CN102857964B - Terminal switching method and device - Google Patents
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- CN102857964B CN102857964B CN201110176027.2A CN201110176027A CN102857964B CN 102857964 B CN102857964 B CN 102857964B CN 201110176027 A CN201110176027 A CN 201110176027A CN 102857964 B CN102857964 B CN 102857964B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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Abstract
The invention discloses a terminal switching method and device for avoiding service interruption of a terminal. The method comprises the following steps of: after a source eNB (evolved Node B) determines that UE (user equipment) needs switching, determining the number N of the switching commands sent to the UE according to a measurement report reported by the UE; and in the switching process of the UE, sending N switching commands to the UE. The device is located in the eNB and comprises a switching command number determining module and a switching command sending module. The method and device disclosed by the embodiment of the invention judge the signal quality of a service cell and a neighbor and decide whether to send multiple switching commands for the same switching so as to ensure that the UE can receive the switching command in time to increase the switching success rate; and moreover, the UE can be synchronized in the target cell as soon as possible so as to reduce the switching delay and enhance the user experience in the switching process.
Description
Technical field
The present invention relates to moving communicating field and in particular to a kind of terminal switching method and device.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system using network control, UE assist by the way of, for reality
Existing lossless seamless switching, needs to try one's best and reduces the break period, avoid data degradation as far as possible.
Switching flow is as follows：
1st, reported according to the measurement that RRC (Radio Resource Control, wireless heterogeneous networks) reallocation message specifies
Criterion, UE (User Equipment, user terminal, abbreviation terminal) sends measurement report (Measurement Report) message
To evolution NodeB (Evolved NodeB, abbreviation eNB)；
2nd, source eNodeB is based on measurement report and RRM (RRM) algorithm and determines switching target small area, and by UE
Contextual information (Ue Context) be sent collectively to the eNodeB of switching target small area with handover request；
3rd, target eNodeB will be pre-assigned to C-RNTI (Cell Radio Network Temporary Identifier/Identity, Cell-RNTI) and the other specification of switching UE
(access parameter, SIB (system information block) etc.) confirms to return to source in (Context Confirm) message in context
ENodeB, source eNodeB, after receiving context acknowledgement message, data are forwarded a packet to target eNodeB, and source eNodeB sends out to UE
Send switching command (HandOver Command)；
4th, UE receives switching command, according to the Target Cell Identifier carrying in switching command, departs from and and mesh from cell-of-origin
Mark eNB sets up uplink synchronous；
5th, target eNodeB returns TA (Timing Advance) the resource location to UE instruction distribution, and UE is to target eNodeB
Return switching and complete (HandOver Comfirm) message；
6th, target eNodeB completes to source eNodeB instruction switching, and source eNodeB empties and has been forwarded to target eNodeB
Data.
But in actual moving process, the situation that UE can not receive switching command and leads to service disconnection usually occurs.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of method and device of terminal switching, it is to avoid in the business of terminal
Disconnected.
For solving above-mentioned technical problem, the invention provides a kind of method of terminal switching, including：
Source evolved base station (eNB) after determining that user equipment (UE) needs switching, the measurement report that reported according to described UE
Accuse number N determining the switching command sending to described UE；In the handoff procedure of described UE, send N number of switching to described UE
Order.
Further, the described number determining the switching command sending to described UE according to the measurement report that described UE reports
N, including：
Determine number N of the switching command sending to described UE according to the measurement event that described UE reports, or, according to institute
The signal quality stating the measurement event that UE reports and current service cell determines the number of the switching command sending to described UE
N.
Further, the described number determining the switching command sending to described UE according to the measurement event that described UE reports
N, including：When the measurement event that described UE reports is A5, determine switching command number N >=2 sending to UE.
Further, N=3.
Further, the signal quality of the described measurement event being reported according to described UE and current service cell determine to
Number N of the switching command that described UE sends, including：
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is more than first
Limit is it is determined that N=A；Or
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is less than first
Limit, more than the second thresholding it is determined that N=B；Or
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is less than second
Limit is it is determined that N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.
Further, the signal quality of described current service cell includes：Reference Signal Received Power (RSRP) or reference
Signal receiving quality (RSRQ).
