, the Mn is the channel quality of the second cell; the second threshold is the Thresh2, and the Thresh2 is configured.

[0139] As an example, that the channel quality of the first cell is 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; the Mp is the result measured for the first cell; the Ofp is the offset value dedicated to the measurement object for the first cell; the Ocp is the cell-specific offset value for the first cell; the Off is the offset value for the event; the Mn is the result measured for the second cell; the Ofn is the offset value dedicated to the measurement object for the second cell; the Ocn is the cell-specific offset value for the second cell; the Hys is the hysteresis parameter value for the event; when the Mp and the Mn are RSRP (Reference Signal Received Power), the units of the Mp and the Mn are dBm (decibel milliwatt); when the Mp and the Mn are RSRQ (Reference Signal Received Quality) or RS-SINR (Reference Signal-Signal to Interference&Noise Ratio), the units of the Mp and the Mn are dB (decibel); the units of the Ofn, the Ocn, the Ofp, the Ocp, the Hys and the Off are dB.

[0140] As an example, the channel quality of the first cell being 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; Thresh1 is configured.

[0141] As an example, the channel quality of the second cell being 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; Thresh2 is configured.

[0142] 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 the unit of Mp; the unit of Threshold2 is the same as the unit of Mn.

[0143] As an example, the first random access sequence is a characteristic sequence.

[0144] As an example, the first random access sequence is a Gold sequence.

[0145] As an example, the first random access sequence is an M sequence.

[0146] As an example, the first random access sequence is a ZC (Zadoff–Chu) sequence.

[0147] As an example, the first random access sequence is dedicated to the first node.

[0148] As an example, the first random access sequence is sent through the PRACH (Physical Random Access CHannel).

[0149] As an embodiment, the first random access sequence is sent on the second cell, and the random access process to which the first random access sequence belongs is completed.

[0150] As an embodiment, the second cell is not a serving cell of the first node.

[0151] As an embodiment, after receiving the first random access sequence from the second cell, the base station to which the second cell belongs can obtain the target timing advance value of the sender of the first random access sequence, and the target timing advance value is applied to the uplink transmission on the second cell.

[0152] As an embodiment, the first node does not monitor a RAR (random access response) on the second cell after sending the first random access sequence on the second cell.

[0153] As an embodiment, the above method can reduce the communication interruption time between the first node and the serving cell, and the serving cell includes the first cell.

[0154] As an embodiment, a first signaling is received on a first cell, where the first signaling is protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell.

[0155] As an embodiment, the first cell is a service cell of the first node.

[0156] As an embodiment, the first cell is a SpCell (Special Cell).

[0157] As an embodiment, the first cell is a PCell (Primary Cell).

[0158] As an embodiment, the protocol layers below layer 3 include a MAC sublayer and a physical layer.

[0159] As an embodiment, the first signaling is MAC CE (Control Element).

[0160] As a sub-embodiment of the above embodiment, the code point value of the eLCID corresponding to the first signaling is 225.

[0161] As a sub-embodiment of the above embodiment, the index value of the eLCID corresponding to the first signaling is 289.

[0162] As an embodiment, the first signaling is physical layer signaling.

[0163] As an embodiment, the first signaling is a physical layer signal.

[0164] As an embodiment, the first signaling indicates cell switching.

[0165] As an embodiment, the first signaling is LTM (L1 / L2-triggered mobility) Cell Switch Command.

[0166] As an embodiment, the first signaling indicates the second cell.

[0167] As an embodiment, the first signaling implicitly indicates the second cell.

[0168] As an embodiment, the first signaling includes a first timing advance command (TAC).

[0169] As an embodiment, the first timing advance command is for the second cell.

[0170] As an embodiment, the first timing advance command is applied to a TAG (timing advance group) to which the second cell belongs.

[0171] As an embodiment, the first timing advance command is used for uplink synchronization of the first node and the second cell.

[0172] As an embodiment, the first timing advance command is used for uplink synchronization when the first node performs uplink transmission on the second cell.

[0173] As an embodiment, the first timing advance command is valid.

[0174] As an embodiment, the value of the first timing advance command does not include the hexadecimal number FFF.

[0175] As an embodiment, the first random access sequence is used to trigger the first signaling.

[0176] As an embodiment, the first random access sequence is used to trigger the first signaling, which means that the first signaling depends on the first random access sequence.

[0177] As an embodiment, the first random access sequence is used to trigger the first signaling, which means that the first signaling is a response to the first random access sequence.

[0178] As an embodiment, the fact that the first random access sequence is used to trigger the first signaling means that the sending of the first signaling must be caused by the sending of the first random access sequence.

[0179] As an embodiment, the first random access sequence is used to trigger the first signaling, including: the first random access sequence is used to generate the first timing advance command, and the first timing advance command is used to trigger the first signaling.

[0180] As an embodiment, a first wireless signal is sent on the second cell.

[0181] As an embodiment, the first wireless signal is triggered by the first signaling.

[0182] As an embodiment, the first wireless signal is sent via PUCCH (Physical Uplink Control Channel).

[0183] As an embodiment, the first wireless signal is sent through a PUSCH (Physical Uplink Shared Channel).

[0184] As an embodiment, the first wireless signal is a reference signal.

[0185] As an embodiment, the first wireless signal is an SRS (Sounding Reference Signal).

[0186] As an embodiment, the first wireless signal is not sent through PRACH.

[0187] As an embodiment, the first wireless signal is sent first after receiving the first signaling.

[0188] As an embodiment, the air interface resources occupied by the first wireless signal are indicated by the first signaling.

[0189] As an embodiment, the air interface resources occupied by the first wireless signal are pre-configured.

[0190] As an embodiment, the air interface resources occupied by the first wireless signal belong to an uplink configured grant.

[0191] As an embodiment, the air interface resources include at least one of time domain resources, frequency domain resources, code domain resources or space resources.

[0192] As an embodiment, the first timing advance command is applied to the first wireless signal.

[0193] As an embodiment, the first timing advance command is applied to the first wireless signal, including: the first timing advance command is used to determine a target timing advance value, and the target timing advance value is the advance value of the starting time of the uplink time unit for sending the first wireless signal relative to the corresponding downlink time unit.

[0194] As a sub-embodiment of the above embodiment, the time unit is a frame, a subframe or a time slot.

[0195] As an embodiment, the first node obtains the downlink synchronization of the second cell according to the downlink synchronization signal; determines the target timing advance value as t according to the first timing advance command; if the uplink transmission time slot of the first wireless signal is n, the first node starts sending the first wireless signal at a time t before the start time of the corresponding downlink time slot n.

[0196] As an embodiment, the first timing advance command includes 12 bits, and the first timing advance command indicates the target timing advance value.

[0197] As an embodiment, the target timing advance value is related to the subcarrier of the first uplink transmission on the second cell after the first signaling is received.

