CN102740347A - Method, apparatus and system for acquiring signal quality information of unknown neighbor - Google Patents
Method, apparatus and system for acquiring signal quality information of unknown neighbor Download PDFInfo
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Abstract
The invention provides a method, an apparatus and a system for acquiring signal quality information of an unknown neighbor. The method for acquiring signal quality information of the unknown neighbor comprises that: UE receives a measuring task sent by an eNodeB of reporting a CGI of the unknown neighbor; the UE measures the CGI of the unknown neighbor according to the measurement task and acquires the signal quality information of the unknown neighbor; the UE reports a CGI measurement report to the eNodeB, wherein the CGI measurement report carries the signal quality information of the unknown neighbor. According to the invention, the signal quality information of the unknown neighbor is carried when the CGI measurement report of the unknown neighbor is reported, which not only ensures the accuracy of the signal quality information of the neighbor under a PCI misidentification circumstance, but also avoids additional interaction between the UE and the eNodeB, thereby reducing air interface signaling overhead.
Description
Technical Field
The invention relates to the field of communication, in particular to a method, a device and a system for acquiring signal quality information of an unknown neighbor cell.
Background
To address the problems in the related art, no effective solution has been proposed.
In an LTE (Long Term Evolution) system, an Automatic neighbor relation ANR (Automatic neighbor relation) is an important component of an SON (Self-Organizing Network) function, which is to acquire necessary measurement information from a UE and to implement configuration automation of a neighbor relation. When the UE measures and reports an unknown cell (a cell that does not have a neighboring cell relationship with the serving cell), whether to automatically configure the unknown cell as the neighboring cell of the serving cell may refer to a plurality of indexes according to an algorithm policy, where signal quality is one of important reference indexes that can optimize the neighboring cell relationship of the serving cell configured by the ANR function.
Currently, in an LTE system, the situation that a base station obtains neighboring cell signal quality information through UE measurement and reporting is as follows: the trigger type of the measurement configuration is event or the trigger type of the measurement configuration is periodic, and the periodic measurement purpose is set to report the strongest cell.
According to the existing signal quality information acquisition approaches, when the ANR is performing automatic neighbor relation processing, there are two methods for acquiring signal quality information:
1. and using the signal quality information carried by the UE when reporting the unknown PCI (Physical Cell Identity).
2. And using a special air interface process to ensure that the UE measures and reports the signal quality information.
These two methods are briefly described below.
The method comprises the following steps: as shown in fig. 1, the method comprises the following steps:
step S102, issuing configuration to the UE through the RRCConnectionReconfiguration message, and performing neighbor cell discovery measurement, where a trigger type of the measurement configuration is an event (or the trigger type is a period, and a measurement purpose is to report a strongest cell).
And step S104, the UE sends a measurement report to the eNodeB through the MeasurementReport, and if the measurement report carries the unknown neighboring cell and the signal quality information, the eNodeB locally records the signal quality information of the unknown cell.
Step S106, the eNodeB configures the UE through the RRCConnectionReconfiguration message, and performs CGI (Cell Global Identity) measurement of the unknown neighboring Cell.
Step S108, the UE reports the CGI information of the unknown neighboring cell through the MeasurementReport.
In step S110, the eNodeB reports the CGI information of the unknown neighboring cell and the signal quality information stored in step S104 to an OMC (Operation Maintenance Center) for use as input information of an ANR automatic neighboring cell relation processing algorithm policy.
The method 2 comprises the following steps: as shown in fig. 2, the method comprises the following steps:
step S202, issuing configuration to the UE through the RRCConnectionReconfiguration message, and performing neighbor cell discovery measurement, where a trigger type of the measurement configuration is an event (or the trigger type is a period, and a measurement purpose is to report a strongest cell).
In step S204, the UE sends a measurement report to the eNodeB.
Step S206, if the measurement report carries the unknown neighboring cell, the eNodeB configures the UE through the RRCConnectionReconfiguration message, and performs CGI measurement on the unknown neighboring cell.
