CN101534150B - Multiframe synchronization method for cell searching in TD-SCDMA system - Google Patents

Multiframe synchronization method for cell searching in TD-SCDMA system Download PDF

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CN101534150B
CN101534150B CN200810065858A CN200810065858A CN101534150B CN 101534150 B CN101534150 B CN 101534150B CN 200810065858 A CN200810065858 A CN 200810065858A CN 200810065858 A CN200810065858 A CN 200810065858A CN 101534150 B CN101534150 B CN 101534150B
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synchronization
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CN101534150A (en
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张道垠
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Abstract

The invention discloses a multiframe synchronization method for cell searching in a TD-SCDMA system, comprising the following steps of: a. determining position information of successful synchronization of retained phase sequence and phase; b. synchronizing the phase and retained phase sequence of current 8 continuous subframes, entering step c if the synchronization fails, and entering step d if the synchronization succeeds; c. updating the times of synchronization failure and judging whether the times of synchronization failure reaches the threshold of the times of synchronization failure, if so, updating the phase of the 8 continuous subframes and returning to step a, and if not, updating the phase of the 8 continuous subframes and returning to step b; and d. updating the times of successful synchronization and judging whether the times for successful synchronization reaches the threshold of the times of successful synchronization, if so, considering that the system realizes multiframe synchronization and reporting the information of successful multiframe synchronization, and if not, considering that the system does not realize multiframe synchronization and updating the phase of the 8 continuous subframes and returning to step b. The method reinforces the stability of multiframe synchronization.

