CN105554857A - Cell selection method and terminal - Google Patents
Cell selection method and terminal Download PDFInfo
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- CN105554857A CN105554857A CN201610055410.5A CN201610055410A CN105554857A CN 105554857 A CN105554857 A CN 105554857A CN 201610055410 A CN201610055410 A CN 201610055410A CN 105554857 A CN105554857 A CN 105554857A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/06—Access restriction performed under specific conditions based on traffic conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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Abstract
The embodiment of the invention provides a cell selection method and a terminal, wherein the method comprises the following steps that: in the process of being started and executing cell section, a terminal reads a system message on a broadcast control channel BCCH frequency point of a current cell; the terminal judges whether the current cell is a forbidden cell or not according to the read system message on the BCCH frequency point; if not, the terminal judges whether the current cell supports an emergency call or not according to the system message on the BCCH frequency point; if so, the terminal judges whether the path loss principle parameter C1 of the current cell is greater than 0 or not according to the system message on the BCCH frequency point; and if so, the terminal is resident in the current cell. By means of the embodiment of the invention, the fact that the terminal is resident in the cell supporting the emergency call without a card can be ensured; and the emergency call of the terminal can be normally initiated.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of cell selecting method and terminal.
Background technology
After starting up of terminal, first can find network and and network get in touch, to obtain the service of network.In prior art, when terminal is without card time, BCCH (the BroadcastControlChannel that the terminal signal strength signal intensity that can select to meet community selection criterion is best, Broadcast Control Channel) community carries out resident, if emergence call service is not supported in the resident community of terminal, then can cause cannot initiating urgent call in this community without card terminal, thus affect the normal use of user, cause unnecessary loss to user.
Summary of the invention
Embodiments provide a kind of cell selecting method and terminal, can guarantee that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.
First aspect, embodiments provides a kind of cell selecting method, comprising:
Perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH channel of broadcast control frequency of current area;
According to the system message on the described BCCH frequency read, described terminal judges that whether described current area is for forbidding community;
If not, then according to the system message on described BCCH frequency, described terminal judges whether described current area supports urgent call;
If support, then according to the system message on described BCCH frequency, described terminal judges whether the path loss principle parameter C1 of described current area is greater than 0;
If be greater than, then described terminal resides in described current area.
In conjunction with first aspect, in the first possible implementation of first aspect, according to the system message on the described BCCH frequency read, described terminal judges that whether described current area is for forbidding community, comprising:
According to the system message 3 on described BCCH frequency and/or the community in system message 4, described terminal forbids that access identifier judges that whether described current area is for forbidding community;
According to the system message on described BCCH frequency, described terminal judges whether described current area supports urgent call, comprising:
According to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4, described terminal judges whether described current area supports urgent call.
In conjunction with first aspect, or the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, described terminal also comprises before reading the system message on the BCCH channel of broadcast control frequency of current area:
Described terminal locates the public land mobile network PLMN in the region of described terminal after powering;
Described terminal selects the target P LMN in described PLMN to described Terminal for service;
Described terminal locks each frequency in described target P LMN successively according to the order that signal strength signal intensity is descending, the frequency correction channel of the target frequency of search Current lock;
Whether target frequency described in described terminal judges is BCCH frequency;
If so, then described terminal is come synchronous with described BCCH frequency by synchronous channel SCH.
In conjunction with first aspect, or the first possible implementation of first aspect, in the third possible implementation of first aspect, described terminal does not install Subscriber Identity Module.
In conjunction with first aspect, or the first possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, described terminal is mobile station MS or user equipment (UE).
Second aspect, embodiments provides a kind of terminal, comprising:
First reading unit, for performing in the process of community selection after starting up of terminal, reads the system message on the BCCH channel of broadcast control frequency of current area;
According to the system message on the described BCCH frequency read, first judging unit, for judging that whether described current area is for forbidding community;
According to the system message on described BCCH frequency, second judging unit, if judge that described current area is non-ly forbid community for described first judging unit, then judges whether described current area supports urgent call;
According to the system message on described BCCH frequency, 3rd judging unit, if judge that urgent call is supported in described current area for described second judging unit, then judges whether the path loss principle parameter C1 of described current area is greater than 0;
Resident element, if judge that the C1 of described current area is greater than 0 for described 3rd judging unit, then resides in described current area.
