CN100563127C - A kind of initial uplink method for synchronous in TDS-CDMA system - Google Patents
A kind of initial uplink method for synchronous in TDS-CDMA system Download PDFInfo
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- CN100563127C CN100563127C CNB2005100646768A CN200510064676A CN100563127C CN 100563127 C CN100563127 C CN 100563127C CN B2005100646768 A CNB2005100646768 A CN B2005100646768A CN 200510064676 A CN200510064676 A CN 200510064676A CN 100563127 C CN100563127 C CN 100563127C
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Abstract
The invention discloses a kind of initial uplink method for synchronous in TDS-CDMA system, each subframe comprises TS0, descending pilot frequency time slot DwPTS in this system, uplink pilot time slot UpPTS, protection time slot GP and TS 1～TS6, TS0～TS6 is a business time-slot, this method is: the travelling carriage As-received stands in the predetermined subframe after descending pilot frequency time slot DwPTS sends down-bound pilot frequency signal, finishes down-going synchronous; Travelling carriage does not send in the subframe of down-bound pilot frequency signal in the base station, finishes to a period of time that GP finishes, to choose a time point at TS0, and as the initial moment that sends uplink pilot signal to the base station, thus initiation initial uplink synchronizing process.And in the initial uplink synchronizing process, the base station was searched in a period of time that TS0 finishes to begin to TS1, detected uplink synchronizing signals.This method can make radius of society increase, and further satisfies the requirement that the remote subscriber inserts.
Description
Technical field
The present invention relates to the uplink synchronous technology in the mobile communication system, be meant a kind of initial uplink method for synchronous in TD SDMA (TD-SCDMA) system especially.
Background technology
TD SDMA (TD-SCDMA) system is based on the technology of time division duplex (TDD), and this system adopts the different time-gap at same frequency channels to receive and transmit data.
The physical channel of TD-SCDMA comprises three-decker: ground floor is a radio frames, and the second layer is a subframe, and the 3rd layer is time slot.Specifically, physical channel is made up of several radio frames, and a radio frames is 10ms, and each radio frames is divided into the subframe of continuous two 5ms again, and each subframe comprises seven business time-slots and three special time slots again.
As shown in Figure 1, the 0th time slot fixed allocation is to descending in seven business time-slots, and the 1st time slot fixed allocation is to up, and remaining time slot can distribute arbitrarily between up-downgoing.Three special time slots of oblique line filling part are respectively descending pilot frequency time slot (DwPTS), uplink pilot time slot (UpPTS), and protection time slot (GP).Wherein, the DwPTS time slot is used for sending descending synchronous code, finishes down-going synchronous; The UpPTS time slot is used for sending uplink synchronous code, and it is synchronous to finish initial uplink.Wherein, DwPTS comprises 96 chips (chip), and GP comprises 96chip, and UpPTS comprises 160chip, and the width of each chip is 0.78125us.
When the user is in idle condition, need to keep down-going synchronous and broadcast listening information, and from available uplink synchronous code one of picked at random, it is synchronous to be used for initial uplink.Initial uplink synchronizing process in the TD-SCDMA system is as follows:
The base station sends DwPTS to travelling carriage, and travelling carriage is finished down-going synchronous according to descending synchronous code after obtaining descending synchronous code.Travelling carriage obtains operable uplink synchronous code according to the corresponding relation between the uplink and downlink synchronous code.Travelling carriage sends UpPTS to the base station, base station search and detect the UpPTS that travelling carriage sends after, estimate the up transmitting time of this user's correspondence and the adjustment information of transmitting power, the base station is by the transmitting power and the transmitting time adjustment information of physical access channel (FPACH) notice travelling carriage; Travelling carriage is adjusted transmitted power and transmitting time after receiving the power and transmitting time of the needs adjustment that the base station sends, and the synchronous foundation of initial uplink is finished.
Said process is a uplink synchronous process basic in the prior art.In actual application, because the distance that exists between travelling carriage and the base station is indefinite, at travelling carriage when the base station sends UpPTS, the radio wave propagation time delay that produces may be different between the two, therefore, if make travelling carriage realize that initial uplink is synchronous, it seems from base station side, should make the start time point of the uplink synchronizing signals that receives drop on the GP of frame structure regulation in the time period.If this signal start time point advances in the DwPTS time period or in the time period of the TS1 that lags behind, the base station may be gone up the interference of other signals and can't detect this uplink synchronizing signals owing to DwPTS or TS1, causes the initial uplink synchronization failure.
