CN102404761B - Maintaining of synchronization timing for TD (Time Division) and method and device for carrying out disparate system measurement - Google Patents
Maintaining of synchronization timing for TD (Time Division) and method and device for carrying out disparate system measurement Download PDFInfo
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- CN102404761B CN102404761B CN201010288063.3A CN201010288063A CN102404761B CN 102404761 B CN102404761 B CN 102404761B CN 201010288063 A CN201010288063 A CN 201010288063A CN 102404761 B CN102404761 B CN 102404761B
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Abstract
The invention discloses maintaining of synchronization timing for TD (Time Division) and a method and a device for carrying out disparate system measurement. A method for the maintaining of the synchronization timing comprises the following step of: in a TD mode or a GSM (Global System for Mobile Communication) mode, under the condition of carrying out mode conversion, finishing the maintaining of the synchronization timing for the TD according to obtained frame header deviation information of a TD cell relative to a current GSM cell and using the regulated frame header deviation information. The method for carrying out the disparate system measurement comprises the following steps of: receiving data from TD frequency points and ordering the frequency points by using the maintained synchronization timing for the TD; then, carrying out coarse synchronization and fine synchronization; and finally, finishing the measurement of disparate systems according to the obtained signal code power of each TD cell. Through the method and the device disclosed by the invention, the synchronization of the GSM cell to the TD system is realized, further, a terminal can use the maintained synchronization timing for the TD, the received data size is reduced, the accuracy for ordering the frequency points is increased, and the aim of increasing the accuracy of the measurement results for the disparate systems and lowering the processing load of the terminal is achieved.
Description
Technical field
The present invention relates to communication technical field, in particular, relate to a kind of TD synchronization timing and keep and carry out the method and apparatus of isosystem measurement based on it.
Background technology
In existing communication technical field, there is TDD (Time Division Duplex, time-division synchro system) with GSM (Global System for Mobile Communication, global system for mobile communications) dual-mode terminal, therefore in the process of communication, need different system (different system refers to the system of different structure) to measure, TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TDS-CDMA system) is a kind of in TDD system.
In gsm system, as shown in Figure 1, the frame of GSM is TDMA (Time Division Multiple Access, time division multiple access) to the frame structure of GSM, and the corresponding System Frame Number FN of every frame be take 2715648 (approximately 3.5 hours) as loop cycle numbering.Wherein, every frame duration is 60/13ms, comprises 8 time slots (TS0～7), and each slot length is 156.25bits, is about 0.577ms.
In TD-SCDMA system, as shown in Figure 2, TD-SCDMA subframe is divided into 7 conventional time slot TS and 3 special time slots that length is 675us to TD (abbreviation of TD-SCDMA) subframe structure.These 3 special time slots are respectively DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot), and in figure, S represents transfer point.
From frame structure and the TD subframe structure of GSM, known:
1GSM frame=60/13ms=5000qbits;
1TD subframe=65/13ms=6400chips;
Therefore, the frame of GSM and TD subframe are in the relation of time domain:
13GSM frame=12TD subframe.
In prior art, network issues parameter Qsearch_I by System Information2quarter or Measument Information and starts isosystem measurement.When GSM Serving cell signal strength scale reaches threshold parameter Qsearch_I, terminal triggers isosystem measurement; When GSM Serving cell signal strength scale does not reach threshold parameter Qsearch_I, terminal can stop isosystem measurement.Generally, refer to accompanying drawing 3 under GSM pattern, terminal is comprised of following steps the measurement of TD (different system):
Steps A: receive 1 sub-frame data of each TD adjacent area frequency, length is 6400chip, calculates the maximum average power of every frequency, then according to from large to small each frequency being sorted.
Step B: same shelves AGC (Automatic Gain Control, automatic gain control) receive 5 secondary data, each by calculated characteristics window ratio, find out Window position, Window ratio and P3 value (P3 is in Window, the performance number of middle 64chip).If 5 times are calculated, 5 positions are all close to, and Window ratio and meet certain thresholding, the thick synchronous success of judgement.Otherwise when unsuccessful, adjust AGC, carry out next grade of calculating, calculate at most 3 grades.If still unsuccessful, change frequency.Until terminal obtains a rough position of DwPTS.
Step C: essence is synchronous further to DwPTS, obtains chip level synchronization accuracy, and the SYNC_DL code of definite community.
Step D: in the 192chip data that comprise Midamble at the TD subframe time slot TS0 receiving, calculate the impulse response of each community Midamble data.After power transfer, obtain eat dishes without rice or wine in each TD-SCDMA cell signal code power, use this value for final isosystem measurement.
Due to, in the prior art, by network, issue after parameter Qsearch_I, by GSM Serving cell signal strength signal intensity by relatively deciding startup with Qsearch_I, stopping isosystem measurement.But, in measurement, obtain the frame head deviation information of relative GSM Serving cell, TD-SCDMA community, along with stopping of measuring, lose.Cell reselection occurring, switching on Hou Xin community, if restart measurement, need to again look for regularly; And blind looking in TD frame head process regularly, the data volume of reception is larger.Wherein, during the sequence of execution step A frequency, need to receive the data of each TD frequency 6400chips; And execution step B thick synchronous in, use the method for slide energy window to look for DWPTS, need to receive at most the data of 3*5* (6400+128) chips.
Therefore, while adopting prior art to carry out isosystem measurement to TDD/GSM dual-mode terminal, there is no the TD of priori regularly, under gsm service state, need to receive a large amount of data and process, not only having elongated the time of synchronously obtaining, increasing the weight of the processing load of terminal, also easily cause the deviation in processing procedure, cause the insecure problem of final measurement result.
Summary of the invention
In view of this, the invention provides a kind of TD synchronization timing keeps and carries out the method and apparatus of isosystem measurement based on it, solved the TD synchronous timing information that there is no priori in prior art when carrying out isosystem measurement, need to receive mass data processes, cause terminal processes load larger, easily cause the insecure problem of measurement result.
