CN105578564A - Network searching method of mobile terminal - Google Patents
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- CN105578564A CN105578564A CN201410554521.1A CN201410554521A CN105578564A CN 105578564 A CN105578564 A CN 105578564A CN 201410554521 A CN201410554521 A CN 201410554521A CN 105578564 A CN105578564 A CN 105578564A
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Abstract
The invention provides a network searching method of a mobile terminal. When the mobile terminal fails to find an accessible network according to the network searching sequence prescribed by the protocols of the mobile terminal, PLMN (Public Land Mobile Network) in a recently registered network list (RRPLMN) are ordered according to the distances from the terminal to candidate network base stations, and network searching is carried out in the sequence from near to long distance; and thus, historical and present information of the geographical position of the terminal is effectively used, time for registration success in the new network is shortened to the largest extent under the condition that the mobile terminal leaves the network of the registration location, and the network searching efficiency and flexibility are greatly improved.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of method for searching network of mobile terminal.
Background technology
In recent years along with the fast development of mobile communication technology, the speed of mobile communications network upgrading is also more and more faster.In the process of mobile network's fast development, constantly have new operator to enter moving communicating field, some Incumbents also enter some emerging nations progressively exploring world market.
New operators and Incumbent, when entering emerging market, often only can be set up the communication network of a new generation, such as, originally have the network of GSM, and just set up 3G network, originally had 3G network, and just set up LTE network.In networking process, on the one hand because new network can not accomplish the seamless all standing of region fast, new and old network also has different features on the other hand, can accomplish the effect complemented each other, therefore, within the quite a long time, there will be multiple network and the situation of depositing.And these new operators can not start from scratch, oneself sets up the mobile network of often kind of access technology, and in order to utilize local all mobile networks, these new operators become a way generally adopted with some local operator signature roaming agreements.
3GPP is as an International Organization for standardization, define HPLMN (HomePublicLandMobileNetwork in the protocol, ownership place Public Land Mobile Nerwork), EHPLMN (HPLMN of equivalence), " PLMN that user controls " and " PLMN that operator controls " controls the priority selecting network, these informational needs are stored in SIM card, but SIM card is once be issued in user's hand, these information just cannot have modified, and the mobile communications network in the whole world is very many, these operators all complete be listed in SIM card both unrealistic, also be impossible.And network configuration and state are all changing at any time, roaming relationships between operator also can constantly change because of various reasons, therefore, in actual applications, the use of each operator to " PLMN that user controls " and " PLMN that operator controls " is all more careful, generally all can not arrange these data in SIM card.If there is new operator to enter, if original SIM card provided is without renewal, also up-to-date network environment cannot be reflected.This is with regard to meaning for regard to each mobile terminal, except ownership place PLMN (HPLMN), other be all common PLMN, each other concerning not what difference terminal.
The selecting sequence that current 3GPP searches net for PLMN is such:
1.RPLMN；
2.EHPLMN or ownership place PLMN (HPLMN);
3. the PLMN of user's control;
4. the PLMN of operator's control;
5. " PLMN/ wireless access technology " combination that other signal quality is good, certain PLMN in this list of Stochastic choice;
6. other " PLMN/ wireless access technology " combines, according to the fine or not arranged in sequence of signal quality;
Wherein, the 1st RPLMN is that PLMN resident before shutdown, and this PLMN is stored in the memory (NVRAM of such as terminal) of terminal self, can change at any time; 2nd, 3,4 class PLMN are stored in SIM card, change to get up to be not easy, and general user, once after obtaining a SIM card, may can not go to the business hall of operator to upgrade for several years; 5th class PLMN is then the situation depending on terminal detected wireless signals at that time; Generally can not use the 6th class PLMN.When not considering the 6th class PLMN, this expression with flow chart searches net flow process as shown in Figure 1.
In FIG, for the 5th class PLMN, " PLMN/ wireless access technology " combination that namely signal quality is good, the selection of this kind of PLMN has random feature, this means when front 4 class PLMN all can not resident, mobile terminal may selecting properly to the PLMN of cooperation operator, also may choose the PLMN of non-cooperation operator.Once choose the PLMN of non-cooperation operator, the registration request of mobile terminal can be rejected.The cause value of network refusal registration request is divided into two classes, and under a class reason, the PLMN of search can be put into forbidden list by terminal, another kind of cause value, and terminal can not put into forbidden list PLMN.Due to once PLMN is put into forbidden list, when searching net next time again, this PLMN would not be searched for again, so all access technologies under this PLMN are all unavailable.In order to avoid the generation of this situation, network generally can not refuse the registration request of terminal with the cause value making terminal PLMN be put into forbidden list.
