CN101610565A - The method of searching public land mobile network and device - Google Patents

The method of searching public land mobile network and device Download PDF

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Publication number
CN101610565A
CN101610565A CNA2009100883545A CN200910088354A CN101610565A CN 101610565 A CN101610565 A CN 101610565A CN A2009100883545 A CNA2009100883545 A CN A2009100883545A CN 200910088354 A CN200910088354 A CN 200910088354A CN 101610565 A CN101610565 A CN 101610565A
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frequency
search
portable terminal
frequency range
public land
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CN101610565B (en
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杨明洪
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Beijing T3G Technology Co Ltd
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Beijing T3G Technology Co Ltd
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Abstract

The invention provides a kind of method and portable terminal of searching public land mobile network, belong to communication technical field, at first from the measuring system information of the current persistent district of portable terminal, obtain the measurement frequency of all sub-districts, determine and measure the affiliated frequency range of frequency; The band limits of supporting according to portable terminal is chosen the search frequency range that needs search from the frequency range of determining then; Secondly after the search frequency range is selected, on the search frequency range, choose the search frequency; On the search frequency, search for the public land mobile network PLMN that portable terminal can be used at last, thereby can effectively shorten the time of mobile terminal to search PLMN network.

Description

The method of searching public land mobile network and device
Technical field
The invention belongs to communication technical field, relate in particular to method and the device of a kind of mobile terminal to search PLMN (public land mobile network) based on TDD (time division multiplexing) standard.
Background technology
Overall procedure according to UE (portable terminal) start-up logging of present 3GPP agreement specified standard is described, and wherein the overall process of portable terminal registration is: at first should select a suitable PLMN network after the UE start; In the PLMN network of choosing, select the sub-district then, after finding the sub-district, from system information broadcast, just can know the information of adjacent cells, this UE just can choose the best sub-district of signal resident down in all these sub-districts like this, last UE can initiate location registration, when this UE after the success just successfully resides in this sub-district.
Describe as seen from above-mentioned flow process, the PLMN network selection is the interaction flow that primarily carries out signaling behind the mobile terminal-opening, only just can carry out the selection and the park operation of sub-district after finding the PLMN network.For example, in TDD-LCR (time division multiplexing is hanged down the spreading rate standard) system, portable terminal can regular automatic search or user manually initiate to search for all available PLMN networks.In this process; portable terminal is when the TDD-LCR frequency range that search is supported; frequency grid according to the TDD-LCR frequency; pursue the frequency IV interval of 0.2MHz, simultaneously, because wireless signal has Lin Dao to leak; therefore one exist the actual signal frequency around on the Lin Dao; as skew+/-0.2MHz ,+/-Lin Dao of 0.4MHz etc. on, enter PLMN information through regular meeting's mistake and read.Will search for a frequency range like this needs the very long time could search for a frequency range, and as in actual field, having searched for 2010MHz～2025MHz frequency range needs 20s～30s time of (second).
Yet in realizing process of the present invention, find that there is following problem at least in prior art: in the method for existing search PLMN network, need the long time owing to searched for a frequency range, therefore can reduce the performance of mobile terminal to search PLMN network, and then influence user's normal use.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of method and device of searching public land mobile network, can effectively shorten the time of mobile terminal to search PLMN network.
In order to achieve the above object, the invention provides a kind of method of searching public land mobile network, described method comprises:
Steps A, from the measuring system information of the current persistent district of portable terminal, obtain the measurement frequency of all sub-districts, determine the frequency range under the described measurement frequency;
Step B, according to the band limits that described portable terminal is supported, from the frequency range of determining, choose the search frequency range that needs search;
Step C, after the search frequency range is selected, on described search frequency range, choose the search frequency;
Step D, the public land mobile network PLMN that the described portable terminal of search can be used on described search frequency.
Preferably, described step D is specially:
The public land mobile network PLMN that the described portable terminal of search can be used on described search frequency;
When on described search frequency, searching the public land mobile network PLMN that described portable terminal can use, skip at least one carrier widths, again the public land mobile network PLMN that can use at the described portable terminal of the next one search enterprising line search of frequency.
