CN1578483A - Base station group control system and realizing method thereof - Google Patents
Base station group control system and realizing method thereof Download PDFInfo
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- CN1578483A CN1578483A CN 03139993 CN03139993A CN1578483A CN 1578483 A CN1578483 A CN 1578483A CN 03139993 CN03139993 CN 03139993 CN 03139993 A CN03139993 A CN 03139993A CN 1578483 A CN1578483 A CN 1578483A
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Abstract
The present invention relates to digital communication system in radio communication field. The base station group control system includes N base stations, each of which includes main controlling CPU, TDMA/TDD processing unit connected to the main controlling CPU, sync processing time sequence unit connected to the TDMA/TDD processing unit, and line interface unit connected with the sync processing time sequence unit. The sync processing time sequence unit is sync optocoupler with wire-ANDing function; and all the base stations are connected via one frame time sequence bus and one ground line led out from the line interface unit for frame time sequence signal transmission. The present invention also provides the method of realizing group control system in the said system. The present invention has the advantages of flexible group control mode, simple wiring, strong expandability and high signal isolating effect between base stations.
Description
Technical field
The present invention relates to a kind of mode that realizes the group of base stations control, be chiefly directed to the digital communication system that wireless communication field uses TDMA (time division multiple access), TDD (time division duplex) mode of operation, such as the group prosecutor formula of base station in PHS (personal portable telephone system) system.
Background technology
At present, the PHS system is widely used, and in the face of ever-increasing number of users, need correspondingly provide more Traffic Channel for using.One of method that addresses this problem is to use group control base station---and be about to single base station " binding " use of a plurality of routines, their share control channel (CCH), and remaining channel all is used for traffic use.Compared with the quantity of the single base station of simple increase, this method can provide more Traffic Channel (TCH).
The main task of group of base stations control be in a plurality of single base stations, realize from base station and a dominant base synchronously, make it to become the group control base station of shared dominant base control channel (CCH).Wherein, dominant base needs the transmit frame synchronizing information; Then to receive the frame synchronization information of dominant base from the base station, the frame sequential when working as oneself with this sequential, finish with dominant base synchronously.
The mode of realization group of base stations of the prior art control mainly contains two kinds: software synchronization mode and hardware synchronization mode.
The software synchronization mode is not have physical connection between each single base station, dominant base is introduced into normal operating conditions, start-up course subsequently, to receive transmitting of dominant base control channel (CCH) from the base station, and judge by searching for UW word (unique word) section of stipulating in its frame format when dominant base sends control information by wireless mode.Find its dominant base to send the moment of Broadcast Control Channel (BCCH) subsequently in all records of its acquisition, which time slot therefrom obtains dominant base control time slot is, adjusts the frame sequential of oneself then, finally reaches synchronous with the complete frame of dominant base.Though this kind mode is relatively freer in the group control configuration of base station, need not to increase hardware connects, but whole synchronizing process will be passed through UW word (unique word) search, base station identity code (CSID) search, three processes of Broadcast Control Channel (BCCH) search, also will repeatedly search for if search is unsuccessful, whole process is comparatively time-consuming.Though another situation be from the base station when starting with dominant base on synchronously, if but dominant base or drift has taken place for some reason from the base station internal clock, will cause the frame clock signal to drift about, in fact the principal and subordinate base station is in the state of lock-out like this, can occur seeing from the base station in operation, but the phenomenon of normal business function can't be provided.
The hardware synchronization mode promptly links to each other with cable between a plurality of base stations, the transmit frame sequential that cable is mainly used in the control channel of dominant base is transferred to from the base station, after dominant base puts into effect, directly obtain dominant base control channel transmit frame sequential from the base station and the frame sequential when working as self, thereby reach the purpose synchronous with dominant base with this.This mode is synchronously reliable and save time, and the incomparable advantage of software synchronization is arranged.The hardware synchronization mode has two kinds of concrete connected modes again:
1, referring to Fig. 1, Fig. 1 is the group control connection diagram of following three the single base stations 11,12,13 of this kind mode.Concrete connected mode is as follows: with base station 11 is example, and master cpu 1101 sends principal and subordinate base station sign to TDMA/TDD processing unit 1102; Interface 1105,1106 is used for receiving or the transmit frame sequential from synchronous sequence processor 1103; Interface 1107,1108 is used for receiving or the transmit frame sequential from line interface unit 1104; Circuit 1109,1110 is used for base station 11 and receives the frame sequential that send base station 12 or 13, and circuit 1111,1112 is used for the frame sequential that base station 11 sends to base station 12 or 13; Wherein, cable 14 and cable 15 are the common ground line between three stylobate stations (11,12,13); The structure of base station 12 and base station 13 is identical with base station 11.As seen from the figure under the situation of three group of base stations controls, for making group of base stations prosecutor formula (master and slave base station can be set arbitrarily) flexibly, all there are four external circuits link to each other with other base stations (except that the ground wire line) at every stylobate station, its shortcoming is when being risen by the base station number of group control, wiring quantity is too many, and internal logic is differentiated also can more complicated, and extensibility is poor.