For achieving the above object, the invention provides following technical scheme:
A keeping method for TDS-CDMA system TD synchronization timing, is applied to, under GSM pattern, comprising:
Obtain TD system descending synchronization timing, according to default pattern switch condition, terminal is converted to GSM pattern from TD pattern;
In the situation that carrying out pattern conversion, according to the TD frame head position obtaining and the frame head position deviation of current GSM community, obtain the frame head deviation information of relatively current GSM community, TD community;
Determine the synchronous regime of current GSM community, according to the synchronous regime of described current GSM community and network, described frame head deviation information is adjusted;
Utilize the frame head deviation information after adjusting to complete the maintenance to TD synchronization timing.
Preferably, described default pattern switch condition is:
In terminal, under the IDLE of standby state, measure network signal, when TD signal strength signal intensity is less than GSM signal strength signal intensity, by reselection modes, present mode is converted to GSM pattern.
Preferably, described default pattern switch condition is:
Measuring terminals signal in the situation that of speech business or data service, when TD signal strength signal intensity is less than GSM signal strength signal intensity, or TD signal quality is while being worse than GSM signal quality, and the network switching command according to receiving, is converted to GSM pattern by present mode.
Preferably, the synchronous regime of described current GSM community and network is not when down-going synchronous GSM community completes down-going synchronous, or the GSM cell timing that has completed down-going synchronous is when adjust, and the process that described frame head deviation information is adjusted is specially:
Obtain GSM frame head lead and TD subframe frame length, and described GSM frame head lead and described frame head deviation information and value;
According to TD subframe frame length described in described and value integer mould, be adjusted the frame head deviation information of relatively current GSM community, Hou TD community.
A keeping method for TD synchronization timing, is applied to, under GSM pattern, comprising:
Obtain the frame head deviation information a of TD community relative GSM community A, according to default GSM cell switch condition, terminal CongGSM community A is converted to GSM community B;
In the situation that carrying out cell switch, according to described frame head deviation information a, and the frame head position deviation of obtaining A frame head position, GSM community YuGSM community B, obtain the frame head deviation information b of described TD community relative GSM community B;
Determine the synchronous regime of current GSM community B, according to the synchronous regime of described current GSM community B and network, described frame head deviation information b is adjusted;
Utilize the frame head deviation information b after adjusting to complete the maintenance to TD synchronization timing.
Preferably, described default GSM cell switch condition is current GSM community A while reselecting to GSM community B, or current GSM community A is while switching to GSM community B, and the process that described frame head deviation information b is adjusted is specially:
Obtain the GSM frame head lead of TD subframe frame length and described current GSM community A, and the difference of TD sub-frame frame and described GSM frame head lead;
According to described difference integer mould TD subframe frame length, be adjusted the frame head deviation information of Hou TD community relatively described GSM community B.
A holding device for TD synchronization timing, comprising:
Pattern modular converter, for obtaining TD system descending synchronization timing, is converted to GSM pattern by terminal from TD pattern according to default pattern switch condition;
GSM cell switch module, mainly comprises down-going synchronous timing unit, gravity treatment unit and switch unit:
Down-going synchronous timing unit, for obtaining the down-going synchronous timing of GSM community A;
Gravity treatment module, for reselecting to GSM community B by terminal from current GSM community A;
Switch unit, for switching to GSM community B by terminal from current GSM community A;
Timing acquisition module, mainly comprises the first timing acquisition unit and the second timing acquisition unit:
The first timing acquisition unit, in the situation that carrying out TD pattern conversion GSM pattern, TD frame head position and GSM frame head position deviation according to obtaining mode conversion moment point, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community;
The second timing acquisition unit, for terminal initial pattern, it is GSM pattern, on GSM community, realized in the situation of TD cell measurement, according to obtaining YuGSM community, the TD frame head position frame head position deviation of measuring moment point, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community;
Timing adjustment module, for adjusting lead and TD subframe frame length according to the described GSM frame head obtaining, adjusts described frame head deviation information;
Regularly keep module, for utilizing the frame head deviation information after adjustment to complete the maintenance to TD synchronization timing.
An inter-system measuring method for the TD/GSM dual-mode terminal of TD synchronization timing, comprising:
Described TD synchronization timing according to keeping, under current GSM community, calculates according to each TD adjacent area frequency the maximum average power of obtaining described each frequency is sorted in the data at time slot TS0 place;
Choosing frequency corresponding to maximum average power in the frequency of not attempting is target frequency, calculates descending receiving gain;
According to described descending receiving gain, obtain the data segment that comprises time slot TS0 and uplink and downlink pilot time slot place on target frequency, utilize slide energy window to determine the position of descending pilot frequency time slot;
Descending pilot frequency time slot and the TD synchronization timing of determining position are compared, when both deviations are in default range of receiving, carry out following steps:
According to the described descending pilot frequency time slot position of determining, it is carried out to essence synchronously, obtain symbol level synchronization accuracy, according to this symbol level synchronization accuracy, described TD synchronization timing is carried out to accurate adjustment whole, take and determine that descending receive channel code power Qiang community is TD benchmark community;
TD synchronization timing after synchronous according to essence, obtain the impulse response of the training sequence code of each frequency on described TD benchmark community and other TD communities, changing described impulse response is each TD cell signal code power through power, according to described signal code power, completes the measurement to each community of different system.
Preferably, descending pilot frequency time slot and the TD synchronization timing of determining position are compared, when both deviations are in default range of receiving, return and carry out that to choose frequency corresponding to maximum average power in the frequency of not attempting be target frequency, calculate this step of descending receiving gain.
An isosystem measurement device for the TD/GSM dual-mode terminal of TD synchronization timing, comprising:
Frequency order module, the described TD synchronization timing for according to keeping, under current GSM community, calculates according to each TD adjacent area frequency the maximum average power of obtaining described each frequency is sorted in the data at time slot TS0 place;
Gain calculation module, is target frequency for choosing frequency corresponding to frequency maximum average power of not attempting, and calculates descending receiving gain;
Thick synchronization module, for according to descending receiving gain, obtains the data segment that comprises time slot TS0 and uplink and downlink pilot time slot place on target frequency, utilizes slide energy window to determine the position of descending pilot frequency time slot, and itself and the TD synchronization timing keeping are compared;
Essence synchronization module, for the described descending pilot frequency time slot position according to determining, it is carried out to essence synchronously, obtain symbol level synchronization accuracy, according to this symbol level synchronization accuracy, described TD synchronization timing is carried out to accurate adjustment whole, take and determine that descending receive channel code power Qiang community is TD benchmark community;
Cell signal code power computation module, for the TD synchronization timing after synchronous according to essence, obtain the impulse response of the training sequence code of each frequency on described TD benchmark community and other TD communities, changing described impulse response is each TD cell signal code power through power, according to described signal code power, completes the measurement to each community of different system.
