CN107548122A - A kind of multimode terminal start method for searching network and device - Google Patents

A kind of multimode terminal start method for searching network and device Download PDF

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Publication number
CN107548122A
CN107548122A CN201610488416.1A CN201610488416A CN107548122A CN 107548122 A CN107548122 A CN 107548122A CN 201610488416 A CN201610488416 A CN 201610488416A CN 107548122 A CN107548122 A CN 107548122A
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plmn
frequency range
searched
searching
multimode terminal
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CN107548122B (en
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李星
魏贵明
徐菲
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China Academy of Information and Communications Technology CAICT
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China Academy of Telecommunications Research CATR
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Abstract

The invention provides a kind of multimode terminal start method for searching network and multimode terminal, this method to include：Optimal available PLMN is searched on the RAT of multimode terminal known network and frequency range, if search optimal available PLMN, multimode terminal is then accessed into the optimal available PLMN, otherwise, optimal available PLMN is searched in not searching in frequency range for preferred RAT and preferred RAT, if searching optimal available PLMN, multimode terminal is accessed into the optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.The present invention can effectively shorten searches the net time under international roaming state.

Description

A kind of multimode terminal start method for searching network and device
Technical field
The present invention relates to communication technical field, more particularly to a kind of multimode terminal start method for searching network and device.
Background technology
Planned according to the wireless frequency spectrum of world community, sharing 43 frequency ranges at present may be used for disposing LTE network.In order to just In global roaming, some mobile phones and terminal chip manufacturer propose that the whole network is logical, global frequency range mobile phone concept, make terminal and corresponding Terminal communication chip needs to support more multi-radio access technology (sharing 6 kinds of wireless access technologys at present) and more movements as far as possible The frequency range of communication system.
LTE multimode terminals and 3GPP the and 3GPP2 standards of corresponding terminal communication chip research and development institute reference be not clear and definite Define how multimode terminal should search net, simply require that the communication chip of terminal should be according to terminal and SIM/USIM/ISIM cards In network priority carry out network selection, but specifically search how net flow is needed by terminal communication chip R ＆ D Enterprises Voluntarily realize.In face of up to 43 frequency ranges and 6 kinds of wireless access technologys, take long enough if all searched for, user Experience can be very bad, and therefore, the start for how improving LTE multimode terminals searches net spee and turns into a urgent problem to be solved.
The content of the invention
In view of this, can be effective it is an object of the invention to provide a kind of multimode terminal start method for searching network and device Shorten and search the net time under international roaming state.
In order to achieve the above object, the invention provides following technical scheme：
A kind of multimode terminal start method for searching network, including：
Optimal available PLMN is searched on the RAT of multimode terminal known network and frequency range, if searched optimal available PLMN, then multimode terminal is accessed into the optimal available PLMN, otherwise,
Optimal available PLMN is searched in not searching in frequency range for preferred RAT and preferred RAT, if searched optimal available PLMN, then multimode terminal is accessed into the optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.
A kind of multimode terminal, including：First search unit, the second search unit；
First search unit, for searching for optimal available PLMN on the RAT of multimode terminal known network and frequency range, If searching optimal available PLMN, multimode terminal is accessed into the optimal available PLMN；
Second search unit, in the case of not searching optimal available PLMN for the first search unit, preferred Optimal available PLMN is searched in not searching in frequency range for RAT and preferred RAT, if optimal available PLMN is searched, by multimode terminal The optimal available PLMN is accessed, otherwise, it determines multimode terminal is currently without network service.
As can be seen from the above technical solution, in the present invention, the network process of searching when multimode terminal is started shooting is divided into two stages, Search net in the first stage to carry out on the RAT of multimode terminal known network and frequency range, the first stage does not search out optimal available PLMN In the case of, net is searched into second stage, second stage is searched net and carried out in not searching in frequency range for priority RA T and preferred RAT.Can be with Find out, the present invention is the network (namely with multimode terminal known network) that is hit by first search multimode terminal most probable to reach The purpose of net time is searched in the start of international roaming state to shortening multimode terminal.
Brief description of the drawings
Fig. 1 is multimode terminal of embodiment of the present invention start method for searching network flow chart；
Fig. 2 is the structural representation of multimode terminal of the embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and according to embodiment, Technical scheme is described in detail.
