CN1735271A - Hard handoff method and device and TD-SCDMA system using same method and device - Google Patents
Hard handoff method and device and TD-SCDMA system using same method and device Download PDFInfo
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- CN1735271A CN1735271A CN 200510027462 CN200510027462A CN1735271A CN 1735271 A CN1735271 A CN 1735271A CN 200510027462 CN200510027462 CN 200510027462 CN 200510027462 A CN200510027462 A CN 200510027462A CN 1735271 A CN1735271 A CN 1735271A
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Abstract
This invention discloses a hard-switch method in TD-SCDMA that uses activation time that physical channel re-configures command to take down synchronization for target subzone and shrink interruption time. it also discloses a opposite device, which comprises a control device, a pre-synchronization device and a switch operation device. Besides, it discloses a TD-SCDMA system that is characterized in it comprises at least a said hard-switch device and the said method.
Description
Technical field
The present invention relates to the method for hard switching of a kind of TD-SCDMA of being used for system, be used for the equipment of this method, and the TD-SCDMA system of this method of a kind of application and this device.
Background technology
Nineteen forty-six, the Bell Laboratory of the U.S. has just proposed the service area of mobile phone is divided into several sub-districts, and a base station is established in each sub-district, constitutes honeycomb (Cellular) the mobile communication new ideas of cellular communication system.1978, this system succeedd in the Chicago,U.S test, and formally puts it into commercial operation in nineteen eighty-three.The employing of cellular system makes identical frequency to reuse, thereby has increased the capacity of mobile communication system greatly, has adapted to the desirability that mobile communication subscriber increases suddenly.The development of cell mobile communication systems experienced one from the simulation net to digital network, from frequency division multiple access (FDMA) to time-division multiple access (TDMA) with the process of code division multiple access (CDMA).
Switching is as important basic function in the cell mobile communication systems, in mobile communication system, bringing into play irreplaceable effect, it is meant when user terminal moves or with the base station call of this user terminal communication when busy the process that this user terminal is communicated by letter with a new communication base station.Generally speaking, switching is divided into direct-cut operation and soft handover, and first interruption and former base station gets in touch in soft handover, but earlier with after new base station is connected, getting in touch of interruption and former base station again, and in direct-cut operation, interrupt earlier and the getting in touch of former base station, be connected with new base station again.If in the process of user's communication, direct-cut operation takes place, the time of interrupting will appear in conversation, even can go offline.And in the TD-SCDMA system, switching is divided into direct-cut operation and baton handover.
Under the CELL_DCH pattern, for the sub-district that has comprised in measuring control, because the difference of terminal implementation, the timing value of Target cell can not guarantee very high refresh rate.If the measured value before using in carrying out direct-cut operation this moment timing offset can occur unavoidably.Before switching, Target cell is done synchronizing process one time during the safest method.And just can increase interrupting the time of whole direct-cut operation like this.Thereby in the existing TD-SCDMA system, the time of interrupting in direct-cut operation mainly is made of three parts:
1) the down-going synchronous time;
2) read Target cell SFN (System Frame Number, the System Frame Number) time;
3) the uplink synchronous time.
The flow chart of existing direct-cut operation as shown in Figure 1.In the physical channel reconfigure command, have an activationary time, it determines a moment, arriving this constantly the time, begins to carry out direct-cut operation, and if do not arrive activationary time, then continue to wait for, keep and the communicating by letter of Serving cell.
Summary of the invention
The method that the purpose of this invention is to provide the direct-cut operation among a kind of TD-SCDMA is so that can shorten interrupting the time in the direct-cut operation.
Activationary time in the physical channel reconfigure command and current time have certain interval, and the present invention utilizes this time interval to carry out part steps in the direct-cut operation in advance just.The technical solution adopted in the present invention is:
A kind of method for hard switching comprises following two groups of steps:
First group:
Step 1, judgement are with frequency direct-cut operation or alien frequencies direct-cut operation, if then carry out step 3 with the frequency direct-cut operation;
Step 2 judges whether the Traffic Channel of Serving cell is identical with the employed channel of different-frequency measure, if identical, then should the group step finish;
Step 3 is carried out down-going synchronous to Target cell, and flag bit is set;
Second group:
Step 4 judges whether to arrive activationary time, if arrived activationary time, then carries out step 5, if also do not arrive activationary time, then continues to wait for;
Step 5, disconnection is connected with Serving cell;
Step 6 judges whether to finish the Target cell down-going synchronous, if finish, then carries out step 9;
Step 7 judges whether to begin the Target cell down-going synchronous, if begin, then carries out step 7, otherwise carries out step 8;
Step 8 is done down-going synchronous to Target cell;
Step 9 obtains the System Frame Number of Target cell;
In above-mentioned steps, first group and second group of step are carried out simultaneously.
