CN103856992A

CN103856992A - Mobile terminal and synchronous tracking method and device

Info

Publication number: CN103856992A
Application number: CN201210507697.2A
Authority: CN
Inventors: 周英楠; 张马
Original assignee: Spreadtrum Communications Tianjin Co Ltd
Current assignee: Spreadtrum Communications Tianjin Co Ltd
Priority date: 2012-11-30
Filing date: 2012-11-30
Publication date: 2014-06-11
Anticipated expiration: 2032-11-30
Also published as: CN103856992B

Abstract

The invention discloses a synchronous tracking method of a mobile terminal and a device thereof. A first terminal card resides in a first network, and a second terminal card resides in a second network. The synchronous tracking method of the mobile terminal contains the following steps: a cell information table group of the second network is established, wherein the cell information table group is composed of a serving cell information table and M adjacent cell information tables; at least based on a synchronous result or channel estimation result of the mobile terminal, the cell information table group is updated; and based on the updated serving cell information table, the position of a target frame of the second network is determined, and with synchronization information of the first terminal card as the reference, the target frame of the second network is received and decoded so as to maintain synchronous tracking of the second terminal card. By the technical scheme, the problem of maintaining synchronous tracking of the second terminal card with the first terminal card as the reference is solved; and with the introduction of the cell information table group and extended frame numbers, the process of synchronous tracking is much faster, and efficiency of a system is raised.

Description

Mobile terminal and method for synchronized thereof and device

Technical field

The present invention relates to mobile communication technology field, particularly a kind of mobile terminal and method for synchronized thereof and device.

Background technology

No.3 generation mobile communication system is with its more efficient spectrum efficiency, and higher service quality and security performance and higher service rate, obtaining more and more users' concern and use.But the network coverage face of second generation mobile communcations system is wider, communication effect is stable, still has its unique advantage.Therefore, one can be supported No.3 generation mobile communication system, can support again the multi-mold multi-card multi-standby mobile terminal of second generation mobile communcations system to arise at the historic moment.Take existing a kind of dual-mode dual-card dual-standby mobile terminal as example, it is mainly to support TD SDMA (TD-SCDMA, Time Division-SynchronousCode Division Multiple Access) and global system for mobile communications (GSM, Global System forMobile Communications) mobile terminal of two kinds of networks, in a mobile terminal, can put into a TD-SCDMA terminal card and a GSM terminal card simultaneously, and standby simultaneously in TD-CDMA network and GSM network respectively.

In single base band injection frequency implementation, when TD-SCDMA terminal card standby wherein or when carrying out business, GSM terminal card need to be take the synchronizing information of TD-SCDMA terminal card as benchmark and the base station synchronization of GSM network, further to Broadcast Control Channel (BCCH, Broadcast ControlChannel) or paging channel (PCH, Paging Channel) etc. information receive, decode, to guarantee the normal standby of GSM terminal card or to carry out business.Therefore, GSM terminal card, if the synchronizing information of TD-SCDMA terminal card is how that benchmark keeps and the tracking of synchronizeing of GSM network base station, is prerequisite and the necessary condition that guarantees the normal use of GSM terminal card.But existing technology has only solved the problem of the initial synchronisation of dual-SIM-card dual-standby mobile terminal, do not consider the synchronous problem of following the tracks of of follow-up two terminal cards.The patent that is for example US2010222064A1 with reference to U.S. Patent Publication No., a kind of TD-SCDMA/GSM dual-mode dual-card dual-standby mobile phone is disclosed, at GSM terminal card under holding state, TD-SCDMA terminal card, if the synchronizing information of GSM terminal card is how that benchmark completes the problem of carrying out initial synchronisation in the base station of TD-SCDMA network, but still does not solve the problems of the technologies described above.

Summary of the invention

The problem that technical solution of the present invention will solve is, in multi-card mobile terminal, in the time of described first terminal card standby, described the second terminal card as the synchronizing information of first terminal card as described in be how that benchmark keeps the tracking of synchronizeing between second network base station.

For addressing the above problem, technical solution of the present invention provides a kind of method for synchronized of mobile terminal, comprising:

Set up the cell information table group of second network, described cell information table group is made up of a service cell information table and M information of adjacent cells table, the number of the adjacent cell that wherein M is described Serving cell;

At least synchronized result based on described mobile terminal or channel estimation results, upgrade described cell information table group, wherein, described synchronous or described the second terminal card that synchronously comprises described first terminal card synchronous, described channel estimating comprises the channel estimating of described first terminal card or the channel estimating of described the second terminal card;

Service cell information table based on described renewal, determines the position of the target frame of described second network, and take the synchronizing information of described first terminal card as benchmark receives, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Optionally, described cell information table comprises the BSIC of the community of second network, the frequency point number of the community of second network, the frame number of the initial frame of first network, the frame number of the initial frame of second network and the initial frame of described second network are with respect to the skew of the initial frame of described first network, wherein, the initial frame of described first network refers to the frame of the first network at first terminal card place described in the initial synchronisation moment, the initial frame of described second network refers to the frame of the second network at the second terminal card place described in the initial synchronisation moment, the moment of the described initial synchronisation moment, to be described the second terminal card be synchronized to take the synchronizing information of described first terminal card as the benchmark base station of described second network.

Optionally, the described synchronized result based on described the second terminal card, upgrades described cell information table group, comprising:

Initial synchronisation result based on described the second terminal card or based on described the second terminal card community switch after synchronized result, upgrade described cell information table group.

Optionally, the described initial synchronisation result based on described the second terminal card, upgrades described cell information table group, comprising:

By the initial synchronisation moment, the BSIC of the Serving cell that the synchronizing channel of the described second network of decoding and Broadcast Control Channel obtain an and M adjacent cell and frequency point number are recorded as BSIC and the frequency point number in described service cell information table and described M information of adjacent cells table;

By the initial synchronisation moment, the frame number of the frame of described first network is recorded as the frame number of the initial frame of the described first network in described service cell information table and described M information of adjacent cells table;

By the initial synchronisation moment, the frame of the frame number of the frame of the Serving cell of described second network, the Serving cell of described second network is recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described service cell information table, described second network with respect to the skew of the initial frame of described first network with respect to the skew of the frame of described first network;

By the initial synchronisation moment, the frame of the adjacent cell of the frame number of the frame of the adjacent cell of the Serving cell of described second network, the Serving cell of described second network is recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described information of adjacent cells table, described second network with respect to the skew of the initial frame of described first network with respect to the skew of the frame of described first network.

Optionally, described based on described the second terminal card community switch after synchronized result, upgrade described cell information table group, comprising:

After switch described the second terminal card community, by decoding, the synchronizing channel of described second network and the BSIC of the Serving cell that Broadcast Control Channel obtains and frequency point number are recorded as BSIC and the frequency point number in described service cell information table;

Take the BSIC in described service cell information table and frequency point number as index, the information of adjacent cells table of search coupling in described M information of adjacent cells table;

Call the skew with respect to the initial frame of described first network of the frame number of initial frame of the frame number of the initial frame of the described first network in the information of adjacent cells table of described coupling, described second network and the initial frame of described second network, and be recorded as respectively the skew with respect to the initial frame of described first network of the frame number of initial frame of the frame number of the initial frame of the described first network in described service cell information table, described second network and the initial frame of described second network;

BSIC and the frequency point number of the M of the Serving cell after the switching that described in carrying recorded decoding, the synchronizing channel of second network and Broadcast Control Channel an obtain adjacent cell;

Take the BSIC of M adjacent cell of the Serving cell after described switching and frequency point number as index, described M information of adjacent cells table upgraded.