Due to these reasons above, although define " operator control PLMN " and " forbiddenPLMNlist " in 3GPP, these can search the mechanism of net by control PLMN, but in fact because will write dead in SIM card, or configure-reject reason revising network side etc. is not easy the factor changed, operability is lower, does not even have what practical effect.These reasons can cause terminal after the PLMN leaving registered place, and the longer time all will be spent to search can the network of successful registration at every turn, and it is not high therefore to search net efficiency.
For solving the problem, most mobile terminal all carried out optimization to searching network process at present in real network, to the PLMN once registering merits and demerits, mobile terminal can be stored in the list (RRPLMN of recent registration network according to the order of time order and function, RecentlyRegisteredPLMN) (as shown in Figure 3) in list, the priority of the arrangement that the time is more late is higher.When the HPLMN that user controls or the HPLMN of network control cannot register, just according to the precedence of PLMN priority in RRPLMN, search for PLMN one by one, as long as can successful registration network, just exit search procedure.Now, search net flow process just to become by process as shown in Figure 2.
As shown in Figure 3, each PLMN of the nearest resident mistake of RRPLMN list records and success is resident at that time time point.Wherein, each PLMNid likely has multiple access technology, no matter by which kind of access technology to succeed in registration PLMN, succeed in registration all at last, if PLMNid is identical, and access technology is different, or access technology is identical and PLMNid is different, all think different networks.In order to simplified characterization, below describe in no longer distinguish PLMN and network.Due in real network, for the network outside ownership place, the possibility that the network once succeeded in registration succeeds in registration again is very large, like this under current real network environment, adopt the mobile terminal of prior art, than complete according to 3GPP agreement advise to search net flow process more effective, in most cases can be successfully registered to network faster.That is, under the prior art, add this memory cell of RRPLMN, putting in order of the candidate network in this table is the time order and function that basis succeeds in registration, and that is, the time of successful registration is more late, and the priority of this network is higher.
If the moving direction of mobile terminal is always towards a direction, carrying out priority of disposing order according to time order and function can solve prior art Problems existing preferably, improve and search net efficiency.But, mobile terminal can not move towards a direction all the time, and its moving direction still presents randomized feature, that is, the mobile terminal nearest network crossed of successful registration in time, the change along with mobile terminal locations might not be again that the possibility of successful registration is maximum.On the other hand, for same PLMN, different region user rights is also different, although be RPLMN so before, has changed region location, might not have permission.
Than situation as shown in Figure 4, have three can the network of successful registration, access technology is all identical, is PLMN1, PLMN2 and PLMN3 respectively.The direction of fast mobile terminal is A->B->C->D, originally terminal is successfully registered to PLMN1, afterwards through the region of one section of no signal, arrive B and be successfully registered to PLMN2, afterwards again through the region of one section of no signal, arrive C and be successfully registered to PLMN3, finally arriving D.From time relationship, PLMN resident is recently PLMN3, and terminal should be registered to PLMN3 when D position, but obviously, now attempt being registered to the successful possibility of PLMN1 maximum, and the PLMN1 PLMN that to be not the nearest success of calculating from the time resident.
Therefore, under the prior art, the mobile terminal successful possibility of registered network in new network environment that have left former ownership place can only be improved to a certain extent, adopt this trial to add network that recent registration in time becomes merits and demerits, or the situation of random selecting may be formed, thus increasing the number of times attempted, net efficiency is searched in impact.
Summary of the invention
For solving problems of the prior art, improving and searching net efficiency, the invention provides a kind of method for searching network of mobile terminal, comprise the following steps:
S1: the net order of searching that mobile terminal specifies according to its agreement carries out searching net;
S2: when the network that can add cannot be searched out, mobile terminal inquires about its network once added from its network list;
S3: the distance calculating the position of the network that described mobile terminal once added from its current location to it respectively, and attempt selecting corresponding network to add according to described distance order from small to large.
Further, the position of network that described mobile terminal once added is the position of the base station of this network.
Further, in step s3, when only having a coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described coal addition position and described mobile terminal, and obtain the distance e of described coal addition position to the base station of described network;
Obtain described mobile terminal from described coal addition position to the distance s of its current location;
According to formula
calculate the average distance d of described mobile terminal from the base station of above-mentioned network to its current location using as described distance.