For solving above-mentioned technical problem, present invention also offers a kind of device of terminal switching, positioned at evolved base station
(eNB), including switching command number determining module and switching command sending module, wherein：
Described switching command number determining module, for after determining that user equipment (UE) needs switching, according to described UE
The measurement report reporting determines number N of the switching command sending to described UE；
Described switching command sending module, for, in the handoff procedure of described UE, sending N number of switching life to described UE
Order.
Further, described switching command number determining module is the measurement report for being reported according to UE in the following ways
Accuse number N determining the switching command sending to UE：
Determine number N of the switching command sending to described UE according to the measurement event that described UE reports, or, according to institute
The signal quality stating the measurement event that UE reports and current service cell determines the number of the switching command sending to described UE
N.
Further, described switching command number determining module is the measurement thing for being reported according to UE in the following ways
Part determines number N of the switching command sending to UE：When the measurement event that UE reports is A5, described switching command number determines
Module determines switching command number N >=2 sending to UE.
Further, N=3.
Further, described switching command number determining module is the measurement thing for being reported according to UE in the following ways
The signal quality of part and current service cell determines number N of the switching command sending to UE：
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is more than the first thresholding,
Then determine N=A；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the first thresholding,
More than the second thresholding it is determined that N=B；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the second thresholding,
Then determine N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.
Further, the signal quality of described current service cell includes：Reference Signal Received Power (RSRP) or reference
Signal receiving quality (RSRQ).
Present invention method and device on the basis of existing technology, for once switching, are serviced by judgement
Cell and the signal quality of adjacent area, decide whether to issue multiple switching commands it is ensured that UE can receive switching command in time, increase
Handover success rate, makes UE synchronous in Target cell as early as possible, thus reducing handover delay, strengthens the Consumer's Experience in handoff procedure.
Brief description
Fig. 1 is switching command setting procedure figure during A3 event for measurement event；
Fig. 2 issues process chart for the embodiment of the present invention 1 switching command；
Fig. 3 is the switching command setting procedure figure that the embodiment of the present invention 3 measurement event is during A5 event.
Specific embodiment
, being found, source eNodeB issues after switching command to UE to existing switching flow analysis, UE at this moment is generally in little
Area edge, signal quality poor it is more likely that occur HARQ (mixed automatic retransfer) or RLC (wireless spread-spectrum technology) layer weight
Pass and can not receive switching command or receive switching command phenomenon too late it is easy to UE occurs.And because LTE system switching belongs to
After switch, to UE send switching command when, target eNodeB distributes resource to UE, if UE can not receive switching command or
Receive switching command too late, just cannot be synchronized to Target cell, thus leading to service disconnection.
For this situation of prior art, the present embodiment proposes below scheme：
Source eNB, after determining that UE needs switching, determines to cutting that described UE sends according to the measurement report that described UE reports
Change number N of order；In the handoff procedure of described UE, send N number of switching command to described UE.N is >=1 positive integer.
If due to reasons such as cell signal quality, first switching command there occurs that rlc layer retransmits or MAC layer HARQ weight
Pass, at this moment if there are new switching command, the switching command that new switching command is possible to than retransmitting is received by UE earlier, makes
UE is synchronous in Target cell as early as possible, thus reducing handover delay, it is to avoid service disconnection, strengthens the Consumer's Experience in handoff procedure.
Preferably, source eNB can determine the switching command to described UE transmission according to the measurement event that described UE reports
Number N, or, the measurement event being reported according to described UE and the signal quality of current service cell determine to described UE transmission
Switching command number N.
Specifically, for example：What UE reported is A5 measurement event, and A5 measurement event is defined as serving cell signal and is less than one
Individual thresholding, neighboring area signal is higher than a thresholding.At this moment illustrate that this UE serving cell signal quality is poor, neighboring cell signal quality is good, then
Determine switching command number N >=2 sending to UE, preferably N=3, that is, issue 3 switching commands to UE.
If what UE reported is A3 measurement event, and A3 measurement event is defined as neighboring cell signal quality parameter and Serving cell
The difference of signal quality parameter is more than a thresholding.At this moment serving cell signal is not necessarily very poor, then reported according to UE further
The signal quality of current service cell sends the number of switching command to determine, principle is：If serving cell signal, is cut very well
Change order to avoid the need for repeatedly sending, otherwise repeatedly issue switching command.Specifically：
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is more than the first thresholding,
Then determine N=A；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that reports of UE to be less than the first thresholding big
In the second thresholding it is determined that N=B；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the second thresholding,
Then determine N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.The preferably span of A is
[3,5], the span of B is [2,3]
It is illustrated as a example the signal quality of current service cell using RSRP (Reference Signal Received Power)：
If the RSRP of UE is more than 100dBm, this UE is likely located at cell edge, determines N=3；
If the RSRP of UE is less than 100dBm but be more than 90dBm, this UE be likely located at center of housing estate and cell edge it
Between, determine N=2；
If the RSRP of UE is less than 90dBm, this UE is likely located at center of housing estate, determines N=1.