In the present invention, the network process of searching when multimode terminal is started shooting is divided into two stages completions：First stage, in multimode terminal Optimal available PLMN (Public Land are searched in the wireless access technology standard (RAT) and frequency range that known network is supported Mobile Network, public land mobile network), second stage is entered in the case where search has no resolution；Second stage, from Preferable not searching in frequency range for RAT and preferred RAT searches for optimal available PLMN.This method for searching network is by first searching for multimode terminal The RAT and frequency range of known network, it can effectively accelerate multimode terminal and search net spee under international roaming state, effectively shorten and search Net the time.
Referring to Fig. 1, Fig. 1 is multimode terminal of embodiment of the present invention start method for searching network flow chart, as shown in figure 1, this method Mainly include the following steps that：
Step 101, optimal available PLMN is searched on the RAT of multimode terminal known network and frequency range；If search most Excellent available PLMN, then multimode terminal is accessed into the optimal available PLMN, otherwise, perform step 102.
In the present embodiment, global operator frequency range carrier information lists are stored in multimode terminal in advance, are transported according to the whole world Seek the RAT and band information of business's frequency range carrier information list determination network related to multimode terminal.
Operator's frequency range carrier information comprises at least herein below：Global operator network number PLMN, RAT, frequency range letter Breath, carrier frequency point information, versions of data mark etc., specifically as shown in Table 1：
Table one
In upper table, global operator network number PLMN, Mobile Country Code MCC (MCC) and Mobile Network Code (MNC) are included. RAT represents the RAT that network corresponding to global operator network number PLMN is supported, particular content can be following a kind of or more Kind RAT：LTE FDD、TD-LTE、WCDMA、TD-SCDMA、GSM、CDMA.Band information represents global operator network number The frequency range that network corresponding to PLMN is supported, particular content can use frequency range number (band (n)) to represent.Carrier frequency point information is The frequency point information that 3GPP ARFCN and EARFCN are defined.Versions of data identifies, for marking the more new version number of certain specific entry, Multimode terminal represents to judge whether this entry needs to update according to versions of data.
Multimode terminal can prestore global operator frequency range carrier information lists, and multimode terminal is in first connection To internet, or, know that the list of global operator frequency range carrier informations occurs in network data base being connected to behind internet During change, global operator frequency range carrier information lists can also be downloaded from network data base and are stored, to realize synchronizing information.
In the present embodiment, multimode terminal known network includes：Last time registration PLMN, Home PLMN and equivalent ownership Network corresponding to PLMN.Wherein, network corresponding to last time registration PLMN is also the preceding network accessed of last shutdown；Ownership PLMN and equivalent Home PLMN are then related to the user ascription area of multimode terminal.
Multimode terminal can be searched in the global operator frequency range carrier information lists prestored last time registration PLMN, Home PLMN and equivalent Home PLMN, it is that the global operator frequency ranges for registering PLMN last time carry by global operator network number Ripple information, global operator network number are Home PLMN global operator frequency ranges carrier information and global operator net Network number all finds out for the global operator frequency range carrier informations of equivalent Home PLMN global operator frequency range carrier informations, Using the RAT and band information that are included in each global operator frequency ranges carrier information found as multimode terminal known network RAT and frequency range.
In addition, when carrying out web search, it is also necessary to the RAT and band information supported in view of multimode terminal itself, When the progress first stage searches net, RAT and band information that multimode terminal itself is supported take into account, moreover, carrying out first When stage searches net, scanned for according to the order of RAT search priorities from high to low, wherein, RAT search priorities are according to from height It is followed successively by low order：The RAT (RAT of access before i.e. last shutdown) of last time access, 4G (forth generation mobile communication skills Art, specifically include two kinds of RAT of LTE FDD and TD-LTE), 3G (3rd generation mobile communication technology, specifically include WCDMA and TD- Two kinds of RAT of SCDMA), 2G (Generation Mobile Telecommunication System technology, specifically including two kinds of RAT of GSM and CDMA).