Optionally, the BSIC of the M of described Serving cell after a described switching adjacent cell and frequency point number are index, and described M information of adjacent cells table upgraded, and comprising:

Take the BSIC of M adjacent cell of the Serving cell after described switching and frequency point number as index, search for described M information of adjacent cells table;

When BSIC and frequency point number are not mated, the BSIC of the adjacent cell of the Serving cell after described switching and frequency point number are recorded as to BSIC and the frequency point number in described information of adjacent cells table, by the initial synchronisation moment, the frame number of the frame of the adjacent cell of the Serving cell after described switching, the frame of the adjacent cell of the Serving cell after described switching is recorded as respectively the frame number of the initial frame of the described second network in described information of adjacent cells table with respect to the skew of the frame of described first network, the initial frame of described second network is with respect to the skew of the initial frame of described first network, the frame number of the frame of first network described in the initial synchronisation moment is recorded as to the frame number of the initial frame of the described first network in described information of adjacent cells table.

Optionally, the described channel estimation results based on described the second terminal card, upgrades described cell information table group, comprising:

In the time that described the second terminal card carries out BSIC confirmation, the training sequence of synchronizing channel is carried out to channel estimating, obtain the primary importance deviation of the frame of described second network;

In the time that described the second terminal card receives four frame data of broadcast channel or paging channel, every frame data are carried out to channel estimating, if described broadcast channel or paging channel decode results are correct, the results averaged of the channel estimating of four frame data to described broadcast channel or paging channel, obtains the second place deviation of the frame of described second network;

At least, based on described primary importance deviation or described second place deviation, upgrade respectively the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network.

Optionally, the described synchronized result based on described first terminal card, upgrades described cell information table group, comprising:

In the time that described first terminal card is synchronously adjusted, if after decoding broadcast channel the frame number of the frame of described first network have adjust and adjustment amount be the first frame number deviation,, based on described the first frame number deviation, upgrade the frame number of the initial frame of the described first network in described service cell information table and M information of adjacent cells table;

In the time that described first terminal card is synchronously adjusted, if it is the 3rd position deviation that there are adjustment and adjustment amount in the position of the frame of described first network, upgrade the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network based on described the 3rd position deviation.

Optionally, the described channel estimation results based on described first terminal card, upgrades described cell information table group, comprising:

In the time that data are received in described first terminal clamping, the training sequence of each conventional time slot is carried out to channel estimating, the adjustment amount that obtains the position of the frame of described first network is the 4th position deviation;

Based on described the 4th position deviation, upgrade the initial frame of the described second network in a described service cell information table and described M information of adjacent cells table with respect to the skew of the initial frame of described first network.

Optionally, the described service cell information table based on described renewal, determines the position of the target frame of described second network, and take the synchronizing information of described first terminal card as benchmark receives, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card, comprising:

The frame number of the frame to described first network is expanded counting, and be recorded as expansion frame number, the count frequency of described expansion frame number is consistent with the count frequency of frame number, the scope of described expansion frame number be frame number scope N doubly, N is more than or equal to 2, and in the time that described first network switches, described expansion frame number will be counted again;

The frame number of the expansion frame number of the initial frame of the expansion frame number of the present frame based on first network, described first network and the initial frame of described second network, determines the frame number of the present frame of second network;

The frame number of the present frame based on described second network, determines the frame number of the target frame of second network;

The initial frame of the expansion frame number of the initial frame based on described first network, described second network is with respect to the frame number of the skew of the initial frame of described first network and the target frame of second network, determines the skew with respect to the target frame of described first network of the expansion frame number of target frame of first network and the target frame of described second network;

Take the synchronizing information of described first terminal card as benchmark, receive the target frame of described second network;

Take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Optionally, the expansion frame number of the expansion frame number of the described present frame based on first network and the initial frame of described first network, determine and comprise the frame number of the present frame of second network:

Calculate the present frame of first network and the expansion frame number difference of initial frame;

According to the frame length proportionate relationship of first network and second network and described expansion frame number difference, calculate the present frame of second network and the first frame number difference of initial frame;

The frame number of the initial frame based on described the first frame number difference and second network, determines the frame number of the present frame of second network.

Optionally, the frame number of the described present frame based on described second network, determine that the frame number of the target frame of second network comprises:

Obtain the target frame of second network and the second frame number difference of present frame;

The frame number of the present frame based on described second network and described the second frame number difference are determined the frame number of the target frame of second network.

Optionally, described second network is GSM network, described in obtain the target frame of second network and the second frame number difference of present frame comprises the steps:

The target frame of obtaining described second network in GSM51 multi-frame corresponding first-phase to frame number;

The present frame that calculates described second network in GSM51 multi-frame corresponding second-phase to frame number;

Calculate described first-phase to frame number and second-phase the difference to frame number, to obtain described the second frame number difference.

Optionally, the expansion frame number of the target frame of described first network and the target frame of described second network are as follows with respect to the computing formula of the skew of the target frame of described first network:

T3=T1 ₁’+floor（（TD_len*12*Delta_GSM_sfn/13+offset_A ₁）/TD_len）

offset_B=(TD_len*12*Delta_GSM_sfn/13+offset_A ₁)%TD_len

Wherein, the expansion frame number of the target frame that T3 is described first network, T1 ₁' be the expansion frame number of the initial frame of described first network, TD_len is the frame length of described first network frame, the difference of the frame number of the target frame that Delta_GSM_sfn is described second network and the frame number of initial frame, offset_A ₁for the initial frame of described second network is with respect to the skew of the initial frame of described first network, the target frame that offset_B is described second network is with respect to the skew of the target frame of described first network, and floor is rounding operation, and % is for getting remainder operation.

For addressing the above problem, technical solution of the present invention also provides a kind of synchronous follow-up device of mobile terminal, comprising:

Memory cell, for storing the cell information table group of second network, described cell information table group is made up of a service cell information table and M information of adjacent cells table, the number of the adjacent cell that wherein M is described Serving cell;

Updating block, be used at least synchronized result based on described mobile terminal or channel estimation results, upgrade described cell information table group, wherein, described synchronous or described the second terminal card that synchronously comprises described first terminal card synchronous, described channel estimating comprises the channel estimating of described first terminal card or the channel estimating of described the second terminal card;

Synchronous tracking cell, for the service cell information table based on described renewal, determine the position of the target frame of described second network, and receive take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Optionally, described cell information table comprises the BSIC of the community of second network, the frequency point number of the community of second network, the frame number of the initial frame of first network, the frame number of the initial frame of second network and the initial frame of described second network are with respect to the skew of the initial frame of described first network, wherein, the initial frame of described first network refers to the frame of the first network at first terminal card place described in the initial synchronisation moment, the initial frame of described second network refers to the frame of the second network at the second terminal card place described in the initial synchronisation moment, the moment of the described initial synchronisation moment, to be described the second terminal card be synchronized to take the synchronizing information of described first network as the benchmark base station of described second network.

Optionally, described updating block at least comprises following arbitrary unit:

The first updating block, for the initial synchronisation result based on described the second terminal card or based on described the second terminal card community switch after synchronized result, upgrade described cell information table group;

The second updating block, for the channel estimation results based on described the second terminal card, upgrades described cell information table group;

The 3rd updating block, for the synchronized result based on described first terminal card, upgrades described cell information table group;

The 4th updating block, for the channel estimation results based on described first terminal card, upgrades described cell information table group.

Optionally, described synchronous tracking cell, comprising:

Expansion frame number counting unit, frame number for the frame to described first network is expanded counting, and be recorded as expansion frame number, the scope of described expansion frame number be frame number scope N doubly, the count frequency of described expansion frame number is consistent with the count frequency of frame number, N is more than or equal to 2, and in the time that described first network switches, described expansion frame number will be counted again;

The first determining unit, for the expansion frame number of initial frame of the expansion frame number of the present frame based on first network, described first network and the frame number of the initial frame of second network, determines the frame number of the present frame of second network;

The second determining unit, for the frame number of the present frame based on described second network, determines the frame number of the target frame of second network;

The 3rd determining unit, frame number for the initial frame of the expansion frame number of initial frame based on described first network, described second network with respect to the skew of the initial frame of described first network and the target frame of second network, determines the skew with respect to the target frame of described first network of the expansion frame number of target frame of first network and the target frame of described second network.

