CN1277423C - Up synchronous method after realizing hard switch in time division duplex system - Google Patents
Up synchronous method after realizing hard switch in time division duplex system Download PDFInfo
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- CN1277423C CN1277423C CN 03120797 CN03120797A CN1277423C CN 1277423 C CN1277423 C CN 1277423C CN 03120797 CN03120797 CN 03120797 CN 03120797 A CN03120797 A CN 03120797A CN 1277423 C CN1277423 C CN 1277423C
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- user terminal
- uplink synchronous
- target cell
- uplink
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Abstract
The present invention discloses an up run synchronization method after hard switch is realized in a TDD system, which comprises when a user terminal is hard switched to a target subzone from an original subzone, the user terminal needs establishing up run synchronization with the target subzone; an up run synchronization sequence is transmitted to the target subzone by the user terminal, and the user terminal is detected whether to be synchronous with the subzone or not by the subzone according to the up run synchronization sequence; if the user terminal is synchronous with the subzone, a synchronization establishment process is completed, and if the user terminal is not synchronous with the subzone, an up run synchronization regulating quantity is loaded on up run synchronous regulating information resources and is transmitted to the user terminal; the up run synchronization sequence is regulated by the user terminal according to the regulating quantity, and is transmitted; the target subzone judges whether the user terminal achieves up run synchronization or not once again; within a certain number of times, the process is circulated until up run synchronization is established. FPACH resources can not be occupied by the method, and the efficiency of the TDD system is enhanced.
Description
Technical field
The present invention relates to the hard-switching technology in time division duplex (TDD) system, particularly a kind of uplink synchronisation method of in the TDD system, realizing behind the direct-cut operation.
Background technology
Development along with communication network, people no longer have been satisfied with by computer access communications network, but the connection processing miscellaneous service can both be carried out with communication network in any place of hope realization, as reception and send Email, carry out business such as network browsing and file download, therefore, third generation communication network (3G) has grown up.
Time division multiplexing-S-CDMA (TD-SCDMA) is one of standard of 3G network, in the mobile communication system of time division duplex (TDD) pattern, receive and send professional different time-gap at same frequency channels, receive respectively and transfer channel with disengaging time, the characteristics of TDD system are: do not need paired frequency, can use various frequency resources, be applicable to asymmetric up-downgoing transfer of data frequency; The availability of frequency spectrum is higher, and the correlation of up-downgoing resource is big; When carrying out the sub-district switching, adopt direct-cut operation.
Standard changes when the sub-district at user terminal place, as the standard of this sub-district by Frequency Division Duplexing (FDD) (FDD) when becoming TDD or user terminal when roaming into other sub-districts by current area, must carry out the switching of user terminal, when adjacent cell belongs to alien frequencies or the sub-district of roaming when covering by the TD-SCDMA system, can only adopt direct-cut operation, the process of direct-cut operation is to interrupt earlier and the communicating by letter of original sub-district, and taps into from Target cell then.
As shown in Figure 1, Fig. 1 is the signaling process figure of direct-cut operation between same service wireless communication controller (SRNC) different districts, this system is that target NODE B forms by the NODEB at the Target cell place that the network node (NODE B) at user terminal, user terminal current area place will switch for service NODE B, user terminal, and its detailed process is:
Step 100, the SRNC at the current place of user terminal sends radio bearer to target NODE B and sets up request (RADIO LINK SETUP REQUEST) message, and this message requires to set up a wireless links;
Step 101,102, target NODE B returns radio bearer to this SRNC and sets up response (RADIOLINK SETUP RESPONSE) message, this message shows that Radio Link sets up successfully, and this SRNC adopts controlling links passage (ALCAP) agreement to set up SRNC and target NODE B transmission bearer;
Step 103, this SRNC sends transmission channel to user terminal and reshuffles (PHYSICALCHANNEL RECONFIGURATION) message, contains the information of target NODE B in the message;
Step 105, user terminal successful switch send physical channel by special-purpose control channel (DCCH) to SRNC and reshuffle and finish (PHYSICAL CHANNELRECONFIGURATION COMPLETE) message behind the target NODE B;
Step 107, after the Radio Link deletion of former NODEB and user terminal, former NODE B sends the Radio Link deletion to SRNC and replys (RADIO LINK DELETION RESPONSE) message;
Step 108, SRNC adopts the ALCAP agreement to discharge the transmission bearer of SRNC and former NODE B.
