CN104202779A

CN104202779A - Cell switching method and system for communication system

Info

Publication number: CN104202779A
Application number: CN201410453912.4A
Authority: CN
Inventors: 刘为
Original assignee: CETC 7 Research Institute
Current assignee: CETC 7 Research Institute
Priority date: 2014-09-05
Filing date: 2014-09-05
Publication date: 2014-12-10
Anticipated expiration: 2034-09-05
Also published as: CN104202779B

Abstract

The invention discloses a cell switching method and system for a communication system. The method comprises the following steps: receiving a random access channel resource from a communication terminal to each switching cell candidate; ending a random access synchronizing symbol to each switching cell candidate through the random access channel resource within a measurement time slot; receiving a switching command; responding to the switching command; switching a communication terminal from a service cell to a target cell according to the wireless resource scheduling information. With the adoption of the method and system, the service interruption time caused by switching the service cell can be decreased, and the communication service quality and user experience can be improved.

Description

Cell switching method in communication system and system

Technical field

The present invention relates to communication technical field, particularly relate to cell switching method and system in a kind of communication system.

Background technology

In satellite mobile communication system, ground communication terminal is linked into mobile communication system via satellite.Satellite equipments has wave beam forming network, can form up to a hundred extremely narrow beam projections to earth surface, and the corresponding mobile communication system Yi Ge of each wave beam community, on average covers 400～500km scope, forms multi-beam networking.

In satellite mobile communication system, when wireless link connection (Radio Link) communication terminal in activated state moves to the coverage of another wave beam from a wave beam, satellite mobile communication system need to complete minizone and switch (Inter-cell Handover), to ensure that the wireless link of communication terminal connects and the continuity of business.

But radio signal propagation time delay is far above the signal transmission delay in land mobile communication system in satellite mobile communication system, community easily causes communication service to be interrupted for a long time while switching, obviously reduces telecommunication service quality.

Summary of the invention

Based on this, be necessary for radio signal propagation time delay in above-mentioned satellite mobile communication system large, switch easily cause communication service to interrupt for a long time, reduce the problem of telecommunication service quality, cell switching method and system in a kind of communication system are provided.

A cell switching method in communication system, comprises the following steps:

Received communication terminal is to the random access channel resource of each handover candidate cells;

In measurement time slot, by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol;

Receive switching command, described switching command comprises that Serving cell is the wireless resource scheduling information that described communication terminal distributes according to the Target cell of uplink synchronous configuration request, described Target cell is in handover candidate cells, and described uplink synchronous configuration information is the response message of described Target cell to described random access synchronizing symbol;

Respond described switching command, according to described wireless resource scheduling information, described communication terminal is switched to described Target cell from described Serving cell.

A kind of communication system Zhong community switched system, comprising:

Channel resource receiver module, the random access channel resource for received communication terminal to each handover candidate cells;

Random access module, for sending random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot;

Command reception module, be used for receiving switching command, described switching command comprises that Serving cell is the wireless resource scheduling information that described communication terminal distributes according to the Target cell of uplink synchronous configuration request, described Target cell is in handover candidate cells, and described uplink synchronous configuration information is the response message of described Target cell to described random access synchronizing symbol;

Handover module, for responding described switching command, is switched to described Target cell by described communication terminal from described Serving cell according to described wireless resource scheduling information.

Cell switching method in above-mentioned communication system and system send random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot.Reception contains the switching command that Target cell is the wireless resource scheduling information of described communication terminal distribution, and responds described switching command, according to described wireless resource scheduling information, described communication terminal is switched to described Target cell from described Serving cell.Can be disconnecting with before being connected of Serving cell switches, acquisition is switched to the required wireless resource scheduling information in Target cell, without receiving after switching command to the random access of Target cell initiation, service outage duration due to can greatly reduce handed over service district time, improves telecommunication service quality and user and experiences.

A cell switching method in communication system, comprises the following steps:

Receive the uplink synchronous configuration information that the random access of each handover candidate cells response synchronizing symbol generates, wherein, described random access synchronizing symbol is sent to each handover candidate cells by random access channel resource in measurement time slot by communication terminal;

Send handover request to Target cell, in Wei Ge handover candidate cells, described Target cell one, described handover request comprises the uplink synchronous configuration information that response described random access synchronizing symbol in described Target cell generates;

Receive described Target cell and respond described handover request, distribute to the wireless resource scheduling information of described communication terminal;

Send switching command to described communication terminal, make described communication terminal be switched to described Target cell from Serving cell, described switching command comprises described wireless resource scheduling information.

A kind of communication system Zhong community switched system, comprising:

Synchronizing information receiver module, with the uplink synchronous configuration information that receives the generation of the random access of each handover candidate cells response synchronizing symbol, wherein, described random access synchronizing symbol is sent to each handover candidate cells by random access channel resource in measurement time slot by communication terminal;

Handover request module, for send handover request to Target cell, in Wei Ge handover candidate cells, described Target cell one, described handover request comprises the uplink synchronous configuration information that response described random access synchronizing symbol in described Target cell generates;

Schedule information receiver module, responds described handover request and distributes to the wireless resource scheduling information of described communication terminal for receiving described Target cell;

Switching command sending module, for sending switching command to described communication terminal, makes described communication terminal be switched to described Target cell from Serving cell, and described switching command comprises described wireless resource scheduling information.

Cell switching method in above-mentioned communication system and system, the uplink synchronous configuration information that the random access synchronizing symbol of based target community responding communication terminal generates sends handover request to Target cell, and then obtain Target cell and distribute to the wireless resource scheduling information of described communication terminal, and send to described communication terminal with switching command, make described communication terminal can obtain the required described wireless resource scheduling information in described Target cell that is switched to disconnecting with before being connected of Serving cell.And then described communication terminal is being received after switching command without to Target cell initiating random access procedure, can reduce handed over service district time due to service outage duration, improve telecommunication service quality and user and experience.

