CN101212270B - Synchronization adjustment method and system - Google Patents
Synchronization adjustment method and system Download PDFInfo
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- CN101212270B CN101212270B CN2006101698800A CN200610169880A CN101212270B CN 101212270 B CN101212270 B CN 101212270B CN 2006101698800 A CN2006101698800 A CN 2006101698800A CN 200610169880 A CN200610169880 A CN 200610169880A CN 101212270 B CN101212270 B CN 101212270B
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Abstract
The invention provides a synchronous adjustment method, comprising the processes: obtaining a preliminary initial sending time Tbegain of an uplink time gap and sending the uplink data to a base station at the time that a time deviation value T Delta is added in the Tbegain, wherein the time deviation value T Delta is a mean value of a time difference between a plurality of actual receiving time of up link channels and uplink initial time gap; adjusting the sending time of the uplink channel according to a synchronous migration command fed back from the base station so as to finish the synchronous adjustment. Meanwhile, the invention also provides a system which can realize the synchronous adjustment method and a base station as well as a terminal which compose the system. The technical proposal of the invention can save channel resources and reduce complexity of the implementation.
Description
Technical field
The present invention relates to the communications field, relate in particular to the synchronization adjustment method of a kind of TD-SCDMA system and form this system base-station and terminal.
Background technology
Uplink synchronous comprises two parts in present Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division SynchronizationCode Division-Multiple-Access) system:
One, the foundation of uplink synchronous
After subscriber equipment (UE, User Equipment) start, at first must set up down-going synchronous with the sub-district, can begin to set up uplink synchronous then.When UE inserts at random, though can receive descending pilot frequency time slot (DwPTS, the Downlink Pilot Time Slot) signal of base station, and do not know and the distance of base station (Node B), cause the up emission of UE can not arrive Node B synchronously.Therefore, in order to reduce the interference to conventional time slot, the uplink pilot time slot (UpPTS, Uplink Pilot Time Slot) that is sent in first of up channel carries out.Uplink synchronous code (SYNC_UL, Synchronous Uplink) Tu Fa x time can be by estimating to determine to the power of the DwPTS that receives and/or Primary Common Control Physical Channel (PCCPCH, Primary Common Control Physical Channel).Node B can estimate received power and time by detected SYNC_UL sequence in search window.Node B sends feedback information to UE then, provides UE emitted power next time and time adjusted value, so that set up uplink synchronous.Under the normal condition, NodeB makes UE in will 4 subframes after receiving SYNC-UL and replying.If UE does not receive from the replying of Node B, think that then synchronization request sends failure in 4 subframes.UE will random delay a period of time, begins to attempt synchronized transmission then.Uplink synchronous is generally used for the random access procedure of system, after system loses uplink synchronous, rebulids synchronous process and also will pass through above-mentioned steps.
Two, the maintenance of uplink synchronous
Because UE moves, UE is always changing to the distance of Node B.So in whole communication process, Node B must detect the due in of intermediate code in its uplink frame (Midamble) incessantly, and the x time of UE is carried out closed-loop control, to keep synchronous reliably.The detailed process of uplink synchronous is: Node B can estimate transmitting power and skew launch time of UE at same time slot by the Midamble sign indicating number of measuring each UE, in the available descending time slot of the next one, launch simultaneous bias (SS then, Synchronous Shift) order and power control (PC, Power Control) order is so that UE can suitably adjust the time and the power of UE down link according to these orders respectively.Thereby guaranteed the stability of uplink synchronous, can check a uplink synchronous in a time division duplex (TDD:Time Division Duplex) subframe.The adjustment step-length of uplink synchronous is configurable and is provided with that span is 1/8～1chip.The renewal of uplink synchronous has three kinds of possibility situations: increases a step-length, reduces by a step-length, and constant.
The requirement of TD-SCDMA system synchronization precision:
In the TD-SCDMA system, the step-length of adjusting is about 1/8 of chip width synchronously, promptly about 100ns.The precision that requires in real system and may reach then will be determined by the disposal ability and the detectability of baseband signal, generally may be at the width of 1/8 to 1 chip.Because synchronous detecting and control be each subframe (5ms) once, in general, at this moment between in the moving range of UE can not surpass tens centimetres, thereby this synchronization accuracy is enough, can't limit and influence the high-speed mobile of UE.
