CN1378392A - identifying method and device for non-visual route in CDMA cellular mobile communication system - Google Patents
identifying method and device for non-visual route in CDMA cellular mobile communication system Download PDFInfo
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Abstract
This invention relates to an identifying method and its device of non-video path in a CDMA cellular mobile communication system, including the following steps: first input measurement values of multi-path amplitude distribution, then according to 1) the amplitude of the first path; 2) relative fading trend among the paths; and 3) time-delay augmentobility of multi-paths to make judgement to the identifcations of non-video paths separately combined with the above information then to make a unified judgement based on the above three judgements. This invention has the following advantages: 1) high accurate identification rate, 2) as compared with the existing methods, this method does not need to accumulate historical data with short response time sand 3) suitable for the location of UE either mobile or immobile.
Description
The present invention relates to a kind of CDMA (code division multiple access) but the recognition methods of non-visual path and device in the cell mobile communication systems.
In the cell mobile communication systems, travelling carriage (MS) positioning accuracy can seriously reduce owing to the existence of non-visual route (NLOS), in order to guarantee under urban environment, the required precision that FCC (FCC) proposes to be satisfied in the location of travelling carriage, mobile station locating system need be taked corresponding N LOS error corrective measure, the NLOS recognition technology then is the important evidence that NLOS corrects, and NLOS identification accurately can improve the rectification effect of NLOS position error.
As shown in Figure 1, travelling carriage 102 can receive the signal of four base stations 101, in these four base stations, have only and have visual route (LOS) path 103,104,105 between base station 2, base station 3, base station 4 and the travelling carriage 102, base station 1 all is the NLOS path to the path 106,107 of travelling carriage 102, which has the LOS path if in carrying out can determining when location of mobile station is estimated the base station signal (as pilot signal) that travelling carriage receives, so, just can utilize measurement result on the LOS path to improve the precision of location estimation whole or in part; Even if drawn the conclusion that no LOS path exists, also can utilize this conclusion to carry out NLOS error rectification targetedly by NLOS identification.
Utilize the NLOS recognition technology, but the measuring-signal of from a plurality of latency measurement signals, picking out visual path (LOS) position, such processing can reach following effect: 1) can carry out location estimation accurately to MS when having the LOS path; 2) position that can utilize position that LOS obtains and temporal correlation to correct MS under the NLOS situation; 3) can when no LOS, select targetedly location-estimation algorithm to correct the NLOS position error effectively.
Existing mobile position estimation NLOS recognition technology is at first proposed in the paper that is entitled as " non-visual route location estimation " by M.P.Wylie.In September, 1997, M.P.Wylie has submitted the patent application that the NLOS error is corrected in a solution mobile position estimation to USPO, US5, and 974,329, this patent is with the key element of NLOS recognition technology as its invention of formation.1998, people such as J.Borras adopted the binary hypothesis test method that the NLOS method of discrimination of M.P.Wylie has been made theory analysis.
Above-mentioned basic ideas about the NLOS recognition methods are: 1) travelling carriage that each base station measurement is obtained carries out long record to the distance between this base station; 2) mass data of record is carried out smoothing processing; 3) utilize this fact of measurement variance (this variance is measured difference by system's mistake and caused) when measuring variance (with respect to the data after level and smooth, this variance is by special seized with terror the causing of landforms) under the NLOS situation to carry out NLOS identification much larger than LOS.
There is following shortcoming in above-mentioned recognition methods:
1) owing to the judgement of employing dualism hypothesis, and is difficult to obtain NLOS error model accurately, is difficult to the correct recognition rata that reaches high;
2) owing to need utilize long measurement data, this can produce big time delay, is difficult to satisfy the requirement of mobile position estimation to the response time;
3) though unsuccessful time of position is changed or but the position changes in time and do not have the situation that LOS occurs, this method lost efficacy, this has just limited the range of application of this method widely.
The object of the present invention is to provide a kind of recognition methods and device that can obtain non-visual route in the short code vision multiple address cellular mobile communication system of correct recognition rata height, response time.