Therefore, travelling carriage is when sending UpPTS, and in order to satisfy above-mentioned time requirement, travelling carriage must send UpPTS in advance on frame structure official hour basis, falls into the TS1 of base station in the time when avoiding this signal to arrive base station.And travelling carriage can only advance to UpPTS the time that DwPTS finishes at most and sends, i.e. 96 chip in advance, drop on the DwPTS of base station in the time when avoiding this signal to arrive base station at i.e. time of GP length.
If but radius of society is too big,, when arriving the base station, UpPTS still may fall into the TS1 of base station in the time period because of propagation delay even travelling carriage shifts to an earlier date the GP time with the UpPTS signal sending time and sends so.This that is to say that the covering radius of sub-district is retrained by GP,
Radius of society is: the number of chips * light velocity that can send in advance/(spreading rate * 2)
So, because the number of chips that can send in advance at present is 96, the light velocity is 30 * 10
4Km/s, spreading rate are 1.28M/S, therefore, are 11.25KM by calculating radius of society.This that is to say, is under the situation of 96 chip at GP, and coverage radius of cell is 11.25 kilometers to the maximum.
And, after introducing N frequency system, even terminal sends Up-PTS at the frequency that does not send DwPTS, because existing to the energy of other frequency at emission DwPTS, the base station reveals, and the decay of this energy is often less than path loss, therefore terminal still can only send UP-PTS after receiving DwPTS, is disturbed by the band external leakage of down-bound pilot frequency signal with the uplink synchronizing signals of avoiding the base station to receive.
In sum, the radius bottleneck of list/multi-frequency point TD-SCDMA sub-district is 11.25Km at present.But because TD-SCDMA is operated in about 2GHz frequency range among the 3GPP, the covering radius of 11.25km can satisfy general networking demand.If but TD-SCDMA technology is applied in than low-frequency range, as the trunked communication system of 400MHz, then might need bigger covering radius in the part grass roots, as 20 kilometers.But prior art has limited radius of society can not surpass 11.25KM, if surpass this restriction, the base station can't detect uplink synchronizing signals, and terminal can't access network.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of initial uplink method for synchronous in the TD-SCDMA system, this method can increase radius of society, and then satisfies the access requirement of remote travelling carriage.
In order to achieve the above object; the invention provides a kind of initial uplink method for synchronous in the TD-SCDMA system; each subframe comprises TS0, descending pilot frequency time slot DwPTS in the TD-SCDMA system; uplink pilot time slot UpPTS, protection time slot GP and TS1～TS6; TS0～TS6 is a business time-slot, and this method is achieved in that
A. travelling carriage is finished down-going synchronous according to the down-bound pilot frequency signal that the base station sends by descending pilot frequency time slot DwPTS in predetermined subframe;
B. travelling carriage does not send in the subframe of down-bound pilot frequency signal in the base station, finish to a period of time that GP finishes, to choose a time point at time slot TS0, as the initial moment that sends uplink pilot signal to the base station, the initiation initial uplink is synchronous, and it is synchronous to finish initial uplink.
In step b, in the travelling carriage initial uplink synchronizing process, the base station was searched in a period of time that described TS0 finishes to begin to TS1, detected uplink synchronizing signals.
It is synchronous to initiate initial uplink among the step b, finishes the synchronous step of initial uplink and comprises:
B1, base station were searched in the time that described TS0 finishes to begin to TS1, and estimated the up transmitting time of user's correspondence and the adjustment information of transmitting power according to the uplink synchronizing signals that searches;
The transmitting power and the transmitting time adjustment information of b2, base station notice travelling carriage;
B3, travelling carriage are adjusted transmitted power and transmitting time after receiving the power and transmitting time of the needs adjustment that the base station sends, and initial uplink is finished synchronously.
The base station is by the transmitting power and the transmitting time adjustment information of physical access channel FPACH notice travelling carriage among the step b2.
Predetermined subframe described in the step a is to set in the cycle.
