WO2017128489A1 - 一种小区选择方法及终端 - Google Patents

一种小区选择方法及终端 Download PDF

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Publication number
WO2017128489A1
WO2017128489A1 PCT/CN2016/074901 CN2016074901W WO2017128489A1 WO 2017128489 A1 WO2017128489 A1 WO 2017128489A1 CN 2016074901 W CN2016074901 W CN 2016074901W WO 2017128489 A1 WO2017128489 A1 WO 2017128489A1
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WIPO (PCT)
Prior art keywords
terminal
frequency point
cell
current cell
system message
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PCT/CN2016/074901
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English (en)
French (fr)
Inventor
张祖辉
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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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
    • 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]
    • 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
    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a cell selection method and a terminal.
  • the terminal After the terminal is powered on, it will first find the network and get in touch with the network to get the services of the network.
  • the terminal selects a BCCH (Broadcast Control Channel) cell with the best signal strength that satisfies the cell selection criterion to camp, if the cell in which the terminal resides does not support the emergency call.
  • BCCH Broadcast Control Channel
  • the service will cause the cardless terminal to fail to initiate an emergency call in the cell, thereby affecting the normal use of the user and causing unnecessary loss to the user.
  • the embodiment of the invention provides a cell selection method and a terminal, which can ensure that the terminal camps on a cell supporting an emergency call without a card, and ensures that the terminal emergency call can be initiated normally.
  • an embodiment of the present invention provides a cell selection method, including:
  • the terminal During the process of performing cell selection after the terminal is powered on, the terminal reads a system message on a broadcast control channel BCCH frequency point of the current cell;
  • the terminal determines, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell
  • the terminal determines, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call
  • the terminal determines, according to the system message on the BCCH frequency, whether the path loss principle parameter C1 of the current cell is greater than 0;
  • the terminal resides in the current cell.
  • the terminal is Obtaining, by the system message on the BCCH frequency point, whether the current cell is a forbidden cell, including:
  • Determining, by the system message according to the BCCH frequency, whether the current cell supports an emergency call including:
  • the terminal determines, according to the system emergency message 3 on the BCCH frequency point and/or the emergency call identifier EC in the system message 4, whether the current cell supports an emergency call.
  • the terminal reads a system message on a broadcast control channel BCCH frequency point of a current cell Previously, it also included:
  • the terminal locates a public land mobile network PLMN in an area of the terminal after being powered on;
  • the terminal selects a target PLMN in the PLMN to provide a service to the terminal;
  • the terminal sequentially locks each frequency point in the target PLMN according to the signal strength from large to small, and searches for a frequency correction channel of the currently locked target frequency point;
  • the terminal synchronizes with the BCCH frequency point through the synchronization channel SCH.
  • the terminal does not have a subscriber identity card installed.
  • the terminal is a mobile station MS or a user equipment UE.
  • an embodiment of the present invention provides a terminal, including:
  • a first reading unit configured to read a system message on a broadcast control channel BCCH frequency point of the current cell in a process of performing cell selection after the terminal is powered on;
  • a first determining unit configured to determine, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell
  • a second determining unit configured to determine, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, if the first determining unit determines that the current cell is a non-forbidden cell;
  • a third determining unit configured to determine, according to the system message on the BCCH frequency point, whether the path loss principle parameter C1 of the current cell is greater than 0, if the second determining unit determines that the current cell supports an emergency call;
  • a camping unit configured to reside in the current cell if the third determining unit determines that C1 of the current cell is greater than 0.
  • the first determining unit is specifically configured to:
  • the second determining unit is specifically configured to:
  • Whether the current cell supports an emergency call is determined according to the system emergency message number 3 on the BCCH frequency and/or the emergency call identifier EC in the system message 4.
  • the terminal further includes:
  • a determining unit configured to locate a public land mobile network PLMN in an area of the terminal after the terminal is powered on;
  • a selecting unit configured to select a target PLMN in the PLMN to provide a service to the terminal
  • a search unit configured to sequentially lock each frequency point in the target PLMN in order of increasing signal strength, and search for a frequency correction channel of the currently locked target frequency point;
  • a fourth determining unit configured to determine whether the target frequency point is a BCCH frequency point
  • a synchronization unit configured to: if the fourth determining unit determines that the target frequency point is a BCCH frequency point, synchronize with the BCCH frequency point by using a synchronization channel SCH.
  • the terminal does not have a subscriber identity card installed.
  • the terminal is a mobile station MS or a user equipment UE.
