CN1162014C - Method for estimating distance of mobile terminal in digital mobile communication system - Google Patents
Method for estimating distance of mobile terminal in digital mobile communication system Download PDFInfo
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- CN1162014C CN1162014C CNB991168216A CN99116821A CN1162014C CN 1162014 C CN1162014 C CN 1162014C CN B991168216 A CNB991168216 A CN B991168216A CN 99116821 A CN99116821 A CN 99116821A CN 1162014 C CN1162014 C CN 1162014C
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Abstract
The present invention discloses a method for estimating the distance between a mobile terminal and a base station in a digital mobile communication system, wherein after a base station receives information which is firstly transmitted from a mobile terminal, the information is used for estimating an initial distance between the mobile terminal and the base station, and then the mobile terminal is informed an advanced relative time for transmitting information next time; in the following time, a time offset is calculated again at every time interval to compensate corresponding changes which need to be done by time advanced quantity which is caused by the movement of the mobile terminal, and simultaneously, the distance offsets of the mobile terminal can be obtained according to the time offsets so as to obtain the distance between the mobile terminal and the base station in real time. Distance estimation which is carried out by the method can obviously shorten search time, and estimating accuracy is high.
Description
The present invention relates to communication technical field, relate in particular to the method for distance of mobile terminal in a kind of estimative figure mobile communication system.
In mobile communication system, digital information generally is the transmission of branch frame, because the mobility of portable terminal will make that its aerial time delay that arrives base station information at every turn all may be different, be the distance of calculation base station like this to portable terminal, then must before each demodulation, once search for, just can demodulate digital information, and then extrapolate the distance of portable terminal, the program complexity.So traditional way is not in real time calculated the distance of portable terminal, and determines in real time just which sub-district this portable terminal is subordinated to, specifically be to be unknowable in which position of which sub-district.
Distance of mobile terminal estimation approach in the digital mobile communication system that a kind of search utility is simple fast, estimation distance of mobile terminal precision is high that the objective of the invention is to provide in order to overcome the existing deficiency that distance of mobile terminal is estimated.
Realize that technical scheme of the present invention is: the method for estimating distance of mobile terminal in a kind of digital mobile communication system, be characterized in, may further comprise the steps:
1. the data-evaluation that utilizes the base station to receive that portable terminal is sent first goes out the initial distance of portable terminal;
2. calculate the time offset that portable terminal sends information;
3. calculate the ranging offset of portable terminal and base station according to time offset, and then draw the real-time distance of portable terminal and base station;
2. and 3. 4. constantly repeating step can obtain the portable terminal in any moment and the real-time distance between the base station.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the step 1. method of the initial distance of described definite portable terminal is:
1.-a. judges whether to insert at random received signal;
1.-if b. inserts at random, then utilize the characteristics of training sequence correlation to calculate the initial distance of portable terminal.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the step 2. preparation method of described time offset is:
2.-a, base station send to portable terminal with the 1. resulting initial time lead of step, and notice portable terminal next frame shifts to an earlier date the corresponding time and sends;
2.-b, base station receive next time portable terminal on when sending out data, calculate corresponding time offset.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the 4. described acquisition portable terminal of step is meant with respect to the distance method of base station: time offset and the addition of initial time lead with 3. step obtains obtain the Timing Advance that next time will be notified portable terminal in the base station; The time offset of utilizing step 3. to obtain simultaneously can draw the ranging offset amount of portable terminal with respect to the base station; And then calculate the distance of portable terminal with respect to the base station.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the described method that inserts received signal at random that judges whether is meant the energy method relatively that relies on, this method is: set a comparison threshold m, the span of this thresholding m is between 80%～95%; If satisfy condition:
Then think the received signal that inserts at random.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the described correlation of training sequence of utilizing estimates that the computing formula of the initial distance of portable terminal is:
Described n be in the demodulating process of information sequence by the correlation of the sequence of calculation calculate this base station receiving sequence and the bit offset between consensus sequence position, base station.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: consensus sequence position, described base station is the position that the portable terminal up sequence that the base station receives during with respect to the base station non-displacement should be in.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: described time offset is meant: the bit offset between the position of this base station receiving sequence and consensus sequence position, base station.
The method of estimating distance of mobile terminal in above-mentioned a kind of digital mobile communication system, wherein: the computing formula of the real-time distance of described portable terminal is:
Last distance+time offset * corresponding the ranging offset of unit interval side-play amount with the base station of the real-time distance of portable terminal=portable terminal.
