CN101384019B - Method, apparatus implementing base station synchronization and base station - Google Patents
Method, apparatus implementing base station synchronization and base station Download PDFInfo
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- CN101384019B CN101384019B CN2007101214474A CN200710121447A CN101384019B CN 101384019 B CN101384019 B CN 101384019B CN 2007101214474 A CN2007101214474 A CN 2007101214474A CN 200710121447 A CN200710121447 A CN 200710121447A CN 101384019 B CN101384019 B CN 101384019B
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Abstract
The invention discloses a method for realizing base station synchronization, which includes the following steps: a second base station defines a first base station according to indication information sent by other base stations; the second base station searches the position of a descending pilot frequency time slot (DwPTS) of the first base station and adjusts the position of the DwPTS according to the position of the searched DwPTS; the second base station reads a system frame number (SFN) from the broadcasting information of the first base station and updates the SFN to be the read SFN. In the invention, the second base station realizes synchronization among different base stations through building the time slot synchronization and frame synchronization with the first base station. Not every base station is needed to be provided with a GPS receiver, therefore, the system cost is greatly reduced. In addition, the realization of the invention can completely break away GPS, therefore, the synchronization among all the base stations can be still ensured when the GPS fails. The invention also discloses a device for realizing the synchronization of the base station and a relevant basestation.
Description
Technical field
The present invention relates to the simultaneous techniques in the mobile communication system, relate in particular to a kind of method, device and a kind of relevant base station that realizes base station synchronization in the mobile communication system.
Background technology
In mobile communication system, have only to keep between each base station could realizing the functions such as switching of user between each base station synchronously.System is an example with time division duplex (TDD), in each base station, a subframe numbers (SUBSFN) counter is arranged all, this counter every 5 milliseconds of countings once, cycle count in 0～8191.System Frame Number (SFN, System Frame Number) is half of SUBSFN count frequency.Because SUBSFN adds up by fixing 5 ms intervals, so the base station adopts the method for SUBSFN counting to identify different time points.Between the so-called base station synchronously, it is identical and SFN is also identical to put the time slot of each base station at one time.For the base station, if SUBSFN has alignd, then SFN has also just alignd.
Fig. 1-1 shows the nonsynchronous situation of each base station time slot, and at point at the same time, base station 1 is different with the time slot of base station 2.Fig. 1-2 shows each base station time slot synchronously but the nonsynchronous situation of SFN, and at point at the same time, base station 1 is identical with the time slot of base station 2, but SFN differs 10.Fig. 1-3 shows the situation of each base station synchronization, and at point at the same time, the time slot of base station 1 and base station 2 is identical and SFN is also identical.
At present, for realizing the synchronous of all basic station over network, need all dispose global positioning system (GPS) receiver in each base station.Can obtain the pulse of GPS standard time clock by the GPS receiver, frequency division is carried out in pulse to described GPS standard time clock then, produces the clock pulse of 10ms.Each base station is unified in the rising edge of described 10ms clock pulse or the trailing edge SFN counting to this base station.Each base station can obtain the SFN of this base station at the pulse edge that the GPS standard time reports according to identical formula.
Because the GPS receiver can receive precise time information, therefore can guarantee the time slot and the SFN strict synchronism of SFN counter in each base station of the whole network, thereby realize the synchronous of all basic station over network.
As can be seen, though in each base station all GP configuring S receiver can realize all basic station over network synchronously, GP configuring S receiver is all wanted in each base station, needs the GPS receiver of backup sometimes even also, makes the cost of system also increase substantially.In addition, in case GPS breaks down and surpass the fault time that allows, then all basic station over network all can't operate as normal.
Summary of the invention
In view of this, the technical problem that the present invention solves provides a kind of method that realizes base station synchronization, adopts this method not need all to want GP configuring S receiver for each base station, thereby greatly reduces system cost.Adopt this method, can also solve since the base station that fault caused of GPS can't operate as normal problem.
Another technical problem to be solved by this invention provides a kind of device of realizing base station synchronization.The present invention also provides a kind of relevant base station.
For this reason, technical scheme provided by the invention is as follows:
A kind of method that realizes base station synchronization comprises:
First base station is determined according to the indication information that other base station sends in second base station;
The descending pilot frequency time slot DwPTS position of described first base station of second base station search, and by the search the DwPTS position adjust its DwPTS position;
SFN is read in second base station from the broadcast of described first base station, and its SFN is updated to the SFN that reads.
Wherein, further comprise:
When a plurality of indication information, the priority of each pairing base station of indication information is determined in second base station, and selects the highest base station of priority as first base station.
Wherein, further comprise:
After second base station is updated to the SFN that reads with its SFN, send indication information by broadcast, indicating this base station is first base station.
Wherein, further comprise:
After second base station was updated to the SFN that reads with its SFN, certain interval of time was searched for the DwPTS position of described first base station once more, and adjusted its DwPTS position by the DwPTS position of search once more.
Wherein, further comprise:
Second base station is read SFN, and its SFN is updated to the SFN that reads after adjusting its DwPTS position by the DwPTS position of search once more from the broadcast of described first base station.
