Method and device used in wireless communication

Abstract

The invention discloses a method and a device used in wireless communication. A first node receives a first RRC signaling, wherein the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; in response to receiving the first RRC signaling, beginning to evaluate whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one handover candidate cell; receiving a first signaling; in response to receiving the first signaling, performing a first action, the first action depending on the first set of conditions; wherein the first signaling triggers an early uplink synchronization process on the second cell; the first condition set comprises at least one of the condition that the channel quality of the first cell is poor than a first threshold value or the channel quality of the second cell is better than a second threshold value; the first cell is a serving cell of the first node. According to the invention, the cell switching success rate can be improved.

Description

Technical Field

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

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

[0003] In the new air interface technology, cell switching provides effective mobility support. The basic requirements of cell switching are to reduce switching delay, reduce the impact on delay-sensitive services, and improve the success rate of cell switching. In order to adapt to various application scenarios and meet different needs, 3GPP has been evolving cell switching technology. Summary of the invention

[0004] When a UE (User Equipment) or terminal moves from the coverage of one cell to the coverage of another cell, it is necessary to change the serving cell of the UE or terminal, that is, switch from the source cell to the target cell. Existing cell switching is usually based on L3 (Layer 3) measurement, and is triggered by the network sending RRC (Radio Resource Control) signaling including Reconfiguration with Synchronization. Due to the robustness problem of RRC signaling, 3GPP RAN introduced technologies such as Conditional Handover (CHO) in Rel (version)-17. Conditional handover is a cell switching process triggered by the UE itself based on the results of the evaluated L3 channel quality. Cell switching implemented at L3 has the characteristics of long delay and long service interruption time. In order to overcome the above shortcomings, it was decided at the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #94e plenary meeting to start the WI (Work Item) standardization work on the cell switching technology based on L1 / L2 (Layer 1 / Layer 2). The design goal of L1 / L2-based cell switching, namely LTM (L1 / L2-triggered mobility), is to achieve fast switching of UE serving cells.

[0005] The inventors have found through research that how to coordinate the cell switching triggered by the terminal and the cell switching triggered by the network needs further research. In response to the above problems, the present application discloses a solution. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Although the original intention of the present application is for the Uu air interface, the present application can also be used for the PC5 port. Further, although the present application is for the cell switching based on L1 / L2 triggering, the present application is also applicable to the cell switching based on L3 triggering. Further, although the original intention of the present application is for the cell switching scenario, the present application is also applicable to other scenarios facing similar problems, including but not limited to relay, dual-connectivity (DC), multi-connectivity (MC), multi-path (MP), etc., to achieve similar technical effects. In addition, the use of a unified solution for different scenarios also helps to reduce hardware complexity and cost. In particular, the interpretation of the terms (Terminology), nouns, functions, and variables in the present application (if not otherwise specified) can 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] receiving a first RRC signaling indicating at least one handover candidate cell and at least one corresponding candidate configuration;

[0008] In response to receiving the first RRC signaling, start evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one handover candidate cells;

[0009] receiving a first signaling;

[0010] In response to receiving the first signaling, performing a first action, the first action being dependent on the first set of conditions;

[0011] Among them, the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell is worse than a first threshold or the channel quality of the second cell is better than a second threshold; the first cell is a service cell of the first node.

[0012] As an embodiment, the at least one handover candidate cell is configured as a candidate cell supporting terminal-triggered cell handover.

[0013] As an embodiment, the above method supports terminal-triggered cell switching through the first RRC signaling.

[0014] As an embodiment, the cell switching triggered by the terminal includes CHO (Conditional Handover, conditional switching).

[0015] As an embodiment, the cell switching triggered by the terminal includes conditional LTM.

[0016] As an embodiment, the conditional LTM is an LTM triggered by a terminal.

[0017] As an embodiment, the above method supports an early uplink synchronization process for cell switching through the first signaling.

[0018] As an embodiment, the network sends the first signaling, which initiates preparation for cell switching for the second cell.

[0019] As an embodiment, the problem to be solved by the present application is: when terminal-triggered cell switching is configured, if the network initiates an early uplink synchronization process for cell switching, how to determine the behavior of the terminal.

[0020] As an embodiment, the solution of the present application is: when the cell switching based on terminal triggering is configured, if the network initiates an early uplink synchronization process for the cell switching, the terminal performs the first action.

[0021] As an embodiment, the above method can reduce the cell switching delay.

[0022] As an embodiment, the above method can improve the robustness of cell switching.

[0023] As an embodiment, whether to trigger cell switching to the second cell is determined at least based on an evaluation result of whether the first condition set for the second cell is satisfied.

[0024] According to one aspect of the present application, it includes:

[0025] In response to receiving the first signaling, starting a first time window;

[0026] The first action is for the first time window.

[0027] As an embodiment, the first action is performed along with the start of the first time window.

[0028] As an embodiment, the executing the first action along with starting the first time window includes: executing the first action and starting the first time window are inseparable (atomic).

[0029] As an embodiment, the executing the first action along with starting the first time window includes: executing the first action and starting the first time window are mutually accompanying.

[0030] As an embodiment, executing the first action along with the start of the first time window includes: executing the first action immediately following the start of the first time window.

[0031] As an embodiment, the executing the first action along with starting the first time window includes: starting the first time window immediately after executing the first action.

[0032] As an embodiment, the first action is performed when the first time window runs.

[0033] As an embodiment, in the present application, within the first time window, in the first time window, and when the first time window is running have the same meaning and can be used interchangeably.

[0034] As an embodiment, the above method can improve system robustness for the first time window through the first action.

[0035] According to one aspect of the present application, it includes:

[0036] The first action is to stop evaluating whether the first set of conditions for the second cell is met in the first time window.

[0037] As an embodiment, the network usually has more information. In addition to the cell channel quality, other factors such as cell load, whether the cell is in an energy saving state, and the services provided by the cell will also affect the success rate of the cell switching.

[0038] As an embodiment, after the network starts the preparation work for the cell switching, suspending the evaluation can delay the cell switching triggered by the terminal and can give priority to supporting the cell switching triggered by the network, thereby improving the success rate of the cell switching.

[0039] As an embodiment, the above method can achieve the beneficial effect of terminal power saving.

[0040] According to one aspect of the present application, it includes:

[0041] The first action is to continue evaluating whether the first condition set for the second cell is met in the first time window, and not trigger handover to the second cell in the first time window when the first condition set for the second cell is met.

[0042] As an embodiment, after the network starts the preparation work for the cell switching, the cell switching triggered by the terminal is suspended and the cell switching triggered by the network can be preferentially supported, thereby improving the success rate of the cell switching.

[0043] According to one aspect of the present application, it includes:

[0044] Switching to the second cell;

[0045] The first time window expires and the first condition set for the second cell is met.

[0046] As an embodiment, the expiration of the first time window includes: no cell switching command is received in the first time window.

[0047] As an embodiment, when the network starts the preparation for cell switching and no cell sends a switching command in the first time window, in order to avoid wireless link failure caused by continuous deterioration of channel quality, the first node switches to the second cell.

[0048] As an embodiment, the above method can improve the robustness of the wireless link.

[0049] According to one aspect of the present application, it includes:

[0050] Continue to evaluate whether the first condition set for the second cell is met;

[0051] The first time window expires, and the first condition set for the second cell is not met.

[0052] As an embodiment, when the network starts the preparation for cell switching and does not issue a cell switching command in the first time window, in order to avoid wireless link failure caused by continuous deterioration of channel quality, the first node continues to evaluate whether the first condition set is met.

[0053] According to one aspect of the present application, it includes:

[0054] receiving a second signaling while the first time window is running, the second signaling indicating switching to the second cell;

[0055] In response to receiving the second signaling, the first time window is stopped and the second cell is switched.

[0056] As an embodiment, in the above method, the network starts the preparation work for cell switching and sends a cell switching command in the first time window, preferentially supports network-triggered cell switching, and can improve the success rate of cell switching.

[0057] According to one aspect of the present application, it includes:

[0058] The switching to the second cell includes sending a target signal on the second cell;

[0059] The target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of the first random access sequence or the second RRC signaling.

[0060] As an embodiment, sending the target signal includes: sending one of PRACH (Physical Random Access Channel) or PUSCH (Physical Uplink Shared Channel), and the PRACH and the PUSCH are respectively a physical uplink channel.

[0061] As an embodiment, sending a physical uplink channel includes: sending an uplink signal through the physical uplink channel.

[0062] As an embodiment, sending a physical uplink channel includes: an uplink signal is carried and sent on the physical uplink channel.

[0063] According to one aspect of the present application, it includes:

[0064] Whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window;

[0065] The first information block includes a timing advance command for the second cell; and the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0066] As an embodiment, when the first information block is received within the first time window, the target signal carries the second RRC signaling; when the first information block is not received within the first time window, the target signal carries the first random access sequence.

[0067] As an embodiment, the above method can avoid re-initiating a random access process in order to obtain uplink synchronization with the second cell by receiving the first information block in the first time window, thereby achieving the beneficial effect of reducing cell switching delay.

[0068] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0069] Sending a first RRC signaling, where the first RRC signaling indicates at least one handover candidate cell and at least one corresponding candidate configuration;

[0070] Sending a first signaling;

[0071] In which, as a response to the first RRC signaling being received, whether a first condition set for a second cell is met is evaluated, and the second cell is one of the at least one switching candidate cells; as a response to the first signaling being received, a first action is performed, and the first action depends on the first condition set; the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of a recipient of the first signaling.