Because the present invention has adopted above technical scheme, use the notion of the Timing Advance of GSM in digital mobile communication system, after the information that portable terminal puts forward is first received in the base station, utilize this data-evaluation to go out the initial distance of portable terminal, notify portable terminal to send then next time and shift to an earlier date the corresponding time; Then calculate a time migration later at set intervals again, the corresponding change that compensation should be made because of the mobile Timing Advance that causes of portable terminal, simultaneously by calculating ranging offset, calculate the residing position of portable terminal in any moment, and shortening search time, program simplification, estimated accuracy are improved.
Now with the following Examples and accompanying drawing, further specify concrete feature of the present invention, performance.
Fig. 1 is the envelope diagram of conventional burst sequences;
Fig. 2 is the envelope diagram of access burst sequence at random;
Fig. 3 is the envelope diagram of noise.
The present invention is a distance of mobile terminal estimation approach in a kind of digital mobile communication system, its core content is exactly after the information that portable terminal puts forward is first being received in the base station, utilize this data-evaluation to go out the initial distance of portable terminal, notify portable terminal to send then next time and shift to an earlier date the corresponding time; Then calculate a time migration later at set intervals again, the corresponding change that compensation should be made because of the mobile Timing Advance that causes of portable terminal.
The range estimation method that the present invention proposes is applicable to all digital mobile communication systems.Be that example is described in detail now with the GSM digital cellular mobile communication systems.
In the gsm system, it is the random access sequence of sending out on the portable terminal that the base station needs first up sequence of demodulation, and the base station also is based on this receiving sequence to the range estimation of portable terminal.So in fact the initial distance estimation process is carried out in two steps: the first step, judge that whether this received signal is for inserting at random; In second step,, utilize the initial distance of the characteristics estimation portable terminal of training sequence correlation if insert at random.
At first, whether judge this received signal for inserting at random, the present invention proposes a kind of comparative approach of envelope energy, and this method is: set a comparison threshold m, if satisfy condition:
Then think the received signal that inserts at random.
In gsm system, when the base station when corresponding time slot is handled random access information, the information of receiving might be insert at random, also might be to disturb or conventional burst sequences, if we just distinguished before the demodulation search, can save a large amount of time for demodulating process.
The conventional burst of Fig. 1～Figure 3 shows that, the envelope diagram of access burst and noise at random.As can be seen from Figure, the energy sum (the energy sums of 87 bits) of the main bit that obtains of access burst occupies the overwhelming majority of whole section all bit energy sums of burst (156 bit sum) at random, conventional burst sequences and noise then do not have these characteristics, and the Energy distribution of their 156 bits is average.The aforementioned calculation energy method relatively that therefore can rely on the present invention to propose, promptly utilize the characteristics difference of other burst sequences and noise signal (promptly with) of access burst sequence, just utilize the characteristics on centre 87 bits of main concentration of energy in 156 bits altogether of access burst, whether distinguish received signal for inserting at random: set a comparison threshold m, if meet the following conditions:
So, think that then received signal is to insert at random, this m value can obtain jointly by method theoretical and experiment, and its span is between 80%～95%.Such as when establishing thresholding m and be 90%, can from received signal, distinguish access burst well.
Then, utilize the correlation of training sequence to estimate the initial distance of portable terminal, the present invention provides the formula of estimated distance, and this formula is:
Wherein n be in the demodulating process of information sequence by the correlation of the sequence of calculation calculate this base station receiving sequence and the bit offset of consensus sequence position, base station, be known conditions.Consensus sequence position, described base station is the position that the portable terminal up sequence that the base station receives during with respect to the base station non-displacement should be in.
For example, in gsm system, information is the timesharing transmission, and each time slot has 156.25 bits, every time slot duration 0.577ms, every bit duration 3.69us.But this moment, base station and do not know portable terminal and own distance was thereby prior and do not know how long this up sequence has postponed on earth aloft.A search will be done apart from value condition (just aerial time delay situation) to all possible in the base station this moment, with this up sequence that receive is up till now compared the no situation of time-delay how many bits that staggered on earth when aerial, and then could notify portable terminal next frame data to shift to an earlier date the transmission of how many bits time.Can estimate the initial distance of portable terminal with this bit number, method is as follows:
Suppose that the time delay amount of bits is n, the distance between portable terminal and the base station is d, considers that time delay is two-way, and electromagnetic wave is with light velocity propagation, and the above computing formula of substitution is:
GSM stipulates that its communication distance is 0 ~ 35 kilometer, learns from above calculating, and when distance d was 35 kilometers, calculating time-delay was 63.2 bits, and we are similar to and think 63 bits.That is to say that if we all search for 0 ~ 63 these 64 kinds of possible time-delay situations one time, we necessarily can search the position that can correctly demodulate useful information so.According to top computing formula, we can learn the initial distance of distance of mobile terminal base station; And this time-delay of this position correspondence our the initial time lead that will seek just, portable terminal will be handed down to this information with road control information the inside in the base station, and notice portable terminal next frame shifts to an earlier date the corresponding time and sends.
