CN101123463A - Implementation method for remote distance relay of TD-SCDMA repeater - Google Patents
Implementation method for remote distance relay of TD-SCDMA repeater Download PDFInfo
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Abstract
The invention relates to a method to achieve distant relay of a TD-SCDMA relay station, which comprises the following steps. Firstly, the TD-SCDMA relay station acquires the downlink frequency pilot synchronization time and is synchronous with a base station, and acquires the position of a second transition point through networks or manually. Secondly, the TD-SCDMA relay station is synchronous with the base station, and then executes N subframes incessantly, namely, executes actions in the condition A. Thirdly, after completion of the condition A, the TD-SCDMA relay station executes M subframes incessantly, namely, executes actions in the condition B. Fourthly, after completion of the condition B, TD-SCDMA relay stations comes into the condition A automatically; and the relay station executes actions incessantly in either the condition A or the condition B on a periodic basis. By adopting the method, the adaptability and function of the relay station in TD-SCDMA network are significantly improved.
Description
Technical field:
The present invention relates to the remote relaying implementation method in a kind of TD-SCDMA repeater.
Background technology:
In the TD-SCDMA system, uplink signal and down link signal are in same frequency, distinguish uplink and downlink by time-multiplexed mode.Therefore the TD-SCDMA repeater need obtain the temporal information of up-downgoing transfer point, realizes that the up-downgoing of its radio frequency link is switched, thus reach with system synchronously.Industry has several representative synchronization scenarios at present: the level triggers synchronization scenario, the GPS synchronization scenario, detection synchronization scenario and base band demodulating synchronization scenario etc., these schemes all are subjected to the restriction of GP size in the TD-SCDMA frame format, make the distance of repeater and base station not cross 11km (optical fiber not repeater is crossed 6.7km) in the repeater.
In theory, TD base station system itself can break through the GP restriction, support 20 even 40 kilometers covering, but be subjected to the influence of radio frequency link budget, single base station can not show such ability, only under the situation of carrying repeater (particularly optical fiber repeater), just may bring up to distance more than 20 kilometers to link budget.Therefore, how solving the problem that the repeater synchronization scenario is subject to the GP size, is the key that improves TD wide area networking capability.
Summary of the invention:
The object of the present invention is to provide the remote relaying implementation method in a kind of TD-SCDMA repeater, this method can make the adaptive capacity of repeater in the TD-SCDMA network and effect improve greatly.
This method comprises the steps:
The a.TD-SCDMA repeater obtains the descending pilot frequency synchronization point, and acquisition is synchronous with the base station, learns second position of conversion point by network or artificial the setting simultaneously;
N subframe will be carried out continuously in the b.TD-SCDMA repeater after obtaining synchronously, promptly carry out the action of A condition;
M subframe will be carried out again continuously in the c.TD-SCDMA repeater after A condition finishes, promptly carry out the action of B state;
D. after the B state finished, the TD-SCDMA repeater changed A condition again automatically over to, and the repeater is constantly samsara execution in two states.
Above-mentioned a step, any mode except that level triggers of using synchronously of repeater triggers.
Above-mentioned b step is carried out A condition and is obtained allowing the synchronous of travelling carriage and base station down, it is characterized by the zero hour that first switching point is GP.
Above-mentioned b step, the execution frame number N of A condition is a variable, scope can more than or equal to 4 with select smaller or equal to 30 integer range.
Above-mentioned c step is carried out the B state and is obtained allowing up synchronous of base station and travelling carriage, it is characterized by the zero hour that first switching point is DWPTS.
Above-mentioned c step, the execution frame number M of B state is a variable, scope can more than or equal to 1 with select smaller or equal to 30 integer range.
The present invention is by the analysis to synchronization scenario in the TD-SCDMA network and equipment covering power, realized a kind of new repeater Synchronization Control scheme, the adaptive capacity of repeater in the TD-SCDMA network and effect are improved greatly, also proposed new approaches for the large-scale network-estabilishing of TD-SCDMA.
