CN104202779B - Cell switching method and system in communication system - Google Patents

Cell switching method and system in communication system Download PDF

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CN104202779B
CN104202779B CN201410453912.4A CN201410453912A CN104202779B CN 104202779 B CN104202779 B CN 104202779B CN 201410453912 A CN201410453912 A CN 201410453912A CN 104202779 B CN104202779 B CN 104202779B
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cell
communication terminal
candidate cells
handover candidate
handover
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CN104202779A (en
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刘为
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CETC 7 Research Institute
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CETC 7 Research Institute
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Abstract

The invention discloses the cell switching method in a kind of communication system and system, methods described includes：Communication terminal is received to the random access channel resource of each handover candidate cells；Stochastic accessing synchronizing symbol is sent to each handover candidate cells by the random access channel resource in measurement time slot；Receive switching command；The switching command is responded, the communication terminal is switched to by the Target cell from the serving cell according to the wireless resource scheduling information.Implement the method and system of the present invention, caused business interruption time when can reduce switching serving cell, improve telecommunication service quality and Consumer's Experience.

Description

Cell switching method and system in communication system
Technical field
The present invention relates to communication technical field, more particularly to the cell switching method and system in a kind of communication system.
Background technology
In satellite mobile communication system, ground communication terminal passes through inserting of satellite to GSM.Satellite equipments has Beam forming network, up to a hundred extremely narrow beam projections to earth surface, each wave beams can be formed and correspond to GSM A cell, averagely cover 400~500km scopes, formed multi-beam networking.
In satellite mobile communication system, Radio Link connection (Radio Link) is in the communication terminal of activated state from one When individual wave beam is moved to the coverage of another wave beam, satellite mobile communication system needs to complete handover between cells (Inter- Cell Handover), to ensure the continuity of the connection of the Radio Link of communication terminal and business.
But radio signal propagation time delay is far above the signal in land mobile communication system in satellite mobile communication system Propagation delay, cell are easily caused communication service and interrupted for a long time when switching, hence it is evident that reduce telecommunication service quality.
The content of the invention
Based on this, it is necessary to which big for radio signal propagation time delay in above-mentioned satellite mobile communication system, switching is easily caused Communication service is interrupted, reduces the problem of telecommunication service quality for a long time, there is provided a kind of cell switching method in communication system and System.
A kind of cell switching method in communication system, comprises the following steps：
Communication terminal is received to the random access channel resource of each handover candidate cells；
Stochastic accessing synchronization is sent to each handover candidate cells by the random access channel resource in measurement time slot Symbol；
Switching command is received, it is small according to the target of uplink synchronous configuration request that the switching command includes serving cell Area is the wireless resource scheduling information of communication terminal distribution, and the Target cell is one in handover candidate cells, institute State response message of the uplink synchronous configuration information for the Target cell to the Stochastic accessing synchronizing symbol；
The switching command is responded, according to the wireless resource scheduling information by the communication terminal from the serving cell It is switched to the Target cell.
A kind of cell handover system in communication system, including：
Channel resource receiving module, for receiving communication terminal to the random access channel resource of each handover candidate cells；
Stochastic accessing module, in measurement time slot by the random access channel resource to each handover candidate cells Send Stochastic accessing synchronizing symbol；
Command reception module, for receiving switching command, the switching command is matched somebody with somebody including serving cell according to uplink synchronous The Target cell for putting information request is the wireless resource scheduling information of communication terminal distribution, and the Target cell is waited for switching One in cell is selected, the uplink synchronous configuration information is response of the Target cell to the Stochastic accessing synchronizing symbol Message；
Handover module, for responding the switching command, according to the wireless resource scheduling information by the communication terminal The Target cell is switched to from the serving cell.
Cell switching method and system in above-mentioned communication system, are provided in measurement time slot by the RACH Source sends Stochastic accessing synchronizing symbol to each handover candidate cells.Receive containing the nothing that Target cell is communication terminal distribution The switching command of line resource scheduling information, and the switching command is responded, will be described logical according to the wireless resource scheduling information Letter terminal is switched to the Target cell from the serving cell.It can be obtained before disconnecting the connection with serving cell and switching over The wireless resource scheduling information needed for Target cell must be switched to, without after switching command is received to Target cell initiate with Machine accesses, and caused business interruption time when can greatly reduce switching service area, improves telecommunication service quality and Consumer's Experience.
A kind of cell switching method in communication system, comprises the following steps：
The uplink synchronous configuration information of each handover candidate cells response Stochastic accessing synchronizing symbol generation is received, wherein, institute State Stochastic accessing synchronizing symbol from communication terminal in measurement time slot by random access channel resource to each handover candidate cells Send；
Handover request is sent to Target cell, the Target cell is one in each handover candidate cells, the switching Request includes the uplink synchronous configuration information that the Target cell responds the Stochastic accessing synchronizing symbol generation；
Receive the Target cell and respond the handover request, distribute to the wireless resource scheduling letter of the communication terminal Breath；
Switching command is sent to the communication terminal, the communication terminal from serving cell is switched to the target small Area, the switching command include the wireless resource scheduling information.
A kind of cell handover system in communication system, including：
Synchronizing information receiving module, the up same of Stochastic accessing synchronizing symbol generation is responded with each handover candidate cells are received Configuration information is walked, wherein, the Stochastic accessing synchronizing symbol is provided by communication terminal in measurement time slot by RACH Source is sent to each handover candidate cells；
Handover request module, for sending handover request to Target cell, the Target cell is each handover candidate cells In one, the handover request includes the Target cell and responds the uplink synchronous of Stochastic accessing synchronizing symbol generation matching somebody with somebody Confidence ceases；
Schedule information receiving module, the communication is distributed to eventually for receiving the Target cell response handover request The wireless resource scheduling information at end；
Switching command sending module, for sending switching command to the communication terminal, make the communication terminal from service Cell is switched to the Target cell, and the switching command includes the wireless resource scheduling information.
Cell switching method and system in above-mentioned communication system, the Stochastic accessing based on Target cell response communication terminal The uplink synchronous configuration information of synchronizing symbol generation sends handover request to Target cell, and then obtains Target cell and distribute to institute The wireless resource scheduling information of communication terminal is stated, and is sent with switching command to the communication terminal, the communication terminal is existed The wireless resource scheduling information being switched to needed for the Target cell can be obtained before disconnecting the connection with serving cell.Enter And make the communication terminal after switching command is received without to Target cell initiating random access procedure, switching can be reduced Caused business interruption time during service area, improve telecommunication service quality and Consumer's Experience.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the cell switching method first embodiment in communication system of the present invention；
Fig. 2 is the schematic flow sheet of the cell switching method second embodiment in communication system of the present invention；
Fig. 3 is the structural representation of the cell handover system first embodiment in communication system of the present invention；
Fig. 4 is the schematic flow sheet of the embodiment of cell switching method the 3rd in communication system of the present invention；
Fig. 5 is the schematic flow sheet of the embodiment of cell switching method the 4th in communication system of the present invention；
Fig. 6 is the structural representation of the embodiment of cell handover system the 3rd in communication system of the present invention；
Fig. 7 is the structural representation of the embodiment of cell handover system the 4th in communication system of the present invention；
Fig. 8 is the schematic flow sheet of the embodiment of cell switching method the 5th in communication system of the present invention；
Fig. 9 is the schematic flow sheet of the embodiment of cell switching method the 6th in communication system of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not For limiting the present invention.
Referring to Fig. 1, Fig. 1 is the flow signal of the cell switching method first embodiment in the communication system of the present invention Figure.
Cell switching method in the communication system of present embodiment, it is therefore preferable to the operation of communication terminal side, can Comprise the following steps：
Step S101, communication terminal is received to the random access channel resource of each handover candidate cells.
Step S102, each handover candidate cells are sent at random by the random access channel resource in measurement time slot Access synchronizing symbol.
Step S103, switching command is received, the switching command includes serving cell please according to uplink synchronous configuration information The Target cell asked is the wireless resource scheduling information of communication terminal distribution, and the Target cell is in handover candidate cells One, the uplink synchronous configuration information is the Target cell to the response message of the Stochastic accessing synchronizing symbol.
