CN1855767A - Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes - Google Patents
Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes Download PDFInfo
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- CN1855767A CN1855767A CNA2005100647296A CN200510064729A CN1855767A CN 1855767 A CN1855767 A CN 1855767A CN A2005100647296 A CNA2005100647296 A CN A2005100647296A CN 200510064729 A CN200510064729 A CN 200510064729A CN 1855767 A CN1855767 A CN 1855767A
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Abstract
The one frame in system thereof comprises: TS0-TS6 time slots, down link pilot time slot (DwPTS), guard period (GP) and up link pilot time slot (UpPTS). The method thereof comprises following steps: configuring the UpPTS and TSI time slot as the test time slot of up link random access; the base station tests the up link random access signal sent by the communication terminal in the test time slot of up link random access. The invention clears the interference to down link signal of other communication terminal from up link random access signal, and doesn't configure TS1 time slot as an up link service time slot such that the interference to the down link signal of other communication terminal from TS1 signal is also removed.
Description
Technical field
The present invention relates to TD SDMA (TD-SCDMA) technology, be meant a kind of method of in the TD-SCDMA communication system, setting up the long radius sub-district especially.
Background technology
The TD-SCDMA communication system is a kind of tdma communication system self-adaption CDMA characteristics, advanced of working, have under synchronous mode.A frame in the TD-SCDMA communication system be 10 milliseconds (ms) at interval, each frame is divided into the subframe of two 5ms again, shown in Figure 1A, the spreading rate in the TD-SCDMA communication system is per second 1.28 million chips (Mchip), and a subframe is held 6400 chips altogether.Each subframe is divided into 7 TS0 time slots to the TS6 time slot; also comprise protection interval (GP) time slot of descending pilot frequency (DwPTS) time slot of 96 chips, 96 chips and three special time slots of ascending pilot frequency (UpPTS) time slot of 160 chips in addition, as Synchronous Processing.In the time slot of each subframe, configuration TS0 time slot always is used for down link, and the TS1 time slot always is used for up link, but TS2 time slot to TS6 time slot is used for up link or is used for the down link flexible configuration.
Figure 1B shows uplink pilot time slot structural representation in the existing TD-SCDMA communication system, and shown in Figure 1B, uplink pilot time slot is made up of uplink random access (SYNC UL) signal slot of 128 chips and the protection interval (GP) of 32 chips.
In the TD-SCDMA communication system; usually the base station will be protected interval time slot and uplink pilot time slot to insert as uplink random and detect time slot; the TS1 time slot is as the uplink service time slot; communication terminal can send uplink random access signal by the set time lead; or the Timing Advance that goes out according to information calculations such as downlink loss, radius of societies sends uplink random and inserts signal, like this communication terminal position that sends uplink random access signal with regard to corresponding drop on the corresponding time slot of Timing Advance in a certain position on.In this case, a lot of problems can appear in the TD-SCDMA communication system, below some problems that can occur in the TD-SCDMA communication system are described.
When communication terminal sends uplink random access signal with the set time lead, if communication terminal sends the position of uplink random access signal and drops in the time slot of protection interval, then at radius of society during greater than 11.25 kms (Km), uplink random that the base station receives inserts in the protection at interval of 32 chips that signal can partly drop on the uplink pilot time slot afterbody, even might partly drop on the TS1 time slot, referring to Fig. 2, this will be unfavorable for the detection of base station to uplink random access signal very much, also may cause interference to the uplink service signal simultaneously; When radius of society during greater than 11.25 kms, for avoiding occurring these problems, communication terminal will send the position of uplink random access signal to be continued in advance, like this, communication terminal sends the position of uplink random access signal will drop on descending pilot frequency time slot or even TS0 time slot, therefore, the uplink random of communication terminal transmission inserts signal and will cause interference near other communication terminals that receive down-bound pilot frequency signal or TS0 signal this communication terminal.