Can be realized using flow process as shown in Figure 1 but it is also possible to be realized using other flow processs during execution.
In addition to using RSRP, also can be used as working as using RSRQ (Reference Signal Received Quality) in other embodiments
The signal quality of front Serving cell.First, second, third threshold value being used during using RSRQ, refers to the thresholding of RSRP
Value.
The device positioned at eNB realizing said method includes switching command number determining module and switching command transmission mould
Block, wherein：
Described switching command number determining module, for the measurement report after determining that UE needs switching, being reported according to this UE
Accuse number N determining the switching command sending to this UE；
Described switching command sending module, for, in the handoff procedure of this UE, sending N number of switching command to this UE.
Preferably, described switching command number determining module is the measurement report for being reported according to UE in the following ways
Determine number N of the switching command sending to UE：Determine the switching sending to described UE according to the measurement event that described UE reports
Number N of order, or, the measurement event being reported according to described UE and the signal quality of current service cell determine to described
Number N of the switching command that UE sends.
Preferably, described switching command number determining module is the measurement event for being reported according to UE in the following ways
Determine number N of the switching command sending to UE：When the measurement event that UE reports is A5, described switching command number determines mould
Block determines switching command number N >=2 sending to UE, preferably N=3.
Preferably, described switching command number determining module is the measurement event for being reported according to UE in the following ways
And the signal quality of current service cell determines number N of the switching command sending to UE：
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is more than the first thresholding,
Then determine N=A；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the first thresholding,
More than the second thresholding it is determined that N=B；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the second thresholding,
Then determine N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case of not conflicting, in embodiment in the application and embodiment
Feature can mutual combination in any.
Embodiment 1：
Step 110, UE sends measurement report to eNodeB；
Step 120, eNodeB is based on measurement report and RRM algorithm determines switching target small area, and the context letter by UE
Breath is sent collectively to the eNodeB of switching target small area with handover request；
Step 130, target eNodeB will be pre-assigned to C-RNTI and the other specification (access parameter, SIB etc.) of switching UE
Source eNodeB is returned in context acknowledgement message；
Step 140, source eNodeB, after receiving context acknowledgement message, data is forwarded a packet to target eNodeB；
Step 150, source eNodeB judges that the measurement event in UE measurement report is A3, and the Serving cell that reports of UE
RSRP value is more than 100dBm it is determined that the number of times sending switching command is 3 times；
Step 160, source eNodeB sends switching command according to the transmission times determining to UE；
Specifically, source eNodeB can realize by the way of intervalometer is with reference to enumerator, and for example source eNodeB can set
Putting switching command transmitting counter (HoTime) sum is 3, and a time span is the switching command retransmission timer of Ts,
Realized using flow process shown in Fig. 2, including：
Step a, source eNodeB sends a switching command to UE, and switching command transmitting counter adds one；
Step b, starts switching command retransmission timer；
Step c, judges whether switching command retransmission timer is overtime, if it is, execution step d, if it is not, returning step
Rapid c；
Step d, judges whether switching command transmitting counter is equal to switching command transmitting counter sum, if it is,
Terminate, if it is not, return to step a.
Realize only a kind of citing by the way of intervalometer is with reference to enumerator in the present embodiment, in other embodiments,
Can be realized using other known methods.
Step 170, UE receives switching command, starts the uplink synchronous process of target eNodeB, simultaneously to target eNodeB
Obtain up TA；
Step 180, target eNodeB returns TA the resource location to UE instruction distribution to UE, and UE returns to target eNodeB
Switchback is changed and is completed (HandOver Comfirm) message；
Step 190, target eNodeB completes to source eNodeB instruction switching, and source eNodeB empties and has been forwarded to target
The data of eNodeB.