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

[0073] In response to the first signaling being received, a first time window is started;

[0074] The first action is for the first time window.

[0075] According to one aspect of the present application, it includes:

[0076] The first action is to stop evaluating whether the first set of conditions for the second cell is met in the first time window.

[0077] According to one aspect of the present application, it includes:

[0078] The first action is to continue evaluating whether the first condition set for the second cell is met in the first time window, and not trigger handover to the second cell in the first time window when the first condition set for the second cell is met.

[0079] According to one aspect of the present application, it includes:

[0080] The receiver of the first signaling switches to the second cell;

[0081] The first time window expires and the first condition set for the second cell is met.

[0082] According to one aspect of the present application, it includes:

[0083] Whether the first set of conditions for the second cell is satisfied is continuously evaluated;

[0084] The first time window expires, and the first condition set for the second cell is not met.

[0085] According to one aspect of the present application, it includes:

[0086] Sending a second signaling when the first time window is running, wherein the second signaling indicates switching to the second cell;

[0087] As a response to the second signaling being received, the first time window is stopped, and the receiver of the first signaling is switched to the second cell.

[0088] According to one aspect of the present application, it includes:

[0089] receiving a target signal on the second cell;

[0090] The switching to the second cell includes receiving the target signal on the second cell; the target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; and the target signal carries one of a first random access sequence or a second RRC signaling.

[0091] According to one aspect of the present application, it includes:

[0092] Whether the target signal carries the first random access sequence or the second RRC signaling depends on whether the first information block is received within the first time window;

[0093] The first information block includes a timing advance command for the second cell; and the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

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

[0095] A first receiver receives a first RRC signaling, where the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration;

[0096] The first processor, in response to receiving the first RRC signaling, starts evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one handover candidate cell;

[0097] The first receiver receives a first signaling;

[0098] The first processor, in response to receiving the first signaling, performs a first action, the first action being dependent on the first set of conditions;

[0099] Among them, the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell is worse than a first threshold or the channel quality of the second cell is better than a second threshold; the first cell is a service cell of the first node.

[0100] As an embodiment, the first node is a terminal.

[0101] The present application discloses a second node used for wireless communication, characterized in that it includes:

[0102] A first transmitter sends a first RRC signaling, wherein the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; sending the first signaling;

[0103] In which, as a response to the first RRC signaling being received, whether a first condition set for a second cell is met is evaluated, and the second cell is one of the at least one switching candidate cells; as a response to the first signaling being received, a first action is performed, and the first action depends on the first condition set; the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of a recipient of the first signaling.

[0104] As an embodiment, the second node is a base station.

[0105] The present application discloses a terminal, characterized in that:

[0106] The terminal includes: one or more processors and a memory;

[0107] The memory is coupled to the one or more processors, and the memory is used to store computer program codes, where the computer program codes include computer instructions. The one or more processors call the computer instructions to enable the terminal to execute the above method in the first node.

[0108] The present application discloses a base station, characterized in that:

[0109] The base station includes: one or more processors and a memory;

[0110] The memory is coupled to the one or more processors, and the memory is used to store computer program codes, where the computer program codes include computer instructions, and the one or more processors call the computer instructions to enable the base station to execute the above method in the second node. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0112] Figure 1 An example of a signal processing flow chart in a first node according to an embodiment of the present application is provided;

[0113] Figure 2 A schematic diagram illustrating a network architecture according to an embodiment of the present application is illustrated;

[0114] Figure 3 A schematic diagram illustrating a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0115] Figure 4 A hardware module schematic diagram of a communication device according to an embodiment of the present application is illustrated;

[0116] Figure 5 An example of a wireless signal transmission flow chart according to an embodiment of the present application is provided;

[0117] Figure 6 A schematic diagram illustrating a first signaling and a first time window according to an embodiment of the present application is illustrated;

[0118] Figure 7 A schematic diagram illustrating a first signaling and a first time window according to an embodiment of the present application is illustrated;

[0119] Figure 8 A schematic diagram illustrating a first signaling, a second signaling and a first time window according to an embodiment of the present application is illustrated;

[0120] Fig. 9 A signal processing flow chart in a first node according to an embodiment of the present application is illustrated;

[0121] Fig.10 An example of a wireless signal transmission flow chart according to an embodiment of the present application is provided;

[0122] Fig.11 A signal processing flow chart in a first node according to an embodiment of the present application is illustrated;

[0123] Fig.12An example structural block diagram of a processing device in a first node according to an embodiment of the present application is shown;

[0124] Fig.13 The structural block diagram of the processing device in the second node according to an embodiment of the present application is illustrated. DETAILED DESCRIPTION

[0125] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

[0126] Example 1

[0127] Embodiment 1 illustrates a signal processing flow chart in a first node according to an embodiment of the present application, as shown in the attached Figure 1 shown.

[0128] In embodiment 1, the first node 100 receives a first RRC signaling in step 101, and the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; in step 102, as a response to receiving the first RRC signaling, starts to evaluate whether a first condition set for a second cell is met, and the second cell is one of the at least one switching candidate cells; receives a first signaling in step 103; in step 104, as a response to receiving the first signaling, performs a first action, and the first action depends on the first condition set; wherein the first signaling triggers an early uplink synchronization process on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the signal quality of the second cell being better than a second threshold; the first cell is a service cell of the first node.

[0129] As an embodiment, the first RRC signaling is received on a serving cell of the first node.

[0130] As an embodiment, the service cell of the first node includes a SpCell (Special Cell).

[0131] As an embodiment, the service cell of the first node includes a SCell (Secondary Cell).

[0132] As an embodiment, the first RRC signaling is RRCReconfiguration (RRC reconfiguration).

[0133] As an embodiment, the first RRC signaling is LTMConfig (LTM configuration).

[0134] As an embodiment, the first RRC signaling includes condLTMConfig (conditional LTM configuration).

[0135] As an embodiment, the first RRC signaling includes condRRCReconfig (conditional RRC reconfiguration).

[0136] As an embodiment, the first RRC signaling includes LTM-Candidate.

[0137] As an embodiment, the first RRC signaling includes ltm-CandidateConfig (LTM candidate configuration).

[0138] As an embodiment, the name of the first RRC signaling includes cond (condition).

[0139] As an embodiment, the name of the first RRC signaling includes CLTM (Conditional LTM).

[0140] As an embodiment, the first RRC signaling indicates at least one switching candidate cell.

[0141] As an embodiment, the at least one switching candidate cell is configured according to a measurement report measured and reported by the first node.

[0142] As a sub-embodiment of the above embodiment, the measurement is L1 (layer 1) measurement.

[0143] As a sub-embodiment of the above embodiment, the measurement is at beam level.

[0144] As a sub-embodiment of the above embodiment, the beam is configured, or pre-configured.

[0145] As a sub-embodiment of the above-mentioned embodiment, the measurement is based on SSB (SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) block), or CSI (Channel Status Information)-RS (Reference Signal).

[0146] As an embodiment, the at least one switching candidate cell is for cell switching, and the cell switching includes cell switching triggered by a protocol layer below layer three.

[0147] As an embodiment, the at least one switching candidate cell is for LTM.

[0148] As an embodiment, the at least one handover candidate cell is for conditional LTM.

[0149] As an embodiment, the at least one handover candidate cell is configured to perform conditional LTM.

[0150] As an embodiment, the first RRC signaling includes at least one candidate configuration corresponding to the at least one switching candidate cell.

[0151] As an embodiment, each of the at least one handover candidate cell corresponds to one of the at least one candidate configuration.

[0152] As an embodiment, a candidate configuration is indicated by a candidate ID.

[0153] As an embodiment, the candidate configuration is applied to CHO.

[0154] As an embodiment, the candidate configuration is applied to conditional LTM.

[0155] As an embodiment, the candidate configuration is applied to CPC (Conditional PSCell Change, conditional primary SCG (Secondary Cell Group) cell change).

[0156] As an embodiment, the candidate configuration is applied to CPA (Conditional PSCellAddition, conditional SCG cell addition).

[0157] As an embodiment, a candidate configuration corresponding to a handover candidate cell is applied to perform uplink and downlink communications after switching to the handover candidate cell.

[0158] As an embodiment, in response to receiving the first RRC signaling, it is started to evaluate whether the first condition set for the second cell is met.

[0159] As an embodiment, the first condition set for the second cell is configured by the base station.

[0160] As an embodiment, the first condition set for the second cell is configured by a maintaining base station of the first cell.

[0161] As an embodiment, the second cell is a switching candidate cell among the at least one switching candidate cell.

[0162] As an embodiment, the second cell waits to become a service cell of the first node.

[0163] As an embodiment, the second cell is an SCell (secondary cell) of the first node.

[0164] As an embodiment, the first RRC signaling includes an identifier of the second cell.

[0165] As an embodiment, the identifier of the second cell is PhysCellId (physical cell identifier).

[0166] As an embodiment, the identifier of the second cell is candidateCellID (switching candidate cell identifier).

[0167] As an embodiment, the first condition set is applicable to the second cell.

[0168] As an embodiment, the first condition set includes at least one condition.

[0169] As an embodiment, the first condition set being satisfied means that all conditions in the first condition set are satisfied.

[0170] As an embodiment, the first condition set not being satisfied means that any condition in the first condition set is not satisfied.

[0171] As an embodiment, the first condition set includes conditions for executing conditional LTM.

[0172] As an embodiment, the first condition set includes an event for executing a conditional LTM.

[0173] As an embodiment, the first condition set includes conditions for executing CHO.