Known via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of TD synchronization timing and keep and carry out the method and apparatus of isosystem measurement based on it, the present invention is applied to the dual-mode terminal of TDD time-division synchro system and gsm system.By method disclosed by the invention, the architectural feature based on GSM and TD frame, when the pattern of terminal is switched, obtains the frame head deviation of YuTD community, GSM community; Then in switch cell synchronous adjustment, cell reselection or community, this frame head deviation is calculated to conversion, the synchronization timing of realizing the relative TD system in GSM community keeps; Then, when carrying out measuring between different system, use the TD synchronization timing keeping, the data that directly receive TD frequency are carried out frequency sequence and thick synchronous; After precise synchronization, then carry out the measurement of TS0 data receiver and the descending receive channel code of the RSCP power of TD frequency, obtain each TD cell signal code power, according to this signal code power, complete the measurement to different system.
By method disclosed by the invention, solved the TD synchronous timing information that there is no priori when different system is measured in prior art, need to receive mass data processes, cause terminal processes load larger, easily cause the insecure problem of measurement result, realized synchronous to TD system of current GSM community, and when needs are measured different system, terminal can be utilized the TD synchronization timing of maintenance, when reducing reception data volume, improve the accuracy of frequency sequence, and can complete fast the measurement to different system, reach the accuracy of the measurement result that improves different system and the object of reduction terminal processes load simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is GSM time division multiple access tdma frame structural representation;
Fig. 2 is TD-SCDMA subframe structure schematic diagram;
Fig. 3 be in prior art under GSM pattern, the flow chart that terminal is measured different system;
Fig. 4 is the method flow diagram a that the disclosed a kind of TD synchronization timing of the embodiment of the present invention one keeps;
Fig. 5 is the method flow diagram b that the disclosed a kind of TD synchronization timing of the embodiment of the present invention one keeps;
Fig. 6 is the frame sequential relationship schematic diagram of TD and GSM;
Tu7Wei GSM community frame head timing adjustment schematic diagram;
Fig. 8 is the synchronous frame head timing adjustment of GSM cell downlink;
Fig. 9 is the method flow diagram c that the disclosed a kind of TD synchronization timing of the embodiment of the present invention two keeps;
Figure 10 is the method flow diagram d that the disclosed a kind of TD synchronization timing of the embodiment of the present invention two keeps;
Figure 11 is the gravity treatment of GSM Serving cell or the frame head timing relationship schematic diagram that is switched to other adjacent areas;
Figure 12 is the apparatus structure schematic diagram that a kind of TD synchronization timing disclosed by the invention keeps;
Figure 13 is a kind of method of measurement that keeps carrying out TD/GSM different systems of dual-mode terminal based on TD synchronization timing disclosed by the invention;
Figure 14 is the time slot frame structure schematic diagram of TS0, DwPTS and UpPTS;
Figure 15 is a kind of measurement mechanism that keeps carrying out TD/GSM different systems of dual-mode terminal based on TD synchronization timing disclosed by the invention.
Embodiment
For quote and know for the purpose of, the explanation of the technical term hereinafter using, write a Chinese character in simplified form or abridge and be summarized as follows:
TDD system: Time Division Duplex, time-division synchro system;
TDMA:Time Division Multiple Access, time division multiple access;
TD-SCDMA system: Time Division-Synchronous Code Division Multiple Access, TDS-CDMA system;
TD: be the abbreviation of TD-SCDMA;
TD-LTE system: Time Division-Long Term Evolution, long evolving system;
IDLE: refer to the idle mode of terminal, i.e. terminal standby state;
Handover: switch translative mode when referring to do business;
Cell reselection: gravity treatment, translative mode when referring to not do business;
AGC: descending receiving gain;
Midamble: training sequence;
RSSI:Received Signal Strength Indication, represents the signal strength signal intensity indication (average power) of reception, and the optional part for wireless transmission layer, is used for judging link quality, and whether increases broadcast transmission intensity;
RSCP: descending receive channel code power;
DwPTS: uplink pilot time slot;
UpPTS: descending pilot frequency time slot;
SYNC_DL: for indicating the code of community;
Chip: code element (representation unit level).
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of TD synchronization timing keeps and carries out the method and apparatus of isosystem measurement based on it, utilization is under GSM pattern or the TD synchronization timing keeping under TD pattern, realize the measurement of the different system of TD/GSM dual-mode terminal under GSM pattern, for method disclosed by the invention, also can be applied to the dual-mode terminal of TDD system and gsm system, be applicable to extensively commercial TD/GSM dual-mode terminal, be also applicable to TD-LTE/GSM dual-mode terminal.
The method keeping about a kind of TD synchronization timing disclosed by the invention, refers to accompanying drawing 4 and accompanying drawing 5, under GSM pattern, when being converted to GSM pattern from TD pattern, utilizing this method to realize TD synchronization timing and keeps mainly comprising the following steps:
Step S101, obtains TD system descending synchronization timing, according to default pattern switch condition, terminal is converted to GSM pattern from TD pattern.
Terminal under TD pattern normal resident after, execution step S101, first obtain the down-going synchronous of TD system regularly, then, according to default pattern switch condition, terminal is converted to GSM pattern from TD pattern, wherein, the mode of the pattern of terminal being changed according to default pattern switch condition generally has two kinds: one again, handover switching mode, translative mode while referring to that terminal is done business; Cell reselection reselection modes, translative mode while referring to that terminal is not done business.Therefore, in step S101, mainly comprise the following steps:
Step S1011 measures network signal in terminal under the IDLE of standby state, when TD signal strength signal intensity is less than GSM signal strength signal intensity, by reselection modes, present mode is converted to GSM pattern.