[0198] As an embodiment, the target timing advance value is related to the subcarrier spacing of the first wireless signal.

[0199] As an embodiment, the target timing advance value NTA=TA·16·64 / 2μ; wherein TA is the index included in the first timing advance command, and the 2 μ ·15 kHz (kilohertz) is the subcarrier spacing (SCS) of the second cell.

[0200] As an embodiment, the T A A positive integer less than 4096.

[0201] As an embodiment, the T A The value of is 0,1,2,...,3846.

[0202] As an embodiment, μ is a positive integer not greater than 10.

[0203] As an embodiment, the value of μ is 0, 1, 2, 3, 4, 5, or 6.

[0204] Example 2

[0205] Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in FIG2 . FIG2 illustrates a diagram of a network architecture 200 for NR 5G, LTE (Long-Term Evolution), and LTE-A (Long-Term Evolution Advanced) systems. 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 appropriate terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, an NG-RAN (Next Generation Radio Access Network) 202, a 5G Core Network (5GC) / EPC (Evolved Packet Core) 210, an HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet services 230. The 5GS / EPS may interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As shown, the 5GS / EPS provides packet-switched services, but those skilled in the art will readily appreciate that the various concepts presented herein can be extended to networks providing circuit-switched services or other cellular networks. The NG-RAN includes an NR Node B (gNB) 203 and other gNBs 204. The gNB 203 provides user and control plane protocol termination towards the UE 201. The gNB 203 may connect to other gNBs 204 via an Xn interface (e.g., backhaul). The gNB 203 may also be referred to as a base station, base transceiver station, radio base station, radio transceiver, transceiver functionality, Basic Service Set (BSS), Extended Service Set (ESS), Transmission Reception Point (TRP), or some other appropriate terminology. In a non-terrestrial / satellite network (NTN), the gNB 203 may be a satellite, an aircraft, or a terrestrial base station relayed via a satellite. The gNB 203 provides an access point to the 5GC / EPC 210 for the UE 201.Examples of UE 201 include a cellular phone, a smartphone, a Session Initiation Protocol (SIP) phone, a laptop computer, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a drone, an aircraft, a narrowband Internet of Things device, a machine type communication device, a land vehicle, an automobile, an in-vehicle device, an in-vehicle communication unit, a wearable device, or any other similarly functional device. 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 terminology. The gNB 203 connects to the 5GC / EPC 210 via the S1 / NG interface. The 5GC / EPC 210 includes the MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MMEs / AMFs / SMFs 214, the S-GW (Service Gateway) / UPF (User Plane Function) 212, and the P-GW (Packet Data Network Gateway) / UPF 213. The MME / AMF / SMF 211 is the control node that handles signaling between the UE 201 and the 5GC / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through the S-GW / UPF 212, which itself is connected to the P-GW / UPF 213. The P-GW provides UE IP address allocation and other functions. The P-GW / UPF 213 is connected to Internet Services 230. Internet Services 230 includes operator-specific Internet Protocol services, which may include Internet, Intranet, IMS (IP Multimedia Subsystem), and PS (Packet Switching) streaming services.

[0206] As an embodiment, the UE201 corresponds to the first node in this application.

[0207] As an embodiment, the NR node B203 corresponds to the second node in this application.

[0208] As an embodiment, the gNB203 is a macro cell base station.

[0209] As an embodiment, the gNB203 is a micro cell base station.

[0210] As an embodiment, the gNB203 is a pico cell base station.

[0211] As an embodiment, the gNB203 is a home base station (Femtocell).

[0212] As an embodiment, the gNB203 is a base station device that supports large delay difference.

[0213] As an embodiment, the gNB203 is a flying platform device.

[0214] As an embodiment, the gNB203 is a satellite device.

[0215] As an embodiment, the gNB203 is a test device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0216] As an embodiment, the other gNB204 is a macro cell base station.

[0217] As an embodiment, the other gNB204 is a micro cell base station.

[0218] As an embodiment, the other gNB204 is a pico cell base station.

[0219] As an embodiment, the other gNB204 is a home base station (Femtocell).

[0220] As an embodiment, the other gNB204 is a base station device that supports large delay difference.

[0221] As an embodiment, the other gNB204 is a flying platform device.

[0222] As an embodiment, the other gNB204 is a satellite device.

[0223] As an embodiment, the other gNB204 is a test device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0224] As an embodiment, the wireless link from the UE201 to the gNB203 is an uplink, and the uplink is used to perform uplink transmission.

[0225] As an embodiment, the wireless link from the gNB203 to the UE201 is a downlink, and the downlink is used to perform downlink transmission.

[0226] As an embodiment, the UE201 and the gNB203 are connected via a Uu interface.

[0227] Example 3

[0228] Embodiment 3 illustrates a schematic diagram of the radio protocol architecture for the user plane and control plane according to one embodiment of the present application, as shown in FIG3 . FIG3 is a schematic diagram illustrating an embodiment of the radio protocol architecture for the user plane 350 and control plane 300. FIG3 illustrates the radio protocol architecture for the control plane 300 of the UE and gNB using three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to herein as PHY 301. Layer 2 (L2) 305, located above PHY 301, is responsible for the link between the UE and gNB via PHY 301. L2 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. These sublayers terminate at the gNB on the network side. The PDCP sublayer 304 provides data encryption and integrity protection and also supports UE mobility between gNBs. The RLC sublayer 303 provides packet segmentation and reassembly, enabling retransmission of lost packets through ARQ. The RLC sublayer 303 also provides duplicate 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) within a cell between UEs. It is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3) of the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring 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 PC5QoS parameter group and QoS rules based on the received service data or service request, generating a PC5QoS flow corresponding to the PC5QoS parameter group, and sending the PC5QoS 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 PC5QoS 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 radio protocol architecture of the user plane 350 includes Layer 1 (L1) and Layer 2 (L2). The radio protocol architecture in the user plane 350 is generally identical to the corresponding layers and sublayers in the control plane 300, including the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355. However, the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 also includes the SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping QoS (Quality of Service) flows to data radio bearers (DRBs) to support service diversity. The wireless protocol architecture of the UE in the user plane 350 may include, at the L2 layer, the SDAP sublayer 356, the PDCP sublayer 354, some 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.).

[0229] As an embodiment, the wireless protocol architecture in FIG3 is applicable to the first node in this application.

[0230] As an embodiment, the wireless protocol architecture in FIG3 is applicable to the second node in this application.

[0231] As an embodiment, the first random access sequence in the present application is generated in the PHY301 or the PHY351.

[0232] As an embodiment, the first signaling in the present application is generated by the MAC302 or the MAC352.

[0233] As an embodiment, the first signaling in the present application is generated in the PHY301 or the PHY351.