Cycle described in the step a is fixed, or the random time interval.
The inventive method in the TD-SCDMA system by the uplink and downlink pilot signal is sent at interval and, the window of UP-PTS is detected for behind TS0 in the base station, before lasting till that TS1 begins, radius of society is increased, further satisfy the requirement that the remote subscriber inserts.And can be by calculating, send uplink synchronizing signals owing to can shift to an earlier date 96 chips again, therefore radius of society can be expanded as 22.5km, like this, using method of the present invention can make the travelling carriage that is between 11.25km～22.5km can't to finish initial uplink not synchronous because of the influence of distance.
Description of drawings
Fig. 1 is the subframe structure of TD-SCDMA system;
Fig. 2 realizes the schematic flow sheet that initial uplink is synchronous for the present invention;
Fig. 3 sends the time of uplink pilot signal and the time diagram that uplink pilot time slot is detected in the base station for the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention adopts frame structure same as shown in Figure 1.It is emphasized that: for the DwPTS among the present invention, in specific subframe, be used to send down-bound pilot frequency signal, and in unspecific subframe, this time slot can be used for offering travelling carriage and sends uplink pilot signal.That is to say that the base station can send down-bound pilot frequency signal at this time slot in predetermined subframe, do not send in the subframe of down-bound pilot frequency signal that travelling carriage can utilize this time slot to send uplink pilot signal in the base station.
And, can set emission cycle of Dw-PTS down-bound pilot frequency signal, such as every down-bound pilot frequency signal of N frame emission, wherein N can be for greater than 1 integer.Certainly, the emission cycle can be a certain numerical value of fixing, such as the emission cycle be 2, then downlink synchronous signal sends once every a frame, also can be a series of value of presetting, as for the first time and 3 subframes of the transmission interval second time, second with 4 subframes of transmission interval for the third time etc.
Referring to shown in Figure 3, travelling carriage can utilize not the subframe of transmitting downstream pilot signal to utilize descending time slot emission uplink pilot signal, the time period that sends uplink pilot signal so be DwPTS when beginning with the GP end between, that is to say, when beginning for DwPTS the earliest, when finishing for GP the latest; The base station should be when TS0 finishes to the searching and detecting window of UP-PTS, and before lasting till that TS1 begins.
Like this, travelling carriage is launched UpPTS in the subframe of not launching DwPTS, and the zero-time of emission UpPTS can be expanded 96 Chip forward, therefore occupy the position of original DwPTS, utilize the formula of above-mentioned radius of society can calculate radius of society and be 22.5KM.
Based on this, referring to shown in Figure 2, initial uplink synchronizing process of the present invention is as follows:
Step 201: the base station sends DwPTS to travelling carriage in predetermined subframe, and travelling carriage is finished down-going synchronous according to descending synchronous code after obtaining descending synchronous code.
Step 202: travelling carriage is according to the corresponding relation between the uplink and downlink synchronous code, obtain operable uplink synchronous code, and do not send in the subframe of DwPTS in the base station, travelling carriage is in a period of time that finishes from TS0 when GP finishes, choose a time point, as the start time point that sends UpPTS to the base station, concurrently serve capable pilot frequency sequence.
Step 203: base station search estimates the up transmitting time of this user's correspondence and the adjustment information of transmitting power behind the UpPTS of travelling carriage transmission, by the transmitting power and the transmitting time adjustment information of physical access channel (FPACH) notice travelling carriage.And, not sending in the subframe of DwPTS in the base station, the search window of base station is for when TS0 finishes, and before lasting till that TS1 begins.
Certainly, send in the subframe of DwPTS in the base station, travelling carriage also can send uplink synchronizing signals in the time period in the prior art, and this moment, the searching and detecting window of base station can remain unchanged.
Step 204: travelling carriage is adjusted transmitted power and transmitting time after receiving the power and transmitting time of the needs adjustment that the base station sends.The synchronous foundation of initial uplink is finished.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (6)
1, a kind of initial uplink method for synchronous in TDS-CDMA system; each subframe comprises TS0, descending pilot frequency time slot DwPTS in this system; uplink pilot time slot UpPTS, protection time slot GP and TS1～TS6; TS0～TS6 is a business time-slot; it is characterized in that this method may further comprise the steps:
A. travelling carriage is finished down-going synchronous according to the down-bound pilot frequency signal that the base station sends by descending pilot frequency time slot DwPTS in predetermined subframe;
B. travelling carriage does not send in the subframe of down-bound pilot frequency signal in the base station, finish to a period of time that GP finishes, to choose a time point at time slot TS0, as the initial moment that sends uplink pilot signal to the base station, the initiation initial uplink is synchronous, and it is synchronous to finish initial uplink.