  • the terminal In the process of performing the cell selection after the terminal is powered on, the terminal reads the system message on the BCCH frequency point of the current cell, and determines whether the current cell is a forbidden cell according to the system message of the BCCH frequency point. No, the terminal according to the BCCH frequency system message The terminal determines whether the current cell supports the emergency call. If yes, the terminal further determines whether the C1 parameter value of the current cell is greater than 0. If yes, the terminal resides on the current cell, thereby implementing normal initiation of the emergency call. Therefore, it can be ensured that the terminal camps on the cell supporting the emergency call without the card, and ensures that the emergency call of the terminal can be initiated normally.
  • FIG. 1 is a schematic flowchart of a cell selection method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of another cell selection method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • the terminals described in the following embodiments include, but are not limited to, a mobile station (Mobile Station, MS) in the 2G network, and a user equipment (User Equipment, UE) in the 3G and 4G networks, which may include, but are not limited to, a mobile phone (eg, Android phones, iOS phones, etc.), tablets, personal digital assistants (PDAs), smart wearable devices (smart watches, etc.) or other mobile terminal devices with communication functions.
  • a mobile phone eg, Android phones, iOS phones, etc.
  • PDAs personal digital assistants
  • smart wearable devices smart watch, etc.
  • the embodiment of the invention provides a cell selection method and a terminal, which can ensure that the terminal camps on a cell supporting an emergency call without a card, and ensures that the terminal emergency call can be initiated normally. The details are described below separately.
  • FIG. 1 is a schematic flowchart of a cell selection method according to an embodiment of the present invention. As shown in FIG. 1, the cell selection method is applied to a terminal, and the method may include, but is not limited to, the following steps.
  • the terminal reads a system message on a broadcast control channel BCCH frequency point of the current cell.
  • step S103 The terminal determines, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell. If not, step S105 is performed; if yes, the process returns to step S101.
  • the terminal determines, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, and if yes, performs step S107; if not, returns to step S101.
  • step S107 The terminal determines, according to the system message on the BCCH frequency point, whether the path loss principle parameter C1 of the current cell is greater than 0. If yes, step S109 is performed; if no, return to step S101.
  • the terminal resides in the current cell.
  • the terminal performs a cell selection process after the power is turned on, the terminal reads the system message on the BCCH frequency point of the current cell, and determines whether the current cell is a forbidden cell according to the system message on the BCCH frequency point. If not, the terminal further determines, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, and if yes, the terminal further determines, according to the system message on the BCCH frequency point, the current cell.
  • the path loss principle parameter C1 is greater than 0. If it is greater than, the current cell is a suitable cell, and the terminal camps on the current cell, otherwise the terminal will reselect another cell as the current cell. Repeat the above process.
  • the terminal is a terminal that does not have a user identification card, and the user identification card includes, but is not limited to, a USIM (Universal Subscriber Identity Module) card and a SIM (Subscriber Identity Module, SIM) card.
  • a parameter is defined as the path loss principle C1.
  • A RXLEV - RXLEV_ACCESS_MIN (dBm)
  • B MS_TXPWR_MAX_CCH-P (dBm)
  • RXLEV average level received by the terminal
  • P maximum output power level that the mobile station (MS) can provide
  • RXLEV_ACCESS_MIN minimum receiving level required by the MS to access the system
  • MS_TXPWR_MAX_CCH the maximum transmit power level that the MS can use when accessing the system.
  • C1 is calculated by each terminal, which defines the coverage area of each cell. Outside the cell, C1 is Negative; it determines the boundary between two neighboring cells in the standby state, and the parameters for calculating C1 are broadcast by the network in the system message.
  • the terminal determines, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell, including:
  • the terminal determines whether the current cell is a forbidden cell according to the cell-disabled access identifier in the system message 3 and/or the system message 4 on the BCCH frequency point.
  • Determining, by the system message according to the BCCH frequency, whether the current cell supports an emergency call including:
  • the terminal determines, according to the system emergency message 3 on the BCCH frequency point and/or the emergency call identifier EC in the system message 4, whether the current cell supports an emergency call.
  • the terminal reads the system message type 3 on the BCCH frequency of the current cell, or the system message type 4, and the system message type 3 or the system message type 4 includes a RACH (Random Access Channel) control message.
  • the RACH control message includes a parameter CELL BAR ACCESS, and the terminal determines whether the current cell is a forbidden cell according to the identifier of CELL BAR ACCESS. If the identifier of CELL BAR ACCESS is notBarred, then The current cell is a non-forbidden cell. If the identifier of the CELL BAR ACCESS is Barred, the current cell is a forbidden cell, and the RACH control message further includes an emergency call allowed (EC). Whether the terminal is allowed to initiate an emergency call identifier), if the EC identifier is 0, it indicates that the current cell supports an emergency call, and if the EC identifier is 1, it indicates that the current cell does not support an emergency call.