On the RAT and frequency range (namely RAT and frequency range of the network related to multimode terminal) of multimode terminal known network The specific method for searching for optimal PLMN is as follows：
First between the RAT of multimode terminal support and the RAT of multimode terminal known network is calculated to occur simultaneously (only in the first friendship Web search is carried out on the RAT of concentration, can further reduce hunting zone), and calculate multimode terminal support frequency range with it is more Second between the frequency range of mould terminal known network occurs simultaneously (carries out web search, Ke Yijin in the frequency range in only occuring simultaneously second One step reduces hunting zone)；
According to the order of RAT search priorities from high to low, in the frequency that the common factors of RAT and second that the first common factor includes include Corresponding web search is carried out in section；
If network corresponding to searching last time registration PLMN, will register PLMN last time and be defined as optimal available PLMN, Otherwise,
If searching network corresponding to equivalent Home PLMN or Home PLMN, by the equivalent Home PLMN searched or Home PLMN is defined as optimal available PLMN, otherwise,
If searching user's control PLMN, the user's control PLMN of the limit priority searched is defined as optimal PLMN can be used, otherwise,
If searching operator control PLMN, the operator control PLMN of the limit priority searched is defined as Optimal PLMN can be used, otherwise,
The most strong PLMN of the cell signal searched is defined as optimal available PLMN.
The above-mentioned order according to RAT search priorities from high to low, occur simultaneously in the RAT and second that the first common factor includes and include Frequency range on carry out corresponding web search, that is to say first first occur simultaneously in highest priority RAT and second occur simultaneously include Each frequency range on carry out web search, occur simultaneously again first in the preferential high RAT of level (RAT of the second high priority) and second Carried out in each frequency range that includes of occuring simultaneously web search, the like.
It should be noted that carry out corresponding network in the frequency range that the common factors of RAT and second that the first common factor includes include During search, it is also desirable to scanned for from high to low according to frequency band search priority, wherein frequency band search priority is from high to low Order is followed successively by：Frequency range, equivalent Home PLMN or frequency range, user's control corresponding to Home PLMN corresponding to last time registration PLMN Frequency range, operator control frequency range, other frequency ranges corresponding to PLMN corresponding to PLMN.When first occur simultaneously a certain RAT that includes and , it is necessary to the frequency of the first highest priority in the RAT and second occurs simultaneously during the web search carried out in the frequency range that the second common factor includes Web search is carried out in section, then in the RAT and second occurs simultaneously in the preferential high frequency range of level (frequency range of the second high priority) Web search is carried out, the like.
As can be seen that in the first stage, first purposefully searched in the RAT and frequency range that multimode terminal known network is supported Optimal available PLMN, with the prior art in all RAT and frequency range compared with the planless optimal available PLMN of search, it is clear that It can effectively shorten and search the net time under international roaming state.
Step 102, in not searching in frequency range for preferred RAT and preferred RAT optimal available PLMN is searched for, if searched optimal PLMN can be used, then multimode terminal is accessed into the optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.
In embodiments of the present invention, using WCDMA and GSM as preferred RAT, frequency range is not searched in preferred RAT and preferred RAT Upper carry out web search, preferably RAT frequency range of not searching refer to：Search in the first stage in net (i.e. in step 101), in preferred RAT On carry out searching the frequency range not yet searched for during net, for example, it is assumed that WCDMA support frequency range include：B1, B2, B5, other WCDMA Frequency range, if searched in the first stage, searched on WCDMA and frequency range B1, B2, then B5 and other WCDMA Frequency range does not just search frequency range as WCDMA, therefore, is searched in second stage in net (i.e. in step 102), it is only necessary to WCDMA with Web search is carried out on B5, other WCDMA frequency ranges, it is not necessary to again WCDMA and B1, B2 on the network that is repeated search Rope.
In addition, using WCDMA and GSM as during preferred RAT, it is also desirable to scanned for according to RAT search priority orders, Namely first search for WCDMA and WCDMA and do not search frequency range, search again for GSM and GSM do not search frequency range.Moreover, in preferred TAT and excellent Not searching in frequency range when carrying out web search for RAT is selected, can be according to preferred RAT frequency band search priority order from high to low Scan for.
Search for optimal available PLMN specific method in not searching in frequency range for preferred RAT and preferred RAT and be：First according to The order of WCDMA frequency band searches priority from high to low, optimal available PLMN is searched in not searching in frequency range for WCDMA and WCDMA, If not searching optimal available PLMN, according still further to the order of GSM frequency band searches priority from high to low, GSM's and GSM Do not search in frequency range and search for optimal available PLMN.
In embodiments of the present invention, the frequency range that WCDMA is supported includes：B1(2100MHz)、B2(1900MHz)、B5 (850MHz), other WCDMA frequency ranges.The order of WCDMA frequency band searches priority from high to low is followed successively by：B1, B2, B5, other WCDMA frequency ranges.
