CN101047433A - Synchronous set-up method and system - Google Patents

Synchronous set-up method and system Download PDF

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CN101047433A
CN101047433A CN 200610094929 CN200610094929A CN101047433A CN 101047433 A CN101047433 A CN 101047433A CN 200610094929 CN200610094929 CN 200610094929 CN 200610094929 A CN200610094929 A CN 200610094929A CN 101047433 A CN101047433 A CN 101047433A
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base station
priority
synchronous
self
cbp
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CN101047433B (en
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吕林军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

A setting up method of synchronization includes distributing a priority level for each base station when system is initialized, setting up synchronization to source base station and using synchronization priority level of said source base station to replace current synchronization priority level of its own if that current synchronization priority level of its own is lower than source base station synchronization priority level carried in CBP packet is detected out when CBP packet sent from overlapped source base station of its own is received by current base station.

Description

A kind of method for synchronous setting-up and system
Technical field
The present invention relates to the wireless communication system technologies field, be specifically related to a kind of method for synchronous setting-up and system.
Background technology
Radio area network (WRAN, Wireless Regional Access Network) is a kind of emerging network technology, and can be area remote, that the density of population is lower provides high bandwidth to cover on a large scale.WRAN is a kind of system that exempts to permit operation, use cognitive radio technology, the idle frequency band of seeking permitted user (LU) communicates, for example in very high frequency(VHF) (VHF)/hyperfrequency licensed band such as (UHF) of wireless digital TV-set (DTV), seeking does not have the carrying frequency range of occupied frequency range as WRAN.Simultaneously, also all exempt between the WRAN system to permit that each WRAN system can be used by a plurality of operators, so the WRAN system does not have frequency spectrum planning, just may have self-interference between the base station of WRAN, and self-interference worsens more along with the increase of the area coverage of WRAN system.Since the WRAN specific assigned silence period (QP) detect the LU subscriber signal, therefore, if not alignment of the QP of adjacent base station, when having self-interference, can make the detection deleterious of WRAN system to the LU subscriber signal.
In order to reduce this self-interference phenomenon, need the frame of neighbor cell be alignd, make that the downlink frame between the sub-district is set up synchronously, to reduce the interference between the base station; In addition, subscriber equipment can send sub-frame of uplink by using directional antenna, avoids the interference of the sub-frame of uplink of self to the descending sub frame of self.
Fig. 1 sets up synchronous flow chart in the prior art between two overlapping base stations, as shown in Figure 1, its concrete steps are as follows:
Step 101: coexistence beacon protocol (CBP) bag that base station search and self overlapping source base station are sent, write down the frame offset information that this CBP bag carries.
CBP comprises: leading (Preamble), superframe control head (SCH) and CBP medium access control (MAC) protocol Data Unit (PDU) three parts, wherein, leading being used for synchronously and channel estimating, SCH is used for providing the signal of current area to subscriber equipment.
Base station and subscriber equipment at one's leisure, perhaps at the superframe that coexists quiet period certainly or send from coexistence window interscan and self overlapping source base station, and subscriber equipment is when receiving the CBP bag, this CBP bag be sent to base station under self.
Step 102: the base station judges whether self sets up synchronously with the source base station that sends this CBP bag, if, execution in step 107; Otherwise, execution in step 103.
Here, base station i can judge whether synchronous with the overlapping base station j foundation of self in the following manner:
Judge | ((FS i-Frame_Number i-1) * FDC i+ (FDC i-Reception_Offset))-((FS j-Frame-_Number j-1) * FDC j+ (FDC j-Transmission_Offset)) | whether equal 0 or FS iIf,, base station i judges synchronous with base station j foundation; Otherwise, do not judge and set up synchronously with base station j.
Wherein, FS iContained frame number in the superframe that expression base station i sends; FS jContained frame number in the superframe that expression base station j sends; Frame_Number iThe frame number of the CBP bag that expression base station i sends; Frame_Number jThe frame number of the CBP bag that expression base station j sends; FDC iThe number of contained OFDM symbol in the superframe that expression base station i sends; FDC jThe number of contained OFDM symbol in the superframe that expression base station j sends; The CBP that carries during the CBP that Reception_Offset sends for base station j wraps, base station j supports wraps in the position in the superframe, and Reception_Offset is a unit with the WRAN time slot; Transmission_Offset is for after base station i receives the CBP bag that base station j sends, the position of i current receiving slot in base station in the superframe of base station i, and Transmission_Offset is a unit with the WRAN time slot.