Further, in step s3, when having two coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described mobile terminal, and the coordinate (x of the first coal addition position
a, y
a), the coordinate (x of the second coal addition position
b, y
b), described first coal addition position is to the distance r of described second coal addition position, and described first coal addition position is to the distance a of the base station of described network, and described second coal addition position is to the distance b of the base station of described network;
Determine that the coordinate of described base station location is the first coordinate or the second coordinate;
Obtain described mobile terminal from described first coordinate to the distance d1 of its current location, from described second coordinate to the distance d2 of its current location;
Draw described distance d;
Wherein, the first coordinate and the second coordinate are respectively
d＝(d1+d2)/2。
Further, in step s3, when having more than three coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described mobile terminal, and the coordinate (x of the first coal addition position
a, y
a), the coordinate (x of the second coal addition position
b, y
b), described first coal addition position is to the distance r of described second coal addition position, described first coal addition position is to the distance a of the base station of described network, and described second coal addition position is to the distance b of the base station of described network, and the 3rd coal addition position is to the distance c of the base station of described network;
Determine that the coordinate of described base station location is the first coordinate or the second coordinate, described first coordinate or the second coordinate are respectively
More described 3rd coal addition position to described first coordinate Distance geometry described in the 3rd coal addition position to the distance of described second coordinate, if described 3rd coal addition position to the distance of described first coordinate closer to c, then determine that described first coordinate is base station location, otherwise then determine that the position of described second coordinate is base station location;
Calculate the distance of the base station location after determining to described mobile terminal current location.
Further, acquisition coal addition position to the method for the distance of network base station is: acquisition time lead in the random access procedure when adding this network, regular according to the communication pattern of described Timing Advance and this network, draw the distance of coal addition position to network base station.
Further, the described Timing Advance of acquisition is stored in described network list.
Further, the method for searching network of described mobile terminal also comprises: select to add the network failure once added if attempt, then attempting Stochastic choice residue has the network of signal to add.
Further, described network is Public Land Mobile Nerwork.
Further, described agreement is 3GPP.
Method for searching network of the present invention compared with prior art, sort changing into according to the method that time order and function order searches net the PLMN in RRPLMN according to the order of the spacing of terminal and candidate base station, effectively make use of historical information and the current information in geographical position residing for terminal, when mobile terminal leaves belonging area network, shortening in the new network registry successful time of maximum possible, substantially increases the efficiency and flexibility of searching net.
Accompanying drawing explanation
Fig. 1 is that the terminal specified in 3GPP agreement searches net flow process.
Fig. 2 of the prior artly searches net flow process.
Fig. 3 is the structural representation of RRPLMN list in prior art.
Fig. 4 is a kind of situation of mobile terminal movement between different PLMN in prior art.
Fig. 5 is the relation of TA and uplink and downlink timeslot under gsm system.
Fig. 6 is the flow chart of the method for searching network of mobile terminal described in one embodiment of the invention.
The RRPLMN list structure that Fig. 7 is the method for searching network of mobile terminal described in one embodiment of the invention.
In the method for searching network of Fig. 8 for mobile terminal described in one embodiment of the invention, the schematic diagram when there being a coal addition position known in the network that mobile terminal once added.
In the method for searching network of Fig. 9 for mobile terminal described in one embodiment of the invention, the schematic diagram when there being two coal addition position known in the network that mobile terminal once added.
In the method for searching network of Figure 10 for mobile terminal described in one embodiment of the invention, the schematic diagram when there being three coal addition position known in the network that mobile terminal once added.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
First the concept of Timing Advance in the communications field is introduced at this.Timing Advance (TA) is the abbreviation of TimingAdvance, for gsm system, uplink and downlink time slot itself has the delay of 3 time slots, after terminal obtains sequential relationship by detection down channel, determine the lead of up transmission relative to the up transmission of network side of end side according to TA, and this lead and the distance between terminal and network there is very large relation.General when there is no a barrier between terminal and base station, the distance between terminal and base station be substantially the light velocity within the time of TA range ability 1/2.As shown in Figure 5, in gsm system, can carry out random access procedure in registration process, network sends in the physical message of terminal (physicalinformation) and comprises TA value in the random access procedure.The span of TA is 0 ~ 63, unit is 48/13us, corresponding distance is about 550 meters, therefore, at least the range estimation precision between terminal and network can be reached 550m, if putting at certain the TA obtained is 5, so the distance of terminal and base station is approximately about 5*550=2750 rice, if and TA is 7, terminal and base station must apart from about being approximately 7*550=3850 rice.
