CN100399731C - Method for obtaining converting point position information by TDSCDMA repeater - Google Patents
Method for obtaining converting point position information by TDSCDMA repeater Download PDFInfo
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- CN100399731C CN100399731C CNB2005100188308A CN200510018830A CN100399731C CN 100399731 C CN100399731 C CN 100399731C CN B2005100188308 A CNB2005100188308 A CN B2005100188308A CN 200510018830 A CN200510018830 A CN 200510018830A CN 100399731 C CN100399731 C CN 100399731C
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Abstract
The present invention relates to a method for obtaining converting point position information by a time dividing synchronous CMDA direct-play station based on the detection of signal intensity, which comprises the following steps: a. the direct-play station detects the intensity of received downstream signals, detecting results are matched with the characteristics of a frame structure of a TD-SCDMA, and the position information of a first converting point of a sub frame is obtained; b. the correctness of the position information of the first converting point is verified, if the position information of the first converting point is correct, the direct-play station is converted to a step c, and if the position information of the first converting point is not correct, the direct-play station is converted to the step a; c. the direct-play station obtains the position information of a second converting point by the method of hypothesis verification. The present invention has the characteristics of high reliability and capability of simply and easily obtaining the position information of the two converting points of the TD-SCDMA system.
Description
Technical field
The present invention relates to the method that a kind of TD SDMA TD-SCDMA repeater obtains position of conversion point information.
Background technology
TD-SCDMA is one of 3G (Third Generation) Moblie air interface technologies standard of the formal issue of the ITU of International Telecommunications Union, and its key technology has time division duplex technology, intelligent antenna technology, the associated detection technique that can adjust the up-downgoing switching point.The advantage outstanding behaviours of TD-SCDMA has obtained good equilibrium, there have been good sustained development and technology evolution in efficient support, the system self of mixed service between the anti-interference and power system capacity in system.
The multiple access access scheme of TD-SCDMA belongs to DS-SCDMA, and spreading rate is 1.28Mc/s, and apread spectrum bandwidth is about 1.6MHz, adopts the TDD working method that does not need pair frequency.Its descending and up information is to transmit on the different time-gap of same carrier frequency.The physical channel of TD-SCDMA adopts four-layer structure: system-frame, radio frames, subframe and time slot/sign indicating number.Fig. 1 is the physical channel signal form of TD-SCDMA.Its frame structure is divided into the subframe of two 5ms with the radio frames of 10ms, and 7 conventional time slots and 3 special time slots are arranged in each subframe.Three special time slots are respectively descending pilot frequency time slot DwPTS, main protection time slot GP and uplink pilot time slot UpPTS.TS in 7 conventional time slots
0Always distribute to down link, and TS
1Always distribute to up link.By the number of flexible configuration uplink and downlink timeslot, make TD-SCDMA be applicable to up-downgoing symmetry and non-symmetrical service pattern.Separate by transfer point between ascending time slot and the descending time slot.In the TD-SCDMA system, the subframe of each 5ms has two transfer points: first transfer point is to forward up link to from down link, the GP of position between DwPTS and UpPTS; Second transfer point is to forward down link to from up link, the position in each subframe between last ascending time slot and second descending time slot, TS
0It is first descending time slot.Wherein, first transfer point was fixed with respect to the time started of each subframe; Second transfer point changes along with the timeslot number difference of distributing to up-downgoing.
The overlay area of which kind of radio communication all will produce weak signal area and blind area, and to some remote districts and the few blind area of number of users, it is too high to set up the base station cost, infrastructure is also complicated, provide for this reason a kind of cost low, set up simply, have but that small base station function, cost-effective equipment---repeater is necessary.Therefore, important role is being played the part of in the TD-SCDMA repeater in the TD-SCDMA network.
In the TD-SCDMA system, uplink signal and down link signal are in same frequency, distinguish uplink and downlink by time-multiplexed mode.Therefore the TD-SCDMA repeater need obtain two position of conversion point information, finishes the up-downgoing of radio-frequency channel is switched.
The existing method of obtaining first position of conversion point information has: feature window search method and descending synchronous code correlation method.The basis of feature window search method is: the protection interval of 48 chips is arranged before the SYNC-DL, the protection interval of 96 chips is arranged behind the SYNC-DL, and the power of SYNC-DL signal is very big.Existing feature window search method only removes to search SYNC-DL according to certain matching criterior.But existing feature window search method is subjected to the interference of user terminal or adjacent base station erroneous judgement to occur easily.The descending synchronous code correlation method is not allowed to be subject to disturb, but its technical sophistication degree height is not easy to realize concerning the producer of repeater.