2, whether be dominant base in single base station of group control if being provided with according to hardware jumper before the group control.A dominant base transmit frame sequential receives only the frame sequential from the base station.Because fixing transmission direction arranged, therefore only needed a transmission line (except that between the base station line) altogether between any two single base stations of group control: promptly be connected to from the base station from dominant base.Line complexity when this method has been simplified the control of many group of base stations, but shortcoming is the group control configuration underaction of base station, and in case by hardware setting, then dominant base just can only be done in certain single base station before the group control, and other single base stations just can only be done from the base station.
In order to overcome the shortcoming of above-mentioned group of prosecutor formula, need a kind of new hardware synchronization group prosecutor formula, have and connect simple, the group control advantage that configuration mode is flexible and extensibility is strong.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming of existing hardware synchronization group prosecutor formula, solve line complexity, the group prosecutor formula underaction of existing hardware synchronization group prosecutor formula existence and can expand not strong problem.The present invention proposes a kind of new group of base stations control system and its implementation, and its principal character is to use corresponding devices the frame sequential transmission line between each single base station to be constituted the mode of " line with "---and the mode of this " bus " makes the group control of base station have that line is few, extensibility good, group control flexible characteristic.
Group of base stations control of the present invention system, comprise N base station, each base station comprises master cpu, the TDMA/TDD processing unit that is connected with described master cpu, the Synchronous Processing timing unit that is connected with described TDMA/TDD processing unit, the line interface unit that is connected with described Synchronous Processing timing unit, it is characterized in that the synchronous sequence processing unit is the synchronous optocoupler that line and function can be provided; Described master cpu is responsible for the sign of master and slave base station is issued; Described TDMA/TDD processing unit is used to produce the frame sequential, and the frame clock signal of the frame clock signal being sent into described synchronous optocoupler or obtaining from described synchronous optocoupler to receive; A frame timing bus of being drawn by described line interface unit between each base station is connected with a ground wire and transmits the frame clock signal.
In above-mentioned group of base stations control system, the synchronous optocoupler of each base station comprises that one receives synchronous optocoupler and one and sends synchronous optocoupler, and the input of the synchronous optocoupler of described reception is connected with the output of the synchronous optocoupler of described transmission.
In said system, the method for realization group control system is
It is dominant base that the first step is provided with arbitrary base station at network side;
The second step dominant base sends the frame clock signal of receiving slot;
The 3rd step is from base station and dominant base frame synchronization;
The 4th step was finished the group control, and normal operation is dropped in group control base station.
Wherein, second step comprised:
1) judges it self is dominant base;
2) put into effect by normal flow;
3) the frame clock signal of correction receiving slot;
4) send the frame clock signal of this base station receiving slot.
The 3rd step comprised:
1) judges from as from the base station;
2) put high level at frame sequential transmitting terminal;
3) wait for that dominant base puts into effect;
4) the frame clock signal of the receiving slot of reception dominant base transmission;
5) finish frame synchronization by the frame clock signal and the dominant base of the dominant base that receives.
Adopt the present invention, compared with prior art, have that group prosecutor formula is flexible, line is simple, extensibility is strong and the base station between the effective advantage of Signal Spacing.Compare the mode of reinstating hardware setting principal and subordinate base station, it is dominant base that the present invention can set a certain single base station arbitrarily at network side, in case dominant base breaks down, also can reassign new dominant base easily; Simultaneously, any one organized control from when break down in the base station, all can not influence other by do not organized the control base station normal operation, good fault freedom is promptly arranged.The present invention also uses the method for " line with " to make external synchronous number of cables descend greatly, and this advantage because the holding wire of input and output reduces, has also been simplified the complexity of logic determines especially obvious when big by single base station number of group control.The reduction that hardware connects complexity makes of the present invention group of control base station of employing have favorable expansibility, and the employing of optocoupler makes the isolation of the signal that transmit the base station be guaranteed.The bearing calibration of adopting dominant base to send the frame clock signal of receiving slot produces when avoiding between master and slave base station the transmission frame clock signal and postpones.