  • EC emergency call allowed
  • the terminal in the process of performing cell selection after the terminal is powered on, the terminal reads a system message on a BCCH frequency point of the current cell, and determines, according to the system message of the BCCH frequency point, whether the current cell is The cell is forbidden. If not, the terminal determines whether the current cell supports the emergency call according to the system message of the BCCH frequency. If supported, the terminal further determines whether the C1 parameter value of the current cell is greater than 0. If yes, the terminal station Stay on the current cell to enable normal initiation of emergency calls. Therefore, it can be ensured that the terminal camps on the cell supporting the emergency call without the card, and ensures that the emergency call of the terminal can be initiated normally.
  • FIG. 2 is a schematic flowchart diagram of another cell selection method according to an embodiment of the present invention. As shown in FIG. 2, the cell selection method may include, but is not limited to, the following steps.
  • the terminal locates a public land mobile network PLMN in an area of the terminal after being powered on.
  • the terminal selects a target PLMN in the PLMN to provide a service to the terminal.
  • the terminal sequentially locks each frequency point in the target PLMN according to a signal strength from large to small, and searches for a frequency correction channel of the currently locked target frequency point.
  • step S207 The terminal determines whether the target frequency point is a BCCH frequency point. If yes, step S209 is performed; if no, the process returns to step S205.
  • the terminal synchronizes with the BCCH frequency point by using a synchronization channel SCH.
  • the terminal reads a system message on a broadcast control channel BCCH frequency point of the current cell.
  • step S213. The terminal determines, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell. If not, step S215 is performed; if yes, the process returns to step S205.
  • the terminal determines, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, and if yes, performs step S217; if not, returns to step S205.
  • step S217 The terminal determines, according to the system message on the BCCH frequency, whether the path loss principle parameter C1 of the current cell is greater than 0. If yes, step S219 is performed; if no, return to step S205.
  • the terminal resides in the current cell.
  • the terminal locates all PLMNs (Public Land Mobile Networks) in the area where the terminal is located, and selects one of all PLMNs as the target PLMN to provide services for the terminal.
  • the terminal scans all frequency points of all frequency bands supported by the terminal, and sorts all frequency points according to the signal strength of each frequency point, and then the terminal first adjusts the frequency to the frequency point with the highest signal strength.
  • Searching for the FCCH (Frequency Correction Channel) on the frequency point to determine whether the frequency point is a BCCH frequency point, and if so, the terminal synchronizes with the BCCH frequency point by decoding a SCH (Synchronization Channel).
  • FCCH Frequency Correction Channel
  • the terminal After the synchronization succeeds, the terminal reads the system message on the BCCH frequency point, and determines whether the current cell corresponding to the BCCH frequency point is a non-forbidden cell according to the read system message, whether the emergency call is supported, and the path loss of the cell Whether the criterion C1 is greater than 0, if the above three conditions are satisfied, the terminal can camp on the cell, otherwise the terminal Reselection from the second strongest frequency, the second strongest frequency as the target frequency, the above process is repeated.
  • the terminal in the process of performing cell selection after the terminal is powered on, the terminal reads the system message on the BCCH frequency point of the current cell, and the system cancels according to the BCCH frequency point. Determine whether the current cell is a forbidden cell, and if not, the terminal determines whether the current cell supports an emergency call according to the system message of the BCCH frequency point. If supported, the terminal further determines whether the current cell C1 parameter value is greater than 0. If yes, the terminal resides on the current cell, so as to implement the normal initiation of the emergency call. Therefore, it can be ensured that the terminal camps on the cell supporting the emergency call without the card, and ensures that the emergency call of the terminal can be initiated normally.
  • FIG. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the terminal 30 includes: a first reading unit 301, a first determining unit 303, a second determining unit 305, a third determining unit 307, and a camping unit 309, where
  • the first reading unit 301 is configured to read a system message on a broadcast control channel BCCH frequency point of the current cell in the process of performing cell selection after the terminal 30 is powered on;
  • the first determining unit 303 is configured to determine, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell;
  • the second determining unit 305 is configured to determine, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, if the first determining unit 303 determines that the current cell is a non-forbidden cell;
  • the third determining unit 307 is configured to determine, according to the system message on the BCCH frequency point, whether the parameter C1 of the path loss principle of the current cell is greater than if the second determining unit 305 determines that the current cell supports an emergency call. 0;
  • the camping unit 309 is configured to reside in the current cell if the third determining unit 307 determines that the C1 of the current cell is greater than 0.
  • the first determining unit 303 is specifically configured to:
  • the second determining unit 305 is specifically configured to:
  • the first determining unit 303 determines that the current cell is a non-forbidden cell, it is determined according to the allowed emergency call identifier EC in the system message 3 and/or the system message 4 on the BCCH frequency point. Whether the current cell supports an emergency call.