The base station when receiving upstream data next time, and available same computational methods calculate corresponding time offset, and computing time, the method for side-play amount was: calculate the position of this base station receiving sequence and the bit offset between consensus sequence position, base station.The result that this time side-play amount and last time, the Timing Advance addition obtained is exactly the Timing Advance that next time will be notified portable terminal in the base station.With the computing formula below the time offset substitution, we just can calculate portable terminal in real time with respect to the distance of base station.The computing formula of the real-time distance of described portable terminal is: the last distance+time offset * corresponding ranging offset of unit interval side-play amount with the base station of the real-time distance of portable terminal=portable terminal.Wherein the ranging offset of unit interval side-play amount correspondence can utilize the initial distance computing formula of front to obtain, and by following institute formula, the ranging offset of time offset correspondence is:
This scheme provided by the invention is a kind of through the theoretical effective estimation means that facts have proved, this estimation both can be located in real time to some portable terminals, also can measure the scope that the somewhere network effectively covers, estimate the quality of local networks, simultaneously, also can follow the tracks of, be of wide application certain specific location of mobile users.
Claims (9)
1. the method for estimating distance of mobile terminal in the digital mobile communication system is characterized in that, may further comprise the steps:
1. the data-evaluation that utilizes the base station to receive that portable terminal is sent first goes out the initial distance of portable terminal;
2. calculate the time offset that portable terminal sends information;
3. calculate the ranging offset of portable terminal and base station according to time offset, and then draw the real-time distance of portable terminal and base station;
2. and 3. 4. constantly repeating step can obtain the portable terminal in any moment and the real-time distance between the base station.
2. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1 is characterized in that: the step 1. method of the initial distance of described definite portable terminal is:
1.-a. judges whether to insert at random received signal;
1.-if b. inserts at random, then utilize the characteristics of training sequence correlation to calculate the initial distance of portable terminal.
3, the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1, it is characterized in that: the step 2. preparation method of described time offset is:
2.-a, base station send to portable terminal with the 1. resulting initial time lead of step, and notice portable terminal next frame shifts to an earlier date the corresponding time and sends;
2.-b, base station receive next time portable terminal on when sending out data, calculate corresponding time offset.
4, the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1, it is characterized in that: the 4. described acquisition portable terminal of step is meant with respect to the distance method of base station:
Time offset and the addition of initial time lead with 3. step obtains obtain the Timing Advance that next time will be notified portable terminal in the base station; The time offset of utilizing step 3. to obtain simultaneously can draw the ranging offset amount of portable terminal with respect to the base station; And then calculate the distance of portable terminal with respect to the base station.
5. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 3, it is characterized in that: the described method that inserts received signal at random that judges whether is meant the energy method relatively that relies on, this method is: set a comparison threshold m, the span of this thresholding m is between 80%～95%; If satisfy condition:
Then think the received signal that inserts at random.
6. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1 is characterized in that: the described correlation of training sequence of utilizing estimates that the computing formula of the initial distance of portable terminal is:
Described n be in the demodulating process of information sequence by the correlation of the sequence of calculation calculate this base station receiving sequence and the bit offset between consensus sequence position, base station.
7. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 6 is characterized in that: consensus sequence position, described base station is the position that the portable terminal up sequence that the base station receives during with respect to the base station non-displacement should be in.
8. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1, it is characterized in that: described time offset is meant: the bit offset between the position of this base station receiving sequence and consensus sequence position, base station.
9. the method for estimating distance of mobile terminal in a kind of digital mobile communication system according to claim 1, it is characterized in that: the computing formula of the real-time distance of described portable terminal is:
Last distance+time offset * corresponding the ranging offset of unit interval side-play amount with the base station of the real-time distance of portable terminal=portable terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB991168216A CN1162014C (en) | 1999-08-30 | 1999-08-30 | Method for estimating distance of mobile terminal in digital mobile communication system |
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| CNB991168216A CN1162014C (en) | 1999-08-30 | 1999-08-30 | Method for estimating distance of mobile terminal in digital mobile communication system |
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| US7363044B2 (en) * | 2002-09-30 | 2008-04-22 | Motorola, Inc. | System and method for aiding a location determination in a positioning system |
| WO2013063789A1 (en) * | 2011-11-04 | 2013-05-10 | Beijing Weibang Yuanhang Wireless Technology Co., Ltd | Data communication methods and apparatus |
| CN102711273B (en) * | 2012-04-19 | 2015-02-04 | 北京创毅讯联科技股份有限公司 | Random access method in wireless network and user equipment |
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