To achieve these goals, the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system provided by the present invention, comprise the following steps: at first to import the measured value of multipath amplitude distribution, then according to the amplitude judgement in first footpath: obtain the time of advent two-way time that reports according to system, measure the received power of input travelling carriage and the transmitting power of base station for the multipath amplitude distribution of utilizing down link to carry out; For the multipath amplitude distribution measurement result of utilizing up link to carry out, then import the transmitting power of travelling carriage and the received power of base station; Suppose that first footpath is non-visual route, whether the power in first footpath that relatively receives satisfies the decline relation under the non-visual route condition: whether its amplitude satisfies than the free space decline is lower than default threshold value, if satisfy, just is judged to non-visual route, otherwise, just be judged to visual route; Receive the result of non-visual route identification.
To achieve these goals, the present invention also can realize by following technical scheme, it is the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system: the measured value of at first importing the multipath amplitude distribution, carry out non-visual route identification according to relative decline trend characteristic between each footpath of multipath amplitude distribution embodiment then, obtain the result of non-visual route identification at last.
In the recognition methods of non-visual route, carry out the method that the non-visual route recognition methods can be adopted the decline gradient according to relative decline trend characteristic between each footpath of multipath amplitude distribution embodiment: (1) carries out curve fitting to the amplitude in each footpath in above-mentioned code vision multiple address cellular mobile communication system; (2) ask the gradient of the position in corresponding each footpath of matched curve; (3) the gradient addition that the position may be appearred in each footpath obtains the gradient summation of amplitude distribution; (4) determine a decline gradient as thresholding from first footpath to the N footpath, according to the decline gradient of multipath amplitude distribution, if the decline gradient just is judged to LOS greater than this thresholding, otherwise, just be judged to NLOS;
In above-mentioned code vision multiple address cellular mobile communication system in the recognition methods of non-visual route, carry out the non-visual route recognition methods according to relative decline trend characteristic between each footpath of multipath amplitude distribution embodiment and can also adopt N n dimensional vector n method: construct a base vector, determine whether to be non-visual route by the multipath amplitude distribution of realistic survey and the distance of base vector.
In the recognition methods of non-visual route, the multipath amplitude distribution decline trend of finding the solution actual measurement can adopt segment processing in above-mentioned code vision multiple address cellular mobile communication system.
To achieve these goals, the present invention also can realize by following technical scheme, it is the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system: the measured value of at first importing the multipath amplitude distribution, carry out the identification judgement of non-visual route then according to the time delay autgmentability:, set up the relation of a time delay autgmentability and distance according to the field test data of storage; Concern as the subsidiary conditions of judging that with this after obtaining the time of advent, if the result of decline gradient judgement in amplitude, each footpath is a non-visual route, and the time delay autgmentability also shows and surpassed certain predetermined threshold, then shows it is non-visual route; If the time delay autgmentability surpasses certain predetermined threshold, still the result who adjudicates with the decline gradient in amplitude, each footpath is as the criterion.
To achieve these goals, the present invention also can realize by following technical scheme, it is the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system: the measured value of at first importing the multipath amplitude distribution, then respectively according to first the footpath amplitude, the relative decline trend characteristic and the time delay autgmentability of multipath between each footpath, in conjunction with priori data, carry out the judgement of non-visual route identification, wherein: the amplitude decision method is: 1) obtain the time of advent two-way time that reports according to system, measure the received power of input travelling carriage and the transmitting power of base station for the multipath amplitude distribution of utilizing down link to carry out; For the multipath amplitude distribution measurement result of utilizing up link to carry out, then import the transmitting power of travelling carriage and the received power of base station; 2) suppose that first footpath is non-visual route, whether the power in first footpath that relatively receives satisfies the decline relation under the non-visual route condition: whether its amplitude satisfies than the free space decline is lower than default threshold value, if satisfy, just is judged to non-visual route, otherwise, just be judged to visual route.Time delay autgmentability decision method is: 1) according to the field test data of storage, set up the relation of a time delay autgmentability and distance; 2) concern as the subsidiary conditions of judging with this that after obtaining the time of advent, if the result of decline gradient judgement in amplitude, each footpath is a non-visual route, and the time delay autgmentability also shows and surpassed certain predetermined threshold, then shows it is non-visual route; If the time delay autgmentability surpasses certain predetermined threshold, still the result who adjudicates with the decline gradient in amplitude, each footpath is as the criterion; Three kinds of court verdicts to output are comprehensively adjudicated: consequence has plural when being output as non-visual route, then is judged to non-visual route.