Step 103: the current synchronous entry condition that whether satisfies with this source base station is judged in the base station, if, execution in step 104; Otherwise, go to step 101.
Here, for base station i, only when meeting the following conditions, base station i just can start the synchronizing process with base station j:
| ( ( FS i - Frame _ Num ber i - 1 ) × FDC i + ( FDC i - Reception _ Offset ) ) - ( ( FS j - Frame _ Numb -
er j - 1 ) FDC j + ( FDC j - Transmission _ Offset ) ) | ≤ FS i * FDC i 2 - - - ( 1 )
Wherein, FS i, FS j, Frame_Number i, Frame_Number j, FDC i, FDC j, Reception_Offset, Transmission_Offset implication identical with the implication of corresponding symbol in the step 102.
Distinguishingly, work as FS i=FS j=FS and FDC i=FDC jDuring=FDC, formula (1) can be reduced to:
| ( Frame _ Numb er i - Frame _ N umber i ) × FDC + Transmission _ Offset - Reception _ Offset | ≤ FS * FDC 2 - - - ( 2 )
Step 104: the base station is according to the frame offset information that carries in this CBP bag, determine frame slip value (Slide Count), symbol-slips value (Slide Amount) and the glide direction of the frame delivery time of self with respect to the frame delivery time of this source base station, and give all subscriber equipmenies of self by frame slip request (FSL_REQ) information broadcast with this frame slip value, symbol-slips value and glide direction, begin to carry out the same step calibration in sub-district with notifying user equipment.
Before finished with step calibration this sub-district, the base station did not distribute any active from coexistence window.
Definite formula of symbol-slips value and glide direction is as follows:
When FDC _ Transmission _ Offset + Reception _ Offset ≤ | FDC 2 | The time,
Slide_Amount=FDC-Transmission_Offset+Reception_Offset, glide direction is: to the right;
When FDC _ Transmission _ Offset + Reception _ Offset > | FDC 2 | The time,
Slide_Amount=Transmission_Offset-Reception_Offset, glide direction is: left.
Behind the frame slip request message that send the base station under subscriber equipment is received self, the CBP bag that stops source base station being sent is transmitted to base station under self.
Step 105: the base station is distributed from coexistence window with the place, end of some cycles at the uplink frame time slot.
Step 106: the base station judges whether to wrap at the CBP that source base station is sent that receives on coexistence window of predetermined number continuously, if, execution in step 107; Otherwise, go to the action that step 101 is carried out the next superframe of sending the search source base station.
Step 107: the base station judges once whether do not receiving that on coexistence window the CBP that this source base station is sent wraps in this scheduled duration every scheduled duration, if, synchronization loss is determined in the base station, and when next superframe arrives, go to the action that step 101 is carried out the next CBP bag of sending the search source base station; Otherwise, execution in step 108.
Step 108: the base station determines that synchronous maintenance is normal, judges whether next superframe arrives, if go to the action that step 101 is carried out the next CBP bag of sending the search source base station; Otherwise, continue to wait for that the CBP that source base station is sent wraps, go to step 107.
As can be seen: prior art has only provided between two base stations that overlap each other and has set up synchronous process; and in real network; a base station usually can be simultaneously overlapping with two or more base stations; at this moment; how setting up synchronously quickly and efficiently between this plural base station, prior art does not provide the solution of this aspect.
Summary of the invention
In view of this, the invention provides a kind of method for synchronous setting-up and system, between two or more overlapping base stations, effectively to set up synchronously.
Technical scheme of the present invention is achieved in that
A kind of method for synchronous setting-up, when system initialization starts each base station assigns initial synchronisation priority, comprise: the base station receives the CBP bag of sending with self overlapping source base station, detect the synchronous priority that self current synchronous priority is lower than the source base station that carries in this CBP bag, then set up synchronously, and replace self current synchronous priority with the synchronous priority of this source base station with source base station.