[0234] As an embodiment, the first wireless signal in the present application is generated by the PHY301 or the PHY351.

[0235] As an embodiment, the first RRC signaling in this application is generated in the RRC306.

[0236] As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

[0237] Example 4

[0238] Embodiment 4 illustrates a hardware module diagram of a communication device according to an embodiment of the present application, as shown in FIG4. FIG4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0239] 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 .

[0240] 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 .

[0241] During transmission from the second communications device 410 to the first communications device 450, at the second communications device 410, upper layer data packets from the core network or from a data source 477 are provided to a controller / processor 475. The core network and data source 477 represent all protocol layers above the L2 layer. The controller / processor 475 implements L2 layer functionality. During transmission from the second communications device 410 to the first communications 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 communications device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets and signaling to the first communications 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), and M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming 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 and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying the time-domain multicarrier symbol stream. The multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier 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.

[0242] During 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 via 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, which is provided to the receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various L1 signal processing functions. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. The receive processor 456 converts the baseband multi-carrier symbol stream, after the receive analog precoding / beamforming operations, from the time domain to the frequency domain using a fast Fourier transform (FFT). In the frequency domain, the receive processor 456 demultiplexes the physical layer data signal and reference signal, where the reference signal is used for channel estimation. The data signal undergoes multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in the receive processor 456, and soft decisions are generated. The receive 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 code and data. The memory 460 may be referred to as a computer-readable medium. During transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and 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 layer for L3 processing.

[0243] During transmission from the first communications device 450 to the second communications device 410, upper layer data packets are provided to the controller / processor 459 at the first communications device 450 using a data source 467. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission functionality at the second communications device 410 described in the transmission from the second communications device 410 to the first communications device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, implementing L2 layer functions for both the user plane and the control plane. The controller / processor 459 is also responsible for retransmission of lost packets and signaling to the second communications device 410. The transmit processor 468 performs modulation mapping and channel coding, while the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming. The transmit processor 468 then modulates the resulting spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding and beamforming operations in the multi-antenna transmit processor 457, the stream is provided to different antennas 452 via the transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a RF symbol stream before providing it to the antenna 452.

[0244] During transmission from the first communication device 450 to the second communication device 410, the functionality at the second communication device 410 is similar to the reception functionality at the first communication device 450 described for transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives RF signals via its corresponding antenna 420, converts the received RF signals into baseband signals, and provides the baseband signals to the multi-antenna receive processor 472 and the receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 collectively implement the L1 layer functionality. The controller / processor 475 implements the L2 layer functionality. The controller / processor 475 may be associated with a memory 476 that stores program code and data. The memory 476 may be referred to as a computer-readable medium. During transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the first communication device 450. The controller / processor 475 may provide upper layer data packets to the core network or all protocol layers above the L2 layer, and may also provide various control signals to the core network or L3 for L3 processing.

[0245] 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: sends a first random access sequence on the second cell in response to a first set of conditions being satisfied; receives first signaling on the first cell, the first signaling being a protocol layer signaling below layer 3, the first signaling indicating switching to the second cell; sends a first wireless signal on the second cell; wherein the first random access sequence is used to trigger the first signaling, the first set of conditions including that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

[0246] As an embodiment, the first communication device 450 apparatus includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generating an action when executed by at least one processor, the action including: sending a first random access sequence on the second cell in response to a first set of conditions being satisfied; receiving a first signaling on the first cell, the first signaling being a protocol layer signaling below layer 3, the first signaling indicating switching to the second cell; sending a first wireless signal on the second cell; wherein the first random access sequence is used to trigger the first signaling, the first set of conditions including the channel quality of the first cell being worse than a first threshold; the first signaling including a first timing advance command, the first timing advance command being applied to the first wireless signal.

[0247] As an embodiment, the second communication device 410 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second communication device 410 device at least: receives a first random access sequence on the second cell, and a first condition set is satisfied and used to trigger the first random access sequence; receives a first wireless signal on the second cell; wherein the first random access sequence is used to trigger a first signaling, and the first signaling is transmitted on the first cell; the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal; or, sends a first signaling on the first cell, the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; wherein the first random access sequence is used to trigger the first signaling, and the first random access sequence is transmitted on the second cell, and the first condition set is satisfied and used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal, and the first wireless signal is transmitted on the second cell.

[0248] As an embodiment, the second communication device 410 device includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generates an action when executed by at least one processor, the action including: receiving a first random access sequence on the second cell, a first condition set being satisfied and being used to trigger the first random access sequence; receiving a first wireless signal on the second cell; wherein the first random access sequence is used to trigger a first signaling, the first signaling is transmitted on the first cell; the first signaling is a protocol layer signaling below layer 3, the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold ... A signaling includes a first timing advance command, which is applied to the first wireless signal; or, a first signaling is sent on a first cell, the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to a second cell; wherein, a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, the first timing advance command is applied to the first wireless signal, and the first wireless signal is transmitted on the second cell.

[0249] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0250] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0251] As an embodiment, the first communication device 450 is a UE.

[0252] As an embodiment, the first communication device 450 is a relay.

[0253] As an embodiment, the second communication device 410 is a base station device.

[0254] As an embodiment, the second communication device 410 is a distribution unit of a base station.

[0255] As an embodiment, the second communication device 410 is a piece of code in a distributed unit of a base station.

[0256] 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 this application.

[0257] 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 this application.

[0258] 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 transmit the first wireless signal in this application.

[0259] 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 wireless signal in this application.

[0260] 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 signaling in this application.

[0261] 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 signaling in this application.

[0262] 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 this application.

[0263] 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 this application.

[0264] Example 5

[0265] Example 5 illustrates a wireless signal transmission flow chart according to one embodiment of the present application, as shown in FIG5 . In FIG5 , a first node N51 and a second transmitter N52 communicate via a wireless interface, and a first node N51 and a second receiver N53 communicate via a wireless interface. It should be noted that the order in this example does not limit the signal transmission sequence and implementation order in this application.

[0266] For the first node N51, in step S511, a first RRC signaling is received; in step S512, it is determined that a first condition set is satisfied; in step S513, a first random access sequence is sent; in step S514, a first signaling is received; and in step S515, a first wireless signal is sent.

[0267] For the second transmitter N52, the first RRC signaling is sent in step S521; and the first signaling is sent in step S522.

[0268] For the second receiver N53, a first random access sequence is received in step S531; and a first wireless signal is received in step S532.

[0269] In Example 5, as a response to the first condition set being met, a first random access sequence is sent on the second cell; a first signaling is received on the first cell, the first signaling is protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; a first wireless signal is sent on the second cell; wherein the first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal; a first RRC signaling is received, the first RRC signaling is a candidate cell set configuration, and the second cell belongs to the candidate cell set; after receiving the first RRC signaling, start to evaluate whether the first condition set is met; wherein the first RRC signaling indicates the first random access sequence.

