CN1874591A - Implementaion method for selecting applicable wireless access techniques - Google Patents
Implementaion method for selecting applicable wireless access techniques Download PDFInfo
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- CN1874591A CN1874591A CNA2005100723340A CN200510072334A CN1874591A CN 1874591 A CN1874591 A CN 1874591A CN A2005100723340 A CNA2005100723340 A CN A2005100723340A CN 200510072334 A CN200510072334 A CN 200510072334A CN 1874591 A CN1874591 A CN 1874591A
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Abstract
The method comprises: in the ID information corresponding to each PLMN in the PLMN selection list, setting the indication information used for indicating each radio access approach in order to make a radio terminal capable of fast and accurately selecting the corresponding radio access approach in term of the indication message so as to improve the efficiency of selecting radio terminal.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of implementation method of selecting the employing wireless access technology.
Background technology
Regulation according to 3GPP 23.122, under automatic PLMN (public land mobile net network) preference pattern, terminal should be searched for PLMN according to the order of HPLMN (local PLMN) tabulation in RPLMN (PLMN of registration), USIM (3G subscription identification module) card, UPLMN (user PLMN) tabulation, OPLMN (PLMN of operator) tabulation in start, when the no area of coverage recovers.Terminal need periodically be searched in HPLMN tabulation, UPLMN tabulation, the OPLMN tabulation than current VPLMN (visit PLMN) PLMN that priority is higher when roaming state.From usim card, read these PLMN tabulations, the RAT (wireless access technology) that list items comprises PLMN number and this PLMN uses by the Cu interface during starting up of terminal.
In the 3GPP standard, there are WCDMA (Wideband Code Division Multiple Access (WCDMA)), TD-SCDMA several wireless access technologys such as (Time Division-Synchronous Code Division Multiple Access), therefore in the network operation of reality, the PLMN of different operators may support different wireless access technologys, also may have different radio access technologies simultaneously among the PLMN of same operator.
Operator may allow the user preferably select the network of certain access technology according to the actual needs of networking and operation.In addition because the overlay area is different or for other considerations, as solving the telephone traffic peak, may sign roaming agreement permission user between the operator at internetwork roaming.Therefore, each operator usually can in the HPLMN of the usim card of its distribution and OPLMN tabulation, write Home Network PLMN number and and the various wireless access technologys supported, and PLMN number and the wireless access technology of supporting allowing the network of user's roaming.Simultaneously, also, different network and wireless access technologys in tabulating carried out prioritization according to strategy of Home Network operation (as the access technology of preferential use etc.) and roaming agreement (as the roaming network of preferential use, the preferential access technology of using etc.).
For example: the PLMN46007 main management WCDMA network of first operator, and the additional TD-SCDMA network coverage in the city, the PLMN46008 main management TD-SCDMA network of second operator, and the additional WCDMA network coverage in the city, the PLMN46009 operation TD-SCDMA network of third operator.
Sign roaming agreement between first, second, the third three operators, wish user's preferential main management network that uses oneself in Home Network between first and second, the preferential complementary network that uses the other side during roaming third preferentially when wishing user's (user may use multimode terminal) roaming uses first and second TD-SCDMA network, secondly is first and second WCDMA network.
Based on above-mentioned hypothesis, then three operators are as shown in table 1 with the PLMN priority that writes in the usim card of distribution separately:
Table 1, exist in the usim card selective listing different radio access technologies priority for example
。
| The list items order | The PLMN priority of first operator | The PLMN of second operator priority | The PLMN priority of third operator | |||
| The HPLMN tabulation | The OPLMN tabulation | The HPLMN tabulation | The OPLMN tabulation | The HPLMN tabulation | The OPLMN tabulation | |
| 1 | 460 07 WCDMA | 460 08 WCDMA | 460 08 TD-SCDMA | 460 07 TD-SCDMA | 460 09 TD-SCDMA | 460 07 TD-SCDMA |
| 2 | 460 07 TD-SCDMA | 460 08 TD-SCDMA | 460 08 WCDMA | 460 09 TD-SCDMA | 460 08 TD-SCDMA | |
| 3 | 460 09 TD-SCDMA | 460 07 WCDMA | 460 07 WCDMA | |||
| 4 | 460 08 WCDMA | |||||
In addition, the user also can be according to used terminal type, the experience of own service quality to different wireless access technologys and the policy factors such as (as rate) of operator, different networks and wireless access technology are carried out prioritization, and be kept in the UPLMN tabulation of usim card.
