CN118265096A

CN118265096A - Cell switching method, device, terminal and base station

Info

Publication number: CN118265096A
Application number: CN202311825656.2A
Authority: CN
Inventors: 骆亚娟; 李辉; 高秋彬; 苏昕; 王达; 宋磊
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-12-27
Filing date: 2023-12-27
Publication date: 2024-06-28

Abstract

The application discloses a cell switching method, a cell switching device, a terminal and a base station, wherein the method comprises the following steps: the terminal respectively transmits an uplink channel/signal for measurement to the source base station and at least one candidate target base station; the terminal receives a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell; and the terminal switches to the target cell according to the cell switching command, wherein the target cell is determined based on the uplink channel/signal measurement, and the time delay brought by the switching process is reduced by determining to switch the target cell by adopting the uplink channel/signal measurement. Meanwhile, the terminal does not need to report the measurement result, and the air interface overhead is greatly reduced.

Description

Cell switching method, device, terminal and base station

Technical Field

The application belongs to the technical field of communication, and particularly relates to a cell switching method, a cell switching device, a terminal and a base station.

Background

The prior cell switching is completed by determining the target switching cell by the base station according to the measurement result based on the downlink reference signals of the candidate target cells which are measured by the terminal according to the configuration of the base station and reported to the base station. In the process, the terminal needs to measure and report the downlink reference signals of each candidate target cell to the base station, so that the measurement time delay is large, the complexity of the terminal is high, and the overhead of the air interface signaling is large.

Disclosure of Invention

The embodiment of the application provides a cell switching method, a cell switching device, a terminal and a base station, which solve the problems of larger measurement time delay and larger air interface signaling overhead in the existing cell switching process.

In a first aspect, a cell handover method is provided, including:

the terminal respectively transmits an uplink channel/signal for measurement to the source base station and at least one candidate target base station;

the terminal receives a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell;

And the terminal is switched to the target cell according to the cell switching command, and the target cell is determined based on the uplink channel/signal measurement.

Optionally, the method further comprises:

the terminal receives first information, wherein the first information is used for configuring uplink channels/signals used for measurement in candidate target cells, and the first information comprises association relations between resource sets of the uplink channels/signals and indexes of the candidate target cells.

Optionally, the terminal sends an uplink channel/signal for measurement to at least one candidate target base station, including:

The terminal sends an uplink channel/signal for measurement to at least one candidate target base station through a target time-frequency resource;

The target time-frequency resource is a time-frequency resource reserved for all candidate target cells or a time-frequency resource of the candidate target cells configured by a network side.

Optionally, the method further comprises:

the terminal receives second information, wherein the second information is used for indicating a target time-frequency resource of a triggered aperiodic uplink channel/signal;

The second information includes indication information, where the indication information is used to indicate an aperiodic uplink channel/signal resource triggering parameter, where the aperiodic uplink channel/signal resource triggering parameter corresponds to a time-frequency resource set of an uplink channel/signal, and the time-frequency resource set of the uplink channel/signal is associated with a candidate target cell index;

Or the second information carries the index of the candidate target cell;

Or the second information comprises indexes of candidate target cells and non-periodic uplink channel/signal resource triggering parameters, wherein the non-periodic uplink channel/signal resource triggering parameters are associated with a time-frequency resource set of an uplink channel/signal.

The terminal transmits an uplink channel/signal for measurement to at least one candidate target base station through a target transmission beam;

wherein the target transmit beam is a transmit beam corresponding to a target receive beam, the target receive beam comprising at least one of:

The method comprises the steps that a receiving beam of a target synchronous signal block SSB is used for acquiring a master information block MIB during initial downlink synchronization;

activating the uplink channel/signal space association relation of the candidate target cell configured in the service cell;

a receiving beam of a target SSB or a channel state information reference signal CSI-RS, which is an SSB or CSI-RS included in a path loss PL reference signal RS of an uplink channel/signal of a candidate target cell;

and receiving a wave beam of a Physical Downlink Control Channel (PDCCH), wherein the PDCCH is used for bearing Downlink Control Information (DCI) triggering an aperiodic uplink channel/signal.

Optionally, the correspondence between the target sending beam and the target receiving beam is determined by a protocol convention, a network side configuration, or the terminal.

The terminal receives third information, wherein the third information is used for indicating independent closed loop power control and/or is used for indicating adjustment of corresponding parameter values in a power calculation formula according to a Transmit Power Control (TPC) command domain, and the third information carries candidate target cell indexes;

determining target transmission power according to the third information and the power calculation formula;

The terminal transmits an uplink channel/signal for measurement to at least one candidate target base station through the target transmission power.

In a second aspect, a cell handover method is provided, including:

The source base station measures an uplink channel/signal to obtain a first measurement result;

The source base station obtains a second measurement result obtained by measuring the uplink channel/signal by at least one candidate target base station;

the source base station determines a target cell according to the first measurement result and the second measurement result;

and the source base station sends a cell switching command according to the information of the target cell.

Optionally, the determining, by the source base station, the target cell according to the first measurement result and the second measurement result includes:

The source base station determines a target cell according to the first measurement result, the second measurement result and a target cell judgment criterion;

The target cell decision criteria include:

if the second measurement result is larger than the first measurement result, and the first measurement result is larger than a switching threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell;

Or alternatively

And if the second measurement result is larger than the first measurement result, the first measurement result is larger than a switching threshold, and the transmission power of the uplink channel/signal transmitted by the terminal is smaller than or equal to a power threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell.

Optionally, the determining, by the source base station, the target cell according to the first measurement result, the second measurement result and a preset handover criterion includes:

acquiring the times of meeting the switching conditions;

and under the condition that the number of times meeting the switching condition is larger than or equal to a number threshold, the source base station determines a target cell according to the first measurement result, the second measurement result and a preset switching criterion.

Optionally, the method further comprises:

The source base station sends first information, wherein the first information is used for configuring uplink channels/signals used for measurement in candidate target cells, and the first information comprises association relations between resource sets of the uplink channels/signals and indexes of the candidate target cells.

Optionally, the method further comprises:

The source base station sends second information, wherein the second information is used for indicating a target time-frequency resource of a triggered aperiodic uplink channel/signal;

Or the second information carries the index of the candidate target cell;

Optionally, the method further comprises:

the source base station sends third information, wherein the third information is used for indicating independent closed loop power control and/or indicating to adjust corresponding parameter values in a power calculation formula according to a TPC command domain, and the third information carries candidate target cell indexes.