Preferably, described first base station is calculated its SFN and is obtained gap information by the temporal information of receiving world locational system GPS.
Preferably, the DwPTS position of described first base station is determined in second base station by the descending synchronous code of searching for described first base station.
Wherein, further comprise:
Second base station search obtains the distance between itself and described first base station behind the DwPTS position of described first base station from pre-configured information, signal calculated propagates into the needed time delay in second base station from described first base station;
The described time delay that moves forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
Preferably, second base station receives the broadcast that first base station sends at the time slot 0 of setting frame.
Preferably, the frame of described setting is the continuous frames of a plurality of SFN.
A kind of device of realizing base station synchronization provided by the invention comprises:
The indication judging unit is used to judge whether second base station receives the indication information that other base station sends, and when receiving indication information in second base station, exports the base station information of described indication information correspondence;
The first base station determining unit is used to receive the information that the indication judging unit is exported, and determines that relevant base station is first base station;
The time slot search unit is used to search for the descending pilot frequency time slot DwPTS position of described first base station;
The time slot adjustment unit is used for adjusting by the DwPTS position of time slot search unit search the DwPTS position of second base station;
The frame number adjustment unit is used for reading SFN from the broadcast of described first base station, upgrades the SFN of second base station by the described SFN that reads.
Wherein, between the indication judging unit and the first base station determining unit, also be connected with the priority judging unit, be used for determining the priority of each base station when the indication judging unit is exported a plurality of base station information, the information of the base station that output priority is the highest is given the first base station determining unit.
Wherein, also comprise:
The indication transmitting element is used for sending indication information by broadcast after the frame number adjustment unit is updated to the SFN that reads with the SFN of second base station, and indicating second base station is first base station.
Wherein, also comprise:
The slot cycle search unit is used for after the frame number adjustment unit is updated to the SFN that reads with the SFN of second base station, and certain interval of time is searched for the DwPTS position of described first base station once more;
The slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of second base station.
Preferably, the DwPTS position of described first base station is determined in the time slot search unit by the descending synchronous code of searching for described first base station.
Wherein, also comprise:
Distance acquiring unit is used in the time slot search unit searches obtaining the distance between second base station and described first base station from pre-configured information behind the DwPTS position of described first base station;
Delay calculation unit is used for propagating into the needed time delay in second base station according to the distance calculation signal that distance acquiring unit obtains from described first base station;
Time slot switching point unit, the described time delay that is used for moving forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
Preferably, the frame number adjustment unit receives the broadcast that first base station sends at the time slot 0 of setting frame.
A kind of base station provided by the invention comprises:
The indication judging unit is used to judge whether this base station receives the indication information that other base station sends, and when receiving indication information in described base station, exports the base station information of described indication information correspondence;
The first base station determining unit is used to receive the information that the indication judging unit is exported, and determines that relevant base station is first base station;
The time slot search unit is used to search for the descending pilot frequency time slot DwPTS position of described first base station;
The time slot adjustment unit is used for adjusting by the DwPTS position of time slot search unit search the DwPTS position of this base station;
The frame number adjustment unit is used for reading SFN from the broadcast of described first base station, upgrades the SFN of this base station by the described SFN that reads.
Wherein, between the indication judging unit and the first base station determining unit, also be connected with the priority judging unit, be used for determining the priority of each base station when the indication judging unit is exported a plurality of base station information, the information of the base station that output priority is the highest is given the first base station determining unit.
Wherein, also comprise:
The indication transmitting element is used for sending indication information by broadcast after the frame number adjustment unit is updated to the SFN that reads with the SFN of this base station, and indicating this base station is first base station.
Wherein, also comprise:
The slot cycle search unit is used for after the frame number adjustment unit is updated to the SFN that reads with the SFN of this base station, and certain interval of time is searched for the DwPTS position of described first base station once more;
The slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of this base station.
Preferably, the DwPTS position of described first base station is determined in the time slot search unit by the descending synchronous code of searching for described first base station.
Wherein, also comprise:
Distance acquiring unit is used in the time slot search unit searches obtaining the distance between this base station and described first base station from pre-configured information behind the DwPTS position of described first base station;
Delay calculation unit is used for propagating into the needed time delay in this base station according to the distance calculation signal that distance acquiring unit obtains from described first base station;
Time slot switching point unit, the described time delay that is used for moving forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
Preferably, the frame number adjustment unit receives the broadcast that first base station sends at the time slot 0 of setting frame.
In the present invention, the DwPTS position of search first base station is passed through in second base station, and adjusts its DwPTS position by the DwPTS position of search, can set up the slot synchronization between second base station and first base station; Second base station is by reading SFN from the broadcast of described first base station, and its SFN is updated to the SFN that reads, and can set up the frame synchronization between second base station and first base station.Like this, realized between the different base station synchronously, the rest may be inferred, just can realize the synchronous of all basic station over network, and not need all to want GP configuring S receiver for each base station, thereby greatly reduce system cost.
It can also be seen that because realization of the present invention can break away from GPS fully, therefore, when the GPS fault, still can guarantee between each base station synchronously.
