CN101707800A - Method and device for obtaining synchronization timing of GSM neighboring cell - Google Patents
Method and device for obtaining synchronization timing of GSM neighboring cell Download PDFInfo
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Abstract
The invention discloses a method for obtaining the synchronization timing of a GSM neighboring cell in a TD-SCDMA/GSM double-module system. The method comprises the following steps: the characteristic of good relevance of an SCH training sequence is utilized to obtain the synchronization timing of the GSM neighboring cell, UE utilizes the idle time of TD-SCDMA to receive the SCH sequence of the GSM neighboring cell, when the SCH sequence is received, the correlation is conducted on the received information sequence by taking 64 bit as unit till the obtained correlate valve is larger than a threshold value, the UE receives the subsequent 39 bit information sequence, then the latest received 142 bit information is taken as the SCH sequence to conduct subsequent decoding, determine the timing deviation, and obtain the synchronization timing. The invention also discloses a device for realizing the method, which comprises an idle time monitoring unit, an information sequence receiving unit, a correlation calculation unit, a threshold value calculation unit, a comparing unit, a decoding unit and a timing deviation obtaining unit. By adopting the method and the device, the time consumption of the synchronization timing of the GSM neighboring cell is greatly reduced, and the probability of false detection and missing detection is reduced.
Description
Technical field
The present invention relates to wireless communication field, obtain the method and the device of the adjacent sub-district of GSM synchronization timing in particularly a kind of TD-SCDMA/GSM dual mode system.
Background technology
In the TD-SCDMA/GSM dual mode system, when in TD-SCDMA pattern following time, need carry out synchronously and (Base Station IdentifyCode is called for short to its base station identity code the adjacent sub-district of GSM, BSIC) confirm, to guarantee to the gravity treatment of GSM adjacent cells or the success of switching.
Gsm system control multi-frame is 51 multi-frame structures, its structure chart such as Fig. 1, wherein F represents frame (the Frequency Correction Channel at frequency correction channel place, be called for short, FCCH), S represents frame (the Synchronization Channel abbreviation at synchronizing channel place, SCH), B represents frame (the Broadcast control channel abbreviation at Broadcast Control Channel place, BCCH), C represents the frame (Common control channel is called for short CCCH) at Common Control Channel place, on behalf of idle frame, I (be called for short, IDLE).
The burst of carrying FCCH information is called frequency correction bursts and (is called for short, FCB), its structure chart as shown in Figure 1, the information sequence of FCB is made up of the full null sequence of 148 bits, through minimum offset keying (the Gaussian-filtered Minimum Shift Keying of gaussian filtering, be called for short, GMSK) after the modulation, its baseband signal has following feature:
1, the baseband signal sequence is the sinusoidal signal sequence of the frequency single-frequency that is 67.7kHz;
2, the phase difference of former and later two information code elements of baseband signal sequence is a pi/2;
According to the feature of above baseband signal, can find the FCB sequence.
The burst of carrying SCH information is called Synchronization Burst (SynchronizationBurst, be called for short, SB), its structure chart as shown in Figure 2, it is made up of 148 bit informations, 64 bits are fixing SCH training sequence (Training Sequence wherein, be called for short TS), each 39 bit of training sequence both sides are used to carry this GSM sub-district BSIC and frame number information, each 3 bit of two ends are the tail bit, and its value is zero.
According to structure chart, in dual mode system, the synchronization timing basic skills that terminal is obtained the GSM adjacent cells is:
At first, dual-mode terminal is sought FCB on the main carrier frequency of GSM adjacent cells, determines the reception timing of FCB sequence;
Secondly, according to FCB and SB sequential reception relativeness regularly among Fig. 1 gsm system control multi-frame structure figure, the reception timing of calculating the SB sequence;
At last, regularly receive the SB sequence, and this SB sequence is deciphered the frame number information that obtains the adjacent sub-district of this GSM, obtain synchronization timing with the adjacent sub-district of this GSM according to the reception that calculates.
Because regularly there is certain deviation in the reception of FCB sequence, causes SB sequential reception also to have certain error, can cause the SB sequence decoding error to occur, the time that has increased amount of calculation and obtained the adjacent sub-district of GSM synchronization timing.The deviation of FCB and SB sequence is uncertain simultaneously, can cause control flow complexity height.
