CN1741423A - Method for eliminating interference of downgoing pilot channel - Google Patents
Method for eliminating interference of downgoing pilot channel Download PDFInfo
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- CN1741423A CN1741423A CNA2004100572026A CN200410057202A CN1741423A CN 1741423 A CN1741423 A CN 1741423A CN A2004100572026 A CNA2004100572026 A CN A2004100572026A CN 200410057202 A CN200410057202 A CN 200410057202A CN 1741423 A CN1741423 A CN 1741423A
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- pilot frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- Computer Networks & Wireless Communication (AREA)
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Abstract
A method for eliminating interference of down link pilot channel includes carrying out down link pilot channel transmission by base station at interval time slot of subframe down link pilot and carrying out up link pilot channel transmission by mobile terminal at up link pilot time slot in subframe with out down link pilot channel transmission i.e using odd number of subframe to transmit down link pilot and using even number of subframe to transmit up link pilot .
Description
Technical field
The present invention relates to the time division duplex mobile communication technology, relate to a kind of removing method that downlink pilot frequency channel (DwPCH) disturbs ascending pilot channel in the synchronous code division multiple access TD-SCDMA mobile communication system of time-division one or rather.
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, be the frame structure that present TD-SCDMA mobile communication system is adopted.At each subframe (subframe; 1.28Mcps, 5ms, 6400 chips) in; 7 conventional time slot TS0 one TS6 and 3 special time slots are arranged, and 3 special time slots comprise: descending pilot frequency time slot DwPTS (96 chip), uplink pilot time slot UpPTS (160 chip) and protection be GP (96 chip) at interval.In descending pilot frequency time slot and uplink pilot time slot, send down-bound pilot frequency signal and uplink pilot signal respectively; be respectively applied for and finish down-going synchronous and uplink synchronous, the middle protection interval GP (transfer point shown in the figure 1) that is positioned between the up-downgoing pilot time slot finishes the guardtime that up-downgoing is changed.Up-downgoing transfer point 2 is arranged between TS3 shown in the figure and TS4.
In descending pilot frequency time slot (DwPTS), downlink pilot frequency channel (DwPCH) is arranged, on this channel, send descending pilot frequency (SYNC_DL) sign indicating number synchronously, be used to finish functions such as down-going synchronous, Cell searching.In uplink pilot time slot (UpPTS), ascending pilot channel (UpPCH) is arranged, on this channel, send ascending pilot frequency (SYNC_UL) sign indicating number synchronously, finish uplink synchronous, function such as access at random.
Adopt the mobile communication system of time division duplex; identical working frequency range is adopted in its uplink and downlink; up-downgoing is by special-purpose subframe structure shown in Figure 1, utilizes the protection of design between uplink and downlink GP at interval, distinguishes and the interference between up-downgoing is protected with the time interval.Yet in fact, the protection impossible interference of protecting between all up-downgoings of GP at interval, such as, to very important down-bound pilot frequency signal in the system.Downlink pilot frequency channel (DwPCH) has carried the transmission of descending pilot frequency synchronous code; because down-bound pilot frequency signal will be finished the function of identifying cells; 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, also be that 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.
Show the base station receiver place, downlink pilot frequency channel (DwPCH) can receive the signal of ascending pilot channel (UpPCH) and cause interference, the echo that in other words can be subjected to self down-bound pilot frequency signal the receiving uplink pilot signals of base station the time disturbs and the down-bound pilot frequency signal of telepoint base station is disturbed, thereby makes the ability drop of base station reception, demodulation uplink pilot signal (SYNC_UL sign indicating number).The base station is in order to guarantee to finish preferably the demodulation to ascending pilot channel (UpPCH), receives preferably and the demodulation uplink pilot signal, and the echo that must offset self down-bound pilot frequency signal as much as possible disturbs with the down-bound pilot frequency signal of telepoint base station and disturbs.Thereby some technology for eliminating have been produced at echo interference and telepoint base station interference.
Common a kind of solution is by the base station echo talker of down-bound pilot frequency signal and the down-bound pilot frequency signal of telepoint base station to be estimated, calculated, according to estimation, result calculated, in the uplink pilot signal that receives, this interference is deducted, and then carry out the detection of uplink pilot signal synchronous code (SYNC_UL).Though it is common but realize more complicated that this kind carries out the method for Interference Estimation, calculating and counteracting by the base station, comprise that the base station is estimated, the calculation process complexity, need take certain processing capacity, and the performance of Interference Cancellation is subjected to the restriction of specific algorithm to a great extent.