Preferably, described method also comprises:
Step e, judge whether search frequency on the described search frequency range is searched for and finish that if search does not finish, repeat described step C to step D, all the search frequencies on described search frequency range are all searched for and finished.
Preferably, described method also comprises:
Step F, judge whether that all search frequency ranges are all searched for and finish,, repeat described step B, all search for up to the frequency range of all described portable terminal supports and finish to described step e if search does not finish.
Preferably, described step C comprises:
Step C11, when for the first time choosing the search frequency, the frequency values that frequency is searched in primary election is set to the frequency values of center frequency point of the frequency range of the current persistent district of portable terminal;
Step C12, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
Preferably, described step C comprises:
Step C21, when the search frequency among the described step D is described measurement frequency, the frequency values that frequency is searched in primary election be set to the frequency values of the search frequency among the described step D and carrier widths value and;
Step C22, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
Preferably, described step C comprises:
Step C31, when search searches available public land mobile network PLMN on the frequency in described step D, the frequency values that the frequency values that frequency is searched in primary election is set to the search frequency among the described step D and carrier widths value with;
Step C32, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
Preferably, described portable terminal is for supporting the portable terminal of the low spreading rate TDD-LCR standard of time division multiplexing.
Preferably, the portable terminal of the low spreading rate TDD-LCR standard of described support time division multiplexing is for supporting the single mode portable terminal of the low spreading rate TDD-LCR standard of time division multiplexing, perhaps for supporting the multi-module mobile terminal of the low spreading rate TDD-LCR standard of time division multiplexing.
Preferably, the multi-module mobile terminal of the low spreading rate TDD-LCR standard of described support time division multiplexing is for supporting the mode mobile terminal of the low spreading rate TDD-LCR standard of global system for mobile communications GSM/ time division multiplexing.
Preferably, in described step D,, directly read the public land mobile network PLMN information of storing in the described portable terminal if when the frequency of current search is the measurement frequency of described persistent district.
The present invention also provides a kind of device of searching public land mobile network, and described device comprises:
Acquisition module is used for determining the affiliated frequency range of described measurement frequency from the measurement frequency of all sub-districts of measuring system information acquisition of the current persistent district of portable terminal;
Frequency range is chosen module, is used for the band limits according to described portable terminal support, chooses the search frequency range that needs search from the frequency range of determining;
Frequency is chosen module, is used for choosing the search frequency on described search frequency range after the search frequency range is selected;
The frequency search module is used for the public land mobile network PLMN that the described portable terminal of search can be used on described search frequency.
At least one technical scheme in the technique scheme has following beneficial effect: by obtain the measurement frequency of all sub-districts from the measuring system information of the current persistent district of portable terminal, the band limits of supporting according to this portable terminal and the measurement frequency of acquisition then, determine the search frequency, the last PLMN network that the search portable terminal can be used on this search frequency, the frequency information of the measurement frequency by obtaining all sub-districts is searched for the PLMN network that portable terminal can be used, can avoid in the prior art can effectively shortening the time of mobile terminal to search PLMN network because of need carry out the problem of IV interval by the frequency of 0.2MHz.For example in actual field, 5～6 frequency values are arranged, then can be shortened to 10s～15s this search time if measure the sub-district.
Description of drawings
Fig. 1 is the method flow diagram of search PLMN network in the embodiments of the invention;
Fig. 2 is the method flow diagram of primary election search frequency in the embodiments of the invention;
Fig. 3 is for confirming to obtain searching for the method flow diagram of frequency in the embodiments of the invention;
Fig. 4 is the method flow diagram of the PLMN that the search portable terminal can be used on the search frequency of determining in the embodiments of the invention;
Fig. 5 is the device block diagram of search PLMN network in the embodiments of the invention.
Embodiment
In the present embodiment, at first from the measuring system information of the current persistent district of portable terminal, obtain the measurement frequency of all sub-districts, the band limits of supporting according to this portable terminal and the measurement frequency of acquisition then, determine the search frequency, the last PLMN network that the search portable terminal can be used on this search frequency.
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the embodiment of the invention is done explanation in further detail below in conjunction with embodiment and accompanying drawing.At this, illustrative examples of the present invention and explanation are used to explain the present invention, but not as a limitation of the invention.