Embodiment 2：
Step 210, UE sends measurement report to eNodeB；
Step 220, eNodeB is based on measurement report and RRM algorithm determines switching target small area, and the context letter by UE
Breath is sent collectively to the eNodeB of switching target small area with handover request；
Step 230, target eNodeB will be pre-assigned to C-RNTI and the other specification (access parameter, SIB etc.) of switching UE
Source eNodeB is returned in context acknowledgement message；
Step 240, source eNodeB, after receiving context acknowledgement message, data is forwarded a packet to target eNodeB；
Step 250, source eNodeB judges that the measurement event in UE measurement report is A3, and the Serving cell that reports of UE
RSRP value is less than 90dBm it is determined that the number of times sending switching command is 1 time；
Step 260, source eNodeB sends switching command according to the transmission times determining to UE；
Concrete operations are referring to the description in embodiment 1.
Step 270, UE receives switching command, starts the uplink synchronous process of target eNodeB, simultaneously to target eNodeB
Obtain up TA；
Step 280, target eNodeB returns TA the resource location to UE instruction distribution to UE, and UE returns to target eNodeB
Return handoff completion message；
Step 290, target eNodeB completes to source eNodeB instruction switching, and source eNodeB empties and has been forwarded to target
The data of eNodeB.
Embodiment 3：
Step 310, UE sends measurement report to eNodeB；
Step 320, eNodeB is based on measurement report and RRM algorithm determines switching target small area, and the context letter by UE
Breath is sent collectively to the eNodeB of switching target small area with handover request；
Step 330, target eNodeB will be pre-assigned to C-RNTI and the other specification (access parameter, SIB etc.) of switching UE
Source eNodeB is returned in context acknowledgement message；
Step 340, source eNodeB, after receiving context acknowledgement message, data is forwarded a packet to target eNodeB；
Step 350, source eNodeB judge measurement event in UE measurement report for A5 it is determined that send switching command time
Number is 3 times；
The flow process of setting switching command is as shown in Figure 3.
Step 360, source eNodeB sends switching command according to the transmission times determining to UE；
Concrete operations are referring to the description in embodiment 1.
Step 370, UE receives switching command, starts the uplink synchronous process of target eNodeB, simultaneously to target eNodeB
Obtain up TA；
Step 380, target eNodeB returns TA the resource location to UE instruction distribution to UE, and UE returns to target eNodeB
Return handoff completion message；
Step 390, target eNodeB completes to source eNodeB instruction switching, and source eNodeB empties and has been forwarded to target
The data of eNodeB.
One of ordinary skill in the art will appreciate that all or part of step in said method can be instructed by program
Related hardware completes, and described program can be stored in computer-readable recording medium, such as read only memory, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be to be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly, the present invention also can have other various embodiments, in the case of without departing substantially from present invention spirit and its essence, ripe
Know those skilled in the art and work as and various corresponding changes and deformation can be made according to the present invention, but these corresponding changes and change
Shape all should belong to the protection domain of appended claims of the invention.
Claims (8)
1. a kind of method of terminal switching, including：
Source evolved base station (eNB) is after determining that user equipment (UE) needs switching, true according to the measurement report that described UE reports
Orient number N of the switching command that described UE sends；In the handoff procedure of described UE, send N number of switching command to described UE；
Wherein, number N of the switching command sending to described UE is determined according to the measurement report that described UE reports, including：
Determine number N of the switching command sending to described UE according to the measurement event that described UE reports, or, according to described UE
The measurement event reporting and the signal quality of current service cell determine number N of the switching command sending to described UE.
2. the method for claim 1 it is characterised in that：
Described number N determining the switching command sending to described UE according to the measurement event that described UE reports, including：
When the measurement event that described UE reports is A5, determine switching command number N >=2 sending to UE, preferably N=3.
3. the method for claim 1 it is characterised in that：
The signal quality of the described measurement event being reported according to described UE and current service cell determines and sends to described UE
Number N of switching command, including：
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is more than the first thresholding,
Then determine N=A；Or
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is less than the first thresholding,
More than the second thresholding it is determined that N=B；Or
The measurement event reporting as described UE is A3, and the signal quality of current service cell that UE reports is less than the second thresholding,
Then determine N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.
4. method as claimed in claim 3 it is characterised in that：
The signal quality of described current service cell includes：Reference Signal Received Power (RSRP) or Reference Signal Received Quality
(RSRQ).