Description of drawings
Fig. 1-the 1st, the nonsynchronous schematic diagram of each base station time slot;
Fig. 1-2 be each base station time slot synchronously but the nonsynchronous schematic diagram of SFN;
Fig. 1-the 3rd, the schematic diagram of each base station synchronization;
Fig. 2 is a schematic diagram of mobile communications network;
Fig. 3 is that reference base station and Reference BTS are set up synchronous flow chart among the present invention;
Fig. 4 is the schematic representation of apparatus of realization base station synchronization provided by the invention;
Fig. 5 is the schematic diagram of a kind of base station provided by the invention.
Embodiment
At present, each base station all as a reference with GPS, thereby realize all basic station over network synchronously.And basic thought of the present invention is, with the time slot of some base stations and SFN as standard, time slot and SFN that this base station is all adjusted with reference to the time slot and the SFN of this base station in other base station, thus realize the synchronous purpose of all basic station over network.
Wherein, can be called Reference BTS, need the base station of reference data base station adjustment self time slot and SFN can be called reference base station as the base station of quilt reference.Reference BTS can obtain gap information and calculate the SFN of this base station by receiving the temporal information of GPS.Reference BTS even also can adopt a crystal oscillator with high stability is with the time slot of determining this base station and calculate the SFN of this base station.
Fig. 2 shows a mobile communications network, comprises 3 base stations (base station 1, base station 2, base station 3) and a radio network controller (RNC) in this network.
Base station 1, base station 2 and base station 3 be adjacent base station each other, and the distance between base station 1 and the base station 2 is d12, and the distance between base station 1 and the base station 3 is d13, and the distance between base station 2 and the base station 3 is d23.
Wherein, base station 1 is as Reference BTS, and base station 2, base station 3 are all as with reference to the base station.Base station 2, base station 3 all need to adjust own time slot and SFN according to the time slot of base station 1 and SFN, thereby make base station 2, base station 3 all synchronous with base station 1, realize synchronous between all basic station over network.
For realize between all basic station over network synchronously, need to determine which base station be a Reference BTS, which base station is a reference base station.Can increase relevant indication information, thereby make the base station know which base station is a Reference BTS according to the indication information in the configuration information in the configuration information of each base station, which base station is a reference base station.But the flexibility of this method is not enough, especially when Reference BTS changes, needs to upgrade the configuration information of all base stations, is unfavorable for actual application like this.
Another kind method is, increases indication information in broadcast, and like this, the indication information in the broadcast that each base station can send by other base station learn whether this base station is Reference BTS.
As Reference BTS, owing to do not need therefore concerning Reference BTS, only in broadcast, to increase an indication information and get final product according to the time slot of other base station and the time slot and the SFN of SFN adjustment self.
As the reference base station, owing to need the time slot of reference data base station and time slot and the SFN that SFN adjusts self, therefore concerning reference base station, its course of work is changed to some extent.
Can set up slot synchronization with Reference BTS for making reference base station, reference base station needs to determine by the descending synchronous code (SYNC_DL) of search Reference BTS the descending pilot frequency time slot (DwPTS) of Reference BTS after startup, and then the slot synchronization of foundation and Reference BTS.
For making those skilled in the art understand the present invention better, method provided by the invention is further described in detail below in conjunction with specific embodiment.Fig. 3 is that reference base station and Reference BTS are set up synchronous flow chart.
In step 301, after reference base station starts, receive the broadcast that other base station sends.
In step 302, reference base station determines that according to the indication information in the broadcast which base station is a Reference BTS.
When a plurality of indication information, reference base station should at first be determined the priority of each pairing base station of indication information, selects the highest base station of priority as Reference BTS then.
Wherein, the Determination of priority of each base station can be set according to specific requirement.For example: the Reference BTS that the distance reference base station is near more, its priority is high more; Perhaps, the Reference BTS of GP configuring S receiver, its priority is higher than the not Reference BTS of GP configuring S receiver.
In step 303, the SYNC_DL of reference base station search Reference BTS and the DwPTS of definite Reference BTS.
Reference base station can be used for reference characteristics window that user terminal often adopts, coherent detection method or other disclosed method, searches for the SYNC_DL of Reference BTS and determines the DwPTS of Reference BTS.Because characteristics window, coherent detection method all are the technological means of habitually practising, and repeat no more here.
In step 304, reference base station is adjusted into the DwPTS of this base station consistent with the DwPTS of Reference BTS, to set up and the slot synchronization of Reference BTS.
Need to prove, as long as it is consistent with the DwPTS of Reference BTS that reference base station is adjusted into self DwPTS, because the regulation of frame structure, correspondingly, just can guarantee that also reference base station is also all consistent on other time slot with Reference BTS, thereby set up the slot synchronization of reference base station and Reference BTS.
In step 305, reference base station receives the broadcast that Reference BTS sends at the time slot 0 (TS0) of particular frame.
According to the requirement of present agreement, time slot TS0 should be used to send broadcast, and should not be used for reception information.Therefore, need make amendment, make reference base station in the frame of some specific SFN, can receive information at time slot TS0 to the relevant setting of reference base station.Time slot TS0 can be arranged to a kind of configurable common time slot (is similar to time slot TS2～TS6), when practical application, can be configured time slot TS0 on request, thereby makes the base station receive information at time slot TS0.