Description of drawings:
Fig. 1 is the subframe up-downgoing link schematic diagram of the TD-SCDMA of adding repeater;
Fig. 2 is the synchronous schematic diagram of TD-SCDMA system subframe uplink;
Fig. 3 is based on the synchronous schematic diagram of TD-SCDMA system's subframe uplink of the present invention.
Embodiment:
The relaying principle of TD repeater: the similar distance that has shortened base station and travelling carriage greatly of effect that use the repeater increases the coverage of base station.But one road signal can only be amplified in some moment in the repeater, not that up link is exactly a down link, two paths of signals can't be amplified simultaneously, greater than GP/2=48chips the time, the situation that SYNC_UL code loses will be occurred in the propagation delay time of repeater and base station like this.
As shown in Figure 1, it is synchronization that the UpPTS of all travelling carriages of TD-SCDMA system requirements arrives the base station, be the A point, travelling carriage is for reaching this target, and its UpPTS must launch in advance, and it shifts to an earlier date emission measure (not being the initial amount of setting), and (T is the time delay that travelling carriage is arrived in the base station for T*2, comprising the propagation delay time of repeater), be the B point, UpPTS arrives the repeater through t (time delay between repeater and travelling carriage), is the C point; And the desirable transfer point of repeater (being the zero hour of GP), be the D point, from figure, can it is evident that, before the C point is positioned at the D point, be that UPPTS is in during the down link amplification, closing of up link at this time, the result is that the base station is detected less than SYNC_UL code, mobile phone opens exhales failure.
As seen, existing repeater synchronization scenario reach with base station distance can only be near 11.25 kilometers.
After adding the repeater, if GP/2=48chips is crossed in the time delay repeater between base station and the repeater,, allow the repeater still can bring into play relaying action how by improving synchronization scenario, below provide a kind of solution.
We learn from system principle, on the basis of 11.25 kilometers of noiseless radiuses, if coverage radius of cell continues to enlarge, UpPTS can produce DwPTS and disturb, do not disturb but can not produce TS0, at this moment, the user that initiation in this zone inserts application at random can produce interference near the user who does search of initial zone it, but because this probability of happening is very little, and the every 5ms of search of initial zone gets final product retry, therefore the search time that has just increased the UE initial cell slightly, little to the mass of system influence, like this, the 2T that can accept has arrived (96+96) chips, and coverage radius of cell can expand to the distance of 22.5km from 11.25km.
In like manner, the repeater also can utilize DwPTS as the up period of emission in advance.We open the DwPTS period of down link in the frame of number N, and below N frame we close the DwPTS period of down link, and period of amplifying as up UpPTS.DwPTS in each subframe is as descending pilot frequency and design synchronously.DwPTS is placed on independent time slot, and one is to be convenient to obtaining rapidly of down-going synchronous, also can reduce the interference to other downstream signals simultaneously.Briefly, independent DWPTS is the Cell searching problem that solves under honeycomb and mobile environment.We can be the effect of analyzing it process of travelling carriage and synchronization among base stations from Cell searching just like this.
The effect of DwPTS has: at first the position of travelling carriage acquisition DwPTS obtains synchronously and pilot code-SYNC-DL code, after learning SYNC-DL code, confirm scrambler and basic midamble sign indicating number, be enough to detect the position of P-CCPCH at last by [n] individual continuous DwPTS.And in other signaling procedures, DWPTS does not have effect substantially.
Set forth travelling carriage below and be how to obtain up-downgoing respectively by DwPTS and UpPTS synchronous
1. down-going synchronous
Travelling carriage is by detecting one by one the SYNC-DL code among the DWPTS that receives, find corresponding with it downlink synchronous sequence, the down-going synchronous scheme of travelling carriage is had nothing in common with each other, but the size of its operand is inversely proportional to synchronization delayed time length and circuitry/software design complexity.Certainly we expect least amount calculation, like this to the burden minimum of travelling carriage chip and battery, this is total prerequisite, finds balance point afterwards between the three, in general, by seeking the power features of DWPTS, after determining the GP border, determine the SYNC-DL code that use the sub-district according to the principle of matched filter again, have nothing in common with each other the search time of the travelling carriage of different manufacturers, our uncertain its absolute value here is defined as the individual subframe of N (N＞1) search time that travelling carriage is needed.
