CN101090291A - Method for inhibiting interference from TD-SCDMA downlink pilot to uplink pilot - Google Patents
Method for inhibiting interference from TD-SCDMA downlink pilot to uplink pilot Download PDFInfo
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- CN101090291A CN101090291A CNA2006100122536A CN200610012253A CN101090291A CN 101090291 A CN101090291 A CN 101090291A CN A2006100122536 A CNA2006100122536 A CN A2006100122536A CN 200610012253 A CN200610012253 A CN 200610012253A CN 101090291 A CN101090291 A CN 101090291A
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Abstract
This invention relates to a method for suppressing interference to up-line pilot from TD-SCDMA down-line pilot frequencies including: taking continuous N-sub-frames as a period, and N is a natural number greater than 4, a base station emits down-line pilot frequency in the time slot of the first four sub-frames in each period without emitting them in the latter N-4 sub-frames, all base stations are synchronized according to said period to emit dow pilot frequencirs at the same time or will not emit them at the same time.
Description
Technical field
The present invention relates to the time division duplex mobile communication technology, particularly relate to the method that a kind of TD-SCDMA of inhibition descending pilot frequency disturbs ascending pilot frequency.
Background technology
In the TD-SCDMA mobile communication system, adopted time division duplex (TDD) mode, uplink and downlink of signals was distinguished by the time, and had designed special-purpose uplink and downlink pilot time slot, sent the uplink and downlink pilot signal, finished the function of uplink and downlink pilot tone.
As shown in Figure 1, the subframe structure that is adopted for the TD-SCDMA mobile communication system.According to the regulation of 3GPP standard to TDD (1.28M spreading rate) frame structure, the radio frames of 1 10ms can be divided into the subframe of two 5ms, and each subframe is made up of 7 conventional time slots (TS0-TS6) and 3 special time slots.3 special time slots comprise respectively, descending pilot frequency time slot DwPTS (96 chip), with and subsequent protection at interval GP (96 chip) and uplink pilot time slot UpPTS (160 chip).In descending pilot frequency time slot and uplink pilot time slot, send down-bound pilot frequency signal and uplink pilot signal respectively, to finish down-going synchronous and uplink synchronous respectively.
Utilize the protection of design between uplink and downlink GP at interval in the prior art, distinguish and the interference between up-downgoing is protected with the time interval.Yet in fact, protection at interval GP can not avoid interference between all up-downgoing.Downlink pilot frequency channel (DwPCH) has carried the transmission of descending pilot frequency synchronous code; to finish the function of identifying cells by doing down-bound pilot frequency signal; need realize covering to whole sub-district; thereby require to adopt bigger power and continue emission (SYNC DL sign indicating number); this signal can produce echo and disturb (referring to send the interference that the echo of signal produces to received signal) in certain distance range; though this echo disturbs and mainly concentrates on the GP interval; but still can disturb uplink pilot time slot behind the GP at interval in protection, promptly down-bound pilot frequency signal has produced the echo interference that can not be ignored.In addition, the down-bound pilot frequency signal of telepoint base station will propagate into the local terminal base station, will disturb the reception of uplink pilot signal with the echo of the down-bound pilot frequency signal of this sub-district, reduce the up success rate of portable terminal.
The situation that is subjected to the interference of descending pilot frequency for fear of ascending pilot frequency takes place, and exists in the prior art to allow the base station by subframe sequence number the odd even emission or the technical scheme of transmitting downstream pilot tone not in turn.For example CN200410057202.6 " interference elimination method of downlink pilot frequency channel " promptly discloses, transmitting downstream pilot tone when the descending pilot frequency time slot of odd number subframe, transmitting downstream pilot tone not when the descending pilot frequency of even number subframe.This is the subframe method for transmitting at interval, though the opportunity of the up-downgoing pilot signal transmission that can stagger to a certain extent, play certain effect that uplink synchronous is disturbed avoided, but this with existing 3GPP technical specification TS25.223 in indicate in following four subframes with the phase place of four continuous descending pilot frequencies and to have or not the requirement of P-CCPCH not conform to.In addition, CN200410057202.6 requires portable terminal only to carry out the ascending pilot frequency transmission on the uplink pilot time slot in the subframe that does not have downlink pilot frequency channel to send.
Regulation according to 3GPP technical specification 25.223, the base station is when the transmitting downstream pilot tone, demarcate in next four subframes with the phase place of descending pilot frequency whether P-CCPCH is arranged, concrete norm comprises: in the descending pilot frequency time slot of four continuous subframes, the base station descending pilot frequency, if the phase place type of these four continuous descending pilot frequencies is S1, promptly the phase place of four continuous descending pilot frequencies is followed successively by 135 degree, 45 degree, 225 degree, 135 degree, and then indicating in four subframes of back has a P-CCPCH; If the phase place type of these four continuous descending pilot frequencies is S2, promptly the phase place of four continuous descending pilot frequencies is followed successively by 315 degree, 225 degree, 315 degree, 45 degree, and then indicating in four subframes of back does not have P-CCPCH.