[0270] As an embodiment, the first node N51 and the second transmitter N52 communicate through the first cell.

[0271] As an embodiment, the first node N51 and the second receiver N53 communicate through the second cell.

[0272] As an embodiment, the second transmitter N52 and the second receiver N53 belong to the same base station.

[0273] As an embodiment, the second transmitter N52 and the second receiver N53 belong to different base stations.

[0274] As an embodiment, the second transmitter N52 and the second receiver N53 belong to the same gNB-DU (Distributed Unit).

[0275] As an embodiment, the second transmitter N52 and the second receiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with the same gNB-CU (Central Unit).

[0276] As an embodiment, the second transmitter N52 and the second receiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with two different gNB-CUs.

[0277] 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 one of the at least one gNB-DU through an F1 interface.

[0278] As an embodiment, the second transmitter N52 belongs to the base station of the first cell.

[0279] As an embodiment, the second receiver N53 belongs to the base station of the second cell.

[0280] As an embodiment, the base station of the first cell and the base station of the second cell are the same base station.

[0281] As an embodiment, the base station of the first cell and the base station of the second cell are different base stations.

[0282] As an embodiment, the second cell is a candidate cell of the first node.

[0283] As an embodiment, the second cell is an LTM candidate cell of the first node.

[0284] As an embodiment, a first RRC signaling is received.

[0285] As an embodiment, the first RRC signaling includes a candidate cell configuration IE (Information element).

[0286] As an embodiment, the first RRC signaling configures a candidate cell configuration for a candidate cell set.

[0287] As an embodiment, the first RRC signaling configures a candidate cell configuration for each candidate cell in the candidate cell set, and the candidate cell configuration is indicated by a configuration identifier.

[0288] As an embodiment, the candidate cell set is a CHO (Conditional Handover) candidate cell set.

[0289] As an embodiment, the candidate cell set is an LTM candidate cell set.

[0290] As an embodiment, the candidate cell configuration is a CHO candidate cell configuration.

[0291] As an embodiment, the candidate cell configuration is an LTM candidate cell configuration.

[0292] As an embodiment, the candidate cell configuration is a complete LTM candidate cell configuration.

[0293] As an embodiment, the candidate cell configuration is not a complete LTM candidate cell configuration.

[0294] As an embodiment, the first RRC signaling is RRCReconfiguration (RRC reconfiguration).

[0295] As an embodiment, the first RRC signaling includes condRRCReconfig (conditional RRC reconfiguration).

[0296] As an embodiment, the first RRC signaling includes ltm-ReferenceConfiguration (LTM reference configuration).

[0297] As an embodiment, the first RRC signaling includes LTM-Candidate (LTM candidate).

[0298] As an embodiment, the first RRC signaling includes ltm-CandidateConfig (LTM candidate configuration).

[0299] As an embodiment, the ltm-CandidateConfig included in the first RRC signaling configures the complete LTM candidate cell configuration for the LTM candidate cell set.

[0300] As an embodiment, the ltm-ReferenceConfiguration included in the first RRC signaling and the ltm-CandidateConfig included in the first RRC signaling together generate the complete LTM candidate cell configuration and configure it to the LTM candidate cell set.

[0301] As an embodiment, the first signaling includes a configuration identifier, and the candidate cell configuration indicated by the configuration identifier is applied to the second cell.

[0302] As an embodiment, the candidate cell set is configured according to the measurement report reported by the first node N51.

[0303] As an embodiment, the candidate cell set is configured by the second node.

[0304] As an embodiment, the candidate cell set is configured by the base station of the first cell.

[0305] As an embodiment, the second cell belongs to the candidate cell set.

[0306] As an embodiment, the candidate cell is used for cell switching.

[0307] As an embodiment, the candidate cell is used for CPC (Conditional PSCell Change, conditional primary SCG (Secondary Cell Group) cell change).

[0308] As an embodiment, the candidate cell is used for CPA (Conditional PSCell Addition, conditional SCG cell addition).

[0309] As an embodiment, the candidate cell is used for CHO.

[0310] As an embodiment, the candidate cell is used for cell exchange in protocol layers below layer 3.

[0311] As an embodiment, the candidate cell is used for LTM.

[0312] As an embodiment, the first RRC signaling indicates the second cell.

[0313] As an embodiment, the second cell is identified by a PhysCellId (physical cell identifier).

[0314] As an embodiment, the second cell is identified by a candidateCellID (candidate cell identifier).

[0315] As an embodiment, the first RRC signaling configures the candidate cell configuration for the second cell.

[0316] As an embodiment, the second cell is any cell in the candidate cell set configured for the first node; wherein the candidate cell set configured for the first node includes at least one cell.

[0317] As an embodiment, the first RRC signaling indicates the first random access sequence.

[0318] As a sub-embodiment of the above embodiment, the first RRC signaling includes an index of the first random access sequence (Random Access Preamble index).

[0319] As a sub-embodiment of the above embodiment, the first RRC signaling includes an identifier (random access preamble identifier, RAPID) of the first random access sequence.

[0320] As an embodiment, the first RRC signaling indicates the air interface resources for sending the first random access sequence.

[0321] As an embodiment, the first RRC signaling indicates the SSB (Synchronization Signals / Physical Broadcast Channel (SS / PBCH)) resources associated with the first random access sequence.

[0322] As an embodiment, the first RRC signaling indicates the first threshold.

[0323] As an embodiment, the first RRC signaling includes the first threshold.

[0324] As an embodiment, the first RRC signaling includes the second threshold.

[0325] As an embodiment, the first RRC signaling indicates the first condition set.

[0326] As an embodiment, the first RRC signaling configures an event in which conditional LTM is executed.

[0327] As an embodiment, after receiving the first RRC signaling, it starts to evaluate whether the first condition set is met.

[0328] As an embodiment, the phrase evaluating whether the first set of conditions is satisfied includes: performing channel measurement on each candidate cell in the candidate cell set to evaluate whether the first set of conditions is satisfied; wherein the second cell is any candidate cell in the candidate cell set.

[0329] As an embodiment, after receiving the first RRC signaling and before determining that the first condition set is met, the first node continues to perform a first operation set, and the first operation set includes at least one of monitoring PDCCH (physical downlink control channel) on the first cell, monitoring PDCCH used to schedule the first cell, and sending PRACH (physical random access channel) on the first cell.

[0330] As an embodiment, after receiving the first RRC signaling and before determining that the first condition set is met, the first node is in an RRC connected (RRC_connected) state.

[0331] 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 a backhaul network (backhaul), and sent to the first node through the first cell.

[0332] As a sub-embodiment of the above embodiment, the above method can reduce the communication interruption time with the first cell by not receiving the first timing advance command in the second cell.

