CN101075844A - Method for expanding time-division synchronous CDMA access system ovelay range - Google Patents
Method for expanding time-division synchronous CDMA access system ovelay range Download PDFInfo
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- CN101075844A CN101075844A CNA2006100825461A CN200610082546A CN101075844A CN 101075844 A CN101075844 A CN 101075844A CN A2006100825461 A CNA2006100825461 A CN A2006100825461A CN 200610082546 A CN200610082546 A CN 200610082546A CN 101075844 A CN101075844 A CN 101075844A
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Abstract
In the invention, the method of establishing uplink synchronization by the mobile terminal in the system comprises: a) based on preact of the predetermined sending time, the mobile terminal sends the uplink pilot frequency signals; b) if the mobile terminal is not able to access, the physical layer of the mobile terminal resets the preact of the sending time, and returning to step a. The invention has the following advantages: 1)realizing the wide coverage at all kinds of scenes; 2) no need to scarifying the TS1 time slot as the extra protection time slot; 3) no need to modify the currently-used base station, and only need to make slight modification for the mobile terminal 4) no need to amend the criteria and rule.
Description
Technical field
The present invention relates to the method that a kind of expansion TD SDMA inserts (Time Division SynchronousCDMA:TD-SCDMA) system ovelay range, belong to communication technical field.
Background technology
The TD-SCDMA system is the brand-new mobile communication system of a kind of employing time division duplex (Time Division Duplex:TDD) technology, uplink and downlink of signals was distinguished by the time in this system, and has special-purpose uplink and downlink pilot time slot, send the uplink and downlink pilot signal, finish uplink and downlink pilot tone function.In the TD-SCDMA system, a wireless frame length is 10ms, is divided into two identical in structure 5ms wireless sub-frames, and the structure of wireless sub-frame as shown in Figure 1.
As can be seen from Figure 1 at each subframe (subframe, 1.28Mcps, 5ms, 6400chip), 7 conventional time slot TS0-TS6 and 3 special time slots are arranged, 3 special time slots comprise: descending pilot frequency time slot DwPTS (96chip), uplink pilot time slot UpPTS (160chip) and protection be GP (96chip) at interval, and descending pilot frequency time slot DwPTS is used for downlink synchronization and search of initial zone; Uplink pilot time slot UpPTS mainly is the initial synchronisation that realizes portable terminal and base station in random access procedure, when portable terminal is in aerial registration and at random during access state, at first launch UpPTS, when obtaining just sending Random Access Channel RACH after the replying of network; Protection interval GP is in base station side; by emission at interval to the protection that receives conversion; portable terminal is obtaining could to obtain uplink synchronous after the down-going synchronous, and protection interval GP has determined the coverage of sub-district, and the maximum covering radius of TD-SCDMA system has only 11.25 kilometers at present.
In order to make the TD-SCDMA system have bigger coverage, satisfy the synchronous requirement of TD-SCDMA system uplink simultaneously, can take two kinds of solutions at present:
(1) portable terminal carries out the regular hour in advance when sending uplink pilot signal, but in the prior art, the transmitting time lead of portable terminal is to estimate to determine by the power of DwPTS that portable terminal is received and/or Primary Common Control Physical Channel PCCPCH, for wide covering scene such as sea, desert, because the otherness of propagation model, portable terminal but can't accurately estimate the transmitting time lead of uplink pilot signal;
(2) enlarge the length of protecting time slot, that is: sacrifice the TS1 time slot and be used as extra protection time slot, but this method is bigger to the modification of base station, implement the comparison difficulty, and the capacitance loss of system is also bigger.
Summary of the invention
The present invention promptly is the method for a kind of TD-SCDMA of expansion system ovelay range of proposing at above-mentioned shortcoming of the prior art, and this method can realize the wide covering of TD-SCDMA system under various scenes.
The present invention realizes by following technical proposals:
A kind of method that enlarges time-division synchronous CDMA access system ovelay range, portable terminal is set up uplink synchronous and is comprised the steps: in the described system
(a) portable terminal carries out the transmission of uplink pilot signal according to the transmitting time lead of setting;
(b) portable terminal inserts unsuccessfully at random, and the mobile terminal physical layer resets uplink pilot signal transmitting time lead, continues execution in step (a).