According to the order of WCDMA frequency band searches priority from high to low, searched in not searching in frequency range for WCDMA and WCDMA Optimal available PLMN method is specifically as follows：If searching user's control PLMN, by the limit priority searched User's control PLMN is defined as optimal available PLMN, otherwise, if searching operator control PLMN, the highest searched is excellent The operator control PLMN of first level is defined as can use optimal PLMN, and otherwise, the most strong PLMN of the cell signal searched is determined For optimal available PLMN；
In embodiments of the present invention, the frequency range that GSM is supported includes：B8(900MHz)、B5(850MHz)、B3(1800MHz)、 B2 (1900MHz), other GSM frequency ranges.The order of GSM frequency band searches priority from high to low is followed successively by：B8, B5, B3, B2, its His GSM frequency ranges.
According to the order of GSM frequency band searches priority from high to low, GSM and GSM do not search in frequency range search for it is optimal can It is specifically as follows with PLMN method：If searching user's control PLMN, the user of the limit priority searched is controlled PLMN processed is defined as optimal available PLMN, otherwise, if operator control PLMN is searched, by the limit priority searched Operator control PLMN is defined as can use optimal PLMN, otherwise, the most strong PLMN of the cell signal searched is defined as optimal PLMN can be used.
In actual applications, when searching net according to multimode terminal, the band limits of search should be with multimode terminal position (state Family/area) it is related, that is to say, that the frequency range that its frequency range searched for should not use beyond the country /region where multimode terminal Scope, therefore, searched in the second stage of multimode terminal in net, this point can be utilized further to reduce not searching frequently for preferred RAT Segment limit.Specifically way is：Preferred RAT and preferred RAT do not search search for optimal available PLMN in frequency range when, if at first It is not optimal available PLMN to have searched out a certain PLMN and the PLMN, and the PLMN that now can is searched at first using this determines more The location of mould terminal (country /region according to where the PLMN Mobile Country Code MCCs indicated can determine multimode terminal), The frequency that country /region where multimode terminal can be determined by searching global operator frequency range carrier information lists again uses Section, the frequency range that the country /region where seeking multimode terminal uses and the preferred RAT common factor for not searching frequency range, by intersection operation knot Fruit does not search frequency range as preferred RAT's, so as to reach the purpose for not searching band limits for reducing preferred RAT.
Specific in the embodiment of the present invention, specific way is as follows：
During not the searching in frequency range and search for optimal available PLMN of WCDMA and WCDMA, for what is searched first PLMN, if the PLMN is not optimal available PLMN, searches to include in global operator frequency range carrier information lists and be somebody's turn to do The global operator frequency range carrier informations of the Mobile Country Code MCC of PLMN instructions, the global operator frequency range carrier informations that will be found In band information and WCDMA do not search frequency range carry out intersection operation, do not search frequency range using intersection operation result as WCDMA, And continue search for optimal available PLMN in not searching in frequency range for WCDMA and WCDMA.
During not the searching in frequency range and search for optimal available PLMN of GSM and GSM, for the PLMN searched first, If the PLMN is not optimal available PLMN, searches in global operator frequency range carrier information lists and indicated comprising the PLMN Mobile Country Code MCC global operator frequency range carrier informations, by the frequency range in the global operator frequency range carrier informations found Information and GSM frequency range of not searching carry out intersection operation, and frequency range is not searched using intersection operation result as GSM, and in GSM and GSM Do not search in frequency range and continue search for optimal available PLMN.
Multimode terminal of the present invention start method for searching network is described in detail above, present invention also offers one kind to apply The multimode terminal of the above method, is illustrated below in conjunction with Fig. 2.
Referring to Fig. 2, Fig. 2 is the structural representation of multimode terminal of the embodiment of the present invention, as shown in Fig. 2 the multimode terminal bag Include：First search unit 201, the second search unit 202；Wherein
First search unit 201, for searching for optimal available PLMN on the RAT of multimode terminal known network and frequency range, If searching optimal available PLMN, multimode terminal is accessed into the optimal available PLMN；
Second search unit 202, in the case of not searching optimal available PLMN for the first search unit 201, excellent Not searching in frequency range for RAT and preferred RAT is selected to search for optimal available PLMN, it is if searching optimal available PLMN, multimode is whole Terminate into the optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.
