CN101997567B - Method and device for identifying base station identify code - Google Patents
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Abstract
The embodiment of the invention discloses a method and a device for identifying a BSIC (Base Station Identify Code). The method comprises the following steps of: receiving a GSM (Global System for Mobile Communication) signal in an idle time window; demodulating SB (Synchronous Burst) to realize identification of BSIC when the SB is searched in the received GSM signal; searching a synchronizing sequence of the SB in the GSM signal when the SB is not searched in the received GSM signal, obtaining the occurrence time of the SB of the next period according to the synchronizing sequence of the SB; and extracting the SB of the next period from the occurrence time of the next period, and demodulating the SB of the next period to realize identification of the BSIC. By adopting the embodiment of the invention, the service quality of high-speed data services can be improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of recognition methods and device of base station identity code.
Background technology
For GSM (Global System for Mobile Communications, global system for mobile communications) multimode terminal, under continuous mode, need periodically the adjacent area of all configurations to be measured according to agreement, the namely measurement between system is switched in order to realize the business of the minizone of different districts or different access technologies.In GSM, measurement between this system mainly comprises: RSSI (Received SignalStrength Indication, received signal strength indicator) identification and BSIC (Base Station IdentityCode, base station identity code) identification, the identification of RSSI is so that TD-SCDMA (TimeDivision-Synchronous Code Division Multiple Access, the code division multiple access that time-division is synchronous) terminal can measure the carrier power of GSM, and the identification of BSIC can make whether the stronger several residential quarters of TD-SCDMA terminal check power are effective GSM residential quarter.
Wherein, when carrying out BSIC identification, need terminal parses SCH (Synchronization Channel, synchronizing channel), and SB (the Synchronization Burst of carrying SCH, synchronization burst) length is 15/26us=577us, structural relation by TD-SCDMA frame and GSM frame can obtain, under the TD-SCDMA service condition, when the free time of GSM frame, window was greater than 15/26+5/13=962us, the success rate of finishing BSIC identification is 100%, when free time, window was greater than 15/26=577us and less than 962us, the success rate of finishing BSIC identification has certain probability, when free time, window was less than 577us, then can not finish BSIC identification.
On the other hand because TD-SCDMA belongs to time-division multiple address system, its free time the size of window depend on networking side scheduling, have a lot of scenes so that terminal does not have the continuous free time window can be greater than 962us.For example, terminal is being done the TD-SCDMA high speed business, HSDPA (HighSpeed Downlink Packet Access such as 2.8Mbps, high speed downlink packet access) during business or UL384kbps/DL384kbps professional, only have T0S0, DwPTS, GAP and UpPTS time slot to can be used as the free time window, but these 4 time slots are 0 o'clock at the emission lead TA of the first time slot TS1, altogether only have 950us, can't guarantee that 100% ground finishes the identification of the BSIC of network requirement.In addition, also have a lot of application scenarioss so that terminal only has a business time-slot free time, namely the time slot of a 675us between the first time slot TS1 to the six time slot TS6 at this moment, can't guarantee that also 100% finishes the BSIC identification of network requirement.
At present, the way of this class multimode terminal generally has two kinds: a kind of way is the measurement of not carrying out between system, that is, do not report the different nearby region measurement result of system or report minimum measured value; Another kind of way is only to finish RSSI identification when the measurement of carrying out between system, and does not carry out residential quarter BSIC identification.Yet, when the TD-SCDMA/GSM dual-mode terminal can't carry out the BSIC identification of GSM adjacent cell under high speed business, will cause realizing professional intersystem handover, this has affected the service quality of high-speed data service largely under current 3G network covers also incomplete situation.
Summary of the invention
In order to solve the problems of the technologies described above, the embodiment of the invention provides recognition methods and the device of a kind of BSIC, to improve the service quality of high-speed data service.
The embodiment of the invention discloses following technical scheme:
The recognition methods of a kind of base station identity code BSIC comprises: receive global system for mobile communications GSM signal at one's leisure in the window; When searching synchronization burst SB in the GSM signal that is receiving, described SB is carried out demodulation, realize the identification of BSIC; When not searching SB in the GSM signal that is receiving, in described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB; Extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is carried out demodulation, realize the identification of BSIC.
Preferably, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
Preferably, described synchronizing sequence according to SB obtains SB and at the time of occurrence of next cycle is: according to formula T=T1+51 * GSM frame period-42 * bit period, wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
The recognition methods of a kind of BSIC comprises: receive the GSM signal at one's leisure in the window; In described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB; Extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is carried out demodulation, realize the identification of BSIC.