For making reference base station can receive the broadcast that Reference BTS sends reliably, can make reference base station receive the broadcast that Reference BTS sends at the continuous a plurality of frames of specific SFN.For example, can make reference base station in SFN is 2032～2047 frame, receive the broadcast that Reference BTS sends.
In step 306, reference base station reads the SFN in the broadcast, and the SFN of this base station is updated to the described SFN that reads, thus the frame synchronization of foundation and Reference BTS.
If the transmission time slot of broadcasting at interval (TTI) is 20 milliseconds, then the base station can encode, interweave, cut apart etc. broadcast, sends broadcast by 2 frames (4 subframes) then.In this case, UE only receives the information of 4 subframes, just can solve broadcast and read corresponding SFN in the broadcast.
So far, reference base station has been set up slot synchronization and the frame synchronization with Reference BTS, thus realized with Reference BTS synchronously.If reference base station all in the whole network have all been set up synchronously with Reference BTS, also just realized the synchronous of all basic station over network.
In conjunction with Fig. 2, above-mentioned flow process is illustrated in greater detail.In Fig. 2, base station 1 is for disposing the Reference BTS of GPS receiver, and base station 2, base station 3 are reference base station.
After base station 1 starts, will send indication information by broadcast, so that other base station (base station 2 and base station 3) learns that this base station is a Reference BTS.
Base station 1 can obtain the pulse of GPS standard time clock by the GPS receiver, frequency division is carried out in pulse to described GPS standard time clock then, produce the clock pulse of 10ms, and at the rising edge of described 10ms clock pulse or the trailing edge SFN counting to this base station, and obtain corresponding time slot.
After 2/ base station 3, base station starts, also will begin SFN counting, and obtain corresponding time slot this base station.After the broadcast of base station 1 is received in 2/ base station 3, base station, read indication information wherein, learn that base station 1 is Reference BTS.Then, the SYNC_DL of search base station 1 is also determined the position of the DwPTS of base station 1 in 2/ base station 3, base station.After searching the DwPTS position of base station 1,2/ base station 3, base station can be arranged on the position identical with the DwPTS of base station 1 with the DwPTS of this base station, to set up the slot synchronization of this base station and base station 1.
After setting up slot synchronization, 2/ base station 3, base station also will receive the broadcast that base station 1 sends in the time slot TS0 of particular frame (be as SFN 20～30 frame).
2/ base station 3, base station is to receive the broadcast that base station 1 sends in 20～30 the frame at SFN, and to behind the SFN that reads base station 1, and the SFN of this base station is updated to described SFN, can set up the frame synchronization with base station 1.So far, finished the synchronous of 2/ base station 3, base station and base station 1.
The synchronous of all basic station over network also just realized after all setting up synchronously with base station 1 in base station 2, base station 3.
In the above-described embodiments, in step 303, reference base station has just been determined the position of the DwPTS of Reference BTS, and does not determine the time slot switching point more accurately.In actual applications, behind the position of the DwPTS that determines Reference BTS, reference base station can also be determined the time slot switching point more accurately.
Concrete grammar comprises:
In each base station, preserve the distance of this base station and adjacent base station in advance;
After reference base station is determined the DwPTS position of Reference BTS, from pre-configured range information, obtain between itself and the Reference BTS apart from d.Wherein, the unit of d is a rice (m).
By calculating t=d/300, picked up signal propagates into the needed time t of reference base station from Reference BTS.Wherein, the unit of t is microsecond (us).
DwPTS position reach t from Reference BTS obtains corresponding time slot switching point.
In conjunction with Fig. 2 more particularly, in base station 1, preserve in advance between base station 1 and the base station 2 apart between d12, base station 1 and the base station 3 apart from d13, in base station 2, preserve between base station 2 and the base station 1 apart between d12, base station 2 and the base station 3 apart from d23, in base station 3, preserve between base station 3 and the base station 1 apart between d13, base station 3 and the base station 2 apart from d23.
After the DwPTS position of base stations 1 is determined in base station 2, can from pre-configured information, obtain between itself and the base station 1 apart from d12.Then, calculate t=d12/300, and from the base station 1 DwPTS position reach t, can obtain corresponding time slot switching point.
Base station 3 in like manner repeats no more here.
In the above-described embodiments, illustrated that reference base station starts after, realize and the synchronous process of Reference BTS.When system normally moves because the clock system that use each base station there are differences, therefore behind system's long-play, reference base station possibly with Reference BTS generation step-out.For this reason, reference base station periodically all should be carried out once " calibration " at set intervals,, carries out once the synchronizing process with Reference BTS once more that is.
The synchronizing process of carrying out can only be carried out slot synchronization once more, perhaps also can not only carry out slot synchronization but also carry out frame synchronization.Above slot synchronization and frame synchronization are illustrated, repeat no more here.
In mobile communication network, possible Reference BTS seldom, and reference base station is a lot.Can adopt a kind of method, under the Reference BTS condition of limited, make the more reference base station can be synchronous with Reference BTS.