To achieve these goals, the present invention also can provide the recognition device of the non-visual route in a kind of code vision multiple address cellular mobile communication system, comprise: Multipath searching and measuring unit, from mobile station side or base station side received signal, finish the measurement in the relative moment of the amplitude in Multipath searching, tracking, each footpath and arrival; The priori data memory cell, the non-visual route channel that the storage on-the-spot test obtains and the data of visual route channel multi-path amplitude distribution; The integrated treatment unit, reading of data from Multipath searching and measuring unit and priori data memory cell respectively, according to the measured value of input multipath amplitude distribution, carry out the comprehensive judgement of the non-visual route identification of decline trend characteristic relative between each footpath of amplitude, the embodiment of multipath amplitude distribution and time delay autgmentability.
The recognition device of non-visual route in above-mentioned a kind of code vision multiple address cellular mobile communication system, it comprises that also transmitting power is measured and correcting unit, is used to realize the measurement of transmitting power and feeder loss is corrected, and the result is reported the integrated treatment unit.
The technical scheme of above-mentioned non-visual route identification utilized the multipath amplitude distribution, thereby the advantage that has is: 1) correct recognition rata height; 2) and existing method compare, need not accumulate historical data, the response time is short; 3) both be applicable to the location of mobile UE, also be applicable to the location of non-moving UE.
The present invention is further illustrated below in conjunction with embodiment and accompanying drawing.
Fig. 1 is LOS and the NLOS path schematic diagram between mobile to base station;
Fig. 2 is the structural representation that carries out the NLOS recognition device of multipath distribution measuring on down link;
Fig. 3 is the structural representation that carries out the NLOS recognition device of multipath distribution measuring on up link;
Fig. 4 is the experimental data schematic diagram of existing LOS propagation path loss and NLOS propagation path loss;
Fig. 5 is the curve synoptic diagram of the difference of existing NLOS multipath distribution and the distribution of LOS multipath;
Fig. 6 is a kind of NLOS recognizer of the present invention flow chart.
As shown in Figure 4, it is according to the NLOS channel of existing experimental result drafting and the path loss characteristics curve of LOS channel, corresponding to same propagation distance, the representative value of the decline of NLOS channel is lower more than 60 decibels than LOS channel, in addition, general LOS channel fading is lower 2～11 decibels than free space, and the NLOS channel fading is than the low 13-30 decibel of free space.LOS channel and the NLOS channel this significant difference on path loss characteristics can be used as a foundation of the identification of NLOS/LOS.
Referring to Fig. 5, it is according to the NLOS channel of existing experimental data drafting and the multipath distribution curve of LOS channel, this figure had both shown NLOS channel and the difference of LOS channel on the time delay extended attribute, also showed NLOS channel and the LOS channel difference in the amplitude fading in footpath.Fig. 5 shows, each footpath amplitude relatively flat of NLOS channel, and each footpath amplitude of LOS channel then becomes the state that declines fast.The difference of these two aspects can be used as two other foundation of carrying out NLOS/LOS identification.
Comprehensive utilization NLOS channel can be realized the difference to NLOS aspect the relative distribution of the path loss of the first footpath amplitude, each footpath amplitude, time delay expansion distribution and the difference of LOS channel.
1 the present invention utilizes the algorithm flow of multipath amplitude distribution identification NLOS to comprise
1.1 adjudicate according to amplitude
Referring to Fig. 6, at first import the measured value of multipath amplitude distribution, step 601 is carried out step 602,603 described amplitude judgements then.Step 602 is to obtain TOA (time of advent) according to the RTT (two-way time) that system reports, and input range is adjudicated emission (or reception) power that needs, measure the received power of input travelling carriage and the transmitting power of base station for the multipath amplitude distribution of utilizing down link to carry out; For the multipath amplitude distribution measurement result of utilizing up link to carry out, then import the transmitting power of travelling carriage and the received power of base station.Step 603 item is to implement NLOS identification, basic principle is: be assumed to be NLOS (distance at this moment is real distance), under this assumed condition, whether the power in first footpath that relatively receives satisfies the decline relation under the NLOS condition: whether its amplitude satisfies lower more than 12 decibels than the free space decline.If satisfy, just be judged to NLOS, otherwise, just be judged to LOS.