Description

The multiframe synchronization method of Cell searching in a kind of TD-SCDMA system
Technical field
The present invention relates to wireless communication field, the multiframe synchronization method of Cell searching in especially a kind of TD-SCDMA (TimeDivision-Synchronous Code Division Multiple Access, TD SDMA inserts) system.
Background technology
In the TD-SCDMA system, the position of BCH (Broadcast Channel, broadcast channel) place frame is provided by the relative phase sequence of midamble intersymbol among SYNC-DL (downlink synchronous sequence) and the TS0 (time slot 0).The phase place that UE (User Equipment, subscriber equipment) obtains a plurality of subframes continuously is the synchronous key of control multi-frame.The phase sequence of the SYNC-DL that possibly occur in the general multi-frame has two kinds of S1 and S2, when S1 occurring, shows that next multi-frame begins to have BCH information, and when S2 occurring, next multi-frame begins not send BCH.Wherein, S1 is (135,45,225,135) degree, and S2 is (315,225,315,45) degree.
The multiframe synchronization method of Cell searching is one of important topic of TD-SCDMA system design.At application number is " 200410089030.0 ", and name is called in the one Chinese patent application of " method of obtaining broadcast information position in a kind of time division duplex mobile communication system " and discloses a kind of multiframe synchronization method.This patent if correlation satisfies the requirement of thresholding, just thinks that multi-frame is upward synchronous to the correlation of a phase place of each subframe judgement.Since just carry out the comparison of single, the less stable that multi-frame is synchronous, and the multi-frame of the Cell searching that can't efficiently realize is synchronous.
Summary of the invention
The technical problem that the present invention will solve provides the multiframe synchronization method of Cell searching in a kind of TD-SCDMA system, has strengthened the synchronous stability of multi-frame.
The technical solution adopted for the present invention to solve the technical problems is:
The multiframe synchronization method of Cell searching in a kind of TD-SCDMA system may further comprise the steps:
A, definite phase sequence and Phase synchronization successful positions information of keeping;
B, the phase place and the said reservation phase sequence of 8 current continuous subframes carried out synchronously, during synchronization failure, get into step c, otherwise, steps d got into;
The number of times of c, renewal synchronization failure, and judge whether the number of times of synchronization failure reaches preset synchronization failure number of times thresholding, if, upgrade the phase place of said 8 continuous subframes and get back to step a, otherwise, upgrade the phase place of said 8 continuous subframes and get back to step b;
D, renewal be successful number of times synchronously, and judges whether successful number of times reaches preset synchronous number of success thresholding synchronously, if think that then said system has realized that multi-frame is synchronous, reports the synchronous successful information of multi-frame; Otherwise, think that the said system multi-frame of also being unrealized is synchronous, upgrade the phase place of said 8 continuous subframes and get back to step b.
In the such scheme, said step a may further comprise the steps:
A1, the phase place and the S1 of 8 current continuous subframes carried out Phase synchronization, if the Phase synchronization success, then with said S1 as said reservation phase sequence, keep Phase synchronization successful positions information, upgrade said synchronous successful number of times and get into said step b; Otherwise, get into next step;
A2, the phase place and the S2 of 8 current continuous subframes carried out Phase synchronization, if the Phase synchronization success, then with said S2 as said reservation phase sequence, keep Phase synchronization successful positions information, upgrade said synchronous successful number of times and get into said step b; Otherwise, get into next step;
The phase place of a3, said 8 continuous subframes of renewal is also got back to step a1.
In the such scheme; Update method to the phase place of 8 continuous subframes is following: the phase place that keeps back 4 continuous subframes of said 8 continuous subframes; Read simultaneously the phase place of 4 continuous subframes again, the phase place with said back 4 continuous subframes reaches the phase place of the phase place of 4 continuous subframes that read again as 8 continuous subframes after upgrading successively.
In the such scheme, among the said step b, the phase place of said current 8 continuous subframes and said reservation phase sequence carry out when synchronous; If Phase synchronization success and Phase synchronization successful positions are consistent with said Phase synchronization successful positions information; Then success synchronously, otherwise, synchronization failure.
In the such scheme, the phase place of 8 current continuous subframes and said S1 or S2 are carried out phase locked method may further comprise the steps:
(1), the 1st phase place to the 4th sub-frame of said 8 continuous subframes compared with said S1 or S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively; Otherwise, get into next step;