Description of drawings
Fig. 1 is the connection diagram of many group of base stations control under the conventional hardware synchronization group prosecutor formula;
Fig. 2 is the schematic diagram of PHS set of systems control base station transmits frame sequential;
Fig. 3 is three group of base stations controls of one embodiment of the present of invention system connection diagram;
Fig. 4 is that the detailed structure of synchronous optocoupler in one embodiment of the present of invention reaches and the bus connection diagram;
Fig. 5 is the method flow diagram that the present invention realizes the group of base stations control.
Embodiment
Consider because the hardware line, between master and slave base station, can produce delay during the transmission frame clock signal, therefore when using technical scheme of the present invention, need proofread and correct the frame clock signal that is transmitted.
Referring to Fig. 2, Figure 2 shows that the frame sequential schematic diagram of PHS set of systems control base station transmits.The 21st, the frame format of the PHS of STD-28 agreement regulation, the length of every frame is 5ms, is made up of 8 time slots: 211 be 4 sending time slots (T1～T4), 212 is 4 receiving slots (R1～R4), after putting into effect, the base station at first sends signal (sending time slots), then received signal (receiving slot).The 22nd, the frame clock signal of the sending time slots that is produced by above-mentioned frame format 21 after dominant base puts into effect, 221 indicate the initial of transmission signal one frame.The 23rd, the frame clock signal of the sending time slots that sends by dominant base that receives from the base station, 231 is that frame clock signal 221 in 22 arrives from signal of base station after cable transmission delay 232.Because what at first produce after the base station puts into effect is the frame signal of sending time slots, therefore the delay that will process on this signal to eliminate the frame clock signal that receives from the base station is difficult.The bearing calibration that the present invention proposes is: dominant base sends the frame clock signal of receiving slot.In Fig. 2,24 is that dominant base is illustrated to the frame clock signal that sends from the base station in the inventive method, wherein 241 for through adjusting after to frame clock signal from the receiving slot of base station transmission, as can be seen, this signal is equipped with an advance offset amount 242 with respect to the start bit of receiving slot, and this lead is the delay (this can record easily) that transmission causes; 25 is the frame clock signal signal that receives from the base station in the inventive method, wherein 251 is the frame clock signals through the receiving slot after transmission and the processing that receive from the base station, as can be seen, just in time the original position with receiving slot was consistent when the frame clock signal of the receiving slot that dominant base sends after adjusting arrived from the base station, 251 used frame sequential when working from the base station in the group control base station the most at last.Need to prove that because transmission is the frame sequential of receiving slot, and therefore the first clock signal of this signal after not to be the base station put into effect be easy to adjust it and send position (putting the advance offset amount), proofreaies and correct the receive delay from the base station.
The connection diagram of 3 single base stations 31,32,33 of Fig. 3 " line with " of the present invention for using mode group control.With single base station 31 is example, and its structure is as follows: master cpu 311 will be responsible for obtaining whether dominant base of this base station from network side, and with master and slave base station sign notice TDMA/TDD processing unit 312; The TDMA/TDD processing unit 312 responsible frame sequential that produce this base station work, if dominant base, then TDMA/TDD processing unit 312 sends the extremely synchronous optocoupler 313 of the frame sequential that is produced by interface 315; If from the base station, then TDMA/TDD processing unit 312 is by the frame sequential of interface 316 receptions from synchronous optocoupler 313; Optocoupler 313 links to each other with line interface unit 314 synchronously, be responsible for sending or the received frame sequential, by its " line with " function, make inner reversible line when delivering to line interface unit 316, become " bus " but of transmitted in both directions signal, external line when making the control of many group of base stations significantly reduces, and only uses a pair of (comprising ground link); Line interface unit 316 is line interfaces that external base station connects, and 34 is the cable that base station 31 is connected to base station 32, and 35 is the cable that base station 32 is connected to base station 33, and the frame clock signal of dominant base promptly is transferred to from the base station by cable 34 and 35.Cable 36 and 37 is 31,32,33 of a base stations line altogether.