Optionally, the method further comprises:

the source base station sends fourth information, wherein the fourth information is used for indicating the corresponding relation between a target sending beam and a target receiving beam, and the target sending beam is used for sending an uplink channel/signal for measurement to at least one candidate target base station;

Wherein the target receive beam comprises at least one of:

A receiving beam of a target SSB, where the target SSB is configured to acquire MIB at initial downlink synchronization;

A reception beam of a target SSB or CSI-RS, which is an SSB or CSI-RS included in a PL RS of an uplink channel/signal of a candidate target cell;

And receiving a beam of a PDCCH, wherein the PDCCH is used for bearing DCI triggering an aperiodic uplink channel/signal.

In a third aspect, a cell switching apparatus is provided, which is applied to a terminal, and includes:

A first transmitting module, configured to transmit uplink channels/signals for measurement to a source base station and at least one candidate target base station, respectively;

The first receiving module is used for receiving a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell;

And the switching module is used for switching to the target cell according to the cell switching command.

In a fourth aspect, a cell switching apparatus is provided, which is applied to a source base station, and includes:

the first measurement module is used for measuring the uplink channel/signal to obtain a first measurement result;

the first acquisition module is used for acquiring a second measurement result obtained by measuring the uplink channel/signal by at least one candidate target base station;

a first determining module, configured to determine a target cell according to the first measurement result and the second measurement result;

and the second sending module is used for sending a cell switching command according to the information of the target cell.

In a fifth aspect, there is provided a terminal comprising: memory, transceiver, processor; wherein the memory is used for storing a computer program; the transceiver is used for respectively transmitting uplink channels/signals for measurement to the source base station and at least one candidate target base station; the transceiver is further configured to receive a cell switching command sent by the source base station, where the cell switching command carries information of a target cell; the processor is configured to switch to the target cell based on the cell switch command, the target cell being determined based on the uplink channel/signal measurements.

Optionally, the transceiver is further configured to receive first information, where the first information is used to configure an uplink channel/signal used for measurement in the candidate target cell, and the first information includes an association relationship between a resource set of the uplink channel/signal and an index of the candidate target cell.

Optionally, the transceiver is further configured to send an uplink channel/signal for measurement to at least one candidate target base station through a target time-frequency resource; the target time-frequency resource is a time-frequency resource reserved for all candidate target cells or a time-frequency resource of the candidate target cells configured by a network side.

Optionally, the transceiver is further configured to receive second information, where the second information is used to indicate a target time-frequency resource of the triggered aperiodic uplink channel/signal; the second information includes indication information, where the indication information is used to indicate an aperiodic uplink channel/signal resource triggering parameter, where the aperiodic uplink channel/signal resource triggering parameter corresponds to a time-frequency resource set of an uplink channel/signal, and the time-frequency resource set of the uplink channel/signal is associated with a candidate target cell index; or the second information carries the index of the candidate target cell; or the second information comprises indexes of candidate target cells and non-periodic uplink channel/signal resource triggering parameters, wherein the non-periodic uplink channel/signal resource triggering parameters are associated with a time-frequency resource set of an uplink channel/signal.

Optionally, the transceiver is further configured to transmit the uplink channel/signal for measurement to at least one candidate target base station via a target transmit beam; wherein the target transmit beam is a transmit beam corresponding to a target receive beam, the target receive beam comprising at least one of: the method comprises the steps that a receiving beam of a target synchronous signal block SSB is used for acquiring a master information block MIB during initial downlink synchronization; activating the uplink channel/signal space association relation of the candidate target cell configured in the service cell; a receiving beam of a target SSB or a channel state information reference signal CSI-RS, which is an SSB or CSI-RS included in a path loss PL reference signal RS of an uplink channel/signal of a candidate target cell; and receiving a wave beam of a Physical Downlink Control Channel (PDCCH), wherein the PDCCH is used for bearing Downlink Control Information (DCI) triggering an aperiodic uplink channel/signal.

Optionally, the transceiver is further configured to receive third information, where the third information is used to indicate individual closed loop power control, and/or the third information is used to indicate that, according to a TPC command field for transmitting power control, a corresponding parameter value in a power calculation formula is adjusted, and the third information carries a candidate target cell index; the processor determines target sending power according to the third information and the power calculation formula; the transceiver is further configured to transmit an uplink channel/signal for measurement to at least one candidate target base station with the target transmit power.

In a third aspect, there is provided a base station comprising: memory, transceiver, processor; wherein the memory is used for storing a computer program; the processor is used for measuring an uplink channel/signal to obtain a first measurement result, and the transceiver is used for obtaining a second measurement result obtained by at least one candidate target base station for measuring the uplink channel/signal; the processor is further configured to determine a target cell according to the first measurement result and the second measurement result, and the transceiver is configured to send a cell handover command according to information of the target cell.

Optionally, the processor is further configured to determine a target cell according to the first measurement result, the second measurement result, and a target cell decision criterion; the target cell decision criteria include: if the second measurement result is larger than the first measurement result, and the first measurement result is larger than a switching threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell; or if the second measurement result is greater than the first measurement result, the first measurement result is greater than a switching threshold, and the transmission power of the uplink channel/signal sent by the terminal is less than or equal to a power threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell.

Optionally, the processor is further configured to obtain the number of times that the handover condition is satisfied; and under the condition that the number of times meeting the switching condition is larger than or equal to a number threshold, determining a target cell according to the first measurement result, the second measurement result and a preset switching criterion.

Optionally, the transceiver is further configured to send first information, where the first information is used to configure uplink channels/signals used for measurement in the candidate target cell, and the first information includes an association relationship between a resource set of the uplink channels/signals and an index of the candidate target cell;

Or alternatively

The transceiver is further configured to send second information, where the second information is used to indicate a target time-frequency resource of the triggered aperiodic uplink channel/signal; the second information includes indication information, where the indication information is used to indicate an aperiodic uplink channel/signal resource triggering parameter, where the aperiodic uplink channel/signal resource triggering parameter corresponds to a time-frequency resource set of an uplink channel/signal, and the time-frequency resource set of the uplink channel/signal is associated with a candidate target cell index; or the second information carries the index of the candidate target cell; or the second information comprises indexes of candidate target cells and non-periodic uplink channel/signal resource triggering parameters, wherein the non-periodic uplink channel/signal resource triggering parameters are associated with a time-frequency resource set of an uplink channel/signal;

Or alternatively

The transceiver is further configured to send third information, where the third information is used to instruct individual closed-loop power control and/or instruct adjustment of a parameter value corresponding to a power calculation formula according to a TPC command field, and the third information carries a candidate target cell index;

Or alternatively

The transceiver is further configured to send fourth information, where the fourth information is used to indicate a correspondence between a target transmission beam and a target reception beam, and the target transmission beam is used to send an uplink channel/signal for measurement to at least one candidate target base station; wherein the target receive beam comprises at least one of: a receiving beam of a target SSB, where the target SSB is configured to acquire MIB at initial downlink synchronization; activating the uplink channel/signal space association relation of the candidate target cell configured in the service cell; a reception beam of a target SSB or CSI-RS, which is an SSB or CSI-RS included in a PL RS of an uplink channel/signal of a candidate target cell; and receiving a beam of a PDCCH, wherein the PDCCH is used for bearing DCI triggering an aperiodic uplink channel/signal.