(2), the 2nd phase place to the 5th sub-frame of said 8 continuous subframes compared with said S1 or S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively, otherwise, next step got into;
(3), the 3rd phase place to the 6th sub-frame of said 8 continuous subframes compared with said S1 or S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively, otherwise, next step got into;
(4), the 4th phase place to the 7th sub-frame of said 8 continuous subframes compared with said S1 or S2 successively,, then think the Phase synchronization success if both are identical successively, otherwise, think the Phase synchronization failure.
In the such scheme, said S1 is (135,45,225,135), and said S2 is (315,225,315,45).
In the such scheme, when carrying out for the first time said step a1, the phase place of 8 current continuous subframes reads continuously and obtains.
In the such scheme, in the multi-frame synchronizing process, will keep watch on, and in case the synchronous time of multi-frame reaches preset time gate limit value, then finish the synchronous flow process of multi-frame, and report multi-frame synchronization failure information the synchronous time of multi-frame.
In the such scheme; The phase place of each sub-frame that reads in the multi-frame synchronizing process is to calculate and report according to the synchronous configuration information of multi-frame, and said configuration information comprises positional information, downlink synchronous sequence, the midamble sign indicating number of downlink synchronous sequence and reports the number of sub frames of phase place at every turn.
In the such scheme, the computational methods of said subframe phase place specifically may further comprise the steps:
I, the midamble sign indicating number of 128 chips that reads midamble sign indicating number and the time slot 0 of 128 chips according to said configuration information receive data, are designated as M and m respectively;
II, calculate the phase delta m of midamble sign indicating number according to M and m, wherein, Δ m = Σ i = 0 127 m · M * ;
III, the downlink synchronous sequence that reads downlink synchronous sequence and 64 chips of 64 chips according to said configuration information receive data, are designated as S and s respectively;
IV, calculate the phase delta s of downlink synchronous sequence according to S and s, wherein, Δ s = Σ i = 0 63 s · S * ;
V, calculate the phase place D of said subframe according to Δ m and Δ s, wherein, D=Δ s Δ m *
Beneficial effect of the present invention mainly shows: it is synchronous that technical scheme provided by the invention is carried out repeatedly iteration with the phase place of continuous subframes and respective phase sequence, thereby strengthened the synchronous stability of multi-frame, improved the multi-frame synchronization efficiency; Simultaneously, it is carried out flexible configuration, under the prerequisite of requirement of real time, improved the efficient of system according to the situation of hardware resource.
Description of drawings
Fig. 1 is the synchronous flow chart of multi-frame of Cell searching in the TD-SCDMA of the present invention system;
Fig. 2 carries out phase locked flow chart for the phase place of 8 continuous subframes of the present invention and S1 or S2;
Fig. 3 carries out phase locked sketch map for the phase place and the S1 of 8 continuous subframes of the present invention;
Fig. 4 carries out phase locked sketch map for the phase place and the S2 of 8 continuous subframes of the present invention;
Fig. 5 is the calculation flow chart of each subframe phase place of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further description.
With reference to Fig. 1, the multiframe synchronization method of Cell searching in a kind of TD-SCDMA system may further comprise the steps:
S101: initialization multi-frame synchro timer, and synchronous successful counter count_v and synchronization failure counter count_d be changed to 0;
S102: the phase place that reads 8 continuous subframes;
S103: the phase place and the S1 (135,45,225,135) of 8 current continuous subframes are carried out Phase synchronization, if the Phase synchronization success gets into S104, otherwise, get into S105;
S104: S1 as keeping phase sequence, is kept Phase synchronization successful positions information simultaneously, and synchronous successful counter count_v is changed to 1, and upgrades the phase place of said 8 continuous subframes, gets into S108 afterwards;
S105: the phase place and the S2 (315,225,315,45) of 8 current continuous subframes are carried out Phase synchronization, if the Phase synchronization success gets into S106; Otherwise, get into S107;
S106: the S2 row as keeping phase sequence, are kept Phase synchronization successful positions information simultaneously, and synchronous successful counter count_v is changed to 1, and upgrades the phase place of said 8 continuous subframes, gets into S108 afterwards;
S107: upgrade the phase place of said 8 continuous subframes and get back to S103;
S108: the phase place and the reservation phase sequence of 8 current continuous subframes are carried out synchronously, during synchronization failure, get into S109, otherwise, get into S112;
S109: whether then to judge the multi-frame synchro timer, if get into S110; Otherwise, get into S111;
S110: report position, Kongxiang and process ends;