[0333] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the candidate cell 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 through the first cell.

[0334] 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 random access sequence 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 through the first cell.

[0335] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the base station of the second cell determines the base station of the serving cell of the sender of the first random access sequence according to the received first random access sequence.

[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 air interface resources occupied by the first wireless signal are 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 by the base station of the first cell to the first node through the first cell.

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

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

[0339] Example 6

[0340] Embodiment 6 illustrates a schematic diagram related to a first timer according to an embodiment of the present application, as shown in FIG6. In embodiment 6, when the stored candidate cell configuration for the second cell is applied, the first timer is started.

[0341] As an embodiment, the first timer is started when the stored candidate cell configuration for the second cell is applied.

[0342] As an embodiment, after the first RRC signaling is received and before the first condition set is met, the candidate cell configuration included in the first RRC signaling is not applied.

[0343] As an embodiment, after the first RRC signaling is received, the candidate cell configuration included in the first RRC signaling is stored.

[0344] As an embodiment, the stored candidate cell configuration for the second cell being applied means that conditional reconfiguration for the second cell is performed.

[0345] As an embodiment, the stored candidate cell configuration for the second cell being applied means that conditional LTM for the second cell is executed.

[0346] As an embodiment, conditional reconfiguration is performed, which means that layer three cell switching is performed based on UE triggering.

[0347] As an embodiment, conditional LTM is performed, which means that LTM cell switching is performed based on UE triggering.

[0348] As an embodiment, the stored candidate cell configuration for the second cell is applied, which means that the first node switches to the second cell on its own.

[0349] As an embodiment, the stored candidate cell configuration for the second cell is applied, which means that the first node performs a handover of layers below layer 3 to the second cell on its own.

[0350] As an embodiment, the stored candidate cell configuration for the second cell is applied including: releasing the RRC configuration for the first cell.

[0351] As an embodiment, the stored candidate cell configuration for the second cell is applied, including: L2 of the first node is reset.

[0352] As an embodiment, when the first condition set is met, the stored candidate cell configuration for the second cell is applied.

[0353] As an embodiment, when the second cell is selected as a target cell for cell handover, the stored candidate cell configuration for the second cell is applied.

[0354] As an embodiment, starting the first timer includes: setting the value of the first timer to an initial value; wherein the initial value is 0, or the initial value is a first expiration value.

[0355] As an embodiment, the first expiration value is preconfigured.

[0356] As an embodiment, the first expiration value is network configured.

[0357] As an embodiment, the first expiration value is used to determine expiration of the first timer.

[0358] As an embodiment, the first timer is in a running state after being started.

[0359] As an embodiment, the first timer is maintained at a higher layer.

[0360] As a sub-embodiment of the above embodiment, the higher layer is the RRC layer, or the higher layer is L2.

[0361] As an embodiment, when the first timer is started, the first signaling has not yet been received.

[0362] As an embodiment, the reception time of the first signaling is later than the start time of the first timer.

[0363] As an embodiment, the first timer is used to monitor cell handover failure; wherein the cell handover is conditional LMT.

[0364] As an embodiment, when the cell switching is successful, the first timer is stopped.

[0365] As an embodiment, when the first wireless signal is successfully received by the second node, the cell switching is successful.

[0366] As an embodiment, when the first receiver receives the second wireless signal on the second cell, it determines that the first wireless signal is successfully received by the second node.

[0367] As an embodiment, the second wireless signal indicates that the first wireless signal is successfully decoded.

[0368] As an embodiment, the second wireless signal is used to schedule a new transmission; the new transmission is an uplink transmission, a downlink transmission, or a sidelink transmission.

[0369] As an embodiment, the second wireless signal is a PDSCH (Physical Downlink Shared CHannel).

[0370] As an embodiment, when the cell switching fails, the first node performs a cell selection process. If the selected cell does not belong to the candidate cell set, the first node initiates an RRC reconstruction process; if the selected cell belongs to the candidate cell set, the first node attempts to initiate the cell switching again.

[0371] Example 7

[0372] Example 7 illustrates a flowchart related to the second timer according to an embodiment of the present application, as shown in FIG7 .

[0373] In embodiment 7, in step S701 , an indication that a cell handover is triggered is received from a lower layer; in step S702 , a second timer is started or restarted.

[0374] As an embodiment, an indication that a cell handover is triggered is received from a lower layer.

[0375] As an embodiment, an indication that the cell handover is triggered is sent from a lower layer of the first node to a higher layer of the first node.

[0376] As a sub-embodiment of the above embodiment, the lower layer is a protocol layer below layer 3.

[0377] As a sub-embodiment of the above embodiment, the lower layer is a MAC sublayer.

[0378] As a sub-embodiment of the above embodiment, the lower layer is a physical layer.

[0379] As a sub-embodiment of the above embodiment, the higher layer is the RRC layer.

[0380] As an embodiment, the indication that the cell switching is triggered is an inter-layer interaction primitive.

[0381] As an embodiment, when receiving the first signaling, the lower layer of the first node indicates to the RRC layer of the first node that cell switching is triggered; wherein the lower layer is the MAC sublayer.

[0382] As an embodiment, in response to receiving the indication that the cell handover is triggered, a second timer is started or restarted.

[0383] As an embodiment, starting or restarting the second timer includes: setting the value of the second timer to an initial value; wherein the initial value is 0, or the initial value is a second expiration value.

[0384] As an embodiment, the second expiration value is preconfigured.

[0385] As an embodiment, the second expiration value is network configured.

[0386] As an embodiment, the second expiration value is used to determine the expiration of the second timer.

[0387] As an embodiment, the second timer is used to monitor cell switching failure; wherein the cell switching is an LTM triggered by the first signaling.

[0388] As an embodiment, when the cell switching is successful, the second timer is stopped.

[0389] As an embodiment, the second timer is maintained at a higher layer.

[0390] As an embodiment, the second timer is in a running state after being started.

[0391] Example 8

[0392] Example 8 illustrates a schematic diagram of the relationship between the first timer, the second timer and the first wireless signal according to an embodiment of the present application, as shown in Figure 8.

[0393] As an embodiment, the first timer and the second timer are two different timers.

[0394] As an embodiment, the operation of the second timer is independent of the operation of the first timer.

[0395] As an embodiment, the first wireless signal is sent when at least one of the first timer and the second timer is running.

[0396] As an embodiment, when both the first timer and the second timer expire, it is determined that the cell handover has failed.

[0397] As an embodiment, the first wireless signal is sent after the first signaling.

[0398] As an embodiment, the first wireless signal carries first uplink data (UL data).

[0399] As an embodiment, the uplink data carried by the first wireless signal is the first uplink data sent on the second cell.

[0400] As an embodiment, the first uplink data carried by the first wireless signal is higher-layer data.

