CN101159472B - Method and repeater system for TD-SCDMA accurate time slot power measurement - Google Patents
Method and repeater system for TD-SCDMA accurate time slot power measurement Download PDFInfo
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- CN101159472B CN101159472B CN200710177519A CN200710177519A CN101159472B CN 101159472 B CN101159472 B CN 101159472B CN 200710177519 A CN200710177519 A CN 200710177519A CN 200710177519 A CN200710177519 A CN 200710177519A CN 101159472 B CN101159472 B CN 101159472B
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Abstract
The invention relates to a method and a repeater system of TD-SCDMA precise time-slot power measurement. The repeater system comprises a GPS module, a distance-testing module and a power detecting module; the GPS module is externally connected with a repeater station and provides pulsed signal, determining the position of the repeater station and a donor base station; the distance-testing module is put in the repeater station, receiving the pulsed signal and calculating the distance between the rising edge of the 1PPS pulse of the GPS module and the nearest 5 ms synchronous position; the power detecting module is also put in the repeater, receiving a precise time-slot pulsed signal and measuring power based on the output time-slot position. The system and the method in the invention can automatically measure the distance between the TD-SCDMA repeater system and the donor base station, generate the precise signal-controlling power detection and thereby precisely measure the uplink-downlink time-slot power of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method and repeater system of the TD-SCDMA of being used for accurate time slot power measurement.
Background technology
TD-SCDMA (synchronous code division multiple access of time-division one) technology is 3G (3G (Third Generation) Moblie technology) technical standard that China proposes voluntarily, and the many advantage technologies that wherein adopt make it occupy certain share in 3G market.TD-SCDMA technology has adopted TDD (time division duplex) technology mode that need not pair frequency; The intrinsic characteristics of TDD technology mode itself are: do not need the continuous symmetrical frequency band of big section; The uplink and downlink communication work has improved the utilance of communications band resource greatly in same frequency range.
Repeater in the TD-SCDMA system is different from other communication system repeater, and the main distinction is synchronous TDD mode.The prerequisite of TD repeater operate as normal is to obtain synchronously with donor base station.As known in the art, TD-SCDMA is a kind of tdd systems, and each subframe comprises 7 conventional time slots, 3 special time slots and two time slot transfer points.For making the uplink and downlink signal smoothly intactly through the repeater, the TD-SCDMA system repeater must keep synchronized relation with the base station, to receive and dispatch conversion accurately.If TD-SCDMA system repeater and base station step-out will make the UE (subscriber equipment) can not the right demodulation signal of communication, occur staggered time slot between the base station, even cause whole communication network paralysis.
In the TD-SCDMA communication system network was built, according to the test specification of parent company of group of China Mobile to GSM repeater function, power measurement need be carried out to each the conventional time slot in the TD-SCDMA communication system physical frame in the repeater.In current measuring methods; After repeater and TD-SCDMA communication system donor base station are synchronous, just confirmed the starting position of 5ms physical frame, because each physics frame length is fixed in the TD-SCDMA communication system; Each slot length in every frame is also fixing; Therefore pass through the starting position of 5ms physical frame, and, then each time slot is carried out power measurement according to the position that the length of each time slot is calculated each time slot.Though this method of measurement can accurately be calculated the position of communication descending time slot, but there is certain error in the position measurement of ascending time slot.
There is certain distance between the donor base station of TD-SCDMA communication system and the repeater, on radio frames transmits, no doubt has propagation delay time.After repeater and donor base station completion 5ms frame synchronization, then think always synchronous for descending time slot, but, need time delay be compensated and to carry out accurately synchronously for ascending time slot.
Therefore,, each time slot in the repeater just need accurate method of measurement to calculate the particular location of each time slot when being carried out power measurement, so that accurately measure the power of each time slot.
Summary of the invention
Based on the defective that above-mentioned prior art exists, the object of the invention is: a kind of repeater system of the TD-SCDMA of being used for accurate time slot power measurement is provided, and can realizes the method for above-mentioned accurate time slot power measurement simply, effectively.
The repeater system of a kind of TD-SCDMA of being used for accurate time slot power measurement of the present invention comprises a GPS (global positioning system) module, and a repeater, and this repeater also comprises a range finder module and a power detection module.External and the range finder module of GPS module wherein, and the pulse signal of a 1PPS is provided, be used for confirming repeater and donor base station position; Range finder module in the repeater receives above-mentioned 1PPS pulse signal and calculates the 1PPS rising edge of a pulse of GPS module and the distance between the hithermost 5ms sync bit; Power detection module in the repeater receives the accurate time slot pulse signal from range finder module, and measures to the time slot position power of output.