Equally, in LTE system, also Stochastic accessing can be carried out in registration process, in the random access procedure, terminal will receive arbitrary access response (RandomAccessResponse) this message, and comprises the TACommand of 11 bits in this message, its span is TA (0,1,2 ... 1282), the unit of each TA is 16T
s, wherein T
s=1/ (15000 × 2048) second, being converted into distance according to the light velocity is exactly 78.125 meters, and the longest denotable radius of society is 100 kilometers.Therefore the TACommand received according to terminal also can obtain the approximate distance of terminal distance base station.
Therefore, in the process of network insertion, terminal can obtain TA value, and according to the different communication modes rule adopted, can obtain the distance of coal addition position to network base station by diverse ways.Inventor expects utilizing the above-mentioned distance obtained, and attempts the network added, search net efficiency to improve according to the distance of distance.
When terminal will use RRPLMN to carry out PLMN search, distance between the geographical position of the terminal first recorded in the current residing geographical position of computing terminal and RRPLMN list once successful registration PLMN time institute access base station, those positions that this distance is shorter, the PLMN priority once registering merits and demerits is there higher, is therefore come before list.In fact arrange sequencing from geographical position because consider the randomness of fast mobile terminal, more more reasonable than arranging sequencing afterwards from temporal elder generation, the order of searching net is just carried out according to the order of this PLMN list.Certainly, due to usually can not be visual mutually between base station and terminal, especially under the dense urban environment of building, the distance accuracy being come computing terminal and base station by TA can not be accomplished very high, but have employed TA, still having larger confidence level than not adopting TA to carry out estimated distance.Particularly in comparatively spacious area, calculate distance accuracy with TA still very high.
Fig. 6 is the flow chart of the method for searching network of mobile terminal described in one embodiment of the invention, as shown in Figure 6, with prior art shown in Fig. 2 search compared with net flow process, sort changing into according to the method that time order and function order searches net the PLMN in RRPLMN according to the order between terminal and candidate base station.Now, as shown in Figure 7, this is a two-dimensional storage structure to the structure of RRPLMN.Each PLMNid records the TA information obtained in the geographical location information of maximum recently 3 terminals that once successful registration is crossed and random access procedure, if exceeded 3 information, just geographical location information the oldest on the time is deleted.Each geographical location information represents with (Xpi, Ypi), Xpi and Ypi represents longitude when being once successfully registered to PLMNid residing for mobile terminal and latitude respectively.The maximum number of PLMNid represents with M.This table can be preserved on the sim card, also can be kept on the read-only storage of mobile terminal itself, and the value of M can decide according to the performance of the size of memory space and mobile terminal itself.
Specifically, when the PLMN that RPLMN, HPLMN/EHPLMN, user control and the PLMN that operator controls cannot succeed in registration time, and it is finally resident to when other PLMN, the geographical location information just obtaining the current place of this mobile terminal (obtains the method for mobile terminal geographic position information and can pass through the system such as GPS or big-dipper satellite, not the content that the present invention describes in detail), be expressed as (X, Y), and the TA obtained when succeeding in registration, be stored in RRPLMN list.
Be stored in each PLMN in RRPLMN list, several situation may be there is in its information obtained, namely only this PLMN may once be resided in a position, also may once reside in this PLMN two different positions, also likely once reside in this PLMN three different positions.Below divide three kinds of situations difference computing terminals with the distance between candidate base station.
Situation one: as shown in Figure 8, when only having that one once chartered some A is known, assuming that the B point position that to be terminal current, distance between A point and B point is s, calculating A point with the approximate distance of candidate base station according to TA is r, so candidate base station may be distributed in A point as the center of circle, radius is on the circular arc of r, but which point on circular arc uncertain be on earth, rational estimation is exactly the average distance of B point with every bit on this circular arc at computing terminal place, as distance candidate base station average distance, so average distance square average be exactly:
Therefore can think that the average distance of terminal distance objective base station is
Situation two: when having that two once chartered point is known, as shown in Figure 9, terminal accessed same community at A point and B point, certain PLMNid is also identical, the distance so estimated respectively between A point and base station according to TA when A point and B point access community is roughly a, and the approximate distance of B point and base station is b.According to these two information, can show that the Position Approximate of base station may be C point or D point.