  • FIG. 4 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • the terminal 30 shown in FIG. 4 is optimized by the terminal 30 shown in FIG. Compared with FIG. 3, the terminal 30 described in FIG. 4 includes a first reading unit 301, a first determining unit 303, a second determining unit 305, a third determining unit 307, and a camping unit 309, and further includes: determining unit 311, a selection unit 313, a search unit 315, a fourth determination unit 317, and a synchronization unit 319, wherein
  • a determining unit 311, configured to locate a public land mobile network PLMN in an area of the terminal 30 after the terminal 30 is powered on;
  • a selecting unit 313, configured to select a target PLMN in the PLMN to provide a service to the terminal 30;
  • the searching unit 315 is configured to sequentially lock each frequency point in the target PLMN according to the signal strength from large to small, and search for a frequency correction channel of the currently locked target frequency point;
  • the fourth determining unit 317 is configured to determine whether the target frequency point is a BCCH frequency point
  • the synchronization unit 319 is configured to synchronize with the BCCH frequency point through the synchronization channel SCH if the fourth determination unit 317 determines that the target frequency point is a BCCH frequency point.
  • the terminal 50 may include: an input and output module (including an audio input and output module 515, a key input module 517, and a display 519, etc.), a user interface 501, a mobile processor 503, a transmitter 505, and a receiver 507. , a coupler 509, an antenna 511, and a memory 513.
  • these components may be connected by a bus or other means, wherein FIG. 5 is exemplified by a bus connection. among them:
  • the antenna 511 is used to convert electromagnetic energy in the transmission line into electromagnetic waves in free space, or to convert electromagnetic waves in free space into electromagnetic energy in the transmission line;
  • the coupler 509 is used to divide the mobile signal into multiple channels and distribute it to multiple Receiver 507.
  • the transmitter 505 is configured to perform a transmission process (eg, modulation) on the mobile communication signal generated by the mobile processor 503, and the receiver 507 is configured to perform a reception process (eg, demodulation) on the mobile communication signal received by the antenna 511, which can be regarded as A wireless modem.
  • the number of the transmitter 505 or the receiver 507 may be one or more.
  • the input and output module is mainly used to implement the interaction function between the terminal 50 and the user/external environment, and mainly includes an audio input and output module 515, a key input module 517, a display 519, and the like.
  • the input and output module may further include: a camera, a touch screen, a sensor, and the like.
  • the input and output modules communicate with the mobile processor 503 through the user interface 501.
  • Memory 513 is coupled to mobile processor 503 for storing various software programs and/or sets of instructions.
  • memory 513 can include high speed random access memory, and can also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices.
  • the mobile processor 503 is mainly used to call a cell selection program stored in the memory 513, and performs the following operations:
  • the receiver 507 is used to read the system message on the broadcast control channel BCCH frequency point of the current cell;
  • the processor 501 performs, according to the read system message on the BCCH frequency point, whether the current cell is a forbidden cell, including:
  • the processor 501 performs, according to the system message on the BCCH frequency point, whether the current cell supports an emergency call, including:
  • Allow emergency calls in system message 3 and/or system message 4 on the BCCH frequency The identifier EC determines whether the current cell supports an emergency call.
  • the processor 501 before the processor 501 performs reading the system message on the broadcast control channel BCCH frequency point of the current cell, the processor 501 further performs:
  • Each frequency point in the target PLMN is sequentially locked in order of increasing signal strength, and the frequency correction channel of the currently locked target frequency point is searched;
  • the BCCH frequency is synchronized by the synchronization channel SCH.
  • the terminal 50 does not have a subscriber identity card installed.
  • the terminal 50 is a mobile station MS or a user equipment UE.
  • the terminal in the process of performing cell selection after the terminal is powered on, the terminal reads the system message on the BCCH frequency point of the current cell, and determines whether the current cell is a forbidden cell according to the system message of the BCCH frequency point, and if not, The terminal determines whether the current cell supports the emergency call according to the system message of the BCCH frequency point. If yes, the terminal further determines whether the C1 parameter value of the current cell is greater than 0. If yes, the terminal resides on the current cell. Thereby achieving the normal initiation of an emergency call. Therefore, it can be ensured that the terminal camps on the cell supporting the emergency call without the card, and ensures that the emergency call of the terminal can be initiated normally.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • the units in the terminal in the embodiment of the present invention may be combined, divided, and deleted according to actual needs.