In each version of existing 3GPP standard TS 31.102, comprise the wireless access technology indication information in HPLMN tabulation, UPLMN tabulation and the OPLMN tabulation, be used to the wireless access technology of representing that this PLMN can support.As shown in Figure 1, only adopted the bit8 of first byte in the wireless access technology indication of in above-mentioned standard, stipulating, be used to identify corresponding PLMN and whether support UTRAN (Universal Terrestrial Radio Access Network network).
In Fig. 1, B1, B2 ..., B8 represent this byte the 1st, 2 ..., 8 Bit.
When the Bit8 value is 1 in described first byte, represent that this PLMN has adopted the UTRAN wireless access technology;
When the Bit8 value is 0 in described first byte, represent that this PLMN does not adopt the UTRAN wireless access technology;
Other each Bit position is RFU (keeps to give in the future and use).
At present, described wireless access technology comprises: TDD LCR (Time Division DuplexLow Chip Rate, low chip time division duplex), TDD HCR (Time Division Duplex HighChip Rate, high chip time division duplex) and FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)).But, above-mentioned prior art only identifies corresponding PLMN and whether supports UTRAN, and do not refine in three wireless access technologys that concrete support UTRAN comprises which, and promptly specifically be FDD (WCDMA FDD), TDD LCR (TD-SCDMA) is TDD HCR (WCDMATDD) still.Therefore, in concrete application process, will cause occurring following problem:
(1) operator can't define the FDD of PLMN, the different use priority of TDD LCR and TDD HCR according to the needs of network operations such as networking or roaming agreement;
(2) mobile subscriber can not define the FDD of non-HPLMN, the different use priority of TDD LCR and TDD HCR according to the own factors such as preference that the service of rate or network is experienced;
(3) in use, three mould terminals will all be searched for one time three kinds of wireless access technologys, cause the PLMN of terminal to prolong search time;
(4) must repeat repeatedly to carry out unnecessary periodicity PLMN search for the terminal of only supporting a pattern;
(5) wireless system reduces (terminal can not be monitored beep-page message in the PLMN search procedure) to the paging success rate index of this terminal, and can influence the stand-by time of terminal.
Now the problem that will exist prior art in conjunction with several concrete examples is again done further to analyze:
(1) for TD-SCDMA and WCDMA FDD dual-mode terminal, the wireless access technology that cause can't obtain the actual support of this PLMN is WCDMA or TD-SCDMA, terminal can not directly select for use corresponding wireless access technology to search for this network according to the access technology of the actual support of network in the very first time, can only adopt WCDMA and TD-SCDMA access technology to search for FDD and TDD frequency range respectively successively according to the self-defining sequencing of terminal.
If the wireless access technology of the wireless access technology that terminal is at first selected for use and the actual support of this PLMN different (examples: the actual employing of network WCDMA FDD technology, terminal be search TD-SCDMA earlier), the search procedure of TDD frequency range must be failed.Then can only after search TDD and these two frequency ranges of FDD, just can find this PLMN.This PLMN search failure could be found after perhaps having searched for these two frequency ranges, the PLMN of time high priority could be begun to select.
Search for the TDD frequency range in above-mentioned existing scheme must be to come to nothing, and therefore, this is the process of a meaningless power consumption consuming time, but inevitable, must all can take place at every turn.
(2) for the WCDMA single-mode terminal, if the wireless access technology of the actual support of this PLMN is TD-SCDMA, terminal is because of obtaining this information, can think that this PLMN is the PLMN that adopts the WCDMA wireless access technology, so with the WCDMA wireless access technology at this PLMN of FDD frequency band search, after the intact FDD full frequency band of terminal searching is found this PLMN search failure, just can remove to attempt selecting the PLMN of time high priority.
Equally, the search for the FDD frequency range in this scheme must be to come to nothing, and makes the same processing procedure that has a unavoidable meaningless power consumption consuming time in this scheme.