In conjunction with second aspect, in the first possible implementation of second aspect, described first judging unit specifically for:
Forbid that access identifier judges that whether described current area is for forbidding community according to the system message 3 on described BCCH frequency and/or the community in system message 4;
Described second judging unit specifically for:
Judge whether described current area supports urgent call according to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4.
In conjunction with second aspect, or the first possible implementation of second aspect, in the implementation that the second of second aspect is possible, described terminal also comprises:
Determining unit, for locating the public land mobile network PLMN in the region of described terminal after starting up of terminal;
Selected cell, for selecting the target P LMN in described PLMN to described Terminal for service;
Search unit, locks each frequency in described target P LMN successively for the order descending according to signal strength signal intensity, the frequency correction channel of the target frequency of search Current lock;
4th judging unit, for judging whether described target frequency is BCCH frequency;
Lock unit, if judge that described target frequency is BCCH frequency for described 4th judging unit, then comes synchronous with described BCCH frequency by synchronous channel SCH.
In conjunction with second aspect, or the first possible implementation of second aspect, in the third possible implementation of second aspect, described terminal does not install Subscriber Identity Module.
In conjunction with second aspect, or the first possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, described terminal is mobile station MS or user equipment (UE).
By implementing the embodiment of the present invention, perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH frequency of current area, judge that whether current area is for forbidding community according to the system message of this BCCH frequency, if not, then according to the system message of this BCCH frequency, described terminal judges whether current area supports urgent call, if support, then described terminal judges whether the C1 parameter value of current area is greater than 0 further, if, then terminal is on the current cell resident, thus realizes the normal initiation of urgent call.It is hereby ensured that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of a kind of cell selecting method that the embodiment of the present invention provides;
Fig. 2 is the schematic flow sheet of the another kind of cell selecting method that the embodiment of the present invention provides;
Fig. 3 is the structural representation of a kind of terminal that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the another kind of terminal that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the another kind of terminal that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Terminal described in following embodiment includes but not limited to the travelling carriage (MobileStation in 2G network, MS) subscriber equipment (UserEquipment, in 3G and 4G network, UE), can include but not limited to: mobile phone (as Android phone, iOS mobile phone etc.), panel computer, personal digital assistant (PersonalDigitalAssistant, PDA), Intelligent worn device (intelligent watch etc.) or other possess the mobile terminal device of communication function.
Embodiments provide a kind of cell selecting method and terminal, can guarantee that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.Below be described in detail respectively.
Refer to Fig. 1, Fig. 1 is the schematic flow sheet of a kind of cell selecting method that the embodiment of the present invention provides.As shown in Figure 1, this cell selecting method is applied to terminal, and the method can include but not limited to following steps.
S101, perform after starting up of terminal in the process selected community, described terminal reads the system message on the BCCH channel of broadcast control frequency of current area.
According to the system message on the described BCCH frequency read, S103, described terminal judge that whether described current area is for forbidding community, if not, perform step S105; If so, step S101 is returned.
According to the system message on described BCCH frequency, S105, described terminal judge whether described current area supports urgent call, if so, perform step S107; If not, step S101 is returned.
According to the system message on described BCCH frequency, S107, described terminal judge whether the path loss principle parameter C1 of described current area is greater than 0, if so, perform step S109; If not, step S101 is returned.
S109, described terminal reside in described current area.
In the embodiment of the present invention, terminal carries out cell selection procedure after powering, described terminal reads the system message on the BCCH frequency of current area, judge that whether described current area is for forbidding community according to the system message on this BCCH frequency, if not, then according to the system message on this BCCH frequency, described terminal judges whether described current area supports urgent call further, if, then according to the system message on described BCCH frequency, described terminal judges whether the path loss principle parameter C1 of described current area is greater than 0 further, if be greater than, then described current area is suitable community, described terminal is carried out resident in described current area, otherwise described terminal will reselect another community as described current area, repeat above flow process.It should be noted that, described terminal is the terminal of not installing Subscriber Identity Module, described Subscriber Identity Module includes but not limited to: USIM (UniversalSubscriberIdentityModule) card and SIM (SubscriberIdentityModule, SIM) card.