This method is exactly: make with Reference BTS and realize that synchronous reference base station becomes new Reference BTS, thereby the adjacent reference base station of this new Reference BTS can be carried out with this new Reference BTS synchronously.For realizing this method,, make reference base station send corresponding indication information and get final product, so that other base station can learn that this base station is a Reference BTS by broadcast as long as after setting up frame synchronization with Reference BTS.By this method, can derive unlimited a plurality of Reference BTSs, realize synchronously until all basic station over network from limited Reference BTS.
As can be seen, utilize method of the present invention, even GPS breaks down, Reference BTS still can obtain synchronizing signal from adjacent base station, to keep the operate as normal of base station.And certain base station can not stop the transmission of this sub-district DwPTS when the broadcasting of reading other base station, and terminal can be by finishing DwPTS to the measurement of base station.
In addition, for the base station of indoor covering, can take out separately No. one antenna be placed on outdoor, only as reception antenna, the signal at grand station around receiving.Like this, just do not need all antennas all periodically to be set to receive, thereby avoided bigger modification, even avoided modification agreement to the base station at time slot TS0.
Based on said method, the present invention also provides a kind of device of realizing base station synchronization, and Fig. 4 is this schematic representation of apparatus.The device of realizing base station synchronization comprises: indication judging unit S41, the first base station determining unit S42, time slot search cell S 43, time slot adjustment unit S44 and frame number adjustment unit S45.
After reference base station starts, receive the broadcast that other base station sends.Indication judging unit S41 will judge in the broadcast that reference base station receives whether have indication information.If there is an indication information in the broadcast, indication judging unit S41 will export the information of the base station corresponding with this indication information and give the first base station determining unit S42.The first base station determining unit S42 receives the information of indication judging unit S41 output, determines that relevant base station is a Reference BTS.
When a plurality of indication information, should at first determine the priority of each pairing base station of indication information, select the highest base station of priority as Reference BTS then.In this case, this device should increase a priority judging unit between the indication judging unit S41 and the first base station determining unit S42, be used for when indication judging unit S41 exports a plurality of base station information, determine the priority of each base station, the information of the base station that output priority is the highest is given the first base station determining unit S42.
Wherein, the Determination of priority of each base station can be set according to specific requirement.For example: the Reference BTS that the distance reference base station is near more, its priority is high more; Perhaps, the Reference BTS of GP configuring S receiver, its priority is higher than the not Reference BTS of GP configuring S receiver.
After the first base station determining unit S42 determines Reference BTS, time slot search cell S 43 will be searched for the DwPTS position of Reference BTS.Wherein, time slot search cell S 43 will be determined the DwPTS of Reference BTS by the SYNC_DL of search Reference BTS.
Can use for reference characteristics window that user terminal often adopts, coherent detection method or other disclosed method, search for the SYNC_DL of Reference BTS and determine the DwPTS of Reference BTS.Because characteristics window, coherent detection method all are the technological means of habitually practising, and repeat no more here.
After the DwPTS of reference base station is adjusted in the position that time slot adjustment unit S44 presses the DwPTS of time slot search unit S43 search, can realize the slot synchronization of reference base station and Reference BTS.
After reference base station and Reference BTS are set up slot synchronization, just can receive the broadcast that Reference BTS sends at the TS0 of particular frame.For making reference base station can receive the broadcast that Reference BTS sends reliably, can make reference base station receive the broadcast that Reference BTS sends at the continuous a plurality of frames of specific SFN.
After reference base station receives the broadcast of Reference BTS transmission, frame number adjustment unit S45 can read the SFN of Reference BTS from described broadcast, and upgrade the SFN of reference base station by the described SFN that reads, to realize the frame synchronization between reference base station and the Reference BTS.
So far, reference base station has been set up slot synchronization and the frame synchronization with Reference BTS, thus realized with Reference BTS synchronously.If reference base station all in the whole network have all been set up synchronously with Reference BTS, also just realized the synchronous of all basic station over network.
In the above-described embodiments, time slot search cell S 43 has just been determined the position of the DwPTS of Reference BTS, and does not determine the time slot switching point more accurately.In actual applications, behind the position of the DwPTS that determines Reference BTS, can also determine the time slot switching point more accurately.In this case, this device also should comprise: distance acquiring unit, delay calculation unit and time slot switching point unit.
Distance acquiring unit is used for after time slot search cell S 43 searches the DwPTS position of Reference BTS, from pre-configured information, obtain between reference base station and the Reference BTS apart from d.Wherein, the unit of d is a rice.
According to distance acquiring unit obtain apart from d, delay calculation unit can be by calculating t=d/300, picked up signal propagates into the needed time delay t of reference base station from Reference BTS.Wherein, the unit of t is a microsecond.
Time slot switching point unit can obtain corresponding time slot switching point with the DwPTS position reach t of Reference BTS.
In device shown in Figure 4, illustrated that reference base station starts after, realize and the synchronous process of Reference BTS.When system normally moves because the clock system that use each base station there are differences, therefore behind system's long-play, reference base station possibly with Reference BTS generation step-out.For this reason, can periodically all should carry out once " calibration " at set intervals, that is, once carry out the synchronizing process of reference base station and Reference BTS once more.