Brief description of the drawings

Fig. 1 is the schematic flow sheet of cell switching method the first execution mode in communication system of the present invention;

Fig. 2 is the schematic flow sheet of cell switching method the second execution mode in communication system of the present invention;

Fig. 3 is the structural representation of communication system Zhong of the present invention community switched system the first execution mode;

Fig. 4 is the schematic flow sheet of cell switching method the 3rd execution mode in communication system of the present invention;

Fig. 5 is the schematic flow sheet of cell switching method the 4th execution mode in communication system of the present invention;

Fig. 6 is the structural representation of communication system Zhong of the present invention community switched system the 3rd execution mode;

Fig. 7 is the structural representation of communication system Zhong of the present invention community switched system the 4th execution mode;

Fig. 8 is the schematic flow sheet of cell switching method the 5th execution mode in communication system of the present invention;

Fig. 9 is the schematic flow sheet of cell switching method the 6th execution mode in communication system of the present invention.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

Refer to Fig. 1, Fig. 1 is the schematic flow sheet of cell switching method the first execution mode in communication system of the present invention.

Cell switching method in the described communication system of present embodiment, is preferably the operation of communication terminal side, can comprise the following steps:

Step S101, received communication terminal is to the random access channel resource of each handover candidate cells.

Step S102 sends random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot.

Step S103, receive switching command, described switching command comprises that Serving cell is the wireless resource scheduling information that described communication terminal distributes according to the Target cell of uplink synchronous configuration request, described Target cell is in handover candidate cells, and described uplink synchronous configuration information is the response message of described Target cell to described random access synchronizing symbol.

Step S104, responds described switching command, according to described wireless resource scheduling information, described communication terminal is switched to described Target cell from described Serving cell.

Cell switching method in communication system described in present embodiment sends random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot.Reception contains the switching command that Target cell is the wireless resource scheduling information of described communication terminal distribution, and responds described switching command, according to described wireless resource scheduling information, described communication terminal is switched to described Target cell from described Serving cell.Can be disconnecting with before being connected of Serving cell switches, acquisition is switched to the required wireless resource scheduling information in Target cell, without receiving after switching command to the random access of Target cell initiation, service outage duration due to can reduce handed over service district time, improves telecommunication service quality and user and experiences.

Wherein, for step S101, preferably, Serving cell is the communication cell of carrying out signaling and transfer of data between current and communication terminal.Handover candidate cells is neighbor cell.Communication terminal can be mobile terminal.Described random access channel resource preferably by described Serving cell keep be connected with communication terminal in, the minizone cooperating process based on Serving cell and handover candidate cells is to handover candidate cells request gained.In other embodiments, also can in measurement time slot, receive the system broadcast information of each handover candidate cells by communication terminal, and then from described system broadcast information, read the configuration information of described random access channel resource.

Further, described random access channel resource can comprise noncompetitive random access resource.Also can comprise competitive random access resource.Described noncompetitive random access resource can be one or one group of accidental access signal, as the ZC sequence that LTE adopted, and the sequential transmitting and frequency domain side-play amount.

In one embodiment, arrive the step of random access channel resource of each handover candidate cells in described received communication terminal before, also can comprise the following steps:

Radio link quality measurement is carried out to the link of communication terminal in Serving cell.

If the measured value that described radio link quality is measured is lower than link-quality threshold value, notification service community is the random access channel resource of described communication terminal request to handover candidate cells.

The present embodiment, the link-quality that can arrive communication terminal amount in Serving cell is lower than link-quality threshold value, and notification service community is the random access channel resource of described communication terminal request to handover candidate cells, switches and does early-stage preparations for community.

Preferably, described link-quality threshold value can be cell signal receiving intensity threshold value, cell reference signals intensity threshold, cell reference signals quality threshold or cell signal interference ratio threshold value etc.

In another embodiment, can receive the cell measurement configuration information that Serving cell sends, from described cell measurement configuration information, read described random access channel resource.Described cell measurement configuration information can comprise the relevant information of handover candidate cells, random access channel resource that communication terminal is distributed in handover candidate cells, measure the collaboration mode (close coupling or no tight coupling) between time slot configuration and Serving cell and handover candidate cells.

For step S102, described measurement time slot can be the set wireless measurement time slot of wireless transmission schedule gaps or described Serving cell of described communication terminal.The message that communication terminal can send from Dedicated Control Channel by Serving cell obtains the time slot configuration information of corresponding described measurement time slot.

Further, measuring the initial time communication terminal disconnection of time slot and being connected of Serving cell, reach down-going synchronous with each handover candidate cells, then initiate radio link quality measurement and send the random synchronizing symbol that accesses by described random access channel resource.Also can read the system broadcast information of each handover candidate cells.In the termination time of described measurement time slot, communication terminal recovery is connected with Serving cell.

Further, in same measurement time slot or different measuring time slot, communication terminal can carry out to multiple handover candidate cells the radio link quality measurement of serial or parallel.

In one embodiment, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in measurement time slot is further comprising the steps of:

Receive the downstream wireless signals of each handover candidate cells at second group of measurement time slot.

According to described downstream wireless signals, generate the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises corresponding radio link quality parameter.

Send described radio link quality measurement report to described Serving cell.

The present embodiment, carries out radio link quality measurement measuring each handover candidate cells in time slot, can be from handover candidate cells, to choose Target cell basis for selecting is provided.

Preferably, the downstream wireless signals that can both receive each handover candidate cells in same measurement time slot is carried out radio link quality measurement to each handover candidate cells, sends again random access synchronizing symbol to each handover candidate cells.The downstream wireless signals that also can receive each handover candidate cells in different time-gap is carried out radio link quality measurement to each handover candidate cells, sends random access synchronizing symbol to each handover candidate cells.

The downstream wireless signals that further, can simultaneously receive each handover candidate cells in same measurement time slot is carried out radio link quality measurement to each handover candidate cells.The downstream wireless signals that also can receive each handover candidate cells at different measuring time slot is carried out radio link quality measurement to each handover candidate cells.Between different measuring time slot, there is default time delay.Described default time delay and described measurement time slot can be set by Serving cell, and inform communication terminal by Serving cell by Dedicated Control Channel message.