After finding SYNC-DL code, travelling carriage need be discerned P-CCPCH and the starting point of the frame number that interweaves by the detection of 4 continuous DwPTS synchronous codes.
2. uplink synchronous
The effect of UPPTS is that travelling carriage " tells " base station: I will enter (inserting at random), please see clearly my name (SYNC-ULcode), and for I carry out same step calibration.Travelling carriage is promised by FPACH burst in the base station after the calling of " hearing " travelling carriage, and " notice " travelling carriage is ready.According to know-why, the emission of travelling carriage UPPTS is that " regularly " is on UPPCH, but because aerial propagation delay time, need certain lead, in the moment that begins to launch, can come the propagation delay time between calculation base station and travelling carriage according to the loss of received power, but under the prerequisite of repeater introducing, this mode is infeasible, and the 3GPP standard does not provide feasible scheme yet.
As shown in Figure 2, in some travelling carriage designs, for amount of calculation and the circuit design that reduces this part, the mid point (C point) that emission measure is positioned at GP will initially be shifted to an earlier date, after travelling carriage is launched for the first time, wait for (waiting for that default value is that 4 subframes are 20ms), if do not respond, to continue emission in advance in the position of GP mid point so, step-length is certain value (default value is 1chips) in advance, stops (arriving the A point from the emission of C point) until obtain the response of base station, does not also respond if reach the network design limit at lead, then think access failure, restart or abandon.
As long as from above we can correctly recognize once the travelling carriage UPPTS base station of sending as can be seen, the UpPTS mission in its uplink synchronous process just is through with.
The repeater can adopt any a kind of scheme except that level triggers synchronously.Obtain with the base station synchronously after, the up-downgoing of repeater is switched and is divided into two kinds of different switchings and carries out: first kind allow travelling carriage obtain base station down synchronously, allow DWPTS pass through to amplify output; Second kind be allow the base station obtain with travelling carriage up synchronously, original DWPTS period is opened as up link, close at down link.
As shown in Figure 3, we are called A condition with first kind of state, this state is the action of first subframe after confirming to obtain synchronous (synchronous preceding repeater is in closed condition): with the zero hour that switching point D places GP, make DWPTS by complete the passing through of descending amplification link.After A condition was carried out N subframe continuously, the repeater entered next action.The N value can be set, and default value is 4, and this value can be set between 4-30, and the N value can be used as a parameter and sets in the network optimization of repeater.
We are called the B state with second kind of state, and this state is the action after an A condition N continuous subframe: switching point is placed the DWPTS zero hour, i.e. the switching point D of A condition reach 96chips.After the B state was carried out M subframe continuously, and then N subframe carried out A condition, carries out do action.The M value is the same with the N value, sets (default value is 1, and maximum is 30) as a network optimization parameter.We are called AB circulation switching controls.
After this optimization means, the transmission range of repeater and base station can reach 96 chips, and promptly 22.5 kilometers, we consider that UPPTS also has the rearmounted GP of 32chips, and the limit can reach 112chips.Consider the equipment delay and the covering radius of repeater, can estimate zooming out of repeater and base station and can reach 20 kilometers (13 kilometers of optical fiber) apart from (in the air).
Claims (6)
1. remote relaying implementation method in TD-SCDMA repeater, it is characterized in that: this method comprises the steps:
The a.TD-SCDMA repeater obtains the descending pilot frequency synchronization point, and acquisition is synchronous with the base station, learns second position of conversion point by network or artificial the setting simultaneously;
N subframe will be carried out continuously in the b.TD-SCDMA repeater after obtaining synchronously, promptly carry out the action of A condition;
M subframe will be carried out again continuously in the c.TD-SCDMA repeater after A condition finishes, promptly carry out the action of B state;
D. after the B state finished, the TD-SCDMA repeater changed A condition again automatically over to, and the repeater is constantly samsara execution in two states.