[0401] As an embodiment, the first uplink data carried by the first wireless signal is second RRC signaling.

[0402] As an embodiment, the second RRC signaling is RRCReconfigurationComplete (RRC reconfiguration completed).

[0403] As an embodiment, the second RRC signaling is a response to the first RRC signaling.

[0404] As an embodiment, the first timer starts running earlier than the second timer.

[0405] As an embodiment, the first expiration value is greater than the second expiration value.

[0406] Example 9

[0407] Example 9 illustrates a schematic diagram of the relationship between the first timer and the second timer according to an embodiment of the present application, as shown in FIG9 .

[0408] In Example 9, a first timer is started in step 901; an indication that a cell handover is triggered is received from a lower layer in step 902; and the first timer is restarted in step S903.

[0409] As an embodiment, the first timer and the second timer are the same timer.

[0410] As an embodiment, the above method can simplify UE implementation.

[0411] As an embodiment, the above method adopts a unified solution to reduce UE costs.

[0412] As an embodiment, the above method can achieve backward compatibility.

[0413] As an embodiment, the first timer is restarted in response to receiving an indication that the cell handover is triggered.

[0414] As an embodiment, the first wireless signal is sent when the first timer is running.

[0415] As an embodiment, when the first timer expires, it is determined that the cell switching has failed.

[0416] Example 10

[0417] Example 10 illustrates a schematic diagram of the relationship between the first timer and the second timer according to an embodiment of the present application, as shown in FIG10 .

[0418] In Example 10, a first timer is started in step 1001; an indication that a cell handover is triggered is received from a lower layer in step 1002; and the first timer is stopped and a second timer is started in step S1003.

[0419] As an embodiment, the first timer and the second timer are two different timers.

[0420] As an embodiment, the running of the first timer depends on whether the second timer is started.

[0421] As an embodiment, in response to receiving an indication that the cell handover is triggered, the second timer is started and the first timer is stopped.

[0422] As an embodiment, when the second timer is started, the first timer is stopped.

[0423] As an embodiment, the first wireless signal is sent when the second timer is running.

[0424] As an embodiment, when the second timer expires, it is determined that the cell handover has failed.

[0425] Example 11

[0426] Example 11 illustrates a first timer operation flow chart according to an embodiment of the present application, as shown in FIG11 .

[0427] In Example 11, the first timer is started in step S1101; the first timer is updated in step S1102; and it is determined in step S1103 whether the first timer has expired. If so, step S1104 is executed; if not, step S1102 is jumped back to step S1102.

[0428] As an embodiment, when the first timer is running, the first timer is updated at each time interval.

[0429] As an embodiment, the initial value of the first timer is 0, and the phrase "updating the first timer" is to add 1 to the value of the first timer; when the value of the first timer is the first expiration value, the first timer expires.

[0430] As an embodiment, the initial value of the first timer is the first expiration value, and the phrase updating the first timer is to reduce the value of the first timer by 1; when the value of the first timer is 0, the first timer expires.

[0431] As an embodiment, the time interval is 1 millisecond (ms).

[0432] As an embodiment, the time interval is the duration of one time slot.

[0433] As an embodiment, the time interval is the duration of one subframe.

[0434] As an embodiment, FIG11 shows a process when the first timer is not stopped; when the first timer is running, if the condition for stopping the first timer is met, the first timer is stopped.

[0435] As an embodiment, the operation flow chart of the second timer is the same as that of the first timer, which will not be repeated here.

[0436] Example 12

[0437] Embodiment 12 illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application, as shown in FIG12. In FIG12, the first node processing device 1200 includes a first receiver 1201 and a first transmitter 1202; the first node 1200 is a UE.

[0438] In embodiment 12, the first transmitter 1202 sends a first random access sequence on the second cell in response to the first condition set being satisfied; the first receiver 1201 receives first signaling on the first cell, the first signaling being protocol layer signaling below layer 3, and the first signaling indicating switching to the second cell; the first transmitter 1202 sends a first wireless signal on the second cell, wherein the first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

[0439] As an embodiment, the first receiver 1201 receives a first RRC signaling, wherein the first RRC signaling configures a candidate cell set, and the second cell belongs to the candidate cell set; after receiving the first RRC signaling, it starts to evaluate whether the first condition set is met; wherein the first RRC signaling indicates the first random access sequence.

[0440] As an embodiment, the first receiver 1201 starts a first timer when the stored candidate cell configuration for the second cell is applied; wherein the first timer is maintained at a higher layer; and the reception time of the first signaling is later than the start time of the first timer.

[0441] As an embodiment, the first receiver 1201 starts a first timer when the stored candidate cell configuration for the second cell is applied; wherein, the first timer is maintained at a higher layer; the reception time of the first signaling is later than the start time of the first timer; the first receiver 1201 receives an indication that a cell switching is triggered from a lower layer; and starts or restarts a second timer in response to receiving the indication that the cell switching is triggered; wherein, the lower layer is a protocol layer below layer three.

[0442] As an embodiment, the first receiver 1201 starts a first timer when the stored candidate cell configuration for the second cell is applied; wherein, the first timer is maintained at a higher layer; the reception time of the first signaling is later than the start time of the first timer; the first receiver 1201 receives an indication that a cell switching is triggered from a lower layer; and starts or restarts a second timer in response to receiving the indication that the cell switching is triggered; wherein, the lower layer is a protocol layer below layer three; at least one of the first timer or the second timer is running when the first wireless signal is sent; wherein, the first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

[0443] As an embodiment, the first receiver 1201 starts a first timer when the stored candidate cell configuration for the second cell is applied; wherein, the first timer is maintained at a higher layer; the reception time of the first signaling is later than the start time of the first timer; the first receiver 1201 receives an indication that a cell handover is triggered from a lower layer; starts or restarts a second timer in response to receiving the indication that the cell handover is triggered; wherein, the lower layer is a protocol layer below layer three; the first timer is running when the first wireless signal is sent; wherein, the second timer and the first timer are the same timer; and the first timer is restarted in response to receiving the indication that the cell handover is triggered.

[0444] As an embodiment, the first receiver 1201 starts a first timer when the stored candidate cell configuration for the second cell is applied; wherein the first timer is maintained at a higher layer; the reception time of the first signaling is later than the start time of the first timer; the first receiver 1201 receives an indication that a cell handover is triggered from a lower layer; starts or restarts a second timer in response to receiving the indication that the cell handover is triggered; wherein the lower layer is a protocol layer below layer three; the second timer is running when the first wireless signal is sent; wherein, in response to receiving the indication that the cell handover is triggered, the second timer is started and the first timer is stopped.

[0445] As an embodiment, the first receiver 1201 includes the receiver 454 (including the antenna 452 ), the receiving processor 456 , the multi-antenna receiving processor 458 and the controller / processor 459 in FIG. 4 of the present application.