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Abstract

本发明实施例提供了一种小区选择方法及终端。其中，该方法包括：在终端开机后执行小区选择的过程中，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息；所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；若否，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；若支持，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；若大于，则所述终端驻留在所述当前小区。通过本发明实施例，可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。

Description

一种小区选择方法及终端
本申请要求于2016年1月27日提交中国专利局，申请号为201610055410.5、发明名称为“一种小区选择方法及终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，具体涉及一种小区选择方法及终端。
背景技术
终端开机后，首先会找到网络并和网络取得联系，以获得网络的服务。现有技术中，当终端无卡的时候，终端会选择满足小区选择准则的信号强度最好的BCCH(Broadcast Control Channel，广播控制信道)小区进行驻留，若终端驻留的小区不支持紧急呼叫业务，则会导致无卡终端无法在该小区发起紧急呼叫，从而影响用户的正常使用，给用户造成不必要的损失。
发明内容
本发明实施例提供了一种小区选择方法及终端，可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。
第一方面，本发明实施例提供了一种小区选择方法，包括：
在终端开机后执行小区选择的过程中，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息；
所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
若否，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
若支持，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
若大于，则所述终端驻留在所述当前小区。
结合第一方面，在第一方面的第一种可能的实现方式中，所述终端根据读 取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，包括：
所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，包括：
所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断所述当前小区是否支持紧急呼叫。
结合第一方面，或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息之前，还包括：
所述终端在开机后定位所述终端的区域中的公共陆地移动网络PLMN；
所述终端选择所述PLMN中的目标PLMN给所述终端提供服务；
所述终端按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
所述终端判断所述目标频点是否为BCCH频点；
若是，则所述终端通过同步信道SCH来与所述BCCH频点同步。
结合第一方面，或第一方面的第一种可能的实现方式，在第一方面的第三种可能的实现方式中，所述终端未安装用户识别卡。
结合第一方面，或第一方面的第一种可能的实现方式，在第一方面的第四种可能的实现方式中，所述终端为移动台MS或用户设备UE。
第二方面，本发明实施例提供了一种终端，包括：
第一读取单元，用于在终端开机后执行小区选择的过程中，读取当前小区的广播控制信道BCCH频点上的系统消息；
第一判断单元，用于根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
第二判断单元，用于若所述第一判断单元判断出所述当前小区为非禁止小区，则根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
第三判断单元，用于若所述第二判断单元判断出所述当前小区支持紧急呼叫，则根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
驻留单元，用于若所述第三判断单元判断出所述当前小区的C1大于0，则驻留在所述当前小区。
结合第二方面，在第二方面的第一种可能的实现方式中，所述第一判断单元具体用于：
根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
所述第二判断单元具体用于：
根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断所述当前小区是否支持紧急呼叫。
结合第二方面，或第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述终端还包括：
确定单元，用于在终端开机后定位所述终端的区域中的公共陆地移动网络PLMN；
选择单元，用于选择所述PLMN中的目标PLMN给所述终端提供服务；
搜索单元，用于按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
第四判断单元，用于判断所述目标频点是否为BCCH频点；
同步单元，用于若所述第四判断单元判断出所述目标频点为BCCH频点，则通过同步信道SCH来与所述BCCH频点同步。
结合第二方面，或第二方面的第一种可能的实现方式，在第二方面的第三种可能的实现方式中，所述终端未安装用户识别卡。
结合第二方面，或第二方面的第一种可能的实现方式，在第二方面的第四种可能的实现方式中，所述终端为移动台MS或用户设备UE。
通过实施本发明实施例，终端开机后执行小区选择的过程中，所述终端读取当前小区的BCCH频点上的系统消息，根据该BCCH频点的系统消息判断当前小区是否为禁止小区，若否，则所述终端根据该BCCH频点的系统消息 判断当前小区是否支持紧急呼叫，若支持，则所述终端进一步判断当前小区的C1参数值是否大于0，若是，则终端驻留在当前小区上，从而实现紧急呼叫的正常发起。因此可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的一种小区选择方法的流程示意图；