Multimode terminal shown in Fig. 2 also includes memory cell 203；
The memory cell 203, for prestoring global operator frequency range carrier information lists；The global operator Frequency range carrier information includes global operator network number PLMN, RAT, band information；
Multimode terminal known network includes：Last time registration PLMN, Home PLMN and network corresponding to equivalent Home PLMN；
First search unit 201, for the global operator frequency ranges carrier information row prestored in memory cell The network number that global operator is searched in table registered the global operator of PLMN, Home PLMN or equivalent Home PLMN for last time Frequency range carrier information, the RAT included in global operator frequency range carrier informations and frequency range will be found as known to multimode terminal The RAT and frequency range of network.
Multimode terminal shown in Fig. 2 also includes synchronization unit 204；
The synchronization unit 204, internet is first connected to for multimode terminal, or, it is connected to mutually in multimode terminal When knowing that the carrier information list of global operator frequency ranges changes in network data base after networking, downloaded from network data base complete The frequency range carrier information list of ball operator and store arrive memory cell, to realize synchronizing information.
In multimode terminal shown in Fig. 2,
First search unit 201 is used when searching for optimal PLMN on the RAT of multimode terminal known network and frequency range In：
First calculated between the RAT of multimode terminal support and the RAT of multimode terminal known network occurs simultaneously, and calculates multimode Second between frequency range and the frequency range of multimode terminal known network that terminal is supported occurs simultaneously；
According to the order of RAT search priorities from high to low, in the frequency that the common factors of RAT and second that the first common factor includes include Corresponding web search is carried out in section；
If network corresponding to searching last time registration PLMN, will register PLMN last time and be defined as optimal available PLMN, Otherwise,
If searching network corresponding to equivalent Home PLMN or Home PLMN, by the equivalent Home PLMN searched or Home PLMN is defined as optimal available PLMN, otherwise,
If searching user's control PLMN, the user's control PLMN of the limit priority searched is defined as optimal PLMN can be used, otherwise,
If searching operator control PLMN, the operator control PLMN of the limit priority searched is defined as Optimal PLMN can be used, otherwise,
The most strong PLMN of the cell signal searched is defined as optimal available PLMN；
Wherein, RAT search priorities are followed successively by according to order from high to low：RAT, 4G, 3G, 2G of last time access.
In multimode terminal shown in Fig. 2,
The preferably RAT includes WCDMA, GSM；
Second search unit 202, preferred RAT and preferred RAT do not search search for optimal available PLMN in frequency range when, For：The first order according to WCDMA frequency band searches priority from high to low, is searched for most in not searching in frequency range for WCDMA and WCDMA Excellent available PLMN, if not searching optimal available PLMN, according still further to the order of GSM frequency band searches priority from high to low, Optimal available PLMN is searched in not searching in frequency range for GSM and GSM.
Multimode terminal shown in Fig. 2 also includes memory cell 203；
The memory cell 203, for prestoring global operator frequency range carrier information lists；The global operator Frequency range carrier information includes global operator network number PLMN, RAT, band information；In global operator network number PLMN Including Mobile Country Code MCC and Mobile Network Code；
Second search unit 202, the optimal available PLMN process of searching for is not searched in frequency range in WCDMA and WCDMA In, for the PLMN searched first, if the PLMN is not optimal available PLMN, in global operator frequency range carrier informations The global operator frequency range carrier informations of the Mobile Country Code MCC comprising PLMN instructions are searched in list, the whole world found is transported Battalion business's frequency range carrier information in band information and WCDMA do not search frequency range carry out intersection operation, using intersection operation result as WCDMA's does not search frequency range, and continues search for optimal available PLMN in not searching in frequency range for WCDMA and WCDMA；
Second search unit 202, it is right during not the searching in frequency range and search for optimal available PLMN of GSM and GSM In the PLMN searched first, if the PLMN is not optimal available PLMN, in global operator frequency range carrier information lists The middle global operator frequency range carrier informations for searching the Mobile Country Code MCC comprising PLMN instructions, the global operator that will be found The frequency range of not searching of band information and GSM in frequency range carrier information carries out intersection operation, using intersection operation result as GSM not Frequency range is searched, and optimal available PLMN is continued search in not searching in frequency range for GSM and GSM.