In a fourth aspect, there is provided a processor readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to the first or second aspect.

In the embodiment of the application, the uplink channel/signal measurement is adopted to determine the switching target cell, so that the time delay caused by the switching process is reduced, and meanwhile, the terminal does not need to report the measurement result to the source base station in the process of determining the switching target cell by the source base station, thereby greatly reducing the air interface expenditure.

Drawings

FIG. 1 is a schematic diagram of a mobile measurement model;

fig. 2 is one of flowcharts of a cell handover method provided in the present embodiment;

Fig. 3 is a second flowchart of a cell handover method according to the present embodiment;

fig. 4 is a third flowchart of the cell switching method provided in the present embodiment;

Fig. 5 is a schematic diagram of cell handover provided in the present embodiment;

fig. 6 is a schematic diagram of a cell switching apparatus according to the present embodiment;

fig. 7 is a second schematic diagram of the cell switching apparatus according to the present embodiment;

Fig. 8 is a schematic diagram of a terminal provided in the present embodiment;

fig. 9 is a schematic diagram of a base station provided in this embodiment.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

In order to facilitate understanding of the technical scheme of the present application, the following technical points are introduced:

1. Regarding mobility measurements.

The current mobility measurement is based on the terminal measuring the downlink reference signals of each adjacent cell and reporting the measurement results, and then the base station determines the target handover cell according to the measurement results. The beam measurement reporting process in the current mobility measurement is as follows:

Step 1: the base station configures the terminal for measurement through radio resource control (Radio Resource Control, RRC), and the configured parameters include:

a. The measurement object (Measurement Object, MO) provides the terminal with reference signal Information to be measured, and the reference signal that can be measured is a synchronization signal block (Synchronization Signal Block, SSB) or/and a single-port periodic channel state Information reference signal (CHANNEL STATE Information REFERENCE SIGNAL, CSI-RS).

B. The reporting configuration (Reporting configuration) indicates which measurement (reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP), reference signal received Power (REFERENCE SIGNAL RECEIVED Quality, RSRP) or signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR)) the terminal needs to measure and report.

C. The measurement quantity configuration (quantityConfig) indicates the Layer3 (Layer 3, L3) filter coefficients that filter the measurement. In one measurement configuration (measconfig), a maximum of 2 quantityConfig are included.

Step 2: and after receiving the measurement configuration, the terminal performs measurement according to the measurement configuration to obtain a measurement result. A measurement model for obtaining cell level measurements and beam level measurements is shown in fig. 1.

At point a, the terminal measures the beam of a certain cell for the resources configured by the base station in the measurement object and obtains measurement results beam1, beam2, …, beam K. At the point A1, the terminal performs layer 1 filtering on the measurement result obtained at the point a, and then the terminal compares the measurement value after layer 1 filtering with a certain threshold configured by the base station to obtain a cell-level measurement result (point B). If the RRC configures a Threshold (Threshold) for beam selection, the maximum beam N that is taken when the cell-level measurement is obtained, and N (N < N) beams of beams detected by the UE have a quality not lower than the configured Threshold, the cell-level measurement is equal to a linear average of the measurements corresponding to the N best beams that are greater than Threshold. If the best beam quality in the beams detected by the UE is lower than the configured Threshold, the cell-level measurement result is equal to the measurement result corresponding to the best beam in the beams detected by the UE.

After point B, the terminal performs L3 filtering on the cell-level measurement result to obtain the signal quality (point C) of each cell. The terminal compares the cell-level measurement result with the conditions in the reporting criteria, and if the reporting criteria (such as Event A3: neighbor cell measurement result is better than a special cell (such as primary serving cell (PRIMARY CELL, PCell)/primary secondary cell (PRIMARY SCG CELL, PSCELL) by a certain offset (offset)) is satisfied, the terminal performs cell-level measurement reporting.

Meanwhile, if the terminal is configured to report the measurement result of the beam level (reportConfig includes that the beam measurement (IncludeBeamMeasurements) is true), the terminal needs to report the measurement result of the beam level. As in the lower part of fig. 1, after L3 filtering (point E) the K beam measurements in a certain cell, the terminal selects X beams of which the number is greater than the pre-configured threshold (absThreshSS-BlocksConsolidation), reports its index (SSB resource indication/CSI-RS resource indication) and the corresponding beam quality (RSRP/RSRQ/SINR) (point F in fig. 1).

Step 3: when the terminal reports the measurement result in an event-driven mode, the terminal judges whether an event-driven condition is met according to the measurement result, the event-driven condition is configured to the terminal by the base station, and when the terminal detects that the measurement result meets the event-driven condition, for example, the RSRP value of a cell level is larger than a certain threshold for a period of time (TimeToTrigger), the terminal reports the measurement result. When reporting the measurement result, the terminal sends a scheduling request (Scheduling Request, SR) to request Uplink resources, and the base station sends Uplink scheduling (UL grant) to allocate Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH) resources after receiving the Uplink scheduling request. And the terminal transmits the beam measurement result on the PUSCH resource indicated by the UL grant through the base station.

Referring to fig. 2, an embodiment of the present application provides a cell handover method, which is applied to a terminal, and specifically includes the steps of: step 201, step 202 and step 203.

Step 201: the terminal respectively transmits an uplink channel/signal for measurement to the source base station and at least one candidate target base station;

Optionally, the uplink channel/signal may include, but is not limited to, at least one of a Sounding reference signal (Sounding REFERENCE SIGNAL, SRS), a preamble (preamble), etc.

Step 202: the terminal receives a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell;

Step 203: and the terminal is switched to the target cell according to the cell switching command, and the target cell is determined based on the uplink channel/signal measurement.

Optionally, the target cell indicated in the cell handover command is determined by the source base station according to a first measurement result and a second measurement result, where the first measurement result is obtained by the source base station measuring the uplink channel/signal, and the second measurement result is obtained by the at least one candidate target base station measuring the uplink channel/signal.

In one embodiment of the application, the method further comprises:

For example, the first information includes an association of an SRS resource set (SRS-resource) with an additional (additional) physical cell identity (PHYSICAL CELL IDENTIFIER, PCI).