Four group of base stations controls if desired then only need will transmit the cable 38 of frame clock signal and get final product for the corresponding cable interface that the cable 39 that connects and the 4th stylobate station are provided between the base station links to each other commonly.
Organize control for N stylobate station, also only need get final product with the cable of the transmission frame clock signal at (N-1) stylobate station and for the corresponding cable interface that the cable that connects and N stylobate station are provided between the base station links to each other commonly.
Referring to Fig. 4, just synchronously " line with " function of being provided of optocoupler is described in further detail.313,323,333 correspond respectively to the synchronous optocoupler part in the base station 31,32,33 among Fig. 3 shown in the figure, are its inside detailed structure view.Wherein, optocoupler 313 comprises that one receives synchronous optocoupler 41 and the synchronous optocoupler 42 of transmission synchronously; Optocoupler 323 comprises that one receives synchronous optocoupler 43 and the synchronous optocoupler 44 of transmission synchronously; Optocoupler 333 comprises that one receives synchronous optocoupler 45 and the synchronous optocoupler 46 of transmission synchronously.
Be that example describes its operation principle in detail with synchronous optocoupler 313 below:
If this base station is from the base station, then TDMA/TDD processing unit 312 can be put high level at the frame sequential transmitting terminal 413 that sends synchronous optocoupler 41, and this moment, device 412 was in the state of disconnection because device 411 ends, therefore be high level on the output line 414, no signal is outwards exported.
If this base station is a dominant base, then TDMA/TDD processing unit 312 can be delivered to the frame sequential 241 as shown in Figure 2 that dominant base produces on the frame sequential transmitting terminal 413 that sends synchronous optocoupler 41.When this clock signal 241 is in low level, device 411 conductings, device 412 conductings, thereby 415 ends that the level of output 414 is grounded are pulled to low level.This low level signal is transported on the port 423 that receives synchronous optocoupler 42, device 421 conductings, and device 422 conductings, so the port 425 that is grounded of the level of frame sequential receiving terminal 424 draws and is low level, as the signal level that will transmit.When clock signal 241 is in high level, device 411 ends, device 412 disconnects, be high level on the output 414, be transferred on the port 423 that receives synchronous optocoupler 42 that this high level causes device 421 to end, device 422 disconnects, level on this time frame sequential receiving terminal 424 is high level, as the signal level that will transmit by moving power supply on the resistance to.So far finished a frame time sequential pulse signal 241 and sent synchronous optocoupler 41 to the transmission that receives between the synchronous optocoupler 42.As receiving the course of work of synchronous optocoupler 42, the frame sequential of dominant base is transferred to equally on the synchronous optocoupler 44 of the reception of base station and 46.Finish the signal transmission that the group of base stations control needs.Cable 34 and 35 is corresponding to the group control line between the single base station among Fig. 3 31,32,33 among the figure.
The present invention realizes that the method step of group of base stations control is as follows:
First step network side is provided with a dominant base (can establish any one single base station is dominant base);
The second step dominant base sends the frame clock signal of receiving slot, and this step can comprise the following steps: again
1 judges it self is dominant base,
2 put into effect by normal flow,
3 proofread and correct the frame clock signal of receiving slot,
3 send the frame clock signal of this base station receiving slot;
Second step, this step can comprise the following steps: again from base station and dominant base frame synchronization
1 judges from as from the base station,
2 put high level at frame sequential transmitting terminal,
3 wait for that dominant base puts into effect,
4 receive the frame clock signal of the receiving slot of dominant base transmission,
5 finish frame synchronization (frame head aligns) by the frame clock signal of the dominant base that receives with dominant base;
The 3rd step was finished the group control, and normal operation is dropped in group control base station.