Step S104, the switching command is responded, according to the wireless resource scheduling information by the communication terminal from institute State serving cell and be switched to the Target cell.
The cell switching method in communication system described in present embodiment, passes through the Stochastic accessing in measurement time slot Channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells.It is the communication terminal point to receive containing Target cell The switching command for the wireless resource scheduling information matched somebody with somebody, and the switching command is responded, will according to the wireless resource scheduling information The communication terminal is switched to the Target cell from the serving cell.It can be switched over disconnecting the connection with serving cell Before, obtain and be switched to wireless resource scheduling information needed for Target cell, without after switching command is received to Target cell Stochastic accessing is initiated, caused business interruption time when can reduce switching service area, improves telecommunication service quality and Consumer's Experience.
Wherein, for step S101, it is preferable that serving cell is currently progress signaling and data transfer between communication terminal Communication cell.Handover candidate cells are neighbor cell.Communication terminal can be mobile terminal.The random access channel resource is excellent Selection of land by the serving cell keep be connected with communication terminal while, the cell based on serving cell and handover candidate cells Between cooperating process to handover candidate cells ask gained.In other embodiments, can also be by communication terminal in measurement time slot The system broadcast information of each handover candidate cells is received, and then the RACH is read from the system broadcast information The configuration information of resource.
Further, the random access channel resource may include noncompetitive random access resource.It may also include competition Property random access resource.The noncompetitive random access resource can be one or one group of accidental access signal, as LTE is used ZC sequences, and the sequential of transmission signal and frequency offset amount.
In one embodiment, in the reception communication terminal to the random access channel resource of each handover candidate cells Before step, it can also include the steps of：
Radio link quality measurement is carried out to the link of serving cell to communication terminal.
If the measured value of the radio link quality measurement is less than link quality threshold, notice serving cell is described logical Believe terminal request to the random access channel resource of handover candidate cells.
The present embodiment, link quality threshold, notice service can be less than in the link-quality of serving cell to communication terminal amount Cell is random access channel resource of the communication terminal request to handover candidate cells, makees early-stage preparations for cell switching.
Preferably, the link quality threshold can be cell signal receiving intensity threshold value, cell reference signals intensity threshold, Cell reference signals quality threshold or cell signal interference are than threshold value etc..
In another embodiment, the cell measurement configuration information of serving cell transmission can be received, from the cell measurement The random access channel resource is read in configuration information.The cell measurement configuration information may include the phase of handover candidate cells Close information, handover candidate cells distribute to the random access channel resource of communication terminal, measurement time slot configuration and serving cell with Collaboration mode (close coupling or no tight coupling) between handover candidate cells.
For step S102, the measurement time slot can be wirelessly transferred schedule gaps or the service for the communication terminal Wireless measurement time slot set by cell.The message that communication terminal can be sent by serving cell from DCCH obtains pair Answer the time slot configuration information of the measurement time slot.
Further, in the disconnection of initial time communication terminal and the connection of serving cell of measurement time slot, waited with each switching Select cell to reach down-going synchronous, then initiate radio link quality measurement and sent by the random access channel resource random Access synchronizing symbol.It can also read the system broadcast information of each handover candidate cells.In the termination time of the measurement time slot, lead to Believe that terminal recovers the connection with serving cell.
Further, communication terminal can be to multiple handover candidate cells in same measurement time slot or different measurement time slots Carry out the radio link quality measurement of serial or parallel.
In one embodiment, each handover candidate cells are sent out by the random access channel resource in measurement time slot The step of sending Stochastic accessing synchronizing symbol is further comprising the steps of：
The downstream wireless signals of each handover candidate cells are received in second group of measurement time slot.
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, institute Stating radio link quality measurement report includes corresponding radio link quality parameter.
The radio link quality measurement report is sent to the serving cell.
The present embodiment, each handover candidate cells carry out radio link quality measurement in measurement time slot, can be to be waited from switching Select and Target cell offer basis for selecting is provided in cell.
Preferably, the downstream wireless signals of each handover candidate cells can have both been received in same measurement time slot to each switching Candidate cell carries out radio link quality measurement, and sends Stochastic accessing synchronizing symbol to each handover candidate cells.Can also be not Radio link quality measurement is carried out to each handover candidate cells with the time slot inscribed downstream wireless signals for receiving each handover candidate cells, Stochastic accessing synchronizing symbol is sent to each handover candidate cells.
Further, the downstream wireless signals of each handover candidate cells can be received to each simultaneously in same measurement time slot Handover candidate cells carry out radio link quality measurement.Also the descending nothing of each handover candidate cells can be received in different measurement time slots Line signal carries out radio link quality measurement to each handover candidate cells.There is default time delay between different measurement time slots.It is described default Time delay and the measurement time slot can be set by serving cell, and inform communication eventually by DCCH message by serving cell End.
Further, for LTE technologies, during identical networking, communication terminal with serving cell while keeping communicating Do not need measurement time slot to receive the downstream wireless signals of each handover candidate cells and radio chains are carried out to each handover candidate cells Road mass measurement, during inter-frequency networking, then communication terminal needs measurement time slot to receive the descending wireless of each handover candidate cells Signal carries out radio link quality measurement to each handover candidate cells.
In another embodiment, in measurement time slot by the random access channel resource to each handover candidate cells The step of sending Stochastic accessing synchronizing symbol is further comprising the steps of：
Receive the downstream wireless signals of each handover candidate cells.
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, institute Stating radio link quality measurement report includes the radio link quality parameter between communication terminal and corresponding handover candidate cells.
Each handover candidate cells, which are received, in the 3rd group of measurement time slot responds the up of the Stochastic accessing synchronizing symbol generation Synchronous configuration information.
The uplink synchronous configuration information is loaded into the radio link quality measurement report.
The radio link quality measurement report is sent to the serving cell.
The present embodiment, the uplink synchronous configuration information is loaded into the radio link quality measurement report.To institute State serving cell and send the radio link quality measurement report.
Preferably, the radio link quality parameter includes cell received signal strength, signal-to-noise ratio etc. for characterizing The parameter of communication terminal and the link-quality of handover candidate cells.
Further, each handover candidate cells can be received in same measurement time slot and respond the Stochastic accessing synchronously symbol The uplink synchronous configuration information of number generation, it is described random can also to receive the response of different handover candidate cells in different measurement time slots Access the uplink synchronous configuration information of synchronizing symbol generation.
For step S103, the switching command preferably may include the mobility control information of communication terminal, wireless money Source schedule information, the wireless resource scheduling information may include that the Target cell distributes to the up-downgoing letter of the communication terminal Make, the Radio Resource of data transfer and the license communication terminal start wireless output and the temporal information of wireless receiving.
Further, the uplink synchronous configuration information may include Domain Synchronous Configuration Values, frequency domain synchronization Configuration Values and on Row transmission power is horizontal.Further, the Target cell can be chosen by communication terminal from handover candidate cells, also can be by Serving cell is chosen from handover candidate cells.Basis for selecting can be the link-quality ginseng of communication terminal and handover candidate cells Number, or handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.Can also be this The usual other specification of art personnel.
For step S104, the handover candidate cells can alternatively pertain to different communication cells from the serving cell, with Realize switching of the communication terminal between different districts.The handover candidate cells and the serving cell can be same cell, To realize switching of the communication terminal in cell.
In one embodiment, after the switching command is received, communication terminal can disconnect and serving cell immediately Wireless connection, the wireless connection with Target cell is established according to the wireless resource scheduling information.Reaching and Target cell It can start wireless output after down-going synchronous with the license communication terminal in the wireless resource scheduling information and receive Temporal information corresponding to time point start be wirelessly transferred and receive, without triggering uplink synchronous process.
Communication system in present embodiment is preferably satellite mobile communication system, and method of the invention can move satellite Handover delay is reduced to 5.5ms in dynamic communication system.