Frame receiving element, is benchmark for the synchronizing information take described first terminal card, receives the target frame of described second network;

Frame decoding unit, is benchmark for the synchronizing information take described first terminal card, and the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Compared with prior art, in the method for synchronized of the mobile terminal that technical solution of the present invention proposes and device, introduce the concept of cell information table group, in described cell information table group, preserve the synchronizing information of Serving cell, synchronizing information mobile terminal based on Serving cell can accurately be located the position of the target frame of second network, thereby complete receiving the decode of target frame, finally make described the second terminal card keep take the synchronizing information of described first terminal card as benchmark and the base station synchronization of described second network.To the real-time update of synchronizing information in cell information table group, can guarantee the synchronous tracking of the base station to described second network of described the second terminal card.

And, in cell information table group, also include M information of adjacent cells table, can, for carrying out community when described the second terminal card while switching, directly call the cell information table of the adjacent cell that is switched to Serving cell, simplify synchronizing process, improve synchronizing speed.

In addition, utilize the expansion frame number that the count cycle extends to calculate, simplified the definite computation complexity of frame position.Meanwhile, directly by the frame obtaining from second network, the relative position system-frame is applied in the calculating of determining frame position, has further simplified the flow process of calculating, and has improved the efficiency of calculating, thereby has improved operational performance and the efficiency of mobile terminal.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the method for synchronized of the mobile terminal of technical solution of the present invention;

Fig. 2 is the synchronized result after switch community based on described the second terminal card of the embodiment of the present invention, upgrades the schematic flow sheet of described cell information table group;

Fig. 3 is the channel estimation results based on described the second terminal card of the embodiment of the present invention, upgrades the schematic flow sheet of described cell information table group;

Fig. 4 is the described synchronized result based on described first terminal card of the embodiment of the present invention, upgrades the schematic flow sheet of described cell information table group;

Fig. 5 is the service cell information table of the embodiment of the present invention based on upgrading, and the second terminal card keeps the synchronous schematic flow sheet of following the tracks of;

Fig. 6 is the schematic flow sheet of the target frame location positioning of the described second network of the embodiment of the present invention;

Fig. 7 is the structural representation of the described GSM51 multi-frame of the embodiment of the present invention;

Fig. 8 is the structural representation of the synchronous follow-up device of the mobile terminal of technical solution of the present invention;

Fig. 9 is the structural representation of synchronous tracking cell 13 shown in Fig. 8.

Embodiment

The application of multi-card mobile terminal is more and more extensive at present, but the resident network cell of each card of multi-card mobile terminal is general and asynchronous, in the time of a terminal card standby wherein, other-end card as this terminal card be how benchmark, keep synchronously following the tracks of, become the technical barrier that urgently needs at present solution.

For this problem, inventor has proposed a kind of method for synchronized of mobile terminal, as shown in Figure 1, comprising:

Step S1, sets up the cell information table group of second network, and described cell information table group is made up of a service cell information table and M information of adjacent cells table, the number of the adjacent cell that wherein M is described Serving cell;

Step S2, the at least synchronized result based on described mobile terminal or channel estimation results, upgrade described cell information table group, wherein, described synchronous or described the second terminal card that synchronously comprises described first terminal card synchronous, described channel estimating comprises the channel estimating of described first terminal card or the channel estimating of described the second terminal card;

Step S3, service cell information table based on described renewal, determine the position of the target frame of described second network, and receive take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Described mobile terminal can be dual-mode dual-card dual-standby or multimode dual-SIM-card dual-standby mobile terminal, and this mobile terminal can adopt single base band injection scheme frequently.Described the second terminal card can be the arbitrary terminal card except described first terminal card in mobile terminal.Described first network can be Generation Mobile Telecommunication System network, as global system for mobile communications (GSM, Global System for Mobile Communications) network, code division multiple access access (CDMA, Code Division Multiple Access) network; Also can be 3 G mobile communication network, as TD SDMA access (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access) network, Wideband Code Division Multiple Access (WCDMA) access (WCDMA, Wide Code Division Multiple Access) network; It can also be Long Term Evolution (LTE, Long Term Evolution) network.Described second network can be Generation Mobile Telecommunication System network, 3 G mobile communication network or LTE network.

For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below take first network as TD-SCDMA network, second network is that GSM network is example, by reference to the accompanying drawings technical solution of the present invention is described in detail.Figure 1 shows that the schematic flow sheet of the method for synchronized of the mobile terminal of technical solution of the present invention:

Step S1: set up the cell information table group of second network, described cell information table group is made up of a service cell information table and M information of adjacent cells table, the number of the adjacent cell that wherein M is described Serving cell.Described cell information table comprises the skew with respect to the initial frame of first network of the frame number of initial frame of frame number, second network of the initial frame of frequency point number, the first network of the community of BSIC, the second network of the community of second network and the initial frame of described second network.In the present embodiment, the initial frame of described first network refers to the frame of the first network at first terminal card place described in the initial synchronisation moment, and the initial frame of described second network refers to the frame of the second network at the second terminal card place described in the initial synchronisation moment.In single base band implementation of the embodiment of the present invention, the initial synchronisation moment refers to that described the second terminal card is synchronized to the moment of the base station of described second network take the synchronizing information of described first terminal card as benchmark.Skew according to the frame number of initial frame of the frame number of the initial frame of the described first network in described service cell information table, described second network and the initial frame of described second network with respect to the initial frame of described first network, the relative position of the target frame that mobile terminal just can be determined described second network in described first network, then receive take the synchronizing information of first terminal card as benchmark and the target frame of the second network of decoding, maintenance between the second terminal and the base station of second network is synchronizeed and follow the tracks of.

Along with the movement in described mobile terminal use procedure, the second terminal card also there will be the community from Serving cell to adjacent cell to switch, and the information that now just need to obtain the adjacent cell that is switched to Serving cell completes the synchronous tracking of second network.Therefore inventor has proposed in setting up service cell information table, also set up the method for information of adjacent cells table, while carrying out community switching with convenient the second terminal card, can directly call the cell information table of the adjacent cell that is switched to Serving cell, and need to be again from the relevant synchronizing information of system acquisition after switch community, accelerate the speed that system synchronization is followed the tracks of.Generally, the number of information of adjacent cells table is M, and the value of M is the number of the adjacent cell of second network system regulation.Meanwhile, if the BSIC information in cell information table and frequency point number information spinner in order to distinguish, the each cell information table of index.

Step S2: at least synchronized result based on described mobile terminal or channel estimation results, upgrade described cell information table group, wherein, described synchronous or described the second terminal card that synchronously comprises described first terminal card synchronous, described channel estimating comprises the channel estimating of described first terminal card or the channel estimating of described the second terminal card.

Wherein, described first terminal card synchronously refer to synchronizeing between first terminal card and the base station of first network, described the second terminal card synchronously refer to synchronizing information the synchronizeing as benchmark and the base station of second network between of the second terminal card take first terminal card.

Particularly, step S2 can be divided into following four kinds of situations, and in actual applications, step S2 may be following any one or a few situation:

The first situation: the initial synchronisation result based on described the second terminal card or based on described the second terminal card community switch after synchronized result, upgrade described cell information table group;

The second situation: based on the channel estimation results of described the second terminal card, upgrade described cell information table group;

The third situation: based on the synchronized result of described first terminal card, upgrade described cell information table group;

The 4th kind of situation: based on the channel estimation results of described first terminal card, upgrade described cell information table group.

Below four kinds of situations are elaborated respectively.

The first situation: the initial synchronisation result based on described the second terminal card or based on described the second terminal card community switch after synchronized result, upgrade described cell information table group.