Described base station further comprises after replacing self current synchronous priority with the synchronous priority of source base station: the base station is distributed from coexistence window in self uplink frame, and do not detect and wrap, then replace self current synchronous priority with the initial synchronisation priority of self at the CBP that self works as preamble priority that carries that source base station is sent that in coexistence window, receives of continuous predetermined number.
Further comprise after the current synchronous priority of synchronous priority replacement self of described base station with source base station: the base station judges whether to receive that every scheduled duration the CBP that self works as preamble priority that carries that source base station is sent wraps in this scheduled duration, if continue the CBP bag of waiting for that this source base station is sent; Otherwise, replace self current synchronous priority with the initial synchronisation priority of self.
Describedly be: the initial synchronisation priority of determining the base station according to the address information of base station for each base station assigns initial synchronisation priority;
The synchronous priority of the source base station that carries in the described CBP bag is: the synchronous address information of source base station;
Described base station detects the synchronous priority that self current synchronous priority is lower than the source base station that carries in this CBP bag: the base station is according to the address synchronously and the corresponding relation of priority synchronously, determines that self current synchronous priority is lower than the synchronous priority of the source base station that carries in this CBP bag;
Described base station with the current synchronous priority of synchronous priority replacement self of this source base station is: self current synchronous address is replaced in the synchronous address with this source base station.
The address of described base station is medium access control (MAC) address or IP address.
Describedly when system initialization starts for each base station assigns initial synchronisation priority be: operator is priority of each base station configuration when system initialization, each base station is with the initial synchronisation priority of this priority as self.
The synchronous priority of described source base station is carried in the CBP Medium Access Control (MAC) Protocol Data Unit (PDU) of CBP bag.
The CBP bag that send reception sources base station, described base station is: the base station receives the more than one CBP bag that more than one source base station is sent simultaneously,
The synchronous priority that reception sources base station, described base station sends after the CBP bag, detect self is lower than before the synchronous priority of source base station, and further comprise: a synchronous priority the highest is selected in the base station in the synchronous priority that all CBP bags carry,
And the synchronous priority that the synchronous priority that described base station detects self is lower than source base station is: the synchronous priority that the base station detects self is lower than the highest described synchronous priority,
And described synchronous priority with source base station as self current synchronous priority is: with the highest described synchronous priority as self current synchronous priority.
A kind of system that sets up synchronously, this system comprises:
The priority assignment module is used for when system initialization starts synchronously, is initial synchronisation priority of each base station assigns, the initial synchronisation priority of each base station is sent to the synchronous startup judge module of each base station respectively;
Start judge module synchronously, be used to receive the initial synchronisation priority that synchronous priority assignment module is sent; When receiving the CBP bag of sending with self overlapping source base station, and detect and self be lower than the synchronous priority of the source base station that carries in this CBP bag when preamble priority, then the synchronous priority of this source base station is carried to send in the synchronous startup indication and sets up module synchronously; Replace self when preamble priority to set up the synchronous priority that module sends synchronously;
Set up module synchronously, be used for according to starting the synchronous startup indication that judge module is sent synchronously, set up synchronously with the source base station that sends the CBP bag, and the synchronous priority that will start the source base station that judge module sends synchronously sends to synchronous startup judge module as self current synchronous priority.
The described module of setting up synchronously further comprises: the confirmation of synchronization module, be used for after the current synchronous priority of synchronous priority replacement self of the source base station of sending with synchronous startup judge module, in the uplink frame time slot, distribute from coexistence window, and judge whether to wrap at the CBP that self works as preamble priority that carries that source base station is sent that in coexistence window, receives of predetermined number continuously, if not, replace self when preamble priority with the initial synchronisation priority of self, and the preamble priority of self working as after will replacing sends to synchronous startup judge module.
The described module of setting up synchronously further comprises: the synchronous maintenance module, be used for judging whether in this scheduled duration, do not receiving that on coexistence window the CBP that self works as preamble priority that carries that this source base station is sent wraps every scheduled duration, if, replace self when preamble priority with the initial synchronisation priority of self, and the preamble priority of self working as after will replacing sends to synchronous startup judge module.