In other embodiments, the inventive method, which applies also for other of this area, has long delay channel characteristics GSM, to reduce handover delay, improve communication quality.
Referring to Fig. 2, Fig. 2 is the flow signal of the cell switching method second embodiment in the communication system of the present invention Figure.
The difference of cell switching method and first embodiment in the communication system of present embodiment is：Surveying Measure the step of Stochastic accessing synchronizing symbol is sent to each handover candidate cells by the random access channel resource in time slot also Comprise the following steps：
Step S201, each handover candidate cells are sent by the random access channel resource in first group of measurement time slot Stochastic accessing synchronizing symbol.
Step S202, the measurement time slot after first group of measurement time slot are received described in each handover candidate cells response The uplink synchronous configuration information of Stochastic accessing synchronizing symbol generation.
Step S203, the uplink synchronous configuration information of each handover candidate cells response is sent to the serving cell.
Present embodiment, it is the cell of no tight coupling collaboration mode suitable for cooperation mode.
Wherein, for step S201, the descending nothing of each handover candidate cells can also be received in first group of measurement time slot Line signal carries out radio link quality measurement to each handover candidate cells.When first group of measurement time slot can be a measurement Gap, Stochastic accessing synchronizing symbol is sent to each handover candidate cells by the random access channel resource simultaneously.Described first Group measurement time slot may include multiple measurement time slots, be connect at random by described in the different measurement time slots of first group of measurement time slot Enter channel resource and Stochastic accessing synchronizing symbol is sent to each handover candidate cells.
For step S202, it is preferable that the measurement that can be delayed in default after first group of measurement time slot The uplink synchronous configuration information that each handover candidate cells respond the Stochastic accessing synchronizing symbol generation is received in time slot.It is described pre- If time delay can be set by serving cell or be set by communication terminal.
For step S203, the uplink synchronous configuration information can be loaded into the Radio Link to each handover candidate cells The serving cell is sent in quality measurement reports.
Referring to Fig. 3, Fig. 3 is the structural representation of the cell handover system first embodiment in the communication system of the present invention Figure.
Cell handover system in the communication system of present embodiment is preferably installed in communication terminal, it may include letter Road resource receiving module 100, Stochastic accessing module 200, command reception module 300 and handover module 400, wherein：
Channel resource receiving module 100, provided for receiving communication terminal to the RACH of each handover candidate cells Source.
Stochastic accessing module 200, in measurement time slot by the random access channel resource to each handoff candidate Cell sends Stochastic accessing synchronizing symbol.
Command reception module 300, for receiving switching command, the switching command includes serving cell according to uplink synchronous The Target cell of configuration request is the wireless resource scheduling information of communication terminal distribution, and the Target cell is switching One in candidate cell, the uplink synchronous configuration information is sound of the Target cell to the Stochastic accessing synchronizing symbol Answer message.
Handover module 400, it is according to the wireless resource scheduling information that the communication is whole for responding the switching command End is switched to the Target cell from the serving cell.
The cell handover system in communication system described in present embodiment, passes through the Stochastic accessing in measurement time slot Channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells.It is the communication terminal point to receive containing Target cell The switching command for the wireless resource scheduling information matched somebody with somebody, and the switching command is responded, will according to the wireless resource scheduling information The communication terminal is switched to the Target cell from the serving cell.It can be switched over disconnecting the connection with serving cell Before, the wireless resource scheduling information being switched to needed for Target cell is obtained, without small to target after switching command is received Area initiates Stochastic accessing, caused business interruption time when can reduce switching service area, improves telecommunication service quality and user's body Test.
Wherein, for channel resource receiving module 100, it is preferable that serving cell is that letter is currently carried out between communication terminal Order and the communication cell of data transfer.Handover candidate cells are neighbor cell.Communication terminal can be mobile terminal.It is described to connect at random Enter channel resource preferably by the serving cell while keeping being connected with communication terminal, based on serving cell and switching time The minizone cooperating process of cell is selected to ask gained to handover candidate cells.In other embodiments, can also be by communication terminal The system broadcast information of each handover candidate cells is received in measurement time slot, and then from the system broadcast information described in reading Random access channel resource.
Further, the random access channel resource may include noncompetitive random access resource.It may also include competition Property random access resource.The noncompetitive random access resource can be one or one group of accidental access signal, as LTE is used ZC sequences, and the sequential of transmission signal and frequency offset amount.
In one embodiment, in the reception communication terminal to the random access channel resource of each handover candidate cells Before step, it can also include the steps of：
Radio link quality measurement is carried out to the link of serving cell to communication terminal.
If the measured value of the radio link quality measurement is less than link quality threshold, notice serving cell is described logical Believe terminal request to the random access channel resource of handover candidate cells.
The present embodiment, link quality threshold, notice service can be less than in the link-quality of serving cell to communication terminal amount Cell is random access channel resource of the communication terminal request to handover candidate cells, makees early-stage preparations for cell switching.
In another embodiment, the cell measurement configuration information of serving cell transmission can be received, from the cell measurement The random access channel resource is read in configuration information.The cell measurement configuration information may include the phase of handover candidate cells Close information, handover candidate cells distribute to the random access channel resource of communication terminal, measurement time slot configuration and serving cell with Collaboration mode (close coupling or no tight coupling) between handover candidate cells.
For Stochastic accessing module 200, the measurement time slot can be the communication terminal be wirelessly transferred schedule gaps or Wireless measurement time slot set by the serving cell.The message that communication terminal can be sent by serving cell from DCCH Obtain the time slot configuration information of the corresponding measurement time slot.
Further, in the disconnection of initial time communication terminal and the connection of serving cell of measurement time slot, waited with each switching Select cell to reach down-going synchronous, then initiate radio link quality measurement and sent by the random access channel resource random Access synchronizing symbol.It can also read the system broadcast information of each handover candidate cells.In the termination time of the measurement time slot, lead to Believe that terminal recovers the connection with serving cell.
Further, communication terminal can be to multiple handover candidate cells in same measurement time slot or different measurement time slots Carry out the radio link quality measurement of serial or parallel.
In one embodiment, Stochastic accessing module 200 can be used for：
The downstream wireless signals of each handover candidate cells are received in second group of measurement time slot.
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, institute Stating radio link quality measurement report includes corresponding radio link quality parameter.
The radio link quality measurement report is sent to the serving cell.
The present embodiment, each handover candidate cells carry out radio link quality measurement in measurement time slot, can be to be waited from switching Select and Target cell offer basis for selecting is provided in cell.
Preferably, the downstream wireless signals of each handover candidate cells can have both been received in same measurement time slot to each switching Candidate cell carries out radio link quality measurement, and sends Stochastic accessing synchronizing symbol to each handover candidate cells.Can also be not Radio link quality measurement is carried out to each handover candidate cells with the time slot inscribed downstream wireless signals for receiving each handover candidate cells, Stochastic accessing synchronizing symbol is sent to each handover candidate cells.
Further, the downstream wireless signals of each handover candidate cells can be received to each simultaneously in same measurement time slot Handover candidate cells carry out radio link quality measurement.Also can different measurement time slots receive the descending wireless of each handover candidate cells Signal carries out radio link quality measurement to each handover candidate cells.There is default time delay between different measurement time slots.When described default Prolong and can be set with the measurement time slot by serving cell, and inform communication eventually by DCCH message by serving cell End.
Further, for LTE technologies, during identical networking, communication terminal with serving cell while keeping communicating Do not need measurement time slot to receive the downstream wireless signals of each handover candidate cells and radio chains are carried out to each handover candidate cells Road mass measurement, during inter-frequency networking, communication terminal then needs measurement time slot to receive the descending wireless of each handover candidate cells Signal carries out radio link quality measurement to each handover candidate cells.
In another embodiment, Stochastic accessing module 200 can be additionally used in：
Receive the downstream wireless signals of each handover candidate cells.
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, institute Stating radio link quality measurement report includes the radio link quality parameter between communication terminal and corresponding handover candidate cells.
Each handover candidate cells, which are received, in the 3rd group of measurement time slot responds the up of the Stochastic accessing synchronizing symbol generation Synchronous configuration information.