[0174] As an embodiment, starting to evaluate whether the first set of conditions for the second cell is met includes: measuring the channel quality of the first cell, or measuring at least one of the channel quality in the second cell, and evaluating whether the first set of conditions is met.

[0175] As an embodiment, the first condition set includes at least one of: the channel quality of the first cell is worse than a first threshold or the channel quality of the second cell is better than a second threshold.

[0176] As a sub-embodiment of the above embodiment, the first condition set is for a first time length.

[0177] As an embodiment, the first condition set includes at least one of: the channel quality of the first cell is worse than a first threshold within the first time length; or the channel quality of the second cell is better than a second threshold within the first time length.

[0178] As an embodiment, the first time length is configurable.

[0179] As an embodiment, the first time length is 0.

[0180] As an embodiment, the first time length is a value greater than 0.

[0181] As an embodiment, the first time length is indicated by TimeToTrigger (trigger time).

[0182] As an embodiment, the first cell is a service cell of the first node.

[0183] As an embodiment, the first cell is a source cell of cell switching.

[0184] As an embodiment, the first cell is a SpCell, and the SpCell is a PCell (Primary Cell) or a PSCell (Primary SCG (Secondary Cell Group) Cell).

[0185] As an embodiment, the channel quality of the first cell is obtained based on a first beam set measurement.

[0186] As a sub-embodiment of the above embodiment, the measurement is a physical layer measurement.

[0187] As a sub-embodiment of the above embodiment, the measurement is L1 (layer 1) measurement.

[0188] As a sub-embodiment of the above embodiment, the measurement is at beam level.

[0189] As a sub-embodiment of the above embodiment, the measurement is based on SSB, or CSI-RS.

[0190] As a sub-embodiment of the above embodiment, the channel quality of the first cell is obtained by performing L1 filtering on the L1 measurement value.

[0191] As an embodiment, the first beam set is used for transmission in the first cell.

[0192] As an embodiment, the first beam set includes at least one beam.

[0193] As an embodiment, the first beam set includes only one beam.

[0194] As an embodiment, the first RRC signaling indicates the first beam set.

[0195] As an embodiment, a third signaling is received, wherein the third signaling indicates the first beam set.

[0196] As an embodiment, the third signaling is protocol layer signaling below the RRC layer.

[0197] As an embodiment, the third signaling is PDCCH (Physical Downlink Control Channel).

[0198] As an embodiment, the third signaling is MAC (Medium Access Control) CE (Control Element).

[0199] As an embodiment, the first beam set is a beam for sending PDCCH, the PDCCH schedules PDSCH (Physical Downlink Shared Channel), the PDSCH carries the first RRC signaling, and the first beam set includes only one beam.

[0200] As an embodiment, the first beam set is a beam for sending PDSCH, the PDSCH carries the first RRC signaling, and the first beam set includes one beam.

[0201] As an embodiment, the channel quality of the second cell is obtained based on a second beam set measurement.

[0202] As a sub-embodiment of the above embodiment, the measurement is a physical layer measurement.

[0203] As a sub-embodiment of the above embodiment, the measurement is L1 (layer 1) measurement.

[0204] As a sub-embodiment of the above embodiment, the measurement is at beam level.

[0205] As a sub-embodiment of the above embodiment, the measurement is based on SSB, or CSI-RS.

[0206] As a sub-embodiment of the above embodiment, the channel quality of the second cell is obtained by filtering the L1 measurement value through L1 filtering.

[0207] As an embodiment, the second beam set is for transmission in the second cell.

[0208] As an embodiment, the second beam set includes at least one beam.

[0209] As an embodiment, the second beam set includes only one beam.

[0210] As an embodiment, the second beam set is indicated by a maintaining base station of the first cell.

[0211] As an embodiment, any beam in the second beam set is associated with an SSB of the second cell, or is associated with a CSI-RS of the second cell.

[0212] As an embodiment, the first RRC signaling indicates the second beam set.

[0213] As an embodiment, the first RRC signaling includes a ltm-DL-OrJointTCI-StateToAddModList (LTM downlink - joint transmission configuration indication state add modification list) field, and the ltm-DL-OrJointTCI-StateToAddModList field includes at least one CandidateTCI-State (candidate transmission configuration indication state) field, and the at least one CandidateTCI-State field indicates at least one beam, and any beam in the second beam set belongs to the at least one beam.

[0214] As a sub-embodiment of the above two embodiments, the first RRC signaling indicates activation of the second beam set.

[0215] As a sub-embodiment of the above two embodiments, a MAC CE is received after receiving the first RRC signaling, and the one MAC CE indicates activation of the second beam set.

[0216] As an embodiment, the first beam set and the second beam set respectively include downlink beams.

[0217] 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).

[0218] As an embodiment, the reference signal is SSB (Synchronization Signal Block).

[0219] As an embodiment, the reference signal is SSB (Synchronization Signals / PhysicalBroadcast Channel block).

[0220] As an embodiment, the reference signal is CSI-RS (Channel Status Information-Reference Signal).

[0221] As an embodiment, the first condition set includes one condition, and the one condition is that the channel quality of the first cell is worse than the first threshold.

[0222] As a sub-embodiment of the above embodiment, the first threshold is configurable.

[0223] As a sub-embodiment of the above embodiment, the first threshold is related to the channel quality of the second cell.

[0224] As a sub-embodiment of the above embodiment, the first threshold is the channel quality of the second cell.

[0225] As a sub-embodiment of the above embodiment, the first threshold is a value of the channel quality of the second cell after linear processing.

[0226] As a sub-embodiment of the above embodiment, the first threshold is the difference between the channel quality of the second cell and a first offset value, and the first offset value is configured.

[0227] As an embodiment, the channel quality of the first cell being worse than the first threshold includes: the channel quality of the first cell being less than the first threshold.

[0228] As an embodiment, the channel quality of the first cell being worse than the first threshold includes: Mp < the first threshold; where the channel quality of the first cell is Mp.

[0229] As a sub - embodiment of the above - mentioned embodiment, the first threshold is Thresh1, and the first threshold is configured.

[0230] As a sub - embodiment of the above - mentioned embodiment, the first threshold is Thresh1 - Hys; where the Hys is a hysteresis parameter for an event; the Thresh1 is configured.

[0231] As an embodiment, the channel quality of the first cell being 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.

[0232] As an embodiment, the channel quality of the first cell being worse than the first threshold includes: Mp < Mn - the first offset value; where the Mp is the channel quality of the first cell; the Mn is the channel quality of the second cell; the first threshold is the difference between the channel quality of the second cell and the first offset value.

[0233] As a sub - embodiment of the above - mentioned embodiment, the first offset value is configured.

[0234] Specifically, the first offset value is (Ofp + Ocp + Off)-(Ofn + Ocn - Hys); where the Ofp is an offset value dedicated to the measurement object of the first cell; the Ocp is a cell - specific offset value for the first cell; the Off is an offset value for the event; the Ofn is an offset value dedicated to the measurement object of the second cell; the Ocn is a cell - specific offset value for the second cell; the Hys is a hysteresis parameter for the event.

[0235] As an embodiment, 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.

[0236] As an embodiment, the first condition set includes one condition, and the one condition is that the channel quality of the second cell is better than the second threshold.

[0237] As a sub-embodiment of the above embodiment, the second threshold is configurable.

[0238] As a sub-embodiment of the above embodiment, the second threshold is related to the channel quality of the first cell.

[0239] As a sub-embodiment of the above embodiment, the second threshold is the channel quality of the first cell.

[0240] As a sub-embodiment of the above embodiment, the second threshold is a value of the channel quality of the first cell after linear processing.

[0241] As a sub-embodiment of the above embodiment, the second threshold is the sum of the channel quality of the first cell and a second offset value, and the second offset value is configurable.

[0242] As an embodiment, the channel quality of the second cell is better than the second threshold includes: the channel quality of the second cell is greater than the second threshold.

[0243] As an embodiment, the channel quality of the second cell is better than the second threshold, which includes: Mn>the second threshold; wherein, Mn is the channel quality of the second cell.

[0244] As a sub-embodiment of the above embodiment, the second threshold is Thresh2, and Thresh2 is configurable.

[0245] As a sub - embodiment of the above - mentioned embodiment, the second threshold is Thresh2-(Ofn + Ocn - Hys); where, the Ofn and the Ocn are respectively the (measurement object specific) offset values dedicated to the measurement object of the second cell; the Hys is the hysteresis parameter for the event, and the Thresh2 is configured.

[0246] As an embodiment, that the channel quality of the second cell is better than the second threshold includes: Mn > Mp; where, the Mn is the channel quality of the second cell; the second threshold is the Mp, and the Mp is the channel quality of the first cell.

[0247] As an embodiment, that the channel quality of the second cell is better than the second threshold includes: Mn > Mp+the second offset value; where, the Mn is the channel quality of the second cell; the Mp is the channel quality of the first cell; the second threshold is the sum of the channel quality of the first cell and the second offset value.

[0248] As a sub - embodiment of the above - mentioned embodiment, the second offset value is configured.

[0249] As a sub - embodiment of the above - mentioned embodiment, the second offset value is the same as the first offset value.

[0250] As an embodiment, the first condition set includes two conditions. The first condition of the two conditions is that the channel quality of the first cell is worse than the first threshold; the second condition of the two conditions is that the channel quality of the second cell is better than the second threshold.

[0251] As a sub - embodiment of the above - mentioned embodiment, the first threshold and the second threshold are respectively configured.

[0252] As a sub - embodiment of the above - mentioned embodiment, the first threshold and the second threshold are respectively absolute thresholds.