2. the remote relaying implementation method in TD-SCDMA according to claim 1 repeater is characterized in that: described a step, any mode except that level triggers of using synchronously of repeater triggers.
3. the remote relaying implementation method in TD-SCDMA according to claim 1 repeater is characterized in that: described b step, and carry out A condition and obtain allowing the synchronous of travelling carriage and base station down, it is characterized by the zero hour that first switching point is GP.
4. the remote relaying implementation method in TD-SCDMA according to claim 1 repeater is characterized in that: described b step, the execution frame number N of A condition is a variable, scope can more than or equal to 4 with select smaller or equal to 30 integer range.
5. the remote relaying implementation method in TD-SCDMA according to claim 1 repeater is characterized in that: described c step, and carry out the B state and obtain allowing up synchronous of base station and travelling carriage, it is characterized by the zero hour that first switching point is DWPTS.
6. the remote relaying implementation method in TD-SCDMA according to claim 1 repeater is characterized in that: described c step, the execution frame number M of B state is a variable, scope can more than or equal to 1 with select smaller or equal to 30 integer range.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103379653A (en) * | 2012-04-27 | 2013-10-30 | 中兴通讯股份有限公司 | Method and device for indicating TD-LTE terminal to receive downlink pilot time slot |
| CN103918343A (en) * | 2011-11-04 | 2014-07-09 | 三菱电机株式会社 | Mobile communication system |
| CN106160866A (en) * | 2016-09-28 | 2016-11-23 | 成都奥克特科技有限公司 | Optical fiber repeater branch transmission method and by-passing type optical fiber repeater |
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| CN100563127C (en) * | 2005-04-19 | 2009-11-25 | 大唐移动通信设备有限公司 | A Method of Initial Uplink Synchronization in Time Division Synchronous Code Division Multiple Access System |
| CN100399731C (en) * | 2005-06-02 | 2008-07-02 | 武汉虹信通信技术有限责任公司 | The Method of Obtaining the Position Information of Switching Point by Time Division Synchronous Code Division Multiple Access Repeater |
| CN100377511C (en) * | 2005-06-02 | 2008-03-26 | 武汉虹信通信技术有限责任公司 | Method and system for realizing uplink and downlink switching in time division synchronous code division multiple access repeater |
| CN1917407B (en) * | 2005-08-17 | 2011-07-20 | 展讯通信（上海）有限公司 | TD SCDMA system communication method |
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| CN103918343A (en) * | 2011-11-04 | 2014-07-09 | 三菱电机株式会社 | Mobile communication system |
| CN103918343B (en) * | 2011-11-04 | 2018-11-09 | 三菱电机株式会社 | Mobile communication system |
| US10609602B2 (en) | 2011-11-04 | 2020-03-31 | Mitsubishi Electric Corporation | Mobile communication system |
| CN103379653A (en) * | 2012-04-27 | 2013-10-30 | 中兴通讯股份有限公司 | Method and device for indicating TD-LTE terminal to receive downlink pilot time slot |
| CN103379653B (en) * | 2012-04-27 | 2016-05-25 | 中兴通讯股份有限公司 | Instruction TD-LTE terminal receives the method and apparatus of descending pilot frequency time slot |
| CN108352939A (en) * | 2015-10-29 | 2018-07-31 | 瑞典爱立信有限公司 | Extend the timer for spreading over |
| CN108352939B (en) * | 2015-10-29 | 2021-06-15 | 瑞典爱立信有限公司 | Communication device, core network node and method for determining an extended period |
| CN106160866A (en) * | 2016-09-28 | 2016-11-23 | 成都奥克特科技有限公司 | Optical fiber repeater branch transmission method and by-passing type optical fiber repeater |
| CN106160866B (en) * | 2016-09-28 | 2018-09-28 | 嵊州市万智网络科技有限公司 | Optical fiber repeater branch transmission method and by-passing type optical fiber repeater |
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