图2是本发明实施例提供的另一种小区选择方法的流程示意图；
图3是本发明实施例提供的一种终端的结构示意图；
图4是本发明实施例提供的另一种终端的结构示意图；
图5是本发明实施例提供的另一种终端的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
以下各实施例中所描述的终端包括但不限于2G网络中的移动台(Mobile Station，MS)、3G和4G网络中的用户设备(User Equipment，UE)，可包括但不限于：手机(如Android手机、iOS手机等)、平板电脑、个人数字助理(Personal Digital Assistant,PDA)、智能穿戴设备(智能手表等)或其他具备通信功能的移动终端设备。
本发明实施例提供了一种小区选择方法及终端，可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。以下分别进行详细说明。
请参见图1，图1是本发明实施例提供的一种小区选择方法的流程示意图。如图1所示，该小区选择方法应用于终端，该方法可以包括但不限于以下步骤。
S101、在终端开机后执行小区选择的过程中，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息。
S103、所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，若否，执行步骤S105；若是，返回步骤S101。
S105、所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，若是，执行步骤S107；若否，返回步骤S101。
S107、所述终端根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0，若是，执行步骤S109；若否，返回步骤S101。
S109、所述终端驻留在所述当前小区。
本发明实施例中，终端在开机后进行小区选择过程，所述终端读取当前小区的BCCH频点上的系统消息，根据该BCCH频点上的系统消息判断所述当前小区是否为禁止小区，若否，则所述终端进一步根据该BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，若是，则所述终端进一步根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0，若大于，则所述当前小区为合适的小区，所述终端在所述当前小区进行驻留，否则所述终端将重新选择另一个小区作为所述当前小区，重复以上流程。需要说明的是，所述终端为未安装用户识别卡的终端，所述用户识别卡包括但不限于：USIM(Universal Subscriber Identity Module)卡和SIM(Subscriber Identity Module，SIM)卡。
其中，在GSM(Global System for Mobile Communication，全球移动通信系统)规范中规定了一个参数称作路径损耗原则C1，所谓合适的小区必须保证该小区的C1＞0，C1＝(A-Max(B，0))，A＝RXLEV-RXLEV_ACCESS_MIN(dBm)，B＝MS_TXPWR_MAX_CCH-P(dBm)，其中，RXLEV＝终端接收的平均电平，P＝移动台(MS)所能提供的最大输出功率电平，RXLEV_ACCESS_MIN＝MS接入系统所需要的最小接收电平，MS_TXPWR_MAX_CCH＝MS接入系统时可使用的最大发射功率电平。C1是由每个终端计算得到，它定义了每个小区的覆盖区域，在该小区之外，C1为 负；它决定在待机状态下两个相邻小区之间选择的界限，计算C1的参数均由网络在系统消息中广播。
作为一种可选的实施方式，所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，包括：
所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区。
所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，包括：
所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断所述当前小区是否支持紧急呼叫。
具体的，终端读取当前小区的BCCH频点上的系统消息类型3，或系统消息类型4，系统消息类型3或系统消息类型4中均包括RACH(Random Access Channel，随机接入信道)控制消息，RACH控制消息中含有参数CELL BAR ACCESS(小区禁止接入)，所述终端根据CELL BAR ACCESS这一标识符判断所述当前小区是否为禁止小区，若CELL BAR ACCESS这一标识符为notBarred，则表明所述当前小区为非禁止小区，若CELL BAR ACCESS这一标识符为Barred，则表明所述当前小区为禁止小区，RACH控制消息中还包含允许紧急呼叫标识符EC(Emergency Call allowed，网络配置的是否允许终端发起紧急呼叫标识)，若该EC标识符为0，则表明所述当前小区支持紧急呼叫，若该EC标识符为1，则表明所述当前小区不支持紧急呼叫。
可见，在图1所描述的方法中，终端开机后执行小区选择的过程中，所述终端读取当前小区的BCCH频点上的系统消息，根据该BCCH频点的系统消息判断当前小区是否为禁止小区，若否，则所述终端根据该BCCH频点的系统消息判断当前小区是否支持紧急呼叫，若支持，则所述终端进一步判断当前小区的C1参数值是否大于0，若是，则终端驻留在当前小区上，从而实现紧急呼叫的正常发起。因此可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。
请参见图2，图2是本发明实施例提供的另一种小区选择方法的流程示意图。如图2所示，该小区选择方法可以包括但不限于以下步骤。
S201、终端在开机后定位所述终端的区域中的公共陆地移动网络PLMN。
S203、所述终端选择所述PLMN中的目标PLMN给所述终端提供服务。
S205、所述终端按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道。
S207、所述终端判断所述目标频点是否为BCCH频点，若是，执行步骤S209；若否，返回步骤S205。
S209、所述终端通过同步信道SCH来与所述BCCH频点同步。
S211、所述终端读取当前小区的广播控制信道BCCH频点上的系统消息。
S213、所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，若否，执行步骤S215；若是，返回步骤S205。