5. a kind of device of terminal switching, positioned at evolved base station (eNB), including switching command number determining module and switching life
Make sending module, wherein：
Described switching command number determining module, for, after determining that user equipment (UE) needs switching, reporting according to described UE
Measurement report determine to described UE send switching command number N；
Described switching command number determining module is to send out to UE for being determined according to the measurement report that UE reports in the following ways
Number N of the switching command sending：
Determine number N of the switching command sending to described UE according to the measurement event that described UE reports, or, according to described UE
The measurement event reporting and the signal quality of current service cell determine number N of the switching command sending to described UE；
Described switching command sending module, for, in the handoff procedure of described UE, sending N number of switching command to described UE.
6. device as claimed in claim 5 it is characterised in that：
Described switching command number determining module is to send out to UE for being determined according to the measurement event that UE reports in the following ways
Number N of the switching command sending：
When the measurement event that UE reports is A5, described switching command number determining module determines the switching command sending to UE
Number N >=2, preferably N=3.
7. device as claimed in claim 5 it is characterised in that：
Described switching command number determining module is the measurement event and current clothes for being reported according to UE in the following ways
The signal quality of business cell determines number N of the switching command sending to UE：
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is more than the first thresholding, then really
Determine N=A；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the first thresholding, is more than
Second thresholding is it is determined that N=B；Or
The measurement event reporting as UE is A3, and the signal quality of current service cell that UE reports is less than the second thresholding, then really
Determine N=C；
Wherein first thresholding ＞ the second thresholding ＞ the 3rd thresholding, described A ＞ B ＞ C >=1.
8. device as claimed in claim 7 it is characterised in that：
The signal quality of described current service cell includes：Reference Signal Received Power (RSRP) or Reference Signal Received Quality
(RSRQ).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110176027.2A CN102857964B (en) | 2011-06-28 | 2011-06-28 | Terminal switching method and device |
| PCT/CN2011/082604 WO2013000235A1 (en) | 2011-06-28 | 2011-11-22 | Method and apparatus for handoff of terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110176027.2A CN102857964B (en) | 2011-06-28 | 2011-06-28 | Terminal switching method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102857964A CN102857964A (en) | 2013-01-02 |
| CN102857964B true CN102857964B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110176027.2A Expired - Fee Related CN102857964B (en) | 2011-06-28 | 2011-06-28 | Terminal switching method and device |
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| CN (1) | CN102857964B (en) |
| WO (1) | WO2013000235A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10091699B2 (en) * | 2013-02-13 | 2018-10-02 | Qualcomm Incorporated | Handover decisions based on absolute channel quality of serving cell |
| CN104053197A (en) * | 2013-03-15 | 2014-09-17 | 中国移动通信集团公司 | Aircraft switching method in ground-air long term evolution system, and base station and aircraft |
| CN103731891B (en) * | 2013-12-27 | 2017-08-29 | 上海华为技术有限公司 | control method and device |
| WO2020061899A1 (en) * | 2018-09-27 | 2020-04-02 | 华为技术有限公司 | Cell switching method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008133579A1 (en) * | 2007-04-27 | 2008-11-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover using dedicated resources reserved for a limited time interval |
| CN101466127A (en) * | 2008-12-30 | 2009-06-24 | 上海无线通信研究中心 | District switching method capable of improving switching success rate |
| CN101877895A (en) * | 2009-04-30 | 2010-11-03 | 大唐移动通信设备有限公司 | Cell switching method and system |
| CN102084687A (en) * | 2008-07-04 | 2011-06-01 | 爱立信电话股份有限公司 | Adaptation of handover command size in a mobile telecommunication network |
-
2011
- 2011-06-28 CN CN201110176027.2A patent/CN102857964B/en not_active Expired - Fee Related
- 2011-11-22 WO PCT/CN2011/082604 patent/WO2013000235A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008133579A1 (en) * | 2007-04-27 | 2008-11-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover using dedicated resources reserved for a limited time interval |
| CN102084687A (en) * | 2008-07-04 | 2011-06-01 | 爱立信电话股份有限公司 | Adaptation of handover command size in a mobile telecommunication network |
| CN101466127A (en) * | 2008-12-30 | 2009-06-24 | 上海无线通信研究中心 | District switching method capable of improving switching success rate |
| CN101877895A (en) * | 2009-04-30 | 2010-11-03 | 大唐移动通信设备有限公司 | Cell switching method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013000235A1 (en) | 2013-01-03 |
| CN102857964A (en) | 2013-01-02 |
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