Determine that can there be a lot of method the position of C point and D point, below illustrate a kind of method wherein,
A point coordinates is (x
a, y
a), B point coordinates is (x
b, y
b), now
So the coordinate of D point is: (x
a+ a*cos β, y
a+ a*sin β),
Can obtain equally, γ=α+θ-pi/2,
So the coordinate of C point is (x
a-a*sin γ, y
a-a*cos γ).
In sum, can by the coordinate (x of the first coal addition position A point
a, y
a), the coordinate (x of the second coal addition position B point
b, y
b), A point is to the distance r of B point, A point to the distance a of the base station of described network, and B point is to the distance b of the base station of described network, show that the coordinate of base station location is
, i.e. the coordinate of C point and D point in Fig. 9.After the coordinate obtaining C point and D point, obtain described mobile terminal from described first coordinate to the distance d1 of (C point) its current location, from described second coordinate (D point) to the distance d2 of its current location.Average distance so between computing terminal and candidate base station is just reduced to the average distance of computing terminal with C point and D point.Terminal can, according to the distance of terminal distance C point and D point at that time, decide to interrupt the average distance between candidate base station, i.e. d=(d1+d2)/2.
Situation three: when there is three known points, as shown in Figure 10, if terminal once accessed same community at A point, B point and E point, PLMNID is also identical certainly, the TA obtained when simultaneously obtaining each access, so the approximate location of base station is just near the joining (in Figure 10 D point) of three circles.When three points are known, determine that the roughly method of base station location is such, first determined the position of two possible candidate base stations by two known points, this method described in former case two.Then in two candidate base stations is determined by the 3rd point.Because TA value can only determine a distance roughly, therefore three circles differ and intersect on a point surely, need approximate means between two candidate points, determine the position of base station like this.
If C point and D point are the positions of the candidate base station obtained by method described in situation two.For convenience of statement, be (x at the coordinate of this hypothesis C point
c, y
c), the coordinate of D point is (x
d, y
d), and the coordinate of the 3rd access point E point is (x
e, y
e), calculate the distance of C point and D point distance E point respectively, then compare the magnitude relationship of the radius (RE-TA) that two distances determine with E point place TA, that close point is exactly possible position, base station.
So the distance between C point and E point is:
distance between D point and E point is:
judge which candidate base station may be the method for target BS and be: if |
c-E-
e-TA> | d
d-E-
e-TA|, then select the position of D point alternatively base station; Otherwise, select the position of C point alternatively base station.
After the approximate location determining candidate base station, just can calculate the distance of the base station location after determining to described mobile terminal current location.
In sum, for each network id (PLMNid is with the combination of access technology), terminal, according to the number of obtainable once resident successful position, carrys out the average distance of computing terminal with the candidate base station of this PLMNid, as the reference distance Dp of this network.
Terminal arranges the priority of all-network after calculating with the average distance of each plmn candidate base station according to reference distance Dp.Dp is less, and priority is larger.Mobile terminal carries out the trial of PLMN registration according to this order, once certain network registry success, then exits cut-and-try process, and is again updated in RRPLMN list by the geographical location information of current mobile terminal.
If all PLMN in RRPLMN list cannot succeed in registration, again according to the requirement of 3GPP, attempt the good PLMN of quality be left immediately, and once quality good PLMN success is resident, also positional information time resident for success and TA are stored in RRPLMN list.
Key point of the present invention is, after leaving former ownership place PLMN, is successfully registered to new network at every turn, and mobile terminal all preserves the TA information obtained in geographical location information at that time residing for terminal and random access procedure; In the PLMN controlled in PLMN and the operator of RPLMN, HPLMN/EHPLMN, user's control cannot succeed in registration, average distance when what calculating mobile terminal was preserved together once succeeds in registration between candidate base station approximate location, according to the principle that the nearlyer priority of distance is higher, carry out the search of PLMN and the trial of registration; And, become the number in the place of merits and demerits to be one according to once resident PLMN, two or three and more than, adopt different mechanism to carry out computing terminal with the average distance between candidate base station, and determine that terminal accesses the sequencing of certain PLMN with this distance.