S215、所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，若是，执行步骤S217；若否，返回步骤S205。
S217、所述终端根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0，若是，执行步骤S219；若否，返回步骤S205。
S219、所述终端驻留在所述当前小区。
本发明实施例中，终端定位所述终端所在的区域中的所有PLMN(Public Land Mobile Network，公共陆地移动网络)，选择所有PLMN中的一个PLMN作为所述目标PLMN为所述终端提供服务，所述终端扫描所述终端支持的所有频段的所有频点，并按照各个频点的信号强度由大到小将所有频点进行排序，然后，所述终端首先调整频率到信号强度最高的频点上，搜索该频点上的FCCH(Frequency Correction Channel，频率校正信道)判断该频点是否是BCCH频点，若是，则所述终端通过解码SCH(Synchronization Channel，同步信道)来与该BCCH频点同步，同步成功后，所述终端读取该BCCH频点上的系统消息，根据读出的系统消息来判断该BCCH频点所对应的当前小区是否为非禁止小区，是否支持紧急呼叫，小区的路径损耗准则C1是否大于0，如果以上三个条件都满足，终端就可以驻留到该小区，否则所述终端将从次强频点重新选择，将次强频点作为所述目标频点，重复以上流程。
可见，在图2所描述的方法中，终端开机后执行小区选择的过程中，所述终端读取当前小区的BCCH频点上的系统消息，根据该BCCH频点的系统消 息判断当前小区是否为禁止小区，若否，则所述终端根据该BCCH频点的系统消息判断当前小区是否支持紧急呼叫，若支持，则所述终端进一步判断当前小区的C1参数值是否大于0，若是，则终端驻留在当前小区上，从而实现紧急呼叫的正常发起。因此可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。
上述详细阐述了本发明实施例的方法，下面为了便于更好地实施本发明实施例的上述方案，相应地，下面还提供用于配合实施上述方案的相关终端。
请参见图3，图3是本发明实施例提供的一种终端的结构示意图。如图3所示，该终端30包括：第一读取单元301、第一判断单元303、第二判断单元305、第三判断单元307和驻留单元309，其中，
第一读取单元301，用于在终端30开机后执行小区选择的过程中，读取当前小区的广播控制信道BCCH频点上的系统消息；
第一判断单元303，用于根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
第二判断单元305，用于若所述第一判断单元303判断出所述当前小区为非禁止小区，则根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
第三判断单元307，用于若所述第二判断单元305判断出所述当前小区支持紧急呼叫，则根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
驻留单元309，用于若所述第三判断单元307判断出所述当前小区的C1大于0，则驻留在所述当前小区。
作为一种可选的实施方式，所述第一判断单元303具体用于：
根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
所述第二判断单元305具体用于：
若所述第一判断单元303判断出所述当前小区为非禁止小区，则根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断 所述当前小区是否支持紧急呼叫。
可理解的是，本实施例的终端30的各功能单元的功能可根据上述图1方法实施例的方法具体实现，此处不再赘述。
请一并参见图4，图4是本发明实施例提供的另一种终端的结构示意图。其中，图4所示的终端30是由图3所示的终端30进行优化得到的。与图3相比，图4所描述的终端30包括第一读取单元301、第一判断单元303、第二判断单元305、第三判断单元307和驻留单元309外，还包括：确定单元311、选择单元313、搜索单元315、第四判断单元317和同步单元319，其中，
确定单元311，用于在终端30开机后定位所述终端30的区域中的公共陆地移动网络PLMN；
选择单元313，用于选择所述PLMN中的目标PLMN给所述终端30提供服务；
搜索单元315，用于按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
第四判断单元317，用于判断所述目标频点是否为BCCH频点；
同步单元319，用于若所述第四判断单元317判断出所述目标频点为BCCH频点，则通过同步信道SCH来与所述BCCH频点同步。
可理解的是，本实施例的终端30的各功能单元的功能可根据上述图2方法实施例的方法具体实现，此处不再赘述。
请参见图5，是本发明提供的另一种终端的结构示意图。其中，如图5所示，终端50可包括：输入输出模块(包括音频输入输出模块515、按键输入模块517以及显示器519等)、用户接口501、移动处理器503、发射器505、接收器507、耦合器509、天线511以及存储器513。在本发明的一些实施例中，这些部件可通过总线或者其它方式连接，其中，图5中以通过总线连接为例。其中：
天线511用于将传输线中的电磁能转换成自由空间中的电磁波，或者将自由空间中的电磁波转换成传输线中的电磁能；耦合器509用于将移动通信号分成多路，分配给多个的接收器507。
发射器505用于对移动处理器503生成的移动通信信号进行发射处理(例如调制)，接收器507用于对天线511接收的移动通信信号进行接收处理(例如解调)，二者可看作一个无线调制解调器。具体实现中，发射器505或接收器507的数量可以是一个或多个。
所述输入输出模块主要用于实现终端50和用户/外部环境之间的交互功能，主要包括音频输入输出模块515、按键输入模块517以及显示器519等。具体实现中，所述输入输出模块还可包括：摄像头、触摸屏以及传感器等等。其中，所述输入输出模块均通过用户接口501与移动处理器503进行通信。
存储器513与移动处理器503耦合，用于存储各种软件程序和/或多组指令。具体实现中，存储器513可包括高速随机存取的存储器，并且也可包括非易失性存储器，例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。移动处理器503主要用于调用存储于存储器513中存储的小区选择程序，并执行以下操作：
在终端50开机后执行小区选择的过程中，利用接收器507读取当前小区的广播控制信道BCCH频点上的系统消息；
根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