Another kind of implementation method is the Timing Advance that limiting terminal (UE) sends uplink pilot signal synchronous code (SYNC_UL), and base station (Node B) only detects the received signal on the uplink pilot time slot (UpPTS).Because the echo of downlink pilot frequency channel disturbs and the downlink pilot frequency channel interference of telepoint base station mainly concentrates on the GP interval, if regulation UE is sending SYNC_UL based on UE UpPTS original position regularly, when UE was in the scope of distance base station 3.75km, the SYNC_UL coded signal will be less than influence to the Traffic Channel on the time slot TS1 (DCH).When Node B detects SYNC_UL, can only detect the signal on the UpPTs and do not consider signal on the GP, so just can eliminate the influence of most DwPCH interference basically.The benefit of this method is to realize simply can effectively suppressing the influence that DwPCH disturbs under most of situation.Shortcoming be, terminal bigger when radius of society apart from base station distant (when surpassing 3.75km), the Timing Advance that restriction UE sends SYNC_UL can influence the business on the TS1 time slot, this be system do not wish to occur.In addition, the down-bound pilot frequency signal of telepoint base station tends to drop among the UpPTS, and restriction UE sends the method for signal lead also can't offset these interference.
Summary of the invention
The objective of the invention is to design a kind of interference elimination method of downlink pilot frequency channel, in the TD-SCDMA mobile communication system, the echo of the downlink pilot frequency channel of local terminal base station (DwPCH) disturbs and the down-bound pilot frequency signal of telepoint base station is disturbed a kind of new cancellation scheme of proposition, be easy to realize and need not the Timing Advance that limiting terminal (UE) sends uplink pilot signal synchronous code (SYNC_UL), and can not influence the business on the TS1 time slot.
The technical scheme that realizes the object of the invention is such: a kind of interference elimination method of downlink pilot frequency channel is characterized in that:
The base station is carried out downlink pilot frequency channel at interval and is sent on the descending pilot frequency time slot of subframe; Carrying out ascending pilot channel on the uplink pilot time slot of portable terminal in the subframe that does not have downlink pilot frequency channel to send sends.
Described downlink pilot frequency channel sends with ascending pilot channel and sends, and the base station carries out that downlink pilot frequency channel sends and portable terminal carries out ascending pilot channel at the uplink pilot time slot of even number subframe and sends at the descending pilot frequency time slot of odd number subframe.
Described downlink pilot frequency channel sends with ascending pilot channel and sends, and the base station carries out that downlink pilot frequency channel sends and portable terminal carries out ascending pilot channel at the uplink pilot time slot of odd number subframe and sends at the descending pilot frequency time slot of even number subframe.
Described downlink pilot frequency channel sends with ascending pilot channel and sends, be by radio network controller to the uplink and downlink pilot channel send carry out pre-configured, the base station is carried out described downlink pilot frequency channel according to this configuration space ground and is sent, and portable terminal is according to the transmission of this configuration and the downlink pilot frequency channel ascending pilot channel transmission that hockets.
The present invention proposes a kind of interference elimination method of downlink pilot frequency channel for the TD-SCDMA mobile communication system, be that the up-downgoing pilot channel carries out at interval, alternately sends, with the down-bound pilot frequency signal of the down-bound pilot frequency signal echo avoiding sending and telepoint base station the uplink pilot signal that receives produced and disturb.
The inventive method is in the TD-SCDMA system, and the scheme by configuration up-downgoing pilot tone in radio network controller (RNC) sends can adopt different up-downgoing pilot tone delivery plans according to this configuration.As long as this scheme embodies: the discontinuous transmission down-bound pilot frequency signal in base station; Terminal only just sends uplink pilot signal when not having down-bound pilot frequency signal to send; The up-downgoing pilot signal alternately sends.
Typically, can send down-bound pilot frequency signal at the DwPCH of the odd number subframe of system, UpPCH in the even number subframe of system sends uplink pilot signal, the 5ms that is spaced apart owing to down-bound pilot frequency signal and uplink pilot signal, can reach fully and eliminate the purpose that echo disturbs and the down-bound pilot frequency signal of telepoint base station is disturbed, and need not the Timing Advance that limiting terminal (UE) sends uplink pilot signal synchronous code (SYNC_UL), thereby can not influence the business on the TS1 time slot.