Referring to Fig. 1, be the method flow diagram of search PLMN network in the embodiments of the invention, concrete steps are as follows:
Step 101, from the measuring system information of the current persistent district of portable terminal, obtain the measurement frequency of all sub-districts, determine the affiliated frequency range of this measurements frequency;
For example, when portable terminal resides in the TDD-LCR pattern, after the task of starting the available PLMN network on all TDD-LCR frequency ranges of search, at first can be from the measurement frequency of all sub-districts of acquisition in the measuring system information of current persistent district, the measurement frequency of these all sub-districts comprises: the frequency of current persistent district and the frequency that faces the sub-district, above-mentioned frequency belongs to the frequency in the TDD-LCR frequency range, can be 2010MHz～2025MHz or 1880～1920MHz etc. as the TDD-LCR frequency range.
In the present embodiment, can be to the processing of classifying of the frequency range under the measurement frequency that obtains, for example can be with frequency range according to from the low frequency to the high-frequency, sorting, can obtain the measurement frequency point information of each frequency range this moment, this measurement frequency point information comprises: the frequency values of the number of measurement frequency and concrete measurement frequency, if do not find in certain frequency range to measure frequency, then the number of this measurement frequency can be set to 0.
Above-mentioned portable terminal can be a portable terminal of supporting the TDD-LCR standard.Be example only in the introduction below with the portable terminal of supporting the TDD-LCR standard, certainly the portable terminal of this support TDD-LCR standard can be a single mode portable terminal of supporting the TDD-LCR standard, perhaps for supporting the multi-module mobile terminal of TDD-LCR standard, the multi-module mobile terminal of above-mentioned support TDD-LCR standard can be a mode mobile terminal of supporting GSM (global system for mobile communications)/TDD-LCR standard, also is not limited to this certainly.
Step 102, according to the band limits that this portable terminal is supported, from the frequency range of determining, choose the search frequency range that needs search;
When selecting the portable terminal of supporting TDD-LCR one-segment standard for use, because this supports the portable terminal of TDD-LCR standard to support 2010MHz～2025MHz frequency range, therefore can choose the search frequency range that needs search from the frequency range of determining by step 102, this search frequency range is 2010MHz～2025MHz.
When selecting the portable terminal of supporting TDD-LCR multiband standard for use, because this supports the portable terminal of TDD-LCR multiband to support 1880MHz～1920MHz and 2010MHz～2025MHz two-band, can select this moment one of them frequency range such as 2010MHz～2025MHz to search for earlier for the search frequency range, when whole frequency all search for finish after, can judge whether that all band supports are all searched for finishes, if can other frequency range such as 1880MHz～1920MHz of this portable terminal support be searched for.
Step 103, after the search frequency range is selected, on this search frequency range, choose the search frequency;
In the present embodiment, choosing the flow process of searching for frequency on this search frequency range comprises: the flow process of primary election search frequency and the flow process that primary election search frequency is confirmed.Referring to Fig. 2, be the method flow diagram of primary election search frequency in the present embodiment, concrete steps are as follows:
Step 201, judge whether to choosing for the first time search frequency f, if, execution in step 204, otherwise, execution in step 202;
In the TDD-LCR pattern, the carrier widths of this TDD-LCR is 1.6MHz, frequently grid are 0.2MHz, if with 2010MHz～2025MHz frequency range is example, this center frequency point may be at 2010.8MHz between the 2024.2MHz, if is at interval with 0.2MHz, can primary election searches for frequency f this moment and be set to 2010.8MHz.
Search frequency f before step 202, the judgement 0Whether be to measure frequency, if, execution in step 205, otherwise, execution in step 203;
Search frequency before is the frequency in the step 104 just, can obtain this primary election search frequency according to the Search Results of step 104, for example can be according to search frequency f in the determining step 104 0Whether be the result who measures frequency, draw this primary election search frequency f.
Search frequency f before step 203, the judgement 0On whether can search available PLMN network, if, execution in step 207, otherwise, execution in step 206;
Can judge on this frequency, whether to search available PLMN network according to the Search Results in the step 104.