The initial synchronization of described the second terminal card, namely described cell information table group is carried out initialized process.When described the second terminal card is take the synchronizing information of described first terminal card as benchmark, while being synchronized to first the base station of described second network, by direct parameters from cell information table group described in system acquisition, concrete, by the initial synchronisation moment, synchronizing channel (the SCH of described second network decodes, Synchronous Channel) and Broadcast Control Channel (BCCH, Broadcasting Control Channel) BSIC of the Serving cell that obtains and the frequency point number BSIC and the frequency point number that are recorded as M adjacent cell of the Serving cell that BSIC in described service cell information table and frequency point number obtain decoding SCH and BCCH be recorded as respectively described M BSIC and the frequency point number in information of adjacent cells table, by the initial synchronisation moment, the frame number of the frame of described first network is recorded as the frame number of the initial frame of the described first network in described service cell information table and described M information of adjacent cells table, by the initial synchronisation moment, the frame of the frame number of the frame of the Serving cell of described second network, the Serving cell of described second network is recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described service cell information table, described second network with respect to the skew of the initial frame of described first network with respect to the skew of the frame of described first network, by the initial synchronisation moment, the frame of the adjacent cell of the frame number of the frame of the adjacent cell of the Serving cell of described second network, the Serving cell of described second network is recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described information of adjacent cells table, described second network with respect to the skew of the initial frame of described first network with respect to the skew of the frame of described first network.

Described the second terminal card is in the process using, switch very common from Serving cell to the community of a certain adjacent cell, now can directly in information of adjacent cells table, search for and call the information of adjacent cells table of coupling, in conjunction with the synchronized result after switch community based on described the second terminal card of the embodiment of the present invention shown in Fig. 2, upgrade the schematic flow sheet of described cell information table group, first perform step S201: decoding SCH and BCCH obtain BSIC and the frequency point number (BSIC and the frequency point number of the Serving cell after namely switching) of the Serving cell of second network, and be recorded as BSIC and the frequency point number in described service cell information table.

Then perform step S202: take the BSIC in described service cell information table and frequency point number as index, the information of adjacent cells table of search coupling in described M information of adjacent cells table.

Perform step again S203, directly call the information of adjacent cells table of described coupling, the frame number of initial frame of the frame number of the initial frame of the described first network in the information of adjacent cells table of described coupling, described second network and the initial frame of described second network are filled in described service cell information table accordingly with respect to the skew of the initial frame of described first network.

Execution step S204: BSIC and the frequency point number of the M of the Serving cell after the switching that described in carrying recorded decoding, the synchronizing channel of second network and Broadcast Control Channel an obtain adjacent cell.

Finally perform step S205: take the BSIC of M adjacent cell of the Serving cell after described switching and frequency point number as index, described M information of adjacent cells table upgraded.When the second terminal card of mobile terminal switches to adjacent cell from the Serving cell of second network, new adjacent cell list may be that change has occurred part, therefore in this step, only the information of adjacent cells table changing in adjacent cell list is upgraded, and unchanged information of adjacent cells is still retained and do not upgraded.Concrete, take the BSIC of M adjacent cell of the Serving cell after described switching and frequency point number as index, search for described M information of adjacent cells table, when BSIC and frequency point number are not mated, the BSIC of the adjacent cell of the Serving cell after described switching and frequency point number are recorded as to BSIC and the frequency point number in described information of adjacent cells table, by the initial synchronisation moment, the frame number of the frame of the adjacent cell of the Serving cell after described switching, the frame of the adjacent cell of the Serving cell after described switching is recorded as respectively the frame number of the initial frame of the described second network in described information of adjacent cells table with respect to the skew of the frame of described first network, the initial frame of described second network is with respect to the skew of the initial frame of described first network, the frame number of the frame of first network described in the initial synchronisation moment is recorded as to the frame number of the initial frame of the described first network in described information of adjacent cells table.

The second situation: based on the channel estimation results of described the second terminal card, upgrade described cell information table group.The Main Function of channel estimating is the details that obtain channel, and mobile terminal can be made corresponding compensation and adjustment to receive channel in the time receiving signal like this, the further correct signal that demodulates reception, the performance of raising system.The result of channel estimating comprises amplitude information and phase information, and the amplitude and the receiving position that after channel estimating, receive signal all may be adjusted.In the time that the received bit of reception signal is equipped with adjustment, just need to upgrade cell information table group.

In the embodiment of the present invention, the channel estimating of described the second terminal card comprises two kinds, one is that described the second terminal card is in the time carrying out BSIC confirmation, the channel estimating that the training sequence of synchronizing channel is carried out, another is described the second terminal card in the time receiving four frame data of broadcast channel or paging channel, the channel estimating that every frame data are carried out.After channel estimation calculation completes, can obtain the adjustment amount of the position of the frame of described second network, then according to the adjustment amount of the position of the frame of described second network, cell information table group be upgraded.

Particularly, in conjunction with the channel estimation results based on described the second terminal card of the embodiment of the present invention shown in Fig. 3, upgrade the schematic flow sheet of described cell information table group, take the first channel estimating as example, first perform step S301, in the time that described the second terminal card carries out BSIC confirmation, the training sequence of synchronizing channel is carried out to channel estimating, obtain the position adjustment amount Gsm_irt of the frame of described second network.

Carry out again execution step S302, the unit of Gsm_irt is converted to eighth TD-SCDMA chip lengths from 1/4th GSM symbol lengths, obtain primary importance deviation D elta_time2_offset1.

Then perform step S303, upgrade successively the initial frame of the described second network in service cell information table and information of adjacent cells table with respect to the skew offset_A of the initial frame of described first network according to following computing formula _n:

offset_A _N=offset_A _N+Delta_time2_offset1

Wherein the span of subscript N is 1 to M+1, is to be expressed as Serving cell at 1 o'clock, 2 to M+1, be expressed as successively first to M adjacent cell.Due to the offset_A after upgrading _nlength may be greater than the length of a TD-SCDMA frame, therefore to perform step S304, the offset_A after judgement is upgraded _nlength whether be greater than the length T D_len of a TD-SCDMA frame.If be not more than, execution step S305, upgrades service cell information table and M the offset_A in information of adjacent cells table successively _n; If be greater than, execution step S306 need to upgrade the initial frame of the described second network in service cell information table and M information of adjacent cells table with respect to the skew offset_A of the initial frame of described first network simultaneously _nframe number T1 with the initial frame of first network _n, computing formula is as follows:

offset_A _N=offset_A _N+(offset_A _N%TD_len)

T1 _N=T1 _N+floor(offset_A _N/TD_len)

Wherein the span of subscript N is 1 to M+1, is to be expressed as Serving cell at 1 o'clock, 2 to M+1, be expressed as successively first to M adjacent cell, and % is complementation, floor is rounding operation.

In the time that described the second terminal card carries out the second channel estimating, in the time that described the second terminal card receives four frame data of broadcast channel or paging channel, every frame data are carried out to channel estimating, if the broadcast channel of second network or paging channel decode results are correct, the results averaged of the channel estimating of four frame data to described broadcast channel or paging channel, obtains the second place deviation of the frame of described second network; Then upgrade cell information table group according to second place deviation, its process and above-mentioned steps S303 ~ S306 are similar, do not repeat them here.

The third situation: based on the synchronized result of described first terminal card, upgrade described cell information table group.The base station of described first terminal card and described first network completes after initial synchronisation, also can carry out periodically thick synchronous and smart synchronous to guarantee the synchronization accuracy of described first terminal card.After synchronously thick and essence synchronously completes at every turn, all may adjust the position of the frame of described first network, therefore, when in the time that described first terminal card is synchronously adjusted, if after decoding broadcast channel the frame number of the frame of described first network have adjust and adjustment amount be the first frame number deviation,, based on described the first frame number deviation, upgrade the frame number of the initial frame of the described first network in described service cell information table and M information of adjacent cells table; If it is the 3rd position deviation that there are adjustment and adjustment amount in the position of the frame of described first network, upgrade the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network based on described the 3rd position deviation.

Particularly, in conjunction with the described synchronized result based on described first terminal card of the embodiment of the present invention shown in Fig. 4, upgrade the schematic flow sheet of described cell information table group, first perform step S401, from the adjustment amount of the position of the frame of first network described in system acquisition, i.e. the 3rd position deviation Delta_time1_offset.