The present invention is to the improvement of existing TD-SCDMA mobile communication system technology and perfect, compare with the DwPCH interference elimination method that present standard TD-SCDMA system adopts, the scheme that DwPCH among employing the present invention and UpPCH send at interval, can effectively solve in the TDD cell mobile communication systems, because up-downgoing is in same frequency range, the problem that the down-bound pilot frequency signal of DwPCH echo and telepoint base station disturbs UpPCH to receive, do not increase any extra cost and complexity, also improved the accuracy of the detection UpPCH of system greatly.
Description of drawings
Fig. 1 is a TD-SCDMA mobile communication system up-downgoing pilot time slot configuration schematic diagram.
Embodiment
The inventive method discloses in the TD-SCDMA system to be disturbed and a kind of method of the down-bound pilot frequency signal interference eliminated of telepoint base station the DwPCH echo.The core of this method is the transmitting time of the uplink and downlink pilot tone synchronous code of control UpPCH of system and DwPCH, the method that UpPCH that adopts in different subframes and DwPCH alternately send.Send descending synchronous code as the downlink pilot frequency channel DwPCH in the descending pilot frequency time slot DwPTS of system's odd number subframe, ascending pilot channel UpPCH in the uplink pilot time slot UpPTS of system's even number subframe sends uplink synchronous code, and (vice versa, downlink pilot frequency channel DwPCH in the descending pilot frequency time slot DwPTS of system's even number subframe sends descending synchronous code, ascending pilot channel UpPCH in the uplink pilot time slot UpPTS of system's odd number subframe sends uplink synchronous code, perhaps adopts any interval also alternately to send the way of up-downgoing pilot channel).Can thoroughly eliminate of the interference of the DwPCH echo of same frequency range like this to UpPCH.
The present invention proposes to adopt DwPCH and UpPCH to replace the method that sends at interval, can thoroughly avoid the interference of the down-bound pilot frequency signal of DwPCH echo and telepoint base station to UpPCH, realizes reception and demodulation to UpPCH, and the good detection performance is arranged.
During realization, terminal can be discerned the base station by detecting DwPTS, detects DwPTS as the method for asking relevant peaks with tradition use at present.No matter system adopts is the present scheme that sends the descending pilot frequency synchronous code at the DwPCH of each subframe continuously, still adopt the scheme that sends the descending pilot frequency synchronous code in the DwPCH compartment of terrain of interval subframe of the present invention, terminal can detect DwPTS with the method for asking relevant peaks, and calculates the time that sends UpPCH according to the result of detected DwPTS.
If DwPCH sends (delivery plan is disposed by radio network controller at interval) at interval, such as, the DwPCH that is configured at the odd number subframe DwPTS of system sends down-bound pilot frequency signal, so when terminal need send ascending pilot frequency synchronous (SYNC_UL) sign indicating number, terminal can not be used the odd number subframe, and promptly terminal can only be selected in the even number subframe UpPTS time slot to carry out UpPCH to send.
So the interval of DwPCH that realizes and UpPCH sends, can eliminate the influence of echo interference and the down-bound pilot frequency signal of elimination telepoint base station very effectively disturbs, and do not increase extra implementation complexity, but need existing Cell searching algorithm is carried out certain modification.
Method of the present invention is in the TD-SCDMA mobile communication system, uses configurable up-downgoing pilot sending method, and DwPCH and UpPCH are sent at the subframe interbody spacer.Typically, be odd number subframe transmission descending pilot frequency in system, the even number subframe transmission ascending pilot frequency in system.Guarantee that the base station can receive and the demodulation uplink pilot signal under the situation that the down-bound pilot frequency signal of no descending pilot frequency echo interference and telepoint base station is disturbed.
Claims (4)
1. the interference elimination method of a downlink pilot frequency channel is characterized in that: the base station is carried out downlink pilot frequency channel at interval and is sent on the descending pilot frequency time slot of subframe; Carrying out ascending pilot channel on the uplink pilot time slot of portable terminal in the subframe that does not have downlink pilot frequency channel to send sends.
2. method according to claim 1, it is characterized in that: described downlink pilot frequency channel sends with ascending pilot channel and sends, the base station carries out that downlink pilot frequency channel sends and portable terminal carries out ascending pilot channel at the uplink pilot time slot of even number subframe and sends at the descending pilot frequency time slot of odd number subframe.