The synchronizing process of carrying out can only be carried out slot synchronization once more, perhaps also can not only carry out slot synchronization but also carry out frame synchronization.
If the subsynchronous again slot synchronization of only carrying out then also should increase slot cycle search unit and slot cycle adjustment unit in device shown in Figure 4.The slot cycle search unit is used for after frame number adjustment unit S45 is updated to the SFN that reads with the SFN of reference base station, certain interval of time is searched for the DwPTS position of Reference BTS once more, and the slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of reference base station.
If subsynchronously more not only carry out slot synchronization but also carry out frame synchronization, then after the slot cycle adjustment unit was adjusted the DwPTS position of reference base station periodically, the SFN that makes frame number adjustment unit S45 correspondingly adjust reference base station got final product, and repeats no more here.
In mobile communication network, possible Reference BTS seldom, and reference base station is a lot.Can be under the Reference BTS condition of limited, make the more reference base station can be synchronous with Reference BTS.For achieving this end, in device shown in Figure 4, also should increase an indication transmitting element, be used for after frame number adjustment unit S45 is updated to the SFN that reads with the SFN of reference base station, send indication information by broadcast, indicating this reference base station is Reference BTS.
Based on method provided by the invention, the present invention also provides a kind of relevant base station, Fig. 5 is the schematic diagram of this base station, and this base station comprises: indication judging unit S51, the first base station determining unit S52, time slot search cell S 53, time slot adjustment unit S54 and frame number adjustment unit S55.
Described base station initiated after, receive the broadcast that other base station sends.Indication judging unit S51 will judge whether there is indication information in the broadcast of receiving this base station.If there is an indication information in the broadcast, indication judging unit S41 will export the information of the base station corresponding with this indication information and give the first base station determining unit S52.The first base station determining unit S52 receives the information of indication judging unit S51 output, determines that relevant base station is a Reference BTS.
When a plurality of indication information, should at first determine the priority of each pairing base station of indication information, select the highest base station of priority as Reference BTS then.In this case, this base station should increase a priority judging unit between the indication judging unit S51 and the first base station determining unit S52, be used for when indication judging unit S51 exports a plurality of base station information, determine the priority of each base station, the information of the base station that output priority is the highest is given the first base station determining unit S52.
Wherein, the Determination of priority of each base station can be set according to specific requirement.For example: the Reference BTS that the distance reference base station is near more, its priority is high more; Perhaps, the Reference BTS of GP configuring S receiver, its priority is higher than the not Reference BTS of GP configuring S receiver.
After the first base station determining unit S52 determines Reference BTS, time slot search cell S 53 will be searched for the DwPTS position of Reference BTS.Wherein, time slot search cell S 53 will be determined the DwPTS of Reference BTS by the SYNC_DL of search Reference BTS.
Can use for reference characteristics window that user terminal often adopts, coherent detection method or other disclosed method, search for the SYNC_DL of Reference BTS and determine the DwPTS of Reference BTS.Because characteristics window, coherent detection method all are the technological means of habitually practising, and repeat no more here.
After time slot adjustment unit S54 adjusts the DwPTS of this base station by the position of the DwPTS of time slot search unit S53 search, can realize the slot synchronization of described base station and Reference BTS.
After described base station and Reference BTS are set up slot synchronization, just can receive the broadcast that Reference BTS sends at the TS0 of particular frame.For making described base station can receive the broadcast that Reference BTS sends reliably, can make reference base station receive the broadcast that Reference BTS sends at the continuous a plurality of frames of specific SFN.
After described base station receives the broadcast of Reference BTS transmission, frame number adjustment unit S55 can read the SFN of Reference BTS from described broadcast, and upgrade the SFN of this base station by the described SFN that reads, to realize the frame synchronization between described base station and the Reference BTS.
So far, slot synchronization and the frame synchronization with Reference BTS has been set up in described base station, thus realized with Reference BTS synchronously.If base stations all in the whole network have all been set up synchronously with Reference BTS, also just realized the synchronous of all basic station over network.
In the above-described embodiments, time slot search cell S 53 has just been determined the position of the DwPTS of Reference BTS, and does not determine the time slot switching point more accurately.In actual applications, behind the position of the DwPTS that determines Reference BTS, can also determine the time slot switching point more accurately.In this case, described base station also should comprise: distance acquiring unit, delay calculation unit and time slot switching point unit.
Distance acquiring unit is used for after time slot search cell S 53 searches the DwPTS position of Reference BTS, from pre-configured information, obtain between this base station and the Reference BTS apart from d.Wherein, the unit of d is a rice.
According to distance acquiring unit obtain apart from d, delay calculation unit can be by calculating t=d/300, picked up signal propagates into the needed time delay t in this base station from Reference BTS.Wherein, the unit of t is a microsecond.
Time slot switching point unit can obtain corresponding time slot switching point with the DwPTS position reach t of Reference BTS.