Step S208, the UE reports the CGI information of the unknown neighboring cell through the MeasurementReport, and the eNodeB records the CGI information of the unknown neighboring cell.
Step S210, the eNodeB reconfigures the UE through the RRCConnectionReconfiguration message, and performs measurement and reporting of the neighboring cell RSRP/RSRQ when the trigger type of the measurement configuration is an event (or the trigger type is a period and the measurement purpose is reporting of the strongest cell).
Step S212, the UE reports the signal quality information of the adjacent cell through MeasurementReport.
Step S214, the eNodeB reports the signal quality information, CGI information, and the like of the unknown neighboring cell to the OMC operation and maintenance center for inputting information of the ANR automatic neighboring cell relation processing algorithm policy.
The above two methods have the following problems:
1. in a special case where there is confusion in the physical cell identity PCI, it cannot be guaranteed that the recorded signal quality information (e.g., RSRP/RSRQ) of the unknown cell corresponds to the signal quality information of the CGI obtained by subsequent measurement when the neighboring cell is discovered.
2. In addition to the problems in the method 1, the eNodeB performs additional interaction with the UE to acquire signal quality information (e.g., RSRP/RSRQ) of an unknown cell, thereby increasing air interface overhead.
Disclosure of Invention
The invention mainly aims to provide a method, a device and a system for acquiring signal quality information of an unknown neighbor cell, so as to at least solve the problem that the correctness of the signal quality information of the neighbor cell under a PCI confusion scene cannot be guaranteed.
According to an aspect of the present invention, a method for acquiring signal quality information of an unknown neighboring cell is provided, including: UE receives a measurement task of reporting an unknown neighboring cell CGI issued by an eNodeB; the UE carries out CGI measurement of an unknown neighbor cell according to the measurement task and acquires signal quality information of the unknown neighbor cell; and the UE reports the CGI measurement report to the eNodeB, wherein the CGI measurement report carries the signal quality information of the unknown neighbor cell.
Further, the unknown neighbor cell is a neighbor cell in the LTE system, and the signal quality information at least includes one of the following information: RSRP and RSRQ.
Further, the unknown neighbor cell is a neighbor cell in the inter-system, and the signal quality information at least includes one of the following: RSSI (Received Signal Strength Indication), RSCP (Received Signal code power), EC/No (Energy Chip/Noise, ratio of Chip Energy to total interference Energy density), pilotnphase, pilotStrength Indication.
Further, the user equipment determines the signal quality information to be reported according to the report quantity reporting quantity issued by the eNodeB.
Further, the user equipment determines the signal quality information to be reported according to a measurement result reporting instruction issued by the eNodeB.
Further, under the condition that no measurement result reporting indication exists, the user equipment determines the signal quality information to be reported according to the indication quantity in the quantity distribution sent by the eNodeB.
Further, before the UE receives a measurement task issued by the eNodeB and reporting the CGI of the unknown neighboring cell, the method further includes: and the UE carries out neighbor cell discovery measurement and reports the discovered unknown neighbor cells to the eNodeB.
Further, after the UE reports the CGI measurement result to the eNodeB, the method further includes: and the eNodeB reports the CGI information and the signal quality information of the unknown neighbor cell to the OMC, and the OMC determines whether to add the unknown neighbor cell as the neighbor cell of the service cell according to the ANR neighbor cell addition algorithm strategy and the reporting result.
According to another aspect of the present invention, an apparatus for acquiring signal quality information of an unknown neighboring cell is provided, including: the receiving module is used for receiving a measurement task which is issued by an eNodeB and used for reporting a CGI of an unknown neighboring cell; the CGI measurement module is used for carrying out CGI measurement on an unknown neighboring cell according to the measurement task; the signal quality information acquisition module is used for acquiring the signal quality information of the unknown cell; and a reporting module, configured to report the CGI measurement report to an eNodeB, where the CGI measurement report carries signal quality information of an unknown neighboring cell.
Further, the unknown neighbor cell is a neighbor cell in the LTE system, and the signal quality information at least includes one of the following information: reference signal received power RSRP, reference signal received quality RSRQ.