Someone proposes to realize obtaining of second transfer point by the positional information of second transfer point of broadcasting in the TD-SCDMA system broadcast channel.There are following two problems in this method: 1, the existing TD-SCDMA system protocol of change; 2, technical sophistication degree height.
Summary of the invention
Purpose of the present invention is in order to overcome defective or the problem that above-mentioned prior art exists, and a kind of high reliability, simple the method for obtaining two position of conversion point information of TD-SCDMA system are provided.
This method comprises the steps:
A. intensity detection is carried out to the downstream signal that receives in the repeater, and the frame characteristics of testing result and TD-SCDMA is mated, and obtains first position of conversion point information of subframe;
B. verify the correctness of first position of conversion point information, if first position of conversion point information is correct, the repeater forwards step c to; Otherwise the repeater forwards step a to;
C. the repeater adopts the method for hypothesis verification to obtain second position of conversion point information.
By analyzing the TD-SCDMA frame structure, find that it has obvious characteristics: TS
0Always distribute to down link with DwPTS, and time and other time slot that the emission of DwPTS time slot is continued are all inequality.Therefore detected down receiving signal intensity results and TD-SCDMA frame characteristics are mated, can obtain first position of conversion point information of subframe.
Set up the false synchronous probability in the process synchronously and improve first transfer point foundation synchronously antijamming capability later in order to reduce first transfer point, the present invention will adopt the synchronous protection algorithm.The synchronous protection algorithm is: synchronous process is divided into two states--catch attitude and keep attitude; Setting up in the process synchronously, when having only continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics coupling, the repeater just forwards to from the seizure attitude and keeps attitude; After setting up synchronously, when having only continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics not to match, the repeater just forwards the seizure attitude to from keeping attitude.
After first transfer point of subframe was set up synchronously, the repeater adopted the hypothesis verification method to obtain second transfer point.The hypothesis verification method is as follows:
At time slot TS
iDuring this time, if time slot TS is preferentially supposed in the repeater
iBe ascending time slot, then carry out following operation and judgement:
1. open up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
2. if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, do not change book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter step 3;
3. open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
4. if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, with book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferentially be assumed to be descending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferential hypothesis state.
At time slot TS
iDuring this time, if time slot TS is preferentially supposed in the repeater
iBe descending time slot, then carry out following operation and judgement:
I. open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
II. if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter Step II I;
III. open up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
IV. if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, with time slot TS in next subframe
iPreferentially be assumed to be ascending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state.
Obtain second transfer point of TD-SCDMA system by hypothesis verification constantly.
Description of drawings
Fig. 1 is the physical channel signal form of TD-SCDMA.
Fig. 2 is the structure of time slot of DwPTS.
Fig. 3 is the structure of time slot of UpPTS.
Fig. 4 is a TD-SCDMA system convention time slot burst structure.
Fig. 5 is a downstream signal intensity detector output characteristic waveform.
Fig. 6 obtains the flow chart of position of conversion point information for repeater of the present invention.
Embodiment
In order to make the solution of the present invention clearer, the present invention is described in more detail below in conjunction with example.
Fig. 1 is the physical channel signal form of TD-SCDMA.The physical channel of TD-SCDMA adopts four-layer structure: system-frame, radio frames, subframe and time slot/sign indicating number, its frame structure is divided into the subframe of two 5ms with the radio frames of 10ms, and 7 conventional time slots and 3 special time slots are arranged in each subframe.Three special time slots are respectively descending pilot frequency time slot DwPTS, main protection time slot GP and uplink pilot time slot UpPTS.TS in 7 conventional time slots
0Always distribute to down link, and TS
1Always distribute to up link.By the number of flexible configuration uplink and downlink timeslot, make TD-SCDMA be applicable to up-downgoing symmetry and non-symmetrical service pattern.Separate by transfer point between ascending time slot and the descending time slot.In the TD-SCDMA system, the subframe of each 5ms has two transfer points: first transfer point is to forward up link to from down link, the GP of position between DwPTS and UpPTS; Second transfer point is to forward down link to from up link, the position in each subframe between last ascending time slot and second descending time slot, TS
0It is first descending time slot.Wherein, first transfer point was fixed with respect to the time started of each subframe; Second transfer point changes along with the timeslot number difference of distributing to up-downgoing.