Except the described direct-cut operation situation of Fig. 1, direct-cut operation can also be realized in following several situations:
1) in same sub-district, the direct-cut operation between FDD and the TDD mode;
2) between the sub-district of different SRNC;
3) between the sub-district in the same NODE B.
In the TDD system, the user terminal success switch to Target cell after, need to set up uplink synchronous with Target cell again, the method flow diagram of setting up uplink synchronous as shown in Figure 2, its detailed process is:
Step 202,203,204,205, the base station judges according to the uplink synchronous code sequence whether user terminal is synchronous with Target cell, if synchronously, then set up uplink synchronous; Otherwise, this base station sends the uplink synchronous adjustment information by physical access channel (FPACH) to the user, user terminal adjusts the time that sends the uplink synchronous code sequence next time according to this uplink synchronous adjustment information and according to this time transmission uplink synchronous code sequence, foundation synchronously.
From said method as can be seen, this method is according to the uplink synchronous of setting up after the synchronous method of initial uplink is set up direct-cut operation, in setting up the process of uplink synchronous, the base station of Target cell need send the uplink synchronous adjustment amount to the user, because it is bigger to set up the scope of the synchronous up adjustment amount that needs of initial uplink, this adjustment amount need transmit by FPACH in the prior art, and the scope of setting up the up adjustment amount that uplink synchronous needs behind the direct-cut operation is less, if also according to setting up the synchronous method of initial uplink, the adjustment amount of the uplink synchronous behind the direct-cut operation transmits by FPACH, the adjustment amount of the uplink synchronous behind the direct-cut operation will take whole FPACH channel resource so, reduce the efficient of TDD system.In fact, because the base station synchronization precision of TDD system neighbor cell is very high, so the adjustment amount of uplink synchronous is smaller.Do not need to use an independent FPACH channel.
Summary of the invention
By Given this, the invention provides a kind of uplink synchronisation method of in the TDD system, realizing behind the direct-cut operation, in order to improve the efficient of TDD system.
Technical scheme of the present invention in order to achieve the above object is achieved in that
A kind of uplink synchronisation method of in tdd systems, realizing behind the direct-cut operation, this method comprises:
A, a time slot is set in the physical layer subframe is used to transmit the uplink synchronous code sequence, be set a time period as uplink synchronous adjustment information resource;
B, user terminal are to the described uplink synchronous code sequence of Target cell forwarding step A, Target cell is according to the uplink synchronous code sequence in this subframe, judge whether user terminal reaches uplink synchronous at Target cell, if, set up the synchronous of user terminal and Target cell, finish direct-cut operation, otherwise, change step C over to;
C, Target cell send to user terminal with the uplink synchronous adjustment amount by the uplink synchronous adjustment information resource in the described subframe of steps A, this uplink synchronous adjustment information resource bearing the uplink synchronous adjustment amount, user terminal is adjusted the transmitting time of uplink synchronous code sequence and is sent uplink synchronous code sequence to Target cell according to this time according to this uplink synchronous adjustment amount, Target cell judges whether user terminal reaches uplink synchronous, if synchronously, set up the synchronous of user terminal and Target cell, otherwise, change step D over to;
D, Target cell judge whether the number of times of adjusting synchronously surpasses the threshold number that sets in advance, if do not surpass, changes step C over to, if surpass, finishes direct-cut operation.
The described uplink synchronous code sequence of steps A sends to user terminal by former sub-district.
The described uplink synchronous adjustment information of steps A resource sends to user terminal by former sub-district.
The uplink synchronous adjustment amount of described each transmission is identical.
The number of times of described synchronous adjustment be tdd systems setting in advance and send to user terminal by former sub-district.
A described time period length is a symbol symbol.