Further, in the described step (a), the initial value of transmitting time lead is that portable terminal is estimated to determine according to the power of its descending pilot frequency time slot that receives and/or Primary Common Control Physical Channel.
Further, described step (b), if portable terminal is unsuccessful through inserting, the mobile terminal physical layer resets uplink pilot signal transmitting time lead and is specially:
(b21) when the trial access of portable terminal in maximum terminal physical layer number of retries was unsuccessful, the mobile terminal physical layer increased the transmitted power of uplink pilot signal, simultaneously uplink pilot signal transmitting time lead is reset;
(b22) when portable terminal is still unsuccessful through the trial access of maximum terminal physical layer number of retries, initiated by the mobile terminal protocol layer, the mobile terminal physical layer resets uplink pilot signal transmitting time lead.
Further, described terminal physical layer number of retries is configured by radio network controller.
Further, described terminal physical layer number of retries scope is 1-8.
Further, the mobile terminal physical layer of described protocol layer initiation is configured by radio network controller the number of times that uplink pilot signal transmitting time lead resets.
Further, the described protocol layer mobile terminal physical layer of initiating number of times scope that uplink pilot signal transmitting time lead is reset is 1-32.
Further, in the described step (b), it is to increase the transmitting time lead that the mobile terminal physical layer resets uplink pilot signal transmitting time lead.
Further, the recruitment of described transmitting time lead is predefined by the mobile terminal physical layer.
Further, the recruitment of described transmitting time lead is a step-length.
Compared with prior art, the present invention has following remarkable advantage:
(1) can realize the wide covering of TD-SCDMA system under various scenes;
(2) need not sacrifice the TS1 time slot as extra protection time slot, power system capacity is loss not;
(3) existing base station equipment is not changed, and only need mobile terminal device is revised a little;
(4) do not need to revise standards and norms.
Description of drawings
Fig. 1 is the wireless sub-frame structure chart of TD-SCDMA system.
Embodiment
In present 3G standard, uplink pilot signal sends number of times two definition: one is mobile terminal physical layer number of retries M, and this number of retries M configurable range is 1～8; Another is protocol layer number of retries N, and this number of retries N configurable range is 1～32.When initiating to insert, customer mobile terminal sends according to a fixed step size power increment at every turn, under M transmission back portable terminal still detects less than forward physical access channel (FPACH) situation, the report of mobile terminal physical course protocol layer, protocol layer continues to initiate to insert according to the number of retries N of configuration.Mentality of designing of the present invention promptly is not only to change power also to adjust the transmitting time predicted point when the portable terminal retry inserts.
Below in conjunction with specific embodiment the present invention is further introduced, but not as a limitation of the invention.
The distance of supposing certain portable terminal of sea and base station is 36km, but because the particularity of propagation model under the wide covering scene in sea, carry out in the random access procedure between this portable terminal and the base station, DwPTS that receives according to down-going synchronous and/or the power of PCCPCH estimate that the emission time initial lead of uplink synchronous pilot signal only is 96chip, and to set up the step of uplink synchronous as follows for this portable terminal subsequently:
Step 101, portable terminal for the first time with 96chip for the transmitting time lead sends uplink pilot signal, this moment, the coverage of TD-SCDMA system was:
Radius of society is 11.25 kilometers, and obviously in this step, portable terminal still can successful connection after through the trial connection of M power climbing;
Step 102, the report of mobile terminal physical course protocol layer inserts unsuccessful information, protocol layer is initiated, the physical layer of portable terminal increases 96chip with the transmitting time lead, also promptly with 192chip for the transmitting time lead sends uplink pilot signal, this moment, the coverage of TD-SCDMA system was:
Radius of society is 22.5 kilometers, and obviously in this step, portable terminal connects through the trial of M power climbing that the back remains unchanged not can successful connection;
Step 103, the report of mobile terminal physical course protocol layer inserts unsuccessful information, the physical layer of protocol layer initiation, portable terminal fixedly lead increases 96chip again, also promptly with 288chip for the transmitting time lead sends uplink pilot signal, this moment, the coverage of TD-SCDMA system was:
Radius of society is 33.75 kilometers, because the actual range of portable terminal and base station is 36km, thereby portable terminal will insert successfully.
