CN1764087A - Synchronous method for time-division duplex mobile communication system terminal working on subcarrier wave - Google Patents
Synchronous method for time-division duplex mobile communication system terminal working on subcarrier wave Download PDFInfo
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- CN1764087A CN1764087A CN 200410086531 CN200410086531A CN1764087A CN 1764087 A CN1764087 A CN 1764087A CN 200410086531 CN200410086531 CN 200410086531 CN 200410086531 A CN200410086531 A CN 200410086531A CN 1764087 A CN1764087 A CN 1764087A
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Abstract
The invention relates to a synchronization method for terminal on subcarrier in time-division duplex mobile communication system. Wherein, sending data block for synchronization in main carrier wave instead of subcarrier; switching frequency to main carrier by the terminal on subcarrier during TSO time slot or down synchronization time slot, using the TS0 midamble or down-synchronization Dwpts signal to synchronize with network; switching frequency to subcarrier by the terminal after receiving data. This invention reduces signal interference level, and obtains same synchronized signal quality.
Description
Technical field
The present invention relates to the simultaneous techniques in the time division duplex mobile communication system, relate to the method for synchronous of terminal works when subcarrier or rather.When adopting this method for synchronous, because the base station can be removed the broadcast singal and the downlink synchronous signal (Dwpts) of sending time slots 0 (TS0) from subcarrier, thereby can make system group network the time, be minimized the presence of intercell interference of bringing because of time slot 0 signal, still can obtain synchronizing signal quality identical when being operated in main carrier and be operated in terminal on the subcarrier.
Background technology
Mobile communication system needs to obtain synchronizing information in order to realize coherent demodulation.In time division duplex mobile communication system as TD-SCDMA or TSM (a kind of fusion implementation that adopts TD-SCDMA based on GSM network, air interface), the method that obtains synchronizing information is by extracting the downlink synchronous signal Dwpts of broadcast transmission, realizing that terminal and network side are synchronous.In actual applications, because the training sequence (midamble, intermediate code) of time slot 0 (TS0) is longer, its impulse response better, therefore also has the training sequence that extracts the TS0 broadcast singal to realize terminal and the synchronous scheme of network side under the few situation of activated code channel number.
But in the multicarrier system of using smart antenna is used, cover a sub-district by a main carrier and more than one subcarrier, because business time-slot can use the beam shaping of smart antenna, thereby reducing multiple access disturbs, and TS0 signal and the downlink synchronous signal (Dwpts) launched with broadcast mode are theaomni-directional transmission, thereby interference is difficult to avoid.The interference level of minizone broadcast singal when reducing networking can adopt the method that does not send TS0 signal and downlink synchronous signal in subcarrier, makes the phase mutual interference of minizone drop to minimum.
In multicarrier system, generally by main carrier carrying broadcast and Common Control Channel message, and subcarrier generally is used for bearer service channels.But owing to do not send TS0 signal and downlink synchronous signal in subcarrier, then also lost the broadcasting of synchronizing information, terminal can not obtain synchronizing signal.The common way that addresses this problem is to adopt the synchronous method of training sequence that is similar to TS0, use the training sequence of the current downlink business time slot that receives to carry out synchronously (for example terminal works can use the training sequence of TS4 to carry out synchronously) when time slot TS4.At this moment because use the training sequence of the received signal of downlink business time slot to carry out synchronously, then the user on this business time-slot more for a long time, owing to near-far interference, remote subscriber is also bigger to the interference of near-end user, makes net synchronization capability reduce greatly.Because the existence of the discontinuous emission in base station (DTX) situation is launched as taking TS4-TS6 discontinuously, and terminal just detects less than corresponding training sequence when not launching in the base station, just can not obtain synchronizing information, make and use business time-slot to become difficult synchronously in addition.
In sum, in the multicarrier system of using smart antenna is used, if on the major-minor carrier wave all omni broadcast emission TS0 signal and downlink synchronous signal, during networking the interference of minizone broadcast singal bigger, make power system capacity reduce.Yet, not broadcast transmission TS0 signal and downlink synchronous signal on subcarrier, that gives the terminal that is operated on the subcarrier again brings difficulty synchronously.