Owing in the TDD system direct-cut operation accurate down-going synchronous is arranged, user terminal is when the uplink synchronous of foundation and Target cell, the scope of uplink synchronous adjustment amount is smaller, this uplink synchronous adjustment amount does not among a small circle need to waste the so special physical channel of FPACH and transmits, only need the one section very little resource in the subframe to transmit, therefore, user terminal obtains the uplink synchronous code sequence of Target cell and the resource of synchronous adjustment information from former sub-district before switching, Target cell is carried on the uplink synchronous adjustment amount on the synchronous adjustment information resource and sends to user terminal in switching, user terminal is adjusted the transmitting time of uplink synchronous sequence according to this uplink synchronous adjustment amount, the uplink synchronous of final foundation and Target cell, the present invention does not take the FPACH resource, has improved the efficient of TDD system.
Description of drawings
Fig. 1 is the signaling process figure of direct-cut operation between same wireless communication controller (SRNC) different districts.
Fig. 2 is a method flow diagram of setting up uplink synchronous.
Fig. 3 is physical layer subframe structure figure of the present invention.
Fig. 4 realizes the flow chart of user terminal and Target cell uplink synchronisation method for the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Owing in the TDD system, when user terminal switches, adopt direct-cut operation between different sub-districts, in direct-cut operation, had synchronously accurate between the base station of different districts.User terminal is in former sub-district, obtained the necessary information of Target cell, adjust resource as up synchronization code sequence and uplink synchronous, when user terminal and Target cell are set up uplink synchronous, Target cell does not need to transmit the uplink synchronous adjustment information by the whole channel of FPACH to user terminal, only need to transmit the uplink synchronous adjustment amount to user terminal by a period of time in the physical layer subframe, therefore, at first in existing physical layer subframe, be provided for carrying uplink synchronous and adjust resource (US), Target cell sends the uplink synchronous adjustment amount to user terminal by this US, when user terminal and Target cell are set up uplink synchronous, use this uplink synchronous adjustment amount to adjust the uplink synchronous code sequence.
Uplink synchronous adjustment amount and uplink synchronous code sequence are by the transmission of physical layer subframe, wherein, 128 subframes are as a control cycle, uplink synchronous code sequence and uplink synchronous adjustment amount can any one subframe in 128 subframes transmit, as shown in Figure 3, Fig. 3 is physical layer subframe structure figure of the present invention, under fixing frame length, a time slot is used for transmission user uplink synchronous code sequence (SYNC-UL), a period of time is used to carry uplink synchronous and adjusts resource (US), this time period can be a symbol (symbol), upward arrow among the figure is represented up direction, promptly transmit the uplink synchronous code sequence by user terminal to Target cell, following arrow is represented down direction, promptly transmits the US that has carried the uplink synchronous adjustment amount to user terminal by Target cell.
This frame has been arranged, just can realize the uplink synchronous of user terminal and Target cell, as shown in Figure 4, Fig. 4 realizes the flow chart of user terminal and Target cell uplink synchronisation method for the present invention, and its concrete steps are:
Step 402,403, user terminal cut off with the getting in touch of former sub-district after, begin to get in touch with Target cell, send the uplink synchronous code sequence to Target cell;
Whether uplink synchronous of user terminal and Target cell is judged according to the uplink synchronous code sequence in the base station of step 404,405, Target cell, if change step 409 over to, otherwise Target cell sends the uplink synchronous adjustment amount to user terminal;
Step 406, user terminal resends the uplink synchronous code sequence for the base station of Target cell according to the uplink synchronous adjustment amount, promptly the transmitting time of uplink synchronous code sequence is adjusted, the uplink synchronous code sequence is sent again according to adjusted transmitting time according to the uplink synchronous adjustment amount;
Step 408,410, judge whether the number of times of adjusting synchronously surpasses the initial times N of setting, this N time number be by the TDD default and send user terminal to by former sub-district, if, the uplink synchronous of user terminal and Target cell is set up failure, whole direct-cut operation failure, otherwise, change step 405 once more over to;