Compared with prior art, it is initial synchronisation priority of each base station assigns in advance that the present invention passes through, when the CBP bag of sending with self overlapping source base station is received in the base station, if detect the synchronous priority that self current synchronous priority is lower than the source base station that carries in this CBP bag, then set up synchronously with source base station, and replace self current synchronous priority with the synchronous priority of this source base station, the present invention is according to the comparison of the synchronous priority between overlapping base station, just can determine whether start synchronizing process, realized between two or more overlapping base stations synchronously.
Description of drawings
Fig. 1 sets up synchronous flow chart in the prior art between two overlapping base stations;
Fig. 2 is the synchronous flow chart of setting up between overlapping base station provided by the invention;
Fig. 3 sets up synchronous flow chart for what the embodiment of the invention provided between overlapping base station;
Fig. 4 is the synchronous system's composition diagram of setting up between overlapping base station provided by the invention;
Fig. 5 is the base stations united body schematic diagram in the application example of the present invention.
Embodiment
For more clearly describing the present invention, at first provide to give a definition:
Overlapping base station: two or more base stations that refer to have overlapping overlay area.
Base stations united body: with each base station is a summit, when two base stations are overlapping, draws a connecting line between the summit of this two base station representative, and the set of base station of forming all summits representatives of connected domain is called base stations united body.
Synchronising base station: synchronous if base station A is adjusted into self frame delivery time with the frame delivery time of base station B, claim that then base station B is the synchronising base station of base station A.
Synchronous priority: the corresponding priority in each base station, concerning also not carrying out synchronous the base station A that overlaps each other and B with any base station, if it is synchronous that base station A is adjusted into self frame delivery time with the frame delivery time of base station B, the priority that then claims base station B be base station A when preamble priority.
When system initialization starts, be priority of each base station assigns, and with the initial synchronisation priority of this priority as the base station.
Synchronous MAC Address/IP address: concerning also not carrying out synchronous the base station A that overlaps each other and B with any base station, if it is synchronous that base station A is adjusted into self frame delivery time with the frame delivery time of base station B, the MAC Address/IP address that then claims base station B is synchronous MAC Address/IP address of base station A.
When system initialization starts, the MAC Address/IP address of base station is made as the initial synchronisation MAC Address/IP address of base station.
For a base station A, if this base station A is simultaneously overlapping with base station B and C, then between base station A and the B, the process of setting up synchronously between base station A and the C can not reentry, that is: base station A is setting up in the synchronous process with base station B, can not set up process synchronously with base station C simultaneously.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 2 is the synchronous flow chart of setting up between overlapping base station provided by the invention, and as shown in Figure 2, its concrete steps are as follows:
Step 201: be priority of each base station assigns, the priority of self is preserved in each base station, and with the initial synchronisation priority of this priority as self.
Step 202: the CBP bag that base station search and self overlapping source base station are sent, write down the frame offset information that carries in this CBP bag, carry the synchronous priority of the source base station that sends this CBP bag in this CBP bag simultaneously.
Among the present invention, concerning each base station, will be called source base station to the base station of this base station transmission CBP bag.
Each base station all will send to other base station and carry self when the CBP of preamble priority bag, to be used for other base station and self to set up synchronous.
Because which field existing standard the CBP MAC PDU of CBP bag specifically comprises also stipulate, so among the present invention, the preamble priority of working as of source base station can be carried among the CBP MAC PDU.
Step 203: the base station judges whether self current synchronous priority is lower than the synchronous priority of source base station, if, execution in step 204; Otherwise, execution in step 208.
In step 202, if the base station searches the more than one CBP bag that more than one source base station is sent simultaneously, then a synchronous priority the highest is selected in the base station in the synchronous priority of the source base station that these all CBP bags carry; In step 203, the base station judges whether the synchronous priority of self is lower than this highest synchronous priority, if, execution in step 204, and when setting up synchronously, replace self current synchronous priority with this highest synchronous priority.