The present invention also provides a kind of method of the TD-SCDMA of being used for accurate time slot power measurement, and this method comprises:
Step 1, the 1PPS pulse signal input repeater that the GPS module is sent;
Step 2, make repeater and donor base station synchronous, confirm the 5ms starting position;
Distance between the 1PPS pulse signal rising edge of the range finder module record GPS module in step 3, the repeater and the nearest 5ms starting position;
Step 5, power detection module are done accurate power measurement to the time slot position of output.
Description of drawings
Fig. 1 is a TD-SCDMA communication system physical frame structure;
Fig. 2 is the TD-SCDMA of being used for an accurate time slot power measurement schematic diagram according to the invention;
Fig. 3 is the method flow diagram of the TD-SCDMA of being used for accurate time slot power measurement according to the invention;
Fig. 4 is the repeater system structure chart of the TD-SCDMA of being used for accurate time slot power measurement according to the invention.
Embodiment
In order to make scheme of the present invention clear more detailed, the specific embodiment of the invention is done further detailed description below in conjunction with accompanying drawing.
Fig. 1 is the physical frame structure of TD-SCDMA communication system.Each physical frame as shown in the figure comprises 7 conventional time slots and pilot time slot.The present invention needs the accurately starting position of 7 the conventional time slots in location.
Fig. 2 is the schematic diagram corresponding to accurate time slot power measurement according to the invention.Shown in Fig. 2 (among the figure for DwPTS (Downlink Pilot Time Slot) and UpPTS (Uplink Pilot Time Slot) do not draw corresponding guard interval); Wherein T1 be between repeater and the donor base station apart from time delay value, T2 be between UE and the donor base station apart from time delay value.Interjacent position, repeater, the accurate power location that needs to measure has all showed with shades of colour.Can know that from figure the main protection interval of DwPTS back has been compressed 2*T1, there is the clear area (promptly being stretched) of 2*T1 in second transfer point.This effect for the repeater up-downgoing switch to be any influence of nobody (as long as first position of conversion point is put properly; Such as just opening up receiving key in several chips of leading down after the end); If but do not consider T1; The 5ms synchronizing signal of coming out according to synchronization module separately comes driving power to measure, and obviously the ascending time slot power measurement is inaccurate.Can know from top figure; If being benchmark, the 5ms synchronizing signal of coming out according to synchronization module separately drives time slot power measurement; The power of descending time slot can be surveyed standard basically, because the stretching that 2*T1 length is a little changed at the time slot compression of the 2*T1 length in main protection interval and second station is just offset; But there is error (the actual power that comprises the back long 2*T1 length of time slot of the measured value of this time slot) in the power measurement of ascending time slot, and repeater and donor base station distance is far away more, and error is big more.Way is to consider the influence of T1 accurately, promptly removes the compression of the interval 2T1 of main protection, considers the stretching of second transfer point simultaneously.The time-gap pulsing of the TSi (i=0,1,2,3,4,5,6) that the red part of the lower part among Fig. 2 has been represented to obtain.The length of each time slot is all fixed in the frame structure of TD-SCDMA, just can measure the power of each time slot as long as known the starting position of each time slot.
Fig. 3 be the present invention according to above-mentioned principle, be used for TD-SCDMA accurate time slot power measurement flow chart.Wherein be external in the pulse signal of the GPS module of repeater to repeater input 1PPS.In the TD-SCDMA networking, all need use this module during each position of confirming the repeater.Range finder module has been accomplished the range measurement between repeater and the TD-SCDMA donor base station, and the pulse signal of the starting position of output identification time slot TSi (i=0,1,2,3,4,5,6), in the repeater, preserves the distance that calculates.Obtain position between repeater and the TD-SCDMA donor base station.The repeater with donor base station synchronously after, range finder module obtains the starting position of each conventional time slot according to the distance value of the starting position of 5ms and preservation, and accurate time slot position is exported to the power detection module.The power detection module measures the performance number of a time slot according to the input of time slot position of exporting and input.
The distance with donor base station has been preserved in the repeater, under the situation that does not change the position, restarts, and just can calculate definite time slot position according to this value, measures thereby each time slot is carried out accurate power.