Further, for LTE technology, when identical networking, communication terminal carries out radio link quality measurement to each handover candidate cells keeping not needing in communicating by letter measuring with Serving cell the downstream wireless signals that time slot can receive each handover candidate cells, when inter-frequency networking, communication terminal need to be measured the downstream wireless signals that time slot could receive each handover candidate cells radio link quality measurement is carried out in each handover candidate cells.

In another embodiment, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in measurement time slot is further comprising the steps of:

Receive the downstream wireless signals of each handover candidate cells.

According to described downstream wireless signals, generate the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises the radio link quality parameter between communication terminal and corresponding handover candidate cells.

Measure time slot at the 3rd group and receive the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates.

Described uplink synchronous configuration information is loaded in described radio link quality measurement report.

Send described radio link quality measurement report to described Serving cell.

The present embodiment, is loaded into described uplink synchronous configuration information in described radio link quality measurement report.Send described radio link quality measurement report to described Serving cell.

Preferably, described radio link quality parameter comprises that community received signal strength, signal-to-jamming ratio etc. are for characterizing the parameter of link-quality of communication terminal and handover candidate cells.

Further, can in same measurement time slot, receive the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates, also can in different measuring time slot, receive the uplink synchronous configuration information that response described random access synchronizing symbol in different handover candidate cells generates.

For step S103, described switching command preferably can comprise mobility control information, the wireless resource scheduling information of communication terminal, and described wireless resource scheduling information can comprise that described Target cell distributes to the Radio Resource of the up-downgoing signaling of described communication terminal, transfer of data and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

Further, described uplink synchronous configuration information can comprise Domain Synchronous Configuration Values, the synchronous Configuration Values of frequency domain and uplink transmission power level.Further, described Target cell can be chosen by communication terminal from handover candidate cells, also can from handover candidate cells, be chosen by Serving cell.Basis for selecting can be the link quality parameter of communication terminal and handover candidate cells, also can be the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.Also can be usual other parameters of those skilled in the art.

For step S104, described handover candidate cells and described Serving cell also can belong to different communication cells, to realize the switching of communication terminal between different districts.Described handover candidate cells and described Serving cell can be same community, to realize the switching of communication terminal in community.

In one embodiment, receiving after described switching command, communication terminal can disconnect the wireless connections with Serving cell immediately, the wireless connections according to described wireless resource scheduling information foundation with Target cell.Reach with after the down-going synchronous of Target cell can with described wireless resource scheduling information in the described communication terminal of license start the wireless output time point corresponding with the temporal information of reception and start wireless transmission and reception, without triggering uplink synchronous process.

Communication system in present embodiment is preferably satellite mobile communication system, and method of the present invention can be reduced to 5.5ms by handover delay in satellite mobile communication system.

In other embodiments, the inventive method also can be applicable to this area other there is the mobile communication system of long delay channel characteristics, to reduce handover delay, improve communication quality.

Refer to Fig. 2, Fig. 2 is the schematic flow sheet of cell switching method the second execution mode in communication system of the present invention.

Cell switching method in the described communication system of present embodiment and the difference of the first execution mode are: measuring, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in time slot is further comprising the steps of:

Step S201, measures time slot at first group, by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol.

Step S202, the measurement time slot after described first group is measured time slot receives the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates.

Step S203, sends the uplink synchronous configuration information that each handover candidate cells responds to described Serving cell.

Present embodiment, being applicable to cooperation mode is the community of no tight coupling collaboration mode.

Wherein, for step S201, the downstream wireless signals that also can receive each handover candidate cells at described first group of measurement time slot is carried out radio link quality measurement to each handover candidate cells.Described first group of measurement time slot can be one and measures time slot, each handover candidate cells sent to random access synchronizing symbol by described random access channel resource simultaneously.Described first group of measurement time slot can comprise multiple measurement time slots, by described random access channel resource, each handover candidate cells sent to the random synchronizing symbol that accesses at the described first group different measuring time slot of measuring time slot.

For step S202, preferably, measure the uplink synchronous configuration information that receives response described random access synchronizing symbol generation in each handover candidate cells in time slot for one that can in the time measuring default after time slot for described first group, delay.Described default time delay can be set or be set by communication terminal by Serving cell.

For step S203, described uplink synchronous configuration information can be loaded into sending to described Serving cell in the radio link quality measurement report of each handover candidate cells.

Refer to Fig. 3, Fig. 3 is the structural representation of communication system Zhong of the present invention community switched system the first execution mode.

The described communication system Zhong community switched system of present embodiment is preferably installed in communication terminal, can comprise channel resource receiver module 100, random access module 200, command reception module 300 and handover module 400, wherein:

Channel resource receiver module 100, the random access channel resource for received communication terminal to each handover candidate cells.

Random access module 200, for sending random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot.

Command reception module 300, be used for receiving switching command, described switching command comprises that Serving cell is the wireless resource scheduling information that described communication terminal distributes according to the Target cell of uplink synchronous configuration request, described Target cell is in handover candidate cells, and described uplink synchronous configuration information is the response message of described Target cell to described random access synchronizing symbol.

Handover module 400, for responding described switching command, is switched to described Target cell by described communication terminal from described Serving cell according to described wireless resource scheduling information.

Communication system Zhong community switched system described in present embodiment sends random access synchronizing symbol by described random access channel resource to each handover candidate cells in measurement time slot.Reception contains the switching command that Target cell is the wireless resource scheduling information of described communication terminal distribution, and responds described switching command, according to described wireless resource scheduling information, described communication terminal is switched to described Target cell from described Serving cell.Can disconnect with before being connected of Serving cell switches, acquisition is switched to the required wireless resource scheduling information in Target cell, without receiving after switching command to the random access of Target cell initiation, service outage duration due to can reduce handed over service district time, improves telecommunication service quality and user and experiences.