Summary of the invention
The objective of the invention is to design the method for synchronous of a kind of time division duplex mobile communication system terminal works when subcarrier, can remove the broadcast singal and the downlink synchronous signal Dwpts that send TS0 (time slot 0) in the subcarrier of base station from, the signal interference level of minizone TS0 is minimized when making networking, and terminal still can obtain the quality of synchronizing signal identical when being operated in main carrier.
The technical scheme that realizes the object of the invention is such, the method for synchronous of a kind of time division duplex mobile communication system terminal works when subcarrier, the base station sends on main carrier and is used for the data in synchronization piece, removes from sending on subcarrier being used for the data in synchronization piece, it is characterized in that comprising:
A. be assigned to the terminal of working on the subcarrier, the non-business time-slot before main carrier is used for the data in synchronization piece switches to main carrier with frequency in the time period, collects main carrier and is used for the data in synchronization piece, and utilize this data block and network side to carry out synchronously;
B. after this terminal receives and is used for the data in synchronization piece, frequency is switched back on the subcarrier.
It is time slot TS0 intermediate code midamble data that described main carrier is used for the data in synchronization piece;
Switching in the described steps A is to finish at time slot TS6, finish the switching from the subcarrier to the main carrier and reach stable in the time before the TS0 intermediate code midamble, described be synchronously by receive on the main carrier this time slot TS0 intermediate code midamble data realize described synchronously;
Switching among the described step B be after time slot TS0 intermediate code midamble, time slot TS1 finishes from main carrier in the time before beginning and gets back to the switching of described subcarrier and reach stable.
Switching in the described steps A, be by terminal receiver finish at described time slot TS6, in time before the TS0 intermediate code midamble, change local frequency, be locked in receive frequency on the main carrier and the described time slot TS0 intermediate code midamble data of reception on this main carrier; Switching among the described step B, be by terminal receiver after described time slot TS0 intermediate code midamble, time slot TS1 is in the time before beginning, and changes local frequency, receive frequency is locked on the subcarrier.
The described data in synchronization piece that is used for is downlink synchronous signal Dwpts;
Switching in the described steps A is to finish the switching from the subcarrier to the main carrier and reach stable in time before receiving downlink synchronous signal Dwpts, time slot TS0 intermediate code midamble after, and described is to realize described synchronous by the downlink synchronous signal Dwpts data that receive on the main carrier synchronously;
Switching among the described step B is the time after receiving downlink synchronous signal Dwpts, before the time slot TS1 to finish the switching from the main carrier to the subcarrier and reach stable.
Switching in the described steps A, be by terminal receiver in the time before receiving downlink synchronous signal Dwpts, after the time slot TS0 intermediate code midamble, change local frequency, be locked in receive frequency on the main carrier and the described downlink synchronous signal Dwpts data of reception on this main carrier; Switching among the described step B is by the time of terminal receiver after receiving downlink synchronous signal Dwpts, before the time slot TS1, changes local frequency, and receive frequency is locked on the subcarrier.
The invention provides a kind of in tdd systems such as TD-SCDMA or TSM system, terminal synchronization method during multicarrier, when terminal is assigned on the subcarrier, at time slot 0 (TS0) constantly or constantly at downlink synchronization slot (Dwpts), in time switch on the main carrier, still use the TS0midamble or downlink synchronization slot (Dwpts) signal of main carrier to carry out synchronously, and after finishing synchronously, promptly switch back transmission uplink service signal and reception downlink business signal on the subcarrier again.
Switch on the main carrier be used on one side vacant data block of data in synchronization piece (TS0midamble on one side vacant data block or utilize Dwpts vacant data block on one side) time period, switching back on the subcarrier then is the time period of the vacant data block that is used for data in synchronization piece another side (the vacant data block of TS0 midamble another side or utilize the vacant data block of Dwpts another side), promptly switch to and carry out on the main carrier synchronously, switch back subcarrier again after receiving the synchronizing signal of wishing to receive (TS0 midamble or Dwpts).Specifically, utilize Dwpts to carry out the major-minor intercarrier constantly and switch to realize it being time and the Dwpts time of utilizing TS0 second half section data block to arrive Dwpts to arrive the TS1 time before synchronously; Utilize TS0midamble to carry out the major-minor intercarrier constantly and switch to realize being the time of utilizing TS0 midamble both sides data block synchronously.