When terminal is under IDLE standby, in the situation that not doing business, terminal carries out gravity treatment.
Execution step S1011 measures network signal, and judges via terminal, measure TD signal a little less than, when GSM signal is stronger, terminal, by the mode of gravity treatment, is converted to GSM pattern by the present mode at terminal place.
Step S1012, measuring terminals signal in the situation that doing business, when TD signal strength signal intensity is less than GSM signal strength signal intensity, or TD signal quality is while being less than GSM signal quality, and the network switching command according to receiving, is converted to GSM pattern by the pattern of terminal.
In step S1012, the business here refers to speech business or the data service of terminal, and still, the present invention is not limited in this about the explanation of business.
In the situation that doing business, carry out and switch, by execution step S1012, measuring terminals signal, by network, judged, in TD signal strength signal intensity, be less than GSM signal strength signal intensity, or TD signal quality is less than in the situation of GSM signal quality, trigger network sends switching command, makes the pattern of terminal be converted to GSM pattern.
Wherein, the decision condition carrying out via network is not only signal strength signal intensity or signal quality, can also be network capacity etc., and the present invention is not limited to this, as long as meet 3A reported event.
Wherein, 3A reported event refers to different system handover measurement event, is specially: current frequency of utilization quality is lower than an absolute thresholding, and GSM cell quality is higher than another absolute door limit value.
It should be noted that, in terminal, under IDLE standby, also can not consider the situation of GSM network, by receiving user's selection instruction voluntarily, the pattern of terminal is converted to GSM pattern.
Step S102, in the situation that carrying out pattern conversion, according to the TD frame head position obtaining and the frame head position deviation of current GSM community, obtains the frame head deviation information of relatively current GSM community, TD community.
When execution step S101, for different pattern switch conditions, the pattern of terminal is changed, in the situation that changing, pattern performs step S102.For clearer statement execution step S102, obtain the process of the frame head deviation information of relatively current GSM community, TD community, illustrate here:
As shown in Figure 6, wherein, TD_FN (x) is TD cell-of-origin frame number; GSM_FN (x) is the frame number of GSM Target cell; Δ=5/13ms; GSM_FRAME is GSM frame length, has following relation:
GSM_FRAME=60/13ms=5000qbits=12 Δ, about 5908chips (1) TD_FRAME, for TD subframe is long, has following relation:
TD_FRAME=5ms=6400chips=13 Δ, about 5417qbits (2)
Emergence pattern conversion during TD_FN (m) frame of TD community, the frame number of GSM Target cell is GSM_FN (n).Now, TD frame head is front, and itself and GSM frame head deviation are TDD_offset.With δ (n), record the now frame head deviation information of the relative GSM in TD community community, the following formula for relation (3) of parameters and δ (n) represents:
δ(n)＝TD_FRAME-TD_offset，0＜＝δ(n)＜TD_FRAME (3)
，Dang GSM community (in Fig. 6, corresponding TD has crossed M frame) after having crossed N GSM frame so, frame head is now δ (n+N) expression for deviation information, shown in (4) and formula (5):
δ(n+N)＝(δ(n)+N％13×Δ)％TD_FRAME (4)
δ(n+N)＝(TD_FRAME-TD_offset+N％13×Δ)％TD_FRAME (5)
In formula (4) and formula (5), 0 <=TD_offset < GSM_FRAME.
Wherein, suc as formula the δ (n+N) shown in (4), be the TD synchronizing information that will keep under GSM pattern, as long as it is for measuring the prior information of TD as GSM.At execution step S101, carry out pattern when conversion, general when terminal is done business or the mode adopting while not doing business the same; And when user carries out pattern conversion voluntarily, now, after TDD_offset=0 ，GSM community needs first to carry out down-going synchronous with network, then carry out frame head timing and frame number adjustment.
Step S103, determines the synchronous regime of current GSM community, according to the synchronous regime of described current GSM community and network, described frame head deviation information is adjusted.
Step S104, utilizes the frame head deviation information after adjusting to complete the maintenance to TD synchronization timing.
Suc as formula the frame head deviation information of relative GSM community, TD community shown in (3), need to carry out constantly adjusting and could keeping according to the synchronous regime of current GSM community and network, otherwise will soon be invalid.Therefore perform step S103 and step S104, to complete the maintenance to TD synchronization timing.
It should be noted that, the different adjustment to TD synchronization timing from the synchronous regime of network according to current GSM community in execution step S103, mainly comprise the following steps:
Step S1031, obtains GSM frame head lead and TD subframe frame length, and described GSM frame head lead and described frame head deviation information and value.
Step S1032, according to TD subframe frame length described in described and value integer mould, is adjusted the frame head deviation information of relatively current GSM community, Hou TD community.
Due to, different according to the synchronous regime of current GSM community and network, concrete implementation again can be different, for making foregoing description clearer, illustrates here.When completing the GSM cell timing adjustment of down-going synchronous, when there is frame head timing adjustment in down-going synchronous Guo GSM community, (in figure, each sign is consistent with the explanation in Fig. 6) as shown in Figure 7:
When carrying out TDYu GSM community frame head timing adjustment, the frame head of GSM_FN (n+N) advances to B point from A point, and lead is GSM_offset.Now, TD synchronization timing keeps using following formula (6) to represent:
δ(n+N)＝[δ(n+N)+GSM_offset)]％TD_FRAME (6)
Wherein, 0 <=GSM_offset < GSM_FRAME.
When down-going synchronous GSM community does not complete down-going synchronous, i.e. the synchronous frame head timing adjustment of GSM cell downlink, carry out said process and specifically represent, (in figure, each sign is consistent with the explanation in Fig. 6) as shown in Figure 8:
When down-going synchronous GSM community does not complete down-going synchronous, the frame head of GSM_FN (n+N) advances to B point from A point, and lead is GSM_offset; Frame number has become FN from n+N simultaneously.Now, TD synchronization timing keeps using following formula (7) to represent:
δ(FN)＝[δ(n+N)+GSM_offset)]％TD_FRAME (7)
Wherein, 0 <=GSM_offset < GSM_FRAME.