Perform step again S402, upgrade successively the initial frame of the described second network in service cell information table and information of adjacent cells table with respect to the skew offset_A of the initial frame of described first network according to following computing formula _n:

offset_A _N=offset_A _N+Delta_time1_offset

Wherein the span of subscript N is 1 to M+1, is to be expressed as Serving cell at 1 o'clock, 2 to M+1, be expressed as successively first to M adjacent cell.

Then perform step S403, the offset_A after judgement is upgraded _nlength whether be greater than TD_len.

If be not more than, execution step S404, upgrades service cell information table and M the offset_A in information of adjacent cells table successively _n; If be greater than, execution step S405 need to upgrade the offset_A in service cell information table and M information of adjacent cells table simultaneously _nand T1 _n, computing formula is as follows:

offset_A _N=offset_A _N+(offset_A _N%TD_len)

T1 _N=T1 _N+floor(offset_A _N/TD_len)

In addition, described first terminal is stuck in each thick synchronous and essence when synchronous, and the frame number of the frame of the first network that decoding first network decoding broadcast channel BCH obtains may have adjustment, and adjustment amount i.e. the first frame number deviation is Δ T1 _n, can directly upgrade according to following formula the frame number of the initial frame of the described first network in described service cell information table and described M information of adjacent cells table:

T1 _N=T1 _N+ΔT1 _N

The 4th kind of situation: based on the channel estimation results of described first terminal card, upgrade described cell information table group.Described first terminal is stuck in while receiving data, can do channel estimating to the training sequence of each conventional time slot, obtains the adjustment amount of the position of the frame of described first network, so that system reaches better performance.First first terminal is stuck in while receiving data, the training sequence of each conventional time slot is carried out to channel estimating, obtain the adjustment amount of the position of the frame of first network, i.e. the 4th position deviation Delta_time1_offset1, then according to the 4th position deviation Delta_time1_offset1, cell information table group is upgraded, concrete step of updating is consistent with the step of updating of describing in the third situation, does not repeat them here.

Step S3: the service cell information table based on described renewal, determine the position of the target frame of described second network, and receive take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

Particularly, the service cell information table in conjunction with the embodiment of the present invention shown in Fig. 5 based on upgrading, the second terminal card keeps the synchronous schematic flow sheet of following the tracks of, and first performs step S501, and the frame number expansion of the frame to described first network is counted as to expansion frame number.Wherein, the count frequency of described expansion frame number is consistent with the count frequency of frame number, the scope of described expansion frame number be frame number scope N doubly, N is more than or equal to 2, in the time that described first network switches, described expansion frame number will be counted again.Technical solution of the present invention has proposed concept and the related algorithm of expansion frame number, the scope of expansion frame number be frame number scope N doubly, the count frequency of described expansion frame number is consistent with the count frequency of frame number, N is more than or equal to 2, utilize described expansion frame number to carry out the counting of frame number, extend the count cycle of frame number, can reduce the number of times of counting again of frame number, calculated thereby simplify.In mobile terminal, can design an expansion frame number counter, for expansion frame number is counted.N can be according to practical application, the switching cycle of the count cycle of coupling system to frame number and described first network and second network and determining.In the present embodiment, the frame number scope of TD-SCDMA is with hexadecimal representation from 0x0000 to 0x1FFF(), step-length is 2.If directly use the frame number of TD-SCDMA to calculate, every mistake will be upgraded the frame number of TD-SCDMA for 40.96 seconds in algorithm, may occur the phenomenon that the frame number multicycle repeats in calculating, can increase the EMS memory occupation of system and extend the time of calculating.When mobile terminal generation network switches, the System Frame Number of network also will be counted again, can bring equally the adverse effect that increases Installed System Memory and extend computing time.System Frame Number is expanded after calculating, just can be solved the above problems.In the present embodiment, the scope of the expansion frame number after expansion is 0x00000000 ~ 0x3FFFFFFF, and the count cycle of expansion frame number is roughly equivalent to 62 days.Under normal circumstances, within 62 days, the switching to another network of TD-SCDMA network occurs to I haven't seen you for ages, in the time network occurs switching, expansion frame number is counted again, is difficult to the repeat count of the expansion frame number that occurs TD-SCDMA network.

Then perform step S502: the frame number of the expansion frame number of the initial frame of the expansion frame number of the present frame based on first network, described first network and the initial frame of described second network, determine the frame number of the present frame of second network.In conjunction with the schematic flow sheet of the target frame location positioning of the described second network of the embodiment of the present invention shown in Fig. 6, first calculate the present frame of described TD-SCDMA network and the expansion frame number difference Delta_TD_esfn1 of initial frame, i.e. Delta_TD_esfn1=T2-T1 ₁', wherein T1 ₁' be the expansion frame number of the initial frame of first network, the expansion frame number (expanding the current count value of frame number counter) of the present frame that T2 is first network; Then according to the proportionate relationship of the frame length GSM_len of the frame length TD_len of TD-SCDMA network and GSM network, be 12*TD_len=13*GSM_len, can obtain the first frame number difference Delta_GSM_sfn of second network present frame and initial frame, be Delta_GSM_sfn1=ceil (Delta_TD_esfn1*12/13), wherein ceil is the computing that rounds up; Then, the frame number G1 of the initial frame based on described the first frame number difference Delta_GSM_sfn1 and GSM network just can obtain the frame number G2 of the present frame of GSM network, i.e. G2=G1+Delta_GSM_sfn1.

Perform step again S503: the frame number of the present frame based on described second network, determine the frame number of the target frame of second network.What mobile terminal from GSM network system was obtained is the relative frame number in GSM51 multi-frame, determine the frame number of the target frame of second network, also needs to know the frame number of the GSM51 multi-frame after synchronous, calculates more complicated.And in the present embodiment, directly utilize frame from the GSM Network Capture relative frame number GSM51 multi-frame to calculate the second frame number difference, and then calculate the frame number of the target frame of described second network, further simplify the flow process of calculating, improve the efficiency of calculating.

Particularly, step S503 comprises: obtain the target frame of second network and the second frame number difference of present frame; Frame number based on described second network present frame and described the second frame number difference are determined the frame number of the target frame of second network.The target frame of described second network is the frame that described the second terminal card will receive.Wherein, described in, obtain the target frame of second network and the second frame number difference of present frame comprises: the target frame of obtaining described second network in GSM51 multi-frame corresponding first-phase to frame number; The present frame that calculates described second network in GSM51 multi-frame corresponding second-phase to frame number; Calculate described first-phase to frame number and second-phase the difference to frame number, to obtain described the second frame number difference.As shown in Figure 7, in Fig. 7, F represents frequency correction channel (FCCH, Frequency Correction Channel) frame to the structure of GSM51 multi-frame, and every lattice represent 1 frame; S represents SCH frame, and every lattice represent 1 frame; B represents BCCH frame, and every lattice represent 4 frames; C represents Common Control Channel (CCCH, Common Control Channel) frame, and every lattice represent 4 frames, and CCCH can carry PCH and expansion BCCH; I represents Idle frame, and every lattice represent 1 frame.Take the target frame of second network as BCCH frame is as example, in conjunction with reference to figure 6 and Fig. 7, by the frame number G2 of the present frame of described second network divided by 51 remainder numbers, the present frame that just can obtain described second network at the described second-phase of GSM51 multi-frame to frame number, if described first-phase is greater than second-phase to frame number to frame number, described the second frame number difference Delta_GSM_sfn2 just equals described first-phase frame number is deducted to second-phase to frame number, if described first-phase is less than second-phase to frame number to frame number, described the second frame number difference Delta_GSM_sfn2 just equals described first-phase and frame number is added to 51 deducts described second-phase to frame number again.Suppose to need the BCCH framing bit receiving in the 5th C frame, the frame number of the present frame of second network is 120, and so described first-phase is just 27 to frame number, and described second-phase is just 18 to frame number, and described the second frame number difference Delta_GSM_sfn2 is just 9.The frame number G3=G2+Delta_GSM_sfn2 of the target frame of described second network.The calculating of the frame number of the present frame of second network described in integrating step S502, can obtain G3=G1+Delta_GSM_sfn1+Delta_GSM_sfn2, the frame number difference Delta_GSM_sfn=Delta_GSM_sfn1+Delta_GSM_sfn2 between target frame and the initial frame of described second network.