Wherein, in step 2, judge whether the dedicated channel of Serving cell is TS0, if then finish first group of step.
Wherein, step 3 comprises the steps:
A. Target cell is carried out down-going synchronous, and this flag bit is set is that down-going synchronous is carried out state;
B. after finishing the Target cell down-going synchronous, it is the down-going synchronous completion status that this flag bit is set.
Wherein, this flag bit is eight unsigned numbers, represents down-going synchronous for different value and does not carry out state, down-going synchronous and carry out state and down-going synchronous completion status by it is set.
Technical scheme of the present invention also comprises a kind of direct-cut operation equipment that is used for the described method for hard switching of claim 1, comprise: a control device, a presynchronization device, a switching operating device, this control device starts this presynchronization device and this switching operating device simultaneously, this presynchronization device carries out down-going synchronous to Target cell before switching, this switching operating device is being carried out handover operation behind activationary time.
Wherein, this presynchronization device comprises one first judgment means, one second judgment means, a presynchronization final controlling element, same direct-cut operation frequently still was the alien frequencies direct-cut operation when this first judgment means was judged the switching that will carry out, if with the frequency direct-cut operation, then start this presynchronization final controlling element, if alien frequencies direct-cut operation, then start this second judgment means, this second judgment means judges whether the Traffic Channel of Serving cell is identical with the channel of different-frequency measure, if difference then start this presynchronization final controlling element, if it is identical, then finish, Target cell is carried out down-going synchronous to Target cell downlink synchronization device of this presynchronization final controlling element startup and record carries out synchronous state to Target cell.
Wherein, this second judgment means judges whether the Traffic Channel of Serving cell is TS0, if not, starting this presynchronization final controlling element, if then finish.
Wherein, this presynchronization final controlling element writes down the state that Target cell is carried out down-going synchronous by flag bit is set, this flag bit is eight unsigned numbers, and the state of described down-going synchronous comprises: down-going synchronous is not carried out state, down-going synchronous is carried out state, down-going synchronous completion status.
Wherein, this switching operating device comprises an activationary time judgment means, a switching final controlling element, this activationary time judgment means judges whether to arrive activationary time, if arrived activationary time, then start this switching final controlling element, should and switch the link of final controlling element disconnection earlier and Serving cell, judge whether to carry out the Target cell down-going synchronous then, if do not carry out the Target cell down-going synchronous, then starting a Target cell downlink synchronization device carries out descending to Target cell, start a System Frame Number reading device after finishing and read the Target cell System Frame Number, read the Target cell System Frame Number if then directly start a System Frame Number reading device, after obtaining the Target cell System Frame Number, this switching final controlling element starts a Target cell uplink synchronous device Target cell is done uplink synchronous.
Technical scheme of the present invention comprises a kind of TD-SCDMA system again, comprises the direct-cut operation device that at least one merchant states, and uses above-mentioned method for hard switching to carry out direct-cut operation in this system.
Positive progressive effect of the present invention is: because the present invention utilizes the activationary time of physical channel reconfigure command and the interval of current time, carry out the Target cell down-going synchronous in advance, therefore, after activationary time arrives, do not need to carry out the Target cell down-going synchronous, thereby reduced the time of interrupting that direct-cut operation produced, improved the speech quality of TD-SCDMA system.
Description of drawings
Fig. 1 is the flow chart of existing direct-cut operation.
Fig. 2 is among the present invention, the flow chart of first group of step of method for hard switching
Fig. 3 is among the present invention, the flow chart of second group of step of method for hard switching.
Fig. 4 is the module map of direct-cut operation device among the present invention
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
First embodiment
A kind of method for hard switching that is used for the TD-SCDMA system, terminal carry out following two groups of steps of carrying out simultaneously after receiving the physical channel reconfigure command:
As shown in Figure 2, first group of step comprises:
As shown in figure 30, second group of step comprises:
In the present embodiment, utilize the interval of activationary time and current time, carry out first group of step, so that Target cell is carried out down-going synchronous.
Second embodiment
As shown in Figure 3, a kind of direct-cut operation equipment, comprise: control device 1, presynchronization device 2, a switching operating device 3, this control device 1 starts this presynchronization device 2 and this switching operating device 3 simultaneously, this presynchronization device 2 carries out down-going synchronous to Target cell before switching, this switching operating device 3 is being carried out handover operation behind activationary time.
Wherein, this presynchronization device 2 comprises one first judgment means 21, one second judgment means 22, a presynchronization final controlling element 23.
Still be the alien frequencies direct-cut operation with direct-cut operation frequently when this first judgment means 11 is judged the switching that will carry out, if frequency direct-cut operation together then starts this presynchronization final controlling element 23, if the alien frequencies direct-cut operation then starts this second judgment means 22.