In multimode terminal shown in Fig. 2,
The order of WCDMA frequency band searches priority from high to low is followed successively by：B1, B2, B5, other WCDMA frequency ranges；
Second search unit 202, according to the order of WCDMA frequency band searches priority from high to low, in WCDMA and When not the searching in frequency range of WCDMA searches for optimal available PLMN, it is used for：If user's control PLMN is searched, by what is searched The user's control PLMN of limit priority is defined as optimal available PLMN, otherwise, if searching operator control PLMN, will search Rope to limit priority operator control PLMN be defined as can use optimal PLMN, otherwise, by the cell signal searched most Strong PLMN is defined as optimal available PLMN；
The order of GSM frequency band searches priority from high to low is followed successively by：B8, B5, B3, B2, other GSM frequency ranges；
Second search unit 202, according to the order of GSM frequency band searches priority from high to low, GSM's and GSM Do not search in frequency range when searching for optimal available PLMN, be used for：It is if searching user's control PLMN, the highest searched is preferential The user's control PLMN of level is defined as optimal available PLMN, otherwise, if searching operator control PLMN, will search most The operator control PLMN of high priority is defined as can use optimal PLMN, otherwise, by the most strong PLMN of the cell signal searched It is defined as optimal available PLMN.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.

Claims (14)

  1. The method for searching network 1. a kind of multimode terminal is started shooting, it is characterised in that this method includes：
    Optimal available PLMN is searched on the RAT of multimode terminal known network and frequency range, if searching optimal available PLMN, Multimode terminal is accessed into the optimal available PLMN, otherwise,
    Optimal available PLMN is searched in not searching in frequency range for preferred RAT and preferred RAT, if searching optimal available PLMN, Multimode terminal is accessed into the optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.
  2. 2. according to the method for claim 1, it is characterised in that
    Multimode terminal prestores global operator frequency range carrier information lists；The global operator frequency ranges carrier information includes Global operator network number PLMN, RAT, band information；
    Multimode terminal known network includes：Last time registration PLMN, Home PLMN and network corresponding to equivalent Home PLMN；
    The network number that multimode terminal searches global operator in the global operator frequency range carrier information lists prestored is Last time registration PLMN, Home PLMN or equivalent Home PLMN global operator frequency range carrier informations, will find global operation RATs and frequency range of the RAT and frequency range included in business's frequency range carrier information as multimode terminal known network.
  3. 3. according to the method for claim 2, it is characterised in that
    Multimode terminal is first connected to internet, or, know global operator in network data base being connected to behind internet When frequency range carrier information list changes, download global operator frequency range carrier information lists from network data base and store, To realize synchronizing information.
  4. 4. according to the method for claim 1, it is characterised in that
    The method that optimal PLMN is searched on the RAT of multimode terminal known network and frequency range is：
    First calculated between the RAT of multimode terminal support and the RAT of multimode terminal known network occurs simultaneously, and calculates multimode terminal Second between the frequency range of support and the frequency range of multimode terminal known network occurs simultaneously；
    According to the order of RAT search priorities from high to low, occur simultaneously in the RAT and second that the first common factor includes in the frequency range included Carry out corresponding web search；
    If searching network corresponding to the last time registration PLMN, last time registration PLMN is defined as optimal available PLMN, otherwise,
    If search network corresponding to the equivalent Home PLMN or Home PLMN, the equivalent ownership that will be searched PLMN or Home PLMN are defined as optimal available PLMN, otherwise,
    If searching user's control PLMN, the user's control PLMN of the limit priority searched is defined as optimal available PLMN, otherwise,
    If searching operator control PLMN, the operator control PLMN of the limit priority searched is defined as can use Optimal PLMN, otherwise,
    The most strong PLMN of the cell signal searched is defined as optimal available PLMN；
    Wherein, RAT search priorities are followed successively by according to order from high to low：RAT, 4G, 3G, 2G of last time access.
  5. 5. according to the method for claim 1, it is characterised in that
    The preferably RAT includes WCDMA, GSM；
    Search for optimal available PLMN method in not searching in frequency range for preferred RAT and preferred RAT and be：First searched according to WCDMA frequency ranges The order of rope priority from high to low, optimal available PLMN is searched in not searching in frequency range for WCDMA and WCDMA, if do not searched for To optimal available PLMN, then the order according still further to GSM frequency band searches priority from high to low, in not searching in frequency range for GSM and GSM Search for optimal available PLMN.