Be elaborated according to flow process shown in Figure 5 below:
This flow process is initial by step 501, sets a dominant base by software at network side, can be dominant base by any one single base station that the cable set control connects by software set in the method for the invention, and all the other are from the base station; Following step 502 is finished in TDMA/TDD processing unit (as 312), and whether this base station of this unit judges is dominant base; If dominant base then enters step 503, in the step 504, the base station puts into effect the stage according to normal flow process, produces and adjust the frame clock signal (241) of receiving slot; In the following step 505, dominant base is about to transmit frame clock signal (241) this clock signal and delivers to the frame sequential transmitting terminal (as 413) that sends synchronous optocoupler (as 41).If this base station of judged result of step 502 is from the base station, then enter step 506, dispose high level at the frame sequential transmitting terminal (as 413) that sends synchronous optocoupler (as 41) from the base station; Following step 507 judges whether dominant base puts into effect, does not then continue from the base station to wait for that dominant base puts into effect if put into effect; Then the processing from the base station enters step 508 after dominant base puts into effect, promptly receives the frame clock signal (241) of dominant base at the frame sequential receiving terminal (as 424) that receives synchronous optocoupler (as 42) from the base station; Step 509 is to adjust own frame sequential from the base station, and the frame sequential that sends over dominant base makes the frame head of oneself align with dominant base as the reference of the frame clock signal of the work of adjustment oneself; Comprise in the step 510 from whole group of control base station of base station all putting into effect that whole group of control process of last step 511 finishes.
Claims (5)
1, a kind of group of base stations control system, comprise N base station, each base station comprise master cpu, the TDMA/TDD processing unit that is connected with described master cpu, the Synchronous Processing timing unit that is connected with described TDMA/TDD processing unit, with the line interface unit that described Synchronous Processing timing unit is connected, it is characterized in that:
The synchronous sequence processing unit is the synchronous optocoupler that line and function can be provided;
Described master cpu is responsible for the sign of master and slave base station is issued; Described TDMA/TDD processing unit is used to produce the frame sequential, and the frame clock signal of the frame clock signal being sent into described synchronous optocoupler or obtaining from described synchronous optocoupler to receive; A frame timing bus of being drawn by described line interface unit between each base station is connected with a ground wire and transmits the frame clock signal.
2, the described group of base stations control of claim 1 system is characterized in that: described synchronous optocoupler comprises that one receives synchronous optocoupler and the synchronous optocoupler of transmission, and the input of the synchronous optocoupler of described reception is connected with the output of the synchronous optocoupler of described transmission.
3, in claim 1 or 2 described systems, realize the method for group of base stations control, comprising:
It is dominant base that the first step is provided with arbitrary base station at network side;
The second step dominant base sends the frame clock signal of receiving slot;
The 3rd step is from base station and dominant base frame synchronization;
The 4th step was finished the group control, and normal operation is dropped in group control base station.
4, the method for the described realization group of base stations of claim 3 control is characterized in that, described second step comprises:
1) judges it self is dominant base;
2) put into effect by normal flow;
3) the frame clock signal of correction receiving slot;
4) send the frame clock signal of this base station receiving slot.
5, the method for the described realization group of base stations of claim 3 control is characterized in that, described the 3rd step comprises:
1) judges from as from the base station;
2) put high level at frame sequential transmitting terminal;
3) wait for that dominant base puts into effect;
4) the frame clock signal of the receiving slot of reception dominant base transmission;
5) finish frame synchronization by the frame clock signal and the dominant base of the dominant base that receives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03139993 CN1290347C (en) | 2003-07-28 | 2003-07-28 | Base station group control system and realizing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03139993 CN1290347C (en) | 2003-07-28 | 2003-07-28 | Base station group control system and realizing method thereof |
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| Publication Number | Publication Date |
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| CN1578483A true CN1578483A (en) | 2005-02-09 |
| CN1290347C CN1290347C (en) | 2006-12-13 |
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| CN 03139993 Expired - Fee Related CN1290347C (en) | 2003-07-28 | 2003-07-28 | Base station group control system and realizing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101361324B (en) * | 2005-12-23 | 2012-04-18 | Nxp股份有限公司 | Flow control mechanisms on synchronous serial tdma bus |
| CN110262343A (en) * | 2019-06-21 | 2019-09-20 | 新里程医用加速器(无锡)有限公司 | Real-time communication network for clinac control system |
-
2003
- 2003-07-28 CN CN 03139993 patent/CN1290347C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101361324B (en) * | 2005-12-23 | 2012-04-18 | Nxp股份有限公司 | Flow control mechanisms on synchronous serial tdma bus |
| CN110262343A (en) * | 2019-06-21 | 2019-09-20 | 新里程医用加速器(无锡)有限公司 | Real-time communication network for clinac control system |
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| Publication number | Publication date |
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| CN1290347C (en) | 2006-12-13 |
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Granted publication date: 20061213 Termination date: 20130728 |