The realization of TD-SCDMA system synchronization:
As previously mentioned, the synchronous maintenance of TD-SCDMA system is that the adjustment by the SS command word realizes, and at special uplink channel, as DPCH (DPCH, Dedicated PhysicalChannel)) up sharing,, as physical uplink link sharing channel (PUSCH, and control channel Physical UplinkShared Channel)), shared information channel (HS-SICH, Shared Information Channel for HS-DSCH) as high speed descending sharing channel all needs the corresponding downstream physical channel to transmit SS message respectively.
Yet, by the existing as can be seen TD-SCDMA system of above-mentioned analysis, at each up channel corresponding SS Synchronization Control message is arranged all, though can guarantee efficient synchronization control like this, whenever newly-increased new up channel needs all to consider how corresponding SS message carries.In addition, when follow-up evolution need increase up channel newly,, will run into the problem of SS carrying difficulty, perhaps can waste certain downlink physical resource if there is not correspondingly down channel.
Summary of the invention
The technical problem to be solved in the present invention is to provide the synchronization adjustment method of a kind of TD-SCDMA system and forms this system base-station and terminal, can save channel resource, reduces the complexity that realizes.
The technical scheme that realizes the object of the invention is as follows:
A kind of synchronization adjustment method comprises:
Obtain the preliminary initial transmitting time T of ascending time slot
Begain, and at T
BegainIncrease time deviation amount T
ΔTime send upstream data to the base station, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Adjust the transmitting time of up channel according to the simultaneous bias order of base station feedback, and then finish synchronous adjustment, wherein, the simultaneous bias order of base station feedback generates in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
Preferably, at the simultaneous bias order of a plurality of terminals, adopt multiplexing mode this simultaneous bias order to be sent by down physical channel.
Preferably, described multiplex mode is the code division multiplexing mode.
A kind of terminal comprises:
Computing unit is used to obtain the preliminary initial transmitting time T of ascending time slot
Begain, and time deviation amount T
Δ, and trigger transmission and receiving element, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Send and receiving element, be used at T
Begain+ T
ΔTime sends upstream data to the base station, and the simultaneous bias order that receives base station feedback, and wherein, the simultaneous bias order of base station feedback generates in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy;
Adjustment unit is used for the transmitting time according to simultaneous bias order adjustment up channel.
A kind of base station comprises:
Send and receiving element, be used for the upstream data that receiving terminal sends, and simultaneous bias order is sent to terminal;
The simultaneous bias order generation unit is used for the time generation simultaneous bias order according to the upstream data of terminal transmission, wherein, generates simultaneous bias order in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
Preferably, adopt multiplex mode this simultaneous bias order to be sent at described transmission of the simultaneous bias order of a plurality of terminals and receiving element by down physical channel.
Preferably, described multiplex mode is the code division multiplexing mode.
A kind of synchronous Adjustment System comprises base station and terminal, wherein:
Described terminal comprises:
Computing unit is used to obtain the preliminary initial transmitting time T of ascending time slot
Begain, and time deviation amount T
Δ, and trigger transmission and receiving element, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Send and receiving element, be used at T
Begain+ T
ΔTime sends upstream data to the base station, and the simultaneous bias order that receives base station feedback;
Adjustment unit is used for the transmitting time according to simultaneous bias order adjustment up channel;
Described base station comprises:
Send and receiving element, be used for the upstream data that receiving terminal sends, and simultaneous bias order is sent to terminal;
The simultaneous bias order generation unit is used for the time generation simultaneous bias order according to the upstream data of terminal transmission, wherein, generates simultaneous bias order in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
Preferably, at the simultaneous bias order of a plurality of terminals, the transmission of described base station and receiving element adopt the mode of code division multiplexing by down physical channel this simultaneous bias order to be sent.
Preferably, described multiplex mode is the code division multiplexing mode.
Compared with prior art, the present invention has following beneficial effect:
The invention provides a kind of UE of being directed to and carry out central controlled synchronous adjustment scheme.By determining the preliminary initial transmitting time T of ascending time slot
Begain, and the actual reception time that calculates according to the time of reception of UE up channel and the departure T of desirable time of reception
ΔThereby, obtain the transmitting time T of each physical channel
Begain+ T
ΔLike this, the base station is according to T
ΔCan generate the SS control messages, UE adjusts according to the transmitting time of the SS message that receives to each uplink code channel, sends upstream data in the adjusted time to Node B then, thereby realizes adjusting synchronously.
Therefore, the present invention is directed to each UE and have only a SS message,, also can send by down physical channel the SS of a plurality of UE is multiplexing together by sign indicating number branch mode even if the base station will send the SS message of a plurality of UE in an ensuing subframe domestic demand.Like this, the present invention's existing scheme that may send a plurality of SS relatively can be saved channel resource greatly.