The method for synchronous of terminal works provided by the invention when subcarrier, can remove broadcast transmission TS0 signal and downlink synchronous signal Dwpts in the subcarrier of base station from, the signal interference level of minizone TS0 is minimized when making networking, and terminal still can obtain the quality of synchronizing signal identical when being operated in main carrier.
Description of drawings
Fig. 1 is that the inventive method realizes synchronous signal waveform schematic diagram;
Fig. 2 is the concrete major-minor carrier wave switching waveform figure of terminal works when subcarrier;
Fig. 3 is that the present invention realizes synchronous FB(flow block).
Embodiment
Tdd systems such as TD-SCDMA or TSM system, system signal is time division duplex, S-CDMA signal, its structure of time slot is shown in the 1st row among Fig. 1, comprise TS0 to TS6 time slot, and be positioned at downward guide time slot Dwpts and up guide time slot Uppts between TS0 and TS1, each time slot among the TS0 to TS6 all has an intermediate code midamble part, and terminal uses the downlink synchronous signal Dwpts of downward guide time slot or the midamble of TS0 to carry out synchronously usually.
Method of the present invention is the terminal synchronization method when multicarrier, and the base station is broadcast transmission TS0 and downlink synchronous signal on main carrier, does not then send TS0 and downlink synchronous signal on subcarrier.When terminal is assigned on the subcarrier, still use main carrier to carry out utilizing Fig. 1 that its implementation procedure is described below synchronously.
How the terminal that explanation earlier is operated on the subcarrier utilizes the midamble of main carrier TS0 to carry out synchronously.After terminal is assigned on the subcarrier, shown in B among Fig. 1, at TS0 constantly, the terminal radio frequency receiver changes local frequency, receive frequency is locked on the main carrier, thus the TS0 signal on the reception main carrier, after receiving TS0 midamble signal, terminal receiver changes local frequency, receive frequency is locked on the subcarrier, and works on subcarrier.Its switching waveform is shown in B among Fig. 1, and t1-t2 and t3-t4 are respectively the protection of frequency when switching at interval among the figure, and t2-t3 receives the time interval that main carrier time slot 0midamble carries out down-going synchronous.Whole signals that this moment, terminal received are shown in the C among Fig. 1, it is the two parts of signals that the receives complete signal after synthetic, wherein the down-going synchronous head works on after switching back subcarrier as receiving the data on the subcarrier business time-slot TS4 from the TS0midamble signal of main carrier.
Illustrate again how the terminal that is operated on the subcarrier utilizes main carrier downlink synchronous signal Dwpts to carry out synchronously.After terminal is assigned on the subcarrier, shown in A among Fig. 1, in the moment of downlink synchronization slot, the terminal radio frequency receiver changes local frequency, receive frequency is locked on the main carrier, thus the downlink synchronous signal Dwpts on the reception main carrier, after receiving the Dwpts signal, terminal receiver changes local frequency, receive frequency is locked on the subcarrier, and works on subcarrier.Its switching waveform is shown in A among Fig. 1, and t1-t2 and t3-t4 are respectively the protection of frequency when switching at interval among the figure, and t2-t3 receives the time interval that main carrier downlink synchronous signal Dwpts carries out down-going synchronous.Whole signals that this moment, terminal received are shown in the D among Fig. 1, it is the two parts of signals that the receives complete signal after synthetic, wherein the down-going synchronous head works on after switching back subcarrier as receiving the data on the subcarrier business time-slot TS4 from the downlink synchronous signal Dwpts of main carrier.