Formula (7) is the path loss formula of free space, when the calculating path loss, the distance (TOA of adjacent base station calculates by the TOA of TDOA (time of advent is poor) and Serving cell) that adopts TOA to measure apart from d in the formula, owing to from the d that TOA obtains, can comprise the NLOS error, should regard this distance as corresponding with the NLOS distance, therefore, should be with the free space path loss that this distance obtains as the judgement threshold of NLOS decline, if the loss that actual measurement obtains (according to measuring parameter) is than more than the low 13dB of path loss that is obtained by formula (7), just be judged to the NLOS path, otherwise, just be judged to the LOS path.
1.2 decline trend judgement according to the footpath
On the basis of step 601, step 606 is carried out NLOS identification according to relative fading characteristic between each footpath of multipath amplitude distribution embodiment, concrete grammar can have multiple, such as: 1) method of decline gradient method judgement decline trend can be asked the decline gradient of multipath PROFILE (amplitude distribution) as follows: (1) carries out curve fitting to the amplitude in each footpath; (2) ask the gradient of the position in corresponding each footpath of matched curve; (3) the gradient addition that the position may be appearred in each footpath obtains the gradient summation of PROFILE.
Determine a decline gradient as thresholding from first footpath to the N footpath, if the decline gradient just is judged to LOS greater than this thresholding, otherwise, just be judged to NLOS;
2) base vector of N n dimensional vector n method structure determines whether to be NLOS by the PROFILE of realistic survey and the distance of base vector.
Because the diversity of multipath PROFILE in order to improve the accuracy rate of NLOS identification, needs to consider the PROFILE that receives is carried out segment processing.
1.3 adjudicate according to the time delay autgmentability
On the basis of step 601, step 605 is carried out NLOS identification according to the time delay extended attribute.With step 603,605 similar, 605 identification judges it is field test data according to storage in 607, set up the relation of a time delay autgmentability and distance, concern as the subsidiary conditions of judging NLOS with this, after obtaining TOA, if the result of decline gradient judgement in amplitude, each footpath is NLOS, and the time delay autgmentability also shows and has surpassed certain predetermined threshold, just can fully show it is NLOS; But, if the time delay autgmentability surpasses certain predetermined threshold, can not therefore be judged to LOS, still will be as the criterion with the result of amplitude, each decline gradient judgement directly this moment.
1.4 comprehensive judgement
In real system, may be difficult to obtain the TOA value, can only utilize this moment the described method of decline trend in footpath to carry out NLOS identification.
2 the present invention utilize the recognition device of the NLOS of multipath amplitude distribution
NLOS recognition device of the present invention has two kinds of versions, a kind of is corresponding to the structure of carrying out the multipath distribution measuring on down link, this structure as shown in Figure 2, another kind is that this structure is as shown in Figure 3 corresponding to the structure of carrying out the multipath distribution measuring on up link.The main distinction of two kinds of structures is to obtain the position difference of multipath amplitude distribution, first kind of measurement of carrying out the multipath amplitude distribution on travelling carriage, second kind of measurement of carrying out the multipath amplitude distribution at network side.Two kinds of arrangement works processes are similar, only first kind of structure are illustrated.
Carrying out the NLOS recognition device of multipath amplitude measurement on down link is made up of Multipath searching and measuring unit 213, transmitting power measurement and correcting unit 210, priori data memory cell 212, integrated treatment unit 211 4 parts.Wherein, Multipath searching and measuring unit 213 are finished the measurement in the relative moment of the amplitude in Multipath searching, tracking, each footpath and arrival; Transmitting power measurement and correcting unit 210 are realized the measurement of transmitting powers (the code word power of pilot tone) and feeder loss are corrected; The NLOS channel that the 212 storage on-the-spot test of priori data memory cell obtain and the data of LOS channel multi-path amplitude distribution; Integrated treatment unit 211 is realized above-mentioned algorithm shown in Figure 6 and is discerned relevant measurement, controlled function with NLOS.