Wherein, for channel resource receiver module 100, preferably, Serving cell is the communication cell of carrying out signaling and transfer of data between current and communication terminal.Handover candidate cells is neighbor cell.Communication terminal can be mobile terminal.Described random access channel resource preferably by described Serving cell keep be connected with communication terminal in, the minizone cooperating process based on Serving cell and handover candidate cells is to handover candidate cells request gained.In other embodiments, also can in measurement time slot, receive the system broadcast information of each handover candidate cells by communication terminal, and then from described system broadcast information, read described random access channel resource.

For random access module 200, described measurement time slot can be the set wireless measurement time slot of wireless transmission schedule gaps or described Serving cell of described communication terminal.The message that communication terminal can send from Dedicated Control Channel by Serving cell obtains the time slot configuration information of corresponding described measurement time slot.

In one embodiment, random access module 200 can be used for:

Send described radio link quality measurement report to described Serving cell.

The downstream wireless signals that further, can simultaneously receive each handover candidate cells in same measurement time slot is carried out radio link quality measurement to each handover candidate cells.Also the downstream wireless signals that can different measuring time slot receives each handover candidate cells is carried out radio link quality measurement to each handover candidate cells.Between different measuring time slot, there is default time delay.Described default time delay and described measurement time slot can be set by Serving cell, and inform communication terminal by Serving cell by Dedicated Control Channel message.

Further, for LTE technology, when identical networking, communication terminal carries out radio link quality measurement to each handover candidate cells keeping not needing in communicating by letter measuring with Serving cell the downstream wireless signals that time slot can receive each handover candidate cells, when inter-frequency networking, communication terminal needs to measure the downstream wireless signals that time slot could receive each handover candidate cells radio link quality measurement is carried out in each handover candidate cells.

In another embodiment, random access module 200 also can be used for:

Receive the downstream wireless signals of each handover candidate cells.

Send described radio link quality measurement report to described Serving cell.

For command reception module 300, described switching command preferably can comprise mobility control information, the wireless resource scheduling information of communication terminal, and described wireless resource scheduling information can comprise that described Target cell distributes to the Radio Resource of the up-downgoing signaling of described communication terminal, transfer of data and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

For handover module 400, described handover candidate cells and described Serving cell also can belong to different communication cells, to realize the switching of communication terminal between different districts.Described handover candidate cells and described Serving cell can be same community, to realize the switching of communication terminal in community.

The following stated is communication system Zhong of the present invention community switched system the second execution mode.

The described communication system Zhong community switched system of present embodiment and the difference of the first execution mode are: random access module 200 also can be used for:

Measure time slot at first group, by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol.

Measurement time slot after described first group is measured time slot receives the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates.

Send the uplink synchronous configuration information of each handover candidate cells response to described Serving cell.

Wherein, for random access module 200, the downstream wireless signals that also can receive each handover candidate cells at described first group of measurement time slot is carried out radio link quality measurement to each handover candidate cells.Described first group of measurement time slot can be one and measures time slot, each handover candidate cells sent to random access synchronizing symbol by described random access channel resource simultaneously.Described first group of measurement time slot can comprise multiple measurement time slots, by described random access channel resource, each handover candidate cells sent to the random synchronizing symbol that accesses at the described first different measuring time slot of measuring.

Preferably, measure the uplink synchronous configuration information that receives response described random access synchronizing symbol generation in each handover candidate cells in time slot for one that in the time measuring default after time slot for described first group, delays.Described default time delay can be set or be set by communication terminal by Serving cell.

Further, described uplink synchronous configuration information can be loaded into sending to described Serving cell in the radio link quality measurement report of each handover candidate cells.

Refer to Fig. 4, Fig. 4 is the schematic flow sheet of cell switching method the 3rd execution mode in communication system of the present invention.

Cell switching method in the described communication system of present embodiment, is preferably the operation of Serving cell side, can comprise the following steps:

Step S401, receives the uplink synchronous configuration information that the random access of each handover candidate cells response synchronizing symbol generates, and wherein, described random access synchronizing symbol is sent to each handover candidate cells by random access channel resource in measurement time slot by communication terminal.

Step S402, sends handover request to Target cell, in Wei Ge handover candidate cells, described Target cell one, and described handover request comprises the uplink synchronous configuration information that response described random access synchronizing symbol in described Target cell generates.

Step S403, receives described Target cell and responds described handover request and distribute to the wireless resource scheduling information of described communication terminal.

Step S404, sends switching command to described communication terminal, makes described communication terminal be switched to described Target cell from Serving cell, and described switching command comprises described wireless resource scheduling information.

Cell switching method in communication system described in present embodiment, the uplink synchronous configuration information that the random access synchronizing symbol of based target community responding communication terminal generates sends handover request to Target cell, and then obtain Target cell and distribute to the wireless resource scheduling information of described communication terminal, and send to described communication terminal with switching command, make described communication terminal can obtain the required described wireless resource scheduling information in described Target cell that is switched to disconnecting with before being connected of Serving cell.And then make described communication terminal without initiating random access to Target cell receiving after switching command, can reduce handed over service district time due to service outage duration, improve telecommunication service quality and user and experience.

Wherein, for step S401, preferably, described uplink synchronous configuration information can comprise Domain Synchronous Configuration Values, the synchronous Configuration Values of frequency domain and uplink transmission power level.

Preferably, the described uplink synchronous configuration information can received communication terminal sending, also can receive the described uplink synchronous configuration information that each handover candidate cells sends.

In one embodiment, before the step of the uplink synchronous configuration information generating at the random access of described reception each handover candidate cells response synchronizing symbol, further comprising the steps of:

Obtaining communication terminal arrives the random access channel resource of each handover candidate cells, and sends to described communication terminal.

Preferably, the link-quality that can detect in Serving cell communication terminal up link is during lower than link-quality threshold value, or receive communication terminal send random access channel resource request time, described request can comprise for identification service district the information lower than link-quality threshold value to the link-quality of communication terminal, transfer the random access channel resource prestoring or initiate minizone cooperation, the random access channel resource to each handover candidate cells Real time request communication terminal to each handover candidate cells.