The frequency of terminal by the major-minor intercarrier that is operated on the subcarrier switches, be implemented on the main carrier synchronously, why the method for bearer service can realize on subcarrier, be to utilize terminal when entering professional the transmission, terminal does not receive the broadcast message of TS0 always and sends the characteristics of uplink synchronous (Uppts) signal.For using the synchronous situation of downlink synchronous signal, before receiving downlink synchronous signal Dwpts, the time before the time of the second half section data block of TS0 and the TS1 can be used for carrying out the switching of major-minor intercarrier, the t1-t4 shown in A among Fig. 1.For using the synchronous situation of TS0 midamble, the t1-t4 shown in B among Fig. 1 can be switched with the time of TS0midamble both sides data block equally.
For example A among Fig. 1 and B, t1 terminal constantly switch to main carrier, and this process will be finished constantly at t2, after receiving the midamble data or receiving the Dwpts data t3 constantly terminal begin to switch back subcarrier, this process was finished before the moment at t4.
The guard time (t1-t2) that frequency switches (t3-t4) at interval, according to adopting downlink synchronous signal Dwpts or adopting the midamble of TS0 to carry out synchronous and different, according among Fig. 1 shown in the 2nd row as can be seen: as the midamble that uses TS0, switch to guard time (t1-t2)=(275-0) us of main carrier from subcarrier, switch back guard time (the t3-t4)=675-387.5=287.5us of subcarrier from main carrier; When using downlink synchronous signal Dwpts: guard time (the t1-t2)＞=675-387.5=287.5us that switches to main carrier from subcarrier; Switch back guard time (t3-t4)＞=(950-825)+(the 825-750)/2=162.5us of subcarrier from main carrier.
By above-mentioned relation as can be seen; when being to use downlink synchronous signal Dwpts, the situation of switch protecting time margin minimum switches back the guard time of subcarrier from main carrier; be the numerical value under the most abominable situation, just reach frequency locking time when being worth farthest when coverage distance.For designing radio-frequency transmitter preferably, be easy to meet the demands.But when the receiver frequency locking time is longer, can selects the midamble of main carrier TS0 to carry out synchronously, and not select downlink synchronous signal Dwpts to carry out synchronously, at this moment, the frequency locking time just may be required in 275us with interior.
Fig. 2 illustrates the handoff procedure waveform of a reality, and the local frequency by the testing radio frequency receiver obtains, and selects the midamble of main carrier TS0 to carry out synchronously.Begin to switch to main carrier at marker 1 point terminal, the phase-locked loop of receiver local oscillator is stable 2 of marker, locking time about 118us.Equally, begin to switch back subcarrier at marker 3 point terminals, the phase-locked loop of receiver local oscillator is stable 4 of marker, and locking time, about 110us finished synchronizing process.Terminal works is carried out on the main carrier frequency synchronously but switch on subcarrier frequency.
Referring to Fig. 3, the synchronizing process of terminal works shown in the figure when subcarrier.
Step 31, terminal is configured on the subcarrier and works;
Step 32 is configured to the terminal of working on the subcarrier, will in certain time interval (t1-t2) frequency be switched on the main carrier from subcarrier.
Can from two kinds of methods of synchronization, select a kind of carrying out synchronously this moment, if select to utilize receive the mode of the downlink synchronous signal Dwpts of main carrier, then before receiving downlink synchronous signal Dwpts, finish the switching from the subcarrier to the main carrier and reach stable in time of the second half section data block of TS0midamble; If select to utilize the mode that receives main carrier TS0 midamble, then in the preceding half segment data piece time of TS6 end, TS0midamble, finish the switching from the subcarrier to the main carrier and reach stable;
Step 53, terminal utilize synchronizing signal Dwpts on the main carrier or TS0 midamble carry out with network side synchronously, when utilizing the mode of the downlink synchronous signal Dwpts that receives main carrier, in the Dwpts signal time, receive the Dwpts signal, when utilizing the mode that receives main carrier TS0 midamble, in TS0, receive the midamble data, obtain synchrodata.