This second judgment means 22 judges whether the Traffic Channel of Serving cell is identical with the channel of different-frequency measure, because the channel of different-frequency measure is on TS0, therefore this second judgment means 22 judges that the Traffic Channel of Serving cell is whether on TS0, if not then starting this presynchronization final controlling element 23, if identical, then finish.
This presynchronization final controlling element 23 starts an existing Target cell downlink synchronization device Target cell is carried out down-going synchronous, and, flag bit writes down the state that Target cell is carried out down-going synchronous by being set, this flag bit is eight unsigned numbers, and the state of described down-going synchronous comprises: down-going synchronous is not carried out state, down-going synchronous is carried out state, down-going synchronous completion status.
Wherein, this switching operating device 3 comprises an activationary time judgment means 31, a switching final controlling element 32.
This activationary time judgment means 31 judges whether to arrive activationary time, if arrived activationary time, then starts this switching final controlling element 32.
This switches, and final controlling element 32 disconnects earlier and the link of Serving cell, judge whether to carry out the Target cell down-going synchronous then, if do not carry out the Target cell down-going synchronous, then start an existing Target cell downlink synchronization device Target cell is carried out down-going synchronous, start an existing systems frame number reading device after finishing and read the Target cell System Frame Number, read the Target cell System Frame Number if then directly start a described System Frame Number reading device, restart the System Frame Number reading device and read the Target cell System Frame Number if carrying out down-going synchronous then waiting for that down-going synchronous is finished, after obtaining the Target cell System Frame Number, this switching final controlling element starts an existing Target cell uplink synchronous device Target cell is done uplink synchronous.
The 3rd embodiment
A kind of TD-SCDMA system, this system comprises at least one above-mentioned direct-cut operation equipment, and uses above-mentioned method for hard switching to carry out direct-cut operation in this system, figure does not show.
In first, second embodiment; can in these eight unsigned numbers, select some bits to come mark down-going synchronous state as required; and described flag bit also can be selected the parameter of other types as required; be used for record and expression down-going synchronous state; these variations all are included within the present invention's scope required for protection, therefore repeat no more.
Claims (10)
1, a kind of method for hard switching comprises following two groups of steps:
First group:
Step 1, judgement are with frequency direct-cut operation or alien frequencies direct-cut operation, if then carry out step 3 with the frequency direct-cut operation;
Step 2 judges whether the Traffic Channel of Serving cell is identical with the employed channel of different-frequency measure, if identical, then should the group step finish;
Step 3 is carried out down-going synchronous to Target cell, and flag bit is set;
Second group:
Step 4 judges whether to arrive activationary time, if arrived activationary time, then carries out step 5, if also do not arrive activationary time, then continues to wait for;
Step 5, disconnection is connected with Serving cell;
Step 6 judges whether to finish the Target cell down-going synchronous, if finish, then carries out step 9;
Step 7 judges whether to begin the Target cell down-going synchronous, if begin, then carries out step 7, otherwise carries out step 8;
Step 8 is done down-going synchronous to Target cell;
Step 9 obtains the System Frame Number of Target cell;
Step 10 is done uplink synchronous to Target cell;
In above-mentioned steps, first group and second group of step are carried out simultaneously.
2, method for hard switching according to claim 1 is characterized in that, in step 2, judges whether the dedicated channel of Serving cell is TS0, if then finish first group of step.
3, method for hard switching according to claim 2 is characterized in that, step 3 comprises the steps:
A. Target cell is carried out down-going synchronous, and this flag bit is set is that down-going synchronous is carried out state;
B. after finishing the Target cell down-going synchronous, it is the down-going synchronous completion status that this flag bit is set.
4, method for hard switching according to claim 2 is characterized in that, this flag bit is eight unsigned numbers, represents down-going synchronous for different value and does not carry out state, down-going synchronous and carry out state and down-going synchronous completion status by it is set.
5, a kind of direct-cut operation equipment that is used for the described method for hard switching of claim 1, it is characterized in that, it comprises: a control device, a presynchronization device, a switching operating device, this control device starts this presynchronization device and this switching operating device simultaneously, this presynchronization device carries out down-going synchronous to Target cell before switching, this switching operating device is being carried out handover operation behind activationary time.
6, direct-cut operation equipment according to claim 5, it is characterized in that, this presynchronization device comprises one first judgment means, one second judgment means, a presynchronization final controlling element, same direct-cut operation frequently still was the alien frequencies direct-cut operation when this first judgment means was judged the switching that will carry out, if with the frequency direct-cut operation, then start this presynchronization final controlling element, if alien frequencies direct-cut operation, then start this second judgment means, this second judgment means judges whether the Traffic Channel of Serving cell is identical with the channel of different-frequency measure, if difference then start this presynchronization final controlling element, if it is identical, then finish, Target cell is carried out down-going synchronous to Target cell downlink synchronization device of this presynchronization final controlling element startup and record carries out synchronous state to Target cell.