Perform step again S504: the initial frame of the expansion frame number of the initial frame based on described first network, described second network is with respect to the frame number of the skew of the initial frame of described first network and the target frame of second network, determine the skew with respect to the target frame of described first network of the expansion frame number of target frame of first network and the target frame of described second network.

Concrete, the expansion frame number T3 of the target frame of described first network determines according to following formula:

T3=T1 ₁’+floor（（TD_len*12*Delta_GSM_sfn/13+offset_A ₁）/TD_len）

Wherein, floor is rounding operation.

The target frame of described second network is determined according to following formula with respect to the skew offset_B of the target frame of first network:

offset_B=(TD_len*12*Delta_GSM_sfn/13+offset_A ₁)%TD_len

Wherein, % is remainder operation.

It should be noted that the offset_A relating in step in the present embodiment ₁, offset_B, TD_len and GSM_len unit 1/8th chip lengths that are TD-SCDMA.

Finally perform step S505: the expansion frame number of the target frame based on described first network and the target frame of described second network are with respect to the skew of the target frame of first network, take the synchronizing information of described first terminal card as benchmark, receive the target frame of described second network, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

It should be noted that the offset_A relating in step in the present embodiment _n, offset_B, TD_len and GSM_len unit 1/8th chip lengths that are TD-SCDMA.And offset_A _n, offset_B, Delta_time1_offset, Delta_sfn1_offset, Delta_time2_offset1 be the value of symbol, represents to lag behind during for positive number, represents leading during for negative.Meanwhile, step S1 is also signed calculating to the relevant calculating relating in S3.

Based on the method for synchronized of above-mentioned mobile terminal, technical solution of the present invention also provides a kind of synchronous follow-up device of mobile terminal.Fig. 8 is the structural representation of the synchronous follow-up device of the mobile terminal of technical solution of the present invention, consult Fig. 8, the synchronous follow-up device of described mobile terminal comprises: memory cell 11, for the cell information table group of storing second network, described memory cell group is made up of a service cell information table storing sub-units and M information of adjacent cells table storing sub-units, the number of the adjacent cell that wherein M is described Serving cell; Updating block 12, be used at least synchronized result based on described mobile terminal or channel estimation results, upgrade described cell information table group, wherein, described synchronous or described the second terminal card that synchronously comprises described first terminal card synchronous, described channel estimating comprises the channel estimating of described first terminal card or the channel estimating of described the second terminal card; Synchronous tracking cell 13, for the service cell information table based on described renewal, determine the position of the target frame of described second network, and receive take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

In the present embodiment, described updating block 12 comprises the first updating block 121, for the initial synchronisation result based on described the second terminal card or based on described the second terminal card community switch after synchronized result, upgrade described cell information table group; The second updating block 122, for the channel estimation results based on described the second terminal card, upgrades described cell information table group; The 3rd updating block 123, for the synchronized result based on described first terminal card, upgrades described cell information table group; The 4th updating block 124, for the channel estimation results based on described first terminal card, upgrades described cell information table group.In other embodiments, described updating block 12 also can comprise above-mentioned any or appoint several.

In embodiments of the present invention, described the first updating block 121 comprises: first upgrades subelement, for the initial synchronisation result based on described the second terminal card, upgrades described cell information table group; Second upgrades subelement, for the synchronized result after switch community based on described the second terminal card, upgrades described cell information table group.

Described first upgrades subelement comprises: the first acquiring unit, is recorded as BSIC and the frequency point number of described service cell information table for the BSIC of the synchronizing channel of described second network that the initial synchronisation moment is decoded and described Serving cell that broadcast channel obtains and a described M adjacent cell and frequency point number; Second acquisition unit, for being recorded as the frame number of the frame of first network described in the initial synchronisation moment frame number of the initial frame of the described first network of described service cell information table; The 3rd acquiring unit, for the skew with respect to the frame of described first network by the frame of the Serving cell of the frame number of the frame of the Serving cell of second network described in the initial synchronisation moment, described second network, be recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described service cell information table, described second network with respect to the skew of the initial frame of described first network; The 4th acquiring unit, for the side-play amount with respect to the frame of described first network by the frame of the adjacent cell of the Serving cell of the frame number of the frame of the adjacent cell of the Serving cell of second network described in the initial synchronisation moment, described second network, be recorded as respectively the skew with respect to the initial frame of described first network of the frame number of initial frame of the described second network in described information of adjacent cells table and the initial frame of described second network.

Described second upgrades subelement comprises: the first record cell, after switching in described the second terminal card community, by decoding, the synchronizing channel of described second network and the BSIC of the Serving cell that Broadcast Control Channel obtains and frequency point number are recorded as BSIC and the frequency point number in described service cell information table; Search unit, is index for the BSIC take described service cell information table and frequency point number, the information of adjacent cells table of search coupling in described M information of adjacent cells table; Call unit, for calling the skew with respect to the initial frame of described first network of the frame number of initial frame of frame number, described second network of initial frame of described first network of information of adjacent cells table of described coupling and the initial frame of described second network, and be recorded as respectively the skew with respect to the initial frame of described first network of the frame number of initial frame of the frame number of the initial frame of the described first network in described service cell information table, described second network and the initial frame of described second network; The second record cell, BSIC and the frequency point number of M adjacent cell of the Serving cell after the switching obtaining for synchronizing channel and the Broadcast Control Channel of second network described in carrying recorded decoding; Information of adjacent cells table updating block, is index for BSIC and the frequency point number of M adjacent cell of the Serving cell take after described switching, and described M information of adjacent cells table upgraded.

Described information of adjacent cells table updating block further comprises: search matching unit is index for BSIC and the frequency point number of M adjacent cell of the Serving cell take after described switching, searches for described M information of adjacent cells table, information of adjacent cells table upgrades subelement, for in the time that BSIC and frequency point number are not mated, the BSIC of the adjacent cell of the Serving cell after described switching and frequency point number are recorded as to BSIC and the frequency point number in described information of adjacent cells table, by the initial synchronisation moment, the frame number of the frame of the adjacent cell of the Serving cell after described switching, the frame of the adjacent cell of the Serving cell after described switching is recorded as respectively the frame number of the initial frame of the described second network in described information of adjacent cells table with respect to the skew of the frame of described first network, the initial frame of described second network is with respect to the skew of the initial frame of described first network, the frame number of the frame of first network described in the initial synchronisation moment is recorded as to the frame number of the initial frame of the described first network in described information of adjacent cells table.

In embodiments of the present invention, described the second updating block 122 comprises: primary importance deviation acquiring unit, be used for, in the time that described the second terminal card carries out BSIC confirmation, the training sequence of synchronizing channel being carried out to channel estimating, obtain the primary importance deviation of the frame of described second network; Second place deviation acquiring unit, for in the time that described the second terminal card receives four frame data of broadcast channel or paging channel, every frame data are carried out to channel estimating, if the broadcast channel of second network or paging channel decode results are correct, the results averaged of the channel estimating of four frame data to described broadcast channel or paging channel, obtains the second place deviation of the frame of described second network; Subelement is upgraded in the first skew, for at least based on described primary importance deviation or described second place deviation, upgrade respectively the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network.

In embodiments of the present invention, described the 3rd updating block 123 comprises: frame number upgrades subelement, for in the time that described first terminal card is synchronously adjusted, if after decoding broadcast channel the frame number of the frame of described first network have adjust and adjustment amount be the first frame number deviation,, based on described the first frame number deviation, upgrade the frame number of the initial frame of the described first network in described service cell information table and M information of adjacent cells table; Subelement is upgraded in the second skew, for in the time that described first terminal card is synchronously adjusted, if it is the 3rd position deviation that there are adjustment and adjustment amount in the position of the frame of described first network, upgrade the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network based on described the 3rd position deviation.