Further, the unknown neighbor cell is a neighbor cell in the inter-system, and the signal quality information at least includes one of the following: received signal strength indication RSSI, received signal code power RSCP, chip energy to total interference energy density ratio EC/No, pilotnphase, pilotStrength.
According to another aspect of the present invention, there is provided a system for acquiring signal quality information of an unknown neighboring cell, including: UE and eNodeB, wherein UE includes: the receiving module is used for receiving a measurement task which is issued by an eNodeB and used for reporting a CGI of an unknown neighboring cell; the CGI measurement module is used for carrying out CGI measurement on an unknown neighboring cell according to the measurement task; the signal quality information acquisition module is used for acquiring the signal quality information of the unknown cell; and a reporting module, configured to report the CGI detection result to an eNodeB, where the CGI detection result carries signal quality information of an unknown neighboring cell.
According to the invention, when the neighbor cell discovery measurement is carried out, the signal quality information of the unknown neighbor cell is carried while the measurement report of the CGI is reported, so that the correctness of the signal quality information of the unknown neighbor cell in a PCI confusion scene is ensured, and the additional interaction between the UE and the eNodeB can be avoided, thereby reducing the overhead of air interface signaling.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart for acquiring signal quality information when an unknown PCI cell is reported according to the related art;
fig. 2 is a flowchart for acquiring signal quality information using a dedicated air interface process according to the related art;
fig. 3 is a flowchart of a method for acquiring signal quality information according to a first embodiment of the present invention;
fig. 4 is a flowchart of a signal quality information obtaining method according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for acquiring signal quality information according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a system for acquiring signal quality information according to a fifth embodiment of the present invention;
fig. 7 is a flowchart of acquiring signal quality information according to a sixth embodiment of the present invention;
fig. 8 is a flowchart of acquiring signal quality information according to a seventh embodiment of the present invention;
fig. 9 is a flowchart of acquiring signal quality information according to an eighth embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example one
Fig. 3 is a flowchart of a method for acquiring signal quality information according to a first embodiment of the present invention. As shown in fig. 3, the method comprises the following steps:
step S302, UE receives a measurement task of reporting an unknown neighboring CGI, which is issued by an eNodeB.
Step S304, the UE measures the CGI of the unknown neighboring cell and obtains the signal quality information of the unknown cell.
Step S306, the UE reports the CGI measurement report to the eNodeB, where the CGI measurement report carries signal quality information of an unknown neighboring cell.
In the first embodiment, when the measurement report of the CGI is reported, the measurement report carries the signal quality information of the corresponding cell, which not only ensures the correctness of the signal quality information of the neighboring cell in the PCI confusion scenario, but also avoids additional interaction between the UE and the eNodeB, and reduces the overhead of air interface signaling.
The unknown neighbor cell may be a neighbor cell in the LTE system or a neighbor cell in an inter-system. For the neighboring cells in the LTE system, the signal quality information may be RSRP/RSRQ information, and the UE determines which measurement results of the neighboring cells to report according to the reportQuantity, where the measurement results pass through the L3 filter. For the inter-system neighbor cell, the signal quality information may be parameter information such as RSSI, RSCP, EC/No, pilotnphase, pilotStrength, and the like. If the measurement result reporting indication exists, reporting according to the reporting indication; if no measurement report indication exists, reporting can be performed according to the indication quantity in the measurement and distribution, and the measurement result of the different system is also passed through the L3 filter.
Wherein, before step S302, the method includes: the eNodeB configures the UE to perform neighbor cell discovery measurement through the neighbor cell discovery measurement configuration message, and the trigger type of the neighbor cell discovery measurement configuration can be a cycle or an event.
In step S302, the UE detects a neighboring cell according to the measurement configuration, meets the measurement reporting requirement, and reports the found neighboring cell through a neighboring cell discovery measurement report; and the eNodeB acquires the neighbor cell information from the measurement report of the UE, discovers the neighbor cell with the unknown PCI, and configures the UE to carry out CGI measurement of the unknown neighbor cell through the CGI measurement configuration message.