The concrete performing step of this method is following:
Step 1, measurement T1:
1, in the 1PPS pulse signal input repeater with GPS;
2, make range finder module and TD-SCDMA donor base station in the repeater synchronous, confirm the starting position of each 5ms TD-SCDMA physical frame;
3, range finder module is every at a distance from 1 second, writes down 1PPS rising edge of a pulse and near the distance between the 5ms starting position of this 1PPS, range accuracy is 1/10 chip;
4, record obtained 120 range data after 2 minutes, removed wherein to change king-sized value, and remaining value is carried out obtaining the T1 among Fig. 2 after the arithmetic average;
Step 2, preservation are also used T1;
1, the T1 that in step 1, calculates is saved in the TD-SCDMA repeater;
2, the TD-SCDMA repeater power on restart after, the T1 value that range finder module use to be preserved calculates the accurate starting position of each time slot, and output pulse signal is to the detection module;
3, the length of TSi (i=0,1,2,3,4,5,6) is fixed among the TD-SCDMA, is 675us, the power that the detection module can be measured time slot according to the pulse signal and the slot length of each time slot exact position;
Wherein, time slot power measurement pulse localization method is following:
1, through confirming the position of all downstream signals synchronously.Can calculate the position of descending pilot frequency synchronously, suppose that the initial position in the 5ms frame of descending pilot frequency is POSdl_sync (unit is 0.1chip, down together), second transfer point is at time slot 3.For descending, then the original position of TSO is [POSdl_sync-8960+64000] mod64000, and the original position of TSi (i=4,5,6) is at [POSdl_sync-320-(8-i) * 8640+64000] mod64000.
2,, can obtain the accurate position of upward signal according to T1.The accurate original position of ascending pilot frequency is [POSdl_sync+640+960-2*T1+64000] mod64000, and the accurate original position of TSi (i=1,2,3) is at [POSdl_sync+640+960-2*TA+1600+ (i-1) * 8640] mod64000.
Fig. 4 is the structure chart that the TD-SCDMA of being used for direct discharging station according to the invention carries out accurate time slot power measurement.As shown in the figure, comprise a GPS (global positioning system) module in the said structure, a range finder module and a power detection module.Wherein the GPS module is external in the repeater, and the range finder module in basis provides the pulse signal of a 1PPS, is used for confirming repeater and donor base station position; Range finder module in the repeater receives above-mentioned 1PPS pulse signal and calculates the 1PPS rising edge of a pulse of GPS module and the distance between the hithermost 5ms sync bit; Power detection module in the repeater receives the accurate time slot pulse signal from range finder module, and measures to the time slot position power of output.
The above is merely specific embodiment of the present invention, is not limited to the present invention, and to those skilled in the art, technical scheme of the present invention can have various changes or variation.All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc. and all should be included within the claim scope of the present invention.
Claims (3)
1. a repeater system that is used for the TD-SCDMA accurate time slot power measurement is characterized in that, said system comprises:
The GPS module, it is external in the repeater, and the pulse signal of an one-second burst (1PPS) is provided, and is used for confirming repeater and donor base station position;
Range finder module in the TD-SCDMA repeater, 1PPS rising edge of a pulse that is used to receive above-mentioned 1PPS pulse signal and calculate the GPS module and the distance between the hithermost 5msTD-SCDMA physical frame starting position;
The power detection module also in the TD-SCDMA repeater, is used to receive the accurate time slot pulse signal from range finder module, and measures to the time slot position power of output;
The method that range finder module obtains the accurate time slot pulse signal is specially:
Range finder module is every at a distance from 1 second; Write down 1PPS rising edge of a pulse and near the distance between the 5msTD-SCDMA physical frame starting position of this 1PPS; Range accuracy is 1/10 chip; Write down and obtain 120 range data after 2 minutes, removal wherein changes king-sized value, and remaining value is carried out obtaining T1 after the arithmetic average;
Through confirming synchronously the position of all downstream signals, calculate the position of descending pilot frequency after synchronously, suppose that the initial position in the 5ms frame of descending pilot frequency is POSdl_sync; Unit is 0.1 chip (chip), and second transfer point is at time slot 3, for descending; Then the original position of TS0 is [POSdl_sync-8960+64000] mod64000, and the original position of TSi is at [POSdl_sync-320-(8-i) * 8640+64000] mod64000, wherein i=4; 5,6;
According to T1, obtain the accurate position of upward signal, the accurate original position of ascending pilot frequency is [POSdl_sync+640+960-2*T1+64000] mod64000; The accurate original position of TSi is at [POSdl_sync+640+960-2*TA+1600+ (i-1) * 8640] mod64000; I=1 wherein, 2,3; Wherein TA is the acronym of Timing Advance, and implication is regularly in advance.