It should be noted that, " % " occurring in the formula of mentioning in specification of the present invention represents to round digital-to-analogue.
Equally, in the time of under GSM pattern, when from old GSM cell switch Zhi Xin GSM community, the present invention's method that also disclosed a kind of TD synchronization timing keeps, refers to accompanying drawing 9, realizes TD synchronization timing and keeps mainly comprising the following steps:
Step S201, obtains the frame head deviation information a of TD community relative GSM community A, according to default GSM cell switch condition, terminal CongGSM community A is converted to GSM community B.
It at step S201 Zhong， GSM community A, is the adjacent area of ，GSM community, the current area B WeiGSM community A at terminal place.Default GSM cell switch condition mainly contains two kinds, and the corresponding mode of carrying out is: one, when terminal is done business, switches to GSM community B by terminal from current GSM community A; Its two, when terminal is not done business, terminal is reselected to GSM community B from current GSM community A.
Therefore, according to different switching condition, at step S201, comprise:
Step S2011, obtains the frame head deviation information a of TD community relative GSM community A, and terminal is switched to GSM community B from current GSM community A.
Step S2012, obtains the frame head deviation information a of TD community relative GSM community A, and terminal is reselected to GSM community B from current GSM community A.
Step S202, in the situation that carrying out cell switch, according to described frame head deviation information a, and the frame head position deviation of obtaining A frame head position, GSM community YuGSM community B, obtains the frame head deviation information b of described TD community relative GSM community B.
Under GSM pattern, according to existing default GSM cell switch condition, terminal CongGSM community A is converted to GSM community B, in the process of conversion, the relative synchronizing information of the relatively current GSM of TD system community (GSM community B) is obtained in the TD measurement having stopped of Cong Jiu GSM community (GSM community A), according to the frame head deviation information a that obtains TD community relative GSM community A, obtain the frame head deviation information b of GaiTD community relative GSM community B.
Step S203, determines the synchronous regime of current GSM community B, according to the synchronous regime of described current GSM community B and network, described frame head deviation information b is adjusted.
Step S204 utilizes the frame head deviation information b after adjusting to complete the maintenance to TD synchronization timing.
Identical with above-described embodiment one, need to carry out constantly adjusting and could keeping according to current GSM community B and the frame head deviation information b of the synchronous regime ，Dui TD community relative GSM community B of network, otherwise will soon be invalid.Therefore, execution step S203 and step S204, to complete the maintenance to TD synchronization timing.
It should be noted that, in execution step S203, these two kinds of different conditions during being mainly included in the A gravity treatment of GSM community or switching to GSM community B of the synchronous regime of current GSM community and network, no matter Shi GSM community A reselects to GSM community B, or GSM community A switches to GSM community B, in step S203, mainly comprise the following steps:
Step S2031, obtains the GSM frame head lead of TD subframe frame length and described current GSM community A and the difference of TD sub-frame frame and described GSM frame head lead.
Step S2032, according to described difference integer mould TD subframe frame length, is adjusted the frame head deviation information b of Hou TD community relatively described GSM community B.
For making the description of above-mentioned steps S2031 and step S2032 clearer, illustrate here.(in figure, each sign is consistent with the explanation in Fig. 6) for example, as shown in figure 11:
Wherein, said GSM community A is that current ，GSM community, GSM Serving cell B is any one in other adjacent areas.GSM community A gravity treatment or while switching to GSM community B, as shown in figure 11 ，Cong community SCELL gravity treatment or be switched to NCELL.Now, TD synchronization timing keeps using following formula (8) to represent:
NCELL_δ(m+1)＝[δ(n+1)+TD_FRAME-GSM_offset)]％TD_FRAME (8)
Wherein, 0 <=GSM_offset < GSM_FRAME.
By the disclosed method of the invention described above embodiment, under different pattern (TD pattern or GSM pattern), the relative synchronizing information that can multi-source obtains the relative GSM of TD system community, and the various states that can occur for each pattern XiaGSM community, utilize corresponding mode to complete the maintenance of TD synchronization timing.
In the disclosed embodiment of the invention described above, describe a kind of method that TD synchronization timing keeps in detail, for method of the present invention, can adopt the device of various ways to realize, therefore the invention also discloses the device that a kind of TD synchronization timing keeps, provide specific embodiment below and be elaborated.
Refer to accompanying drawing 12, in the device that a kind of TD synchronization timing disclosed by the invention keeps, mainly comprise pattern modular converter 301, GSM cell switch module 302, timing acquisition module 303, timing adjustment module 304 and regularly keep module 305.
Pattern modular converter 301, for obtaining TD system descending synchronization timing, is converted to GSM pattern by terminal from TD pattern according to default pattern switch condition.
GSM cell switch module 302, mainly comprises down-going synchronous timing unit 3021, gravity treatment unit 3022 and switch unit 3023 in this module.
Wherein, down-going synchronous timing unit 3021, for obtaining the down-going synchronous timing of GSM community A.
Timing acquisition module 303, mainly comprises the first timing acquisition unit 3031 and the second timing acquisition unit 3032 in this module.
Wherein, the first timing acquisition unit 3031, for in the situation that carrying out TD pattern conversion GSM pattern, TD frame head position and GSM frame head position deviation according to obtaining mode conversion moment point, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community.
The second timing acquisition unit 3032, for terminal initial pattern, it is GSM pattern, on the A of GSM community, realized in the situation of TD cell measurement, according to obtaining YuGSM community, the TD frame head position A frame head position deviation of measuring moment point, obtain the frame head deviation information that TD community relatively current GSM community B puts at any one time.
It should be noted that, the frame head deviation information getting in timing acquisition unit 303 is not fixing constant, but along with current GSM community frame number changes, specifically changes referring to the functional relation in above-mentioned formula (3), and correspondence for example.
Regularly keep module 305, for utilizing the frame head deviation information after adjustment to complete the maintenance to TD synchronization timing.