Step 204: the base station is according to the frame offset information that carries in this CBP bag, determine frame slip value, symbol-slips value and glide direction, and give all subscriber equipmenies of self by frame slip request (FSL_REQ) information broadcast with this frame slip value, symbol-slips value and glide direction, begin to carry out the same step calibration in sub-district with notifying user equipment; Replace self current synchronous priority with the synchronous priority of source base station simultaneously.
Step 205: the base station is distributed from coexistence window with the place, end of some cycles at self uplink frame time slot.
Step 206: the base station judges whether to wrap at the CBP that self works as preamble priority that carries that source base station is sent that receives on coexistence window of predetermined number continuously, if determine this subsynchronous finishing, execution in step 208; Otherwise, determine this synchronization failure, execution in step 207.
Step 207: self is replaced when preamble priority with self initial synchronisation priority in the base station, goes to the action that step 202 is carried out next CBP bag that this source base station of search sends.
After this synchronization failure is determined in the base station, stop at place, uplink frame time slot end and distribute from coexistence window.
Step 208: the base station judges whether in this scheduled duration not carry self when the CBP of preamble priority bag what receiving on coexistence window that source base station sends every scheduled duration, if, execution in step 210; Otherwise, execution in step 209.
Step 209: the base station determines that synchronous maintenance is normal, judges whether next superframe arrives, if go to the action that step 202 is carried out the CBP bag of sending continuation search source base station; Otherwise, continue to wait for that the CBP that source base station is sent wraps, go to step 208.
Step 210: synchronization loss is determined in the base station, and replaces self current synchronous priority with the initial synchronisation priority of self, when next superframe arrives, goes to the action that step 202 is carried out the next CBP bag of sending the search source base station.
After this synchronization loss is determined in the base station, stop at place, uplink frame time slot end and distribute from coexistence window.
In concrete the application, can directly be priority of each base station configuration by operator etc., the priority of this configuration is the initial synchronisation priority of each base station; Also can determine the height of base station priority according to the size of medium access control (MAC) address of base station or IP address, below be example with the MAC Address, and the present invention is further specified.
Fig. 3 be the embodiment of the invention provide between overlapping base station, set up synchronous flow chart, in the present embodiment, set: the more little priority of MAC Address is high more, and as shown in Figure 3, its concrete steps are as follows:
Step 301: ascending according to the MAC Address of base station is priority of each base station assigns successively from high to low, and with the MAC Address of the base station initial synchronisation MAC Address as the base station.
Step 302: the CBP bag that each base station search and self overlapping source base station are sent, write down the frame offset information that this CBP bag carries, carry the synchronous MAC Address of the source base station that sends this CBP bag in this CBP bag simultaneously.
The synchronous MAC Address of source base station is carried among the CBP MAC PDU of CBP bag, at this moment, and form such as the table 1 of CBP MAC PDU:
Field (Syntax) Length Explain (Notes)
CBP MAC PDU ()
Tx_ID 48bits Indication sends the synchronous MAC address of the source base station of CBP bag.The default value of this field is the MAC Address of the source base station of transmission CBP bag.In the repeating process of intermediate user equipment, this field remains unchanged at the CBP bag.
Reception_Offset The position of support CBP in superframe that the CBP bag of the synchronising base station of the source base station of indication transmission CBP bag carries is unit with the WRAN time slot.
HCS 8bits Verification sequence
}
The form one of table 1 CBP MAC PDU
Step 303: whether the synchronous MAC Address that self is judged in the base station greater than the synchronous MAC Address of source base station, if, execution in step 304; Otherwise, execution in step 308.
Step 304: the frame offset information that carry according to this CBP bag the base station, determine frame slip value, symbol-slips value and glide direction, and give all subscriber equipmenies of self by frame slip request (FSL_REQ) information broadcast with this frame slip value, symbol-slips value and glide direction, begin to carry out the same step calibration in sub-district with notifying user equipment; Replace self current synchronous MAC Address with the synchronous MAC Address of source base station simultaneously.
Step 305: the base station is distributed from coexistence window with the place, end of some cycles at the uplink frame time slot.