In another embodiment, the step that receives the uplink synchronous configuration information that the random access of each handover candidate cells response synchronizing symbol generates comprises the following steps:

Receive the response message that response described random access synchronizing symbol in each handover candidate cells sends, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.Or, receive the radio link quality measurement report of corresponding each handover candidate cells, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates, described radio link quality measurement report comprises the uplink synchronous configuration information that radio link quality parameter and the described random access synchronizing symbol of handover candidate cells response generate.

For step S402, described handover request preferably can comprise the contextual information of communication terminal, the uplink synchronous configuration information that communication terminal generates at radio transmission time delay, wireless transmission beared information and operation quality requirement and the described random access synchronizing symbol of described Target cell response of described Serving cell and described Target cell respectively.

Further, described Target cell can be chosen by communication terminal from handover candidate cells, also can from handover candidate cells, be chosen by Serving cell.Basis for selecting can be the radio link quality parameter between communication terminal and handover candidate cells, also can be the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.Also can be usual other parameters of those skilled in the art.

In one embodiment, comprise the following steps to the step of described Target cell transmission handover request:

By the described communication terminal uplink synchronous configuration information that the described random access synchronizing symbol of the terminal iidentification in the contextual information of the radio transmission time delay of described Serving cell and described Target cell, described communication terminal, wireless transmission beared information and operation quality requirement and described Target cell response generates respectively, be loaded in described handover request.

Send described handover request to described Target cell.

The described Target cell of described reception responds described handover request and distributes to the step of the wireless resource scheduling information of described communication terminal and comprise the following steps:

Receive the wireless resource scheduling information that described Target cell responds described handover request and distribute to described communication terminal, described wireless resource scheduling information comprises that described Target cell distributes to the Radio Resource of the up-downgoing signaling of described communication terminal, transfer of data and permit described communication terminal to start the temporal information of wireless output and reception.

The present embodiment, further strengthens the handover negotiation optimization of minizone.

Preferably, permit temporal information that described communication terminal starts wireless output and wireless receiving corresponding to community inter-process time delay, minizone communicate by letter radio transmission time delay, communication terminal at radio transmission time delay, communication terminal inter-process time delay and the communication terminal of Serving cell the radio transmission time delay between Target cell.

Further, Target cell can start by the described communication terminal of following formula estimation license the time point of wireless output and wireless receiving:

M＝T+t+X+Y+Z；

Wherein, M is communication overall delay, and T is community inter-process time delay, can be default fixed value; T is minizone communications time delay, can be default fixed value; X is the radio transmission time delay of communication terminal in Serving cell.Can be contained in Serving cell mails in the handover request of Target cell; Z is communication terminal intra-node processing delay, comprises resolving and carrying out switching command, be synchronized to the operation such as Target cell required time, can be default fixed value; Y is the wireless transmission time delay of communication terminal between Target cell, and the random access procedure that can initiate to Target cell by communication terminal records, and can be contained in Serving cell and mail in the handover request of Target cell.

Obtain the described communication terminal of corresponding license and start the time point of wireless output and wireless receiving according to the communication overall delay M of gained.

The described communication terminal respectively common capable of dynamic of the radio transmission time delay in described Serving cell and described Target cell changes, and the time point that therefore dynamic estimation permits described communication terminal to start wireless output and wireless receiving can further reduce time delay.Otherwise, just can only, according to the default larger value of the distribution situation of time delay value, adapt to various Delay Variation.In satellite communication system, adopt above-mentioned method for optimizing, the effect that reduces time delay is more obvious.

In another embodiment, before sending the step of handover request to Target cell, further comprising the steps of:

Receive the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises the radio link quality parameter between handover candidate cells and communication terminal.

Described radio link quality parameter is read from described radio link quality measurement report in corresponding each handover candidate cells.

The radio link quality parameter reading according to the each handover candidate cells of correspondence, it is Target cell that the radio link quality between selected and described communication terminal meets the handover candidate cells of presetting communication condition.

The present embodiment, by the radio link quality parameter of the each handover candidate cells of correspondence, the handover candidate cells that the radio link quality between selected and described communication terminal meets default communication condition is Target cell, can improve the communication quality after the switching of community.

Preferably, described default communication condition can be radio link quality between handover candidate cells and communication terminal higher than the radio link quality between Serving cell and communication terminal.

For step S403, preferably, described wireless resource scheduling information can comprise described Target cell distribute to according to described uplink synchronous configuration information described communication terminal up-downgoing signaling, transfer of data Radio Resource and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

In one embodiment, Target cell is receiving after described handover request, processing delay according to Serving cell, Target cell and communication terminal to switching related signaling, and Target cell and Serving cell wireless transmission time delay respectively and between communication terminal, calculate communication terminal and start the time point of wireless transmission and reception.

For step S404, described switching command preferably can comprise mobility control information, the wireless resource scheduling information of communication terminal, described wireless resource scheduling information can comprise described Target cell distribute to according to described uplink synchronous configuration information described communication terminal up-downgoing signaling, transfer of data Radio Resource and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

Refer to Fig. 5, Fig. 5 is the schematic flow sheet of cell switching method the 4th execution mode in communication system of the present invention.

Cell switching method in the described communication system of present embodiment and the difference of the 3rd execution mode are: before the step of the uplink synchronous configuration information generating at the random access of described reception each handover candidate cells response synchronizing symbol, further comprising the steps of:

Step S501, initiates minizone cooperation, and arrives the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells.

Step S502, receiving each handover candidate cells is the random access channel resource that described communication terminal distributes, and sends to described communication terminal.

Present embodiment, is cooperated and can be stopped with before the communicating by letter of Serving cell, for communication terminal obtains the required random access channel resource in random access Target cell at communication terminal by minizone.

Wherein, for step S501, minizone cooperation comprises close coupling collaboration mode and no tight coupling collaboration mode.

In one embodiment, initiating minizone cooperation, and arrive the step of random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells before, further comprising the steps of:

Described communication terminal is carried out to radio link quality detection to the link of described Serving cell.