When the Timing Advance that goes out according to information calculations such as downlink loss, radius of societies when communication terminal sends uplink random and inserts signal, if radius of society is during greater than 11.25 kms, communication terminal sends the position of uplink random access signal can drop on descending pilot frequency time slot or even TS0 time slot, like this, the uplink random of communication terminal transmission inserts signal and will cause interference near other communication terminals that receive down-bound pilot frequency signal or TS0 signal this communication terminal.In addition, the existence of problems such as the multipath that causes owing to reasons such as environment, building block, signal fadeout, utilize downlink loss to estimate that the Timing Advance that sends uplink random access signal is inaccurate, and under the situation of environment more complicated, even can exist very mistake.In this case, communication terminal sends the position of uplink random access signal and drops on descending pilot frequency time slot or even TS0 time slot possibly, like this, the uplink random that communication terminal sends inserts signal also will cause interference near other communication terminals that receive down-bound pilot frequency signal or TS0 signal this communication terminal, and this problem is stood in great numbers at high building, the sub-district of dense traffic is particularly serious.If radius of society is greater than 30 kms, then the position of communication terminal transmission uplink service signal also needs in advance, so just may drop on descending pilot frequency time slot or even TS0 time slot, like this, the uplink service signal of communication terminal transmission also will cause interference near other communication terminals that receive down-bound pilot frequency signal or TS0 signal this communication terminal.
The Timing Advance no matter communication terminal still calculates according to the set time lead sends uplink random and inserts signal, when communication terminal will send position that uplink random inserts signal and drop on descending pilot frequency time slot or TS0 time slot, unless the radio frequency of communication terminal is a duplex mode, otherwise, communication terminal can't receive down-bound pilot frequency signal or TS0 signal simultaneously, but the radio frequency of communication terminal is made duplex mode, can increase the implementation complexity of communication terminal hardware again, and improve the cost of communication terminal.
For the above problem, also there is not at present effective and feasible solution, just consider following some factor, allow uplink random to insert the interference of signal existence to downstream signal: near the likelihood ratio of a communication terminal of the first other communication terminals is lower, and be especially true at the long radius sub-district; It two is that down-bound pilot frequency signal does not need every frame all to receive, and in the Cell searching stage, can not receive down-bound pilot frequency signal once in a while several times, and is little to the performance impact of Cell searching; It three is that communication terminal only just can send uplink random and inserts signal when inserting at random and switching, and communication terminal sends uplink random, and to insert the likelihood ratio of signal lower, therefore, just lower to the influence of other signals.But even so, maximum radius of society also can only reach 22.5 kms, set up the sub-district of radius if desired greater than 22.5 kms, just can only allow uplink random to insert the existence of signal to the interference of down-bound pilot frequency signal and TS0 signal, and the TS1 signal is to the existence of the interference of down-bound pilot frequency signal and TS0 signal, therefore, general solution is to avoid setting up the long radius sub-district at present, to avoid the gradually serious of various interference problems.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method of in the TD-SCDMA communication system, setting up the long radius sub-district, in the TD-SCDMA communication system, set up the long radius sub-district, and eliminate uplink random and insert the interference of signal downstream signal.
In order to achieve the above object; the invention provides a kind of method of in the TD-SCDMA communication system, setting up the long radius sub-district; a frame in the time division synchronous code division multiple access communication system comprises the TS0 time slot to TS6 time slot, descending pilot frequency time slot, protection interval time slot and uplink pilot time slot, and the method includes the steps of:
A, be that uplink random inserts and detects time slot with uplink pilot time slot and TS1 time slot configuration;
B, base station are inserted at uplink random and are detected the uplink random access signal that time slot detects the communication terminal transmission.
Dispose described uplink random access detection time slot and further comprise protection time slot at interval.
Configuration described in the steps A is finished in the base station.
This method further comprises: with TS2 time slot arbitrary time slot configuration to the TS6 time slot is the uplink service time slot, and the uplink service signal that communication terminal sends is detected at described uplink service time slot in the base station.