In base station shown in Figure 5, illustrated described base station initiated after, realize and the synchronous process of Reference BTS.When system normally moves because the clock system that use each base station there are differences, therefore behind system's long-play, described base station possibly with Reference BTS generation step-out.For this reason, can periodically all should carry out once " calibration " at set intervals, that is, once carry out the synchronizing process of described base station and Reference BTS once more.
The synchronizing process of carrying out can only be carried out slot synchronization once more, perhaps also can not only carry out slot synchronization but also carry out frame synchronization.
If the subsynchronous again slot synchronization of only carrying out then also should increase slot cycle search unit and slot cycle adjustment unit in base station shown in Figure 5.The slot cycle search unit is used for after frame number adjustment unit S55 is updated to the SFN that reads with the SFN of this base station, certain interval of time is searched for the DwPTS position of Reference BTS once more, and the slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of this base station.
If subsynchronously more not only carry out slot synchronization but also carry out frame synchronization, then after the slot cycle adjustment unit was adjusted the DwPTS position of reference base station periodically, the SFN that makes frame number adjustment unit S55 correspondingly adjust this base station got final product, and repeats no more here.
In mobile communication network, possible Reference BTS seldom.Under the Reference BTS condition of limited, for making the more base station can be synchronous with Reference BTS, in base station shown in Figure 5, also should increase an indication transmitting element, be used for after frame number adjustment unit S55 is updated to the SFN that reads with the SFN of reference base station, send indication information by broadcast, indicating this base station is Reference BTS.
By described disclosed embodiment, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (24)
1. a method that realizes base station synchronization is characterized in that, comprising:
First base station is determined according to the indication information that other base station sends in second base station;
The descending pilot frequency time slot DwPTS position of described first base station of second base station search, and by the search the DwPTS position adjust its DwPTS position;
Second base station is reading system frame number SFN from the broadcast of described first base station, and its SFN is updated to the described SFN that reads.
2. the method for claim 1 is characterized in that, further comprises:
When a plurality of indication information, the priority of each pairing base station of indication information is determined in second base station, and selects the highest base station of priority as first base station.
3. the method for claim 1 is characterized in that, further comprises:
After second base station is updated to the SFN that reads with its SFN, send indication information by broadcast, indicating this base station is first base station.
4. the method for claim 1 is characterized in that, further comprises:
After second base station was updated to the SFN that reads with its SFN, certain interval of time was searched for the DwPTS position of described first base station once more, and adjusted its DwPTS position by the DwPTS position of search once more.
5. method as claimed in claim 4 is characterized in that, further comprises:
After its DwPTS position is adjusted by the DwPTS position of search once more in second base station, reading system frame number SFN from the broadcast of described first base station, and its SFN is updated to the described SFN that reads.
6. as any described method of claim 1 to 5, it is characterized in that described first base station is calculated its SFN and obtained gap information by the temporal information of receiving world locational system GPS.
7. as any described method of claim 1 to 5, it is characterized in that the DwPTS position of described first base station is determined in second base station by the descending synchronous code of searching for described first base station.
8. as any described method of claim 1 to 5, it is characterized in that, further comprise:
Second base station search obtains the distance between itself and described first base station behind the DwPTS position of described first base station from pre-configured information, signal calculated propagates into the needed time delay in second base station from described first base station;
The described time delay that moves forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
9. as any described method of claim 1 to 5, it is characterized in that second base station receives the broadcast that first base station sends at the time slot 0 of setting frame.
10. method as claimed in claim 9 is characterized in that, the frame of described setting is the continuous frames of a plurality of SFN.
11. a device of realizing base station synchronization is characterized in that, comprising:
The indication judging unit is used to judge whether second base station receives the indication information that other base station sends, and when receiving indication information in second base station, exports the base station information of described indication information correspondence;
The first base station determining unit is used to receive the information that the indication judging unit is exported, and determines that relevant base station is first base station;
The time slot search unit is used to search for the descending pilot frequency time slot DwPTS position of described first base station;
The time slot adjustment unit is used for adjusting by the DwPTS position of time slot search unit search the DwPTS position of second base station;
The frame number adjustment unit is used for the broadcast reading system frame number SFN from described first base station, upgrades the SFN of second base station by the described SFN that reads.
12. device as claimed in claim 11, it is characterized in that, between the indication judging unit and the first base station determining unit, also be connected with the priority judging unit, be used for when the indication judging unit is exported a plurality of base station information, determine the priority of each base station, the information of the base station that output priority is the highest is given the first base station determining unit.
13. device as claimed in claim 11 is characterized in that, also comprises:
The indication transmitting element is used for sending indication information by broadcast after the frame number adjustment unit is updated to the SFN that reads with the SFN of second base station, and indicating second base station is first base station.
14. device as claimed in claim 11 is characterized in that, also comprises:
The slot cycle search unit is used for after the frame number adjustment unit is updated to the SFN that reads with the SFN of second base station, and certain interval of time is searched for the DwPTS position of described first base station once more;
The slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of second base station.
15., it is characterized in that the DwPTS position of described first base station is determined in the time slot search unit by the descending synchronous code of searching for described first base station as any described device of claim 11 to 14.