S111: synchronization failure counter count_d increases progressively 1, and judges whether synchronization failure counter count_d reaches preset synchronization failure number of times thresholding, if, get into S107, otherwise, S114 got into;
S112-S113: synchronous successful counter count_v increases progressively 1; And judge whether successful number of times reaches preset synchronous number of success thresholding synchronously; If; Think that then system has realized that multi-frame is synchronous, report synchronous phase place of multi-frame and positional information, stop multi-frame synchro timer and process ends; Otherwise, think that system's multi-frame of also being unrealized is synchronous, get into S114;
S114: upgrade the phase place of said 8 continuous subframes and get back to S108.
In the above-mentioned flow process; Update method to the phase place of 8 continuous subframes is following: the phase place that keeps back 4 continuous subframes of said 8 continuous subframes; Read simultaneously the phase place of 4 continuous subframes again, the phase place with said back 4 continuous subframes reaches the phase place of the phase place of 4 continuous subframes that read again as 8 continuous subframes after upgrading successively.That is to say that preceding 8 sub-frame that will read for the 1st time are carried out synchronously; To read for the 2nd time the 5th carries out synchronously to the 12nd sub-frame; To read for the 3rd time the 9th to carry out multi-frame to the 16th sub-frame synchronous; It is synchronous that the 13rd of will read of the 4th carries out multi-frame to the 20th sub-frame; Carry out successively.
With reference to Fig. 2, at every turn with the phase place and the S1 of 8 current continuous subframes, when S2 carries out Phase synchronization, may further comprise the steps:
S201: the 1st phase place to the 4th sub-frame of said 8 continuous subframes compared with S1, S2 successively,, then think and finish the Phase synchronization success originally subsynchronous if both are identical successively; Otherwise, get into next step;
S202: the 2nd phase place to the 5th sub-frame of said 8 continuous subframes compared with S1, S2 successively, if both are identical successively, think that then Phase synchronization is successful, end is originally subsynchronous, otherwise, get into next step;
S203: the 3rd phase place to the 6th sub-frame of said 8 continuous subframes compared with S1, S2 successively, if both are identical successively, think that then Phase synchronization is successful, end is originally subsynchronous, otherwise, get into next step;
S204: the 4th phase place to the 7th sub-frame of said 8 continuous subframes compared with S1, S2 successively,, then think the Phase synchronization success if both are identical successively, otherwise, think the Phase synchronization failure.
Phase place on the Phase synchronization of 8 continuous subframes shown in Figure 3 is S1, and the Phase synchronization successful positions is 3, and wherein, the vertical line lattice are represented 135 degree phase places, and the horizontal line lattice are represented 45 degree phase places, and the some lattice are represented 225 degree phase places; Phase place on the Phase synchronization of 8 continuous subframes shown in Figure 4 is S2, and the Phase synchronization successful positions is 2, and wherein, the oblique line lattice are represented 315 degree phase places, and the horizontal line lattice are represented 45 degree phase places, and the some lattice are represented 225 degree phase places.
The phase place of each sub-frame that reads in the synchronous flow process of multi-frame is to calculate and report according to the synchronous configuration information of multi-frame; Wherein, configuration information comprises that positional information, downlink synchronous sequence, the midamble sign indicating number of downlink synchronous sequence reach the number of sub frames that at every turn reports phase place.The computational methods of each subframe phase place are as shown in Figure 5, may further comprise the steps:
S501: the midamble sign indicating number of 128 chips that reads midamble sign indicating number and the TS0 of 128 chips according to configuration information receives data, is designated as M and m respectively;
S502: according to the phase delta m of M and m calculating midamble sign indicating number, wherein, Δ m = Σ i = 0 127 m · M * ;
S503: the downlink synchronous sequence that reads downlink synchronous sequence and 64 chips of 64 chips according to configuration information receives data, is designated as S and s respectively;
S504: according to the phase delta s of S and s calculating downlink synchronous sequence, wherein, Δ s = Σ i = 0 63 s · S * ;
S505: calculate the phase place D of said subframe according to Δ m and Δ s, wherein, D=Δ s Δ m *
When the experiment proof reported the number of sub frames of phase place to be 4 at every turn, the performance of system was optimum.Therefore, in practical operation, report storage once according to the phase place of every calculating 4 sub-frame of flow process shown in Figure 5.When carrying out the synchronous flow process of multi-frame, read corresponding subframe continuously and get final product.
The above is merely embodiments of the invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (10)