  6. 6. according to the method for claim 5, it is characterised in that
    Multimode terminal prestores global operator frequency range carrier information lists；The global operator frequency ranges carrier information includes Global operator network number PLMN, RAT, band information；Global operator network number PLMN include Mobile Country Code MCC and Mobile Network Code；
    During not the searching in frequency range and search for optimal available PLMN of WCDMA and WCDMA, for the PLMN searched first, If the PLMN is not optimal available PLMN, searches in global operator frequency range carrier information lists and indicated comprising the PLMN Mobile Country Code MCC global operator frequency range carrier informations, by the frequency range in the global operator frequency range carrier informations found Information and WCDMA frequency range of not searching carry out intersection operation, and frequency range is not searched using intersection operation result as WCDMA, and in WCDMA And not searching in frequency range for WCDMA continues search for optimal available PLMN；
    During not the searching in frequency range and search for optimal available PLMN of GSM and GSM, for the PLMN searched first, if The PLMN is not optimal available PLMN, then the shifting for including PLMN instructions is searched in global operator frequency range carrier information lists The global operator frequency range carrier informations of dynamic national code, by the band information in the global operator frequency range carrier informations found Intersection operation is carried out with GSM frequency range of not searching, frequency range is not searched using intersection operation result as GSM, and in GSM and GSM not Search in frequency range and continue search for optimal available PLMN.
  7. 7. according to the method for claim 6, it is characterised in that
    The order of WCDMA frequency band searches priority from high to low is followed successively by：B1, B2, B5, other WCDMA frequency ranges；
    According to the order of WCDMA frequency band searches priority from high to low, WCDMA and WCDMA do not search in frequency range search for it is optimal Can be with PLMN method：If searching user's control PLMN, by the user's control PLMN of the limit priority searched It is defined as optimal available PLMN, otherwise, if operator control PLMN is searched, by the operator of the limit priority searched Control PLMN is defined as can use optimal PLMN, otherwise, the most strong PLMN of the cell signal searched is defined as optimal available PLMN；
    The order of GSM frequency band searches priority from high to low is followed successively by：B8, B5, B3, B2, other GSM frequency ranges；
    According to the order of GSM frequency band searches priority from high to low, optimal can use is searched in not searching in frequency range for GSM and GSM PLMN method is：If searching user's control PLMN, the user's control PLMN of the limit priority searched is determined For optimal available PLMN, otherwise, if searching operator control PLMN, the operator of the limit priority searched is controlled PLMN is defined as can use optimal PLMN, otherwise, the most strong PLMN of the cell signal searched is defined as into optimal available PLMN.
  8. 8. a kind of multimode terminal, it is characterised in that the multimode terminal includes：First search unit, the second search unit；
    First search unit, for searching for optimal available PLMN on the RAT of multimode terminal known network and frequency range, if Optimal available PLMN is searched, then multimode terminal is accessed into the optimal available PLMN；
    Second search unit, in the case of not searching optimal available PLMN for the first search unit, in preferred RAT and It is preferred that optimal available PLMN is searched in not searching in frequency range for RAT, should by multimode terminal access if searching optimal available PLMN Optimal available PLMN, otherwise, it determines multimode terminal is currently without network service.
  9. 9. multimode terminal according to claim 8, it is characterised in that the multimode terminal also includes memory cell；
    The memory cell, for prestoring global operator frequency range carrier information lists；The global operator frequency ranges carry Ripple information includes global operator network number PLMN, RAT, band information；
    Multimode terminal known network includes：Last time registration PLMN, Home PLMN and network corresponding to equivalent Home PLMN；
    First search unit, for being searched in the global operator frequency range carrier information lists that are prestored in memory cell Global operator network number is the global operator frequency range carrier waves for last time registering PLMN, Home PLMN or equivalent Home PLMN Information, will find the RAT included in global operator frequency range carrier informations and band information as with multimode terminal Hownet The RAT and band information of network.
  10. 10. multimode terminal according to claim 9, it is characterised in that the multimode terminal also includes synchronization unit；
    The synchronization unit, internet is first connected to for multimode terminal, or, obtained after multimode terminal is connected to internet When knowing that the carrier information list of global operator frequency ranges changes in network data base, global operator is downloaded from network data base The list of frequency range carrier information and store arrive memory cell, to realize synchronizing information.