The uplink synchronous configuration information is loaded into the radio link quality measurement report.
The radio link quality measurement report is sent to the serving cell.
The present embodiment, the uplink synchronous configuration information is loaded into the radio link quality measurement report.To institute State serving cell and send the radio link quality measurement report.
Preferably, the radio link quality parameter includes cell received signal strength, signal-to-noise ratio etc. for characterizing The parameter of communication terminal and the link-quality of handover candidate cells.
Further, each handover candidate cells can be received in same measurement time slot and respond the Stochastic accessing synchronously symbol The uplink synchronous configuration information of number generation, it is described random can also to receive the response of different handover candidate cells in different measurement time slots Access the uplink synchronous configuration information of synchronizing symbol generation.
For command reception module 300, the switching command preferably may include communication terminal mobility control information, Wireless resource scheduling information, the wireless resource scheduling information may include that the Target cell distributes to the upper of the communication terminal Downlink signaling, the Radio Resource of data transfer and the license communication terminal start wireless output and the time of wireless receiving believes Breath.
Further, the uplink synchronous configuration information may include Domain Synchronous Configuration Values, frequency domain synchronization Configuration Values and on Row transmission power is horizontal.Further, the Target cell can be chosen by communication terminal from handover candidate cells, also can be by Serving cell is chosen from handover candidate cells.Basis for selecting can be the link-quality ginseng of communication terminal and handover candidate cells Number, or handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.Can also be this The usual other specification of art personnel.
For handover module 400, the handover candidate cells can alternatively pertain to different communication cells from the serving cell, To realize switching of the communication terminal between different districts.The handover candidate cells can be same small with the serving cell Area, to realize switching of the communication terminal in cell.
In one embodiment, after the switching command is received, communication terminal can disconnect and serving cell immediately Wireless connection, the wireless connection with Target cell is established according to the wireless resource scheduling information.Reaching and Target cell It can start wireless output after down-going synchronous with the license communication terminal in the wireless resource scheduling information and receive Temporal information corresponding to time point start be wirelessly transferred and receive, without triggering uplink synchronous process.
Communication system in present embodiment is preferably satellite mobile communication system, and method of the invention can move satellite Handover delay is reduced to 5.5ms in dynamic communication system.
In other embodiments, the inventive method, which applies also for other of this area, has long delay channel characteristics GSM, to reduce handover delay, improve communication quality.
As described below is the cell handover system second embodiment in communication system of the invention.
The difference of cell handover system and first embodiment in the communication system of present embodiment is：At random AM access module 200 can be additionally used in：
Stochastic accessing is sent to each handover candidate cells by the random access channel resource in first group of measurement time slot Synchronizing symbol.
Measurement time slot after first group of measurement time slot receives each handover candidate cells and responds the Stochastic accessing The uplink synchronous configuration information of synchronizing symbol generation.
The uplink synchronous configuration information of each handover candidate cells response is sent to the serving cell.
Present embodiment, it is the cell of no tight coupling collaboration mode suitable for cooperation mode.
Wherein, for Stochastic accessing module 200, each handover candidate cells can also be received in first group of measurement time slot Downstream wireless signals carry out radio link quality measurement to each handover candidate cells.First group of measurement time slot can be a survey Time slot is measured, Stochastic accessing synchronizing symbol is sent to each handover candidate cells by the random access channel resource simultaneously.It is described First group of measurement time slot may include multiple measurement time slots, pass through the Stochastic accessing in the different measurement time slots of the described first measurement Channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells.
Preferably, each switching is received in the measurement time slot delayed in default after first group of measurement time slot Candidate cell responds the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.The default time delay can be small by servicing Area sets or set by communication terminal.
Further, the uplink synchronous configuration information can be loaded into the radio link quality to each handover candidate cells The serving cell is sent in measurement report.
Referring to Fig. 4, Fig. 4 is the flow signal of the embodiment of cell switching method the 3rd in the communication system of the present invention Figure.
Cell switching method in the communication system of present embodiment, it is therefore preferable to the operation of serving cell side, can Comprise the following steps：
Step S401, the uplink synchronous for receiving each handover candidate cells response Stochastic accessing synchronizing symbol generation match somebody with somebody confidence Breath, wherein, the Stochastic accessing synchronizing symbol from communication terminal in measurement time slot by random access channel resource to respectively cutting Change candidate cell transmission.
Step S402, handover request being sent to Target cell, the Target cell is one in each handover candidate cells, The handover request includes the uplink synchronous configuration information that the Target cell responds the Stochastic accessing synchronizing symbol generation.
Step S403, receive the Target cell and respond the Radio Resource that the handover request distributes to the communication terminal Schedule information.
Step S404, switching command is sent to the communication terminal, the communication terminal is switched to institute from serving cell Target cell is stated, the switching command includes the wireless resource scheduling information.
The cell switching method in communication system described in present embodiment, based on Target cell response communication terminal with The uplink synchronous configuration information of machine access synchronizing symbol generation sends handover request to Target cell, and then obtains Target cell point The wireless resource scheduling information of communication terminal described in dispensing, and sent with switching command to the communication terminal, make the communication Terminal can obtain the wireless resource scheduling being switched to needed for the Target cell before the connection with serving cell is disconnected Information.And then the communication terminal is set to be reduced without initiating Stochastic accessing to Target cell after switching command is received Caused business interruption time when switching service area, improve telecommunication service quality and Consumer's Experience.
Wherein, for step S401, it is preferable that the uplink synchronous configuration information may include Domain Synchronous Configuration Values, frequency Domain synchronization Configuration Values and uplink transmission power are horizontal.
Preferably, the uplink synchronous configuration information of communication terminal transmission can be received, it is small can also to receive each handoff candidate The uplink synchronous configuration information that area is sent.
In one embodiment, the up of each handover candidate cells response Stochastic accessing synchronizing symbol generation is received described It is further comprising the steps of before the step of synchronous configuration information：
Communication terminal is obtained to the random access channel resource of each handover candidate cells, and send to the communication terminal.
Preferably, can serving cell detect communication terminal up-link link-quality be less than link quality threshold when, Or receive communication terminal transmission random access channel resource request when, it is described request may include be used for identify service area to lead to Believe that the link-quality of terminal is less than the information of link quality threshold, transfer the random access channel resource to prestore or initiate minizone Cooperation, to each handover candidate cells Real time request communication terminal to the random access channel resource of each handover candidate cells.
In another embodiment, the uplink synchronous of each handover candidate cells response Stochastic accessing synchronizing symbol generation is received The step of configuration information, comprises the following steps：
Receive each handover candidate cells and respond the response message that the Stochastic accessing synchronizing symbol is sent, disappear from the response The uplink synchronous configuration information that handover candidate cells respond the Stochastic accessing synchronizing symbol generation is read in breath.Or, reception pair The radio link quality measurement report of each handover candidate cells is answered, handover candidate cells response institute is read from the response message The uplink synchronous configuration information of Stochastic accessing synchronizing symbol generation is stated, the radio link quality measurement report includes Radio Link Mass parameter and handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.
For step S402, the handover request preferably may include the contextual information of communication terminal, communication terminal point Not the radio transmission time delay of the serving cell and the Target cell, be wirelessly transferred carrying information and operation quality requirement, And the Target cell responds the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.
Further, the Target cell can be chosen by communication terminal from handover candidate cells, also can be by serving cell Chosen from handover candidate cells.Basis for selecting can be between communication terminal and handover candidate cells radio link quality parameter, Or handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.It can also be this area The usual other specification of technical staff.
In one embodiment, the step of sending handover request to the Target cell comprises the following steps：
By the communication terminal respectively in the radio transmission time delay of the serving cell and the Target cell, the communication Terminal iidentification in the contextual information of terminal, it is wirelessly transferred carrying information and operation quality requirement and the Target cell The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation is responded, is loaded into the handover request.
The handover request is sent to the Target cell.