The disclosed device of the invention described above, when being converted to GSM pattern from TD pattern: first, by pattern modular converter 301, obtain TD system descending synchronization timing, and execution pattern conversion, terminal is converted to GSM pattern from TD pattern; Then, then enter in the first timing acquisition unit 3031 in timing acquisition module 303, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community; Then, then enter in timing adjustment module 304, this frame head deviation information is adjusted; Finally, enter regularly and keep in module 305, utilize the frame head deviation information after adjusting to realize the maintenance to TD synchronization timing.
When from old GSM cell switch Zhi Xin GSM community: first, in GSM cell switch module 302, obtain the down-going synchronous of GSM community A regularly, if terminal is not done business, reselecting in the B of GSM community terminal CongGSM community A in gravity treatment unit 3022, if terminal is being done business, at switch unit 3023, terminal CongGSM community A is switched to GSM community B; Then, then enter in the second timing acquisition unit 3032 in timing acquisition module 303, obtain the frame head deviation information that TD community relatively current GSM community B puts at any one time; Then, then enter in timing adjustment module 304, this frame head deviation information is adjusted; Finally, enter regularly and keep in module 305, utilize the frame head deviation information after adjusting to realize the maintenance to TD synchronization timing.
Therefore, utilize said apparatus disclosed by the invention, can be when being converted to GSM pattern from TD pattern, or during from old GSM cell switch Zhi Xin GSM community, complete the maintenance to TD synchronization timing.Meanwhile, can also guarantee the relative synchronizing information of the relative GSM of the TD system of the obtaining community of multi-source, for example, from terminal pattern conversion (gravity treatment or switching), obtain the relative synchronizing information of the relative GSM of TD system community; The different system (TD) having stopped of Cong Jiu GSM community is measured the relative synchronizing information that obtains the relatively current GSM of TD system community.
And, the maintenance that solves the TD synchronization timing of GSM community under various states under different mode.For example, TD synchronizing information when, resident (down-going synchronous) GSM cell timing is adjusted keeps; Not resident GSM community is completed to down-going synchronous and TD synchronizing information when resident keeps; TD synchronizing information to GSM from old cell reselection, while being switched to new community keeps.
In the disclosed embodiment of the invention described above, describe the method and apparatus that a kind of TD synchronization timing keeps in detail, simultaneously, the invention also discloses a kind of inter-system measuring method that keeps carrying out TD/GSM dual-mode terminal based on TD synchronization timing, provide specific embodiment below and be elaborated.
Refer to accompanying drawing 13, mainly comprise the following steps:
Step S401, the described TD synchronization timing according to keeping, under current GSM community, calculates according to each TD adjacent area frequency the maximum average power of obtaining described each frequency is sorted in the data at time slot TS0 place.
When execution step S401, the TD synchronous timing information δ (GSM_FN (x)) that adopts the disclosed method of the invention described above to keep calculates TD frame head position on the GSM of current area frame; Then, each TD adjacent area frequency receives near the data of TS0 Midamble according to fixing AGC.Be illustrated in fig. 14 shown below, at Midamble, receive forward 16chips more, backward the 32chips that receive, altogether 192chips data more.Compare with the TD synchronization timing that in prior art, use keeps, the downlink broadcast data that do not need all to receive TS0 and DwPTS, can prevent the drift of synchronizing information, prevent unwanted data, as the business datum of TS1 and TS6 receives into, thereby cause the RSSI of calculating inaccurate.
Therefore,, when execution step S401, utilize the TD synchronous timing information keeping, can receive whole TD frame data, and receive only the downlink broadcast data of TS0, and and can get rid of the interference of uplink and downlink business, reducing the accuracy that has improved RSSI sequence when receiving data volume.Utilize each frequency to calculate respectively the RSSI value under eating dishes without rice or wine, by weak, frequency being sorted by force.Correspondingly, each frequency accurately RSSI calculates, and also realized its downlink broadcast receiving gain AGC and adjusted, and then in can selecting to eat dishes without rice or wine, the strongest frequency is done subsequent synchronisation, improves accuracy.
Step S402, choosing frequency corresponding to maximum average power in the frequency of not attempting is target frequency, calculates descending receiving gain.
When execution step S402, according to the RSSI value of each frequency, in the frequency of never attempting, choose the maximum frequency of RSSI value as target frequency, calculate descending receiving gain AGC.
Step S403, according to described descending receiving gain, obtains the data segment that comprises time slot TS0 and DwPTS, UpPTS on target frequency, utilizes slide energy window to determine the position of DwPTS.
When execution step S403, be to carry out thick synchronous process in fact, the AGC to regulate that utilizes execution step S402 to obtain, receives the one section of 1216chips data (referring to accompanying drawing 14) that are comprised of TS0, DwPTS and UpPTS on frequency; Then, by slide energy window, calculate the position at DwPTS place.In carrying out this step, with the AGC that is directly transferred to position, receive data and do synchronously, reduce and carry out the adjustment of many grades of AGC, thereby significantly reduced the data volume receiving.
Step S404, compares DwPTS and the TD synchronization timing of determining position, and whether the deviation that judges both in presetting range of receiving, if so, performs step S405; If not, return to execution step S402.
By definite DwPTS of position and the TD synchronization timing of maintenance are compared, if deviation is in range of receiving, successful, then perform step S405 and carry out essence synchronously; Otherwise failure, returns to execution step S402 and again attempts obtaining time strong frequency, re-starts above-mentioned processing.Generally, the range of receiving of the permission of deviation is at least less than 336chip.But, as long as in above-mentioned execution frequency sequence, do not use business datum, not causing the inaccurate of RSSI value, the permission range of receiving of deviation is not limited in this.
It should be noted that, when repeatedly performing step S402, if Top is N (as N=3), frequency has been attempted all and has not successfully been obtained AGC, proceeds in different system (TD) measurement procedure of existing routine.
Step S405, step is carried out essence synchronously according to the described descending pilot frequency time slot position of determining to it, obtain symbol level synchronization accuracy, according to this symbol level synchronization accuracy, described TD synchronization timing is carried out to accurate adjustment whole, take and determine that descending receive channel code power Qiang community is TD benchmark community.