If the measured value that described radio link quality detects lower than link-quality threshold value, is initiated minizone cooperation, and arrive the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells.

Refer to Fig. 6, Fig. 6 is the structural representation of communication system Zhong of the present invention community switched system the 3rd execution mode.

The described communication system Zhong community switched system of present embodiment, is preferably installed in Serving cell side, can comprise synchronizing information receiver module 500, handover request module 600, schedule information receiver module 700 and switching command sending module 800, wherein:

Synchronizing information receiver module 500, the uplink synchronous configuration information generating for receiving the random access of each handover candidate cells response synchronizing symbol, wherein, described random access synchronizing symbol is sent to each handover candidate cells by random access channel resource in measurement time slot by communication terminal.

Handover request module 600, for send handover request to Target cell, in Wei Ge handover candidate cells, described Target cell one, described handover request comprises the uplink synchronous configuration information that response described random access synchronizing symbol in described Target cell generates.

Schedule information receiver module 700, responds described handover request and distributes to the wireless resource scheduling information of described communication terminal for receiving described Target cell.

Switching command sending module 800, for sending switching command to described communication terminal, makes described communication terminal be switched to described Target cell from Serving cell, and described switching command comprises described wireless resource scheduling information.

Communication system Zhong community switched system described in present embodiment, the uplink synchronous configuration information that the random access synchronizing symbol of based target community responding communication terminal generates sends handover request to Target cell, and then obtain Target cell and distribute to the wireless resource scheduling information of described communication terminal, and send to described communication terminal with switching command, make described communication terminal can obtain the required described wireless resource scheduling information in described Target cell that is switched to disconnecting with before being connected of Serving cell.And then make described communication terminal without initiating random access to Target cell receiving after switching command, can reduce handed over service district time due to service outage duration, improve telecommunication service quality and user and experience.

Wherein, for synchronizing information receiver module 500, preferably, described uplink synchronous configuration information can comprise Domain Synchronous Configuration Values, the synchronous Configuration Values of frequency domain and uplink transmission power level.

In one embodiment, before the uplink synchronous configuration information that also can generate at the random access of reception each handover candidate cells response synchronizing symbol, obtaining communication terminal arrives the random access channel resource of each handover candidate cells, and sends to described communication terminal.

In another embodiment, synchronizing information receiver module 500 can be used for:

Receive the response message that response described random access synchronizing symbol in each handover candidate cells sends, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.Or, receive the radio link quality measurement report of corresponding each handover candidate cells, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates, described radio link quality measurement report comprises that by described random access channel resource, radio link quality being carried out in each handover candidate cells measures the radio link quality parameter of gained and the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.

For handover request module 600, described handover request preferably can comprise the contextual information of communication terminal, the uplink synchronous configuration information that communication terminal generates at radio transmission time delay, wireless transmission beared information and operation quality requirement and the described random access synchronizing symbol of described Target cell response of described Serving cell and described Target cell respectively.

Further, described Target cell can be chosen by communication terminal from handover candidate cells, also can from handover candidate cells, be chosen by Serving cell.Basis for selecting can be the link quality parameter of link between communication terminal and handover candidate cells, also can be the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates.Also can be usual other parameters of those skilled in the art.

In one embodiment, handover request module 600 also can be used for:

Send described handover request to described Target cell.

Preferably, permit temporal information that described communication terminal starts wireless output and wireless receiving corresponding to community inter-process time delay, minizone radio transmission time delay, communication terminal radio transmission time delay communication terminal inter-process time delay and the radio transmission time delay of communication terminal between Target cell in Serving cell of communicating by letter.

M＝T+t+X+Y+Z；

In another embodiment, also comprise Target cell chosen module, for:

For schedule information receiver module 700, preferably, described wireless resource scheduling information can comprise described Target cell distribute to according to described uplink synchronous configuration information described communication terminal up-downgoing signaling, transfer of data Radio Resource and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

For switching command sending module 800, described switching command preferably can comprise mobility control information, the wireless resource scheduling information of communication terminal, described wireless resource scheduling information can comprise described Target cell distribute to according to described uplink synchronous configuration information described communication terminal up-downgoing signaling, transfer of data Radio Resource and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

Refer to Fig. 7, Fig. 7 is the structural representation of communication system Zhong of the present invention community switched system the 4th execution mode.

The described communication system Zhong community switched system of present embodiment and the difference of the 3rd execution mode are: also comprise channel resource request module 900, for:

Initiation minizone cooperates, and arrives the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells.

Receiving each handover candidate cells is the random access channel resource that described communication terminal distributes, and sends to described communication terminal.

For channel resource request module 900, minizone cooperation comprises close coupling collaboration mode and no tight coupling collaboration mode.

In one embodiment, also comprise trigger module, for:

Initiate minizone cooperation if the measured value that described radio link quality detects lower than link-quality threshold value, triggers channel resource request module 900, and arrive the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells.

Refer to Fig. 8, Fig. 8 is the schematic flow sheet of cell switching method the 5th execution mode in communication system of the present invention.

Cell switching method in the described communication system of present embodiment is applicable to the community that collaboration mode is no tight coupling, terminal is access service community, set up wireless transmission and connected carrying user service data, handover candidate cells comprises adjacent area A1 and adjacent area B1, specifically can comprise the following steps:

Step 801a and step 801b, initiation minizone, Serving cell cooperation, to adjacent area A1 and B1 requesting terminal, adjacent area to the random access channel resource of adjacent area.

Step 802a and step 802b, adjacent area A1 and adjacent area B1 accept Serving cell request, are respectively terminal distribution random access channel resource.

Step 803a and step 803b, adjacent area A1 and adjacent area B1 return to allocation result.

Step 804, Serving cell issues neighbor cell configuration metrical information to terminal, and described neighbor cell configuration metrical information comprises the relevant information, adjacent area A1 of adjacent area A1 and B1 and random access channel resource that B1 distributes, measure time slot configuration and Serving cell and adjacent area A1 and B1 is no tight coupling collaboration mode.