In one embodiment of the present application, the terminal transmits an uplink channel/signal for measurement to at least one candidate target base station, including:

In one embodiment of the application, the method further comprises:

The second information includes indication information (such as srs_request field) for indicating an aperiodic uplink channel/signal resource triggering (aperiodicSRS-ResourceTrigger) parameter, where the aperiodic uplink channel/signal resource triggering parameter corresponds to a time-frequency resource set of an uplink channel/signal, and the time-frequency resource set of the uplink channel/signal is associated with a candidate target cell index (such as an additional PCI);

Or the second information carries the index of the candidate target cell;

(1) A receive beam of a target synchronization signal block (Synchronization Signal Block, SSB) for acquiring a master information block (Master Information Block, MIB) upon initial downlink synchronization;

(2) Activating the uplink channel/signal space association relation of the candidate target cell configured in the service cell;

(3) A reception beam of a target SSB or a channel state Information reference signal (CHANNEL STATE Information REFERENCE SIGNAL, CSI-RS), which is an SSB or a CSI-RS included in a Path Loss (PL) RS of an uplink channel/signal of a candidate target cell;

(4) A received beam of a physical downlink control channel (Physical downlink control channel, PDCCH) carrying downlink control information (Downlink Control Information, DCI) triggering an aperiodic uplink channel/signal.

In one embodiment of the present application, the correspondence between the target transmit beam and the target receive beam is determined by a protocol convention, a network side configuration, or the terminal.

the terminal receives third information, wherein the third information is used for indicating independent closed-loop power control and/or indicating adjustment of a corresponding parameter value in a power calculation formula according to a transmitting power control (Transmit Power Control, TPC) command domain, and the third information carries candidate target cell indexes;

Optionally, the third information includes a power offset (delta_power_offset) associated with SRS closed loop power control. The power offset may be base station configured to the terminal.

Optionally, the power calculation formula is:

wherein delta_power_offset is indicated to the terminal by the base station;

i: representing PUSCH or PUCCH or SRS or PRACH transmission occasions;

q _d: an index of a reference signal for downlink Pathloss estimation, the reference signal may be SSB or CSI-RS;

l represents an SRS power control adjustment state (power control adjustment state);

b, f, c: b corresponds to UL BWP index, f corresponds to carrier index, c is corresponding serving cell index;

Mu: SCS of PUCCH or PUSCH;

p _CMAX,f,c (i) is the maximum output power configured for the serving cell c or the carrier f at the PUSCH transmission occasion i, and corresponds to a carrier level power parameter, which refers to the maximum output power of each time slot on the carrier f of each serving cell c;

: open loop power control parameters;

α _SRS,b,f,c(q_s) is provided by the activation UL BWP b of carrier f of serving cell c and by the alpha in SRS resource set q _s;

M _SRS,b,f,c (i): specifying the SRS bandwidth RB number at the moment;

PL _b,fc(q_d) =reference signal power-measured and higher layer filtered RSRP.

In the embodiment of the application, the time delay brought by the switching process is reduced by adopting the uplink channel/signal measurement to determine the switching target cell. Meanwhile, in the process that the source base station determines the target cell for switching, the terminal does not need to report the measurement result to the source base station, so that the air interface overhead is greatly reduced.

Referring to fig. 3, an embodiment of the present application provides a cell handover method, which is applied to a source base station, and specifically includes the steps of: step 301, step 302, step 303 and step 304.

Step 301: the source base station measures an uplink channel/signal to obtain a first measurement result;

Step 302: the source base station obtains a second measurement result obtained by measuring the uplink channel/signal by at least one candidate target base station;

It will be appreciated that step 301 may precede step 302, or step 302 may precede step 301, or step 301 and step 302 may be performed simultaneously.

Step 303: the source base station determines a target cell according to the first measurement result and the second measurement result;

Step 304: and the source base station sends a cell switching command according to the information of the target cell.

In one embodiment of the present application, the determining, by the source base station, a target cell according to the first measurement result and the second measurement result includes:

The target cell decision criteria include:

Or alternatively

In one embodiment of the present application, the determining, by the source base station, the target cell according to the first measurement result, the second measurement result and a preset handover criterion includes:

acquiring the times of meeting the switching conditions;

In one embodiment of the application, the method further comprises:

Or the second information carries the index of the candidate target cell;

In one embodiment of the application, the method further comprises:

Alternatively, the power calculation formula is as follows:

In one embodiment of the application, the method further comprises:

Wherein the target receive beam comprises at least one of:

(1) A receiving beam of a target SSB, where the target SSB is configured to acquire MIB at initial downlink synchronization;

(3) A reception beam of a target SSB or CSI-RS, which is an SSB or CSI-RS included in a PL RS of an uplink channel/signal of a candidate target cell;

(4) And receiving a beam of a PDCCH, wherein the PDCCH is used for bearing DCI triggering an aperiodic uplink channel/signal.

Referring to fig. 4, the specific steps are as follows:

Step 1: the source base station configures uplink channels/signals (such as SRS, preamble) etc. for measurement in the terminal candidate target cell, such as associating SRS-resource set with the additional PCI.

Step 2: the terminal transmits an uplink channel/signal to the source base station and at least one candidate target base station.

Optionally, the target time-frequency resource of the terminal for sending the uplink channel/signal to the candidate target cell includes:

(1) Time-frequency resources reserved for all candidate target cells;

For all candidate target cells, a specific time-frequency resource is reserved, and the terminal polls and transmits uplink channels/signals on the candidate target cells, for example, the uplink channels/signals are alternately transmitted on the specific resource according to the PCI%2 method, the specific time-frequency resource is known to other cells, and the specific resource can be configured to the terminal through a network side.

(2) And the time-frequency resource of the candidate target cell configured by the network side.

The network side configures the cell in which the terminal needs to send the uplink channel/signal and the corresponding time-frequency resource, for example, the base station judges the movement of the terminal according to the previous measurement result (for example, the measurement result of some candidate target cells is greater than a threshold), so that the terminal only sends the uplink channel/signal to the target cell which is more likely to be switched, thereby further reducing the sending time-frequency resource.

Alternatively, for periodic and semi-persistent uplink channels/signals, the period (periodicity) and offset (offset) are configured (SRS-Resource) to the terminal by radio Resource control (Radio Resource Control, RRC).

Optionally, for aperiodic uplink channel/signal triggering (trigger), 1 aperiodic SRS resource triggering (aperiodicSRS-ResourceTrigger) is indicated through srs_request field (e.g., 2 bits) in DCI 0_1, corresponding to one SRS resource set.

If the uplink channel/signal of the neighboring cell is to be triggered, this can be achieved by:

1) Associating the SRS-resource set with the candidate target cell index, for example, configuring an additional PCI in the SRS-resource set, and then implementing by a conventional manner of triggering an aperiodic uplink channel/signal, that is, using the SRS request (request) field in DCI format 0_1 to indicate 1 aperiodicSRS-ResourceTrigger, which corresponds to one SRS resource set.