Wherein, at GSM (GlobalSystemforMobileCommunication, global system for mobile communications) define a parameter in specification and be called path loss principle C1, so-called suitable community must ensure the C1 > 0 of this community, C1=(A-Max (B, 0)), A=RXLEV-RXLEV_ACCESS_MIN (dBm), B=MS_TXPWR_MAX_CCH-P (dBm), wherein, the average level that RXLEV=terminal receives, the peak power output level that P=travelling carriage (MS) can provide, minimum incoming level required for RXLEV_ACCESS_MIN=MS connecting system, spendable maximum transmit power level during MS_TXPWR_MAX_CCH=MS connecting system.C1 is calculated by each terminal, it defines the overlay area of each community, and outside this community, C1 is negative; It determines the boundary selected between two neighbor cells in the standby state, and the parameter calculating C1 is broadcasted in system message by network.
As the optional execution mode of one, according to the system message on the described BCCH frequency read, described terminal judges that whether described current area is for forbidding community, comprising:
According to the system message 3 on described BCCH frequency and/or the community in system message 4, described terminal forbids that access identifier judges that whether described current area is for forbidding community.
According to the system message on described BCCH frequency, described terminal judges whether described current area supports urgent call, comprising:
According to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4, described terminal judges whether described current area supports urgent call.
Concrete, terminal reads the system message type 3 on the BCCH frequency of current area, or system message type 4, RACH (RandomAccessChannel is included in system message type 3 or system message type 4, Random Access Channel) control message, containing parameter CELLBARACCESS (access is forbidden in community) in RACH control message, according to this identifier of CELLBARACCESS, described terminal judges that whether described current area is for forbidding community, if this identifier of CELLBARACCESS is notBarred, then show that described current area is non-ly forbid community, if this identifier of CELLBARACCESS is Barred, then show that described current area is for forbidding community, also comprise in RACH control message and allow urgent call identifier EC (EmergencyCallallowed, the whether permission terminal of network configuration initiates urgent call mark), if this EC identifier is 0, then show that urgent call is supported in described current area, if this EC identifier is 1, then show that urgent call is not supported in described current area.
Visible, in the method described by Fig. 1, perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH frequency of current area, judge that whether current area is for forbidding community according to the system message of this BCCH frequency, if not, then according to the system message of this BCCH frequency, described terminal judges whether current area supports urgent call, if support, then described terminal judges whether the C1 parameter value of current area is greater than 0 further, if so, then terminal is on the current cell resident, thus realizes the normal initiation of urgent call.It is hereby ensured that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.
Refer to Fig. 2, Fig. 2 is the schematic flow sheet of the another kind of cell selecting method that the embodiment of the present invention provides.As shown in Figure 2, this cell selecting method can include but not limited to following steps.
S201, terminal locate the public land mobile network PLMN in the region of described terminal after powering.
S203, described terminal select the target P LMN in described PLMN to described Terminal for service.
S205, described terminal lock each frequency in described target P LMN successively according to the order that signal strength signal intensity is descending, the frequency correction channel of the target frequency of search Current lock.
Whether target frequency described in S207, described terminal judges is BCCH frequency, if so, performs step S209; If not, step S205 is returned.
S209, described terminal are come synchronous with described BCCH frequency by synchronous channel SCH.
S211, described terminal read the system message on the BCCH channel of broadcast control frequency of current area.
According to the system message on the described BCCH frequency read, S213, described terminal judge that whether described current area is for forbidding community, if not, perform step S215; If so, step S205 is returned.
According to the system message on described BCCH frequency, S215, described terminal judge whether described current area supports urgent call, if so, perform step S217; If not, step S205 is returned.
According to the system message on described BCCH frequency, S217, described terminal judge whether the path loss principle parameter C1 of described current area is greater than 0, if so, perform step S219; If not, step S205 is returned.
S219, described terminal reside in described current area.