Preferably, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
Preferably, described synchronizing sequence according to SB obtains SB and at the time of occurrence of next cycle is: according to formula T=T1+51 * GSM frame period-42 * bit period, wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
The recognition device of a kind of BSIC comprises: receiving element receives the GSM signal in the window between being used at one's leisure; The first demodulating unit is used for when when the GSM signal that receives searches SB, and described SB is carried out demodulation, realizes the identification of BSIC; SB sync-sequence search unit is used for when the GSM signal that receives does not search SB, searches for the synchronizing sequence of SB in described GSM signal, and obtains the time of occurrence of the one-period of SB according to the synchronizing sequence of described SB; The second demodulating unit is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
Preferably, described SB sync-sequence search unit comprises: slip relevant search unit is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB; Time calculating unit is used for according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
The recognition device of a kind of BSIC comprises: receiving element receives the GSM signal in the window between being used at one's leisure; SB sync-sequence search unit is used for the synchronizing sequence at described GSM signal search SB, and obtains SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB; Demodulating unit is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
Preferably, described SB sync-sequence search unit comprises: slip relevant search unit is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB; Time calculating unit is used for according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
As can be seen from the above-described embodiment, when free time window be not enough to search SB and separate timing, can further search for the synchronizing sequence of SB, utilize the periodicity of SB, synchronizing sequence according to SB calculates SB at the time of occurrence of next cycle, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
In addition, also can directly search the synchronizing sequence of SB, utilize the periodicity of SB, calculate SB at the time of occurrence of next cycle according to the synchronizing sequence of SB, then in the time of next cycle SB be extracted and demodulation, guarantee the realization of BSIC.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of an embodiment of the recognition methods of a kind of BSIC of the present invention;
Fig. 2 is the flow chart of another embodiment of the recognition methods of a kind of BSIC of the present invention;
Fig. 3 is the flow chart of another embodiment of the recognition methods of a kind of BSIC of the present invention;
Fig. 4 is the structural representation of SB in the GSM frame;
Fig. 5 is the structure chart of an embodiment of the recognition device of a kind of BCIS of the present invention;
Fig. 6 is the flow chart of another embodiment of the recognition device of a kind of BSIC of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Embodiment one
See also Fig. 1, it is the flow chart of an embodiment of the recognition methods of a kind of BSIC of the present invention, and the method may further comprise the steps:
Step 101: receive the GSM signal at one's leisure in the window;
Step 102: when searching SB in the GSM signal that is receiving, described SB is carried out demodulation, realize the identification of BSIC;
Step 103: when not searching SB in the GSM signal that is receiving, in described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Wherein, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
Need to prove, the embodiment of the invention is not limited in the GSM signal method of the synchronizing sequence of search SB, can adopt to well known to a person skilled in the art that additive method searches for the synchronizing sequence of SB yet.
Step 104: extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is carried out demodulation, realize the identification of BSIC.
As can be seen from the above-described embodiment, when free time window be not enough to search SB and separate timing, can further search for the synchronizing sequence of SB, utilize the periodicity of SB, synchronizing sequence according to SB calculates SB at the time of occurrence of next cycle, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
Embodiment two
See also Fig. 2, it is the flow chart of another embodiment of the recognition methods of a kind of BSIC of the present invention, the difference of the present embodiment and embodiment one is to directly search the synchronizing sequence of SB, and carries out the identification of BSIC according to the synchronizing sequence of SB, and then the method may further comprise the steps:
Step 201: receive the GSM signal at one's leisure in the window;
Step 202: in described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Wherein, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
Need to prove, the embodiment of the invention is not limited in the GSM signal method of the synchronizing sequence of search SB, can adopt to well known to a person skilled in the art that additive method searches for the synchronizing sequence of SB yet.
Step 203: extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is extracted and demodulation, realize the identification of BSIC.
As can be seen from the above-described embodiment, the synchronizing sequence of direct search SB utilizes the periodicity of SB, calculates SB at the time of occurrence of next cycle according to the synchronizing sequence of SB, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
Embodiment three
The below is for the scheme of embodiment one, and detailed description TD-SCDMA/GSM dual-mode terminal to the identification of BSIC, sees also Fig. 3 under high speed business, and it is the flow chart of another embodiment of a kind of BSIC recognition methods of the present invention, may further comprise the steps:
Step 301: terminal at one's leisure between window receive the GSM signal;
Step 302: terminal is searched for SB in the GSM signal that receives, and judges whether to search SB, if so, enters step 303, if not, enters step 304;
Wherein, according to the description in the background technology, for the TD-SCDMA system, free time, the size of window depended on network side scheduling, for example the scene window of lower free time at high speed business does not reach 962us, at this moment, the GSM signal that receives in the window between at one's leisure can not be finished the identification of BSIC less than SB because of search.