The method that in the TDD system, realizes uplink synchronous provided by the invention, when user terminal carries out direct-cut operation, the resource that uplink synchronous is adjusted is set in the physical layer subframe, the uplink synchronous adjustment amount of Target cell is carried on the uplink synchronous adjustment resource and sends, user terminal is finished the uplink synchronous of switching back and Target cell by this uplink synchronous adjustment amount, thereby do not take the FPACH resource of TDD system, improved the operating efficiency of TDD system.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1, a kind of uplink synchronisation method of realizing in tdd systems behind the direct-cut operation is characterized in that this method comprises:
A, a time slot is set in the physical layer subframe is used to transmit the uplink synchronous code sequence, be set a time period as uplink synchronous adjustment information resource;
B, user terminal are to the described uplink synchronous code sequence of Target cell forwarding step A, Target cell is according to the uplink synchronous code sequence in this subframe, judge whether user terminal reaches uplink synchronous at this Target cell, if, set up the synchronous of user terminal and Target cell, finish direct-cut operation, otherwise, change step C over to;
C, Target cell send to user terminal with the uplink synchronous adjustment amount by the uplink synchronous adjustment information resource in the described subframe of steps A, this uplink synchronous adjustment information resource bearing the uplink synchronous adjustment amount, user terminal is adjusted the transmitting time of uplink synchronous code sequence and is sent uplink synchronous code sequence to Target cell according to this time according to this uplink synchronous adjustment amount, Target cell judges whether user terminal reaches uplink synchronous, if synchronously, set up the synchronous of user terminal and Target cell, otherwise, change step D over to;
D, Target cell judge whether the number of times of adjusting synchronously surpasses the pre-set threshold number of times, if do not surpass, changes step C over to, if surpass, finishes direct-cut operation.
2, the method for claim 1 is characterized in that, the described uplink synchronous code sequence of steps A sends to user terminal by former sub-district.
3, the method for claim 1 is characterized in that, the described uplink synchronous adjustment information of steps A resource sends to user terminal by former sub-district.
4, the method for claim 1 is characterized in that, the uplink synchronous adjustment amount of described each transmission is identical.
5, the method for claim 1 is characterized in that, the number of times of described synchronous adjustment be tdd systems setting in advance and send to user terminal by former sub-district.
6, the method for claim 1 is characterized in that, a described time period length is a symbol symbol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03120797 CN1277423C (en) | 2003-03-20 | 2003-03-20 | Up synchronous method after realizing hard switch in time division duplex system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03120797 CN1277423C (en) | 2003-03-20 | 2003-03-20 | Up synchronous method after realizing hard switch in time division duplex system |
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| CN1533195A CN1533195A (en) | 2004-09-29 |
| CN1277423C true CN1277423C (en) | 2006-09-27 |
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| CN 03120797 Expired - Fee Related CN1277423C (en) | 2003-03-20 | 2003-03-20 | Up synchronous method after realizing hard switch in time division duplex system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007056891A1 (en) * | 2005-11-16 | 2007-05-24 | Zte Corporation | A up-link synchronization method in mobile communication system |
| CN101001198B (en) * | 2006-01-10 | 2010-08-18 | 中兴通讯股份有限公司 | Processing method for service data pack in hard switch process |
| CN101064561B (en) * | 2006-04-29 | 2011-08-10 | 华为技术有限公司 | Method for realizing uplink synchronization during inter-cell switch process |
| CN101102578B (en) * | 2006-07-04 | 2010-09-29 | 联想(北京)有限公司 | A wireless signal measurement and control method for TD-SCDMA multi-mode terminal |
| CN101351035B (en) * | 2007-07-19 | 2011-11-30 | 中兴通讯股份有限公司 | Up synchronization method and apparatus for TD-SCDMA system |
| CN101730220B (en) * | 2009-12-10 | 2012-02-01 | 北京天碁科技有限公司 | Method, system and terminal for scheduling neighbor cell task |
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Owner name: BEIJING ZHIXUN HUOBAN TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: HUAWEI TECHNOLOGY CO., LTD. Effective date: 20150605 |
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Effective date of registration: 20150605 Address after: 100193 Beijing City, northeast of Haidian District, South Road, No. 29, building 3, room 4, room 4516 Patentee after: Beijing wisdom partner Technology Co., Ltd. Address before: 518057 Guangdong city of Shenzhen province science and Technology Park of HUAWEI Road Service Building Patentee before: Huawei Technologies Co., Ltd. |
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