(3) for the TD-SCDMA single-mode terminal, if the wireless access technology of the actual support of this PLMN is WCDMA, terminal is because of obtaining this information, can think that this PLMN is the PLMN that adopts the TD-SCDMA wireless access technology, so with the TD-SCDMA wireless access technology at this PLMN of TDD frequency band search, after the intact TDD full frequency band of terminal searching is found this PLMN search failure, just can remove to attempt selecting the PLMN of time high priority.
Search for the FDD frequency range in this scheme must be to come to nothing, and makes the processing procedure that also has an inevitable meaningless power consumption consuming time in this scheme.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of implementation method of selecting the employing wireless access technology, thereby make wireless terminal device can select to use corresponding wireless access technology to carry out access attempts effectively, to improve the efficient that PLMN selects processing procedure, can also facilitate for the use priority that operator and user are provided with various wireless access technologys simultaneously.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of implementation method of selecting the employing wireless access technology, comprising:
A, the concrete wireless access technology information that this PLMN of indication adopts in each public land mobile net network PLMN information;
The concrete wireless access technology that B, portable terminal select terminal to adopt according to the indication information among described each PLMN;
C, wireless access technology access network by selecting.
Described steps A comprises:
The wireless access technology information that this PLMN of indication adopts in each PLMN information in the PLMN selective listing in each portable terminal or 3G subscription identification module usim card.
Described wireless access technology comprises:
FDD, low chip TDD LCR and high chip TDD HCR.
Described steps A comprises:
The wireless access technology information that first byte in each PLMN information in the PLMN selective listing of A1, employing usim card indicates this PLMN to adopt.
Described steps A 1 comprises:
Adopt the different different wireless access technology of bit indication in first byte in each PLMN information, corresponding position is labeled as 1 or 0, the wireless access technology that is used to represent this PLMN employing or adopts the representative of corresponding position.
Described steps A 1 comprises:
The wireless access technology that adopts this PLMN of at least one bit representation in first byte in each PLMN information to adopt.
Described steps A 1 also comprises:
Adopt this PLMN of indication in first byte in each PLMN information whether to adopt Universal Terrestrial Radio Access Network network UTRAN wireless access technology.
Described step B comprises:
B1, portable terminal determine according to the indication information among the PLMN whether this PLMN has adopted the UTRAN wireless access technology, if, execution in step B2 then, otherwise process finishes;
B2, continuation are analyzed the PLMN indication information and are determined operable wireless access technology information, and execution in step C.
The present invention also provides a kind of usim card, comprising:
The wireless access information storage module of PLMN: be used to preserve the information of the concrete wireless access technology of indicating each PLMN employing, and provide calling interface.
The present invention also provides a kind of portable terminal, comprising:
The wireless access information storage module of PLMN: be used to preserve the information of the concrete wireless access technology of indicating each PLMN employing, and offer wireless access technology selection module;
Wireless access technology is selected module: the concrete wireless access technology that the indication information among each PLMN that is used for preserving according to the wireless access information storage module of described PLMN selects terminal to adopt.
As seen from the above technical solution provided by the invention, adopt the present invention, system can clearly provide the concrete wireless access technology used can selected, improved PLMN selection course efficient, thereby avoided some non-essential wireless access search procedures;
Realization of the present invention makes that also operator can be according to the needs definition HPLMN of real networks such as network construction or roaming agreement operation and the FDD of non-HPLMN, the different use priority of TDD LCR and TDD HCR.Require the preferential wireless access technology that adopts of terminal thereby can be provided with;
Simultaneously, realization of the present invention also makes the mobile subscriber can be according to the FDD that takes all factors into consideration the non-HPLMN of definition of own factors such as service impression to rate or network, the use priority of TDD LCR and three kinds of access technologies of TDD HCR.
Be not difficult to find out, of the present invention realize on the one hand can be so that the PLMN of terminal shortens search time greatly, can also make terminal and operator that the priority that terminal can be selected the wireless access technology used can be set more neatly on the other hand, be convenient to operation management, and can satisfy user's individual sexual demand.
Description of drawings
Fig. 1 is the schematic diagram of first byte of PLMN list item in the prior art;
Fig. 2 is the schematic diagram 1 of first byte of PLMN list item among the present invention;
Fig. 3 is the schematic diagram 2 of first byte of PLMN list item among the present invention;
Fig. 4 is the schematic diagram 3 of first byte of PLMN list item among the present invention;
Fig. 5 is the schematic diagram 4 of first byte of PLMN list item among the present invention.