Wherein, TS is the acronym of Time Slot, and implication is a time slot; The implication of TS0 is a time slot 0; The implication of TSi is time slot i.
2. a method that is used for the TD-SCDMA accurate time slot power measurement is characterized in that, said method comprises:
Step 1, one-second burst (1PPS) the pulse signal input repeater that the GPS module is sent;
Step 2, make repeater and donor base station synchronous, confirm 5msTD-SCDMA physical frame starting position;
Distance between the 1PPS pulse signal rising edge of the range finder module record GPS module output in step 3, the repeater and the nearest 5msTD-SCDMA physical frame starting position;
Step 4, range finder module are kept at the calculated distance result in the repeater, and this distance just can be read in the repeater after restarting, and the range finder module in the repeater calculates the accurate position of TSi time slot, i=0 wherein, 1,2,3,4,5,6;
Step 5, power detection module are done accurate power measurement to the time slot position of output;
The method that range finder module obtains distance results is specially: range finder module is every at a distance from 1 second; Write down 1PPS rising edge of a pulse and near the distance between the 5msTI-SCDMA physical frame starting position of this 1PPS; Range accuracy is 1/10 chip; Write down and obtain 120 range data after 2 minutes, removal wherein changes king-sized value, and remaining value is carried out obtaining T1 after the arithmetic average;
The method that range finder module calculates the accurate position of TSi time slot is specially:
Through confirming synchronously the position of all downstream signals, calculate the position of descending pilot frequency after synchronously, suppose that the initial position in the 5ms frame of descending pilot frequency is POSdl_sync; Unit is 0.1 chip (chip), and second transfer point is at time slot 3, for descending; Then the original position of TS0 is [POSdl_sync-8960+64000] mod64000, and the original position of TSi is at [POSdl_sync-320-(8-i) * 8640+64000] mod64000, wherein i=4; 5,6;
According to T1, obtain the accurate position of upward signal, the accurate original position of ascending pilot frequency is [POSdl_sync+640+960-2*T1+64000] mod64000; The accurate original position of TSi is at [POSdl_sync+640+960-2*TA+1600+ (i-1) * 8640] mod64000; I=1 wherein, 2,3; Wherein TA is the acronym of Timing Advance, and implication is regularly in advance.
Wherein, TS is the acronym of Time Slot, and implication is a time slot; The implication of TS0 is a time slot 0; The implication of TSi is time slot i.
3. according to the said method of claim 2; It is characterized in that also comprising: T1 is saved in the repeater; And the TD-SCDMA repeater power on restart after, the T1 value that range finder module use to be preserved calculates the accurate starting position of each time slot, and output pulse signal is to the power detection module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2798502C1 (en) * | 2022-10-05 | 2023-06-23 | Акционерное Общество "Национальный институт радио и инфокоммуникационных технологий" (АО "НИРИТ") | Method for organizing cellular communications using a mobile repeater |
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| CN114051267B (en) * | 2021-11-22 | 2023-10-13 | 深圳市吉祥腾达科技有限公司 | Method for optimizing time division multiplexing based on network bridge spacing |
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| WO1999044315A1 (en) * | 1998-02-27 | 1999-09-02 | Siemens Aktiengesellschaft | Tdd telecommunications systems with wireless telecommunication based on code and time-division multiplex |
| CN1866789A (en) * | 2006-05-31 | 2006-11-22 | 福建邮科通信技术有限公司 | Method and apparatus for TD-SCDMA repeater GPS synchronization |
| CN1964209A (en) * | 2006-11-27 | 2007-05-16 | 武汉虹信通信技术有限责任公司 | A method to realize time division synchronous CDMA repeater power saving |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999044315A1 (en) * | 1998-02-27 | 1999-09-02 | Siemens Aktiengesellschaft | Tdd telecommunications systems with wireless telecommunication based on code and time-division multiplex |
| CN1866789A (en) * | 2006-05-31 | 2006-11-22 | 福建邮科通信技术有限公司 | Method and apparatus for TD-SCDMA repeater GPS synchronization |
| CN1964209A (en) * | 2006-11-27 | 2007-05-16 | 武汉虹信通信技术有限责任公司 | A method to realize time division synchronous CDMA repeater power saving |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2798502C1 (en) * | 2022-10-05 | 2023-06-23 | Акционерное Общество "Национальный институт радио и инфокоммуникационных технологий" (АО "НИРИТ") | Method for organizing cellular communications using a mobile repeater |
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