2) The additional PCI is added to the DCI (e.g., DCI format 0_1) of the legacy trigger aperiodic uplink channel/signal.

3) Triggering is performed in a new manner, for example, by introducing a new MAC CE, in which the additional PCI and aperiodicSRS-ResourceTrigger/SRS-resource set are included.

Alternatively, the specific correspondence of AperiodicSRS-ResourceTrigger to SRS-resource set may be accomplished through RRC configuration. Such as AperiodicSRS-ResourceTrigger1 triggering SRS resource set #3 on PCI #1, aperiodic SRS-ResourceTrigger2 triggering SRS resource set #1 on PCI #2, SRS resource set #2 on PCI #3, etc.

Optionally, for the target transmission beam used by the terminal for transmitting the uplink channel/signal in the candidate target cell, the following transmission beam corresponding to the reception beam may be used:

(2) Activating an uplink channel/signal space association relation (SRS-SpatialRelationInfo) of a candidate target cell configured in a serving cell;

For example, consider the activation of SRS of version 15/16 (Rel-15/16), in a manner similar to that described in 3) above; in the case of unified (unified) transport configuration indication (Transmission Configuration Indication, TCI) architecture, the manner of activating SRS uses the manner of activating unified TCI state when configuring SRS to follow (low) unified TCI state (state). If the configured SRS does not follow unified TCI, the manner of SRS activation in Rel-15/16 is used.

Optionally, the target power at which the terminal transmits the uplink channel/signal to each candidate target cell is determined by:

(1) The setting of the SRS power control adjustment state (SRS-PowerControlAdjustmentStates) to a separate closed loop (separateClosedLoop) indicates that the terminal power control is adjusted to a power control adjustment mode (considering that there is no PUSCH transmission at this time) independent of the Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH) in the same Bandwidth Part (BWP).

(2) And adjusting a corresponding parameter value in a power calculation formula by using a transmitting power control (Transmit Power Control, TPC) command field in the traditional DCI, wherein the DCI carries the additional PCI information.

Optionally, the power calculation formula is as follows:

Wherein,

The open loop power control parameter P ₀, alpha is configured to the terminal in advance through the high-layer signaling. The PL-RS may be CSI-RS/SSB configured by higher layer signaling (PathlossReferenceRS-Config), and may be Demodulation reference signal (Demodulation REFERENCE SIGNAL, DM-RS) of primary synchronization signal (Primary Synchronisation Signal, PSS)/secondary synchronization signal (Secondary Synchronisation Signal, SSS) or physical broadcast channel (Physical broadcast channel, PBCH).

Step 3a: the source base station receives an uplink channel/signal sent by a terminal on a corresponding time-frequency resource and measures to obtain a first measurement result;

step 3b: and the at least one candidate target base station receives the uplink channel/signal sent by the terminal on the corresponding time-frequency resource, measures and obtains a second measurement result, and sends the second measurement result to the source base station.

Step4: and the source base station determines the target cell according to the first measurement result, the second measurement result and the target cell judgment criterion.

Optionally, the target cell decision criteria include:

(1) RSRP of uplink channel/signal (a scenario where transmission power of uplink channel/signal for candidate target cell is equal): such as SRS-RSRPi-SRS-RSRP1> handoff offset (handoff_offset), then the handoff to the i candidate target cell is made. Wherein the handover_offset is configured to the terminal through the base station, SRS-RSRP1 represents a first measurement result corresponding to the source cell, and SRS-RSRPi represents a second measurement result corresponding to the i candidate target cell.

Optionally, the switching condition includes:

a. the RSRP value of the uplink channel/signal of the serving cell is smaller than a certain absolute threshold.

B. the RSRP value of the uplink channel/signal of the candidate target cell is above a certain absolute threshold.

C. The RSRP value of the uplink channel/signal of the candidate target cell is higher than a certain threshold value of the serving cell (the primary serving cell (PRIMARY CELL, pcell)).

D. The RSRP value of the uplink channel/signal of the candidate target Cell is higher than a certain threshold value of a serving Cell (Scell).

(2) The RSRP of the uplink channel/signal and the transmission power of the uplink channel/signal (for the scenario where the transmission powers of SRS of candidate target cells are not equal),

The switching condition in criterion (2) is similar to the switching condition a/b/c/d in criterion (1).

To avoid ping-pong (pingpang) handovers, a frequency threshold (SRS-RSRP-EvalTime) may be defined, and the target cell for the handover is determined when the detected number of times that satisfies the criteria for the handover reaches and exceeds a certain frequency threshold. For example, in a scene with large signal fluctuation, the number of times of decision can be increased by increasing the threshold value of the number of times to avoid ping-pong switching. The parameter value can be reduced in a scene of fast signal attenuation to reduce the decision times so as to ensure the timeliness of switching.

Step 5: and the source base station issues a cell switching command according to the information of the target cell.

Embodiments of the present application are described below in conjunction with fig. 4, 5, and examples 1 and 2.

Example 1: the base station transmits periodic SRS for measurement of cell handover.

Step 1: the SRS used for measurement by the terminal in the serving cell configuration candidate target cell (pci#3) is SRS resource#3 in SRS resource set#1.

And 2, the terminal transmits the periodic SRS#3 to the candidate target cell#3 according to the configuration of the base station.

The time domain period and offset of the periodic SRS are transmitted, and the starting position of an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol in the time domain and the frequency domain resources are configured to the terminal through RRC.

Step 3, the sending beam used by the terminal for sending SRS to the candidate target cell #3 can be determined by at least one of the following receiving beams:

The receive beam of SSB used to successfully read MIB at initial downlink synchronization.

Activate SRS-SpatialRelationInfo configured in candidate target cell # 3.

Receive beam of SSB/CSI-RS included in PL RS of SRS.

The reception beam of the PDCCH carrying DCI of the trigger aperiodic SRS.

Step 4: the transmission power of the terminal for transmitting SRS to the candidate target cell #3 is calculated according to the following power calculation formula:

Wherein, the open loop power control parameter P ₀, alpha is configured to the terminal in advance through higher layer signaling (such as RRC).

The PL-RS can be configured by a CSI-RS/SSB of a high layer signaling (PathlossReferenceRS-Config) or the DM-RS of the PSS/SSS or the PBCH.

The closed loop power control adjustment includes:

Setting separateClosedLoop by means of parameters srs-PowerControlAdjustmentStates indicates that the terminal power control is adjusted to a power control adjustment mode independent of PUSCH in the same BWP (considering that there is no PUSCH transmission at this time).