This method further comprises: communication terminal is inserting transmission uplink random access signal on the position of detecting in the time slot with the corresponding described uplink random of Timing Advance.
Described Timing Advance is the set time lead of setting.
Described Timing Advance is that communication terminal calculates according to link load and radius of society.
According to the proposed method; include the TS1 time slot in uplink random and insert the time slot scope that detects; being about to uplink pilot time slot and TS1 time slot configuration is that uplink random inserts the detection time slot; further; protection time slot at interval also can be included the time slot scope that uplink random inserts detection in; be about to protection time slot at interval; uplink pilot time slot and TS1 time slot configuration are that uplink random inserts the detection time slot; the base station is inserted at this uplink random and is detected the uplink random access signal that time slot detects the communication terminal transmission; like this; eliminated uplink random and inserted the interference of signal, also no longer influenced this communication terminal and receive downstream signal the downstream signal of other communication terminals.Owing to no longer be the uplink service time slot, also correspondingly eliminated of the interference of TS1 signal to the downstream signal of other communication terminals with the TS1 time slot configuration.According to the proposed method, allow to set up the sub-district that radius can reach 112.5 kms.
In addition; according to the proposed method; uplink pilot time slot or protection interval time slot are dropped in the position that communication terminal is sent uplink random access signal; be equally applicable to the sub-district of radius, and can solve owing to link load under the complex environment is estimated the inaccurate problem that causes less than 11.25 kms.
Description of drawings
Figure 1A shows existing TD-SCDMA communication system neutron frame slot structural representation;
Figure 1B shows uplink pilot time slot structural representation in the existing TD-SCDMA communication system;
Fig. 2 A shows the TD-SCDMA communication system neutron frame slot structural representation among the present invention;
Fig. 2 B shows uplink pilot time slot structural representation in the TD-SCDMA communication system among 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.
Among the present invention, be the uplink service time slot no longer with the TS1 time slot configuration, insert the time slot scope that detects but include the TS1 time slot in uplink random, being about to uplink pilot time slot and TS1 time slot configuration is that uplink random inserts the detection time slot, the base station is inserted at this uplink random and is detected the uplink random access signal that time slot detects the communication terminal transmission, shown in Fig. 2 A; Further; protection time slot at interval also can be included the time slot scope that uplink random inserts detection in; being about to protection interval time slot, uplink pilot time slot and TS1 time slot configuration is that uplink random inserts the detection time slot, and the base station is inserted at this uplink random and detected the uplink random access signal that time slot detection communication terminal sends.
Fig. 2 B shows uplink pilot time slot structural representation in the TD-SCDMA communication system among the present invention; shown in Fig. 2 B; uplink random inserts the detection time slot and is made up of the uplink pilot time slot of 160 chips and the TS1 time slot of 864 chips; wherein, uplink pilot time slot is made of at interval the uplink random access signal slot of 128 chips and the protection of 32 chips.Further, uplink random inserts and detects the protection interval time slot that time slot also can further comprise 96 chips.
When communication terminal sends uplink random access signal; can be according to Timing Advance; drop on the corresponding uplink random of set time lead and insert on the position of detecting in the time slot sending position that uplink random inserts signal; the position that will send uplink random access signal as communication terminal is dropped on certain position of uplink pilot time slot or protection interval time slot; like this; communication terminal sends the position of uplink random access signal can not drop on descending pilot frequency time slot again; or even the TS0 time slot, also just eliminated receiving the interference of other communication terminals of down-bound pilot frequency signal or TS0 signal near this communication terminal.Above-described Timing Advance can be predefined set time lead, also can be the Timing Advance that communication terminal goes out according to information calculations such as link load, radius of societies.In addition, drop on uplink pilot time slot or protection interval time slot, then no longer influence this communication terminal and receive downstream signal because communication terminal will send the position of uplink random access signal.