The wireless resource scheduling for receiving the Target cell response handover request and distributing to the communication terminal The step of information, comprises the following steps：
Receive the Target cell and respond the wireless resource scheduling information that the handover request distributes to the communication terminal, The wireless resource scheduling information includes the Target cell and distributes to the up-downgoing signaling of the communication terminal, data transfer Radio Resource and the license communication terminal start the wireless temporal information exported with receiving.
The present embodiment, further enhance the handover negotiation optimization of minizone.
Preferably, permit that the communication terminal starts wireless output and the temporal information of wireless receiving corresponds to Intra-cell Processing delay, inter-cell communication radio transmission time delay, communication terminal are inside the radio transmission time delay of serving cell, communication terminal The radio transmission time delay of processing delay and communication terminal between Target cell.
Further, Target cell can be estimated by below equation permits the communication terminal to start wireless output and wireless The time point of reception：
M=T+t+X+Y+Z；
Wherein, M is communication overall delay, and T is Intra-cell processing delay, can be default fixed value；T is inter-cell communication Propagation delay time, can be default fixed value；X is radio transmission time delay of the communication terminal in serving cell.It is small to may be included in service Area is sent in the handover request of Target cell；Z is communication end node inter-process time delay, including parses and perform switching and refer to Make, be synchronized to the operation required time such as Target cell, can be default fixed value；Y is nothing of the communication terminal between Target cell Line propagation delay time, the random access procedure that can be initiated by communication terminal to Target cell measure, and may be included in serving cell hair Into the handover request of Target cell.
Obtained according to the communication overall delay M of gained and permit the communication terminal to start wireless output and wireless receiving accordingly Time point.
The communication terminal respectively generally can dynamic in the radio transmission time delay of the serving cell and the Target cell Change, therefore the dynamic estimation license communication terminal startup is wirelessly exported when can further be reduced with the time point of wireless receiving Prolong.Otherwise, just a larger value can only be preset according to the distribution situation of time delay value, become to adapt to a variety of time delays Change.Above-mentioned method for optimizing is used in satellite communication system, the effect for reducing time delay becomes apparent from.
In another embodiment, it is further comprising the steps of before the step of sending handover request to Target cell：
Receive the radio link quality measurement report of corresponding each handover candidate cells, the radio link quality measurement report Including the radio link quality parameter between handover candidate cells and communication terminal.
The radio link quality parameter is read from the radio link quality measurement report in corresponding each handover candidate cells.
The radio link quality parameter read according to corresponding each handover candidate cells, selectes the nothing between the communication terminal Wired link quality meets that the handover candidate cells of default communication condition are Target cell.
The present embodiment, by the radio link quality parameter of corresponding each handover candidate cells, select and the communication terminal Between radio link quality meet that the handover candidate cells of default communication condition be Target cell, leading to after cell switching can be improved Believe quality.
Preferably, the radio link quality that the default communication condition can be between handover candidate cells and communication terminal is higher than Radio link quality between serving cell and communication terminal.
For step S403, it is preferable that the wireless resource scheduling information may include the Target cell according on described It is described logical that the synchronous configuration information of row distributes to the up-downgoing signaling of the communication terminal, the Radio Resource of data transfer and license Believe that terminal starts wireless output and the temporal information of wireless receiving.
In one embodiment, Target cell is after the handover request is received, according to serving cell, Target cell and Communication terminal is to switching the processing delay of related signaling, and Target cell and serving cell wirelessly pass between communication terminal respectively Defeated time delay, calculate communication terminal and start the time point being wirelessly transferred with receiving.
For step S404, the switching command preferably may include the mobility control information of communication terminal, wireless money Source schedule information, the wireless resource scheduling information may include that the Target cell distributes according to the uplink synchronous configuration information The Radio Resource and the license communication terminal of up-downgoing signaling, data transfer to the communication terminal start wireless output With the temporal information of wireless receiving.
Referring to Fig. 5, Fig. 5 is the flow signal of the embodiment of cell switching method the 4th in the communication system of the present invention Figure.
Cell switching method and the difference of the 3rd embodiment in the communication system of present embodiment are：Institute Before the step of stating the uplink synchronous configuration information for receiving each handover candidate cells response Stochastic accessing synchronizing symbol generation, also wrap Include following steps：
Step S501, minizone cooperation is initiated, and ask the communication terminal to be waited to each switching to each handover candidate cells Select the random access channel resource of cell.
Step S502, it is the random access channel resource that the communication terminal distributes to receive each handover candidate cells, and to The communication terminal is sent.
Present embodiment, can be before communication terminal terminates the communication with serving cell, for communication eventually by minizone cooperation End obtains the random access channel resource needed for Stochastic accessing Target cell.
Wherein, close coupling collaboration mode and no tight coupling collaboration mode are included for step S501, minizone cooperation.
In one embodiment, minizone cooperation is being initiated, and is asking the communication terminal to arrive to each handover candidate cells It is further comprising the steps of before the step of random access channel resource of each handover candidate cells：
Radio link quality detection is carried out to the link of the communication terminal to the serving cell.
If the measured value of the radio link quality detection is less than link quality threshold, initiates minizone and cooperate, and to The communication terminal is asked to the random access channel resource of each handover candidate cells in each handover candidate cells.
Referring to Fig. 6, Fig. 6 is the structural representation of the embodiment of cell handover system the 3rd in the communication system of the present invention Figure.
Cell handover system in the communication system of present embodiment, is preferably installed in serving cell side, can wrap Include synchronizing information receiving module 500, handover request module 600, schedule information receiving module 700 and switching command sending module 800, wherein：
Synchronizing information receiving module 500, for receiving each handover candidate cells response Stochastic accessing synchronizing symbol generation Uplink synchronous configuration information, wherein, the Stochastic accessing synchronizing symbol passes through Stochastic accessing by communication terminal in measurement time slot Channel resource is sent to each handover candidate cells.
Handover request module 600, for sending handover request to Target cell, the Target cell is that each handoff candidate is small One in area, the handover request includes the uplink synchronous that the Target cell responds the Stochastic accessing synchronizing symbol generation Configuration information.
Schedule information receiving module 700, described lead to is distributed to for receiving the Target cell response handover request Believe the wireless resource scheduling information of terminal.
Switching command sending module 800, for sending switching command to the communication terminal, make the communication terminal from clothes Business cell is switched to the Target cell, and the switching command includes the wireless resource scheduling information.
The cell handover system in communication system described in present embodiment, based on Target cell response communication terminal with The uplink synchronous configuration information of machine access synchronizing symbol generation sends handover request to Target cell, and then obtains Target cell point The wireless resource scheduling information of communication terminal described in dispensing, and sent with switching command to the communication terminal, make the communication Terminal can obtain the wireless resource scheduling being switched to needed for the Target cell before the connection with serving cell is disconnected Information.And then the communication terminal is set to be reduced without initiating Stochastic accessing to Target cell after switching command is received Caused business interruption time when switching service area, improve telecommunication service quality and Consumer's Experience.
Wherein, for synchronizing information receiving module 500, it is preferable that the uplink synchronous configuration information may include that time domain is same It is horizontal to walk Configuration Values, frequency domain synchronization Configuration Values and uplink transmission power.
Preferably, the uplink synchronous configuration information of communication terminal transmission can be received, it is small can also to receive each handoff candidate The uplink synchronous configuration information that area is sent.
In one embodiment, can also the up of each handover candidate cells response Stochastic accessing synchronizing symbol generation received Before synchronous configuration information, communication terminal is obtained to the random access channel resource of each handover candidate cells, and to the communication Terminal is sent.
Preferably, can serving cell detect communication terminal up-link link-quality be less than link quality threshold when, Or receive communication terminal transmission random access channel resource request when, it is described request may include be used for identify service area to lead to Believe that the link-quality of terminal is less than the information of link quality threshold, transfer the random access channel resource to prestore or initiate minizone Cooperation, to each handover candidate cells Real time request communication terminal to the random access channel resource of each handover candidate cells.