3. method according to claim 1, it is characterized in that: described downlink pilot frequency channel sends with ascending pilot channel and sends, the base station carries out that downlink pilot frequency channel sends and portable terminal carries out ascending pilot channel at the uplink pilot time slot of odd number subframe and sends at the descending pilot frequency time slot of even number subframe.
4. method according to claim 1, it is characterized in that: described downlink pilot frequency channel sends with ascending pilot channel and sends, be by radio network controller to the uplink and downlink pilot channel send carry out pre-configured, the base station is carried out described downlink pilot frequency channel according to this configuration space ground and is sent, and portable terminal is according to the transmission of this configuration and the downlink pilot frequency channel ascending pilot channel transmission that hockets.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100572026A CN1741423A (en) | 2004-08-23 | 2004-08-23 | Method for eliminating interference of downgoing pilot channel |
| PCT/CN2005/001314 WO2006021145A1 (en) | 2004-08-23 | 2005-08-23 | Downlink pilot channel interfere eliminating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100572026A CN1741423A (en) | 2004-08-23 | 2004-08-23 | Method for eliminating interference of downgoing pilot channel |
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| Publication Number | Publication Date |
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| CN1741423A true CN1741423A (en) | 2006-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2004100572026A Pending CN1741423A (en) | 2004-08-23 | 2004-08-23 | Method for eliminating interference of downgoing pilot channel |
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| CN (1) | CN1741423A (en) |
| WO (1) | WO2006021145A1 (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008014672A1 (en) * | 2006-07-27 | 2008-02-07 | Zte Corporation | Transmitting method for asynchronism random access pilot signal |
| WO2009079830A1 (en) * | 2007-12-18 | 2009-07-02 | Zte Corporation | An optimization method of uppch interference measurement |
| CN101162982B (en) * | 2006-10-12 | 2010-05-12 | 中兴通讯股份有限公司 | TDD communication system and frame structure selecting method thereof |
| CN101079665B (en) * | 2006-05-23 | 2010-08-11 | 大唐移动通信设备有限公司 | A method for expanding coverage scope of time-division duplex system |
| CN101212797B (en) * | 2006-12-29 | 2010-08-25 | 大唐移动通信设备有限公司 | Uplink pilot time slot position adjusting method and radio network controller |
| CN101162981B (en) * | 2006-10-12 | 2010-09-08 | 中兴通讯股份有限公司 | Frame structure generating method of TDD communication system |
| CN101119154B (en) * | 2006-08-04 | 2011-05-11 | 华为技术有限公司 | Communication method and device of TDD mode |
| CN101110630B (en) * | 2006-07-19 | 2011-06-29 | 鼎桥通信技术有限公司 | Method and apparatus for eliminating time slot signal disturbance of descending pilot frequency |
| CN101137135B (en) * | 2006-09-01 | 2011-06-29 | 电信科学技术研究院 | Base station and method for transmitting control scheduling information |
| CN101174882B (en) * | 2006-11-01 | 2012-07-04 | 中兴通讯股份有限公司 | Pilot signal transmitting method |
| CN101136677B (en) * | 2006-08-28 | 2013-01-30 | 北京信威通信技术股份有限公司 | TDD system base station disturbance null method and system |
| 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 |
| CN101771432B (en) * | 2008-12-26 | 2013-06-05 | 中兴通讯股份有限公司 | Demodulation method and system used in hybrid transmission of uplink pilot signal and service signal |
| CN103368713A (en) * | 2012-03-26 | 2013-10-23 | 中兴通讯股份有限公司 | Device-to-device communication method and device |
| US8639996B2 (en) | 2008-07-11 | 2014-01-28 | Qualcomm Incorporated | Systems and methods for uplink inter-cell interference cancellation using hybrid automatic repeat request (HARQ) retransmissions |
| US8867999B2 (en) | 2009-01-26 | 2014-10-21 | Qualcomm Incorporated | Downlink interference cancellation methods |
| WO2015078009A1 (en) * | 2013-11-29 | 2015-06-04 | 华为技术有限公司 | Method and device for reducing self-interference signal of communication system |