Insert the time slot scope that detects owing to include the TS1 time slot in uplink random among the present invention, like this, the TS1 time slot no longer has been the uplink service time slot, therefore, has also just eliminated the TS1 signal to receiving the interference of other communication terminals of down-bound pilot frequency signal or TS0 signal near the communication terminal.
Because but the TS2 time slot to TS6 time slot flexible configuration, therefore, can be the uplink service time slot to the arbitrary time slot configuration in the TS6 time slot with the TS2 time slot, the uplink service signal that communication terminal sends is detected at the uplink service time slot that configures in the base station; But remaining time slots is flexible configuration still.
According to the proposed method; in the time will protecting interval time slot, uplink pilot time slot and TS1 time slot configuration to be uplink random access detection time slot; because the length of uplink pilot time slot is 160 chips; the length of TS1 time slot is 864 chips; consider protection to the TS2 time slot; can reserve the protection interval of 32 chips at the afterbody of TS1 time slot; like this; if communication terminal will send the position of uplink random access signal and drop on the protection head of time slot at interval, then allow to set up the sub-district that radius can reach 112.5 kms.
In addition; according to the proposed method; uplink pilot time slot or protection interval time slot are dropped in the position that communication terminal is sent uplink random access signal; be equally applicable to the sub-district of radius, and can solve owing to link load under the complex environment is estimated the inaccurate problem that causes less than 11.25 kms.
Compare with existing method, though the present invention is the uplink service time slot with the TS1 time slot configuration no longer, reduced cell capacity, but the sub-district that radius is bigger all is based upon scarcely populated place usually, be positioned at the communication terminal negligible amounts of sub-district, traffic carrying capacity is also relatively low, and therefore, this sacrifice is rational.
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 (7)
1, a kind of method of in time division synchronous code division multiple access communication system, setting up the long radius sub-district; a frame in the time division synchronous code division multiple access communication system comprises that the TS0 time slot is to TS6 time slot, descending pilot frequency time slot, protection interval time slot and uplink pilot time slot; it is characterized in that the method includes the steps of:
A, be that uplink random inserts and detects time slot with uplink pilot time slot and TS1 time slot configuration;
B, base station are inserted at uplink random and are detected the uplink random access signal that time slot detects the communication terminal transmission.
2, method according to claim 1 is characterized in that, disposes described uplink random access detection time slot and further comprises protection time slot at interval.
3, method according to claim 1 and 2 is characterized in that, configuration described in the steps A is finished in the base station.
4, method according to claim 1 and 2, it is characterized in that, this method further comprises: with TS2 time slot arbitrary time slot configuration to the TS6 time slot is the uplink service time slot, and the uplink service signal that communication terminal sends is detected at described uplink service time slot in the base station.
5, method according to claim 1 and 2 is characterized in that, this method further comprises: communication terminal is inserting transmission uplink random access signal on the position of detecting in the time slot with the corresponding described uplink random of Timing Advance.
6, method according to claim 5 is characterized in that, described Timing Advance is the set time lead of setting.