In another embodiment, if insert unsuccessful in the access procedure of portable terminal in maximum terminal physical layer number of retries M, the transmitted power that not only at every turn increases uplink pilot signal increases progressively, and increase uplink pilot signal transmitting time lead, carry out the transmission of uplink pilot signal according to the transmitted power and the transmitting time lead of new settings.Realize the expansion of the coverage of TD-SCDMA thus.
Need to prove, in the foregoing description, the recruitment of transmitting time lead is predefined by the mobile terminal physical layer, if this recruitment is increased, the coverage of TD-SCDMA also will further enlarge thereupon, after portable terminal is attempted more number of times, can in the uplink pilot time slot of base station, receive uplink pilot signal like this, set up the uplink synchronous of portable terminal.
Need to prove that also the method for expansion TD-SCDMA coverage provided by the present invention not only is applicable in the wide covering scene such as sea, desert, also is applicable in other common scenarios.
Claims (10)
1. method that enlarges time-division synchronous CDMA access system ovelay range, portable terminal is set up uplink synchronous and is comprised the steps: in the described system
(a) portable terminal carries out the transmission of uplink pilot signal according to the transmitting time lead of setting;
(b) portable terminal inserts unsuccessfully at random, and the mobile terminal physical layer resets uplink pilot signal transmitting time lead, continues execution in step (a).
2. the method for claim 1 is characterized in that, in the described step (a), the initial value of transmitting time lead is that portable terminal is estimated to determine according to the power of its descending pilot frequency time slot that receives and/or Primary Common Control Physical Channel.
3. the method for claim 1 is characterized in that, described step (b), if portable terminal is unsuccessful through inserting, the mobile terminal physical layer resets uplink pilot signal transmitting time lead and is specially:
(b21) when the trial access of portable terminal in maximum terminal physical layer number of retries was unsuccessful, the mobile terminal physical layer increased the transmitted power of uplink pilot signal, simultaneously uplink pilot signal transmitting time lead is reset;
(b22) when portable terminal is still unsuccessful through the trial access of maximum terminal physical layer number of retries, initiated by the mobile terminal protocol layer, the mobile terminal physical layer resets uplink pilot signal transmitting time lead.
4. method as claimed in claim 3 is characterized in that, described terminal physical layer number of retries is configured by radio network controller.
5. method as claimed in claim 3 is characterized in that, described terminal physical layer number of retries scope is 1-8.
6. method as claimed in claim 3 is characterized in that, the mobile terminal physical layer that described protocol layer is initiated is configured by radio network controller the number of times that uplink pilot signal transmitting time lead resets.
7. method as claimed in claim 3 is characterized in that, the number of times scope that the mobile terminal physical layer that described protocol layer is initiated resets uplink pilot signal transmitting time lead is 1-32.
8. the method for claim 1 is characterized in that, in the described step (b), it is to increase the transmitting time lead that the mobile terminal physical layer resets uplink pilot signal transmitting time lead.
9. method as claimed in claim 8 is characterized in that, the recruitment of described transmitting time lead is predefined by the mobile terminal physical layer.