若否，则根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
若支持，则根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
若大于，则驻留在所述当前小区。
进一步地，处理器501执行根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，包括：
根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
处理器501执行根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，包括：
根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫 标识符EC判断所述当前小区是否支持紧急呼叫。
更进一步地，处理器501执行读取当前小区的广播控制信道BCCH频点上的系统消息之前，还执行：
在终端50开机后定位所述终端50的区域中的公共陆地移动网络PLMN；
选择所述PLMN中的目标PLMN给所述终端50提供服务；
按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
判断所述目标频点是否为BCCH频点；
若是，则通过同步信道SCH来与所述BCCH频点同步。
更进一步地，所述终端50未安装用户识别卡。
更进一步地，所述终端50为移动台MS或用户设备UE。
可理解的是，处理器501的执行步骤具体可参见图1或图2实施例所述的内容，此处不再赘述。
综上所述，终端开机后执行小区选择的过程中，所述终端读取当前小区的BCCH频点上的系统消息，根据该BCCH频点的系统消息判断当前小区是否为禁止小区，若否，则所述终端根据该BCCH频点的系统消息判断当前小区是否支持紧急呼叫，若支持，则所述终端进一步判断当前小区的C1参数值是否大于0，若是，则终端驻留在当前小区上，从而实现紧急呼叫的正常发起。因此可以确保终端在无卡的情况下，驻留到支持紧急呼叫的小区，保障终端紧急呼叫能够正常发起。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本发明实施例终端中的单元可以根据实际需要进行合并、划分和删减。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种小区选择方法，其特征在于，包括：
    在终端开机后执行小区选择的过程中，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息；
    所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
    若否，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
    若支持，则所述终端根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
    若大于，则所述终端驻留在所述当前小区。
  2. 根据权利要求1所述的方法，其特征在于，所述终端根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区，包括：
    所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
    所述终端根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫，包括：
    所述终端根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断所述当前小区是否支持紧急呼叫。
  3. 根据权利要求1或2所述的方法，其特征在于，所述终端读取当前小区的广播控制信道BCCH频点上的系统消息之前，还包括：
    所述终端在开机后定位所述终端的区域中的公共陆地移动网络PLMN；
    所述终端选择所述PLMN中的目标PLMN给所述终端提供服务；
    所述终端按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
    所述终端判断所述目标频点是否为BCCH频点；
    若是，则所述终端通过同步信道SCH来与所述BCCH频点同步。
  4. 根据权利要求1或2所述的方法，其特征在于，所述终端未安装用户识别卡。
  5. 根据权利要求1或2所述的方法，其特征在于，所述终端为移动台MS或用户设备UE。
  6. 一种终端，其特征在于，包括：
    第一读取单元，用于在终端开机后执行小区选择的过程中，读取当前小区的广播控制信道BCCH频点上的系统消息；
    第一判断单元，用于根据读取到的所述BCCH频点上的系统消息判断所述当前小区是否为禁止小区；
    第二判断单元，用于若所述第一判断单元判断出所述当前小区为非禁止小区，则根据所述BCCH频点上的系统消息判断所述当前小区是否支持紧急呼叫；
    第三判断单元，用于若所述第二判断单元判断出所述当前小区支持紧急呼叫，则根据所述BCCH频点上的系统消息判断所述当前小区的路径损耗原则参数C1是否大于0；
    驻留单元，用于若所述第三判断单元判断出所述当前小区的C1大于0，则驻留在所述当前小区。
  7. 根据权利要求6所述的终端，其特征在于，所述第一判断单元具体用于：
    根据所述BCCH频点上的系统消息3和/或系统消息4中的小区禁止接入标识符判断所述当前小区是否为禁止小区；
    所述第二判断单元具体用于：
    根据所述BCCH频点上的系统消息3和/或系统消息4中的允许紧急呼叫标识符EC判断所述当前小区是否支持紧急呼叫。
  8. 根据权利要求6或7所述的终端，其特征在于，所述终端还包括：
    确定单元，用于在终端开机后定位所述终端的区域中的公共陆地移动网络PLMN；
    选择单元，用于选择所述PLMN中的目标PLMN给所述终端提供服务；
    搜索单元，用于按照信号强度由大到小的顺序依次锁定所述目标PLMN中的每一个频点，搜索当前锁定的目标频点的频率校正信道；
    第四判断单元，用于判断所述目标频点是否为BCCH频点；
    同步单元，用于若所述第四判断单元判断出所述目标频点为BCCH频点，则通过同步信道SCH来与所述BCCH频点同步。
  9. 根据权利要求6或7所述的终端，其特征在于，所述终端未安装用户识别卡。
  10. 根据权利要求6或7所述的终端，其特征在于，所述终端为移动台MS或用户设备UE。
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