Step 303: terminal utilizes the free time window that SB is carried out demodulation, obtains the information bit among the SB, obtains BSIC, process ends according to the information bit among the SB;
Step 304: terminal is searched for the synchronizing sequence of SB in the GSM signal, and judges whether to search the synchronizing sequence of SB, if so, enters step 305, if not, enters step 307;
Wherein, see also Fig. 4, it is the structural representation of SB in the GSM frame.In gsm system, although the SB of GSM takies a time slot, 577us can find out according to the structure of SB in the GSM frame altogether, synchronizing sequence among the SB (Synchroniazation sequence) but only has 64bit=236.31us, and this flexible processing for terminal provides condition.Can obtain, can guarantee that the needed time window of synchronizing sequence of catching SB only is 621us, under the TD business model, obtaining this time window is easily.Therefore, search the success rate of the synchronizing sequence among the SB between at one's leisure in the window larger than the success rate that searches SB.
Wherein, can in described GSM signal, search for according to sliding correlation method the synchronizing sequence of SB.
But need to prove, the embodiment of the invention is not limited in the GSM signal method of the synchronizing sequence of search SB, can adopt to well known to a person skilled in the art that additive method searches for the synchronizing sequence of SB yet.
Step 305: terminal obtains SB at the time of occurrence of next cycle according to the synchronizing sequence of SB;
Wherein, according to the GSM standard, FCCH (Frequency Correction Channel, frequency correction channel) and SCH take 51 GSM frames as the cycle, in one-period, FCCH issues at the 0th, 10,20,30 and 40 frames respectively, and SCH issues at the 1st, 11,21,31 and 41 frames respectively, and 51 GSM frames repeat once.Therefore, when within this cycle since free time window very little and can't search SB the time, but be easy to search the synchronizing sequence of SB, when the synchronizing sequence that utilizes SB calculates the time of occurrence of SB at next cycle, just can accurately extract and demodulation SB.
Simultaneously, can learn according to GSM frame structure shown in Figure 4, in order to obtain SB at the time of occurrence T of next cycle, at first need to obtain SB in the time of current period appearance, then calculate SB at the time of occurrence of next cycle according to formula T=T1+51 * GSM frame period-42 * bit period, wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.Can obtain the synchronizing sequence of SB according to T1+51 * GSM frame period in the time of next cycle appearance, can find out according to Fig. 4, the synchronizing sequence of SB is arranged in the 45th bit of SB, therefore, whole SB will deduct 42 times that bit is shared on T1+51 * GSM frame period basis at the time of occurrence of next cycle, therefore, T=T1+51 * GSM frame period-42 * bit period.
Step 306: extract the SB of next cycle at the time of occurrence of next cycle, the SB of described next cycle is carried out demodulation, obtain the information bit among the SB, obtain BSIC, process ends according to the information bit among the SB.
Wherein, when arriving the time of occurrence of next cycle, the interim interruption may ongoing TD business accurately be extracted and demodulation SB with the window that sets apart.
Step 307: confirm the BSIC recognition failures, process ends.
As can be seen from the above-described embodiment, when free time window be not enough to search SB and separate timing, can further search for the synchronizing sequence of SB, utilize the periodicity of SB, synchronizing sequence according to SB calculates SB at the time of occurrence of next cycle, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
In addition, for the less worry of available free time window under the TD-SCDMA business, all TD and GSM Receiver Design are local vibration source independently generally speaking, that is, two local vibration sources, namely local oscillator is generally frequency mixer local oscillation signal is provided in transceiver.Because, if share a local vibration source, when the frequency switching time of local vibration source is delta, (delta is generally about 200us), then the available free time window will further reduce 2*delta, namely approximately reduce the time of 400us, this BSIC identification to the original just anxiety of free time window has more strengthened difficulty.Therefore, at present, industry generally all adopts the mode of independent local vibration source, and this is undoubtedly to have sacrificed cost and power consumption etc. as cost.In the present embodiment, only need to search for the synchronizing sequence of SB owing to realizing the identifying of BSIC, the free time window that needs is few, and then so that the shared local vibration source of TD and GSM receiver becomes possibility, reduced cost and power consumption, this has important directive significance and significant practical value to terminal and RFIC design.