Step 805, terminal is returned to acknowledge message successfully receiving after neighbor cell configuration metrical information.

Step 806, in the measurement time slot that terminal provides in Serving cell, interrupts also setting up down-going synchronous with adjacent area A1 and B1 according to this with the wireless connections of Serving cell.

Step 807a and step 807b, terminal sends random access synchronizing symbol in the Random Access Channel of adjacent area A1 and adjacent area B1 distribution respectively.

Step 808, terminal is at the wireless connections of non-measurement time slot recovery and Serving cell, normal transmission user service data.

Step 809, in another measurement time slot that terminal provides in Serving cell, interrupts also setting up down-going synchronous with adjacent area A1 and B1 according to this with the wireless connections of Serving cell.

Step 810a and step 810b, adjacent area A1 and B1, according to the random access synchronizing symbol detecting, generate suitable uplink synchronous configuration information, are sent to terminal by accidental access response message.

Step 811, terminal is at the wireless connections of non-measurement time slot recovery and Serving cell, normal transmission user service data.

Step 812, terminal complete adjacent area A1 and B1 radio link quality measure after, by the information reporting such as adjacent area mark, wireless signal measured value of coincidence measurement report condition to Serving cell.

Step 813, the nearby region measurement of the comprehensive analysing terminal in Serving cell is reported the result, and the accidental access response message that returns of adjacent area, determines switching target small area, is assumed to adjacent area A1 herein.

Step 814, handover preparation request is initiated to adjacent area A1 (Target cell of switching) in Serving cell (Serving cell of switching), comprising terminal related context information, as the carrying of terminal iidentification, wireless transmission and operation quality requirement etc., also can comprise that this terminal is in the radio transmission time delay of Serving cell and at the synchronous configuration information of Target cell.

Step 815, Target cell A1 determines and can receive this handover request according to own resource service condition.

Step 816, A1Xiang Serving cell, Target cell sends switching request acknowledgement message, comprising terminal mobility control information, the up-downgoing signaling that is terminal distribution according to synchronous configuration information and the Radio Resource of transfer of data, and license terminal starts the time point of wireless transmission and reception.

Step 817, Serving cell sends switching command to terminal, wherein carries the information such as terminal mobility control information, wireless resource scheduling information and wireless transmission and time of reception point of returning Target cell.

Step 818, terminal successfully receives after switching command, stops the transmission of control signal and user service data, disconnects the wireless connections with Serving cell.

Step 819, terminal realizes and the down-going synchronous of Target cell, then at the appointed time starts wireless transmission and reception, comprises that terminal sends to the switching of Target cell to complete control signal, and and Target cell between user service data receive and dispatch.

The handover delay of present embodiment is the service terminal time shown in the drawings, comprises the processing time of step 818 to step 819.

Refer to Fig. 9, Fig. 9 is the schematic flow sheet of cell switching method the 6th execution mode in communication system of the present invention.

It is tightly coupled community that cell switching method in the described communication system of present embodiment is applicable to collaboration mode, terminal is access service community, set up wireless transmission and connected carrying user service data, handover candidate cells comprises adjacent area A2 and adjacent area B2, specifically can comprise the following steps:

Step 901a and step 901b, initiation minizone, Serving cell cooperation, to adjacent area A2 and B2 requesting terminal, adjacent area to the noncompetitive random access channel resource of adjacent area.

Step 902a and step 902b, adjacent area A2 and adjacent area B2 accept Serving cell request, are respectively terminal distribution noncompetitive random access channel resource.

Step 903a and step 903b, adjacent area A2 and adjacent area B2 return to allocation result.

Step 904: Serving cell issues neighbor cell configuration metrical information to terminal, described neighbor cell configuration metrical information comprises the relevant information, adjacent area A2 of adjacent area A1 and B1 and noncompetitive random access channel resource that B2 distributes, measure time slot configuration and Serving cell and adjacent area A2 and B2 will adopt close coupling collaboration mode.

Step 905, terminal is returned to acknowledge message successfully receiving after neighbor cell configuration metrical information.

Step 906, in the measurement time slot that terminal provides in Serving cell, interrupts also setting up down-going synchronous with adjacent area A2 and B2 according to this with the wireless connections of Serving cell.

Step 907a and step 907b, terminal sends noncompetitive in the noncompetitive Random Access Channel of adjacent area A2 and adjacent area B2 distribution respectively and accesses at random synchronizing symbol.

Step 908, terminal is at the wireless connections of non-measurement time slot recovery and Serving cell, normal transmission user service data.

Step 909a and step 909b, adjacent area A2 and B2, according to the feature of the noncompetitive random access guiding symbol detecting, generate suitable uplink synchronous configuration information, send to the Serving cell of terminal by accidental access response message.

Step 910, terminal complete adjacent area A2 and B2 radio link quality measure after, by the information reporting such as adjacent area mark, wireless signal measured value of coincidence measurement report condition to Serving cell.

Step 911, the nearby region measurement of the comprehensive analysing terminal in Serving cell is reported the result, and the accidental access response message that returns of adjacent area, determines Target cell, is assumed to adjacent area A2 herein.

Step 912, handover preparation request is initiated to adjacent area A2 in Serving cell, comprising terminal related context information, as the carrying of terminal iidentification, wireless transmission and operation quality requirement etc., also comprise that this terminal is in the radio transmission time delay of Serving cell and at the synchronous configuration information of Target cell.

Step 913, Target cell A2 determines and can receive this handover request according to own resource service condition.

Step 914, A2Xiang Serving cell, Target cell sends switching request acknowledgement message, comprising terminal mobility control information, the up-downgoing signaling that is terminal distribution according to synchronous configuration information and the Radio Resource of transfer of data, and license terminal starts the time point of wireless transmission and reception.

Step 915, Serving cell sends switching command to terminal.

Step 916, terminal successfully receives after switching command, stops the transmission of control signal and user service data, disconnects the wireless connections with Serving cell.