2. initial uplink method for synchronous according to claim 1 is characterized in that: in step b, in the travelling carriage initial uplink synchronizing process, the base station was searched in a period of time that described TS0 finishes to begin to TS1, detected uplink synchronizing signals.
3, method according to claim 2 is characterized in that, the initiation initial uplink is synchronous among the step b, finishes the synchronous step of initial uplink and comprises:
B1, base station were searched in the time that described TS0 finishes to begin to TS1, and estimated the up transmitting time of user's correspondence and the adjustment information of transmitting power according to the uplink synchronizing signals that searches;
The transmitting power and the transmitting time adjustment information of b2, base station notice travelling carriage;
B3, travelling carriage are adjusted transmitted power and transmitting time after receiving the power and transmitting time of the needs adjustment that the base station sends, and initial uplink is finished synchronously.
4, method according to claim 3 is characterized in that, the base station is by the transmitting power and the transmitting time adjustment information of physical access channel FPACH notice travelling carriage among the step b2.
5, method according to claim 1 is characterized in that, predetermined subframe described in the step a is to set in the cycle.
6, method according to claim 5 is characterized in that, the cycle described in the step a is fixed, or the random time interval.
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| CNB2005100646768A CN100563127C (en) | 2005-04-19 | 2005-04-19 | A kind of initial uplink method for synchronous in TDS-CDMA system |
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Cited By (1)
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| US8767697B2 (en) | 2007-09-14 | 2014-07-01 | Telefonaktiebolaget L M Ericsson (Publ) | TDD time slot splitting |
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| CN101282567B (en) * | 2007-04-03 | 2011-09-21 | 中兴通讯股份有限公司 | System capable of supporting a plurality of multiple accesses |
| CN101123463B (en) * | 2007-08-10 | 2011-01-26 | 福建邮科通信技术有限公司 | Implementation method for remote distance relay of TD-SCDMA repeater |
| CN101389053B (en) * | 2007-09-11 | 2011-08-31 | 电信科学技术研究院 | Multimedia broadcast multicast service transmission method and system |
| CN101399607B (en) * | 2007-09-29 | 2013-01-02 | 北京信威通信技术股份有限公司 | Effective distance measuring method and device in wireless communication system |
| CN101426266B (en) * | 2007-10-29 | 2010-06-02 | 中国移动通信集团公司 | Method and apparatus for bearing multimedia broadcast multicast service |
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| CN101621843B (en) * | 2009-07-28 | 2011-11-09 | 新邮通信设备有限公司 | Uplink synchronization method, network side equipment, user equipment (UE) and mobile communication system |
| CN102664698A (en) * | 2011-12-27 | 2012-09-12 | 华为技术有限公司 | Method, device and system for providing synchronous deviation time |
| CN102695280B (en) * | 2012-06-26 | 2014-12-31 | 华为技术有限公司 | System-compatible data frame conversion method and device |
| CN106888503A (en) * | 2017-03-29 | 2017-06-23 | 武汉米风通信技术有限公司 | A kind of broadcasting and TV frequency spectrum ultra-narrow band Internet of Things time calibrating method and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8767697B2 (en) | 2007-09-14 | 2014-07-01 | Telefonaktiebolaget L M Ericsson (Publ) | TDD time slot splitting |
| USRE45653E1 (en) | 2007-09-14 | 2015-08-11 | Telefonaktiebolaget L M Ericsson (Publ) | Subframes in a cellular communications system |
| US9699322B2 (en) | 2007-09-14 | 2017-07-04 | Telefonaktiebolaget Lm Ericsson (Publ) | TDD time slot splitting |
| US11405508B2 (en) | 2007-09-14 | 2022-08-02 | Telefonaktiebolaget Lm Ericsson (Publ) | TDD time slot splitting |
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