In embodiments of the present invention, described the 4th updating block 124 comprises: the 4th position deviation acquiring unit, for in the time that data are received in described first terminal clamping, the training sequence of each conventional time slot is carried out to channel estimating, the adjustment amount that obtains the frame position of described first network is the 4th position deviation; Subelement is upgraded in the 3rd skew, for based on described the 4th position deviation, upgrades the initial frame of the described second network in a described service cell information table and described M information of adjacent cells table with respect to the skew of the initial frame of described first network.

In embodiments of the present invention, the structure of described synchronous tracking cell 13 as shown in Figure 9, comprising: expansion frame number counting unit 131, for the frame number of the frame of described first network is expanded to counting, and is recorded as expansion frame number; The first determining unit 132, for the expansion frame number of initial frame of the expansion frame number of the present frame based on first network, described first network and the frame number of the initial frame of second network, determines the frame number of the present frame of second network; The second determining unit 133, for the frame number of the present frame based on described second network, determines the frame number of the target frame of second network; The 3rd determining unit 134, frame number for the initial frame of the expansion frame number of initial frame based on described first network, described second network with respect to the skew of the initial frame of described first network and the target frame of second network, determines the skew with respect to the target frame of described first network of the expansion frame number of target frame of first network and the target frame of described second network; Frame receiving element 135, is benchmark for the synchronizing information take described first terminal card, receives the target frame of described second network; Frame decoding unit 136, is benchmark for the synchronizing information take described first terminal card, and the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card.

In the embodiment of the present invention, the first determining unit 132 comprises: expansion frame number difference computational unit, for calculating the expansion frame number difference of present frame and initial frame of first network; The first frame number difference computational unit, for according to the frame length proportionate relationship of first network and second network and described expansion frame number difference, calculates the present frame of second network and the first frame number difference of initial frame; Current frame number determining unit, for the frame number of the initial frame based on described the first frame number difference and second network, determines the frame number of the present frame of second network.The second determining unit 133 comprises: the second frame number difference acquiring unit, for obtaining the target frame of second network and the second frame number difference of present frame; Target frame number determining unit, determines the frame number of the target frame of second network for the frame number of the present frame based on described second network and described the second frame number difference.

In the present embodiment, described second network is GSM network, and described the second frame number difference acquiring unit comprises: first-phase is to frame number acquiring unit, for the target frame of obtaining described second network at first-phase corresponding to GSM51 multi-frame to frame number; Second-phase is to frame number computing unit, for the present frame that calculates described second network at second-phase corresponding to GSM51 multi-frame to frame number; The second frame number difference computational unit, for calculate described first-phase to frame number and second-phase the difference to frame number, to obtain described the second frame number difference.

Described the 3rd determining unit 134, for calculating the skew with respect to the target frame of described first network of the expansion frame number of target frame of described first network and the target frame of described second network, formula is as follows:

T3=T1 ₁’+floor（（TD_len*12*Delta_GSM_sfn/13+offset_A ₁）/TD_len）

offset_B=(TD_len*12*Delta_GSM_sfn/13+offset_A ₁)%TD_len

Technical solution of the present invention also provides a kind of mobile terminal that comprises above-mentioned synchronous follow-up device.

It will be appreciated by those skilled in the art that, realizing in above-described embodiment mobile terminal and all or part of of synchronous follow-up device thereof is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in computer-readable recording medium, and described storage medium can be ROM, RAM, magnetic disc, CD etc.

Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.

Claims

1. a method for synchronized for mobile terminal, is characterized in that, the first terminal card in described mobile terminal resides in first network, and the second terminal card resides in second network, and the method for synchronized of described mobile terminal comprises:

2. the method for synchronized of mobile terminal according to claim 1, it is characterized in that, described cell information table comprises the BSIC of the community of second network, the frequency point number of the community of second network, the frame number of the initial frame of first network, the frame number of the initial frame of second network and the initial frame of described second network are with respect to the skew of the initial frame of described first network, wherein, the initial frame of described first network refers to the frame of the first network at first terminal card place described in the initial synchronisation moment, the initial frame of described second network refers to the frame of the second network at the second terminal card place described in the initial synchronisation moment, the moment of the described initial synchronisation moment, to be described the second terminal card be synchronized to take the synchronizing information of described first terminal card as the benchmark base station of described second network.

3. the method for synchronized of mobile terminal according to claim 1, is characterized in that, the described synchronized result based on described the second terminal card is upgraded described cell information table group, comprising:

4. the method for synchronized of mobile terminal according to claim 3, is characterized in that, the described initial synchronisation result based on described the second terminal card is upgraded described cell information table group, comprising:

5. the method for synchronized of mobile terminal according to claim 3, is characterized in that, described based on described the second terminal card community switch after synchronized result, upgrade described cell information table group, comprising:

6. the method for synchronized of mobile terminal according to claim 5, is characterized in that, the BSIC of the M of described Serving cell after a described switching adjacent cell and frequency point number are index, and described M information of adjacent cells table upgraded, and comprising:

7. the method for synchronized of mobile terminal according to claim 1, is characterized in that, the described channel estimation results based on described the second terminal card upgrades described cell information table group, comprising:

8. the method for synchronized of mobile terminal according to claim 1, is characterized in that, the described synchronized result based on described first terminal card is upgraded described cell information table group, comprising:

9. the method for synchronized of mobile terminal according to claim 1, is characterized in that, the described channel estimation results based on described first terminal card upgrades described cell information table group, comprising:

10. the method for synchronized of mobile terminal according to claim 1, it is characterized in that, the described service cell information table based on described renewal, determine the position of the target frame of described second network, and receive take the synchronizing information of described first terminal card as benchmark, the target frame of the described second network of decoding, to keep the synchronous tracking of described the second terminal card, comprising:

The method for synchronized of 11. mobile terminals according to claim 10, is characterized in that, the expansion frame number of the expansion frame number of the described present frame based on first network and the initial frame of described first network is determined and comprised the frame number of the present frame of second network:

The method for synchronized of 12. mobile terminals according to claim 10, is characterized in that, the frame number of the described present frame based on described second network determines that the frame number of the target frame of second network comprises:

The method for synchronized of 13. mobile terminals according to claim 12, is characterized in that, described second network is GSM network, described in obtain the target frame of second network and the second frame number difference of present frame comprises the steps:

The method for synchronized of 14. mobile terminals according to claim 10, is characterized in that, the expansion frame number of the target frame of described first network and the target frame of described second network are as follows with respect to the computing formula of the skew of the target frame of described first network:

T3=T1 ₁’+floor（（TD_len*12*Delta_GSM_sfn/13+offset_A ₁）/TD_len）

offset_B=(TD_len*12*Delta_GSM_sfn/13+offset_A ₁)%TD_len

The synchronous follow-up device of 15. 1 kinds of mobile terminals, is characterized in that, the first terminal card in described mobile terminal resides in first network, and the second terminal card resides in second network, and the synchronous follow-up device of described mobile terminal comprises:

The synchronous follow-up device of 16. mobile terminals according to claim 15, it is characterized in that, described cell information table comprises the BSIC of the community of second network, the frequency point number of the community of second network, the frame number of the initial frame of first network, the frame number of the initial frame of second network and the initial frame of described second network are with respect to the skew of the initial frame of described first network, wherein, the initial frame of described first network refers to the frame of the first network at first terminal card place described in the initial synchronisation moment, the initial frame of described second network refers to the frame of the second network at the second terminal card place described in the initial synchronisation moment, the moment of the described initial synchronisation moment, to be described the second terminal card be synchronized to take the synchronizing information of described first terminal card as the benchmark base station of described second network.

The synchronous follow-up device of 17. mobile terminals according to claim 15, is characterized in that, described updating block at least comprises following arbitrary unit:

The synchronous follow-up device of 18. mobile terminals according to claim 17, is characterized in that, described the first updating block at least comprises following arbitrary unit:

First upgrades subelement, for the initial synchronisation result based on described the second terminal card, upgrades described cell information table group;

Second upgrades subelement, for the synchronized result after switch community based on described the second terminal card, upgrades described cell information table group.