And adjusting the corresponding parameter value by using a TPC command field in the traditional DCI, wherein the DCI carries the additional PCI information.

Alternatively, the transmission power of the SRS is determined in the following manner.

A) And directly using the SRS transmission power of the serving cell to obtain the SRS transmission power P _{SRS,candidate_cell} of the candidate target cell.

B) And adjusting the sending power of the SRS of the serving cell to obtain P _{SRS,candidate_cell}.

I. Delta_power_offset is included in the SRS closed loop power control h _b,f,c (i, l) term.

The independent delta_power_offset is introduced, and the formula for determining the SRS transmission power at this time is as follows:

Wherein the value of delta_power_offset is indicated to the terminal by the base station.

Step 5: the base stations of the serving cell and the candidate target cell receive the SRS sent by the terminal on the corresponding time-frequency resources and estimate the SRS-RSRP, and the candidate target cell #3 sends the measured SRS-RSRP value to the serving cell. Serving cell SRS-rsrp=12 dB, SRS-rsrp=18 dB of candidate target cell # 3.

Step 6: the serving cell receives the SRS-RSRP value measured by the candidate target cell and finds that the SRS-RSRP value of the candidate target cell 3 is 6dB higher than the SRS-RSRP value of the serving cell and is 3dB higher than the previous threshold value, and the serving cell decides to switch the terminal to the target cell 3.

Step 7: the serving cell issues a cell handover command informing the terminal to handover to the target cell 3.

Example 2: the base station transmits aperiodic SRS for measurement of cell handover.

And 2, the terminal transmits the aperiodic SRS#3 to the candidate target cell#3 according to the configuration of the base station.

The base station issues DCI format0_1, 1 number aperiodicSRS-ResourceTrigger of the DCI format is indicated by the srs_request field (00) therein, the corresponding SRS resource set is 1, and the aperiodic SRS resource set 1 in PCI #3 is activated in this way. Optionally, the base station includes an additional pci=3 in DCI format0_1, thereby triggering transmission of SRS resource set #1 in the target cell # 3. The time-frequency resources for transmitting the aperiodic SRS are also configured to the terminal through RRC.

Step 3 the determination of the beam and transmit power used by the terminal to transmit SRS for candidate target cell #3 is similar to step 3 in embodiment 1.

Step 4: the base stations of the serving cell and the candidate target cell receive the SRS sent by the terminal on the corresponding time-frequency resources and estimate the SRS-RSRP, and the candidate target cell #3 sends the measured SRS-RSRP value to the serving cell. Serving cell SRS-rsrp=12 dB, SRS-rsrp=18 dB of candidate target cell # 3.

Step 5: the serving cell receives the SRS-RSRP value measured by the candidate target cell and finds that the SRS-RSRP value of the candidate target cell 3 is 6dB higher than the SRS-RSRP value of the serving cell and is 3dB higher than the previous threshold value, and the serving cell decides to switch the terminal to the target cell 3.

Step 6: the serving cell issues a cell handover command informing the terminal to handover to the target cell 3.

The prior cell switching is completed by the terminal measuring the downlink reference signals of each adjacent cell according to the configuration of the base station and reporting the measurement results, and the base station determines the target switching cell according to the measurement results. In the process, the terminal needs to measure the reference signals of each candidate target cell and report the reference signals to the base station, the measurement time delay is large, the complexity of the terminal is high, and the terminal needs to report all measurement results, so that the air interface overhead is large. In the embodiment, the uplink channel/signal measurement is adopted to determine the switching target cell, so that the time delay brought by the switching process is reduced. Meanwhile, the terminal does not need to report the measurement result, and the air interface overhead is greatly reduced.

Referring to fig. 6, an embodiment of the present application provides a cell switching apparatus, which is applied to a terminal, and the apparatus 600 includes:

a first transmitting module 601, configured to transmit uplink channels/signals for measurement to a source base station and at least one candidate target base station, respectively;

alternatively, the uplink channel/signal may include, but is not limited to, at least one of a sounding reference signal, a preamble, etc.

A first receiving module 602, configured to receive a cell handover command sent by the source base station, where the cell handover command carries information of a target cell;

A switching module 603, configured to switch to the target cell according to the cell switching command;

In one embodiment of the application, the apparatus further comprises:

and the second receiving module is used for receiving first information, the first information is used for configuring the uplink channel/signal used for measurement in the candidate target cell, and the first information comprises the association relation between the resource set of the uplink channel/signal and the index of the candidate target cell.

For example, the first information includes an association relationship between the SRS resource set and the additional PCI.

In one embodiment of the present application, the first transmitting module 601 is further configured to: transmitting an uplink channel/signal for measurement to at least one candidate target base station through a target time-frequency resource; the target time-frequency resource is a reserved time-frequency resource or a time-frequency resource of a candidate target cell configured by a network side.

In one embodiment of the application, the apparatus further comprises:

A third receiving module, configured to receive second information, where the second information is used to indicate a target time-frequency resource of a triggered aperiodic uplink channel/signal;

Or the second information carries the index of the candidate target cell;

In one embodiment of the present application, the first transmitting module 601 is further configured to: transmitting an uplink channel/signal for measurement to at least one candidate target base station through a target transmission beam;

In one embodiment of the present application, the first transmitting module 601 includes:

A first receiving unit, configured to receive third information, where the third information is used to indicate individual closed-loop power control and/or indicate to adjust a parameter value corresponding to a power calculation formula according to a TPC command field, and the third information carries a candidate target cell index;

a determining unit, configured to determine a target transmission power according to the third information and the power calculation formula;

And the first transmitting unit is used for transmitting the uplink channel/signal for measurement to at least one candidate target base station through the target transmitting power.

In the embodiment of the present application, the device can implement each process implemented in the embodiment of the method shown in fig. 2 of the present application and achieve the same beneficial effects, and in order to avoid repetition, the description is omitted here.

Referring to fig. 7, an embodiment of the present application provides a cell switching apparatus, applied to a source base station, where an apparatus 700 includes:

A first measurement module 701, configured to obtain a first measurement result for uplink channel/signal measurement;

alternatively, the uplink channel/signal may include, but is not limited to, at least one of SRS, preamble, etc.

A first obtaining module 702, configured to obtain a second measurement result obtained by at least one candidate target base station for uplink channel/signal measurement;

a first determining module 703, configured to determine a target cell according to the first measurement result and the second measurement result;

and a second sending module 704, configured to send a cell handover command according to the information of the target cell.