The request that integrated treatment unit 211 among Fig. 2 sends the reporting measurement number by the transmitter in the base station 203 and antenna duplexer 202, antenna 201 to travelling carriage (MS), this request signal arrives integrated treatment unit 208 through antenna 205, antenna duplexer 207, the receiver 209 of mobile station side.After 208 pairs of this request signal decodings in the integrated treatment unit of mobile station side, read desired data from Multipath searching and each footpath power measurement unit 213, and be reported to integrated treatment unit 211 in the base station through antenna 201, antenna duplexer 202 and the receiver 204 of transmitter 206, antenna duplexer 207, antenna 205 and base station side.
Integrated treatment unit 311 among Fig. 3 is by the transmitter 303 of base station side, antenna duplexer 302, antenna 301 sends the request signal that reports transmission power of mobile station to travelling carriage (MS), this request signal is through the antenna 305 of mobile station side, antenna duplexer 307, receiver 309 arrives the integrated treatment unit 308 of travelling carriage, integrated treatment unit 308 is measured with correcting unit 310 from transmitting power and is read desired data, and the transmitter 306 of process mobile station side, antenna duplexer 307, the antenna 301 of antenna 305 and base station side, antenna duplexer 302, receiver 304 is delivered to integrated treatment unit, base station 311.
When only utilizing relative decline between multipath to carry out NLOS identification, the NLOS recognition device can be made up of Multipath searching and measuring unit 213, priori data memory cell 212, integrated treatment unit 211 3 parts.
Claims (9)
1. the recognition methods of non-visual route in the code vision multiple address cellular mobile communication system comprises the following steps:
At first import the measured value of multipath amplitude distribution, adjudicate according to the amplitude in first footpath then:
Obtain the time of advent two-way time that reports according to system, for utilizing down link to carry out
The multipath amplitude distribution measure the received power of input travelling carriage and the transmitting power of base station; For
The multipath amplitude distribution measurement result of utilizing up link to carry out is then imported the transmitting power of travelling carriage
Received power with the base station;
Suppose that first footpath is non-visual route, whether the power in first footpath that relatively receives satisfies non-
Decline relation under the visual route condition: whether its amplitude satisfies is lower than default than the free space decline
Threshold value, if satisfy, just be judged to non-visual route, otherwise, just be judged to visual route;
Receive the result of non-visual route identification.
2. the recognition methods of non-visual route in the code vision multiple address cellular mobile communication system comprises the following steps:
At first import the measured value of multipath amplitude distribution, carry out non-visual route identification according to relative decline trend characteristic between each footpath of multipath amplitude distribution embodiment then, obtain the result of non-visual route identification at last.
3. the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system according to claim 2, it is characterized in that relative decline trend characteristic is carried out the method that the non-visual route recognition methods can be adopted the decline gradient between described each footpath of embodying according to the multipath amplitude distribution:
(1) amplitude to each footpath carries out curve fitting;
(2) ask the gradient of the position in corresponding each footpath of matched curve;
(3) the gradient addition that the position may be appearred in each footpath obtains the gradient summation of amplitude distribution;
(4) determine a decline gradient as thresholding from first footpath to the N footpath, according to the decline gradient of multipath amplitude distribution, if the decline gradient just is judged to LOS greater than this thresholding, otherwise, just be judged to NLOS;
4. the recognition methods of non-visual route in a kind of code vision multiple address cellular mobile communication system according to claim 2, it is characterized in that relative decline trend characteristic is carried out the non-visual route recognition methods and can be adopted N n dimensional vector n method between described each footpath of embodying according to the multipath amplitude distribution:
Construct a base vector, determine whether to be non-visual route by the multipath amplitude distribution of realistic survey and the distance of base vector.
5. the recognition methods of non-visual route is characterized in that in a kind of code vision multiple address cellular mobile communication system according to claim 3, and the multipath amplitude distribution decline trend of finding the solution actual measurement can adopt segment processing.