Fig. 2 is the structure of time slot of DwPTS.DwPTS is descending pilot frequency and Synchronization Design, its by length be 32 chips protection at interval and length be that the downlink synchronous sequence SYNC-DL of 64 chips forms.
Fig. 3 is the structure of time slot of UpPTs.UpPTS is for setting up uplink synchronous design.
Fig. 4 is a TD-SCDMA system convention time slot burst structure, its by two long be the data block, of 352 chips long be the intermediate code of 144 chips and one long be that the protection of 16 chips is formed at interval.
By analyzing the TD-SCDMA frame structure, find to have obvious characteristics: TS
0Always distribute to down link with DwPTS, and time and other time slot that the emission of DwPTS time slot is continued are all inequality.When descending signal strength detector meets the following conditions: if received signal intensity detector output high level during greater than decision threshold, otherwise output low level, then the downstream signal intensity detector will be the cycle with 5ms, periodically export signature waveform shown in Figure 5.Therefore, intensity detection can be carried out by the downstream signal to reception in the repeater, and the frame characteristics of testing result and TD-SCDMA is mated, and obtains first transfer point of subframe.In order to simplify the complexity of repeater, in the actual characteristic matching process, the repeater can be only with the output of downstream signal intensity detector and DwPTS the wide high impulse of corresponding 64 chips mate.
The flow process that the TD-SCDMA repeater obtains position of conversion point information is as follows:
Intensity detection is carried out to the downstream signal that receives in step a repeater, and the frame characteristics of testing result and TD-SCDMA is mated.If when continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics coupling, the repeater then changes first transfer point over to and keeps attitude synchronously, and obtains first position of conversion point information, forwards step b then to; Otherwise step a operation is still carried out in the repeater.
Step b verifies the correctness of first transfer point.If the positional information of first transfer point is correct, the repeater forwards step c to; Otherwise the repeater forwards step a to.
The correctness determination methods of first transfer point is as follows:
If the repeater is in first transfer point and keeps attitude synchronously, when continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics do not match, think that then first position of conversion point information is incorrect, and forward first transfer point to and catch attitude synchronously; Otherwise think that first position of conversion point information is correct, first transfer point maintains synchronously keeps attitude.
Step c adopts the method for hypothesis verification to obtain second position of conversion point information.
The hypothesis verification method is as follows:
At time slot TS
iDuring this time, if time slot TS is preferentially supposed in the repeater
iBe ascending time slot, then carry out following operation and judgement:
1. open up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
2. if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, do not change book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter step 3;
3. open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
4. if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, with book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferentially be assumed to be descending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change book frame slot TS
I+1To time slot TS
6And time slot TS in next subframe
iTo time slot TS
6Preferential hypothesis state.
At time slot TS
iDuring this time, if time slot TS is preferentially supposed in the repeater
iBe descending time slot, then carry out following operation and judgement:
I. open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
II. if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter Step II I;
III. open up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
IV. if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, with time slot TS in next subframe
iPreferentially be assumed to be ascending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state.
By continuous repeating step c, the repeater obtains second position of conversion point information of TD-SCDMA system.