In the embodiment of the present invention, all PLMN (PublicLandMobileNetwork in the region at terminal place described in terminal positioning, public land mobile network), in all PLMN PLMN is selected to be described Terminal for service as described target P LMN, all frequencies of all frequency ranges that terminal described in described terminal scanning is supported, and according to the signal strength signal intensity of each frequency is descending, all frequencies are sorted, then, first described terminal adjusts frequency on the highest frequency of signal strength signal intensity, search for the FCCH (FrequencyCorrectionChannel on this frequency, frequency correction channel) judge whether this frequency is BCCH frequency, if, then described terminal is by decoding SCH (SynchronizationChannel, synchronizing channel) next synchronous with this BCCH frequency, after synchronous success, described terminal reads the system message on this BCCH frequency, judge that whether current area corresponding to this BCCH frequency is non-ly forbid community according to the system message read, whether support urgent call, whether the path loss criterion C1 of community is greater than 0, if above three conditions are all satisfied, terminal just can be resident to this community, otherwise described terminal will reselect from secondary strong frequency, by time strong frequency as described target frequency, repeat above flow process.
Visible, in the method described by Fig. 2, perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH frequency of current area, judge that whether current area is for forbidding community according to the system message of this BCCH frequency, if not, then according to the system message of this BCCH frequency, described terminal judges whether current area supports urgent call, if support, then described terminal judges whether the C1 parameter value of current area is greater than 0 further, if so, then terminal is on the current cell resident, thus realizes the normal initiation of urgent call.It is hereby ensured that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.
The above-mentioned method illustrating the embodiment of the present invention, below for the ease of implementing the such scheme of the embodiment of the present invention better, correspondingly, is also provided for coordinating the associated terminal implementing such scheme below.
Refer to Fig. 3, Fig. 3 is the structural representation of a kind of terminal that the embodiment of the present invention provides.As shown in Figure 3, this terminal 30 comprises: the first reading unit 301, first judging unit 303, second judging unit 305, the 3rd judging unit 307 and resident element 309, wherein,
First reading unit 301, for performing in the process of community selection after terminal 30 is started shooting, reads the system message on the BCCH channel of broadcast control frequency of current area;
According to the system message on the described BCCH frequency read, first judging unit 303, for judging that whether described current area is for forbidding community;
According to the system message on described BCCH frequency, second judging unit 305, if judge that described current area is non-ly forbid community for described first judging unit 303, then judges whether described current area supports urgent call;
According to the system message on described BCCH frequency, 3rd judging unit 307, if judge that urgent call is supported in described current area for described second judging unit 305, then judges whether the path loss principle parameter C1 of described current area is greater than 0;
Resident element 309, if judge that the C1 of described current area is greater than 0 for described 3rd judging unit 307, then resides in described current area.
As the optional execution mode of one, described first judging unit 303 specifically for:
Forbid that access identifier judges that whether described current area is for forbidding community according to the system message 3 on described BCCH frequency and/or the community in system message 4;
Described second judging unit 305 specifically for:
If described first judging unit 303 judges that described current area is non-ly forbid community, then judge whether described current area supports urgent call according to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4.
Will be understood that, the function of each functional unit of the terminal 30 of the present embodiment according to the method specific implementation of above-mentioned Fig. 1 embodiment of the method, can repeat no more herein.
Please also refer to the structural representation that Fig. 4, Fig. 4 are the another kind of terminals that the embodiment of the present invention provides.Wherein, the terminal 30 shown in Fig. 4 is that terminal 30 is as shown in Figure 3 optimized and obtains.Compared with Fig. 3, terminal 30 described by Fig. 4 comprises outside the first reading unit 301, first judging unit 303, second judging unit 305, the 3rd judging unit 307 and resident element 309, also comprise: determining unit 311, selected cell 313, search unit 315, the 4th judging unit 317 and lock unit 319, wherein
Determining unit 311, for locating the public land mobile network PLMN in the region of described terminal 30 after terminal 30 is started shooting;
Selected cell 313, provides service for selecting the target P LMN in described PLMN to described terminal 30;
Search unit 315, locks each frequency in described target P LMN successively for the order descending according to signal strength signal intensity, the frequency correction channel of the target frequency of search Current lock;
4th judging unit 317, for judging whether described target frequency is BCCH frequency;
Lock unit 319, if judge that described target frequency is BCCH frequency for described 4th judging unit 317, then comes synchronous with described BCCH frequency by synchronous channel SCH.