10. method as claimed in claim 8 is characterized in that, the recruitment of described transmitting time lead is a step-length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100825461A CN101075844B (en) | 2006-05-17 | 2006-05-17 | Method for expanding time-division synchronous CDMA access system coverage |
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| CN2006100825461A CN101075844B (en) | 2006-05-17 | 2006-05-17 | Method for expanding time-division synchronous CDMA access system coverage |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009079913A1 (en) * | 2007-11-27 | 2009-07-02 | Datang Mobile Communications Equipment Co., Ltd. | Method of processing in random access procedure, system and apparatus thereof |
| WO2009143779A1 (en) * | 2008-05-27 | 2009-12-03 | 大唐移动通信设备有限公司 | A method, system, base station and user equipment for downlink transmission |
| CN101562866B (en) * | 2008-04-18 | 2010-09-29 | 大唐移动通信设备有限公司 | Random access way as well as system and devices thereof |
| CN102067682A (en) * | 2008-06-16 | 2011-05-18 | 日本电气株式会社 | Base station control module, wireless base station, base station control device, and base station control method |
| CN101754344B (en) * | 2008-12-19 | 2011-11-09 | 中国移动通信集团设计院有限公司 | Uplink covering capacity control method of time division synchronization code division multiple access (TD-SCDMA) system and user equipment |
| WO2015188364A1 (en) * | 2014-06-13 | 2015-12-17 | Qualcomm Incorporated | Optimizing timing advance determination in uplink channel synchronization |
| CN105580456A (en) * | 2013-09-27 | 2016-05-11 | 诺基亚技术有限公司 | Methods and apparatus for wireless device synchronization |
| CN106993316A (en) * | 2017-04-10 | 2017-07-28 | 深圳市万普拉斯科技有限公司 | Call access method, device, user terminal and readable storage medium storing program for executing |
| CN114258128A (en) * | 2022-03-01 | 2022-03-29 | 四川创智联恒科技有限公司 | Access optimization method based on NR-5G small base station |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6101177A (en) * | 1992-03-30 | 2000-08-08 | Telefonaktiebolaget Lm Ericsson | Cell extension in a cellular telephone system |
| US5745484A (en) * | 1995-06-05 | 1998-04-28 | Omnipoint Corporation | Efficient communication system using time division multiplexing and timing adjustment control |
| US6633559B1 (en) * | 1999-08-11 | 2003-10-14 | Ericsson Inc. | Apparatus and methods for extended base station range using staggered uplink frame structures |
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2006
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009079913A1 (en) * | 2007-11-27 | 2009-07-02 | Datang Mobile Communications Equipment Co., Ltd. | Method of processing in random access procedure, system and apparatus thereof |
| CN101562866B (en) * | 2008-04-18 | 2010-09-29 | 大唐移动通信设备有限公司 | Random access way as well as system and devices thereof |
| WO2009143779A1 (en) * | 2008-05-27 | 2009-12-03 | 大唐移动通信设备有限公司 | A method, system, base station and user equipment for downlink transmission |
| CN102067682A (en) * | 2008-06-16 | 2011-05-18 | 日本电气株式会社 | Base station control module, wireless base station, base station control device, and base station control method |
| CN102067682B (en) * | 2008-06-16 | 2014-07-16 | 日本电气株式会社 | Base station control module, wireless base station, base station control device, and base station control method |
| US8818372B2 (en) | 2008-06-16 | 2014-08-26 | Nec Corporation | Base station control module, wireless base station, base station control device, and base station control method |
| CN101754344B (en) * | 2008-12-19 | 2011-11-09 | 中国移动通信集团设计院有限公司 | Uplink covering capacity control method of time division synchronization code division multiple access (TD-SCDMA) system and user equipment |
| CN105580456A (en) * | 2013-09-27 | 2016-05-11 | 诺基亚技术有限公司 | Methods and apparatus for wireless device synchronization |
| CN105580456B (en) * | 2013-09-27 | 2020-06-05 | 诺基亚技术有限公司 | Method and apparatus for wireless device synchronization |
| WO2015188364A1 (en) * | 2014-06-13 | 2015-12-17 | Qualcomm Incorporated | Optimizing timing advance determination in uplink channel synchronization |
| CN106993316A (en) * | 2017-04-10 | 2017-07-28 | 深圳市万普拉斯科技有限公司 | Call access method, device, user terminal and readable storage medium storing program for executing |
| CN114258128A (en) * | 2022-03-01 | 2022-03-29 | 四川创智联恒科技有限公司 | Access optimization method based on NR-5G small base station |
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| CN101075844B (en) | 2010-07-21 |
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