Datang Mobile Communication Apparatus Co., Ltd's disclosed patent application on February 11 in 2009 " obtaining method, device and the portable terminal of the adjacent sub-district of GSM synchronization timing " (number of patent application: 20071012016.X) disclose the method that the good characteristic of a kind of SCH of utilization training sequence correlation is obtained the synchronization timing of the adjacent sub-district of GSM:
1, utilizes the free time of TD, receive the information sequence of the adjacent sub-district of GSM;
2, utilize the SCH sequence of precognition to slide relevant with the information sequence that receives, find out maximum related value and just establish threshold value relatively, if maximum related value comprises the information sequence of SCH sequence greater than just establishing threshold value in the information sequence that then receives, otherwise, do not comprise the SCH sequence;
3, determine according to Fig. 2 SB sequential structure schematic diagram whether the information sequence that receives has comprised complete SB sequence, when comprising complete SB sequence, extract this SB sequence, the row decoding of going forward side by side, when decoding is correct, determine the timing offset of SB sequence start position with respect to the information sequence original position;
4, obtain the synchronization timing of the adjacent sub-district of this GSM according to this deviation.
It is big that this method has solved the basic skills amount of calculation to a certain extent, obtain the adjacent long problem of sub-district synchronization timing time of GSM, but, because this method is to slide relevant to the information sequence that gets access to again after obtaining whole information sequence, with sliding relevant maximum and just establish thresholding and compare to determine whether comprise the SCH sequence, whole flow process is serial operation, still has the problem of length consuming time.Simultaneously, because when whether comprising the SCH sequence in the information sequence that judgement receives, this method has adopted the method for default fixed threshold, can't solve under channel circumstance changes faster situation, signal strength signal intensity also may change rapidly, causes default thresholding to lose efficacy, and produces the problem of flase drop or omission.Produce flase drop, then cause the invalid translator that calls, expend time in and power consumption; Produce omission, then miss the adjacent sub-district of a GSM synchronous opportunity, certainly will cause and continue synchronous time loss.
Summary of the invention
In view of this, the invention provides the method for the adjacent sub-district of a kind of GSM synchronization timing, with solution prior art synchronization timing length consuming time with owing to channel circumstance changes than the flase drop that comparatively fast produces or the problem of omission SCH training sequence.
Technical scheme of the present invention is:
1, utilize TD-SCDMA free time, user terminal (is called for short, UE) receives the information sequence of the adjacent sub-district of GSM;
2, user terminal UE is behind the information sequence that receives 63 bits, whenever newly receives the information sequence of 1 bit, and it is relevant that the information sequence that is about to 64 bits that receive recently and precognition SCH sequence are carried out, and obtains correlation Tk, the information sequence of 1 bit under receiving simultaneously;
3, when associated numbers of times during, whenever carry out associative operation one time, be about to a nearest correlation Tk and threshold T c and compare more than or equal to N;
4, as Tk during greater than Tc, UE stops to carry out associative operation, directly receives the information sequence of 39 follow-up bits;
5, the information sequence of UE 142 bits that will receive recently is as complete SB sequence;
6, UE deciphers the SB sequence that receives,
7, correct as deciphering, determine the timing offset of SB sequence start position with respect to the information sequence original position; Obtain the synchronization timing of the adjacent sub-district of this GSM according to described timing offset;
Wherein, the span of described N is the integer greater than 42, and k is the correlation sequence number.
Preferably, the acquisition methods of described threshold T c is,
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20.
Preferably, the value of described thresholding design factor is 14.
The invention also discloses the device of the adjacent sub-district of a kind of GSM of obtaining synchronization timing, comprising:
Free time monitoring means: whether the free time of detecting under the TD pattern begins or finishes;
Information receiving unit: finish by the bit cell received information sequence in TD pattern free time;
Correlation calculation unit: with 64 bits is the correlation that unit calculates precognition SCH sequence and reception information unit;
Threshold computation unit: the correlation according to precognition SCH sequence and reception information unit, calculate threshold T c;
Comparing unit: judge that whether precognition SCH sequence and up-to-date 64 units receive the correlation of information unit greater than threshold T c;
Decoding unit: the information unit sequence that comprises complete S B is deciphered;
The timing offset acquiring unit: timing offset is extracted in the correct back of decoding, obtains the adjacent sub-district of GSM synchronization timing.
Preferably, the method that described threshold computation unit is calculated threshold T c is,
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20.
Preferably, the value of described thresholding design factor is 14.
Method and apparatus of the present invention is owing to accept just to carry out correlation computations and judge whether to abandon the information unit that receives the earliest according to judged result at each information unit, finishes all calculating and just judge and finish simultaneously between at one's leisure.Reduced the time of prior art subsequent calculations and judgement; Simultaneously, if the complete SB of the interior appearance of free time section, SB occurs then stopping to receive later information unit fully, has not only reduced the time of subsequent calculations and judgement, also save the time of continuing to receive the follow-up unit, helped the task scheduling of dual mode system.