Claims (1)
1. one kind is obtained the method for two transfer points based on repeater in the TDS-CDMA system of signal strength detection, it is characterized in that this method comprises the steps:
Intensity detection is carried out to the downstream signal that receives in a, repeater, when continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics coupling, the repeater then changes first transfer point over to and keeps attitude synchronously, and obtains first position of conversion point information;
B, verify the correctness of first position of conversion point information: if the repeater is in first transfer point and keeps attitude synchronously, when continuous several times down receiving signal intensity detection result and TD-SCDMA frame characteristics do not match, think that then first position of conversion point information is incorrect, and forward first transfer point to and catch attitude synchronously, the repeater forwards step a to; Otherwise think that first position of conversion point information is correct, first transfer point maintains synchronously keeps attitude, and the repeater forwards step c to;
C, repeater adopt the method for hypothesis verification to obtain second position of conversion point information, and the method for described hypothesis verification is as follows:
At time slot TS
1During this time, if time slot TS is preferentially supposed in the repeater
1Be ascending time slot, then carry out following operation and judgement:
(1) opens up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
(2) if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, do not change book frame slot TS
I-1To time slot TS
bAnd time slot TS in next subframe
iTo time slot TS
bPreferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter step (3);
(3) open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
(4) if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, with book frame slot TS
I-1To time slot TS
bAnd time slot TS in next subframe
iTo time slot TS
bPreferentially be assumed to be descending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change book frame slot TS
I-1To time slot TS
bAnd time slot TS in next subframe
1To time slot TS
bPreferential hypothesis state;
At time slot TS
iDuring this time, if time slot TS is preferentially supposed in the repeater
iBe descending time slot, then carry out following operation and judgement:
(I) open the downlink radio frequency link, close up radio frequency link, and the downstream signal that receives is carried out intensity detection;
(II) if the downstream signal intensity that detects reception greater than decision threshold, thinks that then this time slot is a descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state finishes the control and the judgement of this time slot; Otherwise, enter step (III);
(III) open up radio frequency link, close the downlink radio frequency link, and the upward signal that receives is carried out intensity detection;
(IV) if the uplink signal strength that detects reception greater than decision threshold, thinks that then this time slot is an ascending time slot, with time slot TS in next subframe
iPreferentially be assumed to be ascending time slot; Otherwise, can not determine that then this time slot is up or descending time slot, do not change time slot TS in next subframe
iPreferential hypothesis state.
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| CN1988413B (en) * | 2005-12-19 | 2010-11-17 | 大唐移动通信设备有限公司 | Synchronous method and device for time division duplex communication system |
| CN1897478B (en) * | 2006-06-23 | 2011-12-07 | 京信通信技术(广州)有限公司 | Wave-detecting synchronizer of time-division synchronizing CDMA digital high-frequency amplification station |
| CN1897747B (en) * | 2006-06-23 | 2010-05-12 | 京信通信技术(广州)有限公司 | Uplink and downlink self-adaptive switching method of time-division synchronous CDMA digital optical fiber direct station |
| CN101207853B (en) * | 2006-12-19 | 2010-05-12 | 武汉虹信通信技术有限责任公司 | TD-SCDMA straight amplification station with intelligent synthesis network supervising function |
| CN101022300B (en) * | 2007-03-23 | 2011-11-30 | 摩比天线技术（深圳）有限公司 | Method for TD-SCDMA trunk amplifier obtaining switching point position |
| CN101123463B (en) * | 2007-08-10 | 2011-01-26 | 福建邮科通信技术有限公司 | Implementation method for remote distance relay of TD-SCDMA repeater |
| CN101207429B (en) * | 2007-12-14 | 2011-02-16 | 北京北方烽火科技有限公司 | Apparatus and method for obtaining switch point in TDD WiMAX straight amplification station |
| CN101217720B (en) * | 2008-01-16 | 2013-02-06 | 福建先创电子有限公司 | An acquisition method of transition point of repeater in TD-SCDMA network overlay system |
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| US20040190541A1 (en) * | 2003-03-26 | 2004-09-30 | Interdigital Technology Corporation | Determination of optimal switching points between the uplink and downlink |
| CN1582001A (en) * | 2003-07-31 | 2005-02-16 | 华为技术有限公司 | Method for high-frequency amplifying station to gain switching point in TD-SCDMA system |
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| US20040190541A1 (en) * | 2003-03-26 | 2004-09-30 | Interdigital Technology Corporation | Determination of optimal switching points between the uplink and downlink |
| CN1582001A (en) * | 2003-07-31 | 2005-02-16 | 华为技术有限公司 | Method for high-frequency amplifying station to gain switching point in TD-SCDMA system |
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Assignee: Shenzhen Hongyuan Communication Limited Liability Company Assignor: Wuhan Hongxin Communication Technology Co., ltd. Contract fulfillment period: 2009.3.16 to 2019.3.16 Contract record no.: 2009440000232 Denomination of invention: Method for obtaining converting point position information by TDSCDMA repeater Granted publication date: 20080702 License type: Exclusive license Record date: 20090407 |
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Address after: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee after: CITIC Mobile Communication Technology Co.,Ltd. Address before: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee before: CITIC Mobile Communication Technology Co., Ltd |