The synchronous follow-up device of 19. mobile terminals according to claim 18, is characterized in that, described first upgrades subelement, comprising:

The first acquiring unit, is recorded as BSIC and the frequency point number of described service cell information table for the BSIC of the synchronizing channel of described second network that the initial synchronisation moment is decoded and described Serving cell that broadcast channel obtains and a described M adjacent cell and frequency point number;

Second acquisition unit, for being recorded as the frame number of the frame of first network described in the initial synchronisation moment frame number of the initial frame of the described first network of described service cell information table;

The 3rd acquiring unit, for the skew with respect to the frame of described first network by the frame of the Serving cell of the frame number of the frame of the Serving cell of second network described in the initial synchronisation moment, described second network, be recorded as respectively the initial frame of the frame number of the initial frame of the described second network in described service cell information table, described second network with respect to the skew of the initial frame of described first network;

The 4th acquiring unit, for the side-play amount with respect to the frame of described first network by the frame of the adjacent cell of the Serving cell of the frame number of the frame of the adjacent cell of the Serving cell of second network described in the initial synchronisation moment, described second network, be recorded as respectively the skew with respect to the initial frame of described first network of the frame number of initial frame of the described second network in described information of adjacent cells table and the initial frame of described second network.

The synchronous follow-up device of 20. mobile terminals according to claim 18, is characterized in that, described second upgrades subelement, comprising:

The first record cell, after switching in described the second terminal card community, by decoding, the synchronizing channel of described second network and the BSIC of the Serving cell that Broadcast Control Channel obtains and frequency point number are recorded as BSIC and the frequency point number in described service cell information table;

Search unit, is index for the BSIC take described service cell information table and frequency point number, the information of adjacent cells table of search coupling in described M information of adjacent cells table;

Call unit, for calling the skew with respect to the initial frame of described first network of the frame number of initial frame of frame number, described second network of initial frame of described first network of information of adjacent cells table of described coupling and the initial frame of described second network, and be recorded as respectively the skew with respect to the initial frame of described first network of the frame number of initial frame of the frame number of the initial frame of the described first network in described service cell information table, described second network and the initial frame of described second network;

The second record cell, BSIC and the frequency point number of M adjacent cell of the Serving cell after the switching obtaining for synchronizing channel and the Broadcast Control Channel of second network described in carrying recorded decoding;

Information of adjacent cells table updating block, is index for BSIC and the frequency point number of M adjacent cell of the Serving cell take after described switching, and described M information of adjacent cells table upgraded.

The synchronous follow-up device of 21. mobile terminals according to claim 20, is characterized in that, described information of adjacent cells table updating block comprises:

Search matching unit, is index for BSIC and the frequency point number of M adjacent cell of the Serving cell take after described switching, searches for described M information of adjacent cells table;

Information of adjacent cells table upgrades subelement, for in the time that BSIC and frequency point number are not mated, the BSIC of the adjacent cell of the Serving cell after described switching and frequency point number are recorded as to BSIC and the frequency point number in described information of adjacent cells table, by the initial synchronisation moment, the frame number of the frame of the adjacent cell of the Serving cell after described switching, the frame of the adjacent cell of the Serving cell after described switching is recorded as respectively the frame number of the initial frame of the described second network in described information of adjacent cells table with respect to the skew of the frame of described first network, the initial frame of described second network is with respect to the skew of the initial frame of described first network, the frame number of the frame of first network described in the initial synchronisation moment is recorded as to the frame number of the initial frame of the described first network in described information of adjacent cells table.

The synchronous follow-up device of 22. mobile terminals according to claim 17, is characterized in that, described the second updating block, comprising:

Primary importance deviation acquiring unit, for carry out at described the second terminal card BSIC confirm time, the training sequence of synchronizing channel is carried out to channel estimating, obtain the primary importance deviation of the frame of described second network;

Second place deviation acquiring unit, for in the time that described the second terminal card receives four frame data of broadcast channel or paging channel, every frame data are carried out to channel estimating, if the broadcast channel of second network or paging channel decode results are correct, the results averaged of the channel estimating of four frame data to described broadcast channel or paging channel, obtains the second place deviation of the frame of described second network;

Subelement is upgraded in the first skew, for at least based on described primary importance deviation or described second place deviation, upgrade respectively the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network.

The synchronous follow-up device of 23. mobile terminals according to claim 17, is characterized in that, described the 3rd updating block comprises:

Frame number upgrades subelement, for in the time that described first terminal card is synchronously adjusted, if after decoding broadcast channel the frame number of the frame of described first network have adjust and adjustment amount be the first frame number deviation,, based on described the first frame number deviation, upgrade the frame number of the initial frame of the described first network in described service cell information table and M information of adjacent cells table;

Subelement is upgraded in the second skew, for in the time that described first terminal card is synchronously adjusted, if it is the 3rd position deviation that there are adjustment and adjustment amount in the position of the frame of described first network, upgrade the initial frame of the described second network in described service cell information table and M information of adjacent cells table with respect to the skew of the initial frame of described first network based on described the 3rd position deviation.

The synchronous follow-up device of 24. mobile terminals according to claim 17, is characterized in that, described the 4th updating block, comprising:

The 4th position deviation acquiring unit, in the time that data are received in described first terminal clamping, carries out channel estimating to the training sequence of each conventional time slot, and the adjustment amount that obtains the frame position of described first network is the 4th position deviation;

Subelement is upgraded in the 3rd skew, for based on described the 4th position deviation, upgrades the initial frame of the described second network in a described service cell information table and described M information of adjacent cells table with respect to the skew of the initial frame of described first network.

The synchronous follow-up device of 25. mobile terminals according to claim 15, is characterized in that, described synchronous tracking cell, comprising:

The 3rd determining unit, frame number for the initial frame of the expansion frame number of initial frame based on described first network, described second network with respect to the skew of the initial frame of described first network and the target frame of second network, determines the skew with respect to the target frame of described first network of the expansion frame number of target frame of first network and the target frame of described second network;

The synchronous follow-up device of 26. mobile terminals according to claim 25, is characterized in that, described the first determining unit comprises:

Expansion frame number difference computational unit, for calculating the expansion frame number difference of present frame and initial frame of first network;

The first frame number difference computational unit, for according to the frame length proportionate relationship of first network and second network and described expansion frame number difference, calculates the present frame of second network and the first frame number difference of initial frame; Current frame number determining unit, for the frame number of the initial frame based on described the first frame number difference and second network, determines the frame number of the present frame of second network.

The synchronous follow-up device of 27. mobile terminals according to claim 25, is characterized in that, described the second determining unit comprises:

The second frame number difference acquiring unit, for obtaining the target frame of second network and the second frame number difference of present frame;

Target frame number determining unit, determines the frame number of the target frame of second network for the frame number of the present frame based on described second network and described the second frame number difference.

The synchronous follow-up device of 28. mobile terminals according to claim 27, is characterized in that, described second network is GSM network, and described the second frame number difference acquiring unit comprises:

First-phase is to frame number acquiring unit, for the target frame of obtaining described second network at first-phase corresponding to GSM51 multi-frame to frame number;

Second-phase is to frame number computing unit, for the present frame that calculates described second network at second-phase corresponding to GSM51 multi-frame to frame number;

The second frame number difference computational unit, for calculate described first-phase to frame number and second-phase the difference to frame number, to obtain described the second frame number difference.

The synchronous follow-up device of 29. mobile terminals according to claim 25, it is characterized in that, described the 3rd determining unit, for calculating the skew with respect to the target frame of described first network of the expansion frame number of target frame of described first network and the target frame of described second network, formula is as follows:

T3=T1 ₁’+floor（（TD_len*12*Delta_GSM_sfn/13+offset_A ₁）/TD_len）

offset_B=(TD_len*12*Delta_GSM_sfn/13+offset_A ₁)%TD_len

30. 1 kinds of mobile terminals, is characterized in that, comprising: the synchronous follow-up device described in claim 15 to 29 any one.