Compared with prior art, the present invention does not increase any hardware spending, and the storage organization that just pattern of wants is special in software, the increase on operand is for the computing capability of present chip, also negligible.Meanwhile, this way proposed by the invention neither violates the specification of 3GPP, too increases very large flexibility simultaneously.In addition, present invention utilizes the stationkeeping ability that present smart mobile phone generally has, and the TA information that can obtain in the random access procedure, effectively make use of historical information and the current information in geographical position residing for terminal, when mobile terminal leaves belonging area network, maximum possible shorten in the new network registry successful time, the possibility refused by network when also reducing terminal registration network to a certain extent.This is for lifting Consumer's Experience, and the continuity keeping terminal to do business has obvious benefit.In sum, the present invention improves from many aspects performance and the efficiency that mobile terminal searches net.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a method for searching network for mobile terminal, is characterized in that, comprises the following steps:
S1: the net order of searching that mobile terminal specifies according to its agreement carries out searching net;
S2: when the network that can add cannot be searched out, mobile terminal inquires about its network once added from its network list;
S3: the distance calculating the position of the network that described mobile terminal once added from its current location to it respectively, and attempt selecting corresponding network to add according to described distance order from small to large.
2. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, the position of the network that described mobile terminal once added is the position of the base station of this network.
3. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, in step s3, when only having a coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described coal addition position and described mobile terminal, and obtain the distance e of described coal addition position to the base station of described network;
Obtain described mobile terminal from described coal addition position to the distance s of its current location;
According to formula
calculate the average distance d of described mobile terminal from the base station of above-mentioned network to its current location using as described distance.
4. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, in step s3, when having two coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described mobile terminal, and the coordinate (x of the first coal addition position
a, y
a), the coordinate (x of the second coal addition position
b, y
b), described first coal addition position is to the distance r of described second coal addition position, and described first coal addition position is to the distance a of the base station of described network, and described second coal addition position is to the distance b of the base station of described network;
Determine that the coordinate of described base station location is the first coordinate or the second coordinate;
Obtain described mobile terminal from described first coordinate to the distance d1 of its current location, from described second coordinate to the distance d2 of its current location;
Draw described distance d;
Wherein, the first coordinate and the second coordinate are respectively
d＝(d1+d2)/2。
5. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, in step s3, when having more than three coal addition position known in a certain network that described mobile terminal once added, the method calculating described distance is:
Determine the current location of described mobile terminal, and the coordinate (x of the first coal addition position
a, y
a), the coordinate (x of the second coal addition position
b, y
b), described first coal addition position is to the distance r of described second coal addition position, described first coal addition position is to the distance a of the base station of described network, and described second coal addition position is to the distance b of the base station of described network, and the 3rd coal addition position is to the distance c of the base station of described network;
Determine that the coordinate of described base station location is the first coordinate or the second coordinate, described first coordinate or the second coordinate are respectively
More described 3rd coal addition position to described first coordinate Distance geometry described in the 3rd coal addition position to the distance of described second coordinate, if described 3rd coal addition position to the distance of described first coordinate closer to c, then determine that described first coordinate is base station location, otherwise then determine that the position of described second coordinate is base station location;
Calculate the distance of the base station location after determining to described mobile terminal current location.
6. the method for searching network of mobile terminal as described in claim 3-5 any one, it is characterized in that, acquisition coal addition position to the method for the distance of network base station is: acquisition time lead in the random access procedure when adding this network, regular according to the communication pattern of described Timing Advance and this network, draw the distance of coal addition position to network base station.
7. the method for searching network of mobile terminal as claimed in claim 6, it is characterized in that, the described Timing Advance of acquisition is stored in described network list.
8. the method for searching network of mobile terminal as claimed in claim 1, is characterized in that, also comprise: select to add the network failure once added if attempt, then attempting Stochastic choice residue has the network of signal to add.
9. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, described network is Public Land Mobile Nerwork.
10. the method for searching network of mobile terminal as claimed in claim 1, it is characterized in that, described agreement is 3GPP.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109548114A (en) * | 2018-10-24 | 2019-03-29 | 努比亚技术有限公司 | Public land mobile network cut-in method, terminal and computer readable storage medium |
| CN111447648A (en) * | 2019-01-16 | 2020-07-24 | 华为技术有限公司 | Data transmission method, related equipment and system |
| CN111447648B (en) * | 2019-01-16 | 2021-09-14 | 华为技术有限公司 | Data transmission method, related equipment and system |
| CN111050378A (en) * | 2019-12-12 | 2020-04-21 | Oppo广东移动通信有限公司 | Network searching method and device and electronic equipment |
| CN112040533A (en) * | 2020-08-18 | 2020-12-04 | 广东小天才科技有限公司 | Network searching control method and device for terminal equipment and terminal equipment |
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