Step 306: the base station judges whether to wrap at the CBP that self works as the preamble MAC Address that carries that source base station is sent that receives on coexistence window of predetermined number continuously, if determine this subsynchronous finishing, execution in step 308; Otherwise this synchronization failure is determined in the base station, execution in step 307.
Step 307: self is replaced when the preamble MAC Address with the self MAC address in the base station, and when next superframe arrives, goes to the action that step 302 is carried out next CBP bag of sending the search source base station.
Step 308: the base station judges whether in this scheduled duration not carry self when the CBP of preamble MAC Address bag what receiving on coexistence window that source base station sends every scheduled duration, if, execution in step 310; Otherwise, execution in step 309.
Step 309: the base station determines that synchronous maintenance is normal, judges whether next superframe arrives, if go to the action that step 302 is carried out the next CBP bag of sending the search source base station; Otherwise, continue to wait for that the CBP that source base station is sent wraps, go to step 308.
Step 310: synchronization loss is determined in the base station, and replaces self when the preamble MAC Address with the MAC Address of self, and goes to the action that step 302 is carried out the next CBP bag of sending the search source base station when next superframe arrives.
What Fig. 3 provided is the priority of determining the base station according to MAC Address, and sets the low more high situation of the more little priority of MAC Address, and in actual applications, it is high more also can to set the big more priority of MAC Address; Simultaneously, when determining base station priority according to the IP address, the synchronous IP address of source base station also is carried among the CBP MAC PDU of CBP bag, and at this moment, the form of CBP MAC PDU is as shown in table 2:
Field (Syntax) Length Explain (Notes)
CBP MAC PDU ()
Tx_ID 32bits Indication sends the synchronous IP address of the source base station of CBP bag.The default value of this field is the IP address of the source base station of transmission CBP bag.In the repeating process of intermediate user equipment, this field remains unchanged at the CBP bag.
Reception_Offset The support CBP that the CBP bag of the synchronising base station of the source base station of indication transmission CBP bag carries wraps in the position in the superframe, is unit with the WRAN time slot.
HCS 8bits Verification sequence
}
The form two of table 2 CBP MAC PDU
Fig. 4 is system's composition diagram of synchronous foundation provided by the invention, as shown in Figure 4, it mainly comprises: synchronously priority assignment module 41, start judge module 42 and set up module 43 synchronously synchronously, wherein: start judge module 42 synchronously and set up module 43 synchronously and be arranged in the base station.
Synchronous priority assignment module 41: be used for when system initialization starts, be priority of each base station assigns, and, the initial synchronisation priority of each base station is sent to the synchronous startup judge module 42 of each base station respectively with the initial synchronisation priority of this priority as each base station.
Start judge module 42 synchronously: be used to receive the initial synchronisation priority that synchronous priority assignment module 41 is sent; When receiving the frame offset information that carries this source base station sent with self overlapping source base station and synchronously behind the CBP bag of priority, if detect the synchronous priority that self current synchronous priority is lower than the source base station that this CBP bag carries, then with the frame offset information that carries in this CBP bag and synchronously priority be carried to send in the synchronous startup indication and set up module 43 synchronously; Replace self when preamble priority with this synchronous priority when receiving when setting up the synchronous priority that module 43 sends synchronously.
Set up module 43 synchronously: be used for after receiving the synchronous startup indication of carrying frame offset information and synchronous priority that synchronous startup judge module 42 is sent, according to this frame offset information, calculate frame slip value, time slot slip value and glide direction, and send this frame slip value, time slot slip value and glide direction to self all subscriber equipment, simultaneously replace self current synchronous priority, self the current synchronous priority after this replacement is sent to synchronous startup judge module 42 with the synchronous priority of the source base station that carries in the synchronous startup indication.
Further, set up synchronously and comprise a confirmation of synchronization module in the module 43, this module is used for, after the current synchronous priority of synchronous priority replacement self of the source base station that in synchronous startup indication, carries, distribute from coexistence window at place, uplink frame time slot end with some cycles, and judge whether to wrap at the CBP that self works as preamble priority that carries that source base station is sent that in coexistence window, receives of predetermined number continuously, if not, initial synchronisation priority with self is replaced self current synchronous priority, and the preamble priority of self working as after will replacing sends to synchronous startup judge module 42.