Will be understood that, the function of each functional unit of the terminal 30 of the present embodiment according to the method specific implementation of above-mentioned Fig. 2 embodiment of the method, can repeat no more herein.
Referring to Fig. 5, is the structural representation of another kind of terminal provided by the invention.Wherein, as shown in Figure 5, terminal 50 can comprise: input/output module (comprising audio frequency input/output module 515, keyboard input module 517 and display 519 etc.), user interface 501, mobile processor 503, reflector 505, receiver 507, coupler 509, antenna 511 and memory 513.In some embodiments of the invention, these parts are connected, wherein, to be connected by bus in Fig. 5 by bus or alternate manner.Wherein:
Electromagnetic wave in free space for the electromagnetic energy in transmission line being converted to the electromagnetic wave in free space, or is converted to the electromagnetic energy in transmission line by antenna 511; Coupler 509, for mobile communication number is divided into multichannel, distributes to multiple receivers 507.
Reflector 505 carries out transmitting process (such as modulating) for the mobile communication signal generated mobile processor 503, receiver 507 carries out reception process (such as demodulation) for the mobile communication signal received antenna 511, and the two can regard a radio modem as.In specific implementation, the quantity of reflector 505 or receiver 507 can be one or more.
Described input/output module is mainly used in realizing the interactive function between terminal 50 and user/external environment condition, mainly comprises audio frequency input/output module 515, keyboard input module 517 and display 519 etc.In specific implementation, described input/output module also can comprise: camera, touch-screen and transducer etc.Wherein, described input/output module is all communicated with mobile processor 503 by user interface 501.
Memory 513 is coupled with mobile processor 503, for storing various software program and/or organizing instruction more.In specific implementation, memory 513 can comprise the memory of high random access, and also can comprise nonvolatile memory, such as one or more disk storage device, flash memory device or other non-volatile solid-state memory devices.Mobile processor 503 is mainly used in calling the cell selection procedure being stored in and storing in memory 513, and performs following operation:
Perform after terminal 50 is started shooting in the process selected community, utilize receiver 507 to read system message on the BCCH channel of broadcast control frequency of current area;
Judge that whether described current area is for forbidding community according to the system message on the described BCCH frequency read;
If not, then judge whether described current area supports urgent call according to the system message on described BCCH frequency;
If support, then judge whether the path loss principle parameter C1 of described current area is greater than 0 according to the system message on described BCCH frequency;
If be greater than, then reside in described current area.
Further, processor 501 performs and judges that whether described current area is for forbidding community, comprising according to the system message on the described BCCH frequency read:
Forbid that access identifier judges that whether described current area is for forbidding community according to the system message 3 on described BCCH frequency and/or the community in system message 4;
Processor 501 performs and judges whether described current area supports urgent call, comprising according to the system message on described BCCH frequency:
Judge whether described current area supports urgent call according to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4.
Further, processor 501 also performs before performing the system message on the BCCH channel of broadcast control frequency reading current area:
The public land mobile network PLMN in the region of described terminal 50 is located after terminal 50 is started shooting;
The target P LMN in described PLMN is selected to provide service to described terminal 50;
Each frequency in described target P LMN is locked successively, the frequency correction channel of the target frequency of search Current lock according to the order that signal strength signal intensity is descending;
Judge whether described target frequency is BCCH frequency;
If so, then come synchronous with described BCCH frequency by synchronous channel SCH.
Further, described terminal 50 does not install Subscriber Identity Module.
Further, described terminal 50 is mobile station MS or user equipment (UE).
Will be understood that, the execution step of processor 501 specifically see the content described in Fig. 1 or Fig. 2 embodiment, can repeat no more herein.
In sum, perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH frequency of current area, judge that whether current area is for forbidding community according to the system message of this BCCH frequency, if not, then according to the system message of this BCCH frequency, described terminal judges whether current area supports urgent call, if support, then described terminal judges whether the C1 parameter value of current area is greater than 0 further, if, then terminal is on the current cell resident, thus realizes the normal initiation of urgent call.It is hereby ensured that terminal is when without card, the resident community to supporting urgent call, ensures that Terminal Emergency Call can normally be initiated.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.