16. device as claimed in claim 15 is characterized in that, also comprises:
Distance acquiring unit is used in the time slot search unit searches obtaining the distance between second base station and described first base station from pre-configured information behind the DwPTS position of described first base station;
Delay calculation unit is used for propagating into the needed time delay in second base station according to the distance calculation signal that distance acquiring unit obtains from described first base station;
Time slot switching point unit, the described time delay that is used for moving forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
17., it is characterized in that the frame number adjustment unit receives the broadcast that first base station sends at the time slot 0 of setting frame as any described device of claim 11 to 14.
18. a base station is characterized in that, comprising:
The indication judging unit is used to judge whether this base station receives the indication information that other base station sends, and when receiving indication information in described base station, exports the base station information of described indication information correspondence;
The first base station determining unit is used to receive the information that the indication judging unit is exported, and determines that relevant base station is first base station;
The time slot search unit is used to search for the descending pilot frequency time slot DwPTS position of described first base station;
The time slot adjustment unit is used for adjusting by the DwPTS position of time slot search unit search the DwPTS position of this base station;
The frame number adjustment unit is used for the broadcast reading system frame number SFN from described first base station, upgrades the SFN of this base station by the described SFN that reads.
19. base station as claimed in claim 18, it is characterized in that, between the indication judging unit and the first base station determining unit, also be connected with the priority judging unit, be used for when the indication judging unit is exported a plurality of base station information, determine the priority of each base station, the information of the base station that output priority is the highest is given the first base station determining unit.
20. base station as claimed in claim 18 is characterized in that, also comprises:
The indication transmitting element is used for sending indication information by broadcast after the frame number adjustment unit is updated to the SFN that reads with the SFN of this base station, and indicating this base station is first base station.
21. base station as claimed in claim 18 is characterized in that, also comprises:
The slot cycle search unit is used for after the frame number adjustment unit is updated to the SFN that reads with the SFN of this base station, and certain interval of time is searched for the DwPTS position of described first base station once more;
The slot cycle adjustment unit is used for adjusting by the DwPTS position of time slot cycle search unit search the DwPTS position of this base station.
22., it is characterized in that the DwPTS position of described first base station is determined in the time slot search unit by the descending synchronous code of searching for described first base station as any described base station of claim 18 to 21.
23. as any described base station of claim 18 to 21, it is characterized in that, also comprise:
Distance acquiring unit is used in the time slot search unit searches obtaining the distance between this base station and described first base station from pre-configured information behind the DwPTS position of described first base station;
Delay calculation unit is used for propagating into the needed time delay in this base station according to the distance calculation signal that distance acquiring unit obtains from described first base station;
Time slot switching point unit, the described time delay that is used for moving forward from the DwPTS position of described first base station obtains corresponding time slot switching point.
24., it is characterized in that the frame number adjustment unit receives the broadcast that first base station sends at the time slot 0 of setting frame as any described base station of claim 18 to 21.
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| CN2007101214474A CN101384019B (en) | 2007-09-06 | 2007-09-06 | Method, apparatus implementing base station synchronization and base station |
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| CN2007101214474A CN101384019B (en) | 2007-09-06 | 2007-09-06 | Method, apparatus implementing base station synchronization and base station |
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| CN101841904B (en) * | 2009-03-20 | 2014-03-12 | 中兴通讯股份有限公司 | Null interface synchronization method and system of home node base station |
| CN102111868A (en) * | 2009-12-29 | 2011-06-29 | 电信科学技术研究院 | Null interface synchronization method and base station |
| CN102421087B (en) * | 2010-09-28 | 2015-10-21 | 中兴通讯股份有限公司 | A kind of System Frame Number update method and system |
| CN102547961B (en) | 2010-12-10 | 2016-06-08 | 华为技术有限公司 | The method of synchronization among base stations, Apparatus and system |
| CN102651656B (en) | 2011-02-25 | 2014-03-12 | 华为技术有限公司 | Signal processing method, device and system based on twisted pairs |
| CN102740446B (en) * | 2011-04-12 | 2017-06-06 | 上海无线通信研究中心 | The air interface synchronization method of multipoint cooperative in a kind of TDD distributed networks |
| CN103024795B (en) * | 2011-09-27 | 2015-08-05 | 鼎桥通信技术有限公司 | The detection method of synchronization timing exception in a kind of TD-SCDMA |
| CN104186014B (en) | 2013-02-18 | 2018-08-21 | 华为技术有限公司 | A kind of method and device that net cast synchronizes |
| CN104079392B (en) * | 2013-03-29 | 2019-01-04 | 中兴通讯股份有限公司 | A kind of method, equipment and the system of Transmission system frame number information |
| CN104735769A (en) * | 2013-12-18 | 2015-06-24 | 中兴通讯股份有限公司 | System frame number synchronization method, device and system |
| CN105960820B (en) * | 2014-10-31 | 2019-05-24 | 华为技术有限公司 | A kind of synchronizing device and method |
| CN114114325B (en) * | 2021-04-22 | 2022-07-22 | 中国电信股份有限公司 | Calibration method, device and system |
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