In one embodiment of the present application, the first determining module 703 is further configured to:

Determining a target cell according to the first measurement result, the second measurement result and a target cell judgment criterion;

The target cell decision criteria include:

Or alternatively

In one embodiment of the present application, the first determining module 703 is further configured to: acquiring the times of meeting the switching conditions; and under the condition that the number of times meeting the switching condition is larger than or equal to a number threshold, the source base station determines a target cell according to the first measurement result, the second measurement result and a preset switching criterion.

In one embodiment of the application, the apparatus further comprises:

and the third sending module is used for sending first information, wherein the first information is used for configuring uplink channels/signals used for measurement in the candidate target cell, and the first information comprises the association relation between a resource set of the uplink channels/signals and the index of the candidate target cell.

In one embodiment of the application, the apparatus further comprises:

A fourth transmitting module, configured to transmit second information, where the second information is used to indicate a target time-frequency resource of a triggered aperiodic uplink channel/signal;

Or the second information carries the index of the candidate target cell;

In one embodiment of the application, the apparatus further comprises:

and a fifth sending module, configured to send third information, where the third information is used to indicate individual closed-loop power control and/or indicate to adjust a parameter value corresponding to the power calculation formula according to the TPC command field, and the third information carries a candidate target cell index.

In one embodiment of the application, the apparatus further comprises:

A sixth transmitting module, configured to transmit fourth information, where the fourth information is used to indicate a correspondence between a target transmitting beam and a target receiving beam, and the target transmitting beam is used to transmit an uplink channel/signal for measurement to at least one candidate target base station;

Wherein the target receive beam comprises at least one of:

In the embodiment of the present application, the device can implement each process implemented in the embodiment of the method shown in fig. 3 of the present application and achieve the same beneficial effects, and in order to avoid repetition, the description is omitted here.

It should be noted that, the above device provided in this embodiment of the present invention can implement all the method steps implemented in the method embodiment applied to the communication device, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.

It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional units.

The integrated modules, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

As shown in fig. 8, an embodiment of the present invention further provides a terminal, including: memory 820, transceiver 800, processor 810; wherein the memory 820 is used for storing a computer program; a processor 810 for reading the computer program in the memory. The transceiver 800 is configured to transmit uplink channels/signals for measurement to the source base station and at least one candidate target base station, respectively; receiving a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell; the processor 810 is configured to switch to the target cell based on the uplink channel/signal measurement according to the cell switch command.

Optionally, the transceiver 800 is further configured to receive first information, where the first information is used to configure uplink channels/signals used for measurement in the candidate target cell, and the first information includes an association relationship between a resource set of the uplink channels/signals and an index of the candidate target cell.

For example, the first information includes an association relationship between the SRS-resource set and the additional PCI.

Optionally, the transceiver 800 is further configured to send an uplink channel/signal for measurement to at least one candidate target base station through the target time-frequency resource; the target time-frequency resource is a time-frequency resource reserved for all candidate target cells or a time-frequency resource of the candidate target cells configured by a network side.

Optionally, the transceiver 800 is further configured to receive second information, where the second information is used to indicate time-frequency resources reserved for all candidate target cells and used for transmitting the uplink channel/signal, or the second information is used to indicate time-frequency resources of candidate target cells configured on the network side.

Or the second information carries the index of the candidate target cell;

Optionally, the transceiver 800 is further configured to transmit uplink channels/signals for measurement to at least one candidate target base station via a target transmit beam;

Optionally, the transceiver 800 is further configured to receive third information, where the third information is used to indicate individual closed loop power control, and/or the third information is used to indicate that a corresponding parameter value in the power calculation formula is adjusted according to the TPC command field, and the third information carries a candidate target cell index;

the processor 810 is configured to determine a target transmission power according to the third information and the power calculation formula;

transceiver 800 is also configured to transmit an uplink channel/signal for measurement to at least one candidate target base station with the target transmit power.

Wherein in fig. 8, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 810 and various circuits of memory represented by memory 820, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 800 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 810 in performing operations.

The processor 810 may be a Central Processing Unit (CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), or may employ a multi-core architecture.

As shown in fig. 9, an embodiment of the present invention further provides a base station, including: memory 920, transceiver 900, processor 910; wherein the memory 920 is used for storing a computer program; a processor 910 for reading the computer program in the memory.

Optionally, the processor 910 is configured to obtain a first measurement result for uplink channel/signal measurement; the transceiver 900 is configured to obtain a second measurement result obtained by measuring the uplink channel/signal by at least one candidate target base station; the processor 910 is further configured to determine a target cell according to the first measurement result and the second measurement result; the transceiver 900 is further configured to send a cell handover command according to the information of the target cell.

Optionally, the processor 910 is configured to determine a target cell according to the first measurement result, the second measurement result, and a target cell decision criterion; the target cell decision criteria include: if the second measurement result is larger than the first measurement result, and the first measurement result is larger than a switching threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell; or if the second measurement result is greater than the first measurement result, the first measurement result is greater than a switching threshold, and the transmission power of the uplink channel/signal sent by the terminal is less than or equal to a power threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell.

Optionally, the transceiver 900 is further configured to send first information, where the first information is used to configure uplink channels/signals used for measurement in the candidate target cell, and the first information includes an association relationship between a resource set of the uplink channels/signals and an index of the candidate target cell.

Optionally, the transceiver 900 is further configured to send second information, where the second information is used to indicate time-frequency resources reserved for all candidate target cells and used to send the uplink channel/signal, or the second information is used to indicate time-frequency resources of the candidate target cells configured on the network side.

Optionally, the transceiver 900 is further configured to send third information, where the third information is used to indicate individual closed loop power control and/or indicate that the corresponding parameter value in the power calculation formula is adjusted according to the TPC command field, and the third information carries the candidate target cell index.

Optionally, the transceiver 900 is further configured to send fourth information, where the fourth information is used to indicate a correspondence between a target transmission beam and a target reception beam, where the target transmission beam is used to send an uplink channel/signal for measurement to at least one candidate target base station;

Wherein the target receive beam comprises at least one of:

Wherein in fig. 9, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 910 and various circuits of memory represented by memory 920, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 900 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 910 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 910 in performing operations.

The processor 910 may be a Central Processing Unit (CPU), an Application SPECIFIC INTEGRATED Circuit (ASIC), a Field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or a complex Programmable logic device (Complex Programmable Logic Device, CPLD), or the processor may employ a multi-core architecture.

It should be noted that, the above communication device provided by the embodiment of the present invention can implement all the method steps implemented by the method embodiment applied to the communication device, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in the embodiment are omitted herein.

In addition, the embodiment of the present invention further provides a processor readable storage medium, on which a computer program is stored, where the program when executed by a processor implements the steps of the communication processing method described above, and the same technical effects can be achieved, and for avoiding repetition, a detailed description is omitted herein. The readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), etc.