In addition, not needing to consider how to guarantee the realization of its uplink synchronous during newly-increased up channel, is not up-downgoing when occurring in pairs thereby better solved newly-increased channel again, the problem of SS carrying difficulty.
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Description of drawings
Fig. 1 is the subframe structure schematic diagram of TD-SCDMA system;
Fig. 2 is a synchronization adjustment method flow chart of the present invention;
Fig. 3 is a synchronization adjustment method flow chart of the present invention;
Fig. 4 is the synchronous Adjustment System block diagram of the present invention.
Embodiment
The present invention proposes a kind of central controlled synchronization adjustment method.Promptly adjusting synchronously is at UE, rather than at each up channel.
Fig. 1 is the subframe structure schematic diagram of TD-SCDMA system.In the TD-SCDMA system, a wireless frame period is 10ms, is divided into the subframe of 2 identical 5ms.Each wireless sub-frame; be divided into 7 business time-slots and 3 special time slots: descending pilot frequency time slot (DwPTS, Downlink PilotTime Slot), protection is (GP at interval; General protect) and uplink pilot time slot (UpPTS, UplinkPilot Time Slot).
TS1 and subsequent several subframes can be ascending time slot.For certain UE, the interior data of time slot must send in the same moment, otherwise the time difference of different code channels can bring unnecessary interference.In addition, the time difference of different ascending time slots also should be fixing, and the difference that equals timeslot number multiply by a time slots length, otherwise the relative spacing that two time slots will occur is too small, causes the interference between unnecessary time slot.So can adopt a kind of synchronization adjustment method of concentrated adjustment for certain UE.
As shown in Figure 2, the flow chart for the present invention adjusts synchronously comprises:
The preliminary initial transmitting time T of step 201, acquisition ascending time slot
Begain, and at T
BegainIncrease time deviation amount T
ΔTime send upstream data to the base station;
Below, in conjunction with Fig. 3, introduce synchronization adjustment method of the present invention in detail.
1, UE sends SYNC_UL to Node B, SYNC_UL adjustment amount computing time that Node B basis receives, and feed back to UE.
2, UE obtains the initialization time T of up channel by initial uplink synchronous process
Begain
This initial uplink synchronizing process can be random access procedure.In the once communication of UE,, can at first determine the preliminary initial transmitting time T of ascending time slot by random access procedure if there are a plurality of uplink physical channels simultaneously
Begain(being the transmitting time of time slot TS1), so, the transmitting time of each physical channel equals the departure that start of line slot time adds physical channel actual reception time and desirable time of reception, is T
Begain+ T
Δ
3, in a certain adjustment at interval subsequently, the actual reception time that calculates according to the time of reception of UE up channel j
With desirable time of reception
Departure
If a plurality of up channels are arranged, so T
ΔTo be the average of a plurality of channel actual reception times and desirable time of reception departure:
K is the uplink code channel number.
4, receiving terminal (base station) is according to T
ΔGenerate the SS control messages.
Be specially: if T
Δ＞T
Up, then generate the SS message that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the SS message that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the SS message of regularly adjusting.
If the base station needs to send the SS message of a plurality of UE in certain adjusts at interval, the SS message of different UEs can multiplexingly send by down physical channel together so.Mode is the mode of code division multiplexing preferably.
5, UE adjusts according to the transmitting time of the SS message that receives to each uplink code channel, sends upstream data in the adjusted time to Node B then, thereby realizes adjusting synchronously.
Again as shown in Figure 4, for realizing the system block diagram of aforementioned synchronous adjustment.This system comprises terminal and base station:
Described terminal comprises: send and receiving element 411, computing unit 412 and adjustment unit 413.
Described base station comprises: send and receiving element 421, computing unit 422 and SS order generation unit 423.
This system realizes that the process of adjusting synchronously is specific as follows:
1, the transmission of described end side and receiving element 411 send the ascending pilot frequency sign indicating number to the base station;
2, the transmission of described base station side and receive 421 and receive these ascending pilot frequency sign indicating numbers according to this ascending pilot frequency yardage evaluation time adjustment amount, sends to the transmission of end side and receives 411 by transmitting element 421 more then;
3, the transmission of end side and receive 411 the time adjustment amount of base station feedback delivered to computing unit 412 is obtained the preliminary initial transmitting time T of ascending time slot according to the time adjustment amount by this computing unit 412
Begain, and time deviation amount T
Δ, and trigger transmission and receive 411 at T
Begain+ T
ΔTime sends upstream data to the base station;
4, the transmission of base station side and receiving element 421 are received the upstream data that terminal sends, and by the time generation simultaneous bias order of simultaneous bias order generation unit 423 according to the upstream data of terminal transmission, are sent to terminal by sending and receiving 421 then;
5, the transmission of end side and receiving element 411 are received the simultaneous bias order of base station feedback, adjust the transmitting time of up channel according to simultaneous bias order by adjustment unit 413, and send upstream data to the base station, thereby finish synchronous adjustment in adjusted time.