[0446] As an embodiment, the first receiver 1201 includes at least one of the receiver 454 (including the antenna 452), the receiving processor 456, the multi-antenna receiving processor 458 or the controller / processor 459 in FIG. 4 of the present application.

[0447] As an embodiment, the first transmitter 1202 includes the receiver 454 (including the antenna 452), the receiving processor 456, the multi-antenna receiving processor 458 and the controller / processor 459 in FIG. 4 of the present application.

[0448] As an embodiment, the first transmitter 1202 includes at least one of the receiver 454 (including the antenna 452), the receiving processor 456, the multi-antenna receiving processor 458 or the controller / processor 459 in FIG. 4 of the present application.

[0449] Example 13

[0450] Embodiment 13 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application, as shown in FIG13. In FIG13, the second node processing device 1300 includes a second receiver 1301, or the second node processing device 1300 includes a second transmitter 1302, or the second node processing device 1300 includes a second receiver 1301 and a second transmitter 1302; the second node 1300 is a base station.

[0451] In embodiment 13, a second receiver 1301 receives a first random access sequence on a second cell, and a first condition set is satisfied and used to trigger the first random access sequence; a first radio signal is received on the second cell; wherein the first random access sequence is used to trigger first signaling, and the first signaling is transmitted on the first cell; the first signaling is protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first radio signal; or, a second transmitter 1302 sends a first signaling on the first cell, the first signaling is protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; wherein the first random access sequence is used to trigger the first signaling, and the first random access sequence is transmitted on the second cell, and the first condition set is satisfied and used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first radio signal, and the first radio signal is transmitted on the second cell.

[0452] As an embodiment, the second node includes the second receiver 1301 and the second transmitter 1302.

[0453] As an embodiment, the second transmitter 1302 sends a first RRC signaling, wherein the first RRC signaling configures a candidate cell set, and the second cell belongs to the candidate cell set; wherein, after the first RRC signaling is received, whether the first condition set is met is evaluated; and the first RRC signaling indicates the first random access sequence.

[0454] As an embodiment, when the stored candidate cell configuration for the second cell is applied, a first timer is started; wherein the first timer is maintained at a higher layer; and the sending time of the first signaling is later than the start time of the first timer.

[0455] As an embodiment, when the stored candidate cell configuration for the second cell is applied, a first timer is started; wherein, the first timer is maintained at a higher layer; the sending time of the first signaling is later than the start time of the first timer; an indication that a cell switch is triggered is received from a lower layer; as a response to the indication that a cell switch is triggered being received, a second timer is started or restarted; wherein, the lower layer is a protocol layer below layer three.

[0456] As an embodiment, when the stored candidate cell configuration for the second cell is applied, a first timer is started; wherein, the first timer is maintained at a higher layer; the sending time of the first signaling is later than the start time of the first timer; an indication that a cell handover is triggered is received from a lower layer; as a response to the receipt of the indication that the cell handover is triggered, a second timer is started or restarted; wherein, the lower layer is a protocol layer below layer three; at least one of the first timer or the second timer is running when the first wireless signal is sent; wherein, the first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

[0457] As an embodiment, when the stored candidate cell configuration for the second cell is applied, a first timer is started; wherein, the first timer is maintained at a higher layer; the sending time of the first signaling is later than the start time of the first timer; an indication that a cell handover is triggered is received from a lower layer; in response to the receipt of the indication that the cell handover is triggered, a second timer is started or restarted; wherein, the lower layer is a protocol layer below layer three; the first timer is running when the first wireless signal is sent; wherein, the second timer is the same timer as the first timer; in response to the receipt of the indication that the cell handover is triggered, the first timer is restarted.

[0458] As an embodiment, when the stored candidate cell configuration for the second cell is applied, a first timer is started; wherein, the first timer is maintained at a higher layer; the sending time of the first signaling is later than the start time of the first timer; an indication that a cell handover is triggered is received from a lower layer; in response to the indication that the cell handover is triggered being received, a second timer is started or restarted; wherein, the lower layer is a protocol layer below layer three; the second timer is running when the first wireless signal is sent; wherein, in response to the indication that the cell handover is triggered being received, the second timer is started and the first timer is stopped.

[0459] As an embodiment, the second receiver 1301 includes the receiver 418 (including the antenna 420 ), the receiving processor 470 , the multi-antenna receiving processor 472 and the controller / processor 475 in FIG. 4 of the present application.

[0460] As an embodiment, the second receiver 1301 includes at least one of the receiver 418 (including the antenna 420), the receiving processor 470, the multi-antenna receiving processor 472 or the controller / processor 475 in FIG. 4 of the present application.

[0461] As an embodiment, the second transmitter 1302 includes the transmitter 418 (including the antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 and the controller / processor 475 in FIG. 4 of the present application.

[0462] As an embodiment, the second transmitter 1302 includes at least one of the transmitter 418 (including the antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475 in FIG. 4 of the present application.

[0463] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical 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 functional module. The present application is not limited to any specific form of combination of software and hardware. The first type of communication node or UE or terminal in the present application includes but is not limited to mobile phones, tablets, notebooks, network cards, low-power devices, eMTC (enhanced Machine Type Communication) devices, NB-IoT devices, vehicle-mounted communication equipment, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication devices. The second type of communication node or base station or network-side device in the present application includes but is not limited to macrocell base stations, microcell base stations, home base stations, relay base stations, eNBs, gNBs, transmission and reception nodes TRPs (Transmission and Reception Points), relay satellites, satellite base stations, aerial base stations and other wireless communication devices.

[0464] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A first node used for wireless communication, characterized in that: include: The first transmitter transmits a first random access sequence on the second cell in response to the first set of conditions being satisfied; A first receiver receives a first signaling on a first cell, where the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; The first transmitter sends a first wireless signal on the second cell; The first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

2. The first node according to claim 1, characterized in that: include: The first receiver receives a first RRC signaling, where the first RRC signaling is a candidate cell set configuration, and the second cell belongs to the candidate cell set; After receiving the first RRC signaling, start evaluating whether the first condition set is met; The first RRC signaling indicates the first random access sequence.

3. The first node according to claim 2, characterized in that: include: the first receiver, when the stored candidate cell configuration for the second cell is applied, starting a first timer; The first timer is maintained at a higher layer; and the reception time of the first signaling is later than the start time of the first timer.

4. The first node according to claim 3, characterized in that: include: The first receiver receives an indication from a lower layer that a cell handover is triggered; in response to receiving the indication that the cell handover is triggered, starts or restarts a second timer; The lower layer is a protocol layer below layer 3.