Further, set up synchronously and comprise a synchronous maintenance module in the module 43, this module is used for, judge whether in this scheduled duration, do not receiving that on coexistence window the CBP that self works as preamble priority that carries that source base station is sent wraps every scheduled duration, if, replace self when preamble priority with the initial synchronisation priority of self, and the preamble priority of self working as after will replacing sends to synchronous startup judge module 42; Otherwise, before next superframe arrives, continue the CBP bag of waiting for that source base station is sent.
Below provide a concrete application example of the present invention:
Fig. 5 is the schematic diagram of a base stations united body of being made up of base station A, B, C, D, E, as shown in Figure 5, if the priority of base station A, B, C, D, E is respectively 3,1,4,2,5, this priority equals the initial synchronisation priority of each base station, suppose that each base station receives the CBP bag of sending with self all overlapping base station simultaneously, then synchronizing process is specific as follows the first round:
For base station A, the initial synchronisation priority of base station A is higher than base station E and is lower than base station B, therefore, base station A is as the criterion with base station B and carries out synchronously, after finishing synchronously, the synchronous priority of base station A changes to the initial synchronisation priority of base station B: 1, and the synchronous priority of base station B remains unchanged;
For base station B, the initial synchronisation priority of base station B is higher than base station A and base station C, and therefore, base station B does not carry out synchronously;
For base station C, the initial synchronisation priority of base station C both had been lower than that base station B also is lower than base station D and the initial synchronisation priority of base station B is higher than base station D, therefore, base station C is as the criterion with base station B and carries out synchronously, after finishing synchronously, the synchronous priority of base station C changes to the initial synchronisation priority of base station B: 1, and the synchronous priority of base station B remains unchanged;
For base station D, the initial synchronisation priority of base station D both had been higher than base station C and also had been higher than base station E, so base station D does not carry out synchronously;
For base station E, the initial synchronisation priority of base station E both had been lower than base station A and also had been lower than base station D, and the initial synchronisation priority of base station D is higher than base station A, therefore, base station E is as the criterion with base station D and carries out synchronously, after finishing synchronously, the synchronous priority of base station E changes to the initial synchronisation priority of base station D: 2.
As can be known: after first round synchronizing process, the synchronous priority of base station A, B, C all is 1, and the synchronous priority of base station D and E all is 2.
Second to take turns synchronizing process as follows:
For base station A, B and C and since current synchronous priority all be not less than with self overlapping base station when preamble priority, so needn't carry out again synchronously;
For base station D, because D current synchronous priority in base station is lower than the current synchronous priority of base station C, therefore, base station D is as the criterion with base station C and carries out synchronously, and after finishing synchronously, the preamble priority of working as of base station D changes to the current synchronous priority of base station C: 1;
For base station E, because E current synchronous priority in base station is lower than the current synchronous priority of base station A, therefore, base station E is as the criterion with base station A and carries out synchronously, and after finishing synchronously, E current synchronous priority in base station changes to the current synchronous priority of base station A: 1.
As can be seen: after taking turns synchronizing process through second, the synchronous priority of all base stations all is: 1, and the finishing synchronously of this base stations united body.
The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1, a kind of method for synchronous setting-up, it is characterized in that, when system initialization starts each base station assigns initial synchronisation priority, this method comprises: the base station receives the coexistence beacon protocol CBP bag of sending with self overlapping source base station, detect the synchronous priority that self current synchronous priority is lower than the source base station that carries in this CBP bag, then set up synchronously, and replace self current synchronous priority with the synchronous priority of this source base station with source base station.
2, the method for claim 1, it is characterized in that, described base station further comprises after replacing self current synchronous priority with the synchronous priority of source base station: the base station is distributed from coexistence window in self uplink frame, and do not detect and wrap, then replace self current synchronous priority with the initial synchronisation priority of self at the CBP that self works as preamble priority that carries that source base station is sent that in coexistence window, receives of continuous predetermined number.