1. the multiframe synchronization method of Cell searching in the TD-SCDMA system is characterized in that, may further comprise the steps:
A, definite phase sequence and Phase synchronization successful positions information of keeping;
B, the phase place and the said reservation phase sequence of 8 current continuous subframes carried out synchronously, during synchronization failure, get into step c, otherwise, steps d got into;
The number of times of c, renewal synchronization failure, and judge whether the number of times of synchronization failure reaches preset synchronization failure number of times thresholding, if, upgrade the phase place of said 8 continuous subframes and get back to step a, otherwise, upgrade the phase place of said 8 continuous subframes and get back to step b;
D, renewal be successful number of times synchronously, and judges whether successful number of times reaches preset synchronous number of success thresholding synchronously, if think that then said system has realized that multi-frame is synchronous, reports the synchronous successful information of multi-frame; Otherwise, think that the said system multi-frame of also being unrealized is synchronous, upgrade the phase place of said 8 continuous subframes and get back to step b.
2. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 1 system is characterized in that said step a may further comprise the steps:
A1, the phase place and the phase sequence S1 of 8 current continuous subframes carried out Phase synchronization; If Phase synchronization success; Then with said phase sequence S1 as said reservation phase sequence, keep Phase synchronization successful positions information, upgrade said synchronous successful number of times and get into said step b; Otherwise, get into next step;
A2, the phase place and the phase sequence S2 of 8 current continuous subframes carried out Phase synchronization; If Phase synchronization success; Then with said phase sequence S2 as said reservation phase sequence, keep Phase synchronization successful positions information, upgrade said synchronous successful number of times and get into said step b; Otherwise, get into next step;
The phase place of a3, said 8 continuous subframes of renewal is also got back to step a1.
3. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 2 system; It is characterized in that; Update method to the phase place of 8 continuous subframes is following: the phase place that keeps back 4 continuous subframes of said 8 continuous subframes; Read simultaneously the phase place of 4 continuous subframes again, the phase place with said back 4 continuous subframes reaches the phase place of the phase place of 4 continuous subframes that read again as 8 continuous subframes after upgrading successively.
4. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 3 system; It is characterized in that: among the said step b; The phase place of said current 8 continuous subframes and said reservation phase sequence carry out when synchronous, and be if Phase synchronization success and Phase synchronization successful positions are consistent with said Phase synchronization successful positions information, then successfully synchronous; Otherwise, synchronization failure.
5. the multiframe synchronization method of Cell searching is characterized in that in the TD-SCDMA as claimed in claim 4 system, the phase place of 8 current continuous subframes and said phase sequence S1 or phase sequence S2 is carried out phase locked method may further comprise the steps:
(1), the 1st phase place to the 4th sub-frame of said 8 continuous subframes compared with said phase sequence S1 or phase sequence S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively; Otherwise, get into next step;
(2), the 2nd phase place to the 5th sub-frame of said 8 continuous subframes compared with said phase sequence S1 or phase sequence S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively, otherwise, next step got into;
(3), the 3rd phase place to the 6th sub-frame of said 8 continuous subframes compared with said phase sequence S1 or phase sequence S2 successively,, then think the Phase synchronization success, finish that this is subsynchronous if both are identical successively, otherwise, next step got into;
(4), the 4th phase place to the 7th sub-frame of said 8 continuous subframes compared with said phase sequence S1 or phase sequence S2 successively,, then think the Phase synchronization success if both are identical successively, otherwise, think the Phase synchronization failure.
6. like the multiframe synchronization method of Cell searching in one of them described TD-SCDMA system of claim 2 to 5, it is characterized in that: said phase sequence S1 is (135,45,225,135) degree, and said phase sequence S2 be that (315,225,315,45) are spent.
7. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 6 system is characterized in that: when carrying out for the first time said step a1, the phase place of 8 current continuous subframes reads continuously and obtains.
8. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 7 system; It is characterized in that: in the multi-frame synchronizing process; To keep watch on the synchronous time of multi-frame; In case the synchronous time of multi-frame reaches preset time gate limit value, then finish the synchronous flow process of multi-frame, and report multi-frame synchronization failure information.
9. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 1 system; It is characterized in that: the phase place of each sub-frame that reads in the multi-frame synchronizing process is to calculate and report according to the synchronous configuration information of multi-frame, and said configuration information comprises positional information, downlink synchronous sequence, the midamble sign indicating number of downlink synchronous sequence and reports the number of sub frames of phase place at every turn.
10. the multiframe synchronization method of Cell searching in the TD-SCDMA as claimed in claim 9 system is characterized in that the computational methods of said subframe phase place specifically may further comprise the steps:
I, the midamble sign indicating number of 128 chips that reads midamble sign indicating number and the time slot 0 of 128 chips according to said configuration information receive data, are designated as M and m respectively;
II, calculate the phase delta m of midamble sign indicating number according to M and m; Wherein,
Figure FSB00000839623600031
III, the downlink synchronous sequence that reads downlink synchronous sequence and 64 chips of 64 chips according to said configuration information receive data, are designated as S and s respectively;
IV, calculate the phase delta s of downlink synchronous sequence according to S and s; Wherein,
Figure FSB00000839623600032
V, calculate the phase place D of said subframe according to Δ m and Δ s, wherein, D=Δ s Δ m *
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CN102036362B (en) * 2009-09-25 2013-08-07 中兴通讯股份有限公司 Method and device for acquiring multi-frame synchronization
CN104125053B (en) * 2014-08-12 2017-06-16 电子科技大学中山学院 Method and device for capturing synchronous frame
CN105634542B (en) * 2016-03-04 2018-11-06 广州慧睿思通信息科技有限公司 A kind of TD-SCDMA multi-cell searchs method

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CN1953609A (en) * 2006-11-16 2007-04-25 重庆重邮信科股份有限公司 Accurate access method in the case of the initial search at the cell in TD-SCDMA system
CN101047438A (en) * 2007-03-27 2007-10-03 中兴通讯股份有限公司 Method for transceiving MBMS data using reframe in TD-SCDMA

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1953609A (en) * 2006-11-16 2007-04-25 重庆重邮信科股份有限公司 Accurate access method in the case of the initial search at the cell in TD-SCDMA system
CN101047438A (en) * 2007-03-27 2007-10-03 中兴通讯股份有限公司 Method for transceiving MBMS data using reframe in TD-SCDMA

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