The method of the dynamic generator gate limit value that adopts, make threshold value to upgrade according to the variation of channel circumstance, the actual conditions that more meet channel circumstance have effectively solved channel circumstance and have changed than under the situation faster, produce the problem of flase drop or omission SCH training sequence.
Description of drawings
Fig. 1 is a control multi-frame structure schematic diagram in the gsm system
Fig. 2 is a FCB sequential structure schematic diagram
Fig. 3 is a SB sequential structure schematic diagram
Fig. 4 is the realization flow figure that obtains the method for the adjacent sub-district of GSM synchronization timing among the present invention
Fig. 5 is the apparatus structure schematic diagram that the present invention obtains the adjacent sub-district of GSM synchronization timing
Embodiment
Basic thought of the present invention is: utilize TD-SCDMA free time to receive the information sequence of the adjacent sub-district of GSM, the SCH sequence that is about to precognition in received information sequence is carried out relevant with the information sequence that receives, according to the correlation value calculation threshold value and judge whether up-to-date 64 information units are training sequences of SCH sequence, when determining to receive the SCH sequence, receive follow-up 39 remaining information unit; The SB sequence is deciphered, when decoding is correct, determined the timing offset of SB sequence start position with respect to the information sequence original position; Obtain the synchronization timing of the adjacent sub-district of this GSM according to described timing offset.
For clearly demonstrating technical scheme of the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
, be the realization flow figure that obtains the method for the adjacent sub-district of GSM synchronization timing among the present invention please referring to Fig. 4
Specifically may further comprise the steps:
S401 utilizes TD-SCDMA free time, and UE receives the information sequence of the adjacent sub-district of GSM, when receiving the information sequence of 64 bits, enters step S402;
S402 calculates the correlation Tk of precognition SCH sequence and up-to-date 64 bit information sequences, and receives next bit information sequence simultaneously;
S403 judges that associated numbers of times whether more than or equal to N time, enters step S404 in this way, otherwise enters step S402;
The span of described N is the integer more than or equal to 42.
S404 calculates threshold T c;
S405 judges that the last relevant correlation Tk whether greater than Tc, greater than threshold T c, enters step S407 as correlation Tk, otherwise enters step S406;
S406 judges whether free time finish, if not, enter step S402, otherwise, finishing received information sequence, flow process finishes;
S407 receives the follow-up sequence;
Whether S408 finishes the reception of follow-up 39 bit information sequences before finishing between judgement at one's leisure, the 142 bit information sequences that then will receive recently in this way are as complete SB sequence; Otherwise flow process finishes;
S409 deciphers complete SB sequence;
S410 judges whether decoding is correct, then enters S411 in this way; Otherwise flow process finishes;
S411 determines that the SB sequence start position with respect to the information sequence timing offset of position in fact, enters S412;
S412 obtains the synchronization timing of the adjacent sub-district of this GSM according to described timing offset.
Among the above-mentioned steps S404, calculate threshold T c and handle as follows:
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20, and preferred value is 14.
The invention also discloses the synchronous modifying device in a kind of adjacent sub-district of GSM in the past, Fig. 5 discloses the structural representation of this device embodiment one.
Comprise free time monitoring means 500, information receiving unit 501, correlation calculation unit 502, threshold computation unit 503, comparing unit 504, decoding unit 505, timing offset acquiring unit 506.
The course of work of this device and operation principle are:
Monitoring means 500 began and finished to arrange to send beginning and ending message to information receiving unit 501, correlation calculation unit 502, threshold computation unit 503, comparing unit 504 according to TD free time described free time; Information receiving unit 501, correlation calculation unit 502, threshold computation unit 503, comparing unit 504 are according to free time monitoring means 500 beginning, beginning and the end that the ending message decision is worked separately; After starting working, information receiving unit 501, received information sequence bitwise, and give correlation calculation unit 502 with the information sequence that receives; The information sequence bit number that correlation calculation unit 502 receives is during more than 63 bits, calculates precognition SCH sequence and the correlation Tk of the 64 bit information sequences that receive recently, and gives threshold computation unit 503 and comparing unit 504; The number that threshold computation unit 503 receives Tk is calculated the mean value of N Tk value of acquisition recently during more than or equal to N, as decision gate limit value Tc and give comparing unit 504; After comparing unit 504 receives Tk and Tc, both sizes relatively. when Tk＞Tc, announcement information receiving element 501 directly receives follow-up 39 unit information unit, and the notice correlation calculation unit is no longer carried out correlation computations to the information sequence of follow-up reception. information receiving unit 501 is complete receive follow-up 39 bit information sequences after, the new information sequence that receives is delivered to correlation calculation unit 502, correlation calculation unit 502 is no longer carried out correlation computations after receiving the 39 bit information sequences that information receiving unit 501 sends, the 142 bit information sequences that directly will receive are recently given decoding unit 505 together as the SB sequence, and notice free time monitoring means 500 Stop message receiving elements, correlation calculation unit, threshold computation unit, the work of comparing unit. decoding unit 505 receives the laggard row decoding of SB sequence, decoding error, then be left intact, decoding is correct, then notify timing offset acquiring unit 506 to obtain the fixed pattern deviation, finish obtaining the synchronization timing of the adjacent sub-district of this GSM.