The frequency values that frequency f is searched in step 204, primary election is set to the frequency values of center frequency point;
With 2010MHz～2025MHz is example, and between the 2024.2MHz, if be at interval with 0.2MHz, the frequency values that this moment can primary election search first time frequency f is set to 2010.8MHz to possible center frequency point at 2010.8MHz.
The frequency values that frequency f is searched in step 205, primary election is set to search frequency f in the step 104 0Frequency values and the carrier widths value and;
That is search frequency f in frequency values=step 104 of primary election search frequency f, 0Frequency values+carrier widths value, wherein, this carrier widths value can be 1.6MHz.
The frequency values that frequency f is searched in step 206, primary election is set to search frequency f in the step 104 0Frequency values and grid value frequently and;
That is search frequency f in frequency values=step 104 of primary election search frequency f, 0Frequency values+frequency grid value, wherein, this frequency grid value can be 0.2MHz.
The frequency values that frequency f is searched in step 207, primary election is set to search frequency f in the step 104 0Frequency values and the carrier widths value and;
That is search frequency f in frequency values=step 104 of primary election search frequency f, 0Frequency values+carrier widths value, wherein, this carrier widths value can be 1.6MHz.
When primary election search frequency choose finish after, confirm to obtain searching for frequency according to this primary election search frequency again, referring to Fig. 3, for confirming to obtain searching for the method flow diagram of frequency in the embodiments of the invention, concrete steps are as follows:
Step 301, acquisition primary election search frequency;
Just obtain the primary election search frequency that is provided with in the above-mentioned steps 204～207.
Step 302, judge whether the number of the measurement frequency in the frequency range of the current persistent district of portable terminal is zero, if, execution in step 303, otherwise, execution in step 304;
Step 303, with primary election search for frequency point setting for the search frequency;
Just, will be the search frequency by the primary election search frequency point setting that step 201～207 obtain.
Step 304, judge current frequency range the frequency values of measurement frequency whether greater than the frequency values f of primary election search frequency, and less than the frequency values of primary election search frequency and carrier widths value with, if, execution in step 305; Otherwise, execution in step 303;
This step can repeat, and up to having detected measurement frequencies all on the current frequency range, for example can judge whether to have detected measurement frequencies all on the current frequency range by the mode of counting.
Step 305, will measure frequency point setting for the search frequency;
Just, with the measurement frequency on the current frequency range of portable terminal as the search frequency.
By execution in step 201～207, and step 301～305 can determine the search frequency, PLMN network that then can the search portable terminal can be used on the search frequency of determining, and promptly execution in step 104.
Step 104, the PLMN network that the search portable terminal can be used on the search frequency;
Referring to Fig. 4, be the method flow diagram of the PLMN that the search portable terminal can be used on the search frequency of determining in the embodiments of the invention, concrete steps are as follows:
Whether step 401, judgement search frequency are the measurement frequency of the current persistent district of portable terminal, if, execution in step 402, otherwise, execution in step 403;
Step 402, from the measuring system information of current area, obtain the information of PLMN network;
Step 403, rough position are synchronous;
In the rough position synchronizing process of descending pilot frequency time slot, by the TD-SCDMA frame characteristics as can be known, the power of protection symbol before and after the descending synchronous code power that the descending pilot frequency time slot in each subframe sends is higher than far away.Therefore, can utilize the power structure feature of above-mentioned subframe, a power features window is set, seek the rough position of descending pilot frequency time slot by the power features window.
For example: it is 8 symbols that power features window length is set, and divided by the both sides power sum of totally 4 symbols, can obtain the ratio of this power features window with the power sum of middle 4 symbols.By the whole sub-frame data that receives is carried out same power features window ratio calculation and slip ratio, maximizing in all power features window ratios, the pairing position of this maximum is the rough position of the descending pilot frequency time slot in this subframe.
The precision of the rough position of above-mentioned definite descending pilot frequency time slot depends on the power features window when sliding selected interval, short more at interval, determine that the precision of rough position of descending pilot frequency time slot is high more.The rough position of the descending pilot frequency time slot that the employing said method is determined can reach the precision of 1 symbol level.