7, method according to claim 5 is characterized in that, described Timing Advance is that communication terminal calculates according to link load and radius of society.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100647296A CN1855767B (en) | 2005-04-18 | 2005-04-18 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
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| CN2005100647296A CN1855767B (en) | 2005-04-18 | 2005-04-18 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
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| WO2008014672A1 (en) * | 2006-07-27 | 2008-02-07 | Zte Corporation | Transmitting method for asynchronism random access pilot signal |
| WO2009092329A1 (en) * | 2008-01-17 | 2009-07-30 | Zte Corporation | Transmitting method of signal on random access channel in wireless communication system |
| WO2010102457A1 (en) * | 2009-03-13 | 2010-09-16 | 华为技术有限公司 | Method and apparatus for transmitting short random access signalings, method and apparatus for carrying short random access channels |
| WO2010111838A1 (en) * | 2009-04-03 | 2010-10-07 | 华为技术有限公司 | Method and apparatus of transmitting preamble signal for random access |
| CN101102525B (en) * | 2007-08-06 | 2012-04-18 | 中兴通讯股份有限公司 | An uplink and downlink conversion time generation method of LTE class II frame structure |
| CN102958171A (en) * | 2011-08-18 | 2013-03-06 | 开曼晨星半导体公司 | Reducing interference in wireless time division duplex systems by monitoring and limiting timing advance |
| 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 |
| WO2015135295A1 (en) * | 2014-03-12 | 2015-09-17 | 中兴通讯股份有限公司 | Method, device and system for detecting random access signal in interference environment |
| CN106851854A (en) * | 2017-03-22 | 2017-06-13 | 北京方天长久科技股份有限公司 | A kind of serial communication frame structure and multinode accidental access method |
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| JP4005365B2 (en) * | 2000-03-23 | 2007-11-07 | シーメンス モービル コミュニケイションズ ソシエタ ペル アチオニ | Access channel scheduling in wireless communication systems |
| CN1274098C (en) * | 2002-06-06 | 2006-09-06 | 华为技术有限公司 | Transmission method for high speed grouping busihess data based on TDD |
| CN100558019C (en) * | 2002-10-23 | 2009-11-04 | 华为技术有限公司 | A kind of initial uplink method for synchronous of tdd systems |
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| WO2008014672A1 (en) * | 2006-07-27 | 2008-02-07 | Zte Corporation | Transmitting method for asynchronism random access pilot signal |
| CN101114870B (en) * | 2006-07-27 | 2010-12-29 | 中兴通讯股份有限公司 | Method for transmitting non-synchronous random access guiding signal |
| CN101102525B (en) * | 2007-08-06 | 2012-04-18 | 中兴通讯股份有限公司 | An uplink and downlink conversion time generation method of LTE class II frame structure |
| US8416718B2 (en) | 2008-01-17 | 2013-04-09 | Zte Corporation | Transmitting methods of a signal on a random access channel in a wireless communication system |
| WO2009092329A1 (en) * | 2008-01-17 | 2009-07-30 | Zte Corporation | Transmitting method of signal on random access channel in wireless communication system |
| US9197343B2 (en) | 2008-01-17 | 2015-11-24 | Zte Corporation | Transmitting methods of a signal on a random access channel in a wireless communication system |
| 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 |
| WO2010102457A1 (en) * | 2009-03-13 | 2010-09-16 | 华为技术有限公司 | Method and apparatus for transmitting short random access signalings, method and apparatus for carrying short random access channels |
| WO2010111838A1 (en) * | 2009-04-03 | 2010-10-07 | 华为技术有限公司 | Method and apparatus of transmitting preamble signal for random access |
| CN101940053B (en) * | 2009-04-03 | 2013-06-26 | 华为技术有限公司 | Method and apparatus of transmitting preamble signal for random access |
| CN102958171A (en) * | 2011-08-18 | 2013-03-06 | 开曼晨星半导体公司 | Reducing interference in wireless time division duplex systems by monitoring and limiting timing advance |
| CN102958171B (en) * | 2011-08-18 | 2015-12-16 | 开曼晨星半导体公司 | By monitoring and binding hours lead to eliminate the method for the interference in time-division duplex radio network |
| US9363779B2 (en) | 2011-08-18 | 2016-06-07 | Mstar Semiconductor, Inc. | Reducing interference in wireless time division duplex systems by monitoring and limiting timing advance |
| WO2015135295A1 (en) * | 2014-03-12 | 2015-09-17 | 中兴通讯股份有限公司 | Method, device and system for detecting random access signal in interference environment |
| CN106851854A (en) * | 2017-03-22 | 2017-06-13 | 北京方天长久科技股份有限公司 | A kind of serial communication frame structure and multinode accidental access method |
| CN106851854B (en) * | 2017-03-22 | 2020-03-17 | 北京方天长久科技股份有限公司 | Serial communication frame structure and multi-node random access method |
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