Step 54, after terminal receives the synchronizing signal of wishing to receive, rapidly frequency is switched back original subcarrier from main carrier, when utilizing the mode of the downlink synchronous signal Dwpts that receives main carrier, time before TS1 finishes the switching from the main carrier to the subcarrier and reaches stable, when utilizing the mode that receives main carrier TS0 midamble, then finish the switching from the main carrier to the subcarrier and reach stable in the data block time second half section of TS0 midamble.After the frequency stabilization, in the uplink and downlink timeslot that network side distributes, carry out normal professional transmission and receive in the terminal on the subcarrier.
The method for synchronous that is operated in the terminal on the subcarrier provided by the present invention, the base station only sends TS0 broadcast singal and down-going synchronous Dwpts signal on main carrier, the base station is removed transmission TS0 broadcast singal and down-going synchronous Dwpts signal from subcarrier, being operated in terminal on the subcarrier switches to operating frequency and obtains synchronizing information on the main carrier, switches back on the subcarrier again after finishing synchronously, thereby identical synchronizing signal quality in the effect of acquisition reduction minizone TS0 signal interference level, can also obtain being operated in main carrier the time.
Claims (7)
1. the method for synchronous of a time division duplex mobile communication system terminal works when subcarrier, the base station sends on main carrier and is used for the data in synchronization piece, removes from sending on subcarrier being used for the data in synchronization piece, it is characterized in that comprising:
A. be assigned to the terminal of working on the subcarrier, the non-business time-slot before main carrier is used for the data in synchronization piece switches to main carrier with frequency in the time period, collects main carrier and is used for the data in synchronization piece, and utilize this data block and network side to carry out synchronously;
B. after this terminal receives and is used for the data in synchronization piece, frequency is switched back on the subcarrier.
2. method according to claim 1 is characterized in that:
It is time slot TS0 intermediate code midamble data that described main carrier is used for the data in synchronization piece;
Switching in the described steps A is to finish at time slot TS6, finish the switching from the subcarrier to the main carrier and reach stable in the time before the TS0 intermediate code midamble, described be synchronously by receive on the main carrier this time slot TS0 intermediate code midamble data realize described synchronously;
Switching among the described step B be after time slot TS0 intermediate code midamble, time slot TS1 finishes from main carrier in the time before beginning and gets back to the switching of described subcarrier and reach stable.
3. method according to claim 2, it is characterized in that: the switching in the described steps A, be by terminal receiver finish at described time slot TS6, in time before the TS0 intermediate code midamble, change local frequency, be locked in receive frequency on the main carrier and the described time slot TS0 intermediate code midamble data of reception on this main carrier; Switching among the described step B, be by terminal receiver after described time slot TS0 intermediate code midamble, time slot TS1 is in the time before beginning, and changes local frequency, receive frequency is locked on the subcarrier.
4. method according to claim 3 is characterized in that: be applicable to when the frequency locking time of described terminal receiver and can not satisfy when main carrier switches back the desired guard time of subcarrier and requires and use.
5. method according to claim 1 is characterized in that:
The described data in synchronization piece that is used for is downlink synchronous signal Dwpts;
Switching in the described steps A is to finish the switching from the subcarrier to the main carrier and reach stable in time before receiving downlink synchronous signal Dwpts, time slot TS0 intermediate code midamble after, and described is to realize described synchronous by the downlink synchronous signal Dwpts data that receive on the main carrier synchronously;
Switching among the described step B is the time after receiving downlink synchronous signal Dwpts, before the time slot TS1 to finish the switching from the main carrier to the subcarrier and reach stable.
6. method according to claim 5, it is characterized in that: the switching in the described steps A, be by terminal receiver in the time before receiving downlink synchronous signal Dwpts, after the time slot TS0 intermediate code midamble, change local frequency, be locked in receive frequency on the main carrier and the described downlink synchronous signal Dwpts data of reception on this main carrier; Switching among the described step B is by the time of terminal receiver after receiving downlink synchronous signal Dwpts, before the time slot TS1, changes local frequency, and receive frequency is locked on the subcarrier.
7. according to claim 1 or 2 or 3 or 5 or 6 described methods, it is characterized in that: described base station sends on main carrier and is used for the data in synchronization piece, comprises time slot TS0 and is used for synchronous downlink synchronous signal Dwpts data block; Described on subcarrier, remove from sending be used for the data in synchronization piece, comprise time slot TS0 and be used for synchronous downlink synchronous signal Dwpts data block.