Step 404, exact position are synchronously and confirm code character;
Descending pilot frequency time slot is carried out on the synchronous basis of rough position above-mentioned, portable terminal can receive one section data that contain descending synchronous code, and the exact position of descending pilot frequency time slot is based on synchronously that these data carry out.
The synchronous process in the exact position of descending pilot frequency time slot is:
At first, utilize the data that contain descending synchronous code one by one all descending synchronous codes to be carried out matching treatment, each descending synchronous code and these data are carried out matched filtering and are obtained one group of matched filtering related power value; Secondly, in each group matched filtering related power value, choose maximum and write down correspondence position, if this maximum simultaneously greater than predefined thresholding, this maximum is the measured value of this descending synchronous code correspondence.
Can obtain the measured value and the relevant position of all descending synchronous codes through above-mentioned processing, simultaneously adjust descending pilot frequency time slot synchronously, can reach the precision of 1 chip after the adjustment according to the pairing position of descending synchronous code of measured value maximum in all descending synchronous codes;
Step 405, cell scrambling detect;
Portable terminal just can find the training sequence part data of time slot 0 after the descending pilot frequency time slot exact position is synchronous.Carry out relevantly with the training sequence data of the time slot 0 that receives respectively with 4 basic training sequences sign indicating number/scramblers of each descending synchronous code correspondence, calculate related power.
For search cell, the pairing basic training sequences sign indicating number/scrambler of related power maximum is basic training sequences sign indicating number/scrambler that search cell is used;
Step 406, phase-detection;
At first the data that comprise training sequence code of receiving slot 0 utilize the basic training sequences sign indicating number of search cell to carry out channel estimating; Utilize the used descending synchronous code of this channel estimating and search cell to carry out convolution then, compare with the descending synchronous code partial data that comprises that receives, can obtain the phase modulation information of the descending synchronous code of corresponding subframe by the sequence that will obtain.According to the TD-SCDMA system features, this phase place is exclusively used in indication mechanism information interlacing frames, so after obtaining continuous several phase place, can detect the interlacing frames of system information;
The information of step 407, PLMN network reads;
In carrying out above-mentioned steps,, directly arrive step 105, and this failure information may be used in step 103 next time if any one process search failure then stops other processes in this step.
Whether the frequency on step 105, the judgement search frequency range is searched for and is finished, if search does not finish, repeated execution of steps 103 arrives step 104, and all frequencies on the search frequency range are all searched for and finished;
Step 106, judge whether that frequency on all frequency ranges is all searched for and finish that if search does not finish, repeated execution of steps 102 is to step 104, all search for up to the frequency range of all portable terminal supports and finish.
As shown from the above technical solution, the frequency information of the measurement frequency by obtaining all sub-districts is searched for the PLMN network that portable terminal can be used, avoided pursuing the problem of the frequency IV interval of 0.2MHz in the prior art because of need, thereby can effectively shorten the time of mobile terminal to search PLMN network.For example in actual field, 5～6 frequency values are arranged, then can be shortened to 10s～15s this search time if measure the sub-district.
In order to realize above-mentioned method embodiment, other embodiment of the present invention also provide a kind of device of searching public land mobile network.What need at first explanation in addition is; because following embodiment is for realizing aforesaid method embodiment; so the module in this device all is to establish for each step that realizes preceding method; but the present invention is not limited to following embodiment, and any device of said method and module of realizing all should be contained in protection scope of the present invention.And in the following description, the content identical with preceding method omitted at this, to save length.
Referring to Fig. 5, be the device block diagram of search PLMN network in the embodiments of the invention, this device comprises:
Acquisition module is used for determining the affiliated frequency range of described measurement frequency from the measurement frequency of all sub-districts of measuring system information acquisition of the current persistent district of portable terminal;
Frequency range is chosen module, is used for the band limits according to described portable terminal support, chooses the search frequency range that needs search from the frequency range of determining;
Frequency is chosen module, is used for choosing the search frequency on described search frequency range after the search frequency range is selected;
The frequency search module is used for the public land mobile network PLMN that the described portable terminal of search can be used on described search frequency.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (12)

1. the method for a searching public land mobile network is characterized in that, described method comprises:
Steps A, from the measuring system information of the current persistent district of portable terminal, obtain the measurement frequency of all sub-districts, determine the frequency range under the described measurement frequency;
Step B, according to the band limits that described portable terminal is supported, from the frequency range of determining, choose the search frequency range that needs search;
Step C, after the search frequency range is selected, on described search frequency range, choose the search frequency;
Step D, the public land mobile network PLMN that the described portable terminal of search can be used on described search frequency.