In addition, described simultaneous bias order generation unit 423 can also comprise comparing unit 422, is used for T
ΔRespectively with T
UpAnd T
DownCompare, and comparative result is delivered to the simultaneous bias order generation unit.Like this, simultaneous bias order generation unit 423 just can generate simultaneous bias order in such a way according to comparative result:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
In addition, when the base station need send the simultaneous bias order of a plurality of terminals, described transmitting element 424 can adopt the mode of code division multiplexing by down physical channel this simultaneous bias order to be sent to terminal.
Aforementioned time deviation amount T
ΔIt is the difference of up channel j actual reception time and desirable time of reception.The actual reception time that end side calculates according to the time of reception of up channel j
With desirable time of reception
Departure
If a plurality of up channels are arranged, so T
ΔTo be the average of a plurality of channel actual reception times and desirable time of reception departure:
K is the uplink code channel number.
Below, the application of the technical scheme that the present invention adjusts synchronously is described by a specific embodiment.
Suppose that in the TD-SCDMA system a certain UE has two up channels 1 and 2, respectively in time slot 1 and 2.
1, UE obtains the initialization time T of up channel by initial uplink synchronous process
BegainIn the TD-SCDMA system, Node B can feed back a time adjustment amount according to the ascending pilot frequency sign indicating number that UE sends, and adjustment amount UE just can determine preliminary T according to this time
Begain
2, in a certain subframe subsequently, calculate according to the time of reception of UE up channel 1 and 2
J=1,2; Like this, the average of the departure of up channel 1 and actual reception time of 2 and desirable time of reception is:
3, the base station is according to T
ΔGenerate the SS control messages:
T
Δ＞T
Up, generate the SS message that up transmitting time is adjusted a step-length forward.
T
Δ＜T
Down, generate the SS message that up transmitting time is adjusted a step-length backward.
T
Up＞T
Δ＞T
Down, generate and do not do the SS message of regularly adjusting.
Wherein, T
UpAnd T
DownSynchronization accuracy by needs is definite, wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pFor adjusting step-length.
If the base station will send the SS message of a plurality of UE in an ensuing subframe domestic demand, can adopt mode that sign indicating number divides to send by down physical channel the SS of a plurality of UE is multiplexing together.Be that QPSK, SF16 can carry on the code channel of 88 bits promptly, construct 88 code lengths and be 88 orthogonal code (as, Hadamard) a data modulation system.Each orthogonal code can have two states (true form and turnover codes), gets wherein two orthogonal codes and can represent 4 kinds of states, can carry a SS message.Perhaps the positional information of the sign indicating number of united orthogonal is carried a SS message with an orthogonal code.Like this can be sending on SS message reuse to a code channel of a plurality of UE.
4, UE adjusts according to the transmitting time of the SS message that receives to each uplink code channel.SS has three kinds of states usually, and for example, SS=1 adjusts a step-length forward, and SS=0 does not adjust, and SS=-1 adjusts a step-length backward.UE receives that SS=1 just adjusts a step-length forward with the transmitting time of all channels.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1. a synchronization adjustment method is characterized in that, comprising:
Obtain the preliminary initial transmitting time T of ascending time slot
Begain, and at T
BegainIncrease time deviation amount T
ΔTime send upstream data to the base station, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Adjust the transmitting time of up channel according to the simultaneous bias order of base station feedback, and then finish synchronous adjustment, wherein, the simultaneous bias order of base station feedback generates in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
2. the method for claim 1 is characterized in that, at the simultaneous bias order of a plurality of terminals, adopts multiplex mode by down physical channel this simultaneous bias order to be sent.
3. method as claimed in claim 2 is characterized in that, described multiplex mode is the code division multiplexing mode.