After step S306, the method further includes: the eNodeB acquires CGI information and signal quality information from the measurement report, and reports the found complete information of the neighboring cell to the OMC; and if index information such as the neighbor cell signal quality information reported by the eNodeB reaches a neighbor cell addition algorithm strategy, the OMC automatically configures the corresponding neighbor cell as the neighbor cell of the service cell.
Example two
Fig. 4 is a flowchart of a method for acquiring signal quality information according to a second embodiment of the present invention. As shown in fig. 4, the method comprises the following steps:
step S402, eNodeB initiates RRCConnectionReconfiguration (neighbor discovery measurement configuration) process, and the message configures UE to measure the neighbors on some appointed frequency points;
step S404, the UE receives the RRCConnectionReconfiguration message, and returns an RRCConnectionReconfiguration complete message (neighbor discovery measurement configuration complete) to the eNodeB after completing the local configuration;
step S406, the UE detects the cell on the corresponding frequency point according to the measurement configuration, and reports the cell information meeting the measurement reporting condition to the eNodeB through MeasurementReport (neighbor discovery measurement report);
step S408, after receiving the measurement report reported by the UE, the eNodeB detects whether there is a cell with unknown PCI in the reported neighbor cell record, and if an unknown cell is found, selects an unknown cell, and the eNodeB issues an RRCConnectionReconfiguration (CGI measurement configuration) message to the UE, and configures the CGI information of the cell with unknown PCI detected by the UE.
Step S410, the UE receives the RRCConnectionReconfiguration message, and returns an RRCConnectionReconfiguration complete (CGI measurement configuration complete) message to the eNodeB after completing the local configuration;
step S412, the UE detects the CGI information of the cell of the designated PCI according to the measurement configuration, reports the CGI information of the cell to the eNodeB through a MeasurementReport (CGI measurement report) after acquiring the PCI information of the unknown cell, and reports the signal quality information of the cell to the eNodeB;
step S414, the eNodeB reports CGI information, signal quality information, and the like of the neighboring cell found by the UE to the OMC, and after the OMC obtains the information of the found neighboring cell, the OMC detects whether indexes such as the signal quality information of the cell satisfy a neighboring cell addition condition according to an ANR neighboring cell addition algorithm policy, and if the conditions are met, adds the cell as a neighboring cell of the serving cell.
In the second embodiment, when the CGI measurement report of the unknown neighboring cell is reported, the CGI measurement report of the unknown neighboring cell is carried with the signal quality information of the neighboring cell, so that the correctness of the signal quality information of the neighboring cell in a PCI confusion scenario is ensured, additional interaction between the UE and the eNodeB can be avoided, and overhead of an air interface signaling is reduced.
EXAMPLE III
Fig. 5 is a schematic structural diagram of an apparatus for acquiring signal quality information according to a third embodiment of the present invention. As shown in fig. 5, the apparatus includes: the system comprises a receiving module 101, a CGI measuring module 102, a signal quality information obtaining module 106 and a reporting module 103. Wherein,
a receiving module 101, configured to receive a measurement task issued by an eNodeB and reporting a CGI of an unknown neighboring cell; a CGI measurement module 102, configured to measure a CGI of an unknown neighboring cell; the signal quality information obtaining module 106 is configured to obtain signal quality information of an unknown neighboring cell; a reporting module 103, configured to report the CGI measurement report to the eNodeB, where the CGI measurement report carries signal quality information of an unknown neighboring cell.
In the third embodiment, when the reporting module 103 reports the CGI measurement report of the unknown neighboring cell, the CGI measurement report of the unknown neighboring cell is carried with the signal quality information of the neighboring cell, which not only ensures the correctness of the signal quality information of the neighboring cell in a PCI confusion scenario, but also avoids additional interaction between the UE and the eNodeB, thereby reducing the overhead of air interface signaling.