Embodiment
Core of the present invention is the indication that each concrete wireless access technology is set in the identifying information of each PLMN correspondence in the PLMN selective listing that wireless terminal is used, thereby make wireless terminal when the wireless access technology of selecting access network to use, can choose corresponding wireless access technology accurately and quickly, improve the efficient of wireless terminal selection PLMN.
The present invention can select some PLMN the indication information of each wireless access technology of using to be arranged at optional position in this PLMN list item in the specific implementation process.
In actual applications, consider present regulation according to 3GPP standard TS 31.102, be to adopt first byte representation wireless access indication information in the PLMN list item, therefore, the present invention will be that example describes specific implementation of the present invention with the corresponding Bit that revises in this first byte.
Among the present invention, specifically can utilize the modification of first byte to be implemented in and further clearly go out the wireless access technology that concrete this PLMN can select in the system, thereby effectively avoid the various problems that occurs of causing owing to wireless access technology is indeterminate described in the prior.
Based on existing 3GPP standard TS 31.102, the present invention revises first byte in the wireless access technology indication that has defined HPLMN tabulation, UPLMN tabulation and OPLMN tabulation etc.Used follow-up three BIT in this byte, as Fig. 2, wherein:
The Bit8 value can be 1 or 0 in first byte, when value is 1, represents that this PLMN has adopted the FDD of UTRAN wireless access technology; When value is 0, represent that this PLMN does not adopt the FDD of UTRAN wireless access technology;
The Bit7 value can be 1 or 0 equally in first byte, when value is 1, represents that this PLMN has adopted the TDD LCR of UTRAN wireless access technology; When value is 0, represent that this PLMN does not adopt the TDD LCR of UTRAN wireless access technology;
The Bit6 value can be 1 or 0 in first byte, when value is 1, represents that this PLMN has adopted the TDD HCR of UTRAN wireless access technology; When value is 0, represent that this PLMN does not adopt the TDD HCR of UTRAN wireless access technology.
Certainly, the order of these three kinds of wireless access technology RAT can exchange arbitrarily according to actual needs.
If follow-up UTRAN introduces new wireless access technology, also can expand according to this method.And same, each wireless access technology order still also can be exchanged, and the indicating bit order of each wireless access technology promptly can be set arbitrarily, in Fig. 2, can also perhaps indicate the TDD access technology with B7 with B5 or B6 indication FDD access technology, or the like.
The present invention for some special applied environment, as only supporting the wherein applied environment of two kinds of access technologies, for example only supports FDD and TDD LCR in implementation procedure, then described first byte can be done expansion as shown in Figure 3, wherein:
The Bit8 value can be 1 or 0 in first byte, when value is 1, represents that this PLMN has adopted the FDD of UTRAN wireless access technology; When value is 0, represent that this PLMN does not adopt the FDD of UTRAN wireless access technology;
The Bit7 value can be 1 or 0 equally in first byte, when value is 1, represents that this PLMN has adopted the TDD LCR of UTRAN wireless access technology; When value is 0, represent that this PLMN does not adopt the TDD LCR of UTRAN wireless access technology;
Equally, the indication of each wireless access technology order can be exchanged.
Among the present invention,, can also adopt mode as shown in Figure 4 and Figure 5 to revise first byte in the wireless access technology indication that defines HPLMN tabulation, UPLMN tabulation and OPLMN tabulation etc. based on the regulation of existing 3GPP standard TS 31.102.