6. the recognition methods of non-visual route in the code vision multiple address cellular mobile communication system comprises the following steps: at first to import the measured value of multipath amplitude distribution to carry out the identification judgement of non-visual route then according to the time delay autgmentability:
According to the field test data of storage, set up the relation of a time delay autgmentability and distance;
Concern as the subsidiary conditions of judging that with this after obtaining the time of advent, if the result of decline gradient judgement in amplitude, each footpath is a non-visual route, and the time delay autgmentability also shows and surpassed certain predetermined threshold, then shows it is non-visual route; If the time delay autgmentability surpasses certain predetermined threshold, still the result who adjudicates with the decline gradient in amplitude, each footpath is as the criterion.
7. the recognition methods of non-visual route in the code vision multiple address cellular mobile communication system, comprise the following steps: at first to import the measured value of multipath amplitude distribution, then respectively according to the relative decline trend characteristic and the time delay autgmentability of multipath between the amplitude in first footpath, each footpath, in conjunction with priori data, carry out the judgement of non-visual route identification, wherein: the amplitude decision method is:
1) obtains the time of advent two-way time that reports according to system, for utilizing down link to advance
The multipath amplitude distribution of row is measured, the received power of input travelling carriage and the transmitting power of base station; Right
In the multipath amplitude distribution measurement result of utilizing up link to carry out, then import the emission merit of travelling carriage
The received power of rate and base station; 2) suppose first footpath for non-visual route, relatively receive first
Whether the power in footpath satisfies the decline relation under the non-visual route condition: whether its amplitude satisfies ratio certainly
Be lower than default threshold value by spatial fading,, just be judged to non-visual route if satisfy, otherwise,
Just be judged to visual route; Time delay autgmentability decision method is:
1), sets up the relation of a time delay autgmentability and distance according to the field test data of storage; 2) concern as the subsidiary conditions of judging with this that after obtaining the time of advent, if the result of decline gradient judgement in amplitude, each footpath is a non-visual route, and the time delay autgmentability also shows and surpassed certain predetermined threshold, then shows it is non-visual route; If the time delay autgmentability surpasses certain predetermined threshold, still the result who adjudicates with the decline gradient in amplitude, each footpath is as the criterion;
Three kinds of court verdicts to output are comprehensively adjudicated: consequence has plural when being output as non-visual route, then is judged to non-visual route.
8. the recognition device of the non-visual route in the code vision multiple address cellular mobile communication system, it is characterized in that: it comprises:
Multipath searching and measuring unit from mobile station side or base station side received signal, are finished the measurement in the relative moment of the amplitude in Multipath searching, tracking, each footpath and arrival;
The priori data memory cell, the non-visual route channel that the storage on-the-spot test obtains and the data of visual route channel multi-path amplitude distribution;
The integrated treatment unit, reading of data from Multipath searching and measuring unit and priori data memory cell respectively, according to the measured value of input multipath amplitude distribution, carry out the comprehensive judgement of the non-visual route identification of decline trend characteristic relative between each footpath of amplitude, the embodiment of multipath amplitude distribution and time delay autgmentability.
9. the recognition device of non-visual route in a kind of code vision multiple address cellular mobile communication system according to claim 7, it is characterized in that, it also comprises transmitting power measurement and correcting unit, be used to realize the measurement of transmitting power and feeder loss is corrected, and the result is reported the integrated treatment unit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413374C (en) * | 2005-05-23 | 2008-08-20 | 华为技术有限公司 | Metering reporting method for loop time of radio link |
| CN101924594A (en) * | 2010-09-16 | 2010-12-22 | 华中科技大学 | Method for judging radio testing environment under the condition of external field |
| CN114640410A (en) * | 2020-12-16 | 2022-06-17 | 大唐移动通信设备有限公司 | Wireless channel type detection method and device thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413374C (en) * | 2005-05-23 | 2008-08-20 | 华为技术有限公司 | Metering reporting method for loop time of radio link |
| CN101924594A (en) * | 2010-09-16 | 2010-12-22 | 华中科技大学 | Method for judging radio testing environment under the condition of external field |
| CN101924594B (en) * | 2010-09-16 | 2012-12-26 | 华中科技大学 | Method for judging radio testing environment under the condition of external field |
| CN114640410A (en) * | 2020-12-16 | 2022-06-17 | 大唐移动通信设备有限公司 | Wireless channel type detection method and device thereof |
| CN114640410B (en) * | 2020-12-16 | 2023-12-08 | 大唐移动通信设备有限公司 | Wireless channel type detection method and device |
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