2. method according to claim 1 is characterized in that, described step D is specially:
The public land mobile network PLMN that the described portable terminal of search can be used on described search frequency;
When on described search frequency, searching the public land mobile network PLMN that described portable terminal can use, skip at least one carrier widths, again the public land mobile network PLMN that can use at the described portable terminal of the next one search enterprising line search of frequency.
3. method according to claim 2 is characterized in that, described method also comprises:
Step e, judge whether search frequency on the described search frequency range is searched for and finish that if search does not finish, repeat described step C to step D, all the search frequencies on described search frequency range are all searched for and finished.
4. method according to claim 3 is characterized in that, described method also comprises:
Step F, judge whether that all search frequency ranges are all searched for and finish,, repeat described step B, all search for up to the frequency range of all described portable terminal supports and finish to described step e if search does not finish.
5. method according to claim 4 is characterized in that, described step C comprises:
Step C11, when for the first time choosing the search frequency, the frequency values that frequency is searched in primary election is set to the frequency values of center frequency point of the frequency range of the current persistent district of portable terminal;
Step C12, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
6. method according to claim 4 is characterized in that, described step C comprises:
Step C21, when the search frequency among the described step D is described measurement frequency, the frequency values that frequency is searched in primary election be set to the frequency values of the search frequency among the described step D and carrier widths value and;
Step C22, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
7. according to the method for claim 4, it is characterized in that described step C comprises:
Step C31, when search searches available public land mobile network PLMN on the frequency in described step D, the frequency values that the frequency values that frequency is searched in primary election is set to the search frequency among the described step D and carrier widths value with;
Step C32, when the number of the measurement frequency in the frequency range of the current persistent district of described portable terminal is zero, primary election is searched for frequency point setting for searching plain frequency.
8. according to claim 5 or 6 or 7 described methods, it is characterized in that described portable terminal is for supporting the portable terminal of the low spreading rate TDD-LCR standard of time division multiplexing.
9. method according to claim 8, it is characterized in that, the portable terminal of the low spreading rate TDD-LCR standard of described support time division multiplexing is for supporting the single mode portable terminal of the low spreading rate TDD-LCR standard of time division multiplexing, perhaps for supporting the multi-module mobile terminal of the low spreading rate TDD-LCR standard of time division multiplexing.
10. method according to claim 9, it is characterized in that the multi-module mobile terminal of the low spreading rate TDD-LCR standard of described support time division multiplexing is for supporting the mode mobile terminal of the low spreading rate TDD-LCR standard of global system for mobile communications GSM/ time division multiplexing.
11. method according to claim 10 is characterized in that, in described step D,
If when the frequency of current search is the measurement frequency of described persistent district, directly read the public land mobile network PLMN information of storing in the described portable terminal.
12. the device of a searching public land mobile network is characterized in that, described device comprises:
Acquisition module is used for determining the affiliated frequency range of described measurement frequency from the measurement frequency of all sub-districts of measuring system information acquisition of the current persistent district of portable terminal;
Frequency range is chosen module, is used for the band limits according to described portable terminal support, chooses the search frequency range that needs search from the frequency range of determining;
Frequency is chosen module, is used for choosing the search frequency on described search frequency range after the search frequency range is selected;
The frequency search module is used for the public land mobile network PLMN that the described portable terminal of search can be used on described search frequency.
CN2009100883545A 2009-06-26 2009-06-26 Method and device for searching public land mobile network Expired - Fee Related CN101610565B (en)

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CN103052138A (en) * 2011-09-02 2013-04-17 联发科技（新加坡）私人有限公司 Network-searching method and device for multimode UE (user equipment)
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CN102883410B (en) * 2012-09-25 2015-05-13 公安部第三研究所 Method for searching global system for mobile communication (GSM) base station cell global identity by using neighboring cell information
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