When execution step S405, utilize the DwPTS positional information of above-mentioned thick synchronization gain, in the 1216chips data that receive, the 128chip data that taking-up comprises DwPTS, by algorithm and SYNC_DL code, carry out related calculation, determine the SYNC_DL code of community, finally obtain chip level synchronization accuracy TD synchronization timing is carried out to essence synchronously.
Therefore, use high-precision TD synchronous timing information, receive the DwPTS data of residue frequency, be respectively SYNC_DL relevant; Then, get RSCP Qiang community, be set as TD benchmark community, the OTD value with benchmark community is preserved in other community, and this value is in the time of final measurement RSCP, and fine setting receives the deviation of data, improves measurement accuracy.
Step S406, TD synchronization timing after synchronous according to essence, obtain the impulse response of the Midamble of each frequency on described TD benchmark community and other TD communities, changing described impulse response is each TD cell signal code power through power, according to described signal code power, completes the measurement to each community of different system.
When execution step S406, within regularly can reaching 4chips through the synchronous TD of essence, the impulse response that regularly receives near the 192chip data Midamble of each frequency by this, then converts the signal code power of each corresponding TD community to by calculating the impulse response obtaining by corresponding calculating; Finally according to this signal code power, complete fast the measurement to different system adjacent area, complete the measurement to each community of different system of TD/GSM dual-mode terminal.
By the present invention is based on the TD of maintenance, regularly completing the measurement of the different system of TD/GSM dual-mode terminal, is mainly because in TD/GSM dual-mode terminal, and what substantially arrange is all the start of TD pattern, preferentially attempts TD community resident.A little less than only having TD signal, while having met terminal gravity treatment or business switching condition, just can be toward the conversion of GSM pattern.Therefore, utilize the frame head deviation information of keeping TDYuan community and GSM Target cell in pattern conversion constantly, can be used as the prior information that GSM measures TD, complete the measurement of each community of different system of TD/GSM dual-mode terminal.
If under GSM pattern, before network issues isosystem measurement parameter Qsearch_I, or meet not measure before thresholding when Serving cell signal strength signal intensity, utilize the TD synchronization timing terminal keeping to realize synchronous to TD system of current GSM community.Therefore, when different system is measured, not only reduced the reception to unnecessary data, reduced the reception of data volume, and when reducing reception data volume, improve the accuracy of frequency sequence, reach the accuracy of the measurement result that improves different system and the object of reduction terminal processes load.
In the disclosed embodiment of the invention described above, describe a kind of method of measurement that keeps carrying out the different system of TD/GSM dual-mode terminal based on TD synchronization timing in detail, for method of the present invention, can adopt the device of various ways to realize, therefore the invention also discloses a kind of measurement mechanism that keeps carrying out the different system of TD/GSM dual-mode terminal based on TD synchronization timing, provide specific embodiment below and be elaborated.
Refer to accompanying drawing 15, mainly comprise: frequency order module 501, gain calculation module 502, thick synchronization module 503, smart synchronization module 504 and cell signal code power computation module 505.
Cell signal code power computation module 505, for the TD synchronization timing after synchronous according to essence, obtain the impulse response of the training sequence code of each frequency on described TD benchmark community and other TD communities, changing described impulse response is each TD cell signal code power through power, according to described signal code power, completes the measurement to each community of different system.
In said apparatus disclosed by the invention, the TD synchronization timing utilize keeping when carrying out measuring between different system, is used the TD synchronization timing keeping in frequency order module 501, and the data that directly receive TD frequency are carried out frequency sequence; Then pass through thick synchronization module 503 and smart synchronization module 504; Finally, in cell signal code power computation module 505, carry out the measurement of TS0 data receiver and the descending receive channel code of the RSCP power of TD frequency, obtain each TD cell signal code power, according to this signal code power, complete fast the measurement to different system.
In sum:
By method and apparatus disclosed by the invention, solved the TD synchronous timing information that there is no priori when different system is measured in prior art, need to receive mass data and process, cause terminal processes load larger, easily cause the insecure problem of measurement result.Realized synchronous to TD system of current GSM community, and when needs are measured different system, terminal can be utilized the TD synchronization timing of maintenance, receive less data volume, and improve the accuracy that frequency sorts when reducing reception data volume, and can complete fast the measurement to different system, reach the accuracy of the measurement result that improves different system and the object of reduction terminal processes load.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates referring to method.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a keeping method for TDS-CDMA system TD synchronization timing, is applied to, under GSM pattern, it is characterized in that, comprising:
Obtain TD system descending synchronization timing, according to default pattern switch condition, terminal is converted to GSM pattern from TD pattern;
In the situation that carrying out pattern conversion, according to the TD frame head position obtaining and the frame head position deviation of current GSM community, obtain the frame head deviation information of relatively current GSM community, TD community;
Determine the synchronous regime of current GSM community, according to the synchronous regime of described current GSM community and network, described frame head deviation information is adjusted;
Utilize the frame head deviation information after adjusting to complete the maintenance to TD synchronization timing.
2. method according to claim 1, is characterized in that, described default pattern switch condition is:
In terminal, under the IDLE of standby state, measure network signal, when TD signal strength signal intensity is less than GSM signal strength signal intensity, by reselection modes, present mode is converted to GSM pattern.
3. method according to claim 1, is characterized in that, described default pattern switch condition is:
Measuring terminals signal in the situation that of speech business or data service, when TD signal strength signal intensity is less than GSM signal strength signal intensity, or TD signal quality is while being worse than GSM signal quality, and the network switching command according to receiving, is converted to GSM pattern by present mode.
4. method according to claim 1, it is characterized in that, the synchronous regime of described current GSM community and network is not when down-going synchronous GSM community completes down-going synchronous, or the GSM cell timing that has completed down-going synchronous is when adjust, the process that described frame head deviation information is adjusted is specially:
Obtain GSM frame head lead and TD subframe frame length, and described GSM frame head lead and described frame head deviation information and value;
According to TD subframe frame length described in described and value integer mould, be adjusted the frame head deviation information of relatively current GSM community, Hou TD community.