In another embodiment, synchronizing information receiving module 500 can be used for：
Receive each handover candidate cells and respond the response message that the Stochastic accessing synchronizing symbol is sent, disappear from the response The uplink synchronous configuration information that handover candidate cells respond the Stochastic accessing synchronizing symbol generation is read in breath.Or receive The radio link quality measurement report of corresponding each handover candidate cells, handover candidate cells response is read from the response message The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation, the radio link quality measurement report include passing through institute State the radio link quality parameter that random access channel resource carries out radio link quality measurement gained to each handover candidate cells The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation is responded with handover candidate cells.
For handover request module 600, the handover request preferably may include the contextual information of communication terminal, communication Terminal respectively in the radio transmission time delay of the serving cell and the Target cell, be wirelessly transferred carrying information and quality of service It is required that and the Target cell respond the uplink synchronous configuration information of Stochastic accessing synchronizing symbol generation.
Further, the Target cell can be chosen by communication terminal from handover candidate cells, also can be by serving cell Chosen from handover candidate cells.Basis for selecting can between communication terminal and handover candidate cells link link quality parameter, Or handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation.It can also be this area The usual other specification of technical staff.
In one embodiment, handover request module 600 can be additionally used in：
By the communication terminal respectively in the radio transmission time delay of the serving cell and the Target cell, the communication Terminal iidentification in the contextual information of terminal, it is wirelessly transferred carrying information and operation quality requirement and the Target cell The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation is responded, is loaded into the handover request.
The handover request is sent to the Target cell.
The wireless resource scheduling for receiving the Target cell response handover request and distributing to the communication terminal The step of information, comprises the following steps：
Receive the Target cell and respond the wireless resource scheduling information that the handover request distributes to the communication terminal, The wireless resource scheduling information includes the Target cell and distributes to the up-downgoing signaling of the communication terminal, data transfer Radio Resource and the license communication terminal start the wireless temporal information exported with receiving.
The present embodiment, further enhance the handover negotiation optimization of minizone.
Preferably, permit that the communication terminal starts wireless output and the temporal information of wireless receiving corresponds to Intra-cell Processing delay, inter-cell communication radio transmission time delay, communication terminal are inside the radio transmission time delay communication terminal of serving cell The radio transmission time delay of processing delay and communication terminal between Target cell.
Preferably, permit that the communication terminal starts wireless output and the temporal information of wireless receiving corresponds to Intra-cell Processing delay, inter-cell communication radio transmission time delay, communication terminal are inside the radio transmission time delay of serving cell, communication terminal The radio transmission time delay of processing delay and communication terminal between Target cell.
Further, Target cell can be estimated by below equation permits the communication terminal to start wireless output and wireless The time point of reception：
M=T+t+X+Y+Z；
Wherein, M is communication overall delay, and T is Intra-cell processing delay, can be default fixed value；T is inter-cell communication Propagation delay time, can be default fixed value；X is radio transmission time delay of the communication terminal in serving cell.It is small to may be included in service Area is sent in the handover request of Target cell；Z is communication end node inter-process time delay, including parses and perform switching and refer to Make, be synchronized to the operation required time such as Target cell, can be default fixed value；Y is nothing of the communication terminal between Target cell Line propagation delay time, the random access procedure that can be initiated by communication terminal to Target cell measure, and may be included in serving cell hair Into the handover request of Target cell.
Obtained according to the communication overall delay M of gained and permit the communication terminal to start wireless output and wireless receiving accordingly Time point.
The communication terminal respectively generally can dynamic in the radio transmission time delay of the serving cell and the Target cell Change, therefore the dynamic estimation license communication terminal startup is wirelessly exported when can further be reduced with the time point of wireless receiving Prolong.Otherwise, just a larger value can only be preset according to the distribution situation of time delay value, become to adapt to a variety of time delays Change.Above-mentioned method for optimizing is used in satellite communication system, the effect for reducing time delay becomes apparent from.
In another embodiment, in addition to Target cell chosen module, it is used for：
Receive the radio link quality measurement report of corresponding each handover candidate cells, the radio link quality measurement report Including the radio link quality parameter between handover candidate cells and communication terminal.
The radio link quality parameter is read from the radio link quality measurement report in corresponding each handover candidate cells.
The radio link quality parameter read according to corresponding each handover candidate cells, selectes the nothing between the communication terminal Wired link quality meets that the handover candidate cells of default communication condition are Target cell.
The present embodiment, by the radio link quality parameter of corresponding each handover candidate cells, select and the communication terminal Between radio link quality meet that the handover candidate cells of default communication condition be Target cell, leading to after cell switching can be improved Believe quality.
For schedule information receiving module 700, it is preferable that the wireless resource scheduling information may include the Target cell According to the uplink synchronous configuration information distribute to the up-downgoing signaling of the communication terminal, the Radio Resource of data transfer and The communication terminal is permitted to start wireless output and the temporal information of wireless receiving.
In one embodiment, Target cell is after the handover request is received, according to serving cell, Target cell and Communication terminal is to switching the processing delay of related signaling, and Target cell and serving cell wirelessly pass between communication terminal respectively Defeated time delay, calculate communication terminal and start the time point being wirelessly transferred with receiving.
For switching command sending module 800, the switching command preferably may include the mobility control of communication terminal Information, wireless resource scheduling information, the wireless resource scheduling information may include the Target cell according to the uplink synchronous Configuration information distributes to the up-downgoing signaling of the communication terminal, the Radio Resource of data transfer and the license communication terminal Start wireless output and the temporal information of wireless receiving.
Referring to Fig. 7, Fig. 7 is the structural representation of the embodiment of cell handover system the 4th in the communication system of the present invention Figure.
The difference of cell handover system and the 3rd embodiment in the communication system of present embodiment is：Also wrap Channel resources request module 900 is included, is used for：
Initiate minizone cooperation, and to each handover candidate cells ask the communication terminal to each handover candidate cells with Machine accesses channel resource.
The random access channel resource that each handover candidate cells are communication terminal distribution is received, and to the communication eventually End is sent.
Present embodiment, can be before communication terminal terminates the communication with serving cell, for communication eventually by minizone cooperation End obtains the random access channel resource needed for Stochastic accessing Target cell.
For channel resources request module 900, minizone cooperation includes close coupling collaboration mode and no tight coupling cooperation mould Formula.
In one embodiment, in addition to trigger module, it is used for：
Radio link quality detection is carried out to the link of the communication terminal to the serving cell.
If the measured value of the radio link quality detection is less than link quality threshold, channel resources request module is triggered 900 initiate minizone cooperation, and ask the communication terminal to be connect to the random of each handover candidate cells to each handover candidate cells Enter channel resource.
Referring to Fig. 8, Fig. 8 is the flow signal of the embodiment of cell switching method the 5th in the communication system of the present invention Figure.
Cell switching method in the communication system of present embodiment is applied to collaboration mode as the small of no tight coupling Area, terminal access service cell, establish and be wirelessly transferred connection carrying user service data, handover candidate cells include adjacent area A1 and adjacent area B1, specifically may include following steps：
Step 801a and step 801b, serving cell are initiated minizone cooperation, arrived to adjacent area A1 and adjacent area B1 requesting terminals The random access channel resource of adjacent area.
Step 802a receives serving cell request with step 802b, adjacent area A1 and adjacent area B1, and respectively terminal distribution is random Access channel resource.
Step 803a returns to allocation result with step 803b, adjacent area A1 and adjacent area B1.
Step 804, serving cell issues neighbor cell configuration metrical information includes neighbour to terminal, the neighbor cell configuration metrical information Area A1 and B1 relevant information, the random access channel resource of adjacent area A1 and B1 distribution, measurement time slot configuration and serving cell It is no tight coupling collaboration mode with adjacent area A1 and B1.
Step 805, terminal returns to confirmation message after neighbor cell configuration metrical information is properly received.
Step 806, terminal is in the measurement time slot that serving cell provides, and interrupts with the wireless connection of serving cell and according to this Down-going synchronous is established with adjacent area A1 and B1.
Step 807a and step 807b, terminal send random in the adjacent area A1 and adjacent area B1 RACHs distributed respectively Access synchronizing symbol.