It should be noted that the technical solution provided by the embodiment of the present application may be applicable to various systems, especially a 5G system. For example, applicable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (GENERAL PACKET Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR) systems, and the like. Terminal devices and network devices are included in these various systems. Core network parts may also be included in the system, such as Evolved packet system (Evolved PACKET SYSTEM, EPS), 5G system (5 GS), etc.

The terminal device according to the embodiment of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as Personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal DIGITAL ASSISTANT, PDA) and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (ACCESS TERMINAL), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present application are not limited.

The base station according to the embodiment of the application can comprise a plurality of cells for providing services for the terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be configured to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the base station according to the embodiment of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, a base station may include a centralized unit (centralized unit, CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions, which may be Single-User MIMO (SU-MIMO) or Multiple-User MIMO (MU-MIMO), may each be performed between a base station and a terminal using one or more antennas. The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method for cell handover, comprising:

2. The method according to claim 1, wherein the method further comprises:

3. The method according to claim 1, wherein the terminal transmits the uplink channel/signal for measurement to at least one candidate target base station, comprising:

4. A method according to claim 3, characterized in that the method further comprises:

Or the second information carries the index of the candidate target cell;

5. The method according to claim 1, wherein the terminal transmits the uplink channel/signal for measurement to at least one candidate target base station, comprising:

6. The method according to claim 1, wherein the terminal transmits the uplink channel/signal for measurement to at least one candidate target base station, comprising:

7. The method of claim 6, wherein the third information comprises a power offset associated with SRS closed loop power control.

8. A method for cell handover, comprising:

9. The method of claim 8, wherein the source base station determining a target cell from the first measurement result and the second measurement result comprises:

The target cell decision criteria include:

Or alternatively

10. The method of claim 9, wherein the source base station determining a target cell according to the first measurement result, the second measurement result, and a preset handover criterion comprises:

acquiring the times of meeting the switching conditions;

11. The method of claim 8, wherein the method further comprises:

12. The method of claim 8, wherein the method further comprises:

Or the second information carries the index of the candidate target cell;

13. The method of claim 8, wherein the method further comprises:

14. The method of claim 13, wherein the third information comprises a power offset associated with SRS closed loop power control.

15. The method of claim 8, wherein the method further comprises:

Wherein the target receive beam comprises at least one of:

16. A cell switching apparatus, applied to a terminal, comprising:

17. A cell switching apparatus applied to a source base station, comprising:

18. A terminal, comprising: memory, transceiver, processor; wherein the memory is used for storing a computer program; the transceiver is used for respectively transmitting uplink channels/signals for measurement to the source base station and at least one candidate target base station; receiving a cell switching command sent by the source base station, wherein the cell switching command carries information of a target cell; the processor is configured to switch to the target cell based on the cell switch command, the target cell being determined based on the uplink channel/signal measurements.

19. The terminal of claim 18, wherein the transceiver is further configured to receive first information, the first information being used to configure uplink channels/signals for measurement in the candidate target cell, the first information including an association of a set of resources of the uplink channels/signals with a candidate target cell index.

20. The terminal of claim 18, wherein the transceiver is further configured to transmit an uplink channel/signal for measurement to at least one candidate target base station over a target time-frequency resource; the target time-frequency resource is a time-frequency resource reserved for all candidate target cells or a time-frequency resource of the candidate target cells configured by a network side.

21. The terminal of claim 18, wherein the transceiver is further configured to receive second information indicating a target time-frequency resource of the triggered aperiodic uplink channel/signal; the second information includes indication information, where the indication information is used to indicate an aperiodic uplink channel/signal resource triggering parameter, where the aperiodic uplink channel/signal resource triggering parameter corresponds to a time-frequency resource set of an uplink channel/signal, and the time-frequency resource set of the uplink channel/signal is associated with a candidate target cell index; or the second information carries the index of the candidate target cell; or the second information comprises indexes of candidate target cells and non-periodic uplink channel/signal resource triggering parameters, wherein the non-periodic uplink channel/signal resource triggering parameters are associated with a time-frequency resource set of an uplink channel/signal.

22. The terminal of claim 18, wherein the transceiver is further configured to transmit an uplink channel/signal for measurement to at least one candidate target base station via a target transmit beam; wherein the target transmit beam is a transmit beam corresponding to a target receive beam, the target receive beam comprising at least one of: a receiving beam of a target SSB, where the target SSB is configured to acquire MIB at initial downlink synchronization; activating the uplink channel/signal space association relation of the candidate target cell configured in the service cell; a reception beam of a target SSB or CSI-RS, which is an SSB or CSI-RS included in a path loss PL reference signal RS of an uplink channel/signal of a candidate target cell; and receiving a wave beam of a PDCCH, wherein the PDCCH is used for bearing downlink control information DCI triggering an aperiodic uplink channel/signal.

23. The terminal of claim 18, wherein the transceiver is further configured to receive third information, the third information being configured to indicate individual closed loop power control, and/or the third information being configured to indicate adjustment of a corresponding parameter value in a power calculation formula according to a TPC command field, the third information carrying candidate target cell indexes; the processor determines target sending power according to the third information and the power calculation formula; the transceiver is further configured to transmit an uplink channel/signal for measurement to at least one candidate target base station with the target transmit power.

24. A base station, comprising: memory, transceiver, processor; wherein the memory is used for storing a computer program; the processor is used for measuring an uplink channel/signal to obtain a first measurement result, and the transceiver is used for obtaining a second measurement result obtained by at least one candidate target base station for measuring the uplink channel/signal; the processor is further configured to determine a target cell according to the first measurement result and the second measurement result, and the transceiver is configured to send a cell handover command according to information of the target cell.

25. The base station of claim 24, wherein the processor is further configured to determine a target cell based on the first measurement, the second measurement, and a target cell decision criterion; the target cell decision criteria include: if the second measurement result is larger than the first measurement result, and the first measurement result is larger than a switching threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell; or if the second measurement result is greater than the first measurement result, the first measurement result is greater than a switching threshold, and the transmission power of the uplink channel/signal sent by the terminal is less than or equal to a power threshold, selecting a candidate target cell corresponding to the second measurement result as a target cell.

26. The base station of claim 24, wherein the processor is further configured to obtain a number of times a handoff condition is satisfied; and under the condition that the number of times meeting the switching condition is larger than or equal to a number threshold, determining a target cell according to the first measurement result, the second measurement result and a preset switching criterion.

27. The base station of claim 24, wherein the transceiver is further configured to send first information, the first information being used to configure uplink channels/signals for measurement in the candidate target cell, the first information including an association of a set of resources of the uplink channels/signals with a candidate target cell index;

Or alternatively

28. A processor readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method according to any of claims 1 to 15.