3, method as claimed in claim 1 or 2, it is characterized in that, further comprise after the current synchronous priority of synchronous priority replacement self of described base station with source base station: the base station judges whether to receive that every scheduled duration the CBP that self works as preamble priority that carries that source base station is sent wraps in this scheduled duration, if continue the CBP bag of waiting for that this source base station is sent; Otherwise, replace self current synchronous priority with the initial synchronisation priority of self.
4, the method for claim 1 is characterized in that, describedly for each base station assigns initial synchronisation priority is: the initial synchronisation priority of determining the base station according to the address information of base station;
The synchronous priority of the source base station that carries in the described CBP bag is: the synchronous address information of source base station;
Described base station detects the synchronous priority that self current synchronous priority is lower than the source base station that carries in this CBP bag: the base station is according to the address synchronously and the corresponding relation of priority synchronously, determines that self current synchronous priority is lower than the synchronous priority of the source base station that carries in this CBP bag;
Described base station with the current synchronous priority of synchronous priority replacement self of this source base station is: self current synchronous address is replaced in the synchronous address with this source base station.
5, method as claimed in claim 4 is characterized in that, the address of described base station is media access control MAC address or IP address.
6, the method for claim 1, it is characterized in that, describedly when system initialization starts for each base station assigns initial synchronisation priority be: operator is priority of each base station configuration when system initialization, each base station is with the initial synchronisation priority of this priority as self.
As claim 1 or 4 or 6 described methods, it is characterized in that 7, the synchronous priority of described source base station is carried among the CBP Medium Access Control (MAC) Protocol Data Unit PDU of CBP bag.
8, the method for claim 1 is characterized in that, the CBP bag that send reception sources base station, described base station is: the base station receives the more than one CBP bag that more than one source base station is sent simultaneously,
The synchronous priority that reception sources base station, described base station sends after the CBP bag, detect self is lower than before the synchronous priority of source base station, and further comprise: a synchronous priority the highest is selected in the base station in the synchronous priority that all CBP bags carry,
And the synchronous priority that the synchronous priority that described base station detects self is lower than source base station is: the synchronous priority that the base station detects self is lower than the highest described synchronous priority,
And described synchronous priority with source base station as self current synchronous priority is: with the highest described synchronous priority as self current synchronous priority.
9, a kind of system that sets up synchronously is characterized in that this system comprises:
The priority assignment module is used for when system initialization starts synchronously, is initial synchronisation priority of each base station assigns, the initial synchronisation priority of each base station is sent to the synchronous startup judge module of each base station respectively;
Start judge module synchronously, be used to receive the initial synchronisation priority that synchronous priority assignment module is sent; When receiving the CBP bag of sending with self overlapping source base station, and detect and self be lower than the synchronous priority of the source base station that carries in this CBP bag when preamble priority, then the synchronous priority of this source base station is carried to send in the synchronous startup indication and sets up module synchronously; Replace self when preamble priority to set up the synchronous priority that module sends synchronously;
Set up module synchronously, be used for according to starting the synchronous startup indication that judge module is sent synchronously, set up synchronously with the source base station that sends the CBP bag, and the synchronous priority that will start the source base station that judge module sends synchronously sends to synchronous startup judge module as self current synchronous priority.
10, system as claimed in claim 9, it is characterized in that, the described module of setting up synchronously further comprises: the confirmation of synchronization module, be used for after the current synchronous priority of synchronous priority replacement self of the source base station of sending with synchronous startup judge module, in the uplink frame time slot, distribute from coexistence window, and judge whether to wrap at the CBP that self works as preamble priority that carries that source base station is sent that in coexistence window, receives of predetermined number continuously, if not, replace self when preamble priority with the initial synchronisation priority of self, and the preamble priority of self working as after will replacing sends to synchronous startup judge module.
11, system as claimed in claim 9, it is characterized in that, the described module of setting up synchronously further comprises: the synchronous maintenance module, be used for judging whether in this scheduled duration, do not receiving that on coexistence window the CBP that self works as preamble priority that carries that this source base station is sent wraps every scheduled duration, if, replace self when preamble priority with the initial synchronisation priority of self, and the preamble priority of self working as after will replacing sends to synchronous startup judge module.
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