Step in embodiment of the present invention method can be carried out order according to actual needs and be adjusted, merges and delete.
Unit in embodiment of the present invention terminal can carry out merging, divide and deleting according to actual needs.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (10)
1. a cell selecting method, is characterized in that, comprising:
Perform in the process selected community after starting up of terminal, described terminal reads the system message on the BCCH channel of broadcast control frequency of current area;
According to the system message on the described BCCH frequency read, described terminal judges that whether described current area is for forbidding community;
If not, then according to the system message on described BCCH frequency, described terminal judges whether described current area supports urgent call;
If support, then according to the system message on described BCCH frequency, described terminal judges whether the path loss principle parameter C1 of described current area is greater than 0;
If be greater than, then described terminal resides in described current area.
2. method according to claim 1, is characterized in that, according to the system message on the described BCCH frequency read, described terminal judges that whether described current area is for forbidding community, comprising:
According to the system message 3 on described BCCH frequency and/or the community in system message 4, described terminal forbids that access identifier judges that whether described current area is for forbidding community;
According to the system message on described BCCH frequency, described terminal judges whether described current area supports urgent call, comprising:
According to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4, described terminal judges whether described current area supports urgent call.
3. method according to claim 1 and 2, is characterized in that, described terminal also comprises before reading the system message on the BCCH channel of broadcast control frequency of current area:
Described terminal locates the public land mobile network PLMN in the region of described terminal after powering;
Described terminal selects the target P LMN in described PLMN to described Terminal for service;
Described terminal locks each frequency in described target P LMN successively according to the order that signal strength signal intensity is descending, the frequency correction channel of the target frequency of search Current lock;
Whether target frequency described in described terminal judges is BCCH frequency;
If so, then described terminal is come synchronous with described BCCH frequency by synchronous channel SCH.
4. method according to claim 1 and 2, is characterized in that, described terminal does not install Subscriber Identity Module.
5. method according to claim 1 and 2, is characterized in that, described terminal is mobile station MS or user equipment (UE).
6. a terminal, is characterized in that, comprising:
First reading unit, for performing in the process of community selection after starting up of terminal, reads the system message on the BCCH channel of broadcast control frequency of current area;
According to the system message on the described BCCH frequency read, first judging unit, for judging that whether described current area is for forbidding community;
According to the system message on described BCCH frequency, second judging unit, if judge that described current area is non-ly forbid community for described first judging unit, then judges whether described current area supports urgent call;
According to the system message on described BCCH frequency, 3rd judging unit, if judge that urgent call is supported in described current area for described second judging unit, then judges whether the path loss principle parameter C1 of described current area is greater than 0;
Resident element, if judge that the C1 of described current area is greater than 0 for described 3rd judging unit, then resides in described current area.
7. terminal according to claim 6, is characterized in that, described first judging unit specifically for:
Forbid that access identifier judges that whether described current area is for forbidding community according to the system message 3 on described BCCH frequency and/or the community in system message 4;
Described second judging unit specifically for:
Judge whether described current area supports urgent call according to the system message 3 on described BCCH frequency and/or the permission urgent call identifier EC in system message 4.
8. the terminal according to claim 6 or 7, is characterized in that, described terminal also comprises:
Determining unit, for locating the public land mobile network PLMN in the region of described terminal after starting up of terminal;
Selected cell, for selecting the target P LMN in described PLMN to described Terminal for service;
Search unit, locks each frequency in described target P LMN successively for the order descending according to signal strength signal intensity, the frequency correction channel of the target frequency of search Current lock;
4th judging unit, for judging whether described target frequency is BCCH frequency;
Lock unit, if judge that described target frequency is BCCH frequency for described 4th judging unit, then comes synchronous with described BCCH frequency by synchronous channel SCH.
9. the terminal according to claim 6 or 7, is characterized in that, described terminal does not install Subscriber Identity Module.
10. the terminal according to claim 6 or 7, is characterized in that, described terminal is mobile station MS or user equipment (UE).
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| CN201610055410.5A CN105554857A (en) | 2016-01-27 | 2016-01-27 | Cell selection method and terminal |
| PCT/CN2016/074901 WO2017128489A1 (en) | 2016-01-27 | 2016-02-29 | Cell selection method and terminal |
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