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Cited By (10)
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| CN101188848B (en) * | 2006-11-15 | 2010-05-12 | 大唐移动通信设备有限公司 | A method and system for frequency point transfer |
| CN101719786A (en) * | 2008-10-09 | 2010-06-02 | 华为技术有限公司 | Synchronous method, synchronous terminal and communication system |
| CN101267611B (en) * | 2007-03-12 | 2012-03-28 | 电信科学技术研究院 | A method and base station for power dispatching in time division duplex system |
| CN102547967A (en) * | 2012-01-11 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method, system and user device to realize synchronization through time division duplex long-term evolution system |
| CN102572975A (en) * | 2010-12-31 | 2012-07-11 | 中国移动通信集团公司 | Method, system and equipment for switching operating frequency of cells |
| CN102857314A (en) * | 2011-08-17 | 2013-01-02 | 北京泰美世纪科技有限公司 | Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal |
| CN103039114A (en) * | 2010-08-16 | 2013-04-10 | 瑞典爱立信有限公司 | Methods providing signal synchronization and related networks and devices |
| CN103582111A (en) * | 2012-07-27 | 2014-02-12 | 联芯科技有限公司 | Non-main carrier downlink synchronization method and device |
| CN101771951B (en) * | 2009-01-06 | 2014-08-06 | 电信科学技术研究院 | Method and device for transmitting radio messages |
| CN101772087B (en) * | 2008-12-31 | 2014-08-13 | 中兴通讯股份有限公司 | Multi-carrier management method |
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| FI102340B (en) * | 1997-01-16 | 1998-11-13 | Nokia Telecommunications Oy | Procedure for data communication and radio systems |
| JP3522619B2 (en) * | 2000-01-05 | 2004-04-26 | 株式会社エヌ・ティ・ティ・ドコモ | Transmitter in multi-carrier CDMA transmission system |
| CN1214671C (en) * | 2002-06-10 | 2005-08-10 | 华为技术有限公司 | Method for realizing synchronization between base stations in mobile communication system |
| JP3732811B2 (en) * | 2002-07-31 | 2006-01-11 | 松下電器産業株式会社 | Multicarrier transmission apparatus and multicarrier transmission method |
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| CN101188848B (en) * | 2006-11-15 | 2010-05-12 | 大唐移动通信设备有限公司 | A method and system for frequency point transfer |
| CN101267611B (en) * | 2007-03-12 | 2012-03-28 | 电信科学技术研究院 | A method and base station for power dispatching in time division duplex system |
| CN101719786A (en) * | 2008-10-09 | 2010-06-02 | 华为技术有限公司 | Synchronous method, synchronous terminal and communication system |
| CN101772087B (en) * | 2008-12-31 | 2014-08-13 | 中兴通讯股份有限公司 | Multi-carrier management method |
| CN101771951B (en) * | 2009-01-06 | 2014-08-06 | 电信科学技术研究院 | Method and device for transmitting radio messages |
| CN103039114A (en) * | 2010-08-16 | 2013-04-10 | 瑞典爱立信有限公司 | Methods providing signal synchronization and related networks and devices |
| CN103039114B (en) * | 2010-08-16 | 2016-09-28 | 瑞典爱立信有限公司 | Method and network of relation and device that signal synchronizes are provided |
| CN102572975A (en) * | 2010-12-31 | 2012-07-11 | 中国移动通信集团公司 | Method, system and equipment for switching operating frequency of cells |
| CN102857314A (en) * | 2011-08-17 | 2013-01-02 | 北京泰美世纪科技有限公司 | Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal |
| CN102857314B (en) * | 2011-08-17 | 2014-08-27 | 北京泰美世纪科技有限公司 | Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal |
| CN102547967A (en) * | 2012-01-11 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method, system and user device to realize synchronization through time division duplex long-term evolution system |
| CN103582111A (en) * | 2012-07-27 | 2014-02-12 | 联芯科技有限公司 | Non-main carrier downlink synchronization method and device |
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