| US9119212B2 (en) | 2008-07-11 | 2015-08-25 | Qualcomm Incorporated | Inter-cell interference cancellation framework |
| CN112039570A (en) * | 2020-08-13 | 2020-12-04 | 上海道生物联技术有限公司 | Pilot frequency sending and detecting method, sending end and receiving end |
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| AU758861B2 (en) * | 2000-11-17 | 2003-04-03 | Samsung Electronics Co., Ltd. | Apparatus and method for measuring propagation delay in an NB-TDD CDMA mobile communication system |
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-
2004
- 2004-08-23 CN CNA2004100572026A patent/CN1741423A/en active Pending
-
2005
- 2005-08-23 WO PCT/CN2005/001314 patent/WO2006021145A1/en active Application Filing
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| CN101079665B (en) * | 2006-05-23 | 2010-08-11 | 大唐移动通信设备有限公司 | A method for expanding coverage scope of time-division duplex system |
| CN101110630B (en) * | 2006-07-19 | 2011-06-29 | 鼎桥通信技术有限公司 | Method and apparatus for eliminating time slot signal disturbance of descending pilot frequency |
| WO2008014672A1 (en) * | 2006-07-27 | 2008-02-07 | Zte Corporation | Transmitting method for asynchronism random access pilot signal |
| CN101119154B (en) * | 2006-08-04 | 2011-05-11 | 华为技术有限公司 | Communication method and device of TDD mode |
| CN101136677B (en) * | 2006-08-28 | 2013-01-30 | 北京信威通信技术股份有限公司 | TDD system base station disturbance null method and system |
| CN101137135B (en) * | 2006-09-01 | 2011-06-29 | 电信科学技术研究院 | Base station and method for transmitting control scheduling information |
| CN101162982B (en) * | 2006-10-12 | 2010-05-12 | 中兴通讯股份有限公司 | TDD communication system and frame structure selecting method thereof |
| CN101162981B (en) * | 2006-10-12 | 2010-09-08 | 中兴通讯股份有限公司 | Frame structure generating method of TDD communication system |
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| WO2009079830A1 (en) * | 2007-12-18 | 2009-07-02 | Zte Corporation | An optimization method of uppch interference measurement |
| US9119212B2 (en) | 2008-07-11 | 2015-08-25 | Qualcomm Incorporated | Inter-cell interference cancellation framework |
| US8639996B2 (en) | 2008-07-11 | 2014-01-28 | Qualcomm Incorporated | Systems and methods for uplink inter-cell interference cancellation using hybrid automatic repeat request (HARQ) retransmissions |
| CN101771432B (en) * | 2008-12-26 | 2013-06-05 | 中兴通讯股份有限公司 | Demodulation method and system used in hybrid transmission of uplink pilot signal and service signal |
| CN104394574B (en) * | 2009-01-26 | 2018-02-23 | 高通股份有限公司 | Downlink interference cancellation methods |
| US8867999B2 (en) | 2009-01-26 | 2014-10-21 | Qualcomm Incorporated | Downlink interference cancellation methods |
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| US10820327B2 (en) | 2009-01-26 | 2020-10-27 | Qualcomm Incorporated | Downlink interference cancellation methods |
| US11039449B2 (en) | 2009-01-26 | 2021-06-15 | Qualcomm Incorporated | Downlink interference cancellation methods |
| 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 |
| CN103368713A (en) * | 2012-03-26 | 2013-10-23 | 中兴通讯股份有限公司 | Device-to-device communication method and device |
| WO2015078009A1 (en) * | 2013-11-29 | 2015-06-04 | 华为技术有限公司 | Method and device for reducing self-interference signal of communication system |
| CN105594131A (en) * | 2013-11-29 | 2016-05-18 | 华为技术有限公司 | Method and device for reducing self-interference signal of communication system |
| CN105594131B (en) * | 2013-11-29 | 2018-02-06 | 华为技术有限公司 | The method and apparatus for reducing communication system self-interference signal |
| US10033428B2 (en) | 2013-11-29 | 2018-07-24 | Huawei Technologies Co., Ltd. | Method for reducing self-interference signal in communications system, and apparatus |
| CN112039570A (en) * | 2020-08-13 | 2020-12-04 | 上海道生物联技术有限公司 | Pilot frequency sending and detecting method, sending end and receiving end |
| CN112039570B (en) * | 2020-08-13 | 2023-11-03 | 上海道生物联技术有限公司 | Pilot frequency sending and detecting method, sending end and receiving end |
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| WO2006021145A1 (en) | 2006-03-02 |
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