At first as shown in Figure 4, wherein:
The Bit8 value is 1 o'clock in first byte, represents that this PLMN has adopted the UTRAN wireless access technology, and at this moment, follow-up three adjacent Bit then can be defined as respectively:
The Bit7 value is 1 o'clock in first byte, represents that this PLMN has adopted the FDD of UTRAN wireless access technology; The Bit7 value is 0 o'clock in first byte, represents that this PLMN does not adopt the FDD of UTRAN wireless access technology;
The Bit6 value is 1 o'clock in first byte, represents that this PLMN has adopted the TDD LCR of UTRAN wireless access technology; The Bit6 value is 0 o'clock in first byte, represents that this PLMN does not adopt the TDD LCR of UTRAN wireless access technology;
The Bit5 value is 1 o'clock in first byte, represents that this PLMN has adopted the TDD HCR of UTRAN wireless access technology; The Bit5 value is 0 o'clock in first byte, represents that this PLMN does not adopt the TDD HCR of UTRAN wireless access technology;
When the Bit8 value is 0 in first byte, represent that this PLMN does not adopt the UTRAN wireless access technology; At this moment, follow-up three Bit need not it is carried out dissection process at this moment without any meaning.
Equally, the order of various wireless access technology RAT can exchange arbitrarily.Introduce new wireless access technology for follow-up UTRAN, can expand according to method provided by the invention.
The present invention is for some special applied environments, when for example only supporting two kinds of access technologies wherein, and for example FDD and TDD LCR.Then first byte can be done expansion as shown in Figure 5, wherein:
The Bit8 value is 1 o'clock in first byte, represents that this PLMN has adopted the UTRAN wireless access technology, and at this moment, follow-up three adjacent Bit then can be defined as respectively:
The Bit7 value is 1 o'clock in first byte, represents that this PLMN has adopted the FDD of UTRAN wireless access technology; The Bit7 value is 0 o'clock in first byte, represents that this PLMN does not adopt the FDD of UTRAN wireless access technology;
The Bit6 value is 1 o'clock in first byte, represents that this PLMN has adopted the TDD LCR of UTRAN wireless access technology; The Bit6 value is 0 o'clock in first byte, represents that this PLMN does not adopt the TDD LCR of UTRAN wireless access technology;
When the Bit8 value is 0 in first byte, represent that this PLMN does not adopt the UTRAN wireless access technology; At this moment, follow-up three Bit need not it is carried out dissection process at this moment without any meaning.
When adopting Fig. 4 or first byte shown in Figure 5 to carry out the indication of the concrete wireless access technology information that PLMN adopts in the usim card, when portable terminal is selected to use corresponding PLMN, at first judge according to the value of the Bit8 in the indication information of this PLMN whether this PLMN has adopted the UTRAN wireless access technology, if, thereby then continue to analyze other follow-up definite concrete wireless access technology information that adopt, otherwise, finish at this selection processing procedure of wireless access technology of this PLMN.
The present invention also provides a kind of usim card, as shown in Figure 6, comprising:
The wireless access information storage module of PLMN: the information that is used to preserve the concrete wireless access technology of indicating each PLMN employing, and provide calling interface, promptly in described usim card, preserve the corresponding PLMN tabulation that method of the present invention provides, the particular content front is described in the list item, no longer describes in detail herein.
The present invention also provides a kind of portable terminal, as Fig. 7, comprising:
The wireless access information storage module of PLMN: be used to preserve the information of the concrete wireless access technology of indicating each PLMN employing, and offer wireless access technology selection module;
Wireless access technology is selected module: the concrete wireless access technology that the indication information among each PLMN that is used for preserving according to the wireless access information storage module of described PLMN selects terminal to adopt.
In sum, the present invention can clearly provide concrete wireless access technology, has improved PLMN selection course efficient, has effectively avoided the unnecessary PLMN search procedure of terminal, makes the PLMN of terminal shorten greatly search time.
And, operator and mobile subscriber all can be provided with definition as required can select the FDD that uses in the corresponding PLMN list item, the different priority of TDD LCR and TDD HCR specifically is by adjusting the ordinal position of each list item relation realization in the table 1 in the prior art.That is to say that realization of the present invention makes and can consider the concrete wireless access technology that each PLMN can support when table 1 is set, be its definition corresponding order position.
Do further to analyze explanation below in conjunction with effective effect that several concrete application examples can bring in concrete application process the present invention,, still describe with reference to several examples of application of the prior art for making contrast obviously.
(1), can dispose the corresponding PLMN tabulation of definition according to real network for TD-SCDMA/WCDMA FDD dual-mode terminal.If network has only adopted TD-SCDMA, in this PLMN list item, only list TD-SCDMA.Then terminal can directly adopt corresponding TD-SCDMA access technology to search for according to the wireless access indication information in the list item, promptly only needs search TDD frequency range, just can find PLMN, perhaps finds PLMN search failure.Thereby avoided search procedure, effectively shortened the needed time of search PLMN WCDMA FDD.