So scheme that odd even is launched or do not launched in turn in the prior art, can not in four subframes, launch four descending pilot frequencies continuously, also just can not indicate in four subframes of back whether have P-CCPCH with the type of the descending pilot frequency phase place in four continuous subframes.Do not meet the regulation of 3GPP technical specification 25.223.
Summary of the invention
Technical problem to be solved by this invention is; the method that provides a kind of TD-SCDMA of inhibition descending pilot frequency that ascending pilot frequency is disturbed; make part protection interval and uplink pilot time slot, avoid the interference of descending pilot frequency this sub-district emission and the emission of adjacent sub-district, improve the success rate of uplink synchronous.
To achieve these goals, the invention provides a kind of TD-SCDMA of inhibition descending pilot frequency, be applied to comprise the steps: in the TD-SCDMA communication system the method that ascending pilot frequency disturbs
With a continuous N subframe is one-period, and wherein N is the natural number greater than 4; The base station is transmitting downstream pilot tone in the descending pilot frequency time slot of preceding 4 subframes in each cycle respectively, and transmitting downstream pilot tone not in the descending pilot frequency time slot of N-4 subframe in the back.
Described method comprises that also all base stations were carried out synchronously according to the described cycle, emission simultaneously or transmitting downstream pilot tone not simultaneously.
Described method comprises that further portable terminal can carry out ascending pilot frequency and send on the uplink pilot time slot in all subframes.
The present invention makes part protection interval and uplink pilot time slot; avoid interference this sub-district emission and the descending pilot frequency emission of adjacent sub-district; improved the success rate of uplink synchronous simultaneously; and meet in the 3GPP technical specification 25.223 phase place type S1 fully with four continuous descending pilot frequencies; S2 indicates the regulation that whether has P-CCPCH in four subframes of back; simultaneously, portable terminal can carry out the ascending pilot frequency transmission on the uplink pilot time slot in all subframes.
Description of drawings
Fig. 1 is the subframe structure schematic diagram of TD-SCDMA;
Fig. 2 is the flow chart of inhibition TD-SCDMA descending pilot frequency of the present invention to the method for ascending pilot frequency interference;
Fig. 3 is the schematic diagram of the one-period of an embodiment of the present invention.
Embodiment
Describe feature of the present invention in detail below in conjunction with embodiment and accompanying drawing.
Fig. 2 is the flow chart of inhibition TD-SCDMA descending pilot frequency of the present invention to the method for ascending pilot frequency interference, and as shown in the figure, the present invention is an one-period with the subframe group that continuous N TD-SCDMA subframe constitutes, and wherein N is the natural number (step 201) greater than 4.And the base station is at the descending pilot frequency time slot of preceding 4 subframes in each cycle, transmitting downstream pilot tones all, and its transmitting power is a constant.At the descending pilot frequency time slot of N-4 the subframe in the back in each cycle, transmitting downstream pilot tones (step 202) not.All base stations are all according to top cycle synchronisation, and transmitting downstream pilot tone, or while simultaneously is the transmitting downstream pilot tone not.
Adopt the present invention, portable terminal can carry out ascending pilot frequency and send on the uplink pilot time slot in the subframe that does not have downlink pilot frequency channel to send, also can carry out ascending pilot frequency on the uplink pilot time slot in the subframe that has descending pilot frequency to send and send.Referring to Fig. 3 is the schematic diagram of the one-period of an embodiment of the present invention, and in the present embodiment, N is chosen to be 8, is a kind of typical case of the present invention, and selected certainly other integers greater than 4 also can.Comprise 8 subframes (subframe 1-subframe 8) in the one-period, all base stations are except according to the synchronizing sub-frame, the cycle synchronisation of forming by 8 subframes also, promptly all base stations begin one-period simultaneously, and all base stations first cycle in one day is when all starting from Beijing time zero.
The base station covers the descending pilot frequency of this sub-district with the constant power emission in the descending pilot frequency time slot of the subframe 1-in each cycle subframe 4, and in the descending pilot frequency time slot of the subframe 5-in each cycle subframe 8 transmitting downstream pilot tone not.In application, portable terminal is initiated uplink synchronous at random, wherein, as at a time when the base station subframe of transmitting downstream pilot tone not then can not be subjected to the interference of descending pilot frequency, successfully realizes uplink synchronous; Even run into the subframe of base station descending pilot frequency, when causing this uplink synchronous to get nowhere, also can postpone a period of time immediately because of the interference that is subjected to descending pilot frequency, carry out again synchronously.The arrangement in cycle of the present invention can make part protection interval and uplink pilot time slot, avoids the interference of descending pilot frequency this sub-district emission and the emission of adjacent sub-district, guarantees successfully to realize within a short period of time uplink synchronous simultaneously.And support in the 3GPP technical specification 25.223 to demarcate the regulation whether P-CCPCH is arranged in next four subframes with the phase place of the descending pilot frequency of 4 continuous subframes.