Embodiment four
Corresponding with the recognition methods of above-mentioned a kind of BSIC, the embodiment of the invention also provides the recognition device of a kind of BSIC.See also Fig. 5, it is the structure chart of an embodiment of the recognition device of a kind of BSIC of the present invention, and this device comprises unit receiving element 501, the first demodulating unit 502, SB sync-sequence search unit 503 and the second demodulating unit 504.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Receiving element 501 receives the GSM signal in the window between being used at one's leisure;
The first demodulating unit 502 is used for when when the GSM signal that receives searches SB, and described SB is carried out demodulation, realizes the identification of BSIC;
SB sync-sequence search unit 503 is used for when the GSM signal that receives does not search SB, searches for the synchronizing sequence of SB in described GSM signal, and obtains the time of occurrence of the one-period of SB according to the synchronizing sequence of described SB;
The second demodulating unit 504 is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
Wherein, SB sync-sequence search unit 503 comprises: slip relevant search unit 5031 and time calculating unit 5032,
Slip relevant search unit 5031 is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB;
Time calculating unit 5032 is used for according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
As can be seen from the above-described embodiment, when free time window be not enough to search SB and separate timing, can further search for the synchronizing sequence of SB, utilize the periodicity of SB, synchronizing sequence according to SB calculates SB at the time of occurrence of next cycle, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
Embodiment five
The embodiment of the invention also provides the recognition device of a kind of BSIC.See also Fig. 6, it is the structure chart of another embodiment of the recognition device of a kind of BSIC of the present invention, and the difference of the present embodiment and embodiment four is to directly search the synchronizing sequence of SB, and carries out the identification of BSIC according to the synchronizing sequence of SB.This device comprises receiving element 601, SB sync-sequence search unit 602 and demodulating unit 603.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Receiving element 601 receives the GSM signal in the window between being used at one's leisure;
SB sync-sequence search unit 602 is used for the synchronizing sequence at described GSM signal search SB, and obtains SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Demodulating unit 603 is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
Wherein, SB sync-sequence search unit 602 comprises: slip relevant search unit 6021 and time calculating unit 6022,
Slip relevant search unit 6021 is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB;
Time calculating unit 6022 is used for according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
As can be seen from the above-described embodiment, the synchronizing sequence of direct search SB utilizes the periodicity of SB, calculates SB at the time of occurrence of next cycle according to the synchronizing sequence of SB, then in the time of next cycle SB is extracted and demodulation, guarantee the realization of BSIC.
Need to prove, one of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random AccessMemory, RAM) etc.
Above recognition methods and device to a kind of BSIC provided by the present invention is described in detail, used specific embodiment herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the recognition methods of a base station identity code BSIC is characterized in that, comprising:
Receive global system for mobile communications GSM signal at one's leisure in the window;
When searching synchronization burst SB in the GSM signal that is receiving, described SB is carried out demodulation, realize the identification of BSIC;
When not searching SB in the GSM signal that is receiving, in described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is carried out demodulation, realize the identification of BSIC.
2. method according to claim 1 is characterized in that, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
3. method according to claim 1 is characterized in that, described synchronizing sequence according to SB obtains SB and at the time of occurrence of next cycle is:
Calculate SB at the time of occurrence of next cycle according to formula T=T1+51 * GSM frame period-42 * bit period, wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
4. the recognition methods of a BSIC is characterized in that, comprising:
Receive the GSM signal at one's leisure in the window;
In described GSM signal, search for the synchronizing sequence of SB, and obtain SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Extract the SB of next cycle at the time of occurrence of described next cycle, the SB of described next cycle is carried out demodulation, realize the identification of BSIC.
5. method according to claim 4 is characterized in that, the described synchronizing sequence of searching for SB in the GSM signal comprises: the synchronizing sequence of searching for SB according to sliding correlation method in described GSM signal.
6. method according to claim 4 is characterized in that, described synchronizing sequence according to SB obtains SB and at the time of occurrence of next cycle is:
Calculate SB at the time of occurrence of next cycle according to formula T=T1+51 * GSM frame period-42 * bit period, wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
7. the recognition device of a BSIC is characterized in that, comprising:
Receiving element receives the GSM signal in the window between being used at one's leisure;
The first demodulating unit is used for when when the GSM signal that receives searches SB, and described SB is carried out demodulation, realizes the identification of BSIC;
SB sync-sequence search unit is used for when the GSM signal that receives does not search SB, searches for the synchronizing sequence of SB in described GSM signal, and obtains SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
The second demodulating unit is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
8. device according to claim 7 is characterized in that, described SB sync-sequence search unit comprises:
Slip relevant search unit is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB;
Time calculating unit is used for calculating SB at the time of occurrence of next cycle according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
9. the recognition device of a BSIC is characterized in that, comprising:
Receiving element receives the GSM signal in the window between being used at one's leisure;
SB sync-sequence search unit is used for the synchronizing sequence at described GSM signal search SB, and obtains SB at the time of occurrence of next cycle according to the synchronizing sequence of described SB;
Demodulating unit is used for extracting at the time of occurrence of described next cycle the SB of next cycle, and the SB of described next cycle is carried out demodulation, realizes the identification of BSIC.
10. device according to claim 9 is characterized in that, described SB sync-sequence search unit comprises:
Slip relevant search unit is used for according to the synchronizing sequence of sliding correlation method at described GSM signal search SB;
Time calculating unit is used for calculating SB at the time of occurrence of next cycle according to formula T=T1+51 * GSM frame period-42 * bit period, and wherein, T1 is the time of occurrence of the synchronizing sequence original position of SB, and T is that SB is at the time of occurrence of next cycle.
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| CN101997567A (en) | 2011-03-30 |
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