(2) for the WCDMA single-mode terminal, according to the present invention, in usim card, can be the clear and definite RAT information of providing of PLMN, like this, terminal can be ignored all TD-SCDMA PLMN items in the tabulation, and the search terminal PLMN that can support only.For the TD-SCDMA network, needn't carry out any search procedure.
(3) for the TD-SCDMA single-mode terminal, if the clear and definite RAT information of providing of PLMN can be provided USIM, then terminal can be ignored all WCDMA PLMN items in the tabulation, the PLMN that a search terminal can be supported.For the WCDMA network, needn't carry out any search procedure.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of implementation method of selecting the employing wireless access technology is characterized in that, comprising:
A, the concrete wireless access technology information that this PLMN of indication adopts in each public land mobile net network PLMN information;
The concrete wireless access technology that B, portable terminal select terminal to adopt according to the indication information among described each PLMN;
C, wireless access technology access network by selecting.
2, the implementation method of selection employing wireless access technology according to claim 1 is characterized in that, described steps A comprises:
The wireless access technology information that this PLMN of indication adopts in each PLMN information in the PLMN selective listing in each portable terminal or 3G subscription identification module usim card.
3, the implementation method of selection employing wireless access technology according to claim 1 is characterized in that, described wireless access technology comprises:
FDD, low chip TDD LCR and high chip TDD HCR.
4, according to the implementation method of claim 1,2 or 3 described selection employing wireless access technologies, it is characterized in that described steps A comprises:
The wireless access technology information that first byte in each PLMN information in the PLMN selective listing of A1, employing usim card indicates this PLMN to adopt.
5, the implementation method of selection employing wireless access technology according to claim 4 is characterized in that, described steps A 1 comprises:
Adopt the different different wireless access technology of bit indication in first byte in each PLMN information, corresponding position is labeled as 1 or 0, the wireless access technology that is used to represent this PLMN employing or adopts the representative of corresponding position.
6, the implementation method of selection employing wireless access technology according to claim 4 is characterized in that, described steps A 1 comprises:
The wireless access technology that adopts this PLMN of at least one bit representation in first byte in each PLMN information to adopt.
7, the implementation method of selection employing wireless access technology according to claim 4 is characterized in that, described steps A 1 also comprises:
Adopt this PLMN of indication in first byte in each PLMN information whether to adopt Universal Terrestrial Radio Access Network network UTRAN wireless access technology.
8, the implementation method of selection employing wireless access technology according to claim 7 is characterized in that, described step B comprises:
B1, portable terminal determine according to the indication information among the PLMN whether this PLMN has adopted the UTRAN wireless access technology, if, execution in step B2 then, otherwise process finishes;
B2, continuation are analyzed the PLMN indication information and are determined operable wireless access technology information, and execution in step C.
9, a kind of usim card is characterized in that, comprising:
The wireless access information storage module of PLMN: be used to preserve the information of the concrete wireless access technology of indicating each PLMN employing, and provide calling interface.
10, a kind of portable terminal is characterized in that, comprising:
The wireless access information storage module of PLMN: be used to preserve the information of the concrete wireless access technology of indicating each PLMN employing, and offer wireless access technology selection module;
Wireless access technology is selected module: the concrete wireless access technology that the indication information among each PLMN that is used for preserving according to the wireless access information storage module of described PLMN selects terminal to adopt.
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| WO2009149600A1 (en) * | 2008-06-13 | 2009-12-17 | Huawei Technologies Co., Ltd. | Method of load balancing in a mobile communications system |
| CN101282519B (en) * | 2007-04-03 | 2010-12-22 | 展讯通信（上海）有限公司 | Method for updating PLMN list needed to cipher IMSI in smart card apparatus |
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| CN102687564A (en) * | 2010-09-29 | 2012-09-19 | 华为技术有限公司 | Method, apparatus and system for selecting target radio access technology |
| CN102300288A (en) * | 2011-08-19 | 2011-12-28 | 中兴通讯股份有限公司 | System indicating method and device as well as network selecting method and device and communication system |
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