[0253] As a sub - embodiment of the above - mentioned embodiment, 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; 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.

[0254] As a sub - embodiment of the above - mentioned embodiment, the channel quality of the first cell being worse than the first threshold includes: Mp < Thresh1 - Hys; the channel quality of the second cell being better than the second threshold includes: Mn > Thresh2 - (Ofn + Ocn - Hys); where the channel quality of the first cell is Mp, the first threshold is Thresh1 - Hys, Hys is the hysteresis parameter for the event, and Thresh1 is configured; Mn is the channel quality of the second cell, Ofn and Ocn are the offset values dedicated to the measurement object for the second cell respectively, and Thresh2 is configured.

[0255] As an embodiment, 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.

[0256] As an embodiment, the first signaling is received in the first cell.

[0257] As an embodiment, the first signaling is a physical - layer signaling.

[0258] As an embodiment, the first signaling is a PDCCH order.

[0259] As an embodiment, the first signaling indicates the second cell.

[0260] As an embodiment, the first signaling triggers an early UL (uplink) synchronization process on the second cell.

[0261] As an embodiment, the first signaling triggers a one - step random access (RA) process on the second cell.

[0262] As an embodiment, in response to receiving the first signaling, an early UL synchronization process on the second cell is initiated.

[0263] As an embodiment, the early uplink synchronization process is: an early uplink timing advance (TA) acquisition process.

[0264] As an embodiment, in response to receiving the first signaling, a first action is performed, and the first action depends on the first set of conditions.

[0265] As an embodiment, the reception of the first signaling is later than the reception of the first RRC signaling.

[0266] As an embodiment, the first signaling is received after starting to evaluate whether the first set of conditions for the second cell is met.

[0267] As an embodiment, the first action being dependent on the first condition set includes: the first action being related to the first condition set.

[0268] As an embodiment, the first action being dependent on the first condition set includes: the first action being related to evaluating whether the first condition set is satisfied.

[0269] As an embodiment, the first action being dependent on the first condition set includes: determining the first action according to the first condition set.

[0270] As an embodiment, the first action being dependent on the first condition set includes: determining the first action according to whether the first condition set is satisfied.

[0271] As an embodiment, when the first signaling is not received, the first action is not performed.

[0272] Example 2

[0273] Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the attached Figure 2 shown. Figure 2A diagram illustrating a network architecture 200 for NR 5G, LTE (Long-Term Evolution) and LTE-A (Long-Term Evolution Advanced) systems. The NR 5G, LTE or LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, NG-RAN (Next Generation Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220 and Internet Services 230. The 5GS / EPS may be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, 5GS / EPS provides packet switching services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application can be extended to networks providing circuit switching services or other cellular networks. NG-RAN includes NR Node B (gNB) 203 and other gNBs 204. gNB 203 provides user and control plane protocol terminations toward UE 201. gNB 203 can be connected to other gNBs 204 via an Xn interface (e.g., backhaul). gNB 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a TRP (Transmission Reception Point, sending and receiving node) or some other suitable terminology. In a NTN (Non Terrestrial Network, non-terrestrial / satellite network) network, gNB 203 may be a satellite, an aircraft, or a ground base station relayed by a satellite. gNB 203 provides an access point to 5GC / EPC 210 for UE 201.Examples of UE 201 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, cars, vehicle-mounted devices, vehicle-mounted communication units, wearable devices, or any other similar functional devices. Those skilled in the art may also refer to UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term. gNB203 is connected to 5GC / EPC210 via the S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF213. MME / AMF / SMF211 is the control node that handles signaling between UE201 and 5GC / EPC210. ​​In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which itself is connected to P-GW / UPF213. P-GW provides UE IP address allocation and other functions. P-GW / UPF213 is connected to Internet service 230. Internet service 230 includes operator-corresponding Internet protocol services, which may specifically include Internet, Intranet, IMS (IP Multimedia Subsystem) and PS (Packet Switching) streaming services.

[0274] As an embodiment, the UE201 corresponds to the first node in this application.

[0275] As an embodiment, the NR node B203 corresponds to the second node in this application.

[0276] As an embodiment, the UE201 is a user equipment.

[0277] As an embodiment, the UE201 is a terminal.

[0278] As an embodiment, the gNB203 is a base station.

[0279] As an embodiment, the gNB203 is a macro cell base station.

[0280] As an embodiment, the gNB203 is a micro cell base station.

[0281] As an embodiment, the gNB203 is a pico cell base station.

[0282] As an embodiment, the gNB203 is a home base station (Femtocell).

[0283] As an embodiment, the gNB203 is a base station device that supports large delay difference.

[0284] As an embodiment, the gNB203 is a flying platform device.

[0285] As an embodiment, the gNB203 is a satellite device.

[0286] As an embodiment, the gNB203 is a testing device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0287] As an embodiment, the wireless link from the UE201 to the gNB203 is an uplink, and the uplink is used to perform uplink transmission.

[0288] As an embodiment, the wireless link from the gNB203 to the UE201 is a downlink, and the downlink is used to perform downlink transmission.

[0289] As an embodiment, the UE201 and the gNB203 are connected via a Uu interface.

[0290] Example 3

[0291] Embodiment 3 illustrates a schematic diagram of a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application, as shown in the attached figure. Figure 3 shown. Figure 3is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture of the control plane 300 of the UE and gNB is shown in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to as PHY 301 in this article. Layer 2 (L2 layer) 305 is above PHY 301 and is responsible for the link between the UE and the gNB through PHY 301. The L2 layer 305 includes the MAC (Medium Access Control) sublayer 302, the RLC (Radio Link Control) sublayer 303, and the PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the gNB on the network side. The PDCP sublayer 304 provides data encryption and integrity protection. The PDCP sublayer 304 also provides support for inter-zone mobility of UEs between gNBs. The RLC sublayer 303 provides segmentation and reassembly of data packets, and retransmission of lost data packets through ARQ. The RLC sublayer 303 also provides duplicate data packet detection and protocol error detection. The MAC sublayer 302 provides mapping between logical and transport channels and multiplexing of logical channel identities. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between UEs. The MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the gNB and the UE. Although not shown in the figure, a V2X layer may also be provided above the RRC sublayer 306 in the control plane 300 of the UE. The V2X layer is responsible for generating a PC5 QoS parameter group and QoS rules based on the received service data or service request, generating a PC5 QoS flow corresponding to the PC5 QoS parameter group, and sending the PC5 QoS flow identifier and the corresponding PC5 QoS parameter group to the AS (Access Stratum) layer for the AS layer to perform QoS processing on the data packets belonging to the PC5 QoS flow identifier; the V2X layer also includes a PC5-S signaling protocol (PC5-Signaling Protocol) sublayer, and the V2X layer is responsible for indicating to the AS layer whether each transmission is a PC5-S transmission or a V2X service data transmission.The wireless protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer). The wireless protocol architecture in the user plane 350 is substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce wireless transmission overhead. The L2 layer 355 in the user plane 350 also includes a SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping between QoS (Quality of Service) flows and data radio bearers (DRBs) to support the diversity of services. The wireless protocol architecture of the UE in the user plane 350 may include, at the L2 layer, a SDAP sublayer 356, a PDCP sublayer 354, a portion of or all of the protocol sublayers of the RLC sublayer 353 and the MAC sublayer 352. Although not shown, the UE may also have several upper layers above the L2 layer 355, including a network layer (e.g., an IP layer) terminated at the P-GW on the network side and an application layer terminated at the other end of the connection (e.g., a remote UE, a server, etc.).

[0292] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0293] As an example, Figure 3 The wireless protocol architecture in is applicable to the second node in this application.

[0294] As an embodiment, the first RRC signaling in the present application is generated in the RRC306.

[0295] As an embodiment, the second RRC signaling in the present application is generated in the RRC306.

[0296] As an embodiment, the first signaling in the present application is generated in the PHY301 or the PHY351.

[0297] As an embodiment, the second signaling in the present application is generated by the MAC302 or the MAC352.

[0298] As an embodiment, the target signal in the present application is generated by the PHY301 or the PHY351.

[0299] As an embodiment, the first information block in the present application is generated by the MAC302 or the MAC352.

[0300] As an embodiment, the first random access sequence in the present application is generated in the PHY301 or the PHY351.

[0301] As an embodiment, the L2 layer 305 or 355 belongs to a higher layer.

[0302] As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

[0303] Example 4

[0304] Embodiment 4 illustrates a hardware module schematic diagram of a communication device according to an embodiment of the present application, as shown in the attached Figure 4 shown. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0305] 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.

[0306] 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.

[0307] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, the upper layer data packets from the core network or the upper layer data packets from the data source 477 are provided to the controller / processor 475. The core network and the data source 477 represent all the protocol layers above the L2 layer. The controller / processor 475 implements the functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for the retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. The multi-antenna transmit processor 471 then performs a transmit analog precoding / beamforming operation on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, and then provides it to a different antenna 420.

[0308] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream and provides it to the receiving processor 456. The receiving processor 456 and the multi-antenna receiving processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiving processor 458 performs a receiving analog precoding / beamforming operation on the baseband multi-carrier symbol stream from the receiver 454. The receiving processor 456 uses a fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receiving analog precoding / beamforming operation from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiving processor 456, wherein the reference signal will be used for channel estimation, and the data signal is recovered after multi-antenna detection in the multi-antenna receiving processor 458 to any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in the receiving processor 456, and soft decisions are generated. The receiving processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program codes and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the second communication device 410. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0309] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, the upper layer data packets are provided to the controller / processor 459 using the data source 467. The data source 467 represents all the protocol layers above the L2 layer. Similar to the transmission function at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements L2 layer functions for user plane and control plane. The controller / processor 459 is also responsible for the retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping and channel coding processing, and the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Then, the transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, which is then provided to different antennas 452 via the transmitter 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream, and then provides it to the antenna 452.