5. The first node according to claim 4, characterized in that: At least one of the first timer or the second timer is running when the first wireless signal is sent; The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

6. The first node according to claim 4 or 5, characterized in that: The first timer is running when the first wireless signal is sent; The second timer and the first timer are the same timer; in response to receiving the indication that the cell switching is triggered, the first timer is restarted.

7. The first node according to claim 4 or 5, characterized in that: The second timer is running when the first wireless signal is sent; In which, as a response to receiving the indication that the cell switching is triggered, the second timer is started and the first timer is stopped.

8. A second node used for wireless communication, characterized in that: include: A second receiver receives a first random access sequence on a second cell, wherein a first condition set is satisfied and is used to trigger the first random access sequence; receiving a first wireless signal on the second cell; The first random access sequence is used to trigger a first signaling, the first signaling is transmitted on the first cell; the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal; or, A second transmitter sends a first signaling on the first cell, where the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; The first random access sequence is used to trigger the first signaling, and the first random access sequence is in the The first wireless signal is transmitted on the second cell, and a first condition set is satisfied and is used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to a first wireless signal, and the first wireless signal is transmitted on the second cell.

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

10. The second node according to claim 8 or 9, characterized in that: include: The second transmitter sends a first RRC signaling, where the first RRC signaling is a candidate cell set configuration for a candidate cell, and the second cell belongs to the candidate cell set; After the first RRC signaling is received, whether the first condition set is satisfied is evaluated; and the first RRC signaling indicates the first random access sequence.

11. The second node according to claim 10, characterized in that: When the stored candidate cell configuration for the second cell is applied, a first timer is started; The first timer is maintained at a higher layer; and the sending time of the first signaling is later than the start time of the first timer.

12. The second node according to claim 11, characterized in that: An indication that a cell handover is triggered is received from a lower layer; a second timer is started or restarted in response to the indication that a cell handover is triggered being received; The lower layer is a protocol layer below layer 3.

13. The second node according to claim 12, characterized in that: At least one of the first timer or the second timer is running when the first wireless signal is sent; The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

14. The second node according to claim 12 or 13, characterized in that: The first timer is running when the first wireless signal is sent; The second timer and the first timer are the same timer; and the first timer is restarted in response to receiving the indication that the cell switching is triggered.

15. The second node according to claim 12 or 13, characterized in that: The second timer is running when the first wireless signal is sent; In which, as a response to receiving the indication that the cell switching is triggered, the second timer is started and the first timer is stopped.

16. A method in a first node for wireless communication, characterized in that: include: In response to the first set of conditions being satisfied, sending a first random access sequence on the second cell; receiving a first signaling on a first cell, where the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; Sending a first wireless signal on the second cell; The first random access sequence is used to trigger the first signaling, the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal.

17. The method in the first node according to claim 16, characterized in that: include: receiving a first RRC signaling, where the first RRC signaling is a candidate cell set configuration for a candidate cell, and the second cell belongs to the candidate cell set; After receiving the first RRC signaling, start evaluating whether the first condition set is met; The first RRC signaling indicates the first random access sequence.

18. The method in the first node according to claim 17, characterized in that: include: When the stored candidate cell configuration for the second cell is applied, starting a first timer; wherein the first timer is maintained at a higher layer; The receiving time of the first signaling is later than the starting time of the first timer.

19. The method in the first node according to claim 18, characterized in that: include: receiving an indication from a lower layer that a cell handover is triggered; In response to receiving the indication that the cell handover is triggered, starting or restarting a second timer; The lower layer is a protocol layer below layer 3.

20. The method in the first node according to claim 19, characterized in that: At least one of the first timer or the second timer is running when the first wireless signal is sent; The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

21. The method in the first node according to claim 19 or 20, characterized in that: The first timer is running when the first wireless signal is sent; The second timer and the first timer are the same timer; in response to receiving the indication that the cell switching is triggered, the first timer is restarted.

22. The method in the first node according to claim 19 or 20, characterized in that: The second timer is running when the first wireless signal is sent; In which, as a response to receiving the indication that the cell switching is triggered, the second timer is started and the first timer is stopped.

23. A method in a second node for wireless communication, characterized in that: include: Receiving a first random access sequence on a second cell, wherein a first condition set is satisfied and is used to trigger the first random access sequence; receiving a first wireless signal on the second cell; The first random access sequence is used to trigger a first signaling, the first signaling is transmitted on the first cell; the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first wireless signal; or, Sending a first signaling on the first cell, where the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; In which, a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied and is used to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, the first timing advance command is applied to a first wireless signal, and the first wireless signal is transmitted on the second cell.

24. The method in the second node according to claim 23, characterized in that: Said A first random access sequence is received on a second cell, and a first condition set is satisfied and used to trigger the first random access sequence; a first radio signal is received on the second cell; wherein the first random access sequence is used to trigger a first signaling, and the first signaling is transmitted on the first cell; the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling includes a first timing advance command, and the first timing advance command is applied to the first radio signal; and, said A first signaling is sent on a first cell, the first signaling is a protocol layer signaling below layer 3, and the first signaling indicates switching to a second cell; wherein a first random access sequence is used to trigger the first signaling, the first random access sequence is transmitted on the second cell, and a first condition set is satisfied to trigger the first random access sequence; the first condition set includes that the channel quality of the first cell is worse than a first threshold; the first signaling comprising a first timing advance command, the first timing advance command being applied to a first wireless signal, the first wireless signal being transmitted on the second cell; All were executed.

25. The method in the second node according to claim 23 or 24, characterized in that: include: Sending a first RRC signaling, where the first RRC signaling is a candidate cell set configuration for a candidate cell, and the second cell belongs to the candidate cell set; After the first RRC signaling is received, whether the first condition set is satisfied is evaluated; and the first RRC signaling indicates the first random access sequence.

26. The method in the second node according to claim 25, characterized in that: When the stored candidate cell configuration for the second cell is applied, a first timer is started; The first timer is maintained at a higher layer; and the sending time of the first signaling is later than the start time of the first timer.

27. The method in the second node according to claim 26, characterized in that: An indication that a cell handover is triggered is received from a lower layer; a second timer is started or restarted in response to the indication that a cell handover is triggered being received; The lower layer is a protocol layer below layer 3.

28. The method in the second node according to claim 27, characterized in that: At least one of the first timer or the second timer is running when the first wireless signal is sent; The first wireless signal is sent after the first signaling, and the first wireless signal carries the first uplink data.

29. The method in the second node according to claim 27 or 28, characterized in that: The first timer is running when the first wireless signal is sent; The second timer and the first timer are the same timer; and the first timer is restarted in response to receiving the indication that the cell switching is triggered.

30. The method in the second node according to claim 27 or 28, characterized in that: The second timer is running when the first wireless signal is sent; In which, as a response to receiving the indication that the cell switching is triggered, the second timer is started and the first timer is stopped.

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