Step 917, terminal realizes and the down-going synchronous of Target cell, then at the appointed time starts wireless transmission and reception, comprises that terminal sends to the switching of Target cell to complete control signal, and and Target cell between user service data receive and dispatch.

The handover delay of present embodiment is the service terminal time shown in the drawings, comprises the processing time of step 916 to step 917.

The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims

1. the cell switching method in communication system, is characterized in that, comprises the following steps:

2. the cell switching method in communication system according to claim 1, is characterized in that, measuring, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in time slot is further comprising the steps of:

Measure time slot at first group, by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol;

Measurement time slot after described first group is measured time slot receives the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates;

3. the cell switching method in communication system according to claim 1, is characterized in that, measuring, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in time slot is further comprising the steps of:

Receive the downstream wireless signals of each handover candidate cells at second group of measurement time slot;

According to described downstream wireless signals, generate the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises the radio link quality parameter between communication terminal and corresponding handover candidate cells;

Send described radio link quality measurement report to described Serving cell.

4. the cell switching method in communication system according to claim 1, is characterized in that, measuring, the step that by described random access channel resource, each handover candidate cells is sent to random access synchronizing symbol in time slot is further comprising the steps of:

Receive the downstream wireless signals of each handover candidate cells;

Measure time slot at the 3rd group and receive the uplink synchronous configuration information that response described random access synchronizing symbol in each handover candidate cells generates;

Described uplink synchronous configuration information is loaded in described radio link quality measurement report;

Send described radio link quality measurement report to described Serving cell.

5. the cell switching method in communication system according to claim 1, is characterized in that, described handover candidate cells and described Serving cell are same community.

6. the cell switching method in communication system according to claim 1, is characterized in that, described random access channel resource comprises noncompetitive random access resource.

7. according to the cell switching method in the communication system described in any one in claim 1 to 6, it is characterized in that, described measurement time slot comprises the wireless measurement time slot that described Serving cell is set.

8. a communication system Zhong community switched system, is characterized in that, comprising:

9. communication system Zhong according to claim 8 community switched system, is characterized in that, described random access module also for:

10. the cell switching method in communication system, is characterized in that, comprises the following steps:

Receive the wireless resource scheduling information that described Target cell responds described handover request and distribute to described communication terminal;

Cell switching method in 11. communication systems according to claim 10, is characterized in that, before the step of the uplink synchronous configuration information generating at the random access of described reception each handover candidate cells response synchronizing symbol, further comprising the steps of:

Initiation minizone cooperates, and arrives the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells;

Cell switching method in 12. communication systems according to claim 11, it is characterized in that, initiating minizone cooperation, and arrive the step of random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells before, further comprising the steps of:

Described communication terminal is carried out to radio link quality detection to the link of described Serving cell;

Cell switching method in 13. communication systems according to claim 10, is characterized in that, before sending the step of handover request to Target cell, further comprising the steps of:

Receive the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises the radio link quality parameter between communication terminal and corresponding handover candidate cells;

Described radio link quality parameter is read from described radio link quality measurement report in corresponding each handover candidate cells;

Cell switching method in 14. communication systems according to claim 10, is characterized in that, the step that receives the uplink synchronous configuration information of the random access of each handover candidate cells response synchronizing symbol generation comprises the following steps:

Receive the response message that the described random access synchronizing symbol of each candidate cell response sends, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates;

Or,

Receive the radio link quality measurement report of corresponding each handover candidate cells, from described response message, read the uplink synchronous configuration information that response described random access synchronizing symbol in handover candidate cells generates, described radio link quality measurement report comprises that communication terminal responds with radio link quality parameter and handover candidate cells between corresponding handover candidate cells the uplink synchronous configuration information that described random access synchronizing symbol generates.

15. according to claim 10 to the cell switching method in the communication system described in any one in 14, it is characterized in that, the step that sends handover request to described Target cell comprises the following steps:

By the described communication terminal uplink synchronous configuration information that the described random access synchronizing symbol of the terminal iidentification in the contextual information of the radio transmission time delay of described Serving cell and described Target cell, described communication terminal, wireless transmission beared information and operation quality requirement and described Target cell response generates respectively, be loaded in described handover request;

Send described handover request to described Target cell;

Receive the wireless resource scheduling information that described Target cell responds described handover request and distribute to described communication terminal, described wireless resource scheduling information comprises that described Target cell distributes to the Radio Resource of the up-downgoing signaling of described communication terminal, transfer of data and permit described communication terminal to start the temporal information of wireless output and wireless receiving.

Cell switching method in 16. communication systems according to claim 15, it is characterized in that, the temporal information that described communication terminal starts wireless output and wireless receiving is corresponding to community inter-process time delay, minizone radio transmission time delay, communication terminal radio transmission time delay communication terminal inter-process time delay and the radio transmission time delay of communication terminal between Target cell in Serving cell of communicating by letter.

17. 1 kinds of communication system Zhong community switched systems, is characterized in that, comprising:

Synchronizing information receiver module, the uplink synchronous configuration information generating for receiving the random access of each handover candidate cells response synchronizing symbol, wherein, described random access synchronizing symbol is sent to each handover candidate cells by random access channel resource in measurement time slot by communication terminal;

18. communication system Zhong according to claim 17 community switched systems, is characterized in that, also comprise Target cell chosen module, for:

Receive the radio link quality measurement report of corresponding each handover candidate cells, described radio link quality measurement report comprises the radio link quality parameter of by described random access channel resource, handover candidate cells being carried out radio link quality measurement gained;

The radio link quality parameter reading according to the each handover candidate cells of correspondence, it is Target cell that the signal of communication quality between selected and described communication terminal meets pre-conditioned handover candidate cells.

19. according to the communication system Zhong community switched system described in claim 17 or 18, it is characterized in that, also comprise channel resource request module, for initiating minizone cooperation, and arrive the random access channel resource of each handover candidate cells to communication terminal described in the request of each handover candidate cells; Receiving each handover candidate cells is the random access channel resource that described communication terminal distributes, and sends to described communication terminal.