[0310] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the reception functions at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna reception processor 472 and the reception processor 470. The reception processor 470 and the multi-antenna reception processor 472 jointly implement the functions of the L1 layer. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the first communication device 450. The upper layer data packets from the controller / processor 475 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0311] As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 apparatus at least: receives a first RRC signaling, the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; as a response to receiving the first RRC signaling, starts to evaluate whether a first condition set for a second cell is satisfied, the second cell being one of the at least one switching candidate cells; receives a first signaling; as a response to receiving the first signaling, performs a first action, the first action depends on the first condition set; wherein the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of the first node.

[0312] As an embodiment, the first communication device 450 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, and the action includes: receiving a first RRC signaling, wherein the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; as a response to receiving the first RRC signaling, starting to evaluate whether a first condition set for a second cell is met, wherein the second cell is one of the at least one switching candidate cells; receiving a first signaling; as a response to receiving the first signaling, performing a first action, wherein the first action depends on the first condition set; wherein the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; and the first cell is a service cell of the first node.

[0313] As an embodiment, the second communication device 410 device 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: sends a first RRC signaling, the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; sends a first signaling; wherein, as a response to the first RRC signaling being received, an evaluation is started for whether a first condition set for a second cell is satisfied, the second cell being one of the at least one switching candidate cells; as a response to the first signaling being received, a first action is performed, the first action depends on the first condition set; the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of a recipient of the first signaling.

[0314] As an embodiment, the second communication device 410 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, the action including: sending a first RRC signaling, the first RRC signaling indicating at least one switching candidate cell and at least one corresponding candidate configuration; sending a first signaling; wherein, as a response to the first RRC signaling being received, an evaluation is started as to whether a first condition set for a second cell is satisfied, the second cell being one of the at least one switching candidate cells; as a response to the first signaling being received, a first action is executed, the first action depends on the first condition set; the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of the recipient of the first signaling.

[0315] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0316] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0317] As an embodiment, the first communication device 450 is a UE.

[0318] As an embodiment, the first communication device 450 is a relay.

[0319] As an embodiment, the first communication device 450 is a terminal.

[0320] As an embodiment, the second communication device 410 is a base station.

[0321] As an embodiment, the second communication device 410 is a distribution unit of a base station.

[0322] As an embodiment, the second communication device 410 is a piece of code in a distributed unit of a base station.

[0323] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the first RRC signaling in the present application.

[0324] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the first RRC signaling in the present application.

[0325] 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 the present application.

[0326] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiving processor 458, the receiving processor 456 or the controller / processor 459 is used to receive the first signaling in the present application.

[0327] 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 second signaling in the present application.

[0328] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna receiving processor 458, the receiving processor 456 or the controller / processor 459 is used to receive the second signaling in the present application.

[0329] 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 target signal in the present application.

[0330] 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 target signal in the present application.

[0331] 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 information block in the present application.

[0332] 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 information block in the present application.

[0333] Example 5

[0334] Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Figure 5 As shown in the attached Figure 5 In the example, the first node N51 and the first transmitter N52 communicate through the first cell, and the first node N51 and the second receiver N53 communicate through the second cell. It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in this application.

[0335] for First node N51 , receiving the first RRC signaling in step S511; starting to evaluate whether the first condition set for the second cell is met in step S512; receiving the first signaling in step S513; performing the early uplink synchronization process in step S514; starting the first time window in step S515, and performing the first action.

[0336] for First transmitter N52 , sending the first RRC signaling in step S521; sending the first signaling in step S522.

[0337] for Second receiver N53 , in step S514, an early uplink synchronization process is performed.

[0338] Step S514 includes communicating on the second cell.

[0339] In embodiment 5, a first RRC signaling is received, the first RRC signaling indicating at least one switching candidate cell and at least one corresponding candidate configuration; as a response to receiving the first RRC signaling, starting to evaluate whether a first condition set for a second cell is satisfied, the second cell being one of the at least one switching candidate cells; receiving a first signaling; as a response to receiving the first signaling, performing a first action, the first action depending on the first condition set; wherein the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of a channel quality of the first cell being worse than a first threshold or a channel quality of the second cell being better than a second threshold; the first cell is a serving cell of the first node; as a response to receiving the first signaling, starting a first time window; wherein the first action is for the first time window; the first action is to stop evaluating whether the first condition set for the second cell is satisfied in the first time window; the first action is to continue evaluating whether the first condition set for the second cell is satisfied in the first time window, and not triggering switching to the second cell in the first time window when the first condition set for the second cell is satisfied.

[0340] As an embodiment, the first node N51 communicates with the first transmitter N52 through the first cell.

[0341] As an embodiment, the first node N51 communicates with the second receiver N53 through the second cell.

[0342] As an embodiment, the second node includes at least the former of the first transmitter N52 and the second receiver N53.

[0343] As an embodiment, the second node includes the first transmitter N52, and the third node includes the second receiver N53; wherein the third node is a node other than the second node, and the third node and the second node are respectively a base station.

[0344] As a sub-embodiment of the above embodiment, the first transmitter N52 and the second receiver N53 belong to different base stations.

[0345] As a sub-embodiment of the above embodiment, the second node maintains the first cell, and the third node maintains the second cell.

[0346] As an embodiment, the second node includes the first transmitter N52 and the second receiver N53; wherein the second node is a base station.

[0347] As a sub-embodiment of the above embodiment, the first transmitter N52 and the second receiver N53 belong to the same base station.

[0348] As a sub-embodiment of the above embodiment, the second node maintains the first cell and the second cell.

[0349] As an embodiment, the first node N51 is a UE.

[0350] As an embodiment, the first node N51 is a terminal.

[0351] It should be noted that the appendix of Example 5 Figure 5 A scenario is shown in which the first node N51 and the first transmitter N52 communicate through the first cell, but in the present application, the communication between the first node N51 and the first transmitter N52 is not limited to the first cell.

[0352] As an embodiment, the first set of conditions for the second cell is not met before receiving the first signaling.

[0353] As an embodiment, the first time window is started in response to receiving the first signaling; wherein the first action is for the first time window.

[0354] As an embodiment, the first action is performed within the first time window.

[0355] As an embodiment, whether the first action is performed outside the first time window is independent of the first signaling.

[0356] As an embodiment, the first time window is a timer.

[0357] As an embodiment, the first time window is a counter.

[0358] As an embodiment, the name of the first time window includes CLTM (Conditional LTM).

[0359] As an embodiment, the name of the first time window includes window.

[0360] As an embodiment, the first time window starts in the first symbol after the reception of the first signaling is completed.

[0361] As an embodiment, the symbol is an OFDM (Orthogonal Frequency Division Multiplexing) symbol, or a single carrier symbol.

[0362] As an embodiment, starting the first time window includes: setting the value of the first time window to an initial value, and the first time window starts running.

[0363] As an embodiment, when the first time window is running, the value of the first time window is updated at every time interval.

[0364] As an embodiment, the time interval is 0.5 ms (milliseconds).

[0365] As an embodiment, the time interval is 1 ms.

[0366] As an embodiment, the time interval is the duration of one symbol.

[0367] As an embodiment, the time interval is the duration of one time slot.

[0368] As an embodiment, the initial value of the first time window is 0, and the value of updating the first time window is to add 1 to the value of the first time window; when the value of the first time window is the expiration value of the first time window, the first time window expires.

[0369] As an embodiment, the initial value of the first time window is the expiration value of the first time window, and the phrase updating the value of the first time window is to reduce the value of the first time window by 1; when the value of the first time window is 0, the first time window expires.

[0370] As an embodiment, when the first time window expires, the first time window stops running.

[0371] As an embodiment, the expiration value of the first time window is configurable.

[0372] As an embodiment, the expiration value of the first time window is preconfigured.

[0373] As an embodiment, the first action is to stop evaluating whether the first condition set for the second cell is met in the first time window.

[0374] As an embodiment, in response to receiving the first signaling, the first time window is started, and when the first time window is running, the evaluation of whether the first condition set for the second cell is met is stopped.

[0375] As an embodiment, stopping evaluating whether the first condition set for the second cell is satisfied includes: continuing to measure at least one of the channel quality of the first cell or continuing to measure the channel quality in the second cell.

[0376] As an embodiment, the stopping of evaluating whether the first condition set for the second cell is satisfied includes: monitoring PDCCH on the first cell.

[0377] As an embodiment, stopping evaluating whether the first condition set for the second cell is met includes: sending UL-SCH (Uplink Shared Channel) on the first cell, or receiving DL-SCH (Downlink Shared Channel).

[0378] As an embodiment, stopping evaluating whether the first condition set for the second cell is satisfied includes: initiating a random access procedure on the first cell.

[0379] As an embodiment, the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met.

[0380] As an embodiment, as a response to receiving the first signaling, the first time window is started, and whether the first condition set for the second cell is met is continued to be evaluated in the first time window, and switching to the second cell is not triggered in the first time window when the first condition set for the second cell is met.

[0381] As a sub-embodiment of the above embodiment, not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: not applying the candidate configuration of the second cell in the first time window.

[0382] As a sub-embodiment of the above embodiment, not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: not sending UL-SCH on the second cell in the first time window.