5. a keeping method for TD synchronization timing, is applied to, under GSM pattern, it is characterized in that, comprising:
Obtain the frame head deviation information a of TD community relative GSM community A, according to default GSM cell switch condition, terminal CongGSM community A is converted to GSM community B;
In the situation that carrying out cell switch, according to described frame head deviation information a, and the frame head position deviation of obtaining A frame head position, GSM community YuGSM community B, obtain the frame head deviation information b of described TD community relative GSM community B;
Determine the synchronous regime of current GSM community B, according to the synchronous regime of described current GSM community B and network, described frame head deviation information b is adjusted;
Utilize the frame head deviation information b after adjusting to complete the maintenance to TD synchronization timing.
6. method according to claim 5, it is characterized in that, described default GSM cell switch condition is current GSM community A while reselecting to GSM community B, or current GSM community A is while switching to GSM community B, and the process that described frame head deviation information b is adjusted is specially:
Obtain the GSM frame head lead of TD subframe frame length and described current GSM community A, and the difference of TD subframe frame length and described GSM frame head lead;
According to described difference integer mould TD subframe frame length, be adjusted the frame head deviation information of Hou TD community relatively described GSM community B.
7. a holding device for TD synchronization timing, is characterized in that, comprising:
Pattern modular converter, for obtaining TD system descending synchronization timing, is converted to GSM pattern by terminal from TD pattern according to default pattern switch condition;
GSM cell switch module, mainly comprises down-going synchronous timing unit, gravity treatment unit and switch unit:
Down-going synchronous timing unit, for obtaining the down-going synchronous timing of GSM community A;
Gravity treatment module, for reselecting to GSM community B by terminal from current GSM community A;
Switch unit, for switching to GSM community B by terminal from current GSM community A;
Timing acquisition module, mainly comprises the first timing acquisition unit and the second timing acquisition unit:
The first timing acquisition unit, in the situation that carrying out TD pattern conversion GSM pattern, TD frame head position and GSM frame head position deviation according to obtaining mode conversion moment point, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community;
The second timing acquisition unit, for terminal initial pattern, it is GSM pattern, on GSM community, realized in the situation of TD cell measurement, according to obtaining YuGSM community, the TD frame head position frame head position deviation of measuring moment point, obtain the frame head deviation information that put at any one time relatively current GSM community, TD community;
Timing adjustment module, for adjusting lead and TD subframe frame length according to the current GSM frame head obtaining, adjusts described frame head deviation information;
Regularly keep module, for utilizing the frame head deviation information after adjustment to complete the maintenance to TD synchronization timing.
8. an inter-system measuring method for the TD/GSM dual-mode terminal based on TD synchronization timing, is characterized in that, comprising:
Described TD synchronization timing according to keeping, under current GSM community, calculates according to each TD adjacent area frequency the maximum average power of obtaining described each frequency is sorted in the data at time slot TS0 place;
Choosing frequency corresponding to maximum average power in the frequency of not attempting is target frequency, calculates descending receiving gain;
According to described descending receiving gain, obtain the data segment that comprises time slot TS0 and uplink and downlink pilot time slot place on target frequency, utilize slide energy window to determine the position of descending pilot frequency time slot;
Descending pilot frequency time slot and the TD synchronization timing of determining position are compared, when both deviations are in default range of receiving, carry out following steps:
According to the described descending pilot frequency time slot position of determining, it is carried out to essence synchronously, obtain symbol level synchronization accuracy, according to this symbol level synchronization accuracy, described TD synchronization timing is carried out to accurate adjustment whole, take and determine that descending receive channel code power Qiang community is TD benchmark community;
TD synchronization timing after synchronous according to essence, obtain the impulse response of the training sequence code of each frequency on described TD benchmark community and other TD communities, change described impulse response for each TD cell signal code power, according to described signal code power, complete the measurement to each community of different system.
9. method according to claim 8, it is characterized in that, descending pilot frequency time slot and the TD synchronization timing of determining position are compared, when both deviations are not in default range of receiving, return and carry out that to choose frequency corresponding to maximum average power in the frequency of not attempting be target frequency, calculate this step of descending receiving gain.
10. an isosystem measurement device for the TD/GSM dual-mode terminal based on TD synchronization timing, is characterized in that, comprising:
Frequency order module, the described TD synchronization timing for according to keeping, under current GSM community, calculates according to each TD adjacent area frequency the maximum average power of obtaining described each frequency is sorted in the data at time slot TS0 place;
Gain calculation module, is target frequency for choosing frequency corresponding to frequency maximum average power of not attempting, and calculates descending receiving gain;
Thick synchronization module, for according to descending receiving gain, obtains the data segment that comprises time slot TS0 and uplink and downlink pilot time slot place on target frequency, utilizes slide energy window to determine the position of descending pilot frequency time slot, and itself and the TD synchronization timing keeping are compared;
Essence synchronization module, for the described descending pilot frequency time slot position according to determining, it is carried out to essence synchronously, obtain symbol level synchronization accuracy, according to this symbol level synchronization accuracy, described TD synchronization timing is carried out to accurate adjustment whole, take and determine that descending receive channel code power Qiang community is TD benchmark community;
Cell signal code power computation module, for the TD synchronization timing after synchronous according to essence, obtain the impulse response of the training sequence code of each frequency on described TD benchmark community and other TD communities, change described impulse response for each TD cell signal code power, according to described signal code power, complete the measurement to each community of different system.
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| WO2017059435A1 (en) | 2015-10-03 | 2017-04-06 | Adc Telecommunications, Inc. | Tdd timing recovery in a distributed antenna system |
| CN110167058B (en) * | 2019-05-14 | 2023-02-21 | 广州三星通信技术研究有限公司 | Interference frequency identification method, mobile terminal, log management method and server |
| CN111818597B (en) * | 2020-06-16 | 2022-06-10 | 深圳磊诺科技有限公司 | LTE micro base station and cell parameter switching method thereof |
| CN116828586B (en) * | 2023-08-30 | 2023-11-14 | 芯迈微半导体(上海)有限公司 | Synchronization method and device for terminal in standby state |
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