Example four
In addition to the functional modules in the third embodiment, in this embodiment, the unknown neighboring cell may be an intra-LTE system neighboring cell or an inter-system neighboring cell. When the unknown neighboring cell is a neighboring cell in the LTE system, the reported signal quality information may include: reference signal received power RSRP, reference signal received quality RSRQ. When the unknown adjacent cell is the inter-system adjacent cell, the reported signal quality information at least comprises one of the following information: received signal strength indication RSSI, received signal code power RSCP, chip energy to total interference energy density ratio EC/No, pilotnphase, pilotStrength.
EXAMPLE five
Fig. 6 is a schematic structural diagram of a system for acquiring signal quality information according to a fifth embodiment of the present invention. As shown in fig. 6, the system includes: user equipment 100 and eNodeB 200.
Wherein, the user equipment 100 comprises: a receiving module 101, configured to receive a measurement task issued by an eNodeB and reporting a CGI of an unknown neighboring cell; a CGI measurement module 102, configured to measure a CGI of an unknown neighboring cell; the signal quality information obtaining module 106 is configured to obtain signal quality information of an unknown neighboring cell; a reporting module 103, configured to report the CGI measurement report to the eNodeB, where the CGI measurement report carries signal quality information of an unknown neighboring cell.
EXAMPLE six
Fig. 7 is a flowchart of acquiring signal quality information according to a sixth embodiment of the present invention. The embodiment is applicable to the case of inter-system GERAN. As shown in fig. 8, the method comprises the following steps:
step 702, the eNodeB configures the UE to perform inter-system GERAN neighbor discovery measurement.
Step 704, the UE performs signal quality measurement of the unknown neighboring cell of the inter-system GERAN according to the obtained inter-system measurement configuration, and obtains a signal quality measurement result of the unknown neighboring cell of the GERAN.
Step 706, the UE reports the obtained signal quality measurement result of the unknown GERAN neighbor cell to the eNodeB, and the eNodeB decides whether to add the unknown neighbor cell as the neighbor cell of the serving cell according to the measurement result reported by the UE and a predetermined algorithm.
EXAMPLE seven
Fig. 8 is a flowchart of acquiring signal quality information according to a seventh embodiment of the present invention. The embodiment is applicable to the case of inter-system GERAN. As shown in fig. 8, the method comprises the following steps:
step 802, the eNodeB configures the UE to perform inter-system UTRAN neighbor discovery measurement.
Step 804, the UE performs inter-system UTRAN cell measurement according to the acquired inter-system measurement configuration, and acquires a measurement result of the UTRAN cell.
Step 806, the UE reports the measurement result of the acquired UTRAN cell to the eNodeB, and the eNodeB decides whether to add an unknown neighbor cell as the neighbor cell of the serving cell according to the cell measurement result reported by the UE and a predetermined algorithm.
Example eight
Fig. 9 is a flowchart of acquiring signal quality information according to an eighth embodiment of the present invention. The invention is suitable for the case of different system CDMA. As shown in fig. 9, the method comprises the following steps:
step 902, the eNodeB configures the UE to perform inter-system CDMA neighbor discovery measurement.
Through the embodiment of the invention, when the measurement report of the CGI is reported, the signal quality information of the corresponding cell is carried, so that the correctness of the signal quality information of the neighboring cell in a PCI confusion scene is ensured, and the additional interaction between the UE and the eNodeB can be avoided, thereby reducing the overhead of air interface signaling.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for acquiring signal quality information of an unknown neighboring cell is characterized by comprising the following steps:
UE receives a measurement task of reporting an unknown neighboring cell CGI issued by an eNodeB;
the UE carries out CGI measurement of the unknown neighbor cell according to the measurement task and acquires signal quality information of the unknown neighbor cell;
and the UE reports a CGI measurement report to the eNodeB, wherein the CGI measurement report carries the signal quality information of the unknown neighboring cell.
2. The method of claim 1, wherein the unknown neighbor cell is an intra-LTE neighbor cell, and wherein the signal quality information comprises at least one of:
reference signal received power RSRP, reference signal received quality RSRQ.
3. The method of claim 1, wherein the unknown neighbor cell is an inter-system neighbor cell, and wherein the signal quality information comprises at least one of:
received signal strength indication RSSI, received signal code power RSCP, chip energy to total interference energy density ratio EC/No, pilotpnp phase, pilot signal strength pilotStrength.