[0383] As an embodiment, continuing to evaluate whether the first condition set for the second cell is met in the first time window, and not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: continuing to evaluate whether the first condition set for the second cell is met in the first time window.

[0384] As an embodiment, continuing to evaluate whether the first condition set for the second cell is met in the first time window, and not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: monitoring PDCCH on the first cell in the first time window.

[0385] As an embodiment, continuing to evaluate whether the first condition set for the second cell is met in the first time window, and not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: sending UL-SCH on the first cell in the first time window, or receiving DL-SCH.

[0386] As an embodiment, continuing to evaluate whether the first condition set for the second cell is met in the first time window, and not triggering switching to the second cell in the first time window when the first condition set for the second cell is met includes: initiating a random access process on the first cell in the first time window.

[0387] As an embodiment, the first signaling triggers the early uplink synchronization process on the second cell.

[0388] As an embodiment, the first node is configured with EarlyUlSyncConfig (early uplink synchronization configuration).

[0389] As an embodiment, the early uplink synchronization process on the second cell includes: initiating a random access process on the second cell.

[0390] As an embodiment, the early uplink synchronization process on the second cell includes: sending a second random access sequence on the second cell.

[0391] As an embodiment, the early uplink synchronization process on the second cell includes: sending a PRACH on the second cell, wherein the PRACH carries the second random access sequence.

[0392] As an embodiment, the early uplink synchronization process on the second cell includes: sending the second random access sequence according to the method described in Chapter 5.1 of protocol 38.321 of the 3GPP standard.

[0393] As an embodiment, the first signaling indicates an uplink carrier for sending PRACH, and the uplink carrier includes UL (UpLink) or SUL (Supplementary UpLink).

[0394] As an embodiment, the first signaling indicates a resource for non-contention random access (Contention-Free Random Access, CFRA).

[0395] As an embodiment, the random access resources for non-contention include SS / PBCH index, PRACH mask index, and random access sequence index.

[0396] As a sub-embodiment of the foregoing embodiment, the random access sequence index indicates the second random access sequence.

[0397] Attachment of Example 5 Figure 5 In the step S514, the first node N51 sends the second random access sequence on the second cell, and the second receiver N53 receives the second random access sequence on the second cell.

[0398] As an embodiment, the first node N51 completes the random access process after sending the second random access sequence.

[0399] As an embodiment, the random access resource for non-contention is configured by the base station of the second cell, and then forwarded to the base station of the first cell and sent to the first node through the first cell.

[0400] Example 6

[0401] Embodiment 6 illustrates a schematic diagram of a first signaling and a first time window according to an embodiment of the present application, as shown in the attached figure. Figure 6 shown.

[0402] Embodiment 6 is applicable to a scenario in which the first condition set for the second cell is satisfied when the first time window expires.

[0403] As an embodiment, the second signaling is not received when the first time window is running.

[0404] As an embodiment, as a response to receiving the first signaling, the first action is performed; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; when the first time window expires, if the first condition set for the second cell is still met, switch to the second cell.

[0405] Example 7

[0406] Embodiment 7 illustrates a schematic diagram of a first signaling and a first time window according to an embodiment of the present application, as shown in the attached figure. Figure 7 shown.

[0407] Embodiment 7 is applicable to a scenario in which the first condition set for the second cell is not met when the first time window expires.

[0408] As an embodiment, the second signaling is not received when the first time window is running.

[0409] As an embodiment, as a response to receiving the first signaling, the first action is performed; the first action is to stop evaluating whether the first set of conditions for the second cell is met in the first time window; when the first time window expires, the first set of conditions for the second cell is not met.

[0410] As an embodiment, as a response to receiving the first signaling, the first action is performed; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; when the first time window expires, the first condition set for the second cell is not met.

[0411] As a sub-embodiment of the above two embodiments, after the first time window expires, it continues to be evaluated whether the first condition set for the second cell is satisfied.

[0412] Example 8

[0413] Embodiment 8 illustrates a schematic diagram of the first signaling, the second signaling and the first time window according to an embodiment of the present application, as shown in the attached figure. Figure 8 shown.

[0414] As an embodiment, a second signaling is received when the first time window is running, and the second signaling indicates switching to the second cell.

[0415] As an embodiment, the first set of conditions for the second cell is not met before receiving the second signaling.

[0416] As an embodiment, the second signaling is RRC layer signaling.

[0417] As an embodiment, the second signaling is RRCReconfiguration including ReconfigurationWithSync.

[0418] As an embodiment, the second signaling is MAC CE.

[0419] As an embodiment, the second signaling is LTM Cell Switch Command (cell switching command) MACCE.

[0420] As an embodiment, the second signaling indicates the second cell.

[0421] As an embodiment, in response to receiving the second signaling, the first time window is stopped and switched to the second cell.

[0422] As an embodiment, the first time window stops at the first symbol after the end of PDSCH reception, and the PDSCH carries the second signaling.

[0423] As an embodiment, the first time window stops at the first symbol after the end of PUCCH transmission, the PUCCH carries HARQ (Hybrid Automatic Repeat Request) feedback for PDSCH, the PDSCH carries the second signaling, and the HARQ feedback is ACK (ACKnowledgement).

[0424] As an embodiment, stopping the first time window includes: the value of the first time window is less than the expiration value of the first time window.

[0425] Example 9

[0426] Embodiment 9 illustrates a signal processing flow chart in the first node according to an embodiment of the present application, as shown in the attached Fig. 9 shown.

[0427] In Example 9, in step S901, determine whether the first time window has expired, if so, execute step S903, if not, execute step S902; in step S902, determine whether the second signaling is received, if yes, execute step S904, if not, jump back to step S901; in step S904, stop the first time window; in step S905, switch to the second cell; in step S903, determine whether the first condition set for the second cell is met, if yes, execute step S905, if not, execute step S906; in step S906, continue to evaluate whether the first condition set for the second cell is met.

[0428] Example 10

[0429] Embodiment 10 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Fig.10 As shown in the attached Fig.10 In the example, the first node N101 and the second receiver N102 communicate via the second cell.

[0430] for First node N101 , in step S1011, a target signal is sent on the second cell.

[0431] for Second receiver N102 , in step S1021, a target signal is received on the second cell.

[0432] As an embodiment, the second receiver N102 belongs to the second node.

[0433] As a sub-embodiment of the above embodiment, the second node maintains the second cell.

[0434] As an embodiment, the second receiver N102 belongs to a third node, and the third node is a node other than the second node.

[0435] As a sub-embodiment of the above embodiment, the third node maintains the second cell.

[0436] As an embodiment, the second node is a base station.

[0437] As an embodiment, the third node is a base station.

[0438] As an embodiment, the first node is a UE.

[0439] As an embodiment, the first node is a terminal.

[0440] As an embodiment, the switching to the second cell includes sending a target signal on the second cell.

[0441] As a sub-embodiment of the above embodiment, the second signaling is used to trigger the switching to the second cell.

[0442] As a sub-embodiment of the above embodiment, the first condition set for the second cell is satisfied and is used to trigger the switching to the second cell; wherein the first time window expires.

[0443] As an embodiment, the target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied.

[0444] As an embodiment, the candidate configuration of the second cell begins to be applied after the first node switches to the second cell.

[0445] As an embodiment, the candidate configuration for the second cell being applied includes: the second cell becoming a serving cell of the first node.

[0446] As an embodiment, the application of the candidate configuration for the second cell includes: applying the candidate configuration for the second cell to perform at least one of uplink transmission and downlink reception.

[0447] As an embodiment, after applying the candidate configuration for the second cell, a first operation set is started; wherein the first operation set includes at least one of monitoring PDCCH (Physical Downlink Control Channel) on the second cell, monitoring PDCCH used to schedule the second cell, and sending PRACH (Physical Random Access Channel) on the second cell.

[0448] As an embodiment, along with applying the candidate configuration for the second cell, the configuration for the first cell is stopped from being applied.

[0449] As an embodiment, when performing the early uplink synchronization process on the second cell, the candidate configuration for the second cell is not applied.

[0450] As an embodiment, before switching to the second cell, the candidate configuration for the second cell is not applied.

[0451] As an embodiment, the target signal carries one of the first random access sequence or the second RRC signaling.

[0452] As an embodiment, the target signal carries a first random access sequence.

[0453] As a sub-embodiment of the above embodiment, the target signal is sent via PRACH.

[0454] As an embodiment, the first RRC signaling indicates the air interface resources for sending the first random access sequence on the second cell.

[0455] As an embodiment, the air interface resources include UL (Uplink) / SUL (Supplementary UpLink) indication.

[0456] As an embodiment, the air interface resources include SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) indexes.

[0457] As an embodiment, the air interface resources include a PRACH mask index.

[0458] As an embodiment, the air interface resources include an index of the first random access sequence.

[0459] As an embodiment, the index of the first random access sequence uniquely identifies the first random access sequence.

[0460] As an embodiment, the first random access sequence is a random access preamble.

[0461] As an embodiment, the first random access sequence is a signature sequence.

[0462] As an embodiment, the first random access sequence is a Gold sequence.

[0463] As an embodiment, the first random access sequence is an M sequence.

[0464] As an embodiment, the first random access sequence is a ZC (Zadoff–Chu) sequence.

[0465] As an embodiment, the first random access sequence is a random access sequence selected from contention-based random access sequences.

[0466] As an embodiment, the first random access sequence is not a random access sequence selected from contention-based random access sequences.

[0467] As a sub-embodiment of the above embodiment, the first random access sequence is dedicated to the first node.