  11. 11. multimode terminal according to claim 8, it is characterised in that
    First search unit is used for when searching for optimal PLMN on the RAT of multimode terminal known network and frequency range：
    First calculated between the RAT of multimode terminal support and the RAT of multimode terminal known network occurs simultaneously, and calculates multimode terminal Second between the frequency range of support and the frequency range of multimode terminal known network occurs simultaneously；
    According to the order of RAT search priorities from high to low, occur simultaneously in the RAT and second that the first common factor includes in the frequency range included Carry out corresponding web search；
    If searching network corresponding to the last time registration PLMN, last time registration PLMN is defined as optimal available PLMN, otherwise,
    If search network corresponding to the equivalent Home PLMN or Home PLMN, the equivalent ownership that will be searched PLMN or Home PLMN are defined as optimal available PLMN, otherwise,
    If searching user's control PLMN, the user's control PLMN of the limit priority searched is defined as optimal available PLMN, otherwise,
    If searching operator control PLMN, the operator control PLMN of the limit priority searched is defined as can use Optimal PLMN, otherwise,
    The most strong PLMN of the cell signal searched is defined as optimal available PLMN；
    Wherein, RAT search priorities are followed successively by according to order from high to low：RAT, 4G, 3G, 2G of last time access.
  12. 12. multimode terminal according to claim 8, it is characterised in that
    The preferably RAT includes WCDMA, GSM；
    Second search unit, preferred RAT and preferred RAT do not search search for optimal available PLMN in frequency range when, be used for：First According to the order of WCDMA frequency band searches priority from high to low, optimal can use is searched in not searching in frequency range for WCDMA and WCDMA PLMN, if not searching optimal available PLMN, according still further to the order of GSM frequency band searches priority from high to low, in GSM and Optimal available PLMN is searched in not searching in frequency range for GSM.
  13. 13. multimode terminal according to claim 12, it is characterised in that the multimode terminal also includes memory cell；
    The memory cell, for prestoring global operator frequency range carrier information lists；The global operator frequency ranges carry Ripple information includes global operator network number PLMN, RAT, band information；Global operator network number PLMN includes moving Dynamic national code and Mobile Network Code；
    Second search unit, during not the searching in frequency range and search for optimal available PLMN of WCDMA and WCDMA, for The PLMN searched first, if the PLMN is not optimal available PLMN, in global operator frequency range carrier information lists The global operator frequency range carrier informations of the Mobile Country Code MCC comprising PLMN instructions are searched, by the global operator found frequencies The frequency range of not searching of band information and WCDMA in section carrier information carries out intersection operation, using intersection operation result as WCDMA's Frequency range is not searched, and continues search for optimal available PLMN in not searching in frequency range for WCDMA and WCDMA；
    Second search unit, during not the searching in frequency range and search for optimal available PLMN of GSM and GSM, for first The PLMN searched, if the PLMN is not optimal available PLMN, searched in global operator frequency range carrier information lists The global operator frequency range carrier informations of Mobile Country Code MCC comprising PLMN instructions, the global operator frequency ranges found are carried The frequency range of not searching of band information and GSM in ripple information carries out intersection operation, and frequency is not searched using intersection operation result as GSM Section, and continue search for optimal available PLMN in not searching in frequency range for GSM and GSM.
  14. 14. multimode terminal according to claim 13, it is characterised in that
    The order of WCDMA frequency band searches priority from high to low is followed successively by：B1, B2, B5, other WCDMA frequency ranges；
    Second search unit, according to the order of WCDMA frequency band searches priority from high to low, in WCDMA and WCDMA not Search in frequency range when searching for optimal available PLMN, be used for：If search user's control PLMN, the limit priority that will be searched User's control PLMN be defined as optimal available PLMN, otherwise, if search operator control PLMN, the highest that will be searched The operator control PLMN of priority is defined as can use optimal PLMN, otherwise, the most strong PLMN of the cell signal searched is true It is set to optimal available PLMN；
    The order of GSM frequency band searches priority from high to low is followed successively by：B8, B5, B3, B2, other GSM frequency ranges；
    Second search unit, according to the order of GSM frequency band searches priority from high to low, frequency range is not searched in GSM and GSM During the optimal available PLMN of upper search, it is used for：If searching user's control PLMN, by the user of the limit priority searched Control PLMN is defined as optimal available PLMN, otherwise, if searching operator control PLMN, the limit priority that will be searched Operator control PLMN be defined as can use optimal PLMN, otherwise, the most strong PLMN of the cell signal searched is defined as most Excellent available PLMN.
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