7, direct-cut operation equipment according to claim 6 is characterized in that, this second judgment means judges whether the Traffic Channel of Serving cell is TS0, if not, starting this presynchronization final controlling element, if then finish.
8, direct-cut operation equipment according to claim 7, it is characterized in that, this presynchronization final controlling element writes down the state that Target cell is carried out down-going synchronous by flag bit is set, this flag bit is eight unsigned numbers, and the state of described down-going synchronous comprises: down-going synchronous is not carried out state, down-going synchronous is carried out state, down-going synchronous completion status.
9, direct-cut operation equipment according to claim 8, it is characterized in that, this switching operating device comprises an activationary time judgment means, a switching final controlling element, this activationary time judgment means judges whether to arrive activationary time, if arrived activationary time, then start this switching final controlling element, should and switch the link of final controlling element disconnection earlier and Serving cell, judge whether to carry out the Target cell down-going synchronous then, if do not carry out the Target cell down-going synchronous, then starting a Target cell downlink synchronization device carries out descending to Target cell, start a System Frame Number reading device after finishing and read the Target cell System Frame Number, read the Target cell System Frame Number if then directly start a System Frame Number reading device, after obtaining the Target cell System Frame Number, this switching final controlling element starts a Target cell uplink synchronous device Target cell is done uplink synchronous.
10, a kind of TD-SCDMA system is characterized in that this system comprises the described direct-cut operation device of at least one claim 4, and uses the described method for hard switching of claim 1 to carry out direct-cut operation in this system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100274623A CN100534233C (en) | 2005-06-30 | 2005-06-30 | Hard handoff method and device and TD-SCDMA system using same method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100274623A CN100534233C (en) | 2005-06-30 | 2005-06-30 | Hard handoff method and device and TD-SCDMA system using same method and device |
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| CN1735271A true CN1735271A (en) | 2006-02-15 |
| CN100534233C CN100534233C (en) | 2009-08-26 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009079817A1 (en) * | 2007-12-12 | 2009-07-02 | Zte Corporation | Base station handoff method |
| CN101119586B (en) * | 2006-08-04 | 2010-05-12 | 中兴通讯股份有限公司 | Method of implementing high speed downlink sharing channel inter-cell handoff |
| CN101179370B (en) * | 2006-11-10 | 2010-05-12 | 大唐移动通信设备有限公司 | Signal synchronous transmission method, system and device |
| CN101193412B (en) * | 2006-11-21 | 2010-12-08 | 中兴通讯股份有限公司 | Method for shortening reading time of system frame number in item-reestablishment hard switch |
| CN101207925B (en) * | 2007-12-13 | 2010-12-08 | 上海华为技术有限公司 | Switch method, exchange equipment and terminal equipment |
| WO2012037704A1 (en) * | 2010-09-21 | 2012-03-29 | Telefonaktiebolaget L M Ericsson (Publ) | Air-interface timing synchronization sharing |
| CN105992286A (en) * | 2015-02-02 | 2016-10-05 | 苏州简约纳电子有限公司 | District synchronization method when LTE terminal switches districts and LTE terminal |
-
2005
- 2005-06-30 CN CNB2005100274623A patent/CN100534233C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119586B (en) * | 2006-08-04 | 2010-05-12 | 中兴通讯股份有限公司 | Method of implementing high speed downlink sharing channel inter-cell handoff |
| CN101179370B (en) * | 2006-11-10 | 2010-05-12 | 大唐移动通信设备有限公司 | Signal synchronous transmission method, system and device |
| CN101193412B (en) * | 2006-11-21 | 2010-12-08 | 中兴通讯股份有限公司 | Method for shortening reading time of system frame number in item-reestablishment hard switch |
| WO2009079817A1 (en) * | 2007-12-12 | 2009-07-02 | Zte Corporation | Base station handoff method |
| CN101207925B (en) * | 2007-12-13 | 2010-12-08 | 上海华为技术有限公司 | Switch method, exchange equipment and terminal equipment |
| WO2012037704A1 (en) * | 2010-09-21 | 2012-03-29 | Telefonaktiebolaget L M Ericsson (Publ) | Air-interface timing synchronization sharing |
| US9215679B2 (en) | 2010-09-21 | 2015-12-15 | Telefonaktiebolaget L M Ericsson (Publ) | Air-interface timing synchronization sharing |
| CN105992286A (en) * | 2015-02-02 | 2016-10-05 | 苏州简约纳电子有限公司 | District synchronization method when LTE terminal switches districts and LTE terminal |
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| Publication number | Publication date |
|---|---|
| CN100534233C (en) | 2009-08-26 |
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