[0468] As an embodiment, the target signal carries a second RRC signaling.

[0469] As a sub-embodiment of the above embodiment, the target signal is sent via PUSCH.

[0470] As an embodiment, the second RRC signaling is RRCReconfigurationComplete (RRC reconfiguration completed).

[0471] As an embodiment, the second RRC signaling is a response to the first RRC signaling.

[0472] As an embodiment, the second RRC signaling indicates that switching to the second cell is completed.

[0473] As an embodiment, whether the target signal carries the first random access sequence or the second RRC signaling depends on whether the first information block is received within the first time window.

[0474] As an embodiment, when the first information block is not received within the first time window, the target signal carries the first random access sequence; when the first information block is received within the first time window, the target signal carries the second RRC signaling.

[0475] As a sub-embodiment of the above embodiment, the first node is not configured with uplink timing measurement (Timing Advance Measurement) for the second cell.

[0476] As a sub-embodiment of the above embodiment, the first node fails to successfully measure uplink timing for the second cell.

[0477] As an embodiment, the first information block is received on the first cell.

[0478] As an embodiment, the PDCCH is not monitored on the second cell before switching to the second cell.

[0479] As an embodiment, before switching to the second cell, no information other than the system information block is received on the second cell.

[0480] As an embodiment, the first information block is an information block outside a system information block (System Information Block, SIB).

[0481] As an embodiment, the first information block includes a timing advance command for the second cell.

[0482] As an embodiment, the first information block is a TAcommand (timing advance command) MAC CE.

[0483] As an embodiment, the first information block is an absolute TA command (absolute timing advance command) MAC CE.

[0484] As an embodiment, the first information block is a candidate TA command (candidate timing advance command) MAC CE.

[0485] As an embodiment, the first information block is LTM Cell Switch CommandMAC CE.

[0486] As an embodiment, the first information block is RAR (Random Access Response).

[0487] As an embodiment, the first information block includes a TA command (timing advance command).

[0488] As an embodiment, the first information block is TAcommand.

[0489] As an embodiment, the first information block indicates the second cell.

[0490] As an embodiment, the first information block includes the identifier of the second cell.

[0491] As an embodiment, the first information block includes a candidate identifier, and the candidate identifier indicates the candidate configuration of the second cell.

[0492] As an embodiment, the timing advance command for the second cell depends on the early uplink synchronization process on the second cell.

[0493] As a sub-embodiment of the above embodiment, reception of the second random access sequence is used to trigger sending of the timing advance.

[0494] As a sub-embodiment of the above embodiment, the sending of the timing advance is caused by the sending of the second random access sequence.

[0495] As a sub-embodiment of the above embodiment, after receiving the second random access sequence from the second cell, the base station of the second cell can obtain a timing advance command of the sender of the second random access sequence, and the base station of the second cell sends the timing advance command to the base station of the first cell, and sends it to the sender of the second random access sequence through the base station of the first cell.

[0496] As an embodiment, when the first information block is not received within the first time window, the first node does not obtain the uplink timing of the uplink transmission for the second cell.

[0497] As an embodiment, the target signal carrying the first random access sequence includes: initiating a random access process on the second cell, the random access process including sending the target signal.

[0498] As an embodiment, when the first information block is received within the first time window, the first node obtains the uplink timing of the uplink transmission for the second cell.

[0499] As an embodiment, the timing advance command is used by the first node for uplink timing when performing uplink transmission on the second cell.

[0500] As an embodiment, the timing advance command is applied to a TAG (timing advance group) to which the second cell belongs.

[0501] As an embodiment, the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0502] As an embodiment, the timing advance command is applied to the uplink timing of the target signal, the target signal is PUSCH, and the target signal carries the second RRC signaling.

[0503] As a sub-embodiment of the above two embodiments, the timing advance command is used to send the uplink timing of the target signal.

[0504] As a sub-embodiment of the above two embodiments, the timing advance command indicates an advance value of a start time of an uplink time unit for sending the target signal relative to a corresponding downlink time unit.

[0505] As an embodiment, the time unit is a frame, a subframe or a time slot.

[0506] As an embodiment, the first node obtains the downlink synchronization of the second cell according to the downlink synchronization signal; the timing advance value indicated by the timing advance command is t; if the uplink transmission time slot of the target signal is n, the first node starts sending the target signal at a time t before the start time of the corresponding downlink time slot n.

[0507] As an embodiment, the timing advance value indicated by the timing advance command is related to the subcarrier occupied by the target signal.

[0508] As an embodiment, the timing advance value indicated by the timing advance command is N TA =T A ·16·64 / 2 μ ; wherein the T A is the index included in the timing advance command, the 2 μ ·15 kHz (kilohertz) is the subcarrier spacing (SCS) of the second cell.

[0509] As an example, the T A A positive integer less than 4096.

[0510] As an example, the T A The value of is 0, 1, 2, ..., 3846.

[0511] As an embodiment, μ is a positive integer not greater than 10.

[0512] As an embodiment, the value of μ is 0, 1, 2, 3, 4, 5, 6.

[0513] Embodiment 11

[0514] Embodiment 11 illustrates a signal processing flow chart in the first node according to an embodiment of the present application, as shown in the attached Fig.11 Attached Fig.11 In step S1101, it is determined whether the first information block is received when the first time window is running. If yes, step S1103 is executed, if not, step S1102 is executed; in step S1102, the target signal carries a first random access sequence; in step S1103, the target signal carries a second RRC signaling.

[0515] As an embodiment, receiving the first information block when the first time window is running includes: receiving the second signaling in the first time window, and the second signaling carries the first information block, and the first information block is a TA command; the switching to the second cell includes sending the target signal on the second cell, and the target signal carries the second RRC signaling.

[0516] As an embodiment, not receiving the first information block when the first time window is running includes: receiving the second signaling in the first time window, but the second signaling does not carry the first information block, and the first information block is a TA command; the switching to the second cell includes sending the target signal on the second cell, and the target signal carries the first random access sequence.

[0517] As an embodiment, receiving the first information block when the first time window is running includes: not receiving the second signaling in the first time window, but receiving the first information block; when the first condition set for the second cell is met when the first time window expires, the switching to the second cell includes sending the target signal on the second cell, and the target signal carries the second RRC signaling.

[0518] As an embodiment, not receiving the first information block when the first time window is running includes: not receiving the second signaling in the first time window, and not receiving the first information block; when the first condition set for the second cell is met when the first time window expires, the switching to the second cell includes sending the target signal on the second cell, and the target signal carries the first random access sequence.

[0519] Example 12

[0520] 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 the attached figure. Fig.12 As shown in the attached Fig.12 In the embodiment, the first node processing device 12 includes a first receiver 1201 and a first processor 1202; the first node 1200 is a UE, or the first node 1200 is a terminal.

[0521] In embodiment 12, a first receiver 1201 receives a first RRC signaling, wherein the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; a first processor 1202, as a response to receiving the first RRC signaling, starts to evaluate whether a first condition set for a second cell is met, wherein the second cell is one of the at least one switching candidate cells; the first receiver 1201 receives a first signaling; the first processor 1202, as a response to receiving the first signaling, performs a first action, wherein the first action depends on the first condition set; wherein the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; and the first cell is a service cell of the first node.

[0522] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window.

[0523] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein, the first action is for the first time window; the first action is to stop evaluating whether the first condition set for the second cell is met in the first time window.

[0524] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein, the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met.

[0525] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the first processor 1202 switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met.

[0526] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first processor 1202 continues to evaluate whether the first condition set for the second cell is met; wherein the first time window expires and the first condition set for the second cell is not met.

[0527] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first receiver 1201, receives a second signaling while the first time window is running, and the second signaling indicates switching to the second cell; the first processor 1202, in response to receiving the second signaling, stops the first time window and switches to the second cell.

[0528] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the first processor 1202 switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met; the switching to the second cell includes sending a target signal on the second cell; wherein the target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling.

[0529] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first receiver 1201, receives a second signaling while the first time window is running, and the second signaling indicates switching to the second cell; the first processor 1202, in response to receiving the second signaling, stops the first time window and switches to the second cell; the switching to the second cell includes sending a target signal on the second cell; wherein the target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling.

[0530] As an embodiment, the first processor 1202, as a response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the first processor 1202 switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met; the switching to the second cell includes sending a target signal on the second cell; wherein the target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling; whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window; wherein the first information block includes a timing advance command for the second cell; the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0531] As an embodiment, the first processor 1202, in response to receiving the first signaling, starts a first time window; wherein the first action is for the first time window; the first receiver 1201, receives a second signaling while the first time window is running, and the second signaling indicates switching to the second cell; the first processor 1202, in response to receiving the second signaling, stops the first time window and switches to the second cell; the switching to the second cell includes sending a target signal on the second cell; wherein the target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling; whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window; wherein the first information block includes a timing advance command for the second cell; the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0532] As an embodiment, the first receiver 1201 includes the attached Figure 4 The receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 and controller / processor 459.

[0533] As an embodiment, the first receiver 1201 includes the attached Figure 4 At least one of the receiver 454 (including antenna 452), the receive processor 456, the multi-antenna receive processor 458 or the controller / processor 459.

[0534] As an embodiment, the first processor 1202 includes the attached Figure 4 The receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 and controller / processor 459.

[0535] As an embodiment, the first processor 1202 includes the attached Figure 4 At least one of the receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 or controller / processor 459.