Step 808, terminal is in the wireless connection of non-measured time slot recovery and serving cell, normal transmission customer service number According to.
Step 809, terminal is interrupted with the wireless connection of serving cell simultaneously in another measurement time slot that serving cell provides According to this down-going synchronous is established with adjacent area A1 and B1.
Step 810a and step 810b, adjacent area A1 and B1 are suitable according to the Stochastic accessing synchronizing symbol detected, generation Uplink synchronous configuration information, sent by accidental access response message to terminal.
Step 811, terminal is in the wireless connection of non-measured time slot recovery and serving cell, normal transmission customer service number According to.
Step 812, after terminal completes adjacent area A1 and B1 radio link quality measurement, by the neighbour of coincidence measurement report condition The information reportings such as area's mark, wireless signal measurements are to serving cell.
Step 813, the nearby region measurement report result of serving cell comprehensive analysis terminal, and the Stochastic accessing that adjacent area returns Response message, determine switching target small area, it is herein assumed that be adjacent area A1.
Step 814, serving cell (serving cell switched) initiates to switch to adjacent area A1 (Target cell switched) Preparation request, including terminal related context information, such as terminal iidentification, carrying and operation quality requirement are wirelessly transferred, It may also include radio transmission time delay of the terminal in serving cell and the synchronous configuration information in Target cell.
Step 815, Target cell A1 determines that the handover request can be received according to own resource service condition.
Step 816, Target cell A1 sends switching request acknowledgement message to serving cell, including terminal mobility control Information processed, it is the up-downgoing signaling of terminal distribution and the Radio Resource of data transfer according to synchronous configuration information, and license is eventually End starts the time point being wirelessly transferred with receiving.
Step 817, serving cell sends switching command to terminal, wherein carrying the terminal mobility of Target cell return Control information, wireless resource scheduling information and it is wirelessly transferred with receiving the information such as time point.
Step 818, after terminal is properly received switching command, stop the transmission of control signaling and user service data, disconnect With the wireless connection of serving cell.
Step 819, terminal realizes the down-going synchronous with Target cell, and then at the appointed time point startup is wirelessly transferred and connect Receive, including terminal is sent to the switching completion control signaling of Target cell, and the user service data receipts between Target cell Hair.
The handover delay of present embodiment is the service terminal time shown in the drawings, including step 818 is to the place of step 819 Manage the time.
Referring to Fig. 9, Fig. 9 is the flow signal of the embodiment of cell switching method the 6th in the communication system of the present invention Figure.
Cell switching method in the communication system of present embodiment is tightly coupled cell suitable for collaboration mode, Terminal access service cell, establish and be wirelessly transferred connection carrying user service data, handover candidate cells include adjacent area A2 With adjacent area B2, it specifically may include following steps：
Step 901a and step 901b, serving cell are initiated minizone cooperation, arrived to adjacent area A2 and adjacent area B2 requesting terminals The noncompetitive random access channel resource of adjacent area.
Step 902a receives serving cell request with step 902b, adjacent area A2 and adjacent area B2, and respectively terminal distribution is non-competing Striving property random access channel resource.
Step 903a returns to allocation result with step 903b, adjacent area A2 and adjacent area B2.
Step 904：Serving cell issues neighbor cell configuration metrical information includes neighbour to terminal, the neighbor cell configuration metrical information Area A1 and B1 relevant information, the noncompetitive random access channel resource of adjacent area A2 and B2 distribution, measurement time slot configuration and Serving cell will use close coupling collaboration mode with adjacent area A2 and B2.
Step 905, terminal returns to confirmation message after neighbor cell configuration metrical information is properly received.
Step 906, terminal is in the measurement time slot that serving cell provides, and interrupts with the wireless connection of serving cell and according to this Down-going synchronous is established with adjacent area A2 and B2.
Step 907a and step 907b, the noncompetitive RACH that terminal is distributed in adjacent area A2 and adjacent area B2 respectively Send noncompetitive Stochastic accessing synchronizing symbol.
Step 908, terminal is in the wireless connection of non-measured time slot recovery and serving cell, normal transmission customer service number According to.
The spy that step 909a and step 909b, adjacent area A2 and B2 accord with according to the noncompetitive random access guiding detected Sign, generates suitable uplink synchronous configuration information, the serving cell of terminal is sent to by accidental access response message.
Step 910, after terminal completes adjacent area A2 and B2 radio link quality measurement, by the neighbour of coincidence measurement report condition The information reportings such as area's mark, wireless signal measurements are to serving cell.
Step 911, the nearby region measurement report result of serving cell comprehensive analysis terminal, and the Stochastic accessing that adjacent area returns Response message, determine Target cell, it is herein assumed that be adjacent area A2.
Step 912, serving cell initiates handover preparation request to adjacent area A2, including terminal related context information, Such as terminal iidentification, carrying and operation quality requirement are wirelessly transferred, in addition to the terminal is in the radio transmission time delay of serving cell And the synchronous configuration information in Target cell.
Step 913, Target cell A2 determines that the handover request can be received according to own resource service condition.
Step 914, Target cell A2 sends switching request acknowledgement message to serving cell, including terminal mobility control Information processed, it is the up-downgoing signaling of terminal distribution and the Radio Resource of data transfer according to synchronous configuration information, and license is eventually End starts the time point being wirelessly transferred with receiving.
Step 915, serving cell sends switching command to terminal.
Step 916, after terminal is properly received switching command, stop the transmission of control signaling and user service data, disconnect With the wireless connection of serving cell.
Step 917, terminal realizes the down-going synchronous with Target cell, and then at the appointed time point startup is wirelessly transferred and connect Receive, including terminal is sent to the switching completion control signaling of Target cell, and the user service data receipts between Target cell Hair.
The handover delay of present embodiment is the service terminal time shown in the drawings, including step 916 is to the place of step 917 Manage the time.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (19)

1. the cell switching method in a kind of communication system, it is characterised in that comprise the following steps：
Communication terminal is received to the random access channel resource of each handover candidate cells；
Stochastic accessing synchronizing symbol is sent to each handover candidate cells by the random access channel resource in measurement time slot；
Switching command is received, the switching command is according to the Target cell of uplink synchronous configuration request including serving cell The wireless resource scheduling information of communication terminal distribution, the Target cell are one in handover candidate cells, it is described on Response message of the synchronous configuration information of row for the Target cell to the Stochastic accessing synchronizing symbol；Wherein, serving cell is The communication cell of signaling and data transfer is currently carried out between communication terminal；
The switching command is responded, is switched the communication terminal from the serving cell according to the wireless resource scheduling information To the Target cell.
2. the cell switching method in communication system according to claim 1, it is characterised in that pass through in measurement time slot The step of random access channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells is further comprising the steps of：
Stochastic accessing synchronization is sent to each handover candidate cells by the random access channel resource in first group of measurement time slot Symbol；
Measurement time slot after first group of measurement time slot receives each handover candidate cells and responds the Stochastic accessing synchronization The uplink synchronous configuration information of symbol generation；
The uplink synchronous configuration information of each handover candidate cells response is sent to the serving cell.
3. the cell switching method in communication system according to claim 1, it is characterised in that pass through in measurement time slot The step of random access channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells is further comprising the steps of：
The downstream wireless signals of each handover candidate cells are received in second group of measurement time slot；
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, the nothing Wired link quality measurement reports include the radio link quality parameter between communication terminal and corresponding handover candidate cells；
The radio link quality measurement report is sent to the serving cell.
4. the cell switching method in communication system according to claim 1, it is characterised in that pass through in measurement time slot The step of random access channel resource sends Stochastic accessing synchronizing symbol to each handover candidate cells is further comprising the steps of：
Receive the downstream wireless signals of each handover candidate cells；
According to the downstream wireless signals, the radio link quality measurement report of the corresponding each handover candidate cells of generation, the nothing Wired link quality measurement reports include the radio link quality parameter between communication terminal and corresponding handover candidate cells；
The uplink synchronous of each handover candidate cells response Stochastic accessing synchronizing symbol generation is received in the 3rd group of measurement time slot Configuration information；
The uplink synchronous configuration information is loaded into the radio link quality measurement report；
The radio link quality measurement report is sent to the serving cell.