4. a terminal is characterized in that, comprising:
Computing unit is used to obtain the preliminary initial transmitting time T of ascending time slot
Begain, and time deviation amount T
Δ, and trigger transmission and receiving element, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Send and receiving element, be used at T
Begain+ T
ΔTime sends upstream data to the base station, and the simultaneous bias order that receives base station feedback, and wherein, the simultaneous bias order of base station feedback generates in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy;
Adjustment unit is used for the transmitting time according to simultaneous bias order adjustment up channel.
5. a base station is characterized in that, comprising:
Send and receiving element, be used for the upstream data that receiving terminal sends, and simultaneous bias order is sent to terminal;
The simultaneous bias order generation unit is used for the time generation simultaneous bias order according to the upstream data of terminal transmission, wherein, generates simultaneous bias order in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
6. base station as claimed in claim 5 is characterized in that, at the simultaneous bias order of a plurality of terminals, described transmission and receiving element adopt multiplex mode by down physical channel this simultaneous bias order to be sent.
7. base station as claimed in claim 6 is characterized in that, described multiplex mode is the code division multiplexing mode.
8. a synchronous Adjustment System comprises base station and terminal, it is characterized in that:
Described terminal comprises:
Computing unit is used to obtain the preliminary initial transmitting time T of ascending time slot
Begain, and time deviation amount T
Δ, and trigger transmission and receiving element, described time deviation amount T
ΔIt is the average of several up channel actual reception times and last start of line time slots difference;
Send and receiving element, be used at T
Begain+ T
ΔTime sends upstream data to the base station, and the simultaneous bias order that receives base station feedback;
Adjustment unit is used for the transmitting time according to simultaneous bias order adjustment up channel;
Described base station comprises:
Send and receiving element, be used for the upstream data that receiving terminal sends, and simultaneous bias order is sent to terminal;
The simultaneous bias order generation unit is used for the time generation simultaneous bias order according to the upstream data of terminal transmission, wherein, generates simultaneous bias order in such a way:
With T
ΔRespectively with T
UpAnd T
DownCompare:
If T
Δ＞T
Up, then generate the simultaneous bias order that up transmitting time is adjusted a step-length forward;
If T
Δ＜T
Down, then generate the simultaneous bias order that up transmitting time is adjusted a step-length backward;
If T
Up＞T
Δ＞T
Down, then generate and do not do the simultaneous bias order of regularly adjusting;
Wherein: T
Up=T
p/ 2, T
Down=-T
p/ 2, T
pBe the adjustment step-length of determining according to synchronization accuracy.
9. system as claimed in claim 8 is characterized in that, at the simultaneous bias order of a plurality of terminals, the transmission of described base station and receiving element adopt the mode of code division multiplexing by down physical channel this simultaneous bias order to be sent.
10. system as claimed in claim 9 is characterized in that, described multiplex mode is the code division multiplexing mode.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754351B (en) * | 2008-12-05 | 2013-09-25 | 电信科学技术研究院 | Method, system and apparatus for synchronization of home base station |
| CN101873688B (en) * | 2009-04-22 | 2013-05-08 | 鼎桥通信技术有限公司 | Synchronization method of femtocell and macrocell and access method of user equipment |
| US20120275436A1 (en) * | 2009-12-01 | 2012-11-01 | QUALCOMM Intercorporated | Method and apparatus of processing synchronization shift commands in tdscdma uplink synchronization |
| CN102244536A (en) * | 2010-05-13 | 2011-11-16 | 中兴通讯股份有限公司 | Method and apparatus for uplink synchronization in mobile communication system |
| CN102573041B (en) * | 2010-12-31 | 2016-08-03 | 重庆重邮信科通信技术有限公司 | HSPA+ timing synchronization keeping method |
| CN102932903B (en) * | 2011-08-08 | 2015-05-20 | 京信通信系统（中国）有限公司 | Uplink synchronization control method and device, and base station |
| CN102932904B (en) * | 2011-08-09 | 2017-04-12 | 中兴通讯股份有限公司 | Method, system and device for synchronizing base station and terminal, and terminal |
| CN102348277B (en) * | 2011-11-24 | 2014-02-12 | 电信科学技术研究院 | Method and system for realizing terminal synchronization in hybrid self-organized network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001065724A1 (en) * | 2000-02-28 | 2001-09-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink transmit power synchronization during diversity communication with a mobile station |
| CN1797999A (en) * | 2004-12-27 | 2006-07-05 | 凯明信息科技股份有限公司 | Method for detecting synchronous shift signaling |
| CN1770664A (en) * | 2005-11-16 | 2006-05-10 | 中兴通讯股份有限公司 | Closed-loop uplink synchronization controlling method in wireless communication system |
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