Its concrete implementation procedure is, portable terminal is made as 8 in the value of the value Signature Re-Transmission Counter of the signature retransmission counter of the uplink synchronous that once inserts at random, and this parameter is given portable terminal by broadcast channel broadcasts.Portable terminal is at a time launched ascending pilot frequency, supposes to cause the uplink synchronous failure because of the subframe that just is in the transmitting downstream pilot tone is interfered.At this moment, the value of signature retransmission counter subtracts 1, reattempt behind the random delay next time synchronously.Every uplink synchronous is failed once, and the value of signature retransmission counter subtracts 1, and when being kept to 0, access at random this time stops.And the probability that runs into the subframe of transmitting downstream pilot tone each time is 4/8, promptly 0.5, run into certainly not that the probability of the subframe of transmitting downstream pilot tone also is 0.5, and promptly initiate uplink synchronous each time and the probability of succeeing is 0.5.Suppose that portable terminal is owing to the subframe that runs into the transmitting downstream pilot tone has been attempted uplink synchronous 8 times always, because it is independent separately synchronously at every turn, so the subframe of the emission ascending pilot frequency probability of transmitting downstream pilot tone always should be 0.58, promptly 0.00390625, such probability is very little.The success rate of portable terminal uplink synchronous is very high like this.
By foregoing description as can be known, technical scheme of the present invention can reduce the interference of descending pilot frequency to uplink synchronous, makes when initiating the part uplink synchronous, can avoid the interference of descending pilot frequency, even be interfered, also can be at less initiation number of times with in the short period, the uplink synchronous of achieving success.Simultaneously, support the relevant regulations of 25.223 technical specifications among the 3GPP.
The various embodiments described above are only in order to illustrate characteristics of the present invention, make those of ordinary skill in the art can understand content of the present invention and enforcement according to this, be not to be used to limit scope of the present invention, the equivalent modifications of dying all not departing from the scope of the present invention and finishing still is included in claims of the following stated.
Claims (4)
1, a kind of TD-SCDMA descending pilot frequency that suppresses is used for the TD-SCDMA communication system to the method that ascending pilot frequency disturbs, and it is characterized in that, comprises the steps:
With a continuous N subframe is one-period, and wherein N is the natural number greater than 4;
The base station is transmitting downstream pilot tone in the descending pilot frequency time slot of preceding 4 subframes in each cycle respectively, and transmitting downstream pilot tone not in the descending pilot frequency time slot of N-4 subframe in the back.
2, the method for claim 1 is characterized in that, carried out synchronously according to the described cycle all base stations, emission simultaneously or transmitting downstream pilot tone not simultaneously.
3, the method for claim 1 is characterized in that, the value of N is 8.
4, the method for claim 1 is characterized in that, further comprises, portable terminal can carry out ascending pilot frequency and send on the uplink pilot time slot in all subframes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100122536A CN101090291A (en) | 2006-06-14 | 2006-06-14 | Method for inhibiting interference from TD-SCDMA downlink pilot to uplink pilot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100122536A CN101090291A (en) | 2006-06-14 | 2006-06-14 | Method for inhibiting interference from TD-SCDMA downlink pilot to uplink pilot |
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| CN101090291A true CN101090291A (en) | 2007-12-19 |
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| CNA2006100122536A Pending CN101090291A (en) | 2006-06-14 | 2006-06-14 | Method for inhibiting interference from TD-SCDMA downlink pilot to uplink pilot |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010015206A1 (en) * | 2008-08-07 | 2010-02-11 | 大唐移动通信设备有限公司 | Method and apparatus for determining resources usage mode of cells |
| WO2013063939A1 (en) * | 2011-11-04 | 2013-05-10 | 中兴通讯股份有限公司 | Method and system for suppressing out-of-band leakage interference |
| CN110870268A (en) * | 2017-07-10 | 2020-03-06 | 株式会社Ntt都科摩 | User terminal and wireless communication method |
| CN111147214A (en) * | 2018-11-02 | 2020-05-12 | 中国移动通信有限公司研究院 | Sending method of uplink signal, information indicating method, terminal and network equipment |
-
2006
- 2006-06-14 CN CNA2006100122536A patent/CN101090291A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010015206A1 (en) * | 2008-08-07 | 2010-02-11 | 大唐移动通信设备有限公司 | Method and apparatus for determining resources usage mode of cells |
| WO2013063939A1 (en) * | 2011-11-04 | 2013-05-10 | 中兴通讯股份有限公司 | Method and system for suppressing out-of-band leakage interference |
| CN110870268A (en) * | 2017-07-10 | 2020-03-06 | 株式会社Ntt都科摩 | User terminal and wireless communication method |
| CN111147214A (en) * | 2018-11-02 | 2020-05-12 | 中国移动通信有限公司研究院 | Sending method of uplink signal, information indicating method, terminal and network equipment |
| CN111147214B (en) * | 2018-11-02 | 2022-08-23 | 中国移动通信有限公司研究院 | Sending method of uplink signal, information indicating method, terminal and network equipment |
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Application publication date: 20071219 |