[0536] As an embodiment, the first processor 1202 includes the attached Figure 4 The transmitter 454 (including antenna 452), transmit processor 468, multi-antenna transmit processor 457 and controller / processor 459.

[0537] As an embodiment, the first processor 1202 includes the attached Figure 4 At least one of the transmitter 454 (including antenna 452), the transmit processor 468, the multi-antenna transmit processor 457 or the controller / processor 459.

[0538] As an embodiment, the first processor 1202 includes the attached Figure 4 Middle controller / processor 459.

[0539] Embodiment 13

[0540] 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 the attached figure. Fig.13 As shown in the attached Fig.13 In the embodiment, the second receiver 1302 in the dotted box is optional. The second node processing device 1300 includes a first transmitter 1301, or the second node processing device 1300 includes a first transmitter 1301 and a second receiver 1302; the second node 1300 is a base station.

[0541] In embodiment 13, a first transmitter 1301 sends a first RRC signaling, wherein the first RRC signaling indicates at least one switching candidate cell and at least one corresponding candidate configuration; sends a first signaling; wherein, as a response to the first RRC signaling being received, an evaluation is started on whether a first condition set for a second cell is satisfied, and the second cell is one of the at least one switching candidate cells; as a response to the first signaling being received, a first action is performed, and the first action depends on the first condition set; the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of the recipient of the first signaling.

[0542] As an embodiment, in response to the first signaling being received, a first time window is started; wherein the first action is for the first time window.

[0543] As an embodiment, in response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; the first action is to stop evaluating whether the first condition set for the second cell is met in the first time window.

[0544] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein, the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met.

[0545] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the recipient of the first signaling switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met.

[0546] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein, the first action is for the first time window; whether the first condition set for the second cell is met is continued to be evaluated; wherein, the first time window expires and the first condition set for the second cell is not met.

[0547] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; the first transmitter 1301 sends a second signaling when the first time window is running, and the second signaling indicates switching to the second cell; wherein, as a response to the second signaling being received, the first time window is stopped, and the recipient of the first signaling switches to the second cell.

[0548] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the receiver of the first signaling switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met; a second receiver 1302 receives a target signal on the second cell; wherein the switching to the second cell includes receiving the target signal on the second cell; the target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling.

[0549] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; a second signaling is sent while the first time window is running, and the second signaling indicates switching to the second cell; wherein, as a response to the second signaling being received, the first time window is stopped, and the recipient of the first signaling switches to the second cell; a second receiver 1302 receives a target signal on the second cell; wherein the switching to the second cell includes receiving the target signal on the second cell; the target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling.

[0550] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; the first action is to continue to evaluate whether the first condition set for the second cell is met in the first time window, and not trigger switching to the second cell in the first time window when the first condition set for the second cell is met; the receiver of the first signaling switches to the second cell; wherein the first time window expires and the first condition set for the second cell is met; a second receiver 1302 receives a target signal on the second cell; wherein the switching to the second cell includes receiving the target signal on the second cell; the target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling; whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window; wherein the first information block includes a timing advance command for the second cell; the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0551] As an embodiment, as a response to the first signaling being received, a first time window is started; wherein the first action is for the first time window; a second signaling is sent while the first time window is running, the second signaling indicating switching to the second cell; wherein, as a response to the second signaling being received, the first time window is stopped, and the receiver of the first signaling switches to the second cell; a second receiver 1302 receives a target signal on the second cell; wherein the switching to the second cell includes receiving the target signal on the second cell; the target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling; whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window; wherein the first information block includes a timing advance command for the second cell; the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

[0552] As an embodiment, the first transmitter 1301 includes the attached Figure 4 The transmitter 418 (including antenna 420), transmit processor 416, multi-antenna transmit processor 471 and controller / processor 475.

[0553] As an embodiment, the first transmitter 1301 includes the attached Figure 4 At least one of the transmitter 418 (including antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475.

[0554] As an embodiment, the second receiver 1302 includes the attached Figure 4 The receiver 418 (including antenna 420), receive processor 470, multi-antenna receive processor 472 and controller / processor 475.

[0555] As an embodiment, the second receiver 1302 includes the attached Figure 4 At least one of the receiver 418 (including the antenna 420), the receive processor 470, the multi-antenna receive processor 472 or the controller / processor 475.

[0556] A person of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of software and hardware combination. The first type of communication node or UE or terminal in the present application includes but is not limited to mobile phones, tablet computers, notebooks, Internet cards, low-power devices, eMTC (enhanced Machine Type Communication, enhanced machine type communication) equipment, NB-IoT equipment, vehicle-mounted communication equipment, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication equipment. The second type of communication node or base station or network side equipment in the present application includes but is not limited to macrocellular base stations, microcellular base stations, home base stations, relay base stations, eNB, gNB, transmission and reception nodes TRP (Transmission and Reception Point, transmission and reception point), relay satellites, satellite base stations, aerial base stations and other wireless communication equipment.

[0557] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method in a first node for wireless communication, characterized in that: include: receiving a first RRC signaling indicating at least one handover candidate cell and at least one corresponding candidate configuration; In response to receiving the first RRC signaling, start evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one handover candidate cells; receiving a first signaling; In response to receiving the first signaling, performing a first action, the first action being dependent on the first set of conditions; Among them, the first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell is worse than a first threshold or the channel quality of the second cell is better than a second threshold; the first cell is a service cell of the first node.

2. The method in the first node according to claim 1, characterized in that: include: In response to receiving the first signaling, starting a first time window; The first action is for the first time window.

3. The method in the first node according to claim 2, characterized in that: The first action is to stop evaluating whether the first set of conditions for the second cell is met in the first time window.

4. The method in the first node according to claim 2, characterized in that: The first action is to continue evaluating whether the first condition set for the second cell is met in the first time window, and not trigger handover to the second cell in the first time window when the first condition set for the second cell is met.

5. The method in the first node according to claim 4, characterized in that: include: Switching to the second cell; The first time window expires and the first condition set for the second cell is met.

6. The method in the first node according to any one of claims 2 to 4, characterized in that: include: Continue to evaluate whether the first condition set for the second cell is met; The first time window expires, and the first condition set for the second cell is not met.

7. The method in the first node according to any one of claims 2 to 4, characterized in that: include: receiving a second signaling while the first time window is running, the second signaling indicating switching to the second cell; In response to receiving the second signaling, the first time window is stopped and the second cell is switched.

8. The method in the first node according to claim 5 or 7, characterized in that: The switching to the second cell includes sending a target signal on the second cell; The target signal is the first uplink signal sent on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of the first random access sequence or the second RRC signaling.

9. The method in the first node according to claim 8, characterized in that: Whether the target signal carries the first random access sequence or the second RRC signaling depends on whether a first information block is received within the first time window; The first information block includes a timing advance command for the second cell; and the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

10. A terminal, characterized in that: The terminal includes: one or more processors and a memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, where the computer program codes include computer instructions. The one or more processors call the computer instructions to enable the terminal to execute the method according to any one of claims 1 to 9.

11. A method in a second node for wireless communication, characterized in that: include: Sending a first RRC signaling, where the first RRC signaling indicates at least one handover candidate cell and at least one corresponding candidate configuration; Sending a first signaling; Wherein, as a response to the first RRC signaling being received, whether a first condition set for a second cell is satisfied is evaluated, and the second cell is one of the at least one handover candidate cells; as a response to the first signaling being received, a first action is performed, and the first action depends on the first condition set; The first signaling triggers an early uplink synchronization process (early UL synchronization) on the second cell; the first condition set includes at least one of the channel quality of the first cell being worse than a first threshold or the channel quality of the second cell being better than a second threshold; the first cell is a serving cell of a recipient of the first signaling.

12. The method in the second node according to claim 11, characterized in that: In response to the first signaling being received, a first time window is started; The first action is for the first time window.

13. The method in the second node according to claim 12, characterized in that: The first action is to stop evaluating whether the first set of conditions for the second cell is met in the first time window.

14. The method in the second node according to claim 12, characterized in that: The first action is to continue evaluating whether the first condition set for the second cell is met in the first time window, and not trigger handover to the second cell in the first time window when the first condition set for the second cell is met.

15. The method in the second node according to claim 14, characterized in that: The receiver of the first signaling switches to the second cell; The first time window expires and the first condition set for the second cell is met.

16. The method in the second node according to any one of claims 12 to 14, characterized in that: Whether the first set of conditions for the second cell is satisfied is continuously evaluated; The first time window expires, and the first condition set for the second cell is not met.

17. The method in the second node according to any one of claims 12 to 14, characterized in that: include: Sending a second signaling when the first time window is running, wherein the second signaling indicates switching to the second cell; As a response to the second signaling being received, the first time window is stopped, and the receiver of the first signaling is switched to the second cell.

18. The method in the second node according to claim 15 or 17, characterized in that: include: receiving a target signal on the second cell; wherein the switching to the second cell includes receiving the target signal on the second cell; The target signal is the first uplink signal received on the second cell after the candidate configuration for the second cell is applied; the target signal carries one of a first random access sequence or a second RRC signaling.

19. The method in the second node according to claim 18, characterized in that: Whether the target signal carries the first random access sequence or the second RRC signaling depends on whether the first information block is received within the first time window; The first information block includes a timing advance command for the second cell; and the uplink timing of the target signal carrying the second RRC signaling depends on the timing advance command.

20. A base station, characterized in that: The base station includes: one or more processors and a memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, where the computer program codes include computer instructions, and the one or more processors call the computer instructions to enable the base station to perform the method according to any one of claims 11 to 19.

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