4. The method of claim 2, wherein the UE determines the signal quality information to be reported according to a report quantity reporting quantity issued by an eNodeB.
5. The method of claim 3, wherein the UE determines the signal quality information to be reported according to a measurement result reporting indicator sent by an eNodeB.
6. The method of claim 5, wherein the UE determines the signal quality information to be reported according to an indicated quantity in a quantity distribution sent by an eNodeB, in the absence of the measurement result reporting indication.
7. The method according to any one of claims 1 to 6, wherein before the UE receives a measurement task issued by an eNodeB and reporting the CGI of the unknown neighboring cell, the method further comprises:
and the UE carries out neighbor cell discovery measurement and reports the discovered unknown neighbor cells to the eNodeB.
8. The method of claim 1, wherein after the UE reports the CGI measurement report to the eNodeB, further comprising:
and the eNodeB reports the CGI information and the signal quality information of the unknown neighbor cell to the OMC, and the OMC determines whether to add the unknown neighbor cell as the neighbor cell of the serving cell according to an ANR neighbor cell addition algorithm strategy and a reporting result.
9. An apparatus for acquiring signal quality information of an unknown neighboring cell, comprising:
the receiving module is used for receiving a measurement task which is issued by an eNodeB and used for reporting a CGI of an unknown neighboring cell;
a CGI measurement module, configured to perform CGI measurement of the unknown neighboring cell according to the measurement task;
a signal quality information obtaining module, configured to obtain signal quality information of the unknown neighboring cell;
and a reporting module, configured to report a CGI measurement report to the eNodeB, where the CGI measurement report carries the signal quality information of the unknown neighboring cell.
10. The apparatus of claim 9, wherein the unknown neighbor cell is an intra-LTE neighbor cell, and wherein the signal quality information comprises at least one of:
reference signal received power RSRP, reference signal received quality RSRQ.
11. The apparatus of claim 9, wherein the unknown neighbor is an inter-system neighbor, and wherein the signal quality information comprises at least one of:
received signal strength indication RSSI, received signal code power RSCP, chip energy to total interference energy density ratio EC/No, pilotnphase, pilotStrength.
12. A system for acquiring signal quality information of an unknown neighboring cell is characterized by comprising: a UE and an eNodeB, wherein the UE comprises:
the UE receives a measurement task which is issued by the eNodeB and used for reporting the CGI of the unknown neighboring cell;
a CGI measurement module, configured to perform CGI measurement of the unknown neighboring cell according to the measurement task;
a signal quality information obtaining module, configured to obtain signal quality information of the unknown neighboring cell;
and a reporting module, configured to report a CGI detection result to the eNodeB, where the CGI detection result carries the signal quality information of the unknown neighboring cell.
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| CN2011100839732A CN102740347A (en) | 2011-04-02 | 2011-04-02 | Method, apparatus and system for acquiring signal quality information of unknown neighbor |
| PCT/CN2011/078935 WO2012136041A1 (en) | 2011-04-02 | 2011-08-25 | Method, device and system for acquiring signal quality information of unknown neighbor cell |
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| 3GPP ORGANIZATIONAL PARTNERS: "3GPP TS 36.331 V10.1.0", 《3GPP》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106304140A (en) * | 2015-06-10 | 2017-01-04 | 中兴通讯股份有限公司 | The method of cutting off rate, device and base station is reduced during performing ANR |
| CN106304140B (en) * | 2015-06-10 | 2021-07-16 | 中兴通讯股份有限公司 | Method, device and base station for reducing call drop rate in execution of ANR (automatic neighbor relation) |
| WO2016184184A1 (en) * | 2015-10-12 | 2016-11-24 | 中兴通讯股份有限公司 | Method and apparatus for acquiring neighbor cell frequency band information, mobility management method and apparatus, and storage medium |
| CN110876161A (en) * | 2018-08-31 | 2020-03-10 | 中兴通讯股份有限公司 | Cell discovery method, device and computer readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012136041A1 (en) | 2012-10-11 |
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