5. the cell switching method in communication system according to claim 1, it is characterised in that the handover candidate cells It is same cell with the serving cell.
6. the cell switching method in communication system according to claim 1, it is characterised in that the RACH Resource includes noncompetitive random access resource.
7. the cell switching method in communication system as claimed in any of claims 1 to 6, it is characterised in that institute Stating measurement time slot includes the wireless measurement time slot set by the serving cell.
A kind of 8. cell handover system in communication system, it is characterised in that including：
Channel resource receiving module, for receiving communication terminal to the random access channel resource of each handover candidate cells；
Stochastic accessing module, for being sent in measurement time slot by the random access channel resource to each handover candidate cells Stochastic accessing synchronizing symbol；
Command reception module, for receiving switching command, the switching command matches somebody with somebody confidence including serving cell according to uplink synchronous The Target cell of breath request is the wireless resource scheduling information of communication terminal distribution, and the Target cell is that handoff candidate is small One in area, the uplink synchronous configuration information is that response of the Target cell to the Stochastic accessing synchronizing symbol disappears Breath；Wherein, serving cell is the currently communication cell of progress signaling and data transfer between communication terminal；
Handover module, for responding the switching command, according to the wireless resource scheduling information by the communication terminal from institute State serving cell and be switched to the Target cell.
9. the cell handover system in communication system according to claim 8, it is characterised in that the Stochastic accessing module It is additionally operable to：
Stochastic accessing synchronization is sent to each handover candidate cells by the random access channel resource in first group of measurement time slot Symbol；
Measurement time slot after first group of measurement time slot receives each handover candidate cells and responds the Stochastic accessing synchronization The uplink synchronous configuration information of symbol generation；
The uplink synchronous configuration information of each handover candidate cells response is sent to the serving cell.
10. the cell switching method in a kind of communication system, it is characterised in that comprise the following steps：
Receive the uplink synchronous configuration information of each handover candidate cells response Stochastic accessing synchronizing symbol generation, wherein, it is described with Machine access synchronizing symbol is sent in measurement time slot from communication terminal by random access channel resource to each handover candidate cells；
Handover request is sent to Target cell, the Target cell is one in each handover candidate cells, the handover request The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation is responded including the Target cell；
Receive the Target cell and respond the wireless resource scheduling information that the handover request distributes to the communication terminal；
Switching command is sent to the communication terminal, the communication terminal is switched to the Target cell, institute from serving cell Stating switching command includes the wireless resource scheduling information；Wherein, serving cell for currently between communication terminal carry out signaling and The communication cell of data transfer.
11. the cell switching method in communication system according to claim 10, it is characterised in that respectively cut in the reception Before the step of changing the uplink synchronous configuration information of candidate cell response Stochastic accessing synchronizing symbol generation, in addition to following step Suddenly：
Minizone cooperation is initiated, and asks the communication terminal to be connect to the random of each handover candidate cells to each handover candidate cells Enter channel resource；
The random access channel resource that each handover candidate cells are communication terminal distribution is received, and is sent out to the communication terminal Send.
12. the cell switching method in communication system according to claim 11, it is characterised in that initiating minizone association Make, and to each handover candidate cells ask the communication terminal to each handover candidate cells random access channel resource the step of Before, it is further comprising the steps of：
Radio link quality detection is carried out to the link of the communication terminal to the serving cell；
If the measured value of radio link quality detection be less than link quality threshold, initiate minizone and cooperate, and to respectively cutting Change the random access channel resource that candidate cell asks the communication terminal to each handover candidate cells.
13. the cell switching method in communication system according to claim 10, it is characterised in that sent out to Target cell It is further comprising the steps of before the step of sending handover request：
The radio link quality measurement report of corresponding each handover candidate cells is received, the radio link quality measurement report includes Radio link quality parameter between communication terminal and corresponding handover candidate cells；
The radio link quality parameter is read from the radio link quality measurement report in corresponding each handover candidate cells；
The radio link quality parameter read according to corresponding each handover candidate cells, selectes the radio chains between the communication terminal Road quality meets that the handover candidate cells of default communication condition are Target cell.
14. the cell switching method in communication system according to claim 10, it is characterised in that receive each handoff candidate The step of uplink synchronous configuration information of cell response Stochastic accessing synchronizing symbol generation, comprises the following steps：
Receive each candidate cell and respond the response message that the Stochastic accessing synchronizing symbol is sent, read from the response message Handover candidate cells respond the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation；
Or,
The radio link quality measurement report of corresponding each handover candidate cells is received, handoff candidate is read from the response message Cell responds the uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation, the radio link quality measurement report bag Include the radio link quality parameter between communication terminal and corresponding handover candidate cells and handover candidate cells response described connects at random Enter the uplink synchronous configuration information of synchronizing symbol generation.
15. the cell switching method in communication system according to any one in claim 10 to 14, it is characterised in that The step of sending handover request to the Target cell comprises the following steps：
By the communication terminal respectively in the radio transmission time delay of the serving cell and the Target cell, the communication terminal Contextual information in terminal iidentification, be wirelessly transferred carrying information and operation quality requirement and the Target cell response The uplink synchronous configuration information of the Stochastic accessing synchronizing symbol generation, is loaded into the handover request；
The handover request is sent to the Target cell；
The wireless resource scheduling information for receiving the Target cell response handover request and distributing to the communication terminal The step of comprise the following steps：
Receive the Target cell and respond the wireless resource scheduling information that the handover request distributes to the communication terminal, it is described Wireless resource scheduling information include the Target cell distribute to the up-downgoing signaling of the communication terminal, data transfer it is wireless Resource and the license communication terminal start the temporal information of wireless output and wireless receiving.
16. the cell switching method in communication system according to claim 15, it is characterised in that the communication terminal opens The temporal information of dynamic wireless output and wireless receiving correspond to Intra-cell processing delay, inter-cell communication radio transmission time delay, Communication terminal serving cell radio transmission time delay communication terminal inter-process time delay and communication terminal between Target cell Radio transmission time delay.
A kind of 17. cell handover system in communication system, it is characterised in that including：
Synchronizing information receiving module, for receiving the uplink synchronous of each handover candidate cells response Stochastic accessing synchronizing symbol generation Configuration information, wherein, the Stochastic accessing synchronizing symbol passes through random access channel resource by communication terminal in measurement time slot Sent to each handover candidate cells；
Handover request module, for sending handover request to Target cell, the Target cell is in each handover candidate cells One, the uplink synchronous that the handover request includes the Target cell response Stochastic accessing synchronizing symbol generation matches somebody with somebody confidence Breath；
Schedule information receiving module, the communication terminal is distributed to for receiving the Target cell response handover request Wireless resource scheduling information；
Switching command sending module, for sending switching command to the communication terminal, make the communication terminal from serving cell The Target cell is switched to, the switching command includes the wireless resource scheduling information；Wherein, serving cell for currently with The communication cell of signaling and data transfer is carried out between communication terminal.
18. the cell handover system in communication system according to claim 17, it is characterised in that also including Target cell Chosen module, it is used for：
The radio link quality measurement report of corresponding each handover candidate cells is received, the radio link quality measurement report includes Radio link quality obtained by carrying out radio link quality measurement to handover candidate cells as the random access channel resource Parameter；
The radio link quality parameter is read from the radio link quality measurement report in corresponding each handover candidate cells；
The radio link quality parameter read according to corresponding each handover candidate cells, the communication selected between the communication terminal are believed Number quality meets that preparatory condition handover candidate cells are Target cell.
19. the cell handover system in communication system according to claim 17 or 18, it is characterised in that also including channel Resource request module, the communication terminal is asked to be waited to each switching for initiating minizone cooperation, and to each handover candidate cells Select the random access channel resource of cell；Receive RACH money of each handover candidate cells for communication terminal distribution Source, and sent to the communication terminal.
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