Wherein, the method for described threshold computation unit 503 calculating threshold T c is:
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20, and preferred value is 14.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. method of obtaining the adjacent sub-district of GSM synchronization timing, utilize the free time of TD-SCDMA, receive GSM information of adjacent cells sequence, utilize the synchronous channel SCH sequence of predicting to determine to comprise the information sequence of SCH sequence, the SCH sequence of obtaining is deciphered, obtain the timing offset of Synchronization Burst SB sequence start position with respect to the information sequence original position, utilize this timing offset to obtain synchronization timing, it is characterized in that, receive GSM information of adjacent cells sequence, utilize the SCH sequence of precognition to determine that the information sequence that comprises the SCH sequence further comprises:
User terminal UE whenever newly receives the information sequence of 1 bit behind the information sequence that receives 63 bits, it is relevant that the information sequence that is about to 64 bits that receive recently and precognition SCH sequence are carried out, and obtains correlation Tk, the information sequence of 1 bit under receiving simultaneously;
When associated numbers of times during more than or equal to N, whenever carry out associative operation one time, be about to a nearest correlation Tk and threshold T c and compare;
As Tk during greater than Tc, UE stops to carry out associative operation, directly receives the information sequence of 39 follow-up bits;
The information sequence of 142 bits that UE will receive recently is as complete SB sequence;
Wherein, the span of described N is the integer greater than 42, and k is the correlation sequence number.
2. a kind of method of obtaining the adjacent sub-district of GSM synchronization timing according to claim 1 is characterized in that the acquisition methods of described threshold T c is:
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20.
3. a kind of method of obtaining the adjacent sub-district of GSM synchronization timing according to claim 2 is characterized in that the value of described thresholding design factor is 14.
4. a device that obtains the adjacent sub-district of GSM synchronization timing is characterized in that, comprising:
Free time monitoring means: whether the free time of detecting under the TD pattern begins or finishes;
Information receiving unit: finish by the bit received information sequence in TD pattern free time;
Correlation calculation unit: with 64 bits is the correlation that unit calculates precognition SCH sequence and reception information unit;
Threshold computation unit: the correlation according to precognition SCH sequence and reception information unit, calculate threshold T c;
Comparing unit: judge that whether precognition SCH sequence and up-to-date 64 units receive the correlation of information unit greater than threshold T c;
Decoding unit: the information unit sequence that comprises complete S B is deciphered;
The timing offset acquiring unit: timing offset is extracted in the correct back of decoding, obtains the adjacent sub-district of GSM synchronization timing.
5. a kind of device that obtains the adjacent sub-district of GSM synchronization timing according to claim 4 is characterized in that the method that described threshold computation unit is calculated threshold T c is:
Wherein, K is the associative operation number of times, and M is the thresholding design factor, and its span is 7～20.
6. a kind of device that obtains the adjacent sub-district of GSM synchronization timing according to claim 5 is characterized in that the value of described thresholding design factor is 14.
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| CN100508414C (en) * | 2003-12-19 | 2009-07-01 | 大唐移动通信设备有限公司 | Descending synchronous calibrating method and apparatus for TD-SCDMA system |
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| CN102123431A (en) * | 2011-03-25 | 2011-07-13 | 京信通信系统（广州）有限公司 | Time slot synchronizing and time slot power detecting methods and systems applied to global system for mobile communication (GSM) |
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| CN103036609A (en) * | 2011-10-09 | 2013-04-10 | 联芯科技有限公司 | Method and terminal for adjacent region frequency deviation soft calibration |
| CN103036609B (en) * | 2011-10-09 | 2015-08-05 | 联芯科技有限公司 | Adjacent region frequency deviation soft calibration method and terminal |
| CN103152071A (en) * | 2011-12-06 | 2013-06-12 | 福建联拓科技有限公司 | Method and equipment for searching synchronization sequence |
| CN103152071B (en) * | 2011-12-06 | 2014-12-10 